Weekly Information about Bright Comets (2020 Dec. 12: North)

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 Updated on December 11, 2020
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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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* C/2020 S3 ( Erasmus )

It brightened up to 5.6 mag in early December (Dec. 9, Marco Goiato). Now it is not observable. It will appear in the morning sky again in April. But then it will be fainter than 15 mag. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  16 16.58  -22 47.4   1.277   0.399    13    5.5   5:28 (294, -6)  
Dec. 19  17 19.18  -20 44.1   1.392   0.434     7    6.1   5:32 (288,-11)

* C/2020 M3 ( ATLAS )

Now it is very bright as 8.5 mag (Dec. 9, Marco Goiato). In the Northern Hemisphere, it stays observable in excellent condition for a long time. In the Southern Hemisphere, it stays locating extremely low after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12   5 19.57   35 39.2   0.471   1.447   167    8.8  23:53 (180, 89)  
Dec. 19   5 16.36   40 13.2   0.532   1.498   161    9.2  23:23 (180, 84)

* 88P/Howell

Now it is 10.0 mag (Dec. 9, Chris Wyatt). It stays observable in the evening low sky while it will be getting fainter gradually, until early January in the Southern Hemisphere, or late February in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  21 15.87  -19 27.5   1.922   1.586    55   10.6  18:19 ( 39, 25)  
Dec. 19  21 37.41  -17 37.8   2.000   1.624    53   10.9  18:22 ( 42, 26)

* 141P/Machholz 2

It brightened very rapidly in early December. Now it is very bright as 13.5 mag (Dec. 7, Michael Jager). In addition, Michael Jager observed two more components of 17.5-18.0 mag. It stays observable for a long time in this apparition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  20 50.98   -9 30.5   0.802   0.811    52   12.0  18:19 ( 51, 30)  
Dec. 19  21 26.23   -9  7.6   0.728   0.809    53   11.6  18:22 ( 50, 31)

* 156P/Russell-LINEAR

Brightened rapidly. Now it is very bright as 10.3 mag (Dec. 9, Chris Wyatt). In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it will be extremely low after January. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12   0 24.13   15 51.4   0.650   1.362   111   11.7  18:59 (  0, 71)  
Dec. 19   0 39.39   19 57.2   0.700   1.381   109   12.6  18:47 (  0, 75)

* 398P/2020 P2 ( Boattini )

First return of a new periodic comet which brightened up to 13 mag in 2009. Now it is bright as 12.8 mag (Dec. 9, Chris Wyatt). It will brighten up to 12 mag and will be observable in excellent condition in winter. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12   4 29.14   -9 48.2   0.383   1.317   145   12.3  23:03 (  0, 45)  
Dec. 19   4 33.44   -7  2.4   0.376   1.309   144   12.2  22:40 (  0, 48)

* C/2019 N1 ( ATLAS )

It brightened up to 13.5 mag in summer (July 31, Ken-ichi Kadota). It is expected to brighten up to 12 mag from autumn to winter. In the Southern Hemisphere, it will appear in the morning sky in December, then it stays observable in good condition. In the Northern Hemisphere, it will be observable in the extremely low sky only from November to December. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  14  8.44  -28 21.4   2.300   1.710    42   12.4   5:28 (317, 11)  
Dec. 19  14 15.90  -32 58.2   2.229   1.720    47   12.4   5:32 (324, 11)

* (3200) Phaethon

It will approach to Sun down to 0.14 a.u. on Dec. 7, and will brighten up to 11 mag. But it is not observable at the high light. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  17 50.71  -20 34.8   1.154   0.227     8   12.9  18:19 ( 72, -9)  
Dec. 19  19  8.31  -14 38.4   1.166   0.429    20   14.8  18:22 ( 70,  3)

* 29P/Schwassmann-Wachmann 1

Now it is 13.8 mag (Dec. 9, Chris Wyatt). 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12   2 17.33   25 10.8   5.062   5.843   139   13.3  20:51 (  0, 80)  
Dec. 19   2 15.81   24 52.5   5.141   5.844   131   13.3  20:22 (  0, 80)

* C/2017 T2 ( PanSTARRS )

It had been observed as 8-9 mag for a long time in 2020. Now it is not observable. It will appear in the morning sky at 14.5 mag. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  16 28.35  -23 17.0   4.152   3.192    11   14.1   5:28 (292, -9)  
Dec. 19  16 36.76  -24 22.6   4.191   3.259    16   14.2   5:32 (296, -5)

* C/2019 L3 ( ATLAS )

Now it is 14.2 mag (Nov. 23, Thomas Lehmann). It will brighten up to 11 mag in winter 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 2021 November. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  23 58.03   59 37.9   4.475   4.971   114   14.1  18:33 (180, 65)  
Dec. 19   0  1.58   58 40.6   4.483   4.930   111   14.1  18:22 (176, 66)

* C/2017 K2 ( PanSTARRS )

Now it is 14.3 mag (Nov. 12, 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 summer to 2023 summer. In the Southern Hemisphere, it is not observable now. 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)  
Dec. 12  17 40.33   35 45.3   8.052   7.593    59   14.3  18:19 (121, 19)  
Dec. 19  17 44.66   35 27.5   8.001   7.539    58   14.3   5:32 (237, 16)

* 11P/Tempel-Swift-LINEAR

It approached to Earth down to 0.5 a.u. in November, and it brightened very rapidly. Now it is very bright as 14.5 mag (Nov. 21, Michael Jager). It is observable in excellent condition. But it seems to fade out very rapidly after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12   1 21.30    8 42.3   0.602   1.400   121   14.3  19:57 (  0, 64)  
Dec. 19   1 40.55    7 32.5   0.644   1.411   118   15.0  19:48 (  0, 63)

* 246P/NEAT

It stays 13-14 mag from 2020 to 2021. It is not observable until January. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  16 12.90  -16 55.7   3.823   2.891    16   14.3   5:28 (289, -2)  
Dec. 19  16 24.72  -17 42.2   3.789   2.886    20   14.3   5:32 (293,  1)

* C/2019 F1 ( ATLAS-Africano )

Now it is 14.8 mag (May 14, Toshiyuki Takahashi). It will brighten up to 13 mag in 2021. In the Southern Hemisphere, it becomes too low to observe temporarily from mid October to mid December. 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)  
Dec. 12  15 49.81  -42 47.1   4.848   3.993    26   14.4   5:28 (313,-13)  
Dec. 19  15 59.89  -44  4.4   4.785   3.967    30   14.4   5:32 (317,-11)

* 10P/Tempel 2

It will brighten up to 11.5 mag in spring. However, the condition is very bad in this apparition. It will appear in the morning low sky in March in the Southern Hemisphere, or in June in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  16 52.27  -16 43.0   2.724   1.757     8   15.3   5:28 (284,-10)  
Dec. 19  17 11.99  -17 31.8   2.677   1.718    10   15.0   5:32 (286, -8)

* C/2020 N1 ( PanSTARRS )

Now it is 16.1 mag (Nov. 18, Thomas Lehmann). It will brighten up to 13.5 mag from winter to spring in 2021. In the Northern Hemisphere, it stays observable in excellent condition. In the Southern Hemisphere, it stays extremely low until spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  23 37.53   38 30.9   1.300   1.857   107   15.3  18:19 (160, 86)  
Dec. 19  23 47.38   36 41.6   1.282   1.791   103   15.1  18:22 (109, 84)

* C/2020 F3 ( NEOWISE )

It approached to Sun down to 0.29 a.u. on July 3, and it brightened up to 0.6 mag (Alan Hale). Now it is fading. It has faded down to 11.3 mag in September (Sept. 27, Mitsunori Tsumura). Now it is not observable. It will appear in the morning sky at 16 mag. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  16 13.37  -21 38.2   3.932   2.991    14   15.1   5:28 (293, -5)  
Dec. 19  16 18.52  -22 12.5   3.984   3.083    20   15.3   5:32 (297,  0)

* C/2020 J1 ( SONEAR )

Now it is 14.9 mag (Oct. 10, Chris Wyatt). It will brighten up to 13.5 mag in spring. In the Southern Hemisphere, it stays observable in good condition for a long time, although it becomes unobservable temporarily in December. In the Northern Hemisphere, it is not observable until spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  17 31.87  -43 52.8   4.462   3.561    21   15.3  18:19 ( 53,-25)  
Dec. 19  17 35.22  -43 20.1   4.447   3.540    20   15.2   5:32 (307,-25)

* C/2020 F5 ( MASTER )

Now it is 15.0 mag (Nov. 15, Chris Wyatt). It stays 14-15 mag until 2021. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until June in 2021. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  20  3.68  -59 52.0   5.023   4.408    46   15.2  18:19 ( 25,-15)  
Dec. 19  20 17.61  -58 33.9   5.051   4.397    44   15.2  18:22 ( 28,-16)

* 17P/Holmes

Now it is 16.1 mag (Nov. 14, Martin Masek). It is observable only until mid December in the Southern Hemisphere, or mid January in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  20 31.72  -19 29.9   2.726   2.150    45   15.3  18:19 ( 48, 19)  
Dec. 19  20 45.67  -17 56.7   2.768   2.137    41   15.3  18:22 ( 52, 18)

* C/2018 N2 ( ASASSN )

Now it is 14.7 mag (Nov. 23, Thomas Lehmann). 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)  
Dec. 12  16  5.06   59 45.1   4.834   4.834    84   15.4   5:28 (217, 35)  
Dec. 19  16 11.80   59 43.6   4.858   4.880    85   15.4   5:32 (218, 39)

* C/2018 U1 ( Lemmon )

Now it is 15.9 mag (Nov. 10, Toshihiko Ikemura, Hirohisa Sato). It will stay at 14 mag for a long time from 2021 to 2022. In the Northern Hemisphere, it stays observable in good condition while brightening gradually, although it becomes unobservable temporarily in December. In the Southern Hemisphere, it is not observable until February. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  17 50.88    6 42.0   6.400   5.578    30   15.5  18:19 ( 95,  5)  
Dec. 19  17 54.31    6  4.0   6.390   5.555    29   15.5  18:22 ( 98, -1)

* C/2019 T4 ( ATLAS )

Now it is 15.5 mag (Nov. 12, Martin Masek). It is expected to brighten up to 13 mag in 2022. In 2020, it is observable in excellent condition in the Southern Hemisphere. In the Northern Hemisphere, it is observable from autumn to winter, but it locating extremely low. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12   8 32.06  -38 56.3   5.793   6.091   103   15.7   3:09 (  0, 16)  
Dec. 19   8 30.64  -39 30.4   5.699   6.053   106   15.6   2:40 (  0, 15)

* 405P/2020 U1 ( Lemmon )

First return of a new periodic comet which brightened up to 17 mag in 2013. Now it is 17.2 mag (Nov. 10, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 16 mag and will be observable in good condition in winter. In the Southern Hemisphere, it locates low until December. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  11 37.65   27 37.8   0.466   1.134    96   15.9   5:28 (304, 78)  
Dec. 19  12  7.70   23 22.6   0.466   1.124    94   15.9   5:32 (318, 75)

* C/2019 T2 ( Lemmon )

Now it is 16.3 mag (Nov. 9, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 14.5 mag from spring to summer in 2021. In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it is observable in good condition in 2020, however, it will be unobservable in 2021. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  21 19.02  -32 33.1   3.457   2.981    53   15.9  18:19 ( 31, 14)  
Dec. 19  21 22.66  -33 14.8   3.519   2.949    47   15.9  18:22 ( 35, 11)

* 162P/Siding Spring

Now it is 15.1 mag (Nov. 9, Toshihiko Ikemura, Hirohisa Sato). It stays 15-16 mag until winter. In the Northern Hemisphere, it stays observable in good condition for a long time after this. In the Southern Hemisphere, it will be getting lower after this, and it will be unobservable in January. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  22 54.35   -6 32.3   0.977   1.290    82   16.0  18:19 ( 18, 47)  
Dec. 19  23 10.11   -1  8.3   1.014   1.296    80   16.1  18:22 ( 26, 51)

* C/2019 K7 ( Smith )

Now it is 15.6 mag (Nov. 10, Toshihiko Ikemura, Hirohisa Sato). It stays 15-16 mag for a long time until 2021. In the Northern Hemisphere, it stays observable in good condition for a long time, although it becomes very low temporarily from December to January. In the Southern Hemisphere, it will be observable in the extremely low sky only in next spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  18 41.42   20 18.1   5.303   4.702    47   16.1  18:19 (100, 23)  
Dec. 19  18 44.95   20 50.1   5.344   4.719    46   16.1  18:22 (103, 18)

* C/2020 R4 ( ATLAS )

Now it is 17 mag (Nov. 19, Giuseppe Pappa). It will approach to Earth down to 0.46 a.u. in April, and it is expected to brighten up to 12.5 mag and to be observable in excellent condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  21 37.67  -20 57.7   1.898   1.643    59   16.5  18:19 ( 33, 27)  
Dec. 19  21 28.91  -20 17.0   1.982   1.563    51   16.4  18:22 ( 42, 22)

* C/2020 P1 ( NEOWISE )

It approached to Sun down to 0.34 a.u. on Oct. 20. Then the nucleus was disintegrated. After the perihelion passage, it was observed at 12.5 mag (Oct. 28, Michael Jager). Now only the remnant tail is visible. In the Northern Hemisphere, it stays observable while the comet will be fading rapidly. In the Southern Hemipshere, it will never be observable again. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  15 12.34    6 32.3   1.834   1.293    42   16.4   5:28 (279, 24)  
Dec. 19  15 21.91    6  7.6   1.908   1.419    46   16.9   5:32 (283, 28)

* C/2019 U6 ( Lemmon )

It brightened up to 6.0 mag in June (June 13, Marco Goiato). Now it is fading. It has already faded down to 15.5 mag (Nov. 18, Thomas Lehmann). In the Northern Hemisphere, it stays observable for a long time until it fades out. In the Southern Hemisphere, it will never be observable again. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  18 52.42   24 53.4   3.297   2.820    53   16.4  18:19 (103, 27)  
Dec. 19  19  5.11   25 26.1   3.399   2.903    52   16.7  18:22 (105, 24)

* C/2018 F4 ( PanSTARRS )

It brightened up to 13.5 mag in last winter (Dec. 6, 2019, Chris Wyatt). Now it is fading slowly. Now it is 16.5 mag (Nov. 23, Toshihiko Ikemura, Hirohisa Sato). In the Southern Hemisphere, it stays observable for a long time. It locates somewhat low in the Northern Hemisphere. Taras Prystavski found its fragmentation on Sept. 12. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12   1 19.53  -28 49.8   4.490   4.805   102   16.5  19:53 (  0, 26)  
Dec. 19   1 16.59  -27 21.5   4.625   4.847    97   16.6  19:23 (  0, 28)

* C/2019 T3 ( ATLAS )

Now it is 16.4 mag (Nov. 9, Toshihiko Ikemura, Hirohisa Sato). It is observable at 16.5-17 mag from 2020 to 2021. In the Southern Hemisphere, it is not observable until summer in 2021 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  22  5.82   54  9.9   5.743   5.974    98   16.5  18:19 (146, 64)  
Dec. 19  22  7.97   52 33.8   5.810   5.969    94   16.5  18:22 (138, 62)

* 84P/Giclas

Now it is 16.4 mag (Nov. 12, Toshihiko Ikemura, Hirohisa Sato). It stays 16 mag until winter, and 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)  
Dec. 12   8 42.12   18 40.3   1.628   2.402   132   16.6   3:19 (  0, 74)  
Dec. 19   8 39.22   19 15.6   1.603   2.440   140   16.7   2:49 (  0, 74)

* C/2017 B3 ( LINEAR )

It brightened up to 13.8 mag in autumn in 2019 (Sept. 3, 2019, Chris Wyatt). Now it is fading slowly. It has already faded down to 16.5 mag (Nov. 8, Toshihiko Ikemura, Hirohisa Sato). But it is still bright visually as 14.8 mag (Nov. 5, Sandor Szabo). 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  23 42.32    3 21.4   6.597   6.789    97   16.6  18:19 (  1, 58)  
Dec. 19  23 42.77    3 41.1   6.756   6.832    90   16.7  18:22 ( 15, 58)

* C/2019 O3 ( Palomar )

Now it is 16.6 mag (Nov. 9, 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. It is not observable in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  19  8.50   29 29.2   9.300   8.834    58   16.8  18:19 (105, 33)  
Dec. 19  19 11.24   29 39.2   9.333   8.831    56   16.8  18:22 (109, 27)

* 117P/Helin-Roman-Alu 1

Now it is 16.1 mag (Nov. 13, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 13 mag in 2022. In 2021, it is observable at 15-16 mag in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  13 13.12   -0 40.6   4.300   3.955    63   16.9   5:28 (310, 41)  
Dec. 19  13 18.78   -1 10.2   4.187   3.939    68   16.8   5:32 (317, 45)

* 409P/2020 V1 ( LONEOS-Hill )

First return of a new periodic comet which brightened up to 14-15 mag in 2006. Now it is 17.8 mag (Nov. 23, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 15-16 mag from February to March, and it will be observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  11  3.98    1 55.9   1.477   1.828    93   17.1   5:28 (354, 57)  
Dec. 19  11 19.05    1 38.2   1.397   1.808    97   16.9   5:28 (  0, 57)

* C/2019 C1 ( ATLAS )

It brightened up to 16.1 mag in last winter (Mar. 18, Toshihiko Ikemura, Hirohisa Sato). In 2021, it stays observable at 17 mag in good condition until summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  12 57.50  -19 38.4   7.180   6.743    60   17.1   5:28 (326, 28)  
Dec. 19  13  1.04  -19 52.4   7.092   6.753    66   17.0   5:32 (333, 30)

* 277P/LINEAR

Now it is 16.5 mag (Nov. 21, Michael Jager). It is observable in good 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)  
Dec. 12   2 17.51   32 48.5   1.053   1.911   139   17.1  20:52 (  0, 88)  
Dec. 19   2 21.93   30 59.0   1.088   1.907   133   17.1  20:29 (  0, 86)

* C/2020 M5 ( ATLAS )

Now it is 17.2 mag (Oct. 25, A. Mickleburgh). It stays 15-16 mag for a long time from 2021 spring to 2022 spring. It stays observable for a long time in the Northern Hemisphere. In the Southern Hemipsphere, it is not observable until the end of 2021. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  19 29.82   43 50.1   4.027   3.864    73   17.3  18:19 (121, 41)  
Dec. 19  19 32.63   43 37.1   4.026   3.824    71   17.3  18:22 (122, 36)

* 397P/2020 M2 ( Lemmon )

First return of a new periodic comet which brightened up to 17.5 mag in 2012. Now it is 17.2 mag (Nov. 13, D. Buczynski). It stays observable at 17 mag in good condition from summer to winter. It locates low in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12   4 44.83   38 45.5   1.634   2.591   162   17.3  23:18 (180, 86)  
Dec. 19   4 38.40   38 32.2   1.672   2.614   158   17.4  22:44 (180, 86)

* C/2020 T2 ( Palomar )

Now it is 17.5 mag (Nov. 12, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 14 mag from spring to summer, and it stays observable in good condition for a long time. In the Southern Hemisphere, it is not observable until late December. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  12 43.56   25 12.8   3.152   3.168    81   17.5   5:28 (285, 64)  
Dec. 19  12 53.13   25 13.0   3.015   3.112    86   17.3   5:32 (291, 68)

* 173P/Mueller 5

Now it is 16.8 mag (Dec. 7, Toshihiko Ikemura, Hirohisa Sato). It is observable at 17-18 mag for a long time from late 2019 to early 2021. It will fade out before it passes the perihelion. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12   5 44.63   17 37.7   3.516   4.493   171   17.4   0:22 (  0, 73)  
Dec. 19   5 40.30   17 51.9   3.503   4.483   174   17.4  23:46 (  0, 73)

* C/2020 H6 ( ATLAS )

It stays observable at 16-17 mag from 2021 to 2022. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  14  2.02  -28  5.6   5.902   5.238    43   17.5   5:28 (318, 12)  
Dec. 19  14  6.90  -27 59.2   5.798   5.214    49   17.5   5:32 (323, 16)

* C/2020 R7 ( ATLAS )

Now it is 17.9 mag (Nov. 19, Giuseppe Pappa). It is expected to brighten up to 12 mag in 2022. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until 2022. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12   3 23.56  -50 27.1   6.238   6.520   102   17.6  21:56 (  0,  5)  
Dec. 19   3 16.06  -50 23.0   6.244   6.470    98   17.6  21:21 (  0,  5)

* 178P/Hug-Bell

Now it is 17.0 mag (Nov. 9, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17-18 mag in good condition until winter. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12   7 53.17   20 25.5   1.386   2.256   143   17.7   2:30 (  0, 75)  
Dec. 19   7 49.10   21 19.3   1.371   2.287   151   17.8   1:59 (  0, 76)

* 257P/Catalina

Now it is 17.3 mag (Nov. 9, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this, and will be fainter than 18 mag in December. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  22 13.91   -0 51.7   2.297   2.255    75   17.8  18:19 ( 35, 49)  
Dec. 19  22 26.82   -0 40.1   2.390   2.272    71   18.0  18:22 ( 41, 47)

* C/2020 V2 ( ZTF )

Now it is 18.2 mag (Nov. 23, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 10 mag in 2023. In the Northern Hemisphere, it stays observable in good condition until 2023 autumn. In the Southern Hemipshere, it stays hardly observable for a while. But it becomes observable in good condition after 2023 summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 12  13 17.03   25 20.5   8.613   8.423    75   17.9   5:28 (277, 57)  
Dec. 19  13 18.38   25 48.0   8.457   8.372    81   17.9   5:32 (283, 64)

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