Weekly Information about Bright Comets (2021 Oct. 30: North)

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Updated on October 31, 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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* 67P/Churyumov-Gerasimenko

Now it is bright as 10.0 mag (Oct. 29, Osamu Miyazaki). 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. 30   7  9.02   26  9.9   0.424   1.211   110    9.3   4:36 (  0, 81)  
Nov.  6   7 36.57   26 32.5   0.419   1.212   111    9.2   4:36 (  0, 81)  

* 6P/d'Arrest

Now it is bright as 10.6 mag (Oct. 25, Chris Wyatt). 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. 30  20 36.47  -31 47.3   1.095   1.439    86    9.9  18:33 (  7, 23)  
Nov.  6  21  3.30  -31 30.5   1.158   1.467    85    9.8  18:27 (  6, 23)  

* 8P/Tuttle

It brightened very rapidly. Now it is very bright as 9.5 mag (Oct. 13, Marco Goiato). 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. 30  12 21.86  -39  7.4   2.067   1.390    35   10.0   4:53 (311,-11)  
Nov.  6  12 48.09  -42  6.5   2.134   1.456    36   10.5   4:59 (314,-11)  

* C/2019 L3 ( ATLAS )

Now it is 10.5 mag (Oct. 29, 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. 30   7 46.18   40 40.7   3.234   3.614   104   10.4   4:53 (214, 83)  
Nov.  6   7 47.14   40  3.3   3.127   3.603   110   10.3   4:47 (180, 85)  

* 4P/Faye

Now it is bright as 10.9 mag (Oct. 17, 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. 30   6 46.73   11 53.3   1.031   1.701   114   10.4   4:14 (  0, 67)  
Nov.  6   6 52.58   10 49.1   1.003   1.724   119   10.5   3:52 (  0, 66)  

* C/2021 A1 ( Leonard )

Now it is 11.0 mag (Oct. 29, 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. 30  11 48.59   35  2.3   1.628   1.422    60   11.1   4:53 (250, 37)  
Nov.  6  11 58.24   34 29.3   1.401   1.314    63   10.4   4:59 (253, 42)  

* 19P/Borrelly

Now it is 12.9 mag (Oct. 25, 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. It will be getting higher rapidly after this also in the Northren Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 30  23  4.12  -52 43.0   1.195   1.703   101   11.7  20:29 (  0,  3)  
Nov.  6  23  4.98  -50  7.1   1.190   1.656    98   11.4  20:02 (  0,  5)  

* C/2017 K2 ( PanSTARRS )

Now it is bright as 11.4 mag (Oct. 29, 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 is not observable until February. 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. 30  17 12.00   21  1.1   5.450   4.952    55   11.6  18:33 ( 91, 37)  
Nov.  6  17 16.09   19 51.9   5.443   4.891    51   11.6  18:27 ( 92, 33)  

* 57P/du Toit-Neujmin-Delporte

Major outburst occured on Oct. 17. Now it is very bright as 11.5 mag (Oct. 22, Marco Goiato). 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. 30  18 41.90  -20 55.0   1.924   1.724    63   11.9  18:33 ( 37, 24)  
Nov.  6  19  1.69  -20 38.7   1.978   1.730    60   12.0  18:27 ( 38, 24)  

* C/2020 T2 ( Palomar )

It brightened up to 9.5 mag in early summer (June 27, Marco Goiato). Now it is fading. It has already faded down to 13.4 mag (Oct. 25, Chris Wyatt). 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. 30  17 20.15  -29 25.9   3.031   2.434    45   12.0  18:33 ( 47,  6)  
Nov.  6  17 35.85  -30 21.4   3.128   2.478    41   12.3  18:27 ( 47,  5)  

* 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. 30  11 12.87  -25 54.3   5.276   4.623    44   13.1   4:53 (311,  9)  
Nov.  6  11 19.69  -26 22.8   5.197   4.601    48   13.0   4:59 (315, 12)  

* 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. 30  14  2.60   -7 52.0   2.563   1.581     6   13.0   4:53 (271,-12)  
Nov.  6  14 17.91  -10  5.1   2.651   1.677     8   13.4   4:59 (276, -9)  

* 29P/Schwassmann-Wachmann 1

Major outburst occured on Sept. 25, and it brightened up to 10.0 mag (Oct. 1, Toshihiko Ikemura, Hirohisa Sato). Now it is fading. But it is bright as 11.5 mag still now (Oct. 28, Osamu Miyazaki).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 30   4 52.71   32 15.6   5.132   5.926   139   13.3   2:21 (  0, 87)  
Nov.  6   4 49.99   32 16.3   5.071   5.928   147   13.3   1:50 (  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. 30  14  7.80   -1 38.3   4.775   3.810    12   13.9   4:53 (265,-10)  
Nov.  6  14 11.04   -1 15.1   4.779   3.840    16   13.9   4:59 (269, -3)  

* 132P/Helin-Roman-Alu 2

Now it is 13.7 mag (Oct. 25, Chris Wyatt). 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. 30   0 23.71   -3 32.9   0.776   1.698   147   14.0  21:48 (  0, 52)  
Nov.  6   0 26.85   -3 42.0   0.805   1.693   140   14.0  21:24 (  0, 51)  

* 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. 30  14  8.80   -9 36.6   3.046   2.057     4   14.3   4:53 (272,-14)  
Nov.  6  14 24.36  -10 57.9   2.997   2.017     6   14.1   4:59 (276,-11)  

* 9P/Tempel 1

It will brighten up to 12 mag from winter to spring. In the Northern Hemisphere, it is appearing in the morning sky. 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. 30  12 58.10    1  4.4   2.809   1.948    24   14.6   4:53 (273,  6)  
Nov.  6  13 13.92   -0 41.4   2.742   1.912    26   14.4   4:59 (277,  9)  

* 104P/Kowal 2

Now it is 17.3 mag (Oct. 24, E. Bryssinck). 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. 30  21 44.53   -9 29.7   0.767   1.436   108   15.1  19:10 (  0, 46)  
Nov.  6  21 50.23   -9 59.2   0.767   1.381   102   14.7  18:48 (  0, 45)  

* 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. 30   8 52.56   25 49.3   1.474   1.750    88   15.1   4:53 (291, 69)  
Nov.  6   8 58.58   25 54.3   1.458   1.816    93   15.5   4:59 (302, 74)  

* 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 became extremely low temporarily from September to October. In the Northern Hemisphere, it becomes observable temporarily in the extremely low sky in December. But it becomes unobservable again soon.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 30  12 35.34  -34 37.4   4.643   3.826    31   15.2   4:53 (305,-10)  
Nov.  6  12 38.55  -36 12.1   4.565   3.790    34   15.1   4:59 (310, -6)  

* C/2020 F5 ( MASTER )

Now it is 14.9 mag (Oct. 25, Chris Wyatt). It will be fading after this. 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. 30  22 24.53  -25 28.1   4.236   4.688   111   15.1  19:49 (  0, 30)  
Nov.  6  22 23.60  -24 20.8   4.359   4.711   104   15.2  19:21 (  0, 31)  

* 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. 30   7  5.73   29 27.3   1.096   1.732   111   15.2   4:33 (  0, 84)  
Nov.  6   7 14.09   30 38.8   1.062   1.753   117   15.2   4:14 (  0, 86)  

* C/2020 PV6 ( PanSTARRS )

Now it is 14.2 mag (Oct. 21, Giuseppe Pappa). 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. 30  16  6.43   17 36.8   2.977   2.326    41   15.2  18:33 ( 97, 22)  
Nov.  6  16  6.94   17 14.3   3.027   2.340    38   15.3  18:27 ( 99, 17)  

* 246P/NEAT

Now it is 15.3 mag (Oct. 25, Chris Wyatt). It will be fading slowly after this. It will be unobservable in December.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 30  19 33.58  -33 32.8   3.284   3.152    73   15.3  18:33 ( 20, 18)  
Nov.  6  19 42.73  -33  7.6   3.388   3.166    68   15.4  18:27 ( 23, 18)  

* 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 is not observable from November to January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 30  16 30.52  -21 48.3   5.799   4.993    32   15.3  18:33 ( 60,  3)  
Nov.  6  16 33.52  -22 37.6   5.859   4.993    26   15.3  18:27 ( 62, -1)  

* 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. 30   4 43.37    5 47.4   1.612   2.478   143   15.3   2:11 (  0, 61)  
Nov.  6   4 36.87    5 31.8   1.611   2.521   150   15.5   1:37 (  0, 61)  

* 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. 30  21 38.64  -72 37.4   3.773   3.781    82   15.4  19:05 (  0,-17)  
Nov.  6  21 49.18  -70 40.1   3.841   3.801    80   15.4  18:48 (  0,-15)  

* C/2020 R7 ( ATLAS )

Now it is 16.1 mag (Oct. 11, 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. 30   0 54.32  -76 28.4   4.179   4.279    89   15.4  22:15 (  0,-21)  
Nov.  6   0 16.18  -76  8.0   4.198   4.233    85   15.4  21:10 (  0,-21)  

* 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. 30  15  5.33  -16 35.8   4.239   3.275    12   15.4  18:33 ( 76,-10)  
Nov.  6  15 15.53  -17 25.8   4.243   3.263     7   15.4  18:27 ( 77,-13)  

* 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. 30   9 57.96    3 57.7   1.497   1.429    66   15.4   4:53 (303, 43)  
Nov.  6  10 12.51    1 45.7   1.491   1.471    69   15.5   4:59 (310, 45)  

* 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. 30   8 20.68   21 39.1   2.177   2.457    94   15.6   4:53 (315, 72)  
Nov.  6   8 27.25   20 52.4   2.093   2.458    99   15.5   4:59 (335, 75)  

* C/2019 U5 ( PanSTARRS )

Now it is 15.5 mag (Oct. 14, Ken-ichi Kadota). 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, although it becomes low temporarily in November. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 30  16 11.71   33 50.8   6.246   5.732    54   15.7  18:33 (112, 30)  
Nov.  6  16 14.02   33  8.7   6.222   5.689    53   15.6  18:27 (113, 26)  

* 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 became 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. 30  13  8.09   23 10.0   3.773   3.086    40   15.7   4:53 (253, 17)  
Nov.  6  13 11.16   21 49.3   3.737   3.102    44   15.7   4:59 (258, 22)  

* C/2021 E3 ( ZTF )

Now it is 15.4 mag (Oct. 26, R. Farfan). 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. 30  18 37.25    6 52.2   3.480   3.239    67   15.8  18:33 ( 60, 45)  
Nov.  6  18 39.41    4 53.8   3.521   3.175    61   15.8  18:27 ( 62, 40)  

* C/2020 V2 ( ZTF )

Now it is 15.7 mag (Oct. 25, D. Buczynski). 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. 30  12 43.56   34 13.8   6.544   5.996    52   15.9   4:53 (245, 27)  
Nov.  6  12 47.17   34 33.1   6.412   5.940    57   15.8   4:59 (248, 32)  

* 284P/McNaught

Now it is 14.8 mag (Oct. 3, Michael Jager). It will be fading rapidly after this. It will be fainter than 18 mag in February.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 30  23  5.83  -17 10.1   1.616   2.319   123   15.8  20:31 (  0, 38)  
Nov.  6  23  9.25  -16 52.5   1.693   2.326   117   16.0  20:07 (  0, 38)  

* 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. 30   0 56.36  -14 51.2   2.154   3.023   145   15.9  22:20 (  0, 40)  
Nov.  6   0 54.75  -14 48.7   2.241   3.059   139   16.1  21:51 (  0, 40)  

* 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. 30  22 55.88    2 25.8   1.455   2.220   129   16.0  20:21 (  0, 58)  
Nov.  6  22 58.37    2 52.5   1.531   2.232   122   16.1  19:56 (  0, 58)  

* 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. It is fainter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 30  15 43.23   62 25.2   3.152   3.101    77   16.1  18:33 (146, 34)  
Nov.  6  15 46.79   62 12.5   3.111   3.080    79   16.1  18:27 (147, 32)  

* 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. 30  13  9.87   28 14.4   2.947   2.351    44   16.1   4:53 (248, 19)  
Nov.  6  13 26.22   29 24.0   2.927   2.397    49   16.1   4:59 (249, 23)  

* 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 16.3 mag (Oct. 12, ATLAS-MLO, Mauna Loa). 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. 30  23 19.29  -39 16.1   1.538   2.130   112   16.1  20:44 (  0, 16)  
Nov.  6  23 22.88  -37 10.0   1.651   2.184   108   16.4  20:20 (  0, 18)  

* 402P/2020 Q3 ( LINEAR )

First return of a new periodic comet observed at 16 mag from 2003 to 2004. Now it is 16.7 mag (Oct. 25, 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. 30   6 41.13    0 47.4   3.446   3.947   113   16.1   4:08 (  0, 56)  
Nov.  6   6 41.26    0 43.2   3.358   3.944   119   16.1   3:41 (  0, 56)  

* C/2020 K1 ( PanSTARRS )

Now it is 16.1 mag (Oct. 14, ATLAS-MLO, Mauna Loa). 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 is not observable until February. 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. 30  17 37.27   25 51.3   6.295   5.907    62   16.3  18:33 ( 93, 44)  
Nov.  6  17 40.75   24 45.6   6.304   5.859    59   16.2  18:27 ( 95, 40)  

* 106P/Schuster

Now it is 16.0 mag (Oct. 16, Thomas Lehmann). 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. 30   8 30.45   34 59.1   1.305   1.708    95   16.3   4:53 (266, 77)  
Nov.  6   8 44.08   36 16.1   1.279   1.741    99   16.5   4:59 (259, 81)  

* 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. 30   9 25.86   63 26.6   3.873   4.077    94   16.5   4:53 (204, 56)  
Nov.  6   9 34.99   65 46.4   3.772   4.053    99   16.5   4:59 (198, 56)  

* 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. 30  21 32.89   28 45.2   5.726   6.183   113   16.6  18:57 (  0, 84)  
Nov.  6  21 31.57   27 15.0   5.826   6.197   107   16.6  18:29 (  0, 82)  

* 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. 30  11 47.83  -51 40.3   3.878   3.301    48   16.6   4:53 (325,-14)  
Nov.  6  11 52.48  -51 52.2   3.902   3.343    49   16.7   4:59 (328,-11)  

* 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. 30  10 44.32   12 22.4   2.095   1.793    58   16.7   4:53 (284, 40)  
Nov.  6  10 59.34   10 26.4   2.050   1.802    61   16.7   4:59 (290, 42)  

* 116P/Wild 4

Now it is 17.0 mag (Oct. 17, Ken-ichi Kadota). 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. 30   9 23.46   19  3.7   2.797   2.788    79   16.9   4:53 (294, 60)  
Nov.  6   9 31.58   18 32.7   2.680   2.763    84   16.7   4:59 (303, 64)  

* 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. 30   9 56.71   12 32.3   2.128   2.009    69   16.8   4:53 (294, 49)  
Nov.  6  10 10.53   11 38.1   2.060   2.009    73   16.7   4:59 (300, 52)  

* 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 17.6 mag (Oct. 18, J. Drummond). 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. 30   2 44.72  -70  1.5   4.002   4.225    96   16.7   0:13 (  0,-15)  
Nov.  6   2 21.87  -69 13.8   4.091   4.289    94   16.8  23:16 (  0,-14)  

* 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. 30   5 59.20   47 59.0   2.103   2.771   122   16.7   3:27 (180, 77)  
Nov.  6   5 56.30   48 31.5   2.067   2.801   129   16.9   2:57 (180, 76)  

* C/2019 O3 ( Palomar )

Now it is 16.3 mag (Oct. 21, ATLAS-HKO, Haleakala). 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. 30  18 22.00   47 40.6   9.008   8.925    82   16.8  18:33 (125, 57)  
Nov.  6  18 23.79   47 25.2   9.049   8.931    80   16.9  18:27 (124, 53)  

* 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. In the Southern Hemisphere, it stays observable in good condition for a while. It locates extremely low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 30  21 40.34  -56  9.8   2.992   3.150    89   16.9  19:06 (  0, -1)  
Nov.  6  21 46.10  -54 10.0   3.053   3.142    85   16.9  18:44 (  0,  1)  

* C/2020 F7 ( Lemmon )

Now it is 17.0 mag (Oct. 18, 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. 30   9  9.03  -29 57.3   5.556   5.333    72   16.9   4:53 (336, 21)  
Nov.  6   9  8.23  -31 37.0   5.472   5.332    76   16.9   4:59 (344, 21)  

* 254P/McNaught

Now it is 16.6 mag (Oct. 26, ATLAS-HKO, Haleakala). 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. 30   5  7.31  -15 39.0   3.048   3.749   128   16.9   2:35 (  0, 39)  
Nov.  6   5  4.07  -16  4.1   3.021   3.767   132   16.9   2:04 (  0, 39)  

* C/2021 O3 ( PanSTARRS )

Now it is 16.9 mag (Oct. 22, J.-G. Bosch, F. Kugel). 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. 30  22  0.53   15 19.1   2.562   3.155   118   17.0  19:25 (  0, 70)  
Nov.  6  21 57.44   13 31.5   2.565   3.063   110   16.9  18:54 (  0, 69)  

* 2010 OE101

Michael Jager detected its cometary activity on Sept. 25. It approached to Earth down to 0.35 a.u. in early October, and it brightened up to 16.2 mag (Oct. 3, Michael Jager). Now it is fading rapidly.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 30   0 49.55  -10 17.8   0.432   1.378   147   17.0  22:15 (  0, 45)  
Nov.  6   1  2.51  -12 54.9   0.475   1.396   141   17.3  22:00 (  0, 42)  

* 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. 30   2 16.85   15 18.3   2.805   3.798   178   17.0  23:41 (  0, 70)  
Nov.  6   2 13.46   14 39.1   2.812   3.798   172   17.0  23:10 (  0, 70)  

* C/2020 U4 ( PanSTARRS )

Now it is 17.4 mag (Oct. 11, J.-G. Bosch, F. Kugel). 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. 30   4 51.24   34 28.7   4.691   5.484   139   17.1   2:20 (  0, 90)  
Nov.  6   4 40.92   34 31.5   4.608   5.473   147   17.1   1:42 (  0, 90)  

* 28P/Neujmin 1

Now it is 16.3 mag (Oct. 24, J.-G. Bosch, F. Kugel). 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. 30   5 19.77   42 16.0   2.226   2.977   131   17.1   2:48 (180, 83)  
Nov.  6   5 14.18   42 40.5   2.220   3.032   138   17.1   2:15 (180, 82)  

* C/2021 P4 ( ATLAS )

Now it is 17.6 mag (Oct. 17, J.-G. Bosch, F. Kugel). 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. 30  23  5.89   62  5.3   3.229   3.837   121   17.4  20:29 (180, 63)  
Nov.  6  22 54.73   61 11.7   3.177   3.763   119   17.3  19:51 (180, 64)  

* 430P/2021 Q2 ( Scotti )

First return of a new periodic comet which brightened up to 17 mag in 2011. Now it is 16.8 mag (Oct. 10, Ken-ichi Kadota). 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. 30  10 52.32   11  4.2   1.905   1.588    56   17.4   4:53 (284, 38)  
Nov.  6  11 11.91    9 12.2   1.853   1.575    58   17.3   4:59 (289, 39)  

* 241P/LINEAR

Now it is 16.9 mag (Oct. 7, J.-G. Bosch, F. Kugel). 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. 30   8 57.27   27 51.3   1.921   2.126    87   17.3   4:53 (284, 69)  
Nov.  6   9  4.96   26 44.2   1.869   2.155    92   17.4   4:59 (296, 74)  

* 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. 30  21 50.81  -31 35.7   1.623   2.070   101   17.4  19:16 (  0, 24)  
Nov.  6  21 56.33  -30 46.2   1.661   2.030    96   17.4  18:54 (  0, 24)  

* C/2019 K7 ( Smith )

Now it is 16.6 mag (Oct. 17, J.-G. Bosch, F. Kugel). 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. 30  16 22.80   47 54.5   6.276   5.971    67   17.4  18:33 (127, 37)  
Nov.  6  16 25.94   47 42.6   6.314   6.006    67   17.5  18:27 (128, 34)  

* (3200) Phaethon

Now it is 18.7 mag (Oct. 14, Catalina Sky Survey). In the Northern Hemisphere, it stays observable at 17 mag in good condition from November to December. It locates low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 30   4 13.13   40 19.6   1.433   2.306   143   17.7   1:42 (180, 85)  
Nov.  6   3 55.93   40  3.4   1.364   2.284   151   17.5   0:57 (180, 85)  

* 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. 30  22 22.93  -18 49.7   2.446   2.990   113   17.5  19:48 (  0, 36)  
Nov.  6  22 24.39  -18 29.2   2.513   2.965   107   17.5  19:22 (  0, 37)  

* C/2020 S4 ( PanSTARRS )

Now it is 17.5 mag (Oct. 26, ATLAS-MLO, Mauna Loa). 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. 30   4 51.89    2 50.4   4.558   5.358   140   17.6   2:20 (  0, 58)  
Nov.  6   4 49.76    2 39.8   4.459   5.313   146   17.5   1:50 (  0, 58)  

* 274P/Tombaugh-Tenagra

Now it is 21.4 mag (Aug. 19, Pan-STARRS 1, Haleakala). In the Northern Hemisphere, it stays observable at 17 mag in good condition from November to March. It locates low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 30   6  6.07   20 37.2   2.012   2.707   125   17.8   3:34 (  0, 76)  
Nov.  6   6  6.85   21 11.0   1.922   2.687   131   17.7   3:07 (  0, 76)  

* 424P/2021 L5 ( La Sagra )

First return of a new periodic comet which brightened up to 17 mag in 2012. Now it is 18.4 mag (Oct. 26, Catalina Sky Survey). 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. 30  21 30.69  -26 48.2   0.781   1.363    99   17.9  18:57 (  0, 28)  
Nov.  6  21 51.85  -23 41.8   0.803   1.364    98   17.9  18:50 (  0, 32)  

* 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. 30  19 29.71  -18 40.6   4.225   4.078    74   17.9  18:33 ( 27, 32)  
Nov.  6  19 35.71  -18 30.9   4.320   4.075    69   17.9  18:27 ( 31, 30)  

* 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. 30  23 34.10   -2 49.5   1.715   2.529   136   20.0  20:59 (  0, 52)  
Nov.  6  23 34.07   -2 49.8   1.794   2.541   129   20.2  20:31 (  0, 52)  

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