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

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Updated on September 16, 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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* 88P/Howell

Now it is 8.6 mag (Sept. 9, Michael Mattiazzo). It stays bright as 8-9 mag until autumn. 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)  
Sept.12  15 38.75  -22 38.4   1.363   1.363    68    9.0  19:36 ( 48, 15)  
Sept.19  16  2.70  -24  4.0   1.380   1.356    67    8.9  19:25 ( 45, 15)  

* 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 already faded down to 9.8 mag (Sept. 13, Katsumi Yoshimoto). It stays observable in the evening sky until early October when it fades down to 11 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  14 41.18   -7 18.2   2.058   1.629    51    9.7  19:36 ( 69, 15)  
Sept.19  14 50.38   -9 23.7   2.269   1.748    47   10.2  19:25 ( 69, 13)  

* C/2020 M3 ( ATLAS )

It brightened rapidly. Now it is very bright as 10.3 mag (Sept. 8, Chris Wyatt). It will brighten up to 9-10 mag from October to November, and will be observable in excellent condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   3 31.46  -35 59.7   0.671   1.422   114   11.2   4:06 (  0, 19)  
Sept.19   3 50.94  -35  8.5   0.619   1.379   114   10.9   3:58 (  0, 20)  

* C/2020 K8 ( Catalina-ATLAS )

Now it is 14.2 mag (Aug. 18, Alan Hale). Small comet. But it approaches to Sun down to 0.47 a.u. in September, and it was expected to brighten up to 11 mag. But actually, it is much fainter than this ephemeris recently. It will be unobservable soon.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   9 33.54    0 43.6   1.035   0.479    27   10.9   4:15 (270,  2)  
Sept.19  10 15.15   -1 57.5   1.213   0.487    23   11.3   4:21 (271, -1)  

* C/2017 T2 ( PanSTARRS )

Now it is 11.2 mag (Sept. 11, Carlos Labordena). It will be unobservable in early October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  14 27.98   -0 56.9   2.908   2.340    46   11.3  19:36 ( 76, 17)  
Sept.19  14 37.65   -3 29.6   3.036   2.403    43   11.5  19:25 ( 75, 14)  

* C/2020 Q1 ( Borisov )

Now it is 13 mag (Sept. 11, Giuseppe Pappa). It is very bright as 11.3 mag visually (Sept. 12, Carlos Labordena). It approaches to Earth down to 0.7 a.u. in September, and it will brighten up to 13 mag. It stays observable in excellent condition in the Northern Hemipshere. In the Southern Hemipshere, it is not obserbvable until early October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   4 22.66   55 37.8   0.868   1.381    94   13.1   4:15 (198, 68)  
Sept.19   2 43.58   65 54.1   0.764   1.416   105   12.9   2:58 (180, 59)  

* C/2020 P1 ( NEOWISE )

Now it is 14.6 mag (Sept. 9, Michael Mattiazzo). Although it is a tiny comet, it will approach to Sun down to 0.34 a.u. on Oct. 20, and it is expected to brighten up to 8.5 mag. In the Southern Hemisphere, it stays observable in good condition until late September when it brightens up to 11.5 mag. In the Northern Hemisphere, it stays unobservable for a while. But it will appear in the morning sky at 10 mag in late October. Then it stasy observable while the comet will be fading rapidly.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  12 28.18  -56 22.2   0.957   1.014    62   14.0  19:36 ( 41,-33)  
Sept.19  12 30.13  -52 17.8   0.888   0.874    54   13.2  19:25 ( 46,-34)  

* 29P/Schwassmann-Wachmann 1

Outburst occured on July 27. It is bright as 12.8 mag still now (Aug. 30, Ken Harikae).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   2 52.77   27 23.1   5.254   5.824   120   13.3   3:29 (  0, 82)  
Sept.19   2 51.64   27 30.0   5.167   5.825   126   13.3   3:00 (  0, 83)  

* C/2019 N1 ( ATLAS )

Now it is 14.0 mag (Aug. 20, Sandor Szabo). It is expected to brighten up to 12 mag from autumn to winter. It will be unobservable soon also in the Northern Hemisphere. 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)  
Sept.12  12 41.44   18 53.1   2.873   2.002    24   13.4  19:36 (108,  6)  
Sept.19  12 47.56   15 30.6   2.865   1.957    20   13.3  19:25 (107,  2)  

* 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 11.8 mag (Sept. 11, Carlos Labordena). 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)  
Sept.12  15 39.68   22 50.3   1.849   1.692    65   13.5  19:36 ( 89, 44)  
Sept.19  15 57.06   22 57.6   1.967   1.781    64   14.1  19:25 ( 89, 45)  

* 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 15.2 mag (Aug. 21, Sandor Szabo). It stays observable for a long time after this until the comet fades out.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   6 38.94   10 33.9   1.926   1.845    70   14.4   4:15 (290, 42)  
Sept.19   6 50.16    9 52.7   1.907   1.894    73   14.6   4:21 (295, 46)  

* 246P/NEAT

Now it is 14.2 mag (July 16, Paul Camilleri). It stays 13-14 mag from 2020 to 2021. It will be unobservable soon.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  13 53.51   -2 48.6   3.714   2.996    38   14.4  19:36 ( 80,  9)  
Sept.19  14  2.81   -4  4.6   3.758   2.985    34   14.4  19:25 ( 80,  6)  

* C/2018 N2 ( ASASSN )

Now it is 14.2 mag (Sept. 7, Thomas Lehmann). 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)  
Sept.12  13 53.33   73  2.2   4.446   4.255    72   14.7  19:36 (159, 37)  
Sept.19  14  7.78   71 15.3   4.476   4.298    73   14.7  19:25 (157, 37)  

* C/2017 K2 ( PanSTARRS )

Now it is 15.3 mag (Sept. 5, Thomas Lehmann). 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)  
Sept.12  17  4.29   45 13.2   8.328   8.285    84   14.8  19:36 (123, 65)  
Sept.19  17  4.73   44 16.2   8.320   8.232    81   14.8  19:25 (120, 63)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 15.9 mag (Aug. 14, ATLAS-MLO, Mauna Loa). It will brighten up to 13 mag in 2021. In the Southern Hemisphere, it stays observable at 15 mag until October. 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.12  14 11.22  -28 52.4   4.936   4.397    52   14.9  19:36 ( 57, -4)  
Sept.19  14 16.36  -29 43.7   4.978   4.363    47   14.9  19:25 ( 58, -6)  

* 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, although it becomes extremely low in early September. In the Southern Hemisphere, it is not observable until late October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  10 45.49   32 11.5   1.714   0.969    29   15.0   4:15 (235,  6)  
Sept.19  10 47.02   27 22.5   1.751   1.007    29   15.2   4:21 (243,  9)  

* C/2019 L3 ( ATLAS )

Now it is 15 mag (Sept. 11, Giuseppe Pappa). 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)  
Sept.12   0 44.75   65  1.0   5.107   5.519   109   15.2   1:21 (180, 60)  
Sept.19   0 39.51   65 26.8   5.014   5.476   112   15.1   0:48 (180, 59)  

* C/2020 F5 ( MASTER )

Now it is 15.0 mag (Aug. 28, 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)  
Sept.12  16 27.29  -74 34.4   4.490   4.610    90   15.2  19:36 ( 10,-22)  
Sept.19  16 45.11  -73 37.9   4.529   4.590    87   15.2  19:25 ( 11,-22)  

* C/2020 J1 ( SONEAR )

Now it is 14.5 mag (Aug. 18, T. Prystavski). 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)  
Sept.12  17 34.16  -58 34.7   3.696   3.918    95   15.3  19:36 ( 11, -5)  
Sept.19  17 25.94  -56 51.8   3.781   3.886    88   15.3  19:25 ( 15, -5)  

* 84P/Giclas

Now it is 15.5 mag (Aug. 18, Giuseppe Pappa). It stays 15.5 mag from summer to 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)  
Sept.12   7 10.82   19 10.2   2.195   1.951    62   15.4   4:15 (274, 41)  
Sept.19   7 24.50   18 56.5   2.158   1.981    66   15.4   4:21 (278, 45)  

* 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 (Aug. 28, Chris Wyatt). In the Southern Hemisphere, it stays observable for a long time. In the Northern Hemisphere, it is appearing in the morning sky, but it stays low for a while. Taras Prystavski found its fragmentation on Sept. 12.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   3  1.94  -37 39.2   3.706   4.295   119   15.6   3:38 (  0, 17)  
Sept.19   2 54.33  -37 55.8   3.694   4.332   123   15.7   3:02 (  0, 17)  

* C/2019 K7 ( Smith )

Now it is 15.7 mag (Sept. 5, Thomas Lehmann). 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)  
Sept.12  18 35.74   19 57.7   4.149   4.531   105   15.7  19:36 ( 24, 74)  
Sept.19  18 31.76   19 46.2   4.253   4.540   100   15.7  19:25 ( 38, 71)  

* 2P/Encke

It passed the perihelion on June 25, and brightened up to 7.3 mag (June 30, Chris Wyatt). Now it is fading. It has already faded down to 14.3 mag (Aug. 20, Ken-ichi Kadota). In the Southern Hemisphere, it stays observable in good condition in the evening sky while the comet will be fading. It locates very low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  16 48.76  -31 38.6   1.236   1.530    85   15.7  19:36 ( 29, 16)  
Sept.19  17 13.16  -31 15.0   1.386   1.620    83   16.3  19:25 ( 28, 18)  

* C/2020 F8 ( SWAN )

It brightened up to 4.7 mag in early May (May 2, Marco Goiato). However, it has faded and got diffused after that. It had already faded down to 7.3 mag in late May (May 21, Mitsunori Tsumura). It is appearing in the morning sky. However, maybe it has already disappeared. It stays observable in good condition after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   6 44.97   10  2.0   2.290   2.139    68   15.8   4:15 (289, 41)  
Sept.19   6 42.25    8  3.5   2.264   2.242    75   16.0   4:21 (299, 46)  

* 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. It will appear in the morning sky in October. But it must be fainter than 18 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  10 16.72    1 58.2   2.021   1.092    16   15.9   4:15 (263, -7)  
Sept.19  10 28.55    0 39.2   2.146   1.244    19   16.6   4:21 (267, -3)  

* C/2019 T2 ( Lemmon )

Now it is 15.7 mag (Sept. 11, Giuseppe Pappa). 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)  
Sept.12  22  9.12  -11 44.9   2.531   3.497   160   16.0  22:41 (  0, 43)  
Sept.19  21 59.07  -14 25.4   2.542   3.452   150   15.9  22:03 (  0, 40)  

* 162P/Siding Spring

Now it is 15.3 mag (Aug. 28, Chris Wyatt). It brightens up to 16 mag from summer to winter. In the Southern Hemisphere, it is observable in excellent condition. In the Northern Hemisphere, it is not observable until late October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  20 49.48  -66 45.1   0.935   1.612   112   16.0  21:22 (  0,-12)  
Sept.19  20 44.81  -64 13.5   0.919   1.569   109   16.0  20:51 (  0, -9)  

* 115P/Maury

Now it is 15.8 mag (Sept. 5, Thomas Lehmann). 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)  
Sept.12  19 24.82  -10 19.8   1.386   2.092   121   16.0  19:58 (  0, 45)  
Sept.19  19 31.98  -11 13.1   1.457   2.104   116   16.2  19:38 (  0, 44)  

* C/2018 U1 ( Lemmon )

Now it is 16.5 mag (Sept. 7, Thomas Lehmann). It will stay at 15 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)  
Sept.12  17 29.21   20 43.1   5.817   5.910    90   16.0  19:36 ( 61, 65)  
Sept.19  17 28.16   19 19.4   5.880   5.883    85   16.0  19:25 ( 65, 61)  

* C/2017 U7 ( PanSTARRS )

Now it is 16.2 mag (Aug. 15, Toshihiko Ikemura, Hirohisa Sato). 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)  
Sept.12  18  5.00  -25 55.5   6.601   6.877   101   16.1  19:36 ( 15, 28)  
Sept.19  18  2.64  -25 33.5   6.744   6.893    94   16.1  19:25 ( 20, 27)  

* 304P/Ory

Now it is 15.6 mag (Aug. 24, Katsumi Yoshimoto). It stays 16 mag until late September. 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)  
Sept.12   7  3.22   22 42.6   1.368   1.309    64   16.2   4:15 (271, 44)  
Sept.19   7 25.61   22 18.1   1.366   1.334    66   16.3   4:21 (274, 46)  

* 17P/Holmes

Now it is 17.2 mag (Aug. 17, P. Camilleri, H. Williams). 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)  
Sept.12  18  4.70  -35 37.5   2.001   2.409   101   16.4  19:36 ( 12, 18)  
Sept.19  18 11.54  -34 27.1   2.059   2.384    96   16.3  19:25 ( 15, 19)  

* C/2019 T4 ( ATLAS )

Now it is 15.9 mag (Apr. 24, J. Drummond). 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)  
Sept.12   8  2.42  -28 57.9   7.072   6.595    58   16.4   4:15 (307,  1)  
Sept.19   8  7.11  -29 37.9   6.987   6.556    60   16.4   4:21 (312,  5)  

* 156P/Russell-LINEAR

Now it is 16.7 mag (Aug. 30, ATLAS-MLO, Mauna Loa). It is expected to brighten up to 16 mag from October to November, and it will be observable in excellent condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   0  7.45  -37 46.1   0.601   1.537   144   16.6   0:44 (  0, 17)  
Sept.19   0  0.72  -36 58.4   0.564   1.500   144   16.4   0:10 (  0, 18)  

* 257P/Catalina

Now it is 16.4 mag (Aug. 20, Thomas Lehmann). It stays 16.5 mag until October, and observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  20 14.35   10  7.4   1.340   2.142   131   16.4  20:47 (  0, 65)  
Sept.19  20 17.51    8 31.0   1.383   2.143   127   16.5  20:23 (  0, 63)  

* 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 15.5 mag (Sept. 11, Giuseppe Pappa). 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)  
Sept.12   0 16.75    1 40.5   5.265   6.242   164   16.5   0:53 (  0, 57)  
Sept.19   0 12.51    1 44.0   5.286   6.284   172   16.6   0:21 (  0, 57)  

* C/2019 T3 ( ATLAS )

Now it is 16.5 mag (Sept. 11, Giuseppe Pappa). 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)  
Sept.12  23 56.54   74 21.6   5.791   6.068   101   16.7   0:34 (180, 51)  
Sept.19  23 35.18   73 44.7   5.724   6.058   104   16.6  23:38 (180, 51)  

* (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)  
Sept.12   0 30.80    5 44.7   1.273   2.246   159   16.9   1:07 (  0, 61)  
Sept.19   0 25.50    3 41.1   1.267   2.261   168   16.7   0:34 (  0, 59)  

* C/2017 Y2 ( PanSTARRS )

Now it is 16.0 mag (Aug. 20, Sandor Szabo). It is observable at 16.5-17 mag from spring in 2020 to summer in 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  17 21.00    7 38.4   4.552   4.652    89   16.8  19:36 ( 47, 54)  
Sept.19  17 18.62    6 10.5   4.661   4.647    82   16.8  19:25 ( 51, 50)  

* C/2019 O3 ( Palomar )

Now it is 16.9 mag (Aug. 26, Charles S. Morris). It stays at 17 mag from 2020 to 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  18 59.96   31 31.0   8.508   8.879   108   17.1  19:36 ( 13, 86)  
Sept.19  18 58.16   31 15.3   8.569   8.874   104   17.1  19:25 ( 53, 84)  

* 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 16.2 mag (Sept. 11, Giuseppe Pappa). 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)  
Sept.12  22 52.96  -30 13.3   3.747   4.667   153   17.1  23:25 (  0, 25)  
Sept.19  22 44.88  -29 44.0   3.824   4.708   148   17.2  22:49 (  0, 25)  

* P/2020 M2 ( Lemmon )

First return of a new periodic comet which brightened up to 17.5 mag in 2012. Now it is 17.5 mag (Aug. 15, Toshihiko Ikemura, Hirohisa Sato). 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)  
Sept.12   4 53.58   31  1.2   2.068   2.357    93   17.2   4:15 (279, 74)  
Sept.19   5  1.34   31 54.0   2.001   2.371    98   17.1   4:21 (283, 79)  

* 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 16.9 mag (Apr. 22, J. Drummond). In the Southern Hemisphere, it stays observable for a long time until the comet will fade out. It will be observable in good condition after this also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   6 39.01  -11  5.2   7.843   7.589    71   17.5   4:15 (309, 27)  
Sept.19   6 39.73  -11 20.3   7.801   7.641    77   17.5   4:21 (316, 32)  

* 312P/NEAT

Now it is 18.5 mag (Aug. 27, ATLAS-MLO, Mauna Loa). It will brighten up to 17.5 mag in September. 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)  
Sept.12  23 15.31  -20 41.6   1.000   1.986   163   17.5  23:47 (  0, 34)  
Sept.19  23 13.34  -22 36.5   1.018   1.984   157   17.5  23:18 (  0, 32)  

* 254P/McNaught

Now it is 17.3 mag (Aug. 16, W. Hasubick). It stays 17.5 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)  
Sept.12  23 16.82  -33 35.4   2.223   3.138   150   17.5  23:49 (  0, 21)  
Sept.19  23 12.89  -34 36.0   2.254   3.138   145   17.5  23:17 (  0, 20)  

* 278P/McNaught

Now it is 17.3 mag (Aug. 22, ATLAS-MLO, Mauna Loa). It became brighter than orignally predicted. It will be fading after this, and will be fainter than 18 mag in October. It locates extremely low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  14 59.17  -22  6.0   2.411   2.087    59   17.5  19:36 ( 55,  9)  
Sept.19  15 14.46  -23  7.5   2.471   2.088    56   17.6  19:25 ( 54,  8)  

* 28P/Neujmin 1

Now it is 16.9 mag (Aug. 24, P. Camilleri, H. Williams). It will brighten up to 15.5 mag in early 2021. In 2020, it stays observable at 17 mag until November in the Southern Hemisphere. In the Northern Hemisphere, it will be unobservable soon. Then it stays unobservable until 2021 June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  14 53.28  -29 42.7   2.902   2.570    61   17.6  19:36 ( 50,  3)  
Sept.19  15  4.20  -30  5.4   2.922   2.515    56   17.5  19:25 ( 51,  1)  

* 173P/Mueller 5

Now it is 18.6 mag (Aug. 24, 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)  
Sept.12   5 51.06   16 19.5   4.667   4.629    81   17.7   4:15 (294, 55)  
Sept.19   5 54.59   16 21.9   4.550   4.618    87   17.6   4:21 (303, 61)  

* 277P/LINEAR

Now it is 20.3 mag (Aug. 21, J. Nicolas, F. Kugel). It is expected to brighten up to 16 mag from autumn to winter. 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.12   2 25.64   39 54.7   1.450   2.128   118   17.9   3:01 (180, 85)  
Sept.19   2 29.65   41  0.3   1.372   2.102   123   17.6   2:38 (180, 84)  

* 215P/NEAT

Now it is 17.7 mag (Aug. 15, 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)  
Sept.12   0 53.56   -6 30.1   2.818   3.764   156   17.6   1:30 (  0, 49)  
Sept.19   0 49.63   -6 52.0   2.798   3.771   163   17.6   0:58 (  0, 48)  

* P/2002 T5 ( LINEAR )

First return of a new periodic comet which brightened up to 16 mag from 2003 to 2004. Now it is 18.8 mag (Aug. 24, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 16 mag in winter between 2021 and 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   3 10.90  -19 48.8   4.071   4.682   121   17.8   3:46 (  0, 35)  
Sept.19   3 10.62  -20 33.4   3.993   4.663   126   17.7   3:19 (  0, 35)  

* (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. 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)  
Sept.12   7  0.97   28 58.0   1.741   1.621    66   18.0   4:15 (264, 47)  
Sept.19   7 18.83   28 16.0   1.592   1.548    68   17.8   4:21 (266, 50)  

* C/2019 E3 ( ATLAS )

It stays observable at 17 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)  
Sept.12   9 56.14  -44 57.2  12.579  11.995    52   17.8   4:15 (308,-27)  
Sept.19   9 58.28  -45 26.0  12.560  11.977    52   17.8   4:21 (311,-22)  

* C/2020 O2 ( Amaral )

Now it is 18.0 mag (Aug. 5, L. S. Amaral). It will brighten up to 16.5 mag in 2021 summer. In the Southern Hemisphere, it stays observable for a while. In the Northern Hemisphere, it is not observable until 2021 February.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  14 53.40  -45 54.9   5.865   5.577    68   17.8  19:36 ( 38, -8)  
Sept.19  14 59.68  -45  9.3   5.931   5.552    63   17.8  19:25 ( 40, -9)  

* P/2019 LD2 ( ATLAS )

Now it is 17.3 mag (Aug. 13, Toshihiko Ikemura, Hirohisa Sato). It stays 18 mag from 2019 to 2020.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  20 50.39   -8 17.1   3.763   4.601   142   17.8  21:23 (  0, 47)  
Sept.19  20 48.89   -8 42.3   3.834   4.603   135   17.9  20:54 (  0, 46)  

* C/2020 N1 ( PanSTARRS )

Now it is 19.3 mag (Aug. 19, P. Carson). 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)  
Sept.12   0 26.91   48 50.7   2.097   2.799   125   18.1   1:03 (180, 76)  
Sept.19   0 20.74   49 45.0   1.987   2.725   128   17.8   0:30 (180, 75)  

* P/2020 P2 ( Boattini )

First return of a new periodic comet which brightened up to 13 mag in 2009. Now it is 18.0 mag (Aug. 18, Mt. Lemmon Survey). 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)  
Sept.12   3 10.64   -1 25.4   0.980   1.743   122   18.4   3:46 (  0, 54)  
Sept.19   3 21.17   -2 23.7   0.897   1.697   126   17.8   3:29 (  0, 53)  

* 178P/Hug-Bell

Now it is 17.7 mag (Aug. 24, ATLAS-MLO, Mauna Loa). 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)  
Sept.12   6 29.12   16 54.6   1.995   1.946    72   17.9   4:15 (284, 48)  
Sept.19   6 42.56   16 58.5   1.944   1.962    76   17.9   4:21 (289, 52)  

* C/2017 K5 ( PanSTARRS )

Sam Deen pointed out that it brightened in outburst twice in 2017 and 2019. It was observed at 20-21 mag in 2017. Then it became fainter than 22.9 mag in 2018 summer (Aug. 29, Sam Deen). However, it brightened up to 17.2 mag in 2019 spring (Mar. 25, B. T. Bolin). Then it faded again down to 19.9 mag (May 29, Toshihiko Ikemura, Hirohisa Sato). Now it is 18.1 mag (July 9, J. Jahn). It is predicted to stay observable at 18 mag for a long time from 2019 to 2021. But actually, it may be fainter than this ephemeris.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  18 25.04  -26 27.8   7.412   7.753   106   17.9  19:36 ( 10, 28)  
Sept.19  18 24.57  -26 52.7   7.534   7.759    99   17.9  19:25 ( 14, 27)  

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