Weekly Information about Bright Comets (2021 July 17: North)

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Updated on July 21, 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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* 15P/Finlay

It brightened very rapidly. Now it is very bright as 10.8 mag (July 10, Carlos Labordena). 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 17   3 56.87   19 39.4   1.179   0.993    53   10.1   3:16 (261, 23)  
July 24   4 27.20   21 52.2   1.217   1.004    52    9.9   3:23 (260, 25)  

* C/2020 T2 ( Palomar )

Now it is very bright as 10.2 mag (July 11, Osamu Miyazaki). 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 17  14  7.15    2 44.4   1.715   2.056    94   10.1  20:55 ( 55, 43)  
July 24  14 15.88   -0 21.7   1.779   2.060    90   10.2  20:49 ( 55, 38)  

* 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 17   6 23.83   32 45.3   2.092   1.204    21   11.7   3:16 (231,  3)  
July 24   6 48.32   29 13.2   2.039   1.154    21   11.2   3:23 (235,  2)  

* 4P/Faye

Now it is 12.3 mag (July 8, 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 17   2 41.74   16 18.4   1.738   1.709    71   11.6   3:16 (275, 36)  
July 24   3  1.15   17 10.6   1.672   1.688    73   11.4   3:23 (277, 40)  

* 7P/Pons-Winnecke

Now it is very bright as 11.2 mag (July 12, Chris Wyatt). 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 17  23 53.43  -40 48.1   0.522   1.381   124   11.5   3:16 (349, 13)  
July 24   0  2.14  -43 58.0   0.554   1.420   127   11.6   3:23 (354, 11)  

* 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 17   5 43.96   48 32.5   4.669   3.898    36   12.1   3:16 (223, 18)  
July 24   5 56.27   48  9.5   4.604   3.873    39   12.0   3:23 (225, 21)  

* C/2017 K2 ( PanSTARRS )

Now it is 13.5 mag (July 12, Chris Wyatt). 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 17  17 19.30   40 50.9   5.435   5.850   109   12.3  21:37 (180, 84)  
July 24  17 14.01   39 51.8   5.410   5.791   107   12.3  21:04 (180, 85)  

* 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 13.6 mag (July 12, Chris Wyatt). It stays observable in good condition for a long time after this while the comet will fading.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 17   3 32.02    8 11.0   2.066   1.828    62   13.5   3:16 (275, 22)  
July 24   3 45.03    8 33.4   2.046   1.870    65   13.6   3:23 (278, 26)  

* 246P/NEAT

Now it is 13.8 mag (July 6, Chris Wyatt). 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 17  18 59.51  -34 15.8   1.979   2.967   163   13.8  23:17 (  0, 21)  
July 24  18 54.42  -34 44.6   2.015   2.977   157   13.8  22:45 (  0, 20)  

* C/2019 T4 ( ATLAS )

Now it is 14.6 mag (July 12, Chris Wyatt). It is expected to brighten up to 11.5 mag in 2022. In the Southern Hemisphere, it stas observable in good condition for a long time, although it becomes extremely low temporarily from August to September. 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 17   9 17.56  -22 29.6   5.625   5.021    49   13.9  20:55 ( 81,-28)  
July 24   9 25.15  -22 20.5   5.646   4.991    45   13.8  20:49 ( 83,-31)  

* C/2020 J1 ( SONEAR )

Now it is bright as 13.4 mag (July 12, Chris Wyatt). 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 17  13 46.48   -9 51.7   3.237   3.458    93   13.8  20:55 ( 50, 30)  
July 24  13 43.63   -8 38.6   3.392   3.475    86   14.0  20:49 ( 56, 27)  

* 29P/Schwassmann-Wachmann 1

Appearing in the morning sky. Now it is faint as 16.5 mag (July 15, Jean-Francois Soulier).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 17   4 24.73   29 39.7   6.562   5.897    45   13.9   3:16 (248, 22)  
July 24   4 29.81   29 54.9   6.483   5.898    51   13.8   3:23 (251, 28)  

* 67P/Churyumov-Gerasimenko

Now it is 15.0 mag (July 12, Chris Wyatt). 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 17   1  2.79    1 55.8   1.286   1.761    99   14.5   3:16 (311, 46)  
July 24   1 18.18    3 27.0   1.183   1.708   101   14.1   3:23 (315, 50)  

* 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 17  19 27.65   31 37.4   1.673   2.424   126   14.3  23:42 (  0, 87)  
July 24  18 54.01   32 33.4   1.678   2.401   124   14.2  22:42 (  0, 88)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 14.8 mag (July 12, 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 17   0 17.72  -86 34.5   3.089   3.602   112   14.6   3:16 (359,-32)  
July 24   0 15.34  -87  7.4   3.111   3.607   111   14.6   3:23 (359,-32)  

* C/2020 F5 ( MASTER )

Now it is 14.9 mag (July 12, Chris Wyatt). 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 17  23 38.50  -34 12.4   3.737   4.429   127   14.6   3:16 (350, 20)  
July 24  23 34.93  -34  8.1   3.682   4.441   133   14.6   3:23 (359, 21)  

* C/2018 U1 ( Lemmon )

Now it is 15.0 mag (July 5, Chris Wyatt). 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 17  16 48.31   -7 39.2   4.290   5.063   135   14.7  21:06 (  0, 47)  
July 24  16 42.16   -8 41.4   4.366   5.054   127   14.7  20:49 (  6, 46)  

* 6P/d'Arrest

Now it is 16.7 mag (July 11, Ken-ichi Kadota). 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 17  16  9.83    9 36.4   0.756   1.531   118   15.5  20:55 ( 15, 64)  
July 24  16 12.09    6 34.7   0.750   1.497   115   15.0  20:49 ( 23, 59)  

* 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 17   8 19.81  -64 12.0   2.681   2.795    85   15.1  20:55 ( 31,-46)  
July 24   8 50.13  -62 22.8   2.764   2.820    82   15.2  20:49 ( 34,-45)  

* C/2021 A7 ( NEOWISE )

It brightened up to 14.2 mag in early summer (June 10, Thomas Lehmann). Now it is not observable. It will be fading after this. 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 17   9 29.40   12 36.4   2.826   1.968    26   15.2  20:55 (110, -6)  
July 24   9 43.04   14  0.9   2.872   1.971    22   15.2  20:49 (112, -6)  

* C/2020 M5 ( ATLAS )

Now it is 15.8 mag (June 30, Thomas Lehmann). 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 17  12 22.63   57 21.7   3.379   3.023    61   15.4  20:55 (138, 43)  
July 24  12 22.47   54  9.1   3.431   3.016    57   15.4  20:49 (134, 40)  

* 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 17   3 43.81   12  0.4   1.844   1.568    58   15.5   3:16 (270, 21)  
July 24   4  3.31   14  4.9   1.795   1.553    59   15.4   3:23 (270, 26)  

* 117P/Helin-Roman-Alu 1

Now it is 15.8 mag (July 10, 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 17  13 10.68   -3 34.3   3.444   3.476    83   15.4  20:55 ( 62, 28)  
July 24  13 15.19   -4 18.3   3.527   3.461    77   15.4  20:49 ( 65, 25)  

* 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 17   5 27.49  -54 33.4   3.247   3.253    81   15.4   3:16 (317,-32)  
July 24   5 30.33  -55 31.6   3.286   3.318    82   15.5   3:23 (320,-28)  

* 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 17  16 35.98  -16 35.5   4.099   4.874   135   15.6  20:55 (  0, 38)  
July 24  16 33.33  -15 35.7   4.182   4.870   127   15.7  20:49 (  8, 39)  

* 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 17  10 30.05   48 41.3   3.554   2.890    42   15.9  20:55 (133, 25)  
July 24  10 32.26   47 28.3   3.511   2.801    39   15.7  20:49 (134, 21)  

* 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 17  23 18.56   -5 35.7   1.582   2.330   126   15.8   3:16 (351, 49)  
July 24  23 21.43   -6  6.8   1.514   2.323   132   15.7   3:15 (  0, 49)  

* 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 will be unobservable soon.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 17  12  0.25  -21  6.6   4.586   4.439    75   15.8  20:55 ( 61,  4)  
July 24  12  0.13  -21 28.0   4.651   4.395    69   15.8  20:49 ( 64,  0)  

* 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 17  13 39.57    0 25.1   4.657   4.741    88   16.0  20:55 ( 60, 36)  
July 24  13 41.43    0 58.0   4.764   4.735    82   16.0  20:49 ( 64, 33)  

* C/2019 U5 ( PanSTARRS )

Now it is 16.7 mag (July 1, Thomas Lehmann). 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 17  16 42.73   49  8.0   6.154   6.389    98   16.0  21:00 (180, 76)  
July 24  16 35.16   48 19.1   6.154   6.345    96   16.0  20:49 (164, 76)  

* 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 17  15 11.70  -13 36.3   1.252   1.915   114   16.1  20:55 ( 26, 37)  
July 24  15 17.16  -14  4.1   1.288   1.889   109   16.0  20:49 ( 30, 35)  

* 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 17  13 29.97   56 31.6   6.577   6.308    70   16.1  20:55 (139, 52)  
July 24  13 30.68   55 10.3   6.671   6.357    67   16.1  20:49 (136, 50)  

* 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 17   3  6.57   10 57.7   1.869   1.747    67   16.4   3:16 (277, 28)  
July 24   3 24.02   12 33.9   1.802   1.727    69   16.2   3:23 (278, 33)  

* 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 17   0  6.00  -43 23.0   1.781   2.477   122   16.6   3:16 (347, 10)  
July 24   0 11.24  -45  8.9   1.692   2.425   125   16.3   3:23 (353,  9)  

* 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 17  22 58.74   45 14.2   5.759   6.023   100   16.3   3:16 (184, 80)  
July 24  22 52.83   45  3.1   5.679   6.031   105   16.3   2:47 (180, 80)  

* 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 16.0 mag (July 8, 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 17  10 58.18   14 30.6   2.901   2.318    46   16.3  20:55 ( 99, 13)  
July 24  11  0.61   13 44.2   3.081   2.400    40   16.6  20:49 (101,  8)  

* 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 17  17  2.97   57 32.4   5.303   5.474    94   16.3  21:20 (180, 68)  
July 24  16 52.29   57  5.5   5.369   5.505    92   16.4  20:49 (178, 68)  

* 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 17   0 19.23   19 59.6   3.260   3.600   101   16.4   3:16 (303, 66)  
July 24   0 16.68   20  8.5   3.238   3.684   108   16.4   3:23 (321, 72)  

* C/2020 R7 ( ATLAS )

Now it is 16.9 mag (July 7, 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 17   3 52.75  -49 36.9   4.931   4.991    87   16.4   3:16 (319,-17)  
July 24   3 55.99  -51 12.3   4.827   4.942    90   16.4   3:23 (324,-14)  

* 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 17  18 59.22   51 32.5   8.509   8.852   106   16.4  23:16 (180, 73)  
July 24  18 53.52   51 41.1   8.517   8.856   106   16.4  22:43 (180, 73)  

* 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 17   0 54.00   -4  9.8   2.167   2.598   103   16.4   3:16 (318, 42)  
July 24   1  0.34   -4 33.8   2.109   2.617   108   16.4   3:23 (327, 45)  

* 2004 XM199

Announced as a bright Centaur-type asteroid. But Hidetaka Sato revealed that this is Phoebe, one of the satellites of Saturn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 17  20 56.44  -18  4.1   8.894   9.870   162   16.5   1:18 (  0, 37)  
July 24  20 54.57  -18 12.8   8.869   9.871   170   16.5   0:49 (  0, 37)  

* 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 17  23 34.62   -4 35.0   1.472   2.187   121   16.7   3:16 (345, 49)  
July 24  23 36.69   -3 39.4   1.405   2.181   127   16.5   3:23 (357, 51)  

* 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 17  12  1.19   36 45.0   7.311   6.812    57   16.7  20:55 (113, 35)  
July 24  12  2.14   36 22.4   7.331   6.758    52   16.6  20:49 (115, 32)  

* 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 16.8 mag (July 9, Thomas Lehmann). 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 17  16 15.06  -46 19.7   4.482   5.204   130   16.7  20:55 (  4,  8)  
July 24  16 11.66  -46  8.8   4.622   5.266   124   16.8  20:49 (  8,  8)  

* 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 17  11 12.05    8 57.1   3.206   2.689    51   16.9  20:55 ( 92, 12)  
July 24  11 20.80    7 59.4   3.235   2.647    46   16.7  20:49 ( 93,  9)  

* 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 17  17 49.57   44 15.1   6.228   6.635   109   16.8  22:07 (180, 81)  
July 24  17 44.42   43 23.1   6.200   6.587   108   16.8  21:34 (180, 82)  

* 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. Thomas Lehmann reported it was bright as 15.0 mag on July 9.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 17   3 53.14   35 55.3   2.843   2.361    52   16.8   3:16 (245, 31)  
July 24   4  7.04   37  1.2   2.805   2.386    55   17.0   3:23 (246, 35)  

* 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 17  19 26.83   72 52.8   3.482   3.556    85   16.9  23:41 (180, 52)  
July 24  18 53.45   73 54.7   3.454   3.519    85   16.9  22:40 (180, 51)  

* 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 17  20  2.42   37 19.4   3.575   4.194   121   17.0   0:24 (180, 88)  
July 24  19 51.71   36 29.0   3.484   4.131   123   16.9  23:41 (180, 89)  

* 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 17  23 49.98    2 10.2   1.386   2.044   115   17.2   3:16 (335, 55)  
July 24  23 57.46    2 44.9   1.293   2.009   120   16.9   3:23 (347, 57)  

* C/2017 Y2 ( PanSTARRS )

Now it is 16.4 mag (June 28, ATLAS-HKO, Haleakala). It will be fading after this, and it will be fainter than 18 mag in October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 17  15 30.00  -20 16.2   4.456   5.053   120   16.9  20:55 ( 19, 32)  
July 24  15 24.39  -20 38.1   4.592   5.075   112   17.0  20:49 ( 25, 30)  

* 402P/2020 Q3 ( LINEAR )

First return of a new periodic comet observed at 16 mag from 2003 to 2004. Now it is 16.8 mag (Apr. 11, J. Drummond). It will brighten up to 16 mag in winter, and it will be observable in excellent condition. It will be getting higher gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 17   5 24.49    2  9.5   4.767   4.031    39   17.0   3:16 (264, -5)  
July 24   5 32.28    2 18.0   4.705   4.023    43   16.9   3:23 (268,  1)  

* 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 17   3 52.94   30  1.3   2.619   2.156    52   17.0   3:16 (252, 28)  
July 24   4  5.94   31 10.8   2.606   2.208    56   17.1   3:23 (253, 33)  

* 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 17   1 33.25   18 19.5   1.429   1.696    86   17.1   3:16 (285, 51)  
July 24   1 46.34   20 17.1   1.388   1.708    89   17.0   3:23 (287, 57)  

* 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 17   4 46.16   37 27.0   2.554   1.919    41   17.3   3:16 (239, 22)  
July 24   5  7.81   37 50.3   2.517   1.918    43   17.2   3:23 (240, 24)  

* 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 17  17 14.36  -11 52.9   6.997   7.830   142   17.3  21:32 (  0, 43)  
July 24  17  9.99  -11 39.3   7.101   7.856   135   17.4  21:01 (  0, 43)  

* 88P/Howell

It brightened up to 8.2 mag in 2020 autumn (Oct. 13, 2020, Chris Wyatt). It is observable at 18 mag in 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 17   4 22.30   21 17.3   3.552   2.954    47   17.4   3:16 (256, 18)  
July 24   4 30.72   21 40.2   3.516   2.994    51   17.5   3:23 (259, 24)  

* 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 17  14 24.02   -5 39.2   8.815   9.066   101   17.4  20:55 ( 44, 39)  
July 24  14 22.27   -5 31.7   8.928   9.057    94   17.4  20:49 ( 50, 35)  

* 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 17  23  8.36  -12 55.8   2.621   3.375   130   17.5   3:16 (355, 42)  
July 24  23  7.60  -13 22.3   2.526   3.349   137   17.4   3:01 (  0, 42)  

* 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 17  10  1.65   77 42.1   2.544   2.196    58   17.4  20:55 (165, 33)  
July 24  11 14.36   74 49.4   2.530   2.203    59   17.4  20:49 (161, 35)  

* P/2021 L5 ( La Sagra )

First return of a new periodic comet which brightened up to 17 mag in 2012. Now it is 18.3 mag (June 30, ATLAS-MLO, Mauna Loa). In the Southern Hemisphere, it is observable at 17.5 mag in excellent condition in summer. It locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 17  19 59.50  -37 59.0   0.853   1.848   162   17.6   0:22 (  0, 17)  
July 24  19 53.49  -39 10.0   0.809   1.798   160   17.5  23:44 (  0, 16)  

* 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 (July 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 17  12 55.54   -7 27.0   2.043   2.140    81   17.5  20:55 ( 62, 23)  
July 24  13  5.33   -9 11.7   2.115   2.140    77   17.6  20:49 ( 62, 20)  

* 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 17  13 31.71   -0 53.4   3.129   3.243    87   17.8  20:55 ( 60, 34)  
July 24  13 36.49   -1 46.3   3.213   3.232    82   17.8  20:49 ( 63, 30)  

* P/2021 N2 ( Fuls )

Now it is 17.8 mag (July 11, N. Paul). It is observable at 17 mag in good condition in autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 17   2  6.90   17 49.6   3.946   3.877    78   17.9   3:16 (279, 44)  
July 24   2 12.21   18  9.6   3.841   3.871    84   17.8   3:23 (284, 50)  

* 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 17  22 49.20  -67 38.0   2.650   3.345   125   17.9   3:11 (  0,-12)  
July 24  22 44.90  -68 26.9   2.626   3.328   126   17.8   2:39 (  0,-13)  

* 378P/2019 E2 ( McNaught )

It brightened up to 18.5 mag in 2020 spring (Apr. 2, 2020, W. Hasubick). It has passed the perihelion in 2020 October. At the discovery in 2005, it stayed bright for several years even after the perihelion passage. In this apparition, it may stay observable at 18 mag from 2021 to 2024.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 17  23 50.91  -23 22.8   3.122   3.780   123   17.9   3:16 (345, 30)  
July 24  23 51.40  -24  5.0   3.070   3.799   129   17.9   3:23 (354, 31)  

* 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 17   0 50.04   20 15.8   7.972   8.120    94   17.9   3:16 (292, 61)  
July 24   0 49.38   20 40.2   7.905   8.163   101   17.9   3:23 (304, 67)  

* 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 17   5 28.57  -29 13.7   1.886   1.639    60   19.6   3:16 (291,-23)  
July 24   5 42.08  -27 46.3   1.931   1.674    60   19.7   3:23 (292,-18)  

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