Weekly Information about Bright Comets (2021 June 5: North)

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Updated on June 5, 2021
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Northern Hemisphere.
Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

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* C/2020 T2 ( Palomar )

It brightened rapidly. Now it is very bright as 10.5 mag (May 31, Chris Wyatt). It stays observable at 11 mag in good condition for a long time from spring to summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  13 36.75   21 32.9   1.456   2.100   115   11.0  20:55 ( 14, 76)  
June 12  13 38.77   18 35.6   1.484   2.084   111   11.0  21:00 ( 34, 70)  

* 7P/Pons-Winnecke

Now it is very bright as 9.7 mag (June 4, Michael Jager). It stays bright as 10-12 mag until August. In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it stays observable in good condition for a while. But it becomes extremely low after July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  21 48.08  -14  7.6   0.446   1.239   109   11.5   3:01 (326, 34)  
June 12  22 15.07  -19  1.7   0.442   1.250   111   11.4   2:59 (328, 30)  

* 15P/Finlay

Now it is very bright as 12.5 mag (May 18, Thomas Lehmann). It will brighten very rapidly, and it will brighten up to 10 mag from July to August. It stays observable in the morning sky for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   0 45.53   -1 32.1   1.108   1.136    64   13.0   3:01 (281, 13)  
June 12   1 17.37    2 29.2   1.091   1.092    62   12.4   2:59 (277, 14)  

* C/2019 L3 ( ATLAS )

Now it is 12.5 mag (May 23, Thomas Lehmann). It will brighten up to 10 mag in winter in 2022. In the Northern Hemisphere, it stays observable in good condition for a long time, although it becomes extremely low temporarily from May to June. In the Southern Hemisphere, it is not observable until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   4 24.71   50  8.8   4.931   4.065    28   12.5   3:01 (211,  7)  
June 12   4 38.33   49 57.6   4.903   4.035    28   12.4   2:59 (212,  8)  

* 10P/Tempel 2

Now it is 11 mag (May 12, Giuseppe Pappa). In the Southern Hemisphere, it is observable in the morning sky. In the Northern Hemisphere, it will appear in the morning sky in June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   1 58.40    3 26.1   2.129   1.602    46   12.5   3:01 (267,  1)  
June 12   2 15.68    4 31.6   2.125   1.636    48   12.7   2:59 (267,  3)  

* C/2017 K2 ( PanSTARRS )

Now it is 13.5 mag (May 24, 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 stays extremely low for a while. But it will be observable in good condition at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  17 57.26   43 34.4   5.743   6.199   112   12.7   1:04 (180, 81)  
June 12  17 50.95   43 30.9   5.673   6.141   112   12.7   0:31 (180, 81)  

* 4P/Faye

Now it is 14.4 mag (May 18, Thomas Lehmann). It will brighten up to 10 mag from summer to autumn, and it will be observable in excellent condition. Appearing in the morning sky.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   0 52.49    8 47.0   2.198   1.885    58   13.0   3:01 (272, 18)  
June 12   1  9.44   10 12.4   2.114   1.851    61   12.7   2:59 (271, 20)  

* C/2020 J1 ( SONEAR )

Now it is bright as 12.5 mag (May 30, Michael Jager). It stays 13 mag until early summer. In the Southern Hemisphere, it stays observable in good condition for a long time. It locates somewhat low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  14 37.26  -22  0.2   2.475   3.385   148   13.1  21:40 (  0, 33)  
June 12  14 23.88  -19 25.2   2.563   3.394   138   13.2  21:00 (  0, 36)  

* C/2020 R4 ( ATLAS )

It brightened up to 8.9 mag in April (Apr. 12, Carlos Labordena). Now it is fading. But it is still bright as 12.4 mag (May 17, Chris Wyatt). It will be fading and getting lower rapidly after this. It will be unobservable at 17 mag in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  11  0.83   20 54.3   1.618   1.819    84   13.4  20:55 ( 81, 50)  
June 12  10 56.57   19 29.3   1.850   1.902    77   14.0  21:00 ( 85, 42)  

* 246P/NEAT

Now it is 13.9 mag (May 13, Taras Prystavski). It stays 13-14 mag from 2020 to 2021. It will be observable in good condition after this 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)  
June  5  19 27.83  -29 36.5   2.031   2.917   144   13.6   2:35 (  0, 25)  
June 12  19 24.86  -30 28.8   1.992   2.924   151   13.6   2:05 (  0, 25)  

* 8P/Tuttle

Now it is 16.8 mag (May 28, Jean-Francois Soulier). Brightening very rapidly. It will brighten up to 8.5 mag from September to October. But the condition is bad in this apparition. In the Northern Hemisphere, it is observable only in the extremely low sky until July. In the Southern Hemisphere, it will be observable after late August. But it stays locating low for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   3 43.22   44 38.6   2.436   1.590    26   14.3   3:01 (220,  8)  
June 12   4 10.85   43 42.8   2.377   1.520    25   13.9   2:59 (220,  7)  

* 29P/Schwassmann-Wachmann 1

Now it is not observable. It will appear in the morning sky in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   3 50.14   27 57.9   6.860   5.885    14   14.0   3:01 (231, -5)  
June 12   3 56.23   28 16.0   6.833   5.887    19   13.9   2:59 (233, -1)  

* C/2019 T4 ( ATLAS )

Now it is 14.3 mag (May 31, Chris Wyatt). It is expected to brighten up to 11.5 mag in 2022. It is observable in excellent condition in the Southern Hemisphere. In the Northern Hemisphere, it is not observable until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   8 36.04  -25  0.2   5.426   5.207    72   14.1  20:55 ( 63, -6)  
June 12   8 42.31  -24 23.3   5.466   5.175    68   14.0  21:00 ( 67,-10)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 14.8 mag (May 31, Chris Wyatt). It was expected to brighten up to 13 mag from spring to summer. But actually, it is fainter than originally expected. It stays 14-15 mag until early autumn. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until July in 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  22 10.39  -81 12.1   3.068   3.599   113   14.5   3:01 (354,-27)  
June 12  22 35.27  -82 22.5   3.056   3.597   114   14.5   2:59 (355,-28)  

* C/2018 U1 ( Lemmon )

Now it is 14.8 mag (June 3, Michael Jager). It will stay at 14-15 mag for a long time from 2021 to 2022. It stays observable in good condition after this while brightening gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  17 34.53   -2  4.5   4.177   5.126   157   14.7   0:42 (  0, 53)  
June 12  17 26.48   -2 52.1   4.150   5.114   159   14.7   0:07 (  0, 52)  

* C/2019 T2 ( Lemmon )

It will brighten up to 14.5 mag from spring to summer. In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it is not observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   3 31.09  -66 58.7   2.474   2.686    90   14.7   3:01 (331,-41)  
June 12   4 22.71  -68 14.5   2.466   2.700    91   14.7   2:59 (334,-43)  

* C/2020 F5 ( MASTER )

Now it is 14.8 mag (May 22, Thomas Lehmann). It stays 14-15 mag until the end of 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.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  23 40.92  -35  7.6   4.188   4.368    93   14.8   3:01 (317,  2)  
June 12  23 42.68  -34 51.0   4.105   4.376    98   14.8   2:59 (320,  6)  

* C/2019 N1 ( ATLAS )

It brightened up to 11.6 mag in winter (Feb. 18, Thomas Lehmann). Now it is fading. It has already faded down to 14.2 mag (May 11, Thomas Lehmann). In the Southern Hemisphere, it stays observable in good condition after this. In the Northern Hemisphere, it will never be observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   4 56.93  -52 48.7   2.948   2.865    75   14.8  20:55 ( 47,-53)  
June 12   5  3.21  -52 33.4   3.008   2.929    75   14.9   2:59 (313,-51)  

* C/2021 A7 ( NEOWISE )

Now it is 14.5 mag (May 21, Thomas Lehmann). It stays 15 mag until summer. In the Southern Hemisphere, it stays observable in good condition until June. In the Northern Hemisphere, it is observable in the low sky from March to May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   8  9.74    0 39.8   2.474   2.029    52   15.0  20:55 ( 88,  4)  
June 12   8 22.72    3  9.7   2.537   2.010    48   15.1  21:00 ( 93,  2)  

* C/2021 D1 ( SWAN )

It brightened up to 10.5 mag in early March (Mar. 8, Bob King). Now it is fading. It has already faded down to 18.1 mag (May 11, Slooh.com Canary Islands Observatory). In the Northern Hemisphere, it stays observable in the evening low sky until early June while the comet will be fading. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   6 55.22   28 40.0   2.669   1.841    28   15.3  20:55 (121,  6)  
June 12   7 13.66   27 18.5   2.793   1.930    25   15.6  21:00 (122,  3)  

* 117P/Helin-Roman-Alu 1

Now it is 15.2 mag (May 31, Chris Wyatt). It will brighten up to 13 mag in 2022. In 2021, it is observable at 14-15 mag in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  12 58.77   -0 25.6   2.957   3.565   119   15.3  20:55 ( 22, 52)  
June 12  12 58.75   -0 46.1   3.031   3.550   112   15.3  21:00 ( 34, 49)  

* C/2020 PV6 ( PanSTARRS )

Now it is 15.4 mag (May 30, Hirohisa Sato). It will brighten up to 14 mag in summer, and it will be observable in excellent condition. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  21 42.88   15 34.4   2.242   2.605    99   15.6   3:01 (302, 59)  
June 12  21 30.41   18 26.0   2.095   2.571   106   15.3   2:59 (312, 67)  

* C/2020 M5 ( ATLAS )

Now it is 15.7 mag (May 29, Michael Jager). In the Northern Hemisphere, it stays observable at 15-16 mag for a long time from spring to early 2022. In the Southern Hemisphere, it is not observable until the end of 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  13 51.26   77 18.6   3.169   3.097    76   15.4  20:55 (180, 48)  
June 12  13 13.24   74 20.1   3.186   3.081    74   15.3  21:00 (172, 50)  

* 201P/LONEOS

It has not been observed yet in this apparition. The condition of this apparition is bad. It brightens up to 15.5 mag in spring, however, it is not observable until autumn when it becomes fainter than 19 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   4 40.02   24 36.0   2.234   1.223     3   15.6   3:01 (225,-15)  
June 12   5  8.68   25 33.4   2.246   1.234     3   15.6   2:59 (224,-14)  

* C/2018 N2 ( ASASSN )

Now it is 15.4 mag (Apr. 19, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it stays observable for a long time while it is getting fainter slowly. In the Southern Hemisphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  13 47.21   64 38.4   6.007   6.019    85   15.7  20:55 (179, 61)  
June 12  13 41.03   63 22.2   6.099   6.068    83   15.8  21:00 (170, 61)  

* C/2020 H6 ( ATLAS )

Now it is 16.0 mag (May 10, Michael Jager). It stays observable at 16 mag from 2021 to 2022. Toshihiko Ikemura and Hirohisa Sato reported it was very bright as 14.2 mag on Apr. 19.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  13 41.13   -5  0.1   4.070   4.795   130   15.8  20:55 (  4, 50)  
June 12  13 39.26   -3 49.0   4.152   4.785   123   15.8  21:00 ( 17, 50)  

* C/2020 Y2 ( ATLAS )

Now it is 15.8 mag (May 29, Hiroshi Abe). Toshihiko Ikemura and Hirohisa Sato reported it was bright as 14.7 mag on Apr. 18. It is expected to brighten up to 13 mag in 2022. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it stays observable until June, but it will not be observable at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  12 16.11  -20 25.4   4.166   4.706   116   15.8  20:55 ( 26, 30)  
June 12  12 11.44  -20 23.3   4.230   4.661   109   15.8  21:00 ( 35, 26)  

* C/2019 K7 ( Smith )

Now it is 16.2 mag (May 24, Thomas Lehmann). It stays 15-16 mag until July. In the Northern Hemisphere, it stays observable in good condition for a long time. It is not observable after this in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  18 20.73   55 45.0   5.030   5.293    99   16.0   1:28 (180, 69)  
June 12  18  7.94   56 39.5   5.058   5.322    99   16.0   0:48 (180, 68)  

* C/2017 T2 ( PanSTARRS )

It had been observed as 8-9 mag for a long time in 2020. Now it is fading. It has already faded down to 17.0 mag (May 25, ATLAS-MLO, Mauna Loa). It will be observable in good condition after this in the Southern Hemisphere. It locates extremely low after this in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  16 54.28  -46  9.9   3.882   4.829   156   16.0   0:03 (  0,  9)  
June 12  16 46.13  -46 26.2   3.949   4.892   155   16.1  23:22 (  0,  9)  

* 67P/Churyumov-Gerasimenko

Now it is 16.6 mag (May 30, ATLAS-MLO, Mauna Loa). It will brighten up to 9 mag, and will be observable in good condition in winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  23 41.23   -6 14.6   1.992   2.091    81   16.3   3:01 (296, 23)  
June 12  23 53.96   -4 58.4   1.867   2.035    84   16.0   2:59 (297, 26)  

* 17P/Holmes

Now it is 15.1 mag (May 24, Mike Olason). Appearing in the morning sky. In the Northern Hemisphere, it stays observable in good condition while the comet will be fading. In the Southern Hemipsphere, it stays locating extremely low after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   2 26.43   27 43.6   3.011   2.232    33   16.1   3:01 (243, 10)  
June 12   2 41.04   29 17.2   2.990   2.252    36   16.2   2:59 (243, 12)  

* C/2019 U5 ( PanSTARRS )

Now it is 16.2 mag (May 9, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 11 mag in 2023. In the Northern Hemisphere, it stays observable in good condition for a long time. It locates extremely low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  17 38.44   50 49.2   6.305   6.656   105   16.3   0:46 (180, 74)  
June 12  17 28.88   50 57.8   6.261   6.611   105   16.3   0:09 (180, 74)  

* C/2019 O3 ( Palomar )

Now it is 16.3 mag (May 30, ATLAS-HKO, Haleakala). It stays at 16-17 mag from 2020 to 2021. In the Northern Hemisphere, it stays observable in good condition for a long time. It locates extremely low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  19 30.97   48 30.0   8.592   8.835   100   16.3   2:38 (180, 76)  
June 12  19 26.48   49 14.9   8.563   8.837   102   16.3   2:06 (180, 76)  

* C/2020 O2 ( Amaral )

Now it is 15.7 mag (May 30, W. Hasubick). It stays observable at 16-17 mag in good condition until October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  17  3.84  -23 34.5   3.893   4.907   177   16.4   0:12 (  0, 31)  
June 12  16 58.29  -22 22.1   3.888   4.900   174   16.4  23:34 (  0, 33)  

* C/2019 T3 ( ATLAS )

Now it is 16.6 mag (May 24, ATLAS-MLO, Mauna Loa). It is observable at 16 mag from 2020 to 2021. In the Southern Hemisphere, it is not observable until summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  23 18.75   44 30.2   6.258   5.983    69   16.4   3:01 (240, 50)  
June 12  23 17.30   44 45.6   6.180   5.989    74   16.4   2:59 (240, 55)  

* 106P/Schuster

Now it is 16.4 mag (May 23, Slooh.com Chile Observatory, La Dehesa). It will brighten up to 15 mag from summer to autumn. In the Southern Hemisphere, it stays observable for a long time. In the Northern Hemisphere, it is not observable until late June. But it will be observable in good condition after that.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   1 53.46   -1  2.0   2.198   1.719    49   16.7   3:01 (271,  0)  
June 12   2 11.08    1  8.9   2.132   1.688    50   16.4   2:59 (270,  2)  

* C/2021 K1 ( ATLAS )

Now it is 16.2 mag (May 30, ATLAS-MLO, Mauna Loa). It stays 16.5 mag until August and stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  23 59.89   -4 24.5   2.560   2.517    76   16.5   3:01 (291, 20)  
June 12   0 10.46   -4  5.3   2.491   2.526    80   16.4   2:59 (293, 23)  

* C/2017 Y2 ( PanSTARRS )

Now it is 15.9 mag (May 31, ATLAS-HKO, Haleakala). It is observable at 16.5 mag from spring in 2020 to summer in 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  16 22.02  -17 53.0   3.924   4.930   171   16.5  23:25 (  0, 37)  
June 12  16 11.68  -18 19.9   3.969   4.950   163   16.5  22:47 (  0, 37)  

* C/2021 A1 ( Leonard )

Now it is 17.4 mag (May 29, Michael Jager). It will approach to Earth down to 0.2 a.u. in December, and it is expected to brighten up to 4 mag. In the Northern Hemisphere, it stays observable in good condition for a long time until December while the comet is brightening gradually. In the Southern Hemisphere, it is not observable until mid December. Actually, it is somewhat fainter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  10 37.85   56 26.8   3.627   3.407    69   16.6  20:55 (138, 51)  
June 12  10 33.18   55  9.2   3.631   3.323    64   16.5  21:00 (136, 46)  

* C/2020 S3 ( Erasmus )

It brightened up to 3 mag in December in the SOHO spacecraft images (Dec. 18, Hirohisa Sato). Now it is 15 mag (May 20, Mike Olason). It stays observable in good condition after this while the comet will be fading.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   0 15.36   17  8.0   3.372   3.078    64   16.5   3:01 (269, 30)  
June 12   0 18.19   17 48.2   3.362   3.167    70   16.6   2:59 (272, 35)  

* 284P/McNaught

Now it is 18.6 mag (May 14, Mt. Lemmon Survey). It is expected to brighten up to 15 mag from summer to autumn, and it will be observable in good condition. However, it is fainter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  22 41.53   -5 49.0   2.092   2.396    94   16.7   3:01 (307, 33)  
June 12  22 49.62   -5 27.5   1.999   2.383    99   16.5   2:59 (311, 36)  

* C/2020 V2 ( ZTF )

Now it is 16.8 mag (May 29, Michael Jager). 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 extremely low until mid July, then it becomes unobservable 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)  
June  5  12  5.87   38 40.8   7.069   7.132    89   16.8  20:55 (107, 69)  
June 12  12  3.75   38 26.4   7.118   7.079    83   16.8  21:00 (107, 62)  

* 57P/du Toit-Neujmin-Delporte

Now it is 18.1 mag (June 2, Michael Jager). It will brighten up to 15.5 mag from summer to autumn. It stays observable for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  15 14.49  -13 40.2   1.133   2.098   155   17.0  22:18 (  0, 41)  
June 12  15 10.14  -13 18.7   1.135   2.065   147   16.8  21:46 (  0, 42)  

* 6P/d'Arrest

Now it is 17.3 mag (May 18, Ager). It will brighten very rapidly, and it will be observable at 10 mag in good condition from October to December. In the Northern Hemisphere, it locates somewhat low at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  16 33.36   17 50.3   0.886   1.783   139   17.0  23:36 (  0, 73)  
June 12  16 27.12   17 47.0   0.850   1.737   137   16.8  23:03 (  0, 73)  

* C/2020 R7 ( ATLAS )

It will brighten up to 12.5 mag in 2022 summer. In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it is not observable until August in 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   3 27.36  -43 19.1   5.569   5.285    68   17.0   3:01 (301,-39)  
June 12   3 31.93  -43 59.9   5.466   5.235    71   16.9   2:59 (303,-36)  

* C/2020 S8 ( Lemmon )

It brightened rapidly up to 15.5 mag in April (Apr. 5, Sandor Szabo). Now it is fading. It has already fade down to 17.3 mag (May 30, ATLAS-MLO, Mauna Loa). It will be fainter than 18 mag in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  11 58.92   -1  6.6   1.960   2.442   105   16.9  20:55 ( 42, 45)  
June 12  11 49.53   -3  1.2   2.109   2.462    97   17.2  21:00 ( 52, 37)  

* C/2017 U7 ( PanSTARRS )

Now it is 16.8 mag (May 24, ATLAS-HKO, Haleakala). It will be fading slowly.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  17 46.58  -13 42.2   6.697   7.678   164   17.0   0:54 (  0, 41)  
June 12  17 40.89  -13 21.3   6.704   7.703   169   17.1   0:21 (  0, 42)  

* 413P/2020 W4 ( Larson )

First return of a new periodic comet which brightened up to 16 mag in 2014. Now it is 16.7 mag (May 28, ATLAS-HKO, Haleakala). It stays observable at 16-17 mag in good condition until July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  12 14.11    2 45.4   1.630   2.168   107   17.1  20:55 ( 40, 51)  
June 12  12 18.52    1  7.8   1.694   2.160   102   17.2  21:00 ( 47, 45)  

* C/2021 D2 ( ZTF )

Now it is 17.3 mag (May 30, ATLAS-HKO, Haleakala). It will brighten up to 15.5 mag in winter. In the Northern Hemisphere, it stays observable in good condition for a long time. It is not observable at all in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  21  5.21   59 27.5   3.778   3.793    83   17.4   3:01 (200, 63)  
June 12  20 58.79   62  7.9   3.712   3.752    84   17.3   2:59 (190, 62)  

* P/2014 W12 ( Gibbs )

First return of a new periodic comet observed at 17 mag in 2014. It has not been observed yet in this apparition. It is expected to brighten up to 17 mag from summer to autumn, and it will be observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   0  4.22    4 52.2   1.701   1.680    71   17.4   3:01 (282, 25)  
June 12   0 19.93    7 14.5   1.651   1.676    73   17.3   2:59 (282, 29)  

* 22P/Kopff

Now it is 18.6 mag (May 30, W. Hasubick). It will be observable at 11 mag from winter to spring in 2022. In 2021, it is observable until July or August when it brightens up to 16-17 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  10 31.36   13 24.3   2.931   2.935    80   17.5  20:55 ( 77, 40)  
June 12  10 36.50   12 50.2   2.987   2.895    74   17.4  21:00 ( 81, 34)  

* C/2020 K1 ( PanSTARRS )

Now it is 17.2 mag (May 26, ATLAS-HKO, Haleakala). It is expected to brighten up to 12 mag in 2023. In the Northern Hemisphere, it is observable in good condition in 2021. But it is observable only until November in 2022. In the Southern Hemisphere, it locates extremely low in 2021. But it will be observable in good condition at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  18 24.57   46 32.9   6.547   6.925   107   17.5   1:32 (180, 78)  
June 12  18 18.93   46 30.9   6.477   6.877   109   17.4   0:58 (180, 78)  

* C/2020 F2 ( ATLAS )

Now it is 17.3 mag (May 3, Michael Jager). It stays observable at 17-18 mag for a long time until 2024.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  14 42.37   -7  9.2   8.273   9.125   145   17.5  21:46 (  0, 48)  
June 12  14 38.47   -6 48.9   8.338   9.115   137   17.5  21:15 (  0, 48)  

* 193P/LINEAR-NEAT

Now it is 18.8 mag (May 18, ATLAS-MLO, Mauna Loa). It will brighten up to 15-16 mag in autumn and it will be observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  22 58.66  -11 14.5   1.958   2.247    92   17.8   3:01 (308, 27)  
June 12  23  6.93  -10  2.6   1.870   2.235    97   17.6   2:59 (311, 30)  

* C/2020 F7 ( Lemmon )

Now it is 17.7 mag (May 12, ATLAS-HKO, Haleakala). It brightened rapidly. It stays 17-18 mag for a long time from 2021 to 2022. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is observable only until May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   8 19.22   -8 38.9   5.909   5.465    59   17.6  20:55 ( 79,  1)  
June 12   8 21.17   -9  2.5   5.979   5.454    54   17.6  21:00 ( 83, -6)  

* 108P/Ciffreo

It has not been observed yet in this apparition. It will brighten rapidly up to 15 mag in autumn. It will be observable in excellent condition in the Northern Hemisphere. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   1 27.06    0 43.0   2.316   1.910    54   17.8   3:01 (273,  6)  
June 12   1 43.00    2 27.4   2.236   1.878    56   17.6   2:59 (273,  9)  

* C/2020 T4 ( PanSTARRS )

In the Northern Hemisphere, it is observable at 17-18 mag from spring to autumn. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   3 27.02   67 26.1   2.787   2.220    46   17.7   3:01 (203, 24)  
June 12   3 54.27   70 35.7   2.735   2.209    49   17.6   2:59 (200, 26)  

* C/2021 E3 ( ZTF )

Now it is 17.5 mag (May 29, R. Naves, M. Campas). It is expected to brighten up to 11 mag from spring to summer in 2022. In the Southen Hemisphere, it locates somewhat low in 2021, but it will be observable in good condition at the high light for a long time. In the Northern Hemisphere, it is observable in good condition in 2021, but it will not be observable at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  20 50.25   37 26.1   4.319   4.571    97   17.8   3:01 (253, 78)  
June 12  20 44.91   37 50.3   4.179   4.508   102   17.6   2:59 (239, 84)  

* 152P/Helin-Lawrence

Now it is 17.5 mag (May 30, ATLAS-MLO, Mauna Loa). It will brighten up to 16 mag in 2022. In 2021, it stays observable at 18 mag until September.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  13 19.28    3  9.4   2.661   3.314   122   17.7  20:55 ( 15, 57)  
June 12  13 19.22    2 40.6   2.730   3.302   115   17.7  21:00 ( 28, 54)  

* 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 stays 18 mag until autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   0 46.04   17 12.2   8.358   7.861    57   17.8   3:01 (265, 24)  
June 12   0 47.57   17 46.2   8.303   7.904    63   17.8   2:59 (267, 29)  

* 99P/Kowal 1

Now it is 17.3 mag (May 24, ATLAS-HKO, Haleakala). It stays 17-18 mag for a long time from 2021 to 2023.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  10 44.18   10 53.0   4.847   4.850    84   17.8  20:55 ( 72, 41)  
June 12  10 47.31   10 27.8   4.946   4.843    78   17.9  21:00 ( 77, 35)  

* C/2019 C1 ( ATLAS )

Now it is 17.7 mag (May 10, ATLAS-MLO, Mauna Loa). Fading slowly. In 2021, it stays observable at 17-18 mag in good condition until early summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  12 54.68  -12 41.0   6.481   7.084   122   17.9  20:55 ( 18, 40)  
June 12  12 55.07  -12 17.1   6.593   7.102   116   17.9  21:00 ( 28, 38)  

* C/2016 Q2 ( PanSTARRS )

Now it is 18.6 mag (May 14, Michael Jager). In the Northern Hemisphere, it stays observable at 18 mag for a long time from 2021 to 2022. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  17 11.43   56  6.2   6.815   7.084   101   17.9   0:19 (180, 69)  
June 12  17  0.81   56 21.4   6.831   7.085   100   17.9  23:35 (180, 69)  

* 47P/Ashbrook-Jackson

Now it is 18.6 mag (Apr. 4, Michael Jager). Although it is around the aphelion, it is much brighter than originally predicted.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5  10 45.53    9 37.8   5.423   5.428    84   18.8  20:55 ( 70, 41)  
June 12  10 47.57    9 16.9   5.534   5.430    78   18.9  21:00 ( 76, 34)  

* C/2020 K5 ( PanSTARRS )

It was expected to brighten up to 13 mag from spring to summer. But actually, it is extremely faint as 19.0 mag (Mar. 22, A. C. Gilmore, P. M. Kilmartin). In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until late August.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  5   3 12.71  -41 34.1   1.593   1.536    68   18.8   3:01 (300,-36)  
June 12   3 44.09  -39 19.6   1.631   1.538    66   18.9   2:59 (297,-36)  

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