Weekly Information about Bright Comets (2020 July 25: North)

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Updated on July 26, 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 F3 ( NEOWISE )

Great comet. 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. But it is still very bright as 3.9 mag (July 24, Marco Goiato). It is appearing in the evening sky soon also in the Southern Hemisphere. It stays observable in the evening sky until early October when it fades down to 13 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  11  3.95   41 31.1   0.697   0.674    41    4.2  20:47 (124, 24)  
Aug.  1  12 32.26   27 45.6   0.793   0.827    52    5.5  20:39 (103, 30)  

* C/2019 U6 ( Lemmon )

It brightened up to 6.0 mag in June (June 13, Marco Goiato). Now it is fading. But it is still bright as 9.0 mag (July 23, Marco Goiato). 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)  
July 25  12 53.56   14 29.2   1.041   1.115    65    8.8  20:47 ( 86, 32)  
Aug.  1  13 25.63   17 14.7   1.145   1.187    66    9.6  20:39 ( 87, 36)  

* 2P/Encke

Now it is bright as 9.2 mag (July 23, Marco Goiato). In the Southern Hemisphere, it stays observable in good condition in the evening sky while the comet will be fading. In the Northern Hemisphere, it is not observable until mid August when the comet will fade down to 12 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  11  3.33   -8 33.3   0.637   0.773    49    9.6  20:47 ( 81, -4)  
Aug.  1  12  7.37  -17 13.5   0.624   0.896    60   10.5  20:39 ( 68,  0)  

* C/2017 T2 ( PanSTARRS )

Now it is 10.4 mag (July 21, Chris Wyatt). It stays observable in the evening sky until September when it fades down to 12 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  13 15.62   24  2.6   2.071   1.942    68    9.8  20:47 ( 93, 40)  
Aug.  1  13 26.89   19 34.0   2.175   1.993    66   10.0  20:39 ( 89, 37)  

* 88P/Howell

Now it is 10.2 mag (July 21, Chris Wyatt). It will brighten up to 8-9 mag from summer to autumn. It will be observable in excellent condition in the Southern Hemisphere. It locates very low around the high light in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  13 31.51  -10 32.6   1.266   1.521    82   10.3  20:47 ( 57, 23)  
Aug.  1  13 45.29  -12 14.0   1.281   1.488    79   10.1  20:39 ( 57, 21)  

* 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. But it is still bright as 12.4 mag (July 20, Paul Camilleri). 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)  
July 25   4 48.94   13 17.6   1.975   1.540    50   12.4   3:24 (265, 17)  
Aug.  1   5  7.74   13 13.9   1.974   1.577    52   12.7   3:32 (268, 20)  

* 249P/LINEAR

Now it is 14.8 mag (July 25, Martin Masek). It was expected to brighten rapidly up to 9.5 mag in June. But actually, it is fainter than predicted. However, it became very bright as 7.5 mag in SOHO spacecraft images on June 19 (Karl Battams). It is 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)  
July 25   5 25.08   26 52.0   1.100   0.731    40   13.5   3:24 (249, 17)  
Aug.  1   5 41.15   26 18.9   1.197   0.833    43   14.6   3:32 (252, 20)  

* 29P/Schwassmann-Wachmann 1

Now it is 14.1 mag (July 25, Martin Masek).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25   2 44.70   25 26.1   5.977   5.814    75   13.6   3:24 (270, 48)  
Aug.  1   2 47.42   25 48.6   5.872   5.816    81   13.6   3:32 (274, 55)  

* C/2020 K8 ( Catalina-ATLAS )

Now it is 15.5 mag (July 22, Martin Masek). Small comet. But it will approach to Sun down to 0.47 a.u. in September, and it is expected to brighten up to 11 mag. It stays observable in good condition until late August while the comet will be brightening up to 11 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25   2  0.15   31 22.7   0.806   1.223    83   14.4   3:24 (267, 60)  
Aug.  1   2 58.96   32 17.7   0.696   1.102    77   13.6   3:32 (262, 56)  

* C/2020 F8 ( SWAN )

It brightened up to 4.7 mag in early May (May 2, Marco Goiato). However, it is fading and getting diffused after that. It had already faded down to 7.3 mag in late May (May 21, Mitsunori Tsumura). It will appear in the morning sky soon. Then it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25   6 35.10   23 24.8   2.217   1.356    24   13.8   3:24 (242,  2)  
Aug.  1   6 39.03   21 25.2   2.266   1.476    29   14.2   3:32 (248,  7)  

* C/2019 N1 ( ATLAS )

Now it is 13.5 mag (July 10, Giuseppe Pappa). It is expected to brighten up to 12 mag from autumn to winter. In the Northern Hemisphere, it stays observable in good condition while the comet will be brightening gradually, but it is hardly observable at the high light. In the Southern Hemisphere, it is not observable for a long time, but it will be observable in good condition after the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  12  4.94   43 41.5   2.849   2.375    52   13.9  20:47 (123, 34)  
Aug.  1  12  9.06   40  0.1   2.856   2.317    48   13.8  20:39 (120, 30)  

* C/2018 N2 ( ASASSN )

Now it is 13.9 mag (July 10, Giuseppe Pappa). 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)  
July 25   8 47.30   85 17.8   4.276   3.967    65   14.3  20:47 (175, 32)  
Aug.  1  10 31.82   84 17.9   4.295   4.007    66   14.3  20:39 (173, 34)  

* 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 in September.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  12 58.76    6  9.7   3.288   3.080    69   14.3  20:47 ( 77, 27)  
Aug.  1  13  5.28    4 54.0   3.360   3.067    64   14.3  20:39 ( 78, 24)  

* 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, Thomas Lehmann reported it is bright as 15.3 mag on June 25, and Giuseppe Pappa reported as 14 mag on July 10. 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)  
July 25   9 46.48   77 53.8   1.224   1.121    59   14.9  20:47 (166, 30)  
Aug.  1  10 16.31   69 17.2   1.291   1.061    53   14.8  20:39 (157, 27)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 15.4 mag (July 9, R. Carstens). It will brighten up to 13 mag in 2021. In the Northern Hemisphere, it will be unobservable soon. In the Southern Hemisphere, it stays observable at 15 mag until October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  13 50.76  -24  8.2   4.503   4.651    92   14.9  20:47 ( 44, 16)  
Aug.  1  13 51.81  -24 40.4   4.574   4.614    85   14.9  20:39 ( 47, 12)  

* C/2017 K2 ( PanSTARRS )

Now it is 15.0 mag (July 12, Sandor Szabo). 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)  
July 25  17 17.24   51 11.0   8.434   8.649    98   15.0  21:02 (180, 74)  
Aug.  1  17 13.68   50 29.2   8.410   8.597    97   15.0  20:39 (175, 75)  

* C/2020 F5 ( MASTER )

Now it is 15.9 mag (July 8, iTelescope Observatory, Siding Spring). 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)  
July 25  14 42.76  -80 31.0   4.311   4.762   110   15.3  20:47 (  6,-27)  
Aug.  1  14 53.51  -79 43.3   4.324   4.738   108   15.2  20:39 (  7,-27)  

* C/2020 J1 ( SONEAR )

Now it is 15.2 mag (July 3, R. Carstens). 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)  
July 25  20 14.35  -66 14.2   3.398   4.162   133   15.3   0:06 (  0,-11)  
Aug.  1  19 42.20  -66 20.9   3.393   4.125   130   15.3  22:58 (  0,-11)  

* 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 15.8 mag (June 14, SONEAR Observatory, Oliveira). In the Southern Hemisphere, it stays observable for a long time. In the Northern Hemisphere, it will appear in the morning sky soon, but it stays low for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25   3 25.05  -35  2.9   3.951   4.051    88   15.3   3:24 (316,  2)  
Aug.  1   3 24.87  -35 18.1   3.909   4.084    92   15.3   3:32 (322,  6)  

* C/2019 K7 ( Smith )

Now it is 15.5 mag (July 9, Sandor Szabo). 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)  
July 25  19 29.84   19  0.5   3.664   4.486   139   15.3  23:14 (  0, 74)  
Aug.  1  19 19.94   19 33.1   3.694   4.490   136   15.4  22:37 (  0, 75)  

* 115P/Maury

Now it is 15.2 mag (July 12, Sandor Szabo). It is observable at 15-16 mag in good condition from June to August.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  19 11.45   -2 41.2   1.086   2.057   156   15.4  22:57 (  0, 52)  
Aug.  1  19  9.60   -3 39.4   1.103   2.057   152   15.4  22:28 (  0, 51)  

* 17P/Holmes

Now it is 16.1 mag (June 29, ATLAS-HKO, Haleakala). It brightens up to 13.5 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 14 mag. It stays locating very low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  17 59.95  -44  9.0   1.718   2.597   142   15.7  21:46 (  0, 11)  
Aug.  1  17 55.40  -43  1.8   1.737   2.569   136   15.5  21:14 (  0, 12)  

* C/2019 L3 ( ATLAS )

Now it is 14.9 mag (July 9, Sandor Szabo). 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)  
July 25   0 54.16   59 17.4   5.856   5.825    83   15.7   3:24 (202, 62)  
Aug.  1   0 55.64   60 17.4   5.743   5.781    87   15.6   3:32 (193, 64)  

* C/2017 U7 ( PanSTARRS )

Now it is 15.2 mag (July 9, 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)  
July 25  18 40.49  -28 31.4   5.825   6.766   156   15.7  22:26 (  0, 27)  
Aug.  1  18 33.53  -28 11.5   5.898   6.781   148   15.7  21:51 (  0, 27)  

* 84P/Giclas

Now it is 15.6 mag (July 13, D. L. Feltenberger, N. Paul). 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)  
July 25   5 16.36   18 38.4   2.391   1.784    42   15.9   3:24 (257, 14)  
Aug.  1   5 34.27   19  1.9   2.368   1.803    45   15.8   3:32 (259, 18)  

* C/2019 Y1 ( ATLAS )

It brightened up to 8 mag from March to April. It continued brightening for a while even after the perihelion passage on Mar. 15. But it is fading now. It is still visible visually as 13.0 mag (July 12, Sandor Szabo). However, it has already faded down to 17.0 mag by CCD (July 2, Charles S. Morris). It seems to be a fragment of C/1988 A1 (Liller), like C/1996 Q1 (Tabur) and C/2015 F3 (SWAN).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  12 32.88   11 51.1   2.596   2.292    61   15.9  20:47 ( 86, 25)  
Aug.  1  12 39.64    9 14.9   2.770   2.381    57   16.4  20:39 ( 86, 21)  

* C/2018 U1 ( Lemmon )

Now it is 15.8 mag (July 9, Sandor Szabo). 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)  
July 25  17 55.38   30  2.3   5.544   6.110   119   16.1  21:40 (  0, 85)  
Aug.  1  17 49.68   28 53.1   5.556   6.081   116   16.1  21:07 (  0, 84)  

* 257P/Catalina

Now it is 16.6 mag (July 5, ATLAS-HKO, Haleakala). It will brighten up to 16.5 mag and will be observable in good condition from June to October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  20 25.84   17 26.5   1.276   2.174   142   16.4   0:15 (  0, 73)  
Aug.  1  20 22.09   17 12.7   1.258   2.165   144   16.4  23:40 (  0, 72)  

* 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 15.9 mag (July 8, ATLAS-HKO, Haleakala). 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)  
July 25   0 38.31    0 30.7   5.480   5.953   113   16.4   3:24 (333, 53)  
Aug.  1   0 36.56    0 47.2   5.419   5.994   120   16.4   3:32 (348, 55)  

* 162P/Siding Spring

Now it is 16.8 mag (July 2, R. Carstens). 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)  
July 25  22 26.98  -67 18.7   1.142   1.941   128   16.6   2:17 (  0,-12)  
Aug.  1  22 18.95  -68 50.9   1.098   1.892   127   16.5   1:41 (  0,-14)  

* C/2017 Y2 ( PanSTARRS )

Now it is 16.7 mag (July 1, ATLAS-HKO, Haleakala). It will be 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)  
July 25  18  4.13   18 29.5   3.990   4.704   129   16.6  21:49 (  0, 73)  
Aug.  1  17 55.10   17  2.5   4.034   4.695   125   16.6  21:13 (  0, 72)  

* 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 16.3 mag (July 3, ATLAS-HKO, Haleakala). 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)  
July 25  23 50.66  -30 45.8   3.651   4.386   131   16.6   3:24 (356, 24)  
Aug.  1  23 43.84  -30 54.6   3.622   4.426   137   16.7   3:05 (  0, 24)  

* C/2019 T2 ( Lemmon )

Now it is 17.0 mag (July 12, ATLAS-HKO, Haleakala). 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)  
July 25  23  8.78    4 39.3   3.075   3.824   131   16.8   2:58 (  0, 60)  
Aug.  1  23  2.93    2 56.2   2.940   3.776   140   16.7   2:25 (  0, 58)  

* 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 not observable. It will be observable from autumn to winter, but it locating extremely low.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25   7 25.01  -25 48.6   7.523   6.874    47   16.8   3:24 (279,-36)  
Aug.  1   7 30.63  -26  4.9   7.475   6.834    47   16.7   3:32 (282,-30)  

* C/2019 T3 ( ATLAS )

Now it is 17.5 mag (July 11, Jean-Francois Soulier). It will be 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)  
July 25   1 49.95   72 35.3   6.359   6.145    73   17.0   3:24 (195, 49)  
Aug.  1   1 41.14   73 13.2   6.276   6.133    77   16.9   3:32 (190, 50)  

* 304P/Ory

Now it is 18.3 mag (June 28, Jean-Benoit de Vanssay). It brightens up to 16 mag in 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)  
July 25   4  0.31   19  2.0   1.425   1.277    60   17.3   3:24 (267, 30)  
Aug.  1   4 27.65   20 23.2   1.406   1.266    60   17.0   3:32 (267, 32)  

* C/2019 C1 ( ATLAS )

Now it is 17.1 mag (July 2, ATLAS-MLO, Mauna Loa). It stays observable at 16-17 mag from 2020 to 2021. It locates somewhat low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  11 16.50  -14 46.8   7.121   6.603    55   17.0  20:47 ( 76, -5)  
Aug.  1  11 21.33  -14 47.0   7.206   6.607    50   17.0  20:39 ( 78, -8)  

* 156P/Russell-LINEAR

Now it is 18.7 mag (July 13, ATLAS-MLO, Mauna Loa). It is expected to brighten up to 15 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)  
July 25  23 59.63  -33 56.5   1.030   1.848   129   17.2   3:24 (355, 21)  
Aug.  1   0  6.13  -34 43.3   0.950   1.800   132   17.0   3:27 (  0, 20)  

* C/2019 O3 ( Palomar )

Now it is 16.9 mag (July 3, ATLAS-MLO, Mauna Loa). It stays at 17 mag from 2020 to 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  19 23.14   32  3.8   8.273   8.916   126   17.1  23:08 (  0, 87)  
Aug.  1  19 19.03   32 11.2   8.280   8.910   125   17.1  22:36 (  0, 87)  

* C/2020 M3 ( ATLAS )

Now it is 17.4 mag (July 13, ATLAS-MLO, Mauna Loa). It will brighten up to 14 mag in November, and will be observable in excellent condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25   1 13.57  -33 45.0   1.173   1.836   113   17.5   3:24 (339, 18)  
Aug.  1   1 31.92  -34 25.7   1.082   1.769   114   17.1   3:32 (343, 18)  

* C/2014 F3 ( Sheppard-Trujillo )

It will pass the perihelion in 2021, and it was predicted to be observable at 17-18 mag from 2020 to 2022. However, it has not been observed at all since 2015. It was not detected, fainter than 20.5 mag, in 2017 May (Werner Hasubick).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  20 27.34  -22 22.9   4.922   5.936   176   17.2   0:17 (  0, 33)  
Aug.  1  20 24.49  -22 27.7   4.915   5.925   173   17.2  23:42 (  0, 33)  

* 278P/McNaught

Now it is 17.1 mag (July 6, ATLAS-MLO, Mauna Loa). It became brighter than orignally predicted. It stays observable at 17 mag in good condition until autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  13 29.11  -14 11.3   1.979   2.122    83   17.3  20:47 ( 55, 20)  
Aug.  1  13 39.89  -15 18.4   2.042   2.113    79   17.3  20:39 ( 56, 17)  

* 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 late August also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25   6 24.58  -10  3.8   7.961   7.222    40   17.3   3:24 (271,-16)  
Aug.  1   6 27.45  -10  6.0   7.968   7.275    44   17.3   3:32 (276, -9)  

* P/2020 M2 ( Lemmon )

First return of a new periodic comet which brightened up to 17.5 mag in 2012. Now it is 17.6 mag (June 30, Hidetaka 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)  
July 25   3 38.34   23 57.4   2.539   2.292    64   17.4   3:24 (265, 37)  
Aug.  1   3 50.56   25  5.9   2.474   2.298    68   17.4   3:32 (266, 42)  

* C/2017 M4 ( ATLAS )

It brightened up to 12-13 mag from 2018 to 2019. Now it is fading. It has already faded down to 17.7 mag (July 3, P. Camilleri, H. Williams). In the Southern Hemisphere, it stays observable in good condition for a long time. It will never be observable after this in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25   9 35.41  -56 39.1   6.035   5.909    78   17.6  20:47 ( 42,-40)  
Aug.  1   9 39.55  -56 24.1   6.132   5.956    75   17.7  20:39 ( 42,-42)  

* 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)  
July 25  18 41.00  -22 57.2   6.770   7.717   157   17.6  22:27 (  0, 32)  
Aug.  1  18 37.59  -23 31.1   6.828   7.721   149   17.7  21:56 (  0, 31)  

* 254P/McNaught

Now it is 18.8 mag (July 18, Jost Jahn). It will brighten up to 17.5 mag in autumn. 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)  
July 25  23 32.43  -23  3.5   2.359   3.158   134   17.7   3:21 (  0, 32)  
Aug.  1  23 32.62  -24 36.4   2.303   3.154   140   17.7   2:54 (  0, 31)  

* 28P/Neujmin 1

Now it is 17.2 mag (July 9, ATLAS-MLO, Mauna Loa). 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)  
July 25  14  3.25  -28 44.1   2.672   2.959    96   17.7  20:47 ( 39, 14)  
Aug.  1  14  7.36  -28 38.2   2.710   2.904    90   17.7  20:39 ( 42, 12)  

* P/2019 LD2 ( ATLAS )

Now it is 17.5 mag (June 28, Ken-ichi Kadota). It stays 18 mag from 2019 to 2020.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  21 11.70   -5 19.0   3.618   4.589   160   17.7   1:01 (  0, 50)  
Aug.  1  21  8.33   -5 39.3   3.597   4.590   166   17.7   0:30 (  0, 49)  

* (6478) Gault

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)  
July 25   0 35.19   14  2.0   1.587   2.137   108   17.9   3:24 (323, 65)  
Aug.  1   0 38.72   13 36.9   1.525   2.152   114   17.7   3:32 (342, 68)  

* C/2010 U3 ( Boattini )

Now it is 18.0 mag (July 2, A. Diepvens). It will be fading slowly after this. It is observable in good condition in the Northern Hemisphere. In the Southern Hemisphere, it is observable in the extremely low sky only in 2021 spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25  12 43.90   45  5.9   9.440   8.971    59   17.8  20:47 (122, 41)  
Aug.  1  12 46.34   44 14.1   9.508   8.985    56   17.8  20:39 (122, 38)  

* C/2019 E3 ( ATLAS )

Now it is 18.2 mag (Apr. 27, iTelescope Observatory, Siding Spring). It stays 17 mag for a long time until 2027. It is observable in good condition in the Southern Hemisphere. It is not observable in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25   9 40.30  -42 55.8  12.514  12.126    65   17.8  20:47 ( 59,-37)  
Aug.  1   9 42.46  -43  4.0  12.543  12.107    62   17.8  20:39 ( 60,-40)  

* 173P/Mueller 5

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)  
July 25   5 14.38   15 37.9   5.390   4.709    43   17.9   3:24 (260, 13)  
Aug.  1   5 20.58   15 47.8   5.302   4.698    48   17.8   3:32 (264, 19)  

* 312P/NEAT

It has not been observed yet in this apparition. 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)  
July 25  23 13.63   -6 10.8   1.192   2.043   135   18.0   3:02 (  0, 49)  
Aug.  1  23 16.99   -7 43.2   1.134   2.031   141   17.9   2:38 (  0, 47)  

* C/2019 Y4 ( ATLAS )

Fragment of C/1844 Y1 (Great Comet). It brightened up to 7.0 mag in late March ((Mar. 30, Charles S. Morris). But the nucleus was split into some fragments, and it faded out after that. In the Northern Hemisphere, it is not observable after this. In the Southern Hemisphere, it is appearing in the morning sky, but it locates extremely low.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 25   6 31.63    1 36.6   2.136   1.379    31   19.5   3:24 (261,-10)  
Aug.  1   6 42.88    1  5.4   2.229   1.507    34   20.0   3:32 (265, -6)  

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