Weekly Information about Bright Comets (2020 Oct. 24: South)

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Updated on October 27, 2020
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Southern Hemisphere.
Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

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* C/2020 M3 ( ATLAS )

It brightened rapidly. Now it is very bright as 8.5 mag (Oct. 24, Carlos Labordena). It stays observable at 8 mag in excellent condition from October to November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24   5  7.19  -19 22.7   0.412   1.268   123    8.1   2:57 (180, 75)  
Oct. 31   5 16.13  -12 49.9   0.385   1.271   129    8.0   2:38 (180, 68)  

* 88P/Howell

Now it is 8.6 mag (Oct. 20, Seiichi Yoshida). It stays bright as 8-9 mag until early November. It will be observable in excellent condition in the Southern Hemisphere. It locates very low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  18 16.98  -27 17.3   1.516   1.387    63    8.9  19:53 ( 83, 42)  
Oct. 31  18 44.80  -26 58.1   1.558   1.405    62    9.1  20:01 ( 82, 40)  

* C/2020 P1 ( NEOWISE )

Now it is very bright as 8.5-9.0 mag (Oct. 25, Giuseppe Pappa). In the Northern Hemisphere, appearing in the morning sky. It stasy observable after this 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)  
Oct. 24  13  3.77    4  6.2   0.829   0.360    20    9.2   3:36 (278,-18)  
Oct. 31  13 31.66    9  4.3   1.030   0.461    26   10.7   3:26 (275,-23)  

* C/2020 S3 ( Erasmus )

Now it is very bright as 9.9 mag (Oct. 25, Marco Goiato). It will approach to Sun down to 0.4 a.u. on Dec. 13, and it is expected to brighten up to 6 mag. It stays observable while the comet is brightening until late November when it brightens up to 7 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24   9 45.43   -3 21.4   1.316   1.224    62   10.5   3:36 (254, 27)  
Oct. 31  10 22.11   -7 19.1   1.201   1.097    59    9.8   3:26 (261, 25)  

* 156P/Russell-LINEAR

Brightened rapidly. Now it is very bright as 11.0 mag (Oct. 23, Marco Goiato). It is observable at 11-12 mag in excellent condition from October to November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  23 31.59  -20 53.2   0.481   1.364   132   11.9  21:19 (180, 75)  
Oct. 31  23 31.91  -15 36.3   0.484   1.349   128   11.4  20:52 (180, 70)  

* 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 14 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  15 29.34  -16 16.5   3.179   2.301    23   12.1  19:53 ( 72,  2)  
Oct. 31  15 36.33  -17 14.5   3.327   2.404    18   12.4  20:01 ( 67, -3)  

* C/2017 T2 ( PanSTARRS )

Now it is 11.2 mag (Sept. 11, Carlos Labordena). Now it is not observable. It will appear in the morning sky at 13.5 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  15 25.14  -13 41.1   3.621   2.726    22   12.3  19:53 ( 73,  0)  
Oct. 31  15 34.47  -15 19.3   3.721   2.792    17   12.5  20:01 ( 68, -4)  

* C/2019 N1 ( ATLAS )

It brightened up to 13.5 mag in summer (July 31, Ken-ichi Kadota). Now it is not observable. 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)  
Oct. 24  13 19.74   -1 20.4   2.731   1.779    13   12.9   3:36 (285,-18)  
Oct. 31  13 26.42   -4 49.2   2.685   1.755    16   12.9   3:26 (286,-14)  

* 29P/Schwassmann-Wachmann 1

Now it is 14.6 mag (Oct. 23, Toshihiko Ikemura, Hirohisa Sato).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24   2 38.67   27 15.4   4.881   5.832   161   13.2   0:30 (180, 28)  
Oct. 31   2 35.17   27  2.6   4.863   5.834   166   13.2  23:54 (180, 28)  

* 398P/2020 P2 ( Boattini )

First return of a new periodic comet which brightened up to 13 mag in 2009. Now it is 14.7 mag (Oct. 19, Thomas Lehmann). It is expected to brighten up to 12 mag and to be observable in excellent condition in winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24   4  3.87   -9 25.8   0.577   1.490   141   14.3   1:54 (180, 64)  
Oct. 31   4  9.59  -10 52.3   0.532   1.455   143   13.9   1:32 (180, 66)  

* C/2020 Q1 ( Borisov )

It brightened up to 11.3 mag in September (Sept. 12, Carlos Labordena). Now it is fading rapidly. It has already faded down to 16.6 mag (Oct. 11, Katsumi Yoshimoto). It stays observable in excellent condition in the Northern Hemipshere. It becomes observable in low sky from October to November also in the Southern Hemipshere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  19 53.22   26 42.5   1.250   1.664    94   14.2  19:53 (148, 21)  
Oct. 31  19 48.16   21 33.5   1.452   1.725    87   14.7  20:01 (137, 20)  

* 246P/NEAT

Now it is 15.3 mag (Sept. 12, SONEAR Observatory, Oliveira). 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)  
Oct. 24  14 53.44  -10  5.4   3.891   2.939    14   14.4  19:53 ( 71, -8)  
Oct. 31  15  4.29  -11 12.0   3.900   2.930    10   14.4  20:01 ( 66,-12)  

* 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 14.5 mag (Oct. 18, Toshihiko Ikemura, Hirohisa Sato). It stays observable in good condition for a long time after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  17 15.81   23  4.5   2.541   2.223    60   14.5  19:53 (119,  0)  
Oct. 31  17 30.45   23  9.1   2.652   2.310    59   14.8  20:01 (116, -4)  

* C/2017 K2 ( PanSTARRS )

Now it is 14.8 mag (Oct. 18, 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 only visible in the extremely low sky in summer in 2020. 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. 24  17 14.09   39 49.5   8.266   7.968    69   14.6  19:53 (132,-10)  
Oct. 31  17 17.14   39  3.3   8.249   7.915    67   14.6  20:01 (127,-15)  

* C/2019 L3 ( ATLAS )

Now it is 13.7 mag (Oct. 18, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 12 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)  
Oct. 24   0  8.26   65 14.2   4.647   5.262   123   14.7  21:55 (180,-10)  
Oct. 31   0  3.17   64 43.1   4.597   5.220   124   14.7  21:22 (180,-10)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 16.1 mag (Sept. 3, Blue Mountains Observatory, Leura). 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)  
Oct. 24  14 48.70  -34 35.5   5.070   4.198    25   14.8  19:53 ( 51,  6)  
Oct. 31  14 56.37  -35 40.2   5.063   4.167    22   14.7  20:01 ( 47,  2)  

* C/2018 N2 ( ASASSN )

Now it is 14.0 mag (Oct. 20, Toshihiko Ikemura, Hirohisa Sato). It stays 14 mag until autumn. 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. 24  15  5.30   64  2.5   4.635   4.516    76   15.0  19:53 (148,-37)  
Oct. 31  15 15.07   62 59.5   4.667   4.561    77   15.1  20:01 (146,-40)  

* C/2020 F5 ( MASTER )

Now it is 14.6 mag (Oct. 5, Taras Prystavski). 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)  
Oct. 24  18 13.68  -68 26.1   4.745   4.503    69   15.2  19:53 ( 26, 44)  
Oct. 31  18 30.65  -67 17.6   4.790   4.487    66   15.2  20:01 ( 28, 43)  

* C/2020 J1 ( SONEAR )

Now it is 15.5 mag (Oct. 19, Martin Masek). It will brighten up to 13.5 mag in spring in 2021. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until spring in 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  17 14.09  -49 42.6   4.204   3.736    55   15.3  19:53 ( 50, 37)  
Oct. 31  17 15.26  -48 36.7   4.274   3.708    49   15.3  20:01 ( 50, 31)  

* 84P/Giclas

Now it is 15.7 mag (Oct. 20, Giuseppe Pappa). It stays 15.5 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)  
Oct. 24   8 18.95   17 41.1   1.938   2.145    87   15.4   3:36 (221, 26)  
Oct. 31   8 26.54   17 32.1   1.889   2.180    93   15.4   3:26 (219, 28)  

* C/2020 K8 ( Catalina-ATLAS )

It brightened up to 14.2 mag in August (Aug. 18, Alan Hale). It approached to Sun down to 0.47 a.u. in September, and it was expected to brighten up to 11 mag. But actually, it was fainter than predicted. It is not observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  12 46.18   -6 50.8   1.916   1.013    17   15.5   3:36 (284, -8)  
Oct. 31  13  6.73   -7 14.9   2.021   1.136    19   16.1   3:26 (285, -8)  

* C/2018 U1 ( Lemmon )

Now it is 16.2 mag (Oct. 18, 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. In the Southern Hemisphere, it stays locating low for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  17 31.34   12 58.6   6.196   5.750    59   15.6  19:53 (113,  9)  
Oct. 31  17 33.34   11 52.8   6.249   5.724    54   15.6  20:01 (107,  4)  

* 17P/Holmes

Now it is 16.5 mag (Oct. 9, ATLAS-MLO, Mauna Loa). It brightens up to 15 mag in winter. But it is not observable at high light. In the Southern Hemisphere, it stays observable in good condition until autumn when the comet will brighten up to 16 mag. It stays locating very low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  19  0.52  -28 44.5   2.360   2.271    72   15.8  19:53 ( 86, 51)  
Oct. 31  19 12.44  -27 33.8   2.418   2.251    68   15.7  20:01 ( 85, 45)  

* 162P/Siding Spring

Now it is 16.2 mag (Oct. 8, Taras Prystavski). It stays 16 mag until winter. In the Southern Hemisphere, it is observable in excellent condition. It will be getting higher graually after this also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  21 15.92  -44 49.8   0.875   1.387    95   15.9  19:53 ( 41, 77)  
Oct. 31  21 28.14  -39 50.2   0.875   1.360    93   15.8  20:01 ( 68, 75)  

* C/2019 T2 ( Lemmon )

Now it is 16.2 mag (Oct. 11, 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)  
Oct. 24  21 21.48  -25  5.4   2.852   3.240   104   15.9  19:53 (133, 76)  
Oct. 31  21 17.59  -26 35.0   2.943   3.200    95   15.9  20:01 (109, 70)  

* 141P/Machholz 2

It will brighten very rapidly, and will brighten up to 11 mag from December to January. It stays observable for a long time. In the Southern Hemipshere, it locates low until the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  18  5.41  -10 35.2   1.237   1.159    61   16.5  19:53 ( 99, 31)  
Oct. 31  18 22.38  -10 41.1   1.196   1.088    58   15.9  20:01 ( 96, 27)  

* C/2019 K7 ( Smith )

Now it is 15.8 mag (Oct. 20, Toshihiko Ikemura, Hirohisa Sato). It stays 15-16 mag for a long time until 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  18 25.34   18 58.1   4.780   4.596    73   16.0  19:53 (127, 15)  
Oct. 31  18 26.27   18 56.1   4.876   4.609    68   16.1  20:01 (121,  9)  

* C/2019 T4 ( ATLAS )

Now it is 16.0 mag (Oct. 3, ATLAS-HKO, Haleakala). 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)  
Oct. 24   8 25.81  -33 30.5   6.508   6.360    77   16.1   3:36 (279, 57)  
Oct. 31   8 28.33  -34 20.6   6.404   6.321    80   16.0   3:26 (279, 60)  

* C/2018 F4 ( PanSTARRS )

It brightened up to 13.5 mag in winter (Dec. 6, Chris Wyatt). Now it is fading slowly. Now it is 14.9 mag (Oct. 8, Taras Prystavski). 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)  
Oct. 24   2  7.37  -36 59.0   3.805   4.523   131   16.0  23:53 (  0, 88)  
Oct. 31   1 58.01  -36 13.7   3.867   4.562   129   16.1  23:16 (  0, 89)  

* (3200) Phaethon

Now it is 18.6 mag (Aug. 6, Palomar Mountain--ZTF). 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. It is observable until November when it brightens up to 16 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24   9 29.97   17 56.4   0.867   1.095    71   16.3   3:36 (235, 15)  
Oct. 31  10 14.12   12 30.2   0.751   0.981    66   16.0   3:26 (243, 14)  

* C/2017 B3 ( LINEAR )

It brightened up to 13.8 mag in autumn in 2019 (Sept. 3, Chris Wyatt). Now it is fading slowly. Now it is 15.7 mag (Oct. 19, Thomas Lehmann). In 2020, it stays observable in good condition while the comet will be fading from 16 to 17 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  23 52.90    2  0.9   5.626   6.493   148   16.2  21:40 (180, 53)  
Oct. 31  23 49.92    2  6.8   5.737   6.535   140   16.3  21:09 (180, 53)  

* C/2017 U7 ( PanSTARRS )

Now it is 16.3 mag (Oct. 17, ATLAS-MLO, Mauna Loa). It is observable at 15-16 mag in 2020. It is observable in excellent condition in the Southern Hemisphere. It locates somewhat low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  17 59.51  -23 55.3   7.440   6.982    59   16.4  19:53 ( 84, 36)  
Oct. 31  18  0.29  -23 37.8   7.563   7.000    52   16.5  20:01 ( 80, 29)  

* C/2020 N1 ( PanSTARRS )

Now it is 16.8 mag (Oct. 20, Giuseppe Pappa). 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 2021 spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  23 38.31   49 47.1   1.564   2.355   132   16.7  21:25 (180,  5)  
Oct. 31  23 31.31   48 45.0   1.505   2.282   130   16.5  20:50 (180,  6)  

* C/2019 T3 ( ATLAS )

Now it is 16.4 mag (Oct. 20, 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)  
Oct. 24  22 21.28   67  1.0   5.534   6.016   114   16.5  20:08 (180,-12)  
Oct. 31  22 14.21   65 11.7   5.530   6.009   114   16.5  20:01 (177,-10)  

* C/2020 H4 ( Leonard )

It was expected to brighten very rapidly, and brighten up to 14.5 mag from August to September. However, its current brightness is very uncertain. It could not be detected as fainter than 18.0 mag on June 30 (Charles S. Morris), and fainter than 15.7 mag on July 13 (Sandor Szabo). However, Giuseppe Pappa reported as 14 mag on July 10, and Thomas Lehmann reported it is bright as 15.2 mag on July 12. In the Northern Hemisphere, it stays observable for a long time. It is getting higher gradually after this also in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  10 50.47    4 55.2   1.765   1.337    48   16.5   3:36 (258,  8)  
Oct. 31  10 49.44    0 29.3   1.743   1.418    54   16.7   3:26 (259, 15)  

* 115P/Maury

It brightened up to 14.6 mag in summer (July 18, Thomas Lehmann). Now it is 17.0 mag (Oct. 12, Toshihiko Ikemura, Hirohisa Sato). It stays observable until December when it becomes fainter than 18 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  20 21.59  -13 37.9   1.883   2.185    93   17.0  19:53 (126, 58)  
Oct. 31  20 33.40  -13 41.7   1.978   2.206    89   17.1  20:01 (119, 54)  

* 11P/Tempel-Swift-LINEAR

Now it is 16.3 mag (Oct. 18, Toshihiko Ikemura, Hirohisa Sato). It will approach to Earth down to 0.5 a.u. in November, and it is observable in excellent condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  23 40.01   25 26.8   0.502   1.436   145   17.1  21:28 (180, 30)  
Oct. 31  23 48.17   22 47.5   0.495   1.419   142   17.0  21:08 (180, 32)  

* 397P/2020 M2 ( Lemmon )

First return of a new periodic comet which brightened up to 17.5 mag in 2012. Now it is 16.8 mag (Oct. 11, ATLAS-MLO, Mauna Loa). It stays observable at 17 mag in good condition from summer to winter. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24   5 19.98   36  4.2   1.710   2.450   127   17.0   3:10 (180, 19)  
Oct. 31   5 18.82   36 48.6   1.668   2.468   134   17.0   2:42 (180, 18)  

* 257P/Catalina

Now it is 17.2 mag (Oct. 20, 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)  
Oct. 24  20 52.56    1 51.1   1.692   2.168   104   17.0  19:53 (152, 49)  
Oct. 31  21  2.60    0 58.2   1.770   2.177   100   17.1  20:01 (142, 47)  

* C/2020 R4 ( ATLAS )

Now it is 17.6 mag (Oct. 17, ATLAS-MLO, Mauna Loa). It will approach to Earth down to 0.46 a.u. in 2021 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)  
Oct. 24   0 10.39  -19 26.8   1.369   2.222   139   17.1  21:55 (180, 74)  
Oct. 31  23 37.71  -21  7.8   1.393   2.139   126   17.0  20:55 (180, 76)  

* C/2019 O3 ( Palomar )

Now it is 16.6 mag (Oct. 12, Toshihiko Ikemura, Hirohisa Sato). It stays at 17 mag from 2020 to 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  18 55.97   29 55.7   8.911   8.854    83   17.1  19:53 (139, 11)  
Oct. 31  18 56.81   29 43.4   8.979   8.851    79   17.1  20:01 (133,  6)  

* P/2020 U1 ( Lemmon )

First return of a new periodic comet which brightened up to 17 mag in 2013. Now it is 18.1 mag (Oct. 23, 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)  
Oct. 24   6 56.76   38 21.4   0.690   1.379   108   17.6   3:36 (194, 15)  
Oct. 31   7 33.78   39 18.3   0.629   1.330   108   17.2   3:26 (198, 13)  

* 304P/Ory

It brightened up to 15.0-15.5 mag in September (Sept. 19, Michael Jager). Now it is fading. It has already faded down to 17.3 mag (Oct. 20, Toshihiko Ikemura, Hirohisa Sato). It will be fainter than 18 mag in November. It is observable in good condition in the Northern Hemisphere. It locates low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24   8 55.25   18 59.6   1.327   1.512    79   17.3   3:36 (228, 20)  
Oct. 31   9  8.42   18 19.9   1.312   1.555    83   17.6   3:26 (227, 21)  

* 173P/Mueller 5

Now it is 17.8 mag (Oct. 11, ATLAS-MLO, Mauna Loa). 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)  
Oct. 24   6  2.63   16 35.6   3.986   4.563   119   17.4   3:36 (185, 38)  
Oct. 31   6  2.06   16 40.5   3.887   4.553   126   17.4   3:25 (180, 38)  

* (6478) Gault

Now it is 17.5 mag (Aug. 15, Toshihiko Ikemura, Hirohisa Sato). Main-belt asteroid. But it showed a straight tail like a comet in 2019. In 2020, it brightens up to 16.5 mag and stays observable in good condition from September to October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24   0  1.39   -5 39.4   1.441   2.338   146   17.4  21:48 (180, 61)  
Oct. 31  23 59.35   -6 51.4   1.512   2.353   138   17.6  21:19 (180, 62)  

* C/2016 M1 ( PanSTARRS )

It brightened up to 7.7 mag in June in 2018 (June 19, Juan Jose Gonzalez). Now it is fading. It has already faded down to 18.8 mag (Oct. 23, Toshihiko Ikemura, Hirohisa Sato).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24   6 36.88  -12 36.5   7.569   7.899   105   17.6   3:36 (210, 65)  
Oct. 31   6 34.98  -12 48.7   7.529   7.950   111   17.6   3:26 (200, 67)  

* 58P/Jackson-Neujmin

Recovered from SWAN images after 24-year blank. It brightened up to 10.2 mag in spring (May 31, Marco Goiato). Now it is fading very rapidly. It has already faded down to 18.3 mag (Oct. 12, Toshihiko Ikemura, Hirohisa Sato).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24   7 26.31    6 20.9   1.772   2.152    98   17.7   3:36 (215, 42)  
Oct. 31   7 29.13    5 44.6   1.741   2.204   104   18.0   3:26 (211, 45)  

* 277P/LINEAR

Now it is 17.8 mag (Oct. 20, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 17 mag in December. 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)  
Oct. 24   2 28.29   42 59.6   1.080   1.994   147   17.8   0:19 (180, 12)  
Oct. 31   2 24.63   42 23.5   1.046   1.977   151   17.7  23:44 (180, 13)  

* C/2019 E3 ( ATLAS )

Now it is 18.8 mag (Oct. 17, Slooh.com Chile Observatory, La Dehesa). It stays observable at 17-18 mag for a long time until 2027. In the Southern Hemipshere, it stays observable in good condition for a long time. It is not observable in the Northern Hemipsphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  10  6.40  -48 24.4  12.358  11.886    59   17.7   3:36 (307, 41)  
Oct. 31  10  7.27  -49  5.3  12.299  11.868    62   17.7   3:26 (307, 44)  

* 254P/McNaught

Now it is 18.1 mag (Oct. 9, ATLAS-MLO, Mauna Loa). It stays 18 mag until November. It is observable in excellent condition in the Southern Hemisphere. It locates very low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  23  1.95  -36 16.1   2.559   3.140   117   17.7  20:49 (  0, 89)  
Oct. 31  23  2.56  -36  0.2   2.641   3.142   111   17.8  20:22 (  0, 89)  

* C/2020 M5 ( ATLAS )

Now it is 17.1 mag (Oct. 9, D. Buczynski). 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)  
Oct. 24  19 32.41   49 23.1   3.950   4.162    95   17.8  19:53 (156, -1)  
Oct. 31  19 28.75   48 16.3   3.963   4.118    91   17.7  20:01 (150, -4)  

* 178P/Hug-Bell

Now it is 17.2 mag (Oct. 23, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17.5-18 mag in good condition until winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24   7 35.91   17 10.2   1.679   2.065    97   17.8   3:36 (211, 32)  
Oct. 31   7 43.09   17 19.2   1.626   2.089   103   17.8   3:26 (209, 33)  

* C/2018 A6 ( Gibbs )

It brightened up to 13.2 mag from spring to autumn in 2019 (June 30, Thomas Lehmann). Now it is fading slowly. It has already faded down to 16.9 mag (Oct. 12, Toshihiko Ikemura, Hirohisa Sato). In the Southern Hemisphere, it stays observable for a long time. In the Northern Hemisphere, it stays low for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  22 16.76  -26  3.5   4.409   4.912   114   17.8  20:04 (180, 81)  
Oct. 31  22 13.93  -25 10.7   4.555   4.953   108   17.9  20:01 (147, 78)  

* 215P/NEAT

Now it is 17.2 mag (Oct. 12, Toshihiko Ikemura, Hirohisa Sato). It was observed at 17 mag in 2019. In 2020, it is observable at 17.5 mag in good condition from summer to autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24   0 28.34   -7 57.0   2.907   3.807   150   17.8  22:15 (180, 63)  
Oct. 31   0 25.05   -7 55.2   2.969   3.815   143   17.9  21:44 (180, 63)  

* C/2020 R7 ( ATLAS )

Now it is 17.6 mag (Oct. 15, Blue Mountains Observatory, Leura). 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)  
Oct. 24   4 16.02  -46 38.9   6.409   6.868   113   17.9   2:06 (  0, 78)  
Oct. 31   4  9.77  -47 36.8   6.357   6.818   113   17.9   1:32 (  0, 77)  

* C/2019 NJ3 ( Lemmon )

Now it is 17.3 mag (Oct. 15, Slooh.com Chile Observatory, La Dehesa). In the Southern Hemisphere, it stays observable at 18 mg until winter. It is not observable in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  19  2.79  -85 45.4   4.470   4.362    77   17.9  19:53 (  4, 38)  
Oct. 31  19  0.20  -85 17.6   4.525   4.362    74   18.0  20:01 (  5, 38)  

* C/2020 P4 ( SOHO )

New comet discovered in the images of SOHO spacecraft. It approached to Sun down to 0.09 a.u. on Aug. 8, and it brightened up to 3 mag. Appearing in the morning sky, but it must be fainter than 18 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 24  11  9.34   -4 21.2   2.537   1.910    41   18.8   3:36 (268, 10)  
Oct. 31  11 14.55   -5  7.1   2.575   2.030    46   19.1   3:26 (267, 13)  

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Copyright(C) Seiichi Yoshida (comet@aerith.net). All rights reserved.