Weekly Information about Bright Comets (2021 Sept. 11: North)

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Updated on September 11, 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 9.0 mag (Sept. 7, 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)  
Sept.11   9 28.17   -5 56.7   1.808   1.049    29    8.6   4:13 (276, -2)  
Sept.18   9 51.42  -11 38.0   1.812   1.076    30    8.5   4:20 (282, -3)  

* 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)  
Sept.11  11 34.69   14 44.9   1.921   0.952    11   10.2  19:38 (114, -8)  
Sept.18  12  2.41   10 46.5   2.003   1.029    10   10.6  19:27 (109, -9)  

* 4P/Faye

Now it is 10.4 mag (Sept. 4, Marco Goiato). 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)  
Sept.11   5 16.03   18 17.5   1.292   1.619    88   10.4   4:13 (300, 62)  
Sept.18   5 33.17   17 42.5   1.248   1.622    91   10.4   4:20 (306, 64)  

* C/2019 L3 ( ATLAS )

Now it is 10.9 mag (Sept. 2, Martin Masek). It will brighten up to 10 mag in winter. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it is not observable until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11   7  9.38   44 44.4   3.997   3.720    66   11.1   4:13 (240, 48)  
Sept.18   7 17.35   44 10.9   3.893   3.702    71   11.0   4:20 (241, 53)  

* 67P/Churyumov-Gerasimenko

Now it is 12.1 mag (Sept. 1, Martin Masek). 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)  
Sept.11   3 37.57   15 57.9   0.625   1.372   112   11.5   4:13 (357, 71)  
Sept.18   4  4.21   17 57.1   0.574   1.334   112   11.1   4:16 (  0, 73)  

* 6P/d'Arrest

Now it is bright as 12.5 mag (Aug. 31, Chris Wyatt). It will brighten very rapidly, and it will be 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)  
Sept.11  17 36.64  -19 13.7   0.807   1.357    96   11.6  19:38 ( 23, 32)  
Sept.18  17 58.26  -22 29.0   0.832   1.355    94   11.2  19:27 ( 20, 30)  

* C/2020 T2 ( Palomar )

Now it is very bright as 10.9 mag (Sept. 8, Chris Wyatt). It will be fading after this. In the Northern Hemisphere, it will be getting lower gradually in the evening. In the Southern Hemisphere, it stays observable in good condition for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  15 36.68  -18 40.1   2.347   2.182    68   11.3  19:38 ( 50, 18)  
Sept.18  15 50.44  -20 41.0   2.442   2.212    64   11.5  19:27 ( 49, 16)  

* 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 13.5 mag (Sept. 4, Sandor Szabo). 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)  
Sept.11   7 21.14   26 56.4   1.461   1.299    60   11.7   4:13 (263, 41)  
Sept.18   7 39.32   26 48.0   1.479   1.360    63   12.2   4:20 (265, 44)  

* C/2017 K2 ( PanSTARRS )

Now it is 12.2 mag (Aug. 29, Toshihiko Ikemura, Hirohisa Sato). 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)  
Sept.11  16 56.70   30 32.8   5.398   5.376    83   12.0  19:38 ( 89, 64)  
Sept.18  16 57.15   29  5.2   5.409   5.316    79   11.9  19:27 ( 88, 60)  

* C/2019 T4 ( ATLAS )

Now it is 14.6 mag (July 12, 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 becomes extremely low temporarily from August to September. In the Northern Hemisphere, it is not observable until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  10 20.22  -23  4.5   5.631   4.795    30   13.5   4:13 (283,-22)  
Sept.18  10 28.08  -23 23.3   5.602   4.769    31   13.5   4:20 (287,-17)  

* 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 13.6 mag (Sept. 8, 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)  
Sept.11  23 34.09  -51 18.6   0.904   1.754   133   13.5   0:16 (  0,  4)  
Sept.18  23 27.03  -50 16.5   0.976   1.807   131   13.9  23:36 (  0,  5)  

* 29P/Schwassmann-Wachmann 1

Now it is visible visually at 14.4 mag (Sept. 7, Chris Wyatt).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11   4 54.85   31 25.5   5.787   5.912    92   13.6   4:13 (276, 72)  
Sept.18   4 56.43   31 36.1   5.680   5.914    98   13.6   4:20 (284, 79)  

* 19P/Borrelly

Now it is 15.0 mag (Sept. 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)  
Sept.11  23 58.87  -57 43.7   1.297   2.060   126   13.9   0:40 (  0, -3)  
Sept.18  23 48.89  -58 34.1   1.270   2.007   123   13.6   0:03 (  0, -3)  

* C/2020 J1 ( SONEAR )

Now it is 13.8 mag (Sept. 8, Chris Wyatt). It will be unobservable soon. However, 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)  
Sept.11  13 46.79   -3 57.0   4.352   3.619    38   13.6  19:38 ( 80,  7)  
Sept.18  13 49.26   -3 35.2   4.453   3.644    32   13.7  19:27 ( 82,  5)  

* 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)  
Sept.11  13 54.59   -5 59.9   1.890   1.307    40   13.7  19:38 ( 77,  8)  
Sept.18  14 20.07   -7 48.9   1.959   1.365    40   14.3  19:27 ( 74,  8)  

* C/2021 A1 ( Leonard )

Now it is 14.2 mag (Sept. 3, 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, although it becomes extremely low temporarily in September. 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)  
Sept.11  11  1.81   40  5.5   2.881   2.144    35   14.1   4:13 (226,  8)  
Sept.18  11  7.41   39 13.1   2.740   2.045    38   13.8   4:20 (230, 11)  

* 246P/NEAT

Now it is 14.5 mag (Aug. 10, 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)  
Sept.11  18 48.04  -35 25.6   2.544   3.057   111   14.5  19:38 (  3, 20)  
Sept.18  18 51.92  -35 16.3   2.645   3.069   105   14.6  19:27 (  5, 20)  

* C/2020 PV6 ( PanSTARRS )

Now it is 13.4 mag (Sept. 3, Sandor Szabo). It stays 14 mag until October, and it is observable in good condition. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  16 27.22   24 21.1   2.312   2.302    76   14.6  19:38 ( 83, 55)  
Sept.18  16 19.91   22 56.7   2.430   2.297    70   14.7  19:27 ( 85, 50)  

* 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 14.7 mag (Sept. 3, Michael Jager). 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)  
Sept.11   4 48.11    8 24.1   1.818   2.173    96   14.6   4:13 (323, 58)  
Sept.18   4 52.14    8  4.7   1.779   2.217   101   14.7   4:20 (336, 61)  

* C/2020 F5 ( MASTER )

Now it is 14.7 mag (Sept. 8, 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)  
Sept.11  22 53.40  -31 58.9   3.635   4.549   152   14.7  23:30 (  0, 23)  
Sept.18  22 47.21  -31 17.1   3.684   4.568   147   14.7  22:57 (  0, 24)  

* 17P/Holmes

Outburst occured in early August. Now it is 15.2 mag (Aug. 25, Thomas Lehmann). 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)  
Sept.11   5 30.14   43  7.6   2.466   2.570    84   14.8   4:13 (241, 66)  
Sept.18   5 38.69   43 51.8   2.410   2.598    89   14.9   4:20 (237, 70)  

* P/2021 Q5 ( ATLAS )

Bright new periodic comet. Now it is 14.7 mag (Sept. 3, Michael Jager). It stays observable in good condition for a long time. It stays 15 mag until November. Juan Jose Gonzalez reported it is very bright as 11.5 mag on Sept. 5.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11   7 37.42   19 46.4   1.496   1.241    55   14.8   4:13 (269, 35)  
Sept.18   8  1.85   17 42.8   1.495   1.253    56   14.9   4:20 (272, 35)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 14.9 mag (Sept. 8, Chris Wyatt). It was expected to brighten up to 13 mag from spring to summer. But actually, it is fainter than originally expected. It stays 14-15 mag until early autumn. 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)  
Sept.11  20 40.42  -84  8.2   3.370   3.668    99   15.0  21:22 (  0,-29)  
Sept.18  20 43.63  -82 48.5   3.420   3.681    97   15.0  20:57 (  0,-28)  

* C/2018 U1 ( Lemmon )

Now it is 15.2 mag (Sept. 8, Chris Wyatt). It stays at 14-15 mag for a long time from 2021 to 2022. It stays observable in good condition after this while brightening gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  16 20.70  -15 40.9   5.123   5.010    77   15.0  19:38 ( 44, 27)  
Sept.18  16 20.55  -16 36.4   5.238   5.006    71   15.1  19:27 ( 47, 24)  

* 108P/Ciffreo

Now it is 15.2 mag (Aug. 27, Toshihiko Ikemura, Hirohisa Sato). 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)  
Sept.11   5 27.79   22  2.4   1.399   1.660    85   15.2   4:13 (290, 62)  
Sept.18   5 44.56   23  8.2   1.349   1.662    88   15.2   4:20 (293, 66)  

* 284P/McNaught

Now it is 14.9 mag (Aug. 30, Toshihiko Ikemura, Hirohisa Sato). 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)  
Sept.11  23 12.50  -13 34.1   1.296   2.296   171   15.3  23:49 (  0, 41)  
Sept.18  23  9.15  -14 40.0   1.311   2.296   164   15.3  23:19 (  0, 40)  

* 132P/Helin-Roman-Alu 2

Now it is 15.7 mag (Sept. 3, Sandor Szabo). It will brighten very rapidly up to 14-15 mag, and it will be observable in excellent condition in autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11   0 25.16    2  9.9   0.819   1.802   161   15.6   1:06 (  0, 57)  
Sept.18   0 25.01    1 19.3   0.784   1.780   168   15.4   0:38 (  0, 56)  

* 106P/Schuster

Now it is 15.9 mag (Aug. 27, Toshihiko Ikemura, Hirohisa Sato). It stays 15 mag until September. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it will be getting lower gradually after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11   6 24.99   26 19.3   1.516   1.549    72   15.4   4:13 (271, 52)  
Sept.18   6 44.96   27 41.5   1.483   1.562    75   15.5   4:20 (271, 56)  

* 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)  
Sept.11  12 34.19   -0  6.1   3.271   2.350    19   15.7  19:38 ( 93, -5)  
Sept.18  12 46.33   -1 24.8   3.253   2.307    16   15.5  19:27 ( 93, -7)  

* 117P/Helin-Roman-Alu 1

Now it is 15.8 mag (Aug. 10, Thomas Lehmann). It will brighten up to 13 mag in 2022. In 2021, it is observable at 14-15 mag in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  14  1.23  -10 18.2   4.020   3.364    43   15.5  19:38 ( 73,  6)  
Sept.18  14  9.48  -11 13.4   4.071   3.350    39   15.5  19:27 ( 73,  4)  

* 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)  
Sept.11  12 12.30  -26  5.9   4.900   4.100    33   15.6  19:38 ( 74,-24)  
Sept.18  12 15.30  -27  4.1   4.896   4.059    30   15.5  19:27 ( 74,-27)  

* C/2020 M5 ( ATLAS )

Now it is 15.7 mag (Aug. 11, Thomas Lehmann). In the Northern Hemisphere, it stays observable at 15-16 mag for a long time from spring to early 2022. 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)  
Sept.11  12 41.81   35 32.9   3.760   3.012    36   15.6  19:38 (122, 16)  
Sept.18  12 45.71   33 26.0   3.788   3.018    34   15.6  19:27 (122, 13)  

* 57P/du Toit-Neujmin-Delporte

Now it is 16.6 mag (Aug. 28, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15.5 mag until autumn. It stays observable for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  16 35.74  -18 51.4   1.584   1.753    81   15.6  19:38 ( 38, 26)  
Sept.18  16 51.64  -19 29.0   1.629   1.742    78   15.6  19:27 ( 38, 26)  

* C/2021 A7 ( NEOWISE )

It brightened up to 14.2 mag in early summer (June 10, Thomas Lehmann). Now it is not observable. It will be fading after this. In the Northern Hemisphere, it will appear in the morning sky at 16 mag in October. In the Southern Hemisphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  11 21.94   21 27.7   3.033   2.090    16   15.6  19:38 (121, -6)  
Sept.18  11 36.70   22 21.8   3.032   2.120    20   15.7   4:20 (239, -4)  

* C/2019 U5 ( PanSTARRS )

Now it is 15.9 mag (Aug. 29, 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 locates extremely low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  16  6.57   40 42.3   6.241   6.036    73   15.7  19:38 (113, 55)  
Sept.18  16  5.70   39 34.4   6.254   5.993    70   15.6  19:27 (111, 52)  

* C/2020 R7 ( ATLAS )

Now it is 16.4 mag (Aug. 20, 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)  
Sept.11   3 50.41  -65 51.6   4.275   4.606   102   15.8   4:13 (358,-11)  
Sept.18   3 41.06  -68  9.3   4.232   4.559   102   15.7   3:53 (  0,-13)  

* 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)  
Sept.11  11 16.58   12 28.7   3.214   2.221     7   16.0   4:13 (244,-13)  
Sept.18  11 30.25   10 58.9   3.166   2.181     9   15.8   4:20 (249,-10)  

* 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 17.7 mag (July 4, Mount John Observatory, Lake Tekapo). In the Southern Hemisphere, it stays observable in excellent condition 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)  
Sept.11  10 52.08  -53 12.8   3.440   3.031    58   16.0   4:13 (314,-39)  
Sept.18  11  2.69  -52 35.8   3.527   3.067    55   16.1   4:20 (314,-35)  

* C/2020 O2 ( Amaral )

Now it is 15.9 mag (Aug. 24, ATLAS-HKO, Haleakala). It stays observable at 15-16 mag in good condition until autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  16 34.46  -10 34.6   4.926   4.863    80   16.0  19:38 ( 44, 33)  
Sept.18  16 37.10  -10  4.9   5.036   4.865    74   16.1  19:27 ( 48, 31)  

* 110P/Hartley 3

Now it is 16.7 mag (Aug. 29, Toshihiko Ikemura, Hirohisa Sato). It will brightens rapidly. And 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)  
Sept.11   7 10.56   26 37.1   2.764   2.467    62   16.2   4:13 (265, 43)  
Sept.18   7 22.62   26  1.5   2.684   2.463    66   16.1   4:20 (268, 47)  

* 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 15.4 mag (Aug. 20, 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)  
Sept.11   5 10.13  -65 26.8   3.552   3.774    94   16.1   4:13 (350,-12)  
Sept.18   4 57.75  -66 54.1   3.599   3.839    96   16.2   4:20 (355,-12)  

* C/2021 E3 ( ZTF )

Now it is 15.6 mag (Sept. 3, Sandor Szabo). 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)  
Sept.11  18 48.41   23 17.7   3.233   3.685   108   16.2  19:38 ( 14, 78)  
Sept.18  18 43.47   20 48.5   3.250   3.622   103   16.1  19:27 ( 30, 74)  

* C/2019 T3 ( ATLAS )

Now it is 16.4 mag (Aug. 30, Toshihiko Ikemura, Hirohisa Sato). 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)  
Sept.11  22  2.94   39 31.7   5.371   6.098   132   16.3  22:40 (180, 85)  
Sept.18  21 56.53   38  8.9   5.379   6.109   133   16.3  22:06 (180, 87)  

* 52P/Harrington-Abell

Now it is 17.3 mag (Aug. 29, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 16 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)  
Sept.11   8 42.54   24 28.2   2.409   1.792    41   16.5   4:13 (256, 24)  
Sept.18   9  1.56   23  1.1   2.363   1.785    44   16.4   4:20 (259, 26)  

* C/2021 D2 ( ZTF )

Now it is 17.5 mag (Aug. 20, ATLAS-MLO, Mauna Loa). 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)  
Sept.11  15 54.82   69  0.7   3.334   3.284    78   16.5  19:38 (157, 47)  
Sept.18  15 46.91   67 41.5   3.318   3.254    77   16.4  19:27 (154, 46)  

* C/2020 K1 ( PanSTARRS )

Now it is 16.4 mag (Aug. 30, 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)  
Sept.11  17 25.64   34 52.3   6.180   6.247    89   16.5  19:38 ( 96, 71)  
Sept.18  17 25.64   33 30.1   6.195   6.199    85   16.5  19:27 ( 94, 67)  

* 193P/LINEAR-NEAT

Now it is 16.3 mag (Sept. 1, ATLAS-HKO, Haleakala). It stays observable at 16.5 mag in good condition until October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  23 15.42    0 29.0   1.167   2.171   174   16.5  23:52 (  0, 56)  
Sept.18  23  9.70    0 45.6   1.176   2.175   171   16.5  23:19 (  0, 56)  

* 402P/2020 Q3 ( LINEAR )

First return of a new periodic comet observed at 16 mag from 2003 to 2004. Now it is 17.4 mag (Aug. 27, J. L. Virlichie, P. Traverse). 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)  
Sept.11   6 19.17    2  0.7   4.128   3.975    74   16.6   4:13 (301, 39)  
Sept.18   6 24.23    1 50.1   4.031   3.970    79   16.5   4:20 (308, 44)  

* C/2019 O3 ( Palomar )

Now it is 15.8 mag (Sept. 3, Sandor Szabo). It stays at 16-17 mag from 2020 to 2021. 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)  
Sept.11  18 23.87   50 19.1   8.707   8.886    96   16.6  19:38 (159, 73)  
Sept.18  18 21.85   49 55.3   8.748   8.891    94   16.6  19:27 (150, 72)  

* 119P/Parker-Hartley

Now it is 17.9 mag (Aug. 28, ATLAS-HKO, Haleakala). It will brighten up to 14.5 mag in 2022 winter. In 2021, it stays observable in good condition while the comet will be brightening gradually. It is fainter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  22 40.94  -17 47.7   2.190   3.171   164   16.7  23:18 (  0, 37)  
Sept.18  22 36.11  -18 18.4   2.195   3.145   157   16.7  22:46 (  0, 37)  

* C/2021 K1 ( ATLAS )

Now it is 15.7 mag (Aug. 29, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this, and it will be fainter than 18 mag in November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11   1 15.19  -10 28.3   1.874   2.792   150   16.7   1:56 (  0, 45)  
Sept.18   1 13.26  -11 28.5   1.877   2.822   155   16.8   1:27 (  0, 44)  

* C/2019 K7 ( Smith )

Now it is 16.9 mag (Aug. 29, 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)  
Sept.11  16 14.49   51 46.4   5.878   5.732    76   16.9  19:38 (132, 56)  
Sept.18  16 13.64   51  0.6   5.947   5.765    74   17.0  19:27 (130, 54)  

* C/2018 N2 ( ASASSN )

Now it is 17.4 mag (Aug. 29, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it stays observable for a long time while it is getting fainter slowly. In the Southern Hemisphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  13 49.90   46 54.2   7.242   6.693    53   17.0  19:38 (127, 33)  
Sept.18  13 53.87   45 57.6   7.304   6.741    52   17.0  19:27 (127, 30)  

* C/2020 U5 ( PanSTARRS )

Now it is 17.7 mag (Sept. 1, D. Buczynski). 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)  
Sept.11   8 25.03   51 32.7   4.692   4.259    58   17.1   4:13 (228, 37)  
Sept.18   8 33.43   52 49.2   4.575   4.231    63   17.1   4:20 (227, 41)  

* 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)  
Sept.11   8 39.64   43  9.6   0.448   0.810    51   17.5   4:13 (237, 32)  
Sept.18   8 36.64   60 13.9   0.470   0.937    68   17.1   4:20 (218, 41)  

* C/2020 S3 ( Erasmus )

It brightened up to 3 mag in December in the SOHO spacecraft images (Dec. 18, Hirohisa Sato). Now it is 17.0 mag (Aug. 29, ATLAS-HKO, Haleakala). 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)  
Sept.11  23 39.80   17 41.4   3.304   4.248   156   17.1   0:21 (  0, 73)  
Sept.18  23 33.62   16 54.0   3.364   4.326   161   17.2  23:43 (  0, 72)  

* 104P/Kowal 2

Now it is 18.4 mag (Aug. 30, Toshihiko Ikemura, Hirohisa Sato). It will brightens rapidly. And it is expected to be observable at 12-13 mag in good condition from December to February.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  22 11.51   -1 48.1   0.861   1.848   163   17.5  22:48 (  0, 53)  
Sept.18  22  2.77   -3  0.7   0.825   1.788   155   17.1  22:12 (  0, 52)  

* 241P/LINEAR

Now it is 17.3 mag (Aug. 28, Toshihiko Ikemura, Hirohisa Sato). 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)  
Sept.11   7 26.76   35 22.3   2.251   1.971    61   17.2   4:13 (252, 43)  
Sept.18   7 43.25   34 27.2   2.209   1.987    64   17.2   4:20 (254, 46)  

* P/2021 N2 ( Fuls )

Now it is 17.5 mag (Aug. 12, Michael Jager). It is observable at 17 mag in good condition in autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11   2 31.76   18 36.8   3.140   3.827   126   17.3   3:12 (  0, 74)  
Sept.18   2 31.53   18 21.8   3.062   3.824   133   17.3   2:45 (  0, 73)  

* 28P/Neujmin 1

Now it is 17.1 mag (Aug. 18, Toshiyuki Takahashi). 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)  
Sept.11   5 14.36   37 32.0   2.426   2.588    87   17.3   4:13 (255, 69)  
Sept.18   5 19.77   38 18.1   2.391   2.643    93   17.3   4:20 (252, 75)  

* C/2020 F7 ( Lemmon )

Now it is 17.7 mag (May 12, ATLAS-HKO, Haleakala). It brightened rapidly. It stays 17-18 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)  
Sept.11   8 59.47  -19 42.8   6.064   5.353    41   17.4   4:13 (291, -5)  
Sept.18   9  1.99  -20 59.6   6.008   5.349    45   17.4   4:20 (296,  0)  

* 70P/Kojima

Now it is 17.4 mag (Aug. 28, 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)  
Sept.11   8  9.61   18 16.7   2.594   2.055    47   17.6   4:13 (266, 27)  
Sept.18   8 25.73   17 36.6   2.530   2.044    50   17.5   4:20 (269, 30)  

* C/2020 U4 ( PanSTARRS )

It stays 17 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)  
Sept.11   5 34.67   32 40.4   5.594   5.573    83   17.7   4:13 (266, 65)  
Sept.18   5 31.52   32 59.0   5.449   5.559    91   17.6   4:20 (270, 72)  

* 395P/2020 H1 ( Catalina-NEAT )

Now it is 17.4 mag (Aug. 30, 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)  
Sept.11  19  4.93  -18 55.6   3.548   4.106   117   17.6  19:43 (  0, 36)  
Sept.18  19  6.30  -18 58.1   3.638   4.101   110   17.6  19:27 (  3, 36)  

* 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 (Aug. 13, ATLAS-MLO, Mauna Loa). In the Southern Hemisphere, it is observable at 17.5 mag in excellent condition in summer. It locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  19 40.39  -40 11.1   0.710   1.494   119   17.6  20:19 (  0, 15)  
Sept.18  19 49.24  -39 10.5   0.714   1.462   115   17.6  20:01 (  0, 16)  

* C/2017 Y2 ( PanSTARRS )

Now it is 16.1 mag (Aug. 17, ATLAS-MLO, Mauna Loa). It will be fading after this, and it will be fainter than 18 mag in October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  15  8.79  -23 31.6   5.619   5.242    63   17.6  19:38 ( 52, 10)  
Sept.18  15  9.21  -24  0.5   5.753   5.268    56   17.7  19:27 ( 54,  7)  

* 230P/LINEAR

Now it is 17.0 mag (Aug. 26, J. Drummond). 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)  
Sept.11  21 59.03  -31 51.2   1.449   2.360   147   17.7  22:36 (  0, 23)  
Sept.18  21 53.39  -32 31.2   1.454   2.318   140   17.7  22:03 (  0, 23)  

* C/2017 T2 ( PanSTARRS )

It had been observed as 8-9 mag for a long time in 2020. Now it is fading. It has already faded down to 18.3 mag (Aug. 19, J. Drummond). It will be observable in good condition after this in the Southern Hemisphere. It locates extremely low after this in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  16 13.48  -45  9.8   5.739   5.693    82   17.7  19:38 ( 28,  1)  
Sept.18  16 16.68  -45  8.1   5.902   5.754    76   17.8  19:27 ( 30,  0)  

* 422P/2021 L1 ( Christensen )

First return of a new periodic comet which brightened up to 17 mag in 2006. Now it is 16.3 mag (Aug. 19, J. Drummond). It stays 18 mag from 2021 to 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  21 40.92  -67 35.7   2.666   3.223   114   17.7  22:19 (  0,-12)  
Sept.18  21 35.07  -66 24.7   2.698   3.211   111   17.7  21:45 (  0,-11)  

* 378P/2019 E2 ( McNaught )

Now it is 18.2 mag (Aug. 28, 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)  
Sept.11  23 34.31  -28 52.5   3.002   3.940   155   17.7   0:16 (  0, 26)  
Sept.18  23 30.37  -29 14.2   3.042   3.961   152   17.7  23:40 (  0, 26)  

* C/2020 T4 ( PanSTARRS )

Now it is extremely faint as 20.5 mag (June 17, M. Jaeger, E. Prosperi, S. Prosperi). It was predicted to brighten up to 17.5 mag in 2021 summer. But actually, it is much fainter than predicted. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  14 11.79   45 22.8   2.741   2.327    55   17.9  19:38 (124, 36)  
Sept.18  14 23.65   41 33.5   2.806   2.356    53   18.0  19:27 (120, 34)  

* C/2021 O3 ( PanSTARRS )

Now it is 18.2 mag (Sept. 7, Katsumi Yoshimoto). 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)  
Sept.11  22 48.09   26  6.9   2.873   3.768   148   18.1  23:25 (  0, 81)  
Sept.18  22 39.93   25  3.9   2.785   3.683   149   17.9  22:49 (  0, 80)  

* 116P/Wild 4

Now it is 19.0 mag (Aug. 25, B. T. Bolin, Z. T. F. Collaboration). 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)  
Sept.11   8 15.85   22 51.1   3.557   2.966    47   18.1   4:13 (261, 28)  
Sept.18   8 26.35   22 20.6   3.458   2.941    51   17.9   4:20 (264, 33)  

* C/2017 U7 ( PanSTARRS )

Now it is 17.6 mag (Aug. 30, Toshihiko Ikemura, Hirohisa Sato). It will be fading slowly.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11  16 52.75  -10 44.1   8.066   8.041    85   17.9  19:38 ( 39, 35)  
Sept.18  16 52.17  -10 40.4   8.213   8.068    78   18.0  19:27 ( 44, 33)  

* 88P/Howell

It brightened up to 8.2 mag in 2020 autumn (Oct. 13, 2020, Chris Wyatt). Now it is 18.3 mag (Aug. 19, ATLAS-MLO, Mauna Loa). It is observable at 18 mag in 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11   5 12.16   23 20.1   3.118   3.262    89   17.9   4:13 (292, 65)  
Sept.18   5 14.80   23 28.4   3.049   3.298    95   18.0   4:20 (303, 71)  

* (248370) 2005 QN173

Now it is 18.2 mag (Sept. 8, Michael Jager). Main-belt asteroid, but it has a long tail of 10 arcmin (Sept. 4, Michael Jager). It stays observable in good condition until winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.11   0  1.00    0  6.4   1.462   2.455   167   19.2   0:42 (  0, 55)  
Sept.18  23 55.84   -0 27.4   1.461   2.465   176   19.0   0:10 (  0, 55)  

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