Weekly Information about Bright Comets (2021 Oct. 16: North)

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Updated on October 19, 2021
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Northern Hemisphere.
Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

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* 8P/Tuttle

It brightened very rapidly. Now it is very bright as 9.2 mag (Oct. 9, Chris Wyatt). It stays bright as 8-9 mag until October. The condition is bad in this apparition. In the Southern Hemisphere, it stays observable after this while the comet will be fading. But it stays locating low. It is not observable after this in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  11 29.90  -31 42.6   1.946   1.265    34    9.2   4:42 (303, -9)  
Oct. 23  11 55.74  -35 39.7   2.003   1.325    35    9.6   4:48 (307,-10)  

* 67P/Churyumov-Gerasimenko

Now it is bright as 10.1 mag (Oct. 13, Marco Goiato). It will brighten up to 9 mag, and will be observable in good condition in winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   6  7.23   24 33.6   0.447   1.230   110    9.8   4:29 (  0, 80)  
Oct. 23   6 38.90   25 31.4   0.433   1.217   110    9.6   4:33 (  0, 80)  

* 6P/d'Arrest

Now it is bright as 11.6 mag (Oct. 4, Carlos Labordena). It is observable at 10 mag in good condition from October to December. In the Northern Hemisphere, it locates somewhat low at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  19 41.27  -30 51.3   0.985   1.393    89   10.1  18:48 ( 10, 23)  
Oct. 23  20  8.99  -31 35.2   1.038   1.414    88    9.9  18:40 (  8, 23)  

* 4P/Faye

Now it is bright as 10.8 mag (Oct. 14, Osamu Miyazaki). It stays observable at 10-11 mag in excellent condition from summer to autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   6 28.94   14  4.7   1.094   1.663   105   10.3   4:42 (354, 69)  
Oct. 23   6 38.80   12 59.3   1.061   1.680   109   10.4   4:33 (  0, 68)  

* C/2019 L3 ( ATLAS )

Now it is 10.5 mag (Oct. 14, Osamu Miyazaki). It stays bright as 10 mag until spring for a long time. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it locates extremely low until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   7 40.67   41 52.6   3.454   3.639    92   10.6   4:42 (241, 73)  
Oct. 23   7 44.00   41 17.0   3.343   3.626    98   10.5   4:48 (234, 78)  

* C/2020 T2 ( Palomar )

It brightened up to 9.5 mag in early summer (June 27, Marco Goiato). Now it is fading. But it is bright as 11.4 mag still now (Oct. 4, Carlos Labordena). It will be unobservable soon in the Northern Hemisphere, or in November in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  16 49.19  -27  8.4   2.833   2.352    51   11.6  18:48 ( 47,  9)  
Oct. 23  17  4.58  -28 21.7   2.932   2.392    48   11.8  18:40 ( 47,  8)  

* C/2021 A1 ( Leonard )

Now it is 12.3 mag (Oct. 10, Michael Jager). It will approach to Earth down to 0.2 a.u. in December, and it is expected to brighten up to 4 mag. In the Northern Hemisphere, it stays observable in good condition for a long time until December while the comet is brightening gradually. In the Southern Hemisphere, it is not observable until mid December.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  11 32.84   36 13.8   2.048   1.635    51   12.2   4:42 (244, 28)  
Oct. 23  11 40.30   35 36.8   1.844   1.529    55   11.7   4:48 (247, 33)  

* C/2017 K2 ( PanSTARRS )

Now it is bright as 11.6 mag (Oct. 3, Osamu Miyazaki). It is expected to be observable at 5-6 mag for a long time from 2022 to 2023. In the Northern Hemisphere, it is not observable at the high light from 2022 autumn to 2023 summer. In the Southern Hemisphere, it stays low for a while. But it will be observable in good condition at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  17  5.04   23 30.9   5.448   5.074    63   11.7  18:48 ( 89, 45)  
Oct. 23  17  8.31   22 14.2   5.451   5.013    59   11.7  18:40 ( 90, 41)  

* 57P/du Toit-Neujmin-Delporte

Major outburst occured on Oct. 17. Now it is very bright as 11.9 mag (Oct. 17, Francois Kugel). It stays observable in the evening sky for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  18  3.06  -20 59.1   1.821   1.720    68   16.5  18:48 ( 37, 24)  
Oct. 23  18 22.32  -21  1.7   1.872   1.721    65   11.8  18:40 ( 37, 24)  

* 19P/Borrelly

Now it is 13.4 mag (Oct. 8, Chris Wyatt). It will brighten rapidly up to 9 mag in winter. It will be observable in good condition. In the Southern Hemisphere, it is observable in excellent condition. In the Northren Hemisphere, it is not observable until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  23 10.64  -56 40.6   1.210   1.802   109   12.3  21:30 (  0, -1)  
Oct. 23  23  5.98  -54 54.9   1.202   1.752   105   12.0  20:58 (  0,  0)  

* C/2021 O1 ( Nishimura )

It was observed at 9-10 mag from late July to early August. Now it is not observable. It will appear in the morning sky in December, but it will be fainter than 15 mag at that time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  13 28.85   -2 43.9   2.377   1.390     6   12.3  18:48 ( 96,-14)  
Oct. 23  13 46.30   -5 25.3   2.471   1.485     5   12.7   4:48 (267,-14)  

* C/2019 T4 ( ATLAS )

Now it is 13.8 mag (Oct. 9, Chris Wyatt). It is expected to brighten up to 11.5 mag in 2022. In the Southern Hemisphere, it stas observable in good condition for a long time, although it became extremely low temporarily from August to September. It is getting observable also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  10 58.57  -24 58.8   5.414   4.670    38   13.2   4:42 (302,  1)  
Oct. 23  11  5.82  -25 26.2   5.349   4.646    41   13.1   4:48 (306,  5)  

* 29P/Schwassmann-Wachmann 1

Major outburst occured on Sept. 25. Now it is very bright as 10.8 mag (Oct. 14, Osamu Miyazaki).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   4 56.48   32  8.3   5.286   5.922   125   13.4   3:19 (  0, 87)  
Oct. 23   4 54.89   32 12.9   5.204   5.924   132   13.4   2:50 (  0, 87)  

* C/2020 J1 ( SONEAR )

It brightened up to 12.3 mag from spring to summer (June 15, Marco Goiato). Now it is fading. It has already faded down to 13.8 mag (Sept. 8, Chris Wyatt). Now it is not observable. It will be observable again at 14 mag in November in the Northern Hemisphere, or in January in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  14  1.26   -2 19.1   4.723   3.751    11   13.8  18:48 ( 92, -7)  
Oct. 23  14  4.53   -1 59.4   4.756   3.780    10   13.9  18:40 ( 94,-10)  

* 132P/Helin-Roman-Alu 2

Now it is 13.1 mag (Oct. 8, Toshihiko Ikemura, Hirohisa Sato). It is observable at 14 mag in excellent condition in autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   0 21.52   -2 28.2   0.741   1.715   160   14.1  22:41 (  0, 53)  
Oct. 23   0 21.99   -3  7.8   0.754   1.705   153   14.0  22:14 (  0, 52)  

* 15P/Finlay

It brightened very rapidly up to 10.7 mag in July (July 20, Osamu Miyazaki). Now it is fading. It has already faded down to 15.9 mag (Oct. 8, Toshihiko Ikemura, Hirohisa Sato). It stays observable in the morning sky for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   8 35.03   25 57.8   1.496   1.618    78   14.2   4:42 (278, 60)  
Oct. 23   8 44.68   25 50.8   1.487   1.684    82   14.6   4:48 (283, 64)  

* 22P/Kopff

Now it is not observable. In the Southern Hemisphere, it will appear in the morning sky at 11 mag in late January, then it stays observable at 11 mag until June. In the Northern Hemisphere, it will appear in the morning sky in December, but it stays locating extremely low for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  13 39.35   -6 51.5   3.132   2.139     4   14.7  18:48 ( 91,-14)  
Oct. 23  13 53.81   -8 14.2   3.090   2.098     3   14.5  18:40 ( 91,-16)  

* 9P/Tempel 1

It will brighten up to 12 mag from winter to spring. Now it is not observable. In the Northern Hemisphere, it will appear in the morning sky at 14 mag in November. In the Southern Hemisphere, it is not observable until January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  12 27.57    4 31.5   2.938   2.024    19   15.0   4:42 (265,  1)  
Oct. 23  12 42.65    2 48.8   2.874   1.986    21   14.8   4:48 (269,  4)  

* C/2020 F5 ( MASTER )

Now it is 14.7 mag (Oct. 9, Chris Wyatt). It stays 14-15 mag until the end of 2021. In the Southern Hemisphere, it stays observable in good condition for a long time. It locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  22 28.85  -27 37.8   4.011   4.646   124   15.0  20:48 (  0, 28)  
Oct. 23  22 26.27  -26 34.0   4.120   4.667   117   15.1  20:18 (  0, 29)  

* C/2020 PV6 ( PanSTARRS )

Now it is 14.3 mag (Oct. 1, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this. In the Northern Hemisphere, it stays observable in good condition for a long time, although it becomes extremely low temporarily in November. In the Southern Hemisphere, it is not observable until late January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  16  7.02   18 47.9   2.837   2.306    48   15.0  18:48 ( 92, 31)  
Oct. 23  16  6.41   18  8.0   2.913   2.315    44   15.1  18:40 ( 94, 26)  

* 246P/NEAT

Now it is 14.9 mag (Oct. 6, Chris Wyatt). It stays 13-14 mag from 2020 to 2021. It will be observable in good condition after this in the Southern Hemisphere. It locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  19 16.82  -34 16.1   3.071   3.123    83   15.1  18:48 ( 15, 19)  
Oct. 23  19 24.92  -33 55.6   3.178   3.137    78   15.2  18:40 ( 18, 19)  

* 108P/Ciffreo

Now it is 14.3 mag (Oct. 4, Michael Jager). It stays 15 mag until November. It will be observable in excellent condition in the Northern Hemisphere. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   6 43.69   27 16.0   1.171   1.698   102   15.1   4:42 (325, 81)  
Oct. 23   6 55.51   28 20.0   1.132   1.714   107   15.1   4:48 (355, 83)  

* 10P/Tempel 2

It brightened up to 10.1 mag in spring (Apr. 10, Marco Goiato). Now it is fading. It has already faded down to 15.3 mag (Oct. 14, Sandor Szabo). It stays observable in good condition for a long time after this while the comet will fading.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   4 52.57    6 29.9   1.644   2.392   128   15.1   3:15 (  0, 62)  
Oct. 23   4 48.67    6  7.2   1.624   2.435   135   15.2   2:44 (  0, 61)  

* P/2021 Q5 ( ATLAS )

Bright new periodic comet. Now it is 14.5 mag (Oct. 8, Toshihiko Ikemura, Hirohisa Sato). It stays observable in good condition for a long time. It stays 14-15 mag until November. Juan Jose Gonzalez reported it is very bright as 11.8 mag on Oct. 7.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   9 24.88    8 32.8   1.500   1.354    61   15.2   4:42 (291, 40)  
Oct. 23   9 42.09    6 13.7   1.499   1.390    64   15.3   4:48 (297, 42)  

* C/2020 Y2 ( ATLAS )

Now it is 16.0 mag (Aug. 16, iTelescope Observatory, Siding Spring). It is expected to brighten up to 13 mag in 2022. In the Southern Hemisphere, it stays observable in good condition for a long time, although it becomes extremely low temporarily from September to October. In the Northern Hemisphere, it is not observable for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  12 28.59  -31 45.4   4.771   3.902    26   15.3   4:42 (296,-19)  
Oct. 23  12 32.00  -33  8.6   4.712   3.864    28   15.2   4:48 (301,-15)  

* C/2018 U1 ( Lemmon )

Now it is 15.9 mag (Oct. 8, Thomas Lehmann). It stays at 14-15 mag for a long time from 2021 to 2022. It will be unobservable from November to January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  16 25.47  -20  7.9   5.645   4.995    45   15.2  18:48 ( 56, 10)  
Oct. 23  16 27.82  -20 58.5   5.727   4.994    39   15.3  18:40 ( 58,  7)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 14.9 mag (Oct. 9, Chris Wyatt). It was expected to brighten up to 13 mag from spring to summer. But actually, it is fainter than originally expected. It will be fading slowly after this. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until July in 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  21 17.79  -76 21.4   3.645   3.744    87   15.2  19:40 (  0,-21)  
Oct. 23  21 28.15  -74 31.4   3.708   3.762    85   15.3  19:22 (  0,-19)  

* 7P/Pons-Winnecke

It brightened up to 9.7 mag in June (June 4, Michael Jager). Now it is fading. It has already faded down to 14.1 mag (Sept. 11, Chris Wyatt). In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it becomes extremely low after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  23 15.58  -43 24.8   1.327   2.022   120   15.4  21:35 (  0, 12)  
Oct. 23  23 16.79  -41 21.5   1.430   2.076   116   15.7  21:09 (  0, 14)  

* 104P/Kowal 2

Now it is 17.1 mag (Oct. 8, Thomas Lehmann). It will brightens rapidly. And it is expected to be observable at 12-13 mag in good condition from December to February. However, it is much fainter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  21 41.20   -7 52.7   0.770   1.550   122   15.7  20:01 (  0, 47)  
Oct. 23  21 41.52   -8 47.2   0.768   1.493   115   15.4  19:34 (  0, 46)  

* 117P/Helin-Roman-Alu 1

Now it is 15.8 mag (Oct. 4, Thomas Lehmann). Now it is not observable. It will appear in the morning sky at 15 mag in January. Then it will brighten up to 13 mag in 2022 summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  14 45.63  -14 51.6   4.210   3.299    20   15.5  18:48 ( 75, -5)  
Oct. 23  14 55.36  -15 44.4   4.228   3.287    16   15.4  18:40 ( 76, -7)  

* C/2020 R7 ( ATLAS )

Now it is 16.2 mag (Oct. 1, Thomas Lehmann). It will brighten up to 12.5 mag in 2022 summer. In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it is not observable until August in 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   2 11.61  -75 25.8   4.162   4.371    95   15.5   0:35 (  0,-20)  
Oct. 23   1 34.20  -76 14.6   4.167   4.325    92   15.5  23:22 (  0,-21)  

* 284P/McNaught

Now it is 14.8 mag (Oct. 3, Michael Jager). It stays 15 mag until October, and it is observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  23  2.53  -17 11.2   1.479   2.307   136   15.6  21:22 (  0, 38)  
Oct. 23  23  3.58  -17 16.7   1.544   2.313   129   15.7  20:56 (  0, 38)  

* 110P/Hartley 3

It brightened rapidly. Now it is 15.5 mag (Oct. 14, Sandor Szabo). It will be observable at 15 mag in excellent condition in winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   8  4.54   23 12.4   2.348   2.456    84   15.7   4:42 (290, 64)  
Oct. 23   8 13.08   22 26.0   2.263   2.456    89   15.6   4:48 (300, 68)  

* C/2021 K1 ( ATLAS )

Now it is 15.5 mag (Oct. 14, Sandor Szabo). It continues brightening even after the perihelion passage. It may stay 15-16 mag for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   1  1.40  -14 23.9   2.013   2.952   156   15.6  23:20 (  0, 41)  
Oct. 23   0 58.62  -14 43.1   2.077   2.987   151   15.8  22:50 (  0, 40)  

* C/2020 M5 ( ATLAS )

Now it is 15.9 mag (Sept. 24, D. Buczynski). In the Northern Hemisphere, it stays observable at 15-16 mag for a long time until early 2022, although it becomes extremely low temporarily from September to October. In the Southern Hemisphere, it is not observable until the end of 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  13  1.17   26  9.4   3.815   3.057    35   15.7   4:42 (243,  7)  
Oct. 23  13  4.74   24 36.7   3.799   3.071    37   15.7   4:48 (248, 12)  

* C/2019 U5 ( PanSTARRS )

Now it is 15.7 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 11 mag in 2023. In the Northern Hemisphere, it stays observable in good condition for a long time. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  16  7.97   35 29.7   6.271   5.818    58   15.7  18:48 (111, 38)  
Oct. 23  16  9.67   34 38.0   6.262   5.775    56   15.7  18:40 (111, 34)  

* C/2021 E3 ( ZTF )

Now it is 15.4 mag (Oct. 1, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 11 mag from spring to summer in 2022. In the Southen Hemisphere, it locates somewhat low in 2021, but it will be observable in good condition at the high light for a long time. In the Northern Hemisphere, it is observable in good condition in 2021, but it will not be observable at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  18 35.34   11  9.6   3.392   3.366    80   15.9  18:48 ( 54, 55)  
Oct. 23  18 35.87    8 57.5   3.436   3.302    73   15.9  18:40 ( 57, 50)  

* 193P/LINEAR-NEAT

Now it is 16.0 mag (Oct. 8, Toshihiko Ikemura, Hirohisa Sato). It stays observable in good condition for a long time. But it will be fading after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  22 55.14    1 44.1   1.325   2.201   142   15.9  21:15 (  0, 57)  
Oct. 23  22 54.79    2  3.1   1.386   2.210   135   16.0  20:47 (  0, 57)  

* C/2021 A7 ( NEOWISE )

It brightened up to 14.2 mag in early summer (June 10, Thomas Lehmann). Now it is fading. In the Northern Hemisphere, it is appearing in the morning sky. In the Southern Hemisphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  12 37.89   26  6.9   2.986   2.265    36   15.9   4:42 (246, 11)  
Oct. 23  12 53.76   27  8.9   2.967   2.307    40   16.0   4:48 (247, 15)  

* C/2020 V2 ( ZTF )

Now it is 16.6 mag (July 29, Thomas Lehmann). It is expected to brighten up to 10 mag in 2023. In the Northern Hemisphere, it stays observable in good condition until 2023 autumn, although it became extremely low temporarily in September. In the Southern Hemipshere, it stays unobservable until 2023 summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  12 36.16   33 51.6   6.782   6.106    44   16.0   4:42 (239, 16)  
Oct. 23  12 39.87   34  0.2   6.668   6.051    48   15.9   4:48 (243, 21)  

* 106P/Schuster

Now it is 16.0 mag (Oct. 1, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this, and it will be fainter than 18 mag in December. In the Northern Hemisphere, it stays observable in good condition for a long time. It locates extremely low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   7 59.10   32 34.8   1.361   1.649    87   16.0   4:42 (270, 69)  
Oct. 23   8 15.40   33 45.8   1.332   1.677    91   16.2   4:48 (269, 73)  

* C/2021 D2 ( ZTF )

Now it is 17.5 mag (Oct. 10, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15.5 mag in winter. In the Northern Hemisphere, it stays observable in good condition for a long time. It is not observable at all in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  15 38.73   63 29.7   3.223   3.147    76   16.2  18:48 (147, 39)  
Oct. 23  15 40.49   62 51.3   3.190   3.124    77   16.2  18:40 (146, 37)  

* 402P/2020 Q3 ( LINEAR )

First return of a new periodic comet observed at 16 mag from 2003 to 2004. Now it is 17.0 mag (Sept. 27, ATLAS-MLO, Mauna Loa). It will brighten up to 16 mag in winter, and it will be observable in excellent condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   6 38.41    1  4.2   3.635   3.953   101   16.3   4:42 (352, 56)  
Oct. 23   6 40.17    0 54.7   3.539   3.949   107   16.2   4:35 (  0, 56)  

* C/2020 O2 ( Amaral )

Now it is 15.8 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It will be unobservable in November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  16 52.21   -8 20.6   5.434   4.877    51   16.2  18:48 ( 60, 23)  
Oct. 23  16 56.91   -7 55.8   5.517   4.881    46   16.3  18:40 ( 63, 21)  

* C/2020 K1 ( PanSTARRS )

Now it is 16.2 mag (Oct. 1, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 11 mag in 2023. In the Northern Hemisphere, it is observable in good condition in 2021. But it is observable only until November in 2022. In the Southern Hemisphere, it locates extremely low in 2021. But it will be observable in good condition at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  17 31.46   28 13.6   6.266   6.004    70   16.3  18:48 ( 92, 52)  
Oct. 23  17 34.16   27  0.7   6.282   5.956    66   16.3  18:40 ( 93, 48)  

* 2010 OE101

Michael Jager detected its cometary activity on Sept. 25. Now it is bright as 16.2 mag (Oct. 3, Michael Jager). It approaches to Earth down to 0.35 a.u. in early October, and it is observable at 16 mag in excellent condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   0 22.74   -1 53.4   0.372   1.355   161   16.3  22:43 (  0, 53)  
Oct. 23   0 36.26   -6 36.7   0.397   1.364   154   16.6  22:29 (  0, 48)  

* 17P/Holmes

Outburst occured in early August, and it brightened up to 14.1 mag (Aug. 7, Michael Jager). Now it is fading. It has already faded down to 17.5 mag (Oct. 8, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemipsphere, it stays locating extremely low after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   5 59.20   46 42.2   2.194   2.712   110   16.4   4:22 (180, 78)  
Oct. 23   6  0.15   47 22.0   2.146   2.742   116   16.6   3:56 (180, 78)  

* C/2019 T3 ( ATLAS )

Now it is 16.2 mag (Oct. 7, Thomas Lehmann). It is observable at 16 mag from 2020 to 2021. It locates low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  21 37.73   31 54.5   5.557   6.157   122   16.5  19:57 (  0, 87)  
Oct. 23  21 34.94   30 18.7   5.636   6.170   118   16.5  19:27 (  0, 85)  

* C/2019 T2 ( Lemmon )

It was expected to brighten up to 14.5 mag from spring to summer. But actually, it is fainter than expected. Now it is 16.4 mag (Oct. 4, ATLAS-MLO, Mauna Loa). In the Southern Hemisphere, it stays observable for a long time. In the Northern Hemisphere, it is not observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  11 36.05  -51 32.0   3.798   3.219    48   16.5   4:42 (319,-21)  
Oct. 23  11 42.35  -51 33.4   3.843   3.260    47   16.6   4:48 (322,-17)  

* C/2019 N1 ( ATLAS )

It brightened up to 11.6 mag in winter (Feb. 18, Thomas Lehmann). Now it is fading. It has already faded down to 15.8 mag (Sept. 15, Thomas Lehmann). In the Southern Hemisphere, it stays observable in good condition after this. In the Northern Hemisphere, it will never be observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   3 35.35  -70 26.8   3.843   4.097    97   16.5   1:58 (  0,-15)  
Oct. 23   3  9.68  -70 26.4   3.919   4.161    97   16.6   1:05 (  0,-15)  

* C/2020 U5 ( PanSTARRS )

Now it is 17.0 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 16 mag in 2022. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it is not observable until 2023.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   9  7.99   59 16.6   4.095   4.125    84   16.7   4:42 (215, 54)  
Oct. 23   9 16.87   61 16.6   3.981   4.101    89   16.6   4:48 (210, 55)  

* 52P/Harrington-Abell

Now it is 16.6 mag (Oct. 8, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17 mag from autumn to winter. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it stays extremely low until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  10 12.41   16 10.4   2.184   1.780    53   16.7   4:42 (274, 35)  
Oct. 23  10 28.67   14 17.5   2.139   1.785    56   16.7   4:48 (279, 38)  

* C/2019 O3 ( Palomar )

Now it is 16.6 mag (Oct. 3, Toshihiko Ikemura, Hirohisa Sato). It stays at 16-17 mag from 2020 to 2021. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it is not observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  18 19.79   48 19.6   8.923   8.913    86   16.8  18:48 (129, 63)  
Oct. 23  18 20.66   47 58.9   8.966   8.919    84   16.8  18:40 (127, 60)  

* 422P/2021 L1 ( Christensen )

First return of a new periodic comet which brightened up to 17 mag in 2006. Now it is 17.4 mag (Sept. 27, N. Paul, E. Cortes). It stays 17 mag from 2021 to 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  21 32.11  -59 59.5   2.878   3.167    97   16.8  19:53 (  0, -5)  
Oct. 23  21 35.61  -58  6.6   2.934   3.158    93   16.8  19:29 (  0, -3)  

* 252P/LINEAR

It brightened up to 4 mag in major outburst in 2016. In this apparition, it brightened up to 10.5 mag in early August (Aug. 8, Rob Kaufman). Now it is fading rapidly. It has already faded down to 14.0 mag (Aug. 31, Chris Wyatt). In the Southern Hemisphere, it stays locating low in the evening sky until October. In the Northern Hemisphere, it stays locating extremely low.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  15 52.35  -13 12.3   2.293   1.610    36   16.9  18:48 ( 67,  9)  
Oct. 23  16 13.19  -14  5.5   2.386   1.672    35   17.5  18:40 ( 66,  9)  

* 254P/McNaught

Now it is 16.4 mag (Sept. 27, ATLAS-MLO, Mauna Loa). It continues brightening even after the perihelion passage. It stays observable at 17 mag in good condition for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   5 11.26  -14 31.2   3.127   3.713   118   16.9   3:34 (  0, 41)  
Oct. 23   5  9.73  -15  7.5   3.084   3.731   123   16.9   3:05 (  0, 40)  

* C/2020 F7 ( Lemmon )

Now it is 17.7 mag (May 12, ATLAS-HKO, Haleakala). It brightened rapidly. It stays 17 mag for a long time from 2021 to 2022. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it will be observable only in extremely low sky from autumn to winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   9  8.64  -26 44.9   5.721   5.336    62   17.0   4:42 (321, 16)  
Oct. 23   9  9.14  -28 19.8   5.639   5.335    67   16.9   4:48 (329, 19)  

* 70P/Kojima

Now it is 17.3 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15.5 mag, and will be observable in excellent condition in winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   9 27.74   14 21.1   2.264   2.014    62   17.1   4:42 (284, 43)  
Oct. 23   9 42.43   13 26.9   2.196   2.011    66   16.9   4:48 (289, 46)  

* P/2021 N2 ( Fuls )

Now it is 15.6 mag (Oct. 13, Sandor Szabo). It is observable at 16-17 mag in good condition in autumn. It is brighter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   2 23.49   16 33.3   2.835   3.801   163   17.1   0:47 (  0, 72)  
Oct. 23   2 20.26   15 56.8   2.813   3.799   171   17.0   0:16 (  0, 71)  

* 116P/Wild 4

Now it is 17.1 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It will brighten rapidly, and it will be observable at 13.5 mag in good condition from winter to spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   9  5.82   20  9.3   3.027   2.838    69   17.2   4:42 (281, 51)  
Oct. 23   9 14.86   19 36.1   2.913   2.813    74   17.1   4:48 (287, 55)  

* 28P/Neujmin 1

Now it is 16.7 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it stays observable in good condition after this while the comet will be fading. In the Southern Hemisphere, it stays locating extremely low for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   5 26.34   41  8.7   2.263   2.866   117   17.2   3:49 (180, 84)  
Oct. 23   5 23.86   41 44.9   2.241   2.921   124   17.2   3:19 (180, 83)  

* C/2021 O3 ( PanSTARRS )

Now it is 17.5 mag (Oct. 1, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 4.5 mag in 2022 April. However, it is not observable at the high light. In the Northern Hemisphere, it stays observable until early February when it brightens up to 14 mag. Then it will appear at 6 mag in mid May, and it stays observable in good condition after that while the comet will be fading. In the Southern Hemisphere, it stays observable until December when it brightens up to 16 mag. But after that, it is not observable until 2022 August.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  22 10.27   18 57.2   2.584   3.336   132   17.3  20:30 (  0, 74)  
Oct. 23  22  4.84   17  8.6   2.567   3.246   125   17.2  19:57 (  0, 72)  

* C/2020 U4 ( PanSTARRS )

Now it is 18.4 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It stays 17-18 mag for a long time from 2021 to 2022. It is observable in excellent condition in the Northern Hemisphere, It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   5  8.96   34  8.4   4.906   5.507   122   17.3   3:32 (  0, 89)  
Oct. 23   5  0.62   34 20.6   4.792   5.495   130   17.2   2:56 (  0, 89)  

* 241P/LINEAR

Now it is 17.2 mag (Sept. 20, Ken-ichi Kadota). In the Northern Hemisphere, it stays observable at 17 mag in good condition until winter. In the Southern Hemisphere, it stays locating extremely low for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   8 37.68   30  8.2   2.023   2.073    78   17.3   4:42 (270, 61)  
Oct. 23   8 48.15   28 59.5   1.973   2.099    83   17.3   4:48 (276, 65)  

* C/2019 K7 ( Smith )

Now it is 17.1 mag (Oct. 3, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. In the Northern Hemisphere, it stays observable in good condition for a long time. It is not observable after this in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  16 17.60   48 36.1   6.186   5.901    68   17.3  18:48 (127, 43)  
Oct. 23  16 20.00   48 12.4   6.234   5.936    68   17.4  18:40 (127, 40)  

* 230P/LINEAR

Now it is 18.4 mag (Oct. 10, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 16.5-17 mag in winter. In its last apparition in 2015, it brightened up to 13 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  21 44.76  -32 44.4   1.550   2.151   113   17.5  20:05 (  0, 22)  
Oct. 23  21 46.92  -32 15.4   1.586   2.110   107   17.4  19:40 (  0, 23)  

* C/2021 P4 ( ATLAS )

Now it is 17.6 mag (Oct. 10, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 11 mag in 2022 summer. In the Northern Hemisphere, it stays observable in good condition until 2022 June when it brightens up to 11 mag. But it is not observable after the high light. In the Souther Hemisphere, it is not observable until 2022 October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  23 32.98   63 11.6   3.362   3.982   122   17.6  21:51 (180, 62)  
Oct. 23  23 18.81   62 46.1   3.291   3.910   121   17.5  21:10 (180, 62)  

* 430P/2021 Q2 ( Scotti )

First return of a new periodic comet which brightened up to 17 mag in 2011. Now it is 17.2 mag (Sept. 16, Catalina Sky Survey). It stays observable at 17 mag in good condition until 2022 spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  10 12.65   14 35.1   2.016   1.621    52   17.6   4:42 (276, 34)  
Oct. 23  10 32.56   12 52.2   1.960   1.603    54   17.5   4:48 (280, 36)  

* 119P/Parker-Hartley

Now it is 17.1 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15 mag in 2022 winter. In 2021, it stays observable in good condition while the comet will be brightening gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  22 23.34  -19  9.9   2.329   3.041   127   17.5  20:43 (  0, 36)  
Oct. 23  22 22.58  -19  3.4   2.385   3.016   120   17.5  20:15 (  0, 36)  

* C/2020 S4 ( PanSTARRS )

Now it is 17.4 mag (Sept. 29, ATLAS-HKO, Haleakala). It will brighten up to 14 mag in early 2023. It stays observable in good condition for a long time until spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16   4 54.53    3 16.0   4.786   5.448   127   17.8   3:17 (  0, 58)  
Oct. 23   4 53.49    3  2.7   4.667   5.403   133   17.7   2:49 (  0, 58)  

* 2012 US136

Peculiar asteroid moving along a cometary orbit. It brightens up to 17 mag from September to October. In the Northern Hemisphere, it is observable in excellent condition. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  21 15.60   77 36.9   0.774   1.406   104   17.8  19:34 (180, 48)  
Oct. 23  21 20.13   71 47.5   0.878   1.514   107   18.1  19:12 (180, 53)  

* 424P/2021 L5 ( La Sagra )

First return of a new periodic comet which brightened up to 17 mag in 2012. Now it is 18.0 mag (Sept. 26, ATLAS-MLO, Mauna Loa). It is observable in excellent condition in the Southern Hemisphere. It locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  20 50.35  -32 10.7   0.748   1.376   103   17.8  19:12 (  0, 23)  
Oct. 23  21 10.07  -29 38.5   0.762   1.367   101   17.8  19:04 (  0, 26)  

* C/2020 S3 ( Erasmus )

It brightened up to 3 mag in December in the SOHO spacecraft images in 2020 December (Dec. 18, Hirohisa Sato). Now it is 17.6 mag (Oct. 1, Toshihiko Ikemura, Hirohisa Sato). It stays observable in good condition after this while the comet will be fading.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  23 13.61   13 26.8   3.757   4.631   147   17.8  21:33 (  0, 69)  
Oct. 23  23 10.31   12 38.1   3.891   4.706   141   17.9  21:02 (  0, 68)  

* 395P/2020 H1 ( Catalina-NEAT )

Now it is 17.4 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17-18 mag for a long time from 2021 to 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  19 19.29  -18 53.7   4.027   4.084    86   17.8  18:48 ( 19, 34)  
Oct. 23  19 24.22  -18 48.2   4.127   4.081    80   17.8  18:40 ( 23, 33)  

* 378P/2019 E2 ( McNaught )

Now it is 18.1 mag (Oct. 2, Toshihiko Ikemura, Hirohisa Sato). It has passed the perihelion in 2020 October. At the discovery in 2005, it stayed bright for several years even after the perihelion passage. In this apparition, it may stay observable at 18 mag from 2021 to 2024.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  23 17.83  -29 17.8   3.319   4.048   131   17.9  21:37 (  0, 26)  
Oct. 23  23 16.19  -28 59.0   3.414   4.070   125   17.9  21:08 (  0, 26)  

* 433P/(248370) 2005 QN173

Now it is 18.1 mag (Oct. 3, Michael Jager). Main-belt asteroid, but it has a long tail of 10 arcmin. It stays observable in good condition until winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 16  23 37.76   -2 25.5   1.585   2.506   151   19.7  21:57 (  0, 53)  
Oct. 23  23 35.34   -2 41.3   1.645   2.518   143   19.9  21:27 (  0, 52)  

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