Weekly Information about Bright Comets (2021 July 3: North)

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Updated on July 3, 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 )

Now it is very bright as 9.5 mag (June 27, Marco Goiato). It stays observable at 10 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)  
July  3  13 52.49    9  7.0   1.604   2.057   101   10.0  21:03 ( 52, 53)  
July 10  13 59.32    5 54.6   1.657   2.055    97   10.0  21:00 ( 54, 47)  

* 15P/Finlay

It brightened very rapidly. Now it is very bright as 10.9 mag (June 24, Thomas Lehmann). It stays 10 mag until 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)  
July  3   2 53.82   13 49.3   1.116   1.004    55   10.8   3:04 (266, 19)  
July 10   3 25.56   16 57.3   1.144   0.993    54   10.4   3:09 (263, 21)  

* 7P/Pons-Winnecke

Now it is very bright as 10.3 mag (June 24, Thomas Lehmann). 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 becomes extremely low after July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3  23 23.87  -33  7.6   0.473   1.315   119   11.3   3:04 (339, 19)  
July 10  23 40.60  -37 10.7   0.495   1.346   121   11.3   3:09 (344, 16)  

* 4P/Faye

Now it is 12.6 mag (June 22, Thomas Lehmann). It will brighten up to 10 mag from summer to autumn, and it will be observable in excellent condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3   2  2.90   14  7.7   1.878   1.761    67   12.0   3:04 (273, 30)  
July 10   2 21.58   15 15.7   1.805   1.735    69   11.8   3:09 (274, 33)  

* 8P/Tuttle

Now it is 16.1 mag (June 8, Ken-ichi Kadota). 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. It is fainter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3   5 32.47   38 27.9   2.204   1.321    22   12.6   3:04 (225,  4)  
July 10   5 58.53   35 50.2   2.147   1.261    21   12.1   3:09 (228,  4)  

* C/2019 L3 ( ATLAS )

Now it is 12.2 mag (June 17, 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 became 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)  
July  3   5 18.38   49 12.5   4.781   3.951    31   12.3   3:04 (218, 13)  
July 10   5 31.32   48 53.5   4.728   3.924    33   12.2   3:09 (221, 16)  

* C/2017 K2 ( PanSTARRS )

Now it is 12.3 mag (June 10, 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 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)  
July  3  17 31.35   42 23.3   5.507   5.967   112   12.5  22:44 (180, 83)  
July 10  17 25.12   41 41.6   5.467   5.908   111   12.4  22:10 (180, 83)  

* 10P/Tempel 2

It brightened up to 10.1 mag in spring (Apr. 10, Marco Goiato). Now it is fading. It has already faded down to 14.4 mag (June 19, Slooh.com Chile Observatory, La Dehesa). In the Southern Hemisphere, it is locates high in the morning sky. Appearing in the morning sky also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3   3  3.62    7  5.0   2.098   1.748    56   13.2   3:04 (270, 13)  
July 10   3 18.21    7 41.6   2.084   1.787    59   13.3   3:09 (273, 17)  

* C/2020 J1 ( SONEAR )

Now it is bright as 12.4 mag (June 29, Thomas Lehmann). 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)  
July  3  13 56.21  -12 57.1   2.937   3.429   110   13.6  21:03 ( 35, 35)  
July 10  13 50.61  -11 17.4   3.084   3.443   102   13.7  21:00 ( 43, 33)  

* 246P/NEAT

Now it is 13.7 mag (June 8, Hirohisa Sato). 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)  
July  3  19 10.67  -32 58.5   1.945   2.949   168   13.7   0:28 (  0, 22)  
July 10  19  5.04  -33 40.3   1.955   2.958   168   13.7  23:50 (  0, 21)  

* 29P/Schwassmann-Wachmann 1

Appearing in the morning sky. Now it is 16.4 mag (June 25, Jean-Francois Soulier).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3   4 13.85   29  7.8   6.697   5.893    34   13.9   3:04 (242, 11)  
July 10   4 19.40   29 24.0   6.634   5.895    40   13.9   3:09 (245, 17)  

* C/2019 T4 ( ATLAS )

Now it is 14.3 mag (June 27, 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)  
July  3   9  2.82  -23  1.0   5.571   5.081    56   13.9  21:03 ( 77,-22)  
July 10   9 10.10  -22 43.0   5.600   5.051    52   13.9  21:00 ( 79,-25)  

* C/2020 PV6 ( PanSTARRS )

Now it is 14.9 mag (June 14, Michael Jager). 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)  
July  3  20 29.18   27 21.0   1.761   2.477   124   14.6   1:47 (  0, 82)  
July 10  20  0.03   29 49.5   1.701   2.450   126   14.4   0:51 (  0, 85)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 14.8 mag (June 27, 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)  
July  3  23 48.32  -85 11.9   3.059   3.597   114   14.5   3:04 (357,-31)  
July 10   0  6.96  -85 55.9   3.072   3.599   113   14.6   3:09 (358,-31)  

* C/2020 F5 ( MASTER )

Now it is 14.8 mag (June 13, 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. It locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3  23 42.90  -34 21.5   3.869   4.406   115   14.7   3:04 (336, 16)  
July 10  23 41.17  -34 16.5   3.799   4.417   121   14.6   3:09 (342, 18)  

* C/2018 U1 ( Lemmon )

Now it is 14.6 mag (June 9, Toshihiko Ikemura, Hirohisa Sato). It stays 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)  
July  3  17  2.50   -5 37.4   4.182   5.082   149   14.7  22:15 (  0, 49)  
July 10  16 55.12   -6 37.6   4.228   5.072   142   14.7  21:41 (  0, 48)  

* 67P/Churyumov-Gerasimenko

Now it is 15.6 mag (June 27, 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)  
July  3   0 34.04   -0 56.8   1.507   1.869    93   15.1   3:04 (304, 37)  
July 10   0 48.26    0 28.6   1.394   1.814    96   14.8   3:09 (307, 41)  

* 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)  
July  3   7  0.83  -67 24.6   2.549   2.752    90   14.9  21:03 ( 25,-48)  
July 10   7 43.65  -65 56.1   2.609   2.773    88   15.0  21:00 ( 28,-47)  

* C/2021 A7 ( NEOWISE )

Now it is 14.2 mag (June 10, Thomas Lehmann). It is not observable in the Northern Hemisphere. It will be unobservable soon also in the Southern Hemisphere. In the Northern Hemisphere, it will appear in the morning sky at 16 mag in October. 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  3   9  2.41    9 22.0   2.719   1.974    34   15.1  21:03 (104, -4)  
July 10   9 15.86   11  3.9   2.775   1.969    30   15.2  21:00 (107, -5)  

* 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 15.2 mag (June 22, 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)  
July  3   5 19.48  -53  8.9   3.162   3.123    78   15.3   3:04 (313,-40)  
July 10   5 23.83  -53 45.5   3.206   3.188    79   15.3   3:09 (315,-36)  

* C/2020 M5 ( ATLAS )

Now it is 15.8 mag (June 16, 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)  
July  3  12 28.79   64  6.5   3.284   3.042    67   15.3  21:03 (149, 48)  
July 10  12 24.48   60 41.4   3.330   3.032    64   15.3  21:00 (143, 46)  

* 117P/Helin-Roman-Alu 1

Now it is 15.9 mag (June 29, Thomas Lehmann). 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)  
July  3  13  3.66   -2 15.5   3.275   3.505    94   15.4  21:03 ( 55, 36)  
July 10  13  6.82   -2 53.3   3.360   3.490    88   15.4  21:00 ( 59, 32)  

* C/2020 R4 ( ATLAS )

It brightened up to 8.9 mag in April (Apr. 12, Carlos Labordena). Now it is fading. It has already faded down to 14.8 mag (June 30, Thomas Lehmann). 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)  
July  3  10 54.75   16 13.6   2.508   2.152    58   15.5  21:03 ( 94, 22)  
July 10  10 56.17   15 20.2   2.710   2.235    52   15.9  21:00 ( 97, 17)  

* C/2020 O2 ( Amaral )

Now it is 15.6 mag (June 26, ATLAS-MLO, Mauna Loa). It stays observable at 15-16 mag in good condition until autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3  16 43.33  -18 46.9   3.970   4.882   150   15.6  21:57 (  0, 36)  
July 10  16 39.33  -17 39.4   4.028   4.878   142   15.6  21:25 (  0, 37)  

* 106P/Schuster

Now it is 16.7 mag (June 11, J. L. Virlichie, P. Traverse, J. P. Desgrees). 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 will be getting higher gradually after this, and it will be observable in good condition after summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3   3  5.76    7 43.2   1.951   1.608    55   15.8   3:04 (270, 13)  
July 10   3 24.64    9 52.9   1.896   1.586    56   15.7   3:09 (270, 17)  

* C/2020 Y2 ( ATLAS )

Now it is 15.7 mag (June 9, Toshihiko Ikemura, Hirohisa Sato). 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)  
July  3  12  2.45  -20 37.1   4.444   4.527    88   15.8  21:03 ( 53, 12)  
July 10  12  1.00  -20 49.7   4.516   4.483    81   15.8  21:00 ( 57,  8)  

* C/2020 H6 ( ATLAS )

Now it is 16.2 mag (June 25, ATLAS-HKO, Haleakala). It stays observable at 16 mag from 2021 to 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3  13 37.56   -0 57.2   4.444   4.757   101   15.9  21:03 ( 48, 43)  
July 10  13 38.26   -0 13.1   4.549   4.749    95   15.9  21:00 ( 54, 39)  

* C/2018 N2 ( ASASSN )

Now it is 15.7 mag (June 9, 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)  
July  3  13 31.06   59 17.5   6.385   6.212    75   16.0  21:03 (148, 57)  
July 10  13 30.06   57 54.3   6.481   6.260    73   16.0  21:00 (143, 55)  

* 284P/McNaught

Now it is 17.0 mag (June 25, ATLAS-HKO, Haleakala). 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)  
July  3  23  9.65   -5  5.3   1.736   2.349   114   16.1   3:04 (330, 46)  
July 10  23 14.61   -5 15.3   1.657   2.339   120   16.0   3:09 (340, 48)  

* 6P/d'Arrest

Now it is 17.3 mag (June 29, Francois Kugel). 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)  
July  3  16 12.02   14 24.8   0.779   1.608   126   16.5  21:25 (  0, 69)  
July 10  16  9.88   12 14.5   0.765   1.568   122   16.0  21:00 (  3, 67)  

* C/2021 A1 ( Leonard )

Now it is 17.0 mag (June 16, 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)  
July  3  10 28.00   51 13.3   3.609   3.066    50   16.2  21:03 (133, 32)  
July 10  10 28.58   49 56.4   3.586   2.979    46   16.0  21:00 (133, 28)  

* C/2019 U5 ( PanSTARRS )

Now it is 16.3 mag (June 9, Ken-ichi Kadota). 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)  
July  3  17  0.03   50 21.3   6.175   6.478   102   16.1  22:12 (180, 75)  
July 10  16 51.06   49 49.1   6.161   6.434   101   16.1  21:36 (180, 75)  

* C/2020 S3 ( Erasmus )

It brightened up to 3 mag in December in the SOHO spacecraft images (Dec. 18, Hirohisa Sato). Now it is 15.6 mag (June 15, Michael Jager). 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)  
July  3   0 21.55   19 22.8   3.306   3.430    88   16.2   3:04 (284, 53)  
July 10   0 20.86   19 44.2   3.283   3.515    94   16.3   3:09 (292, 59)  

* C/2019 K7 ( Smith )

Now it is 16.0 mag (June 27, ATLAS-HKO, Haleakala). Fading slowly. 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)  
July  3  17 27.60   57 53.0   5.186   5.412    97   16.2  22:39 (180, 67)  
July 10  17 14.82   57 48.8   5.242   5.443    95   16.3  21:59 (180, 67)  

* 57P/du Toit-Neujmin-Delporte

Now it is 17.3 mag (June 13, Francois Kugel). 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)  
July  3  15  5.91  -13  3.3   1.189   1.972   126   16.3  21:03 ( 14, 41)  
July 10  15  7.91  -13 15.7   1.218   1.943   120   16.2  21:00 ( 21, 39)  

* C/2019 T3 ( ATLAS )

Now it is 16.6 mag (June 29, ATLAS-MLO, Mauna Loa). It is observable at 16 mag from 2020 to 2021. It locates low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3  23  8.45   45 16.4   5.927   6.009    89   16.3   3:04 (230, 71)  
July 10  23  3.97   45 18.3   5.842   6.016    94   16.3   3:09 (215, 77)  

* C/2019 O3 ( Palomar )

Now it is 16.2 mag (June 29, ATLAS-MLO, Mauna Loa). 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)  
July  3  19 10.71   50 56.2   8.513   8.845   105   16.4   0:27 (180, 74)  
July 10  19  4.99   51 17.6   8.508   8.849   106   16.4  23:50 (180, 74)  

* C/2021 K1 ( ATLAS )

Now it is 16.1 mag (June 17, ATLAS-HKO, Haleakala). 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)  
July  3   0 38.73   -3 45.8   2.291   2.564    93   16.4   3:04 (305, 34)  
July 10   0 46.78   -3 53.8   2.228   2.580    98   16.4   3:09 (311, 38)  

* 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 16.2 mag (June 20, ATLAS-HKO, Haleakala). 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)  
July  3  16 24.91  -46 35.4   4.232   5.080   142   16.4  21:38 (  0,  8)  
July 10  16 19.48  -46 28.9   4.352   5.142   136   16.6  21:06 (  0,  8)  

* C/2020 R7 ( ATLAS )

Now it is 17.1 mag (June 22, Thomas Lehmann). 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)  
July  3   3 45.08  -46 54.5   5.145   5.089    81   16.6   3:04 (311,-24)  
July 10   3 49.08  -48 11.0   5.037   5.040    84   16.5   3:09 (315,-21)  

* 17P/Holmes

Now it is 17.0 mag (June 24, Slooh.com Canary Islands Observatory). 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)  
July  3   3 24.65   33 30.0   2.911   2.315    45   16.6   3:04 (244, 23)  
July 10   3 38.99   34 45.0   2.879   2.338    48   16.7   3:09 (245, 27)  

* 108P/Ciffreo

Now it is 17.1 mag (June 10, J. L. Virlichie, P. Traverse, J. P. Desgrees). 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)  
July  3   2 32.38    7 38.0   2.009   1.794    63   16.9   3:04 (275, 20)  
July 10   2 49.38    9 19.0   1.938   1.769    65   16.6   3:09 (275, 24)  

* C/2020 V2 ( ZTF )

Now it is 16.6 mag (June 29, ATLAS-MLO, Mauna Loa). 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)  
July  3  12  0.68   37 29.4   7.248   6.919    67   16.7  21:03 (111, 44)  
July 10  12  0.69   37  7.5   7.283   6.865    62   16.7  21:00 (112, 40)  

* C/2017 Y2 ( PanSTARRS )

Now it is 16.4 mag (June 28, 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)  
July  3  15 44.13  -19 32.1   4.216   5.010   137   16.7  21:03 (  2, 35)  
July 10  15 36.59  -19 54.3   4.330   5.031   128   16.8  21:00 ( 11, 34)  

* 193P/LINEAR-NEAT

Now it is 18.1 mag (June 18, W. Hasubick). 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)  
July  3  23 26.69   -6 37.6   1.620   2.203   111   17.0   3:04 (326, 42)  
July 10  23 31.26   -5 34.5   1.544   2.194   116   16.9   3:09 (334, 46)  

* C/2020 K1 ( PanSTARRS )

Now it is 16.7 mag (June 25, ATLAS-MLO, Mauna Loa). It is expected to brighten up to 11 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)  
July  3  18  0.99   45 35.0   6.306   6.732   110   16.9  23:13 (180, 79)  
July 10  17 55.13   44 59.2   6.264   6.683   110   16.9  22:40 (180, 80)  

* 28P/Neujmin 1

Now it is 16.0 mag (June 25, Slooh.com Canary Islands Observatory). In the Northern Hemisphere, it stays observable in good condition after this while the comet will be fading. In the Southern Hemisphere, it stays locating extremely low for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3   3 25.24   27 25.1   2.632   2.056    45   16.9   3:04 (250, 20)  
July 10   3 39.35   28 46.2   2.627   2.106    49   17.0   3:09 (251, 24)  

* 19P/Borrelly

Now it is 18.6 mag (June 25, L. Buzzi, L. Demetz, N. Paul, A. Aletti). It will brighten rapidly up to 9 mag in winter. It will be observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3  23 52.64  -40 20.2   1.981   2.578   114   17.3   3:04 (336, 10)  
July 10  23 59.78  -41 46.9   1.877   2.528   118   16.9   3:09 (341, 10)  

* 22P/Kopff

Now it is 18.1 mag (June 29, Thomas Lehmann). 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)  
July  3  10 56.07   10 41.9   3.133   2.772    60   17.1  21:03 ( 89, 20)  
July 10  11  3.79    9 51.3   3.172   2.731    55   17.0  21:00 ( 91, 16)  

* C/2021 D2 ( ZTF )

Now it is 17.4 mag (June 21, ATLAS-MLO, Mauna Loa). 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)  
July  3  20 18.48   69 24.9   3.556   3.632    86   17.1   1:35 (180, 56)  
July 10  19 55.44   71 20.9   3.516   3.594    86   17.0   0:45 (180, 54)  

* 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)  
July  3   1  5.22   14  6.5   1.513   1.680    80   17.2   3:04 (283, 41)  
July 10   1 19.51   16 15.7   1.470   1.686    83   17.1   3:09 (283, 46)  

* C/2021 E3 ( ZTF )

Now it is 17.1 mag (June 27, ATLAS-HKO, Haleakala). 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)  
July  3  20 22.20   38 10.5   3.792   4.320   114   17.2   1:39 (180, 87)  
July 10  20 12.65   37 52.7   3.678   4.257   118   17.1   1:02 (180, 87)  

* C/2017 U7 ( PanSTARRS )

Now it is 16.8 mag (June 10, Toshihiko Ikemura, Hirohisa Sato). It will be fading slowly.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3  17 24.25  -12 24.4   6.830   7.779   157   17.2  22:37 (  0, 43)  
July 10  17 19.13  -12  7.9   6.906   7.805   150   17.3  22:05 (  0, 43)  

* 241P/LINEAR

Appearing in the morning sky. In the Northern Hemisphere, it stays observable at 17 mag in good condition until winter. In the Southern Hemisphere, it stays locating extremely low for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3   4  3.07   36  4.4   2.630   1.930    37   17.4   3:04 (238, 17)  
July 10   4 24.53   36 51.6   2.592   1.924    39   17.3   3:09 (238, 20)  

* C/2020 F2 ( ATLAS )

Now it is 17.4 mag (June 26, 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)  
July  3  14 28.69   -6  0.6   8.601   9.085   115   17.3  21:03 ( 29, 45)  
July 10  14 26.16   -5 48.8   8.705   9.076   108   17.4  21:00 ( 37, 42)  

* 413P/2020 W4 ( Larson )

First return of a new periodic comet which brightened up to 16 mag in 2014. Now it is 16.9 mag (June 5, Thomas Lehmann). 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)  
July  3  12 38.12   -3 58.0   1.900   2.144    89   17.4  21:03 ( 59, 30)  
July 10  12 46.45   -5 42.2   1.971   2.141    85   17.4  21:00 ( 61, 26)  

* C/2020 T4 ( PanSTARRS )

Now it is extremely faint as 20.5 mag (June 17, M. Jaeger, E. Prosperi, S. Prosperi). It was predicted to brighten up to 17.5 mag in 2021 summer. But actually, it is much fainter than predicted. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3   6 44.13   78 32.5   2.600   2.192    55   17.5   3:04 (189, 27)  
July 10   8 24.56   79  4.3   2.568   2.193    57   17.5  21:00 (168, 30)  

* 132P/Helin-Roman-Alu 2

Now it is 19.7 mag (June 12, Francois Kugel). It will brighten very rapidly up to 14 mag, and it will be observable in excellent condition in autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3  23 33.36    0 42.4   1.586   2.117   106   18.0   3:04 (319, 48)  
July 10  23 41.92    1 29.0   1.484   2.080   111   17.6   3:09 (326, 52)  

* 119P/Parker-Hartley

Now it is 20 mag (May 28, Giuseppe Pappa). It will brighten up to 14.5 mag in 2022 winter. In 2021, it stays observable in good condition while the comet will be brightening gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3  23  7.19  -12 20.2   2.833   3.427   117   17.8   3:04 (335, 39)  
July 10  23  8.21  -12 35.1   2.724   3.401   124   17.7   3:09 (344, 41)  

* 152P/Helin-Lawrence

Now it is 17.5 mag (June 14, Toshihiko Ikemura, Hirohisa Sato). 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)  
July  3  13 24.31    0 43.9   2.963   3.266    98   17.7  21:03 ( 52, 42)  
July 10  13 27.64   -0  3.2   3.046   3.254    92   17.7  21:00 ( 57, 38)  

* 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 17.7 mag (June 11, Catalina Sky Survey). It will be fainter than 18 mag in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3  11 34.32   -8  3.5   2.572   2.536    76   17.8  21:03 ( 67, 16)  
July 10  11 32.33   -9 35.1   2.724   2.565    70   18.0  21:00 ( 71, 10)  

* 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)  
July  3   0 50.16   19 20.8   8.110   8.033    82   17.9   3:04 (279, 47)  
July 10   0 50.30   19 49.2   8.041   8.076    88   17.9   3:09 (285, 54)  

* P/2021 L1 ( Christensen )

First return of a new periodic comet which brightened up to 17 mag in 2006. Now it is 17.4 mag (June 15, Taras Prystavski). It stays 18 mag from 2021 to 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July  3  22 50.82  -65 40.8   2.721   3.381   122   18.0   3:04 (353,-11)  
July 10  22 51.15  -66 41.8   2.682   3.362   124   17.9   3:09 (357,-12)  

* C/2020 K5 ( PanSTARRS )

It was expected to brighten up to 13 mag from spring to summer. But actually, it is extremely faint as 17.9 mag (Apr. 5, J. L. Virlichie, P. Traverse, J. P. Desgrees). 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)  
July  3   4 55.33  -32 45.8   1.783   1.582    61   19.4   3:04 (291,-31)  
July 10   5 13.09  -30 53.5   1.835   1.608    60   19.5   3:09 (290,-27)  

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