Weekly Information about Bright Comets (2021 Aug. 28: North)

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Updated on August 28, 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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* 8P/Tuttle

It brightened very rapidly. Now it is 11.0 mag (Aug. 18, Ken-ichi Kadota). It will brighten up to 8.5 mag from September to October. But the condition is bad in this apparition. In the Southern Hemisphere, it stays observable after this while the comet will be fading. But it stays locating low. It is not observable after this in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28   8 42.81    5 25.4   1.835   1.026    25    9.1   4:00 (263,  0)  
Sept. 4   9  5.34   -0 13.0   1.816   1.032    27    8.8   4:07 (269, -1)  

* C/2021 O1 ( Nishimura )

It was observed at 9-10 mag from late July to early August. Now it is not observable. It will appear in the morning sky in December, but it will be fainter than 15 mag at that time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  10 28.21   22 43.9   1.786   0.833    12    9.5  20:00 (125, -9)  
Sept. 4  11  3.47   18 48.0   1.848   0.885    11    9.8  19:49 (119, -8)  

* 4P/Faye

Now it is 11.3 mag (Aug. 18, Osamu Miyazaki). It stays observable at 10-11 mag in excellent condition from summer to autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28   4 39.22   18 55.6   1.386   1.623    83   10.6   4:00 (290, 56)  
Sept. 4   4 57.98   18 42.2   1.338   1.620    86   10.5   4:07 (294, 59)  

* 15P/Finlay

It brightened very rapidly. Now it is very bright as 11.1 mag (Aug. 6, Carlos Labordena). It will be fading after this. 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)  
Aug. 28   6 39.56   26 50.4   1.408   1.186    55   10.8   4:00 (260, 36)  
Sept. 4   7  1.22   26 58.1   1.437   1.241    57   11.2   4:07 (261, 38)  

* C/2020 T2 ( Palomar )

Now it is very bright as 10.9 mag (Aug. 13, Chris Wyatt). It will be fading after this. In the Northern Hemisphere, it will be getting lower gradually in the evening. In the Southern Hemisphere, it stays observable in good condition for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  15 10.61  -14  9.6   2.167   2.132    74   10.9  20:00 ( 52, 22)  
Sept. 4  15 23.39  -16 29.6   2.256   2.156    71   11.1  19:49 ( 51, 20)  

* 252P/LINEAR

It brightened up to 4 mag in major outburst in 2016. In this apparition, it brightened up to 10.5 mag in early August (Aug. 8, Rob Kaufman). Now it is 12.8 mag (Aug. 18, Ken-ichi Kadota). In the Southern Hemisphere, it stays locating low in the evening sky until October. In the Northern Hemisphere, it stays locating extremely low.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  13  0.61   -1 52.9   1.777   1.199    40   11.2  20:00 ( 83,  6)  
Sept. 4  13 28.10   -4  0.7   1.829   1.251    40   11.6  19:49 ( 80,  7)  

* C/2019 L3 ( ATLAS )

Now it is 11.6 mag (Aug. 18, Osamu Miyazaki). 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. In the Southern Hemisphere, it is not observable until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28   6 51.31   45 49.2   4.195   3.759    58   11.7   4:00 (236, 40)  
Sept. 4   7  0.68   45 17.2   4.098   3.739    62   11.6   4:07 (238, 44)  

* 67P/Churyumov-Gerasimenko

Now it is 12.7 mag (Aug. 25, Ken-ichi Kadota). 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)  
Aug. 28   2 50.20   12  3.0   0.750   1.457   110   12.3   4:00 (345, 66)  
Sept. 4   3 12.94   13 59.2   0.684   1.413   111   11.9   4:07 (351, 69)  

* C/2017 K2 ( PanSTARRS )

Now it is 12.5 mag (Aug. 18, Ken-ichi Kadota). 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 autumn to 2023 summer. In the Southern Hemisphere, it stays 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)  
Aug. 28  16 57.92   33 27.4   5.381   5.495    91   12.1  20:00 ( 91, 71)  
Sept. 4  16 56.95   32  0.5   5.388   5.435    87   12.0  19:49 ( 90, 67)  

* 6P/d'Arrest

Now it is 12.8 mag (Aug. 7, Thomas Lehmann). 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)  
Aug. 28  17  0.24  -11 54.4   0.771   1.376   100   12.5  20:00 ( 27, 39)  
Sept. 4  17 17.26  -15 40.2   0.786   1.364    98   12.0  19:49 ( 25, 35)  

* 7P/Pons-Winnecke

It brightened up to 9.7 mag in June (June 4, Michael Jager). Now it is fading. It has already faded down to 12.8 mag (Aug. 13, Chris Wyatt). In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it becomes extremely low after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  23 50.64  -51 59.3   0.778   1.651   134   12.9   1:27 (  0,  3)  
Sept. 4  23 42.23  -51 54.3   0.838   1.702   134   13.2   0:51 (  0,  3)  

* 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)  
Aug. 28  10  4.39  -22 35.0   5.667   4.849    32   13.6   4:00 (276,-33)  
Sept. 4  10 12.32  -22 48.3   5.652   4.822    31   13.6   4:07 (280,-27)  

* 29P/Schwassmann-Wachmann 1

Outburst occured on Aug. 25. Now it is 14.4 mag (Aug. 26, Jean-Francois Soulier).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28   4 49.99   31  2.4   6.002   5.908    79   13.7   4:00 (267, 59)  
Sept. 4   4 52.69   31 14.3   5.895   5.910    85   13.6   4:07 (271, 66)  

* 19P/Borrelly

Now it is 16.0 mag (Aug. 17, Thomas Lehmann). It will brighten rapidly up to 9 mag in winter. It will be observable in good condition. In the Southern Hemisphere, it is observable in excellent condition. In the Northren Hemisphere, it is not observable until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28   0 13.23  -54 51.0   1.370   2.165   130   14.6   1:49 (  0,  0)  
Sept. 4   0  7.15  -56 27.4   1.330   2.112   128   14.2   1:16 (  0, -1)  

* 246P/NEAT

Now it is 14.5 mag (Aug. 10, 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 low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  18 43.76  -35 35.7   2.355   3.032   123   14.3  20:17 (  0, 19)  
Sept. 4  18 45.30  -35 32.2   2.447   3.044   117   14.4  19:51 (  0, 19)  

* 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 14.8 mag (Aug. 10, 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)  
Aug. 28   4 35.85    8 52.3   1.895   2.085    86   14.3   4:00 (303, 50)  
Sept. 4   4 42.65    8 40.2   1.857   2.129    91   14.5   4:07 (312, 55)  

* C/2020 PV6 ( PanSTARRS )

Now it is 14.0 mag (Aug. 18, Ken-ichi Kadota). It stays 14 mag until October, and it is observable in good condition. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  16 49.80   27 30.4   2.074   2.318    90   14.4  20:00 ( 77, 68)  
Sept. 4  16 36.99   25 53.2   2.192   2.308    83   14.5  19:49 ( 80, 61)  

* C/2021 A1 ( Leonard )

Now it is 16.2 mag (July 30, Thomas Lehmann). 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, although it becomes extremely low temporarily in September. In the Southern Hemisphere, it is not observable until mid December.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  10 51.46   41 58.9   3.124   2.337    32   14.7  20:00 (137,  8)  
Sept. 4  10 56.48   41  0.8   3.009   2.241    33   14.4  19:49 (137,  6)  

* C/2020 J1 ( SONEAR )

Now it is 13.9 mag (Aug. 18, Ken-ichi Kadota). It will be getting lower rapidly after this, and it will be unobservable in September.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  13 42.94   -4 49.2   4.118   3.573    51   14.6  20:00 ( 75, 12)  
Sept. 4  13 44.66   -4 21.3   4.240   3.595    44   14.7  19:49 ( 77, 10)  

* 17P/Holmes

Outburst occured in early August. Now it is very bright as 14.6 mag (Aug. 18, Ken-ichi Kadota). In the Northern Hemisphere, it stays observable in good condition. 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)  
Aug. 28   5  9.92   41 35.5   2.574   2.515    75   14.6   4:00 (246, 57)  
Sept. 4   5 20.50   42 22.4   2.520   2.542    79   14.7   4:07 (244, 62)  

* C/2020 F5 ( MASTER )

Now it is 14.4 mag (Aug. 10, 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)  
Aug. 28  23  6.59  -33  3.2   3.580   4.515   154   14.6   0:43 (  0, 22)  
Sept. 4  22 59.93  -32 34.3   3.600   4.532   154   14.6   0:09 (  0, 23)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 15.0 mag (Aug. 13, 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)  
Aug. 28  20 54.83  -86 19.5   3.280   3.645   103   14.9  22:31 (  0,-31)  
Sept. 4  20 42.84  -85 19.1   3.323   3.656   101   14.9  21:52 (  0,-30)  

* 132P/Helin-Roman-Alu 2

Now it is 17.1 mag (Aug. 17, Thomas Lehmann). 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)  
Aug. 28   0 22.52    3 18.8   0.916   1.853   148   15.2   1:58 (  0, 58)  
Sept. 4   0 24.39    2 50.4   0.863   1.827   154   14.9   1:33 (  0, 58)  

* C/2018 U1 ( Lemmon )

Now it is 15.2 mag (Aug. 13, 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)  
Aug. 28  16 23.01  -13 46.2   4.888   5.020    91   15.0  20:00 ( 37, 33)  
Sept. 4  16 21.50  -14 44.1   5.006   5.014    84   15.0  19:49 ( 40, 30)  

* 106P/Schuster

Now it is 15.6 mag (July 16, Ken-ichi Kadota). It stays 15 mag from summer to autumn. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it will be getting lower gradually after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28   5 44.30   23 18.1   1.586   1.532    68   15.3   4:00 (271, 45)  
Sept. 4   6  4.73   24 51.7   1.550   1.538    70   15.3   4:07 (271, 49)  

* 108P/Ciffreo

Now it is 15.5 mag (July 27, Ken-ichi Kadota). 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)  
Aug. 28   4 52.96   19 40.3   1.503   1.665    80   15.4   4:00 (285, 54)  
Sept. 4   5 10.54   20 53.3   1.450   1.661    82   15.3   4:07 (287, 58)  

* 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)  
Aug. 28  10 52.95   19 36.5   3.017   2.039    11   15.5  20:00 (119, -7)  
Sept. 4  11  7.36   20 32.8   3.028   2.063    13   15.6  19:49 (120, -6)  

* C/2020 M5 ( ATLAS )

Now it is 15.7 mag (Aug. 11, 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)  
Aug. 28  12 34.38   40 10.0   3.685   3.005    41   15.5  20:00 (124, 23)  
Sept. 4  12 38.01   37 47.5   3.726   3.008    38   15.5  19:49 (123, 19)  

* 117P/Helin-Roman-Alu 1

Now it is 15.8 mag (Aug. 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)  
Aug. 28  13 45.84   -8 29.3   3.901   3.391    53   15.5  20:00 ( 71, 11)  
Sept. 4  13 53.34   -9 23.4   3.963   3.377    48   15.5  19:49 ( 72,  8)  

* 57P/du Toit-Neujmin-Delporte

Now it is 16.7 mag (July 17, Ken-ichi Kadota). 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)  
Aug. 28  16  7.01  -17 26.6   1.495   1.782    88   15.6  20:00 ( 38, 28)  
Sept. 4  16 20.83  -18 10.1   1.539   1.766    85   15.6  19:49 ( 38, 27)  

* C/2020 Y2 ( ATLAS )

Now it is 16.3 mag (July 25, J. L. Virlichie, P. Traverse, H. Roy, J. P. Desgrees). 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, although it becomes extremely low temporarily from September to October. In the Northern Hemisphere, it is not observable for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  12  7.02  -24 23.5   4.875   4.182    42   15.7  20:00 ( 72,-18)  
Sept. 4  12  9.53  -25 12.4   4.893   4.141    37   15.6  19:49 ( 73,-21)  

* C/2019 U5 ( PanSTARRS )

Now it is 16.3 mag (Aug. 11, 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)  
Aug. 28  16 10.49   43  1.2   6.209   6.124    80   15.8  20:00 (117, 62)  
Sept. 4  16  8.14   41 51.5   6.225   6.080    77   15.7  19:49 (114, 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)  
Aug. 28  10 27.32  -54 57.1   3.250   2.964    64   15.8  20:00 ( 44,-45)  
Sept. 4  10 40.35  -53 59.7   3.347   2.997    61   15.9   4:07 (314,-42)  

* 22P/Kopff

Now it is not observable. In the Southern Hemisphere, it will appear in the morning sky at 11 mag in late January, then it stays observable at 11 mag until June. In the Northern Hemisphere, it will appear in the morning sky in December, but it stays locating extremely low for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  12 11.15    2 25.3   3.290   2.435    27   16.0  20:00 ( 94, -2)  
Sept. 4  12 22.46    1 10.6   3.283   2.393    23   15.8  19:49 ( 94, -4)  

* C/2020 R7 ( ATLAS )

Now it is 16.4 mag (Aug. 20, 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)  
Aug. 28   4  0.03  -61 14.1   4.391   4.701   101   15.9   4:00 (349, -8)  
Sept. 4   3 56.48  -63 32.2   4.328   4.654   102   15.9   4:07 (354, -9)  

* C/2020 O2 ( Amaral )

Now it is 15.7 mag (July 17, Toshiyuki Takahashi). 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)  
Aug. 28  16 30.85  -11 41.9   4.701   4.862    93   15.9  20:00 ( 36, 36)  
Sept. 4  16 32.36  -11  6.8   4.814   4.862    86   15.9  19:49 ( 40, 34)  

* 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 15.4 mag (Aug. 20, 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)  
Aug. 28   5 25.89  -62 20.5   3.468   3.644    91   15.9   4:00 (340,-14)  
Sept. 4   5 19.37  -63 54.4   3.509   3.709    93   16.0   4:07 (345,-13)  

* 284P/McNaught

Now it is 15.4 mag (Aug. 12, Michael Jager). It stays observable at 16 mag in good condition until autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  23 19.02  -11  6.6   1.303   2.298   166   16.0   0:55 (  0, 44)  
Sept. 4  23 15.91  -12 21.7   1.293   2.296   172   16.0   0:25 (  0, 43)  

* 104P/Kowal 2

Now it is 19.4 mag (Aug. 12, Thomas Lehmann). It will brightens rapidly. And it is expected to be observable at 10-11 mag in good condition from December to February.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  22 30.07    0 20.0   0.960   1.963   169   16.6   0:07 (  0, 55)  
Sept. 4  22 21.89   -0 31.6   0.902   1.903   170   16.2  23:26 (  0, 54)  

* C/2020 H6 ( ATLAS )

Now it is 16.0 mag (July 18, Ken-ichi Kadota). It stays observable at 16 mag from 2021 to 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  13 57.96    2 43.0   5.247   4.711    53   16.2  20:00 ( 79, 20)  
Sept. 4  14  2.46    2 56.2   5.326   4.708    47   16.2  19:49 ( 81, 18)  

* C/2019 T3 ( ATLAS )

Now it is 16.0 mag (July 23, 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)  
Aug. 28  22 17.11   41 53.8   5.400   6.077   128   16.3  23:49 (180, 83)  
Sept. 4  22  9.85   40 47.1   5.378   6.088   130   16.3  23:14 (180, 84)  

* C/2021 E3 ( ZTF )

Now it is 16.1 mag (Aug. 2, F. Kugel, J.-G. Bosch). 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)  
Aug. 28  19  1.97   28  3.5   3.235   3.813   117   16.4  20:34 (  0, 83)  
Sept. 4  18 54.59   25 43.7   3.228   3.749   113   16.3  19:59 (  0, 81)  

* 110P/Hartley 3

Now it is 18.0 mag (Aug. 1, Palomar Mountain--ZTF). It will brightens rapidly. And it will be observable at 15 mag in excellent condition in winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28   6 45.00   27 37.2   2.917   2.476    54   16.5   4:00 (258, 35)  
Sept. 4   6 58.00   27  9.2   2.842   2.471    58   16.4   4:07 (261, 39)  

* C/2018 N2 ( ASASSN )

Now it is 16.0 mag (July 20, Thomas Lehmann). 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)  
Aug. 28  13 42.59   48 59.4   7.100   6.597    56   16.4  20:00 (128, 37)  
Sept. 4  13 46.12   47 54.9   7.174   6.645    54   16.4  19:49 (128, 35)  

* C/2021 K1 ( ATLAS )

Now it is 15.1 mag (Aug. 18, Ken-ichi Kadota). It will be fading after this, and it will be fainter than 18 mag in November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28   1 16.36   -8 25.0   1.900   2.735   137   16.5   2:52 (  0, 47)  
Sept. 4   1 16.27   -9 26.3   1.882   2.763   144   16.6   2:25 (  0, 46)  

* C/2019 O3 ( Palomar )

Now it is 16.4 mag (Aug. 2, 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)  
Aug. 28  18 29.76   51  1.5   8.632   8.876   100   16.5  20:02 (180, 74)  
Sept. 4  18 26.51   50 41.5   8.668   8.881    98   16.6  19:49 (170, 74)  

* C/2021 D2 ( ZTF )

Now it is 17.1 mag (Aug. 2, 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)  
Aug. 28  16 22.22   71 39.2   3.363   3.346    80   16.6  20:00 (165, 50)  
Sept. 4  16  6.32   70 21.3   3.349   3.315    79   16.5  19:49 (161, 49)  

* C/2020 K1 ( PanSTARRS )

Now it is 16.8 mag (July 18, Toshihiko Ikemura, Hirohisa Sato). 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)  
Aug. 28  17 27.61   37 34.7   6.159   6.344    95   16.6  20:00 (106, 78)  
Sept. 4  17 26.28   36 14.2   6.168   6.296    92   16.5  19:49 (100, 74)  

* 52P/Harrington-Abell

It stays observable at 16 mag from autumn to winter. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it stays extremely low until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28   8  3.20   26 57.1   2.504   1.814    37   16.6   4:00 (250, 19)  
Sept. 4   8 23.06   25 47.1   2.456   1.802    39   16.6   4:07 (253, 21)  

* 193P/LINEAR-NEAT

Now it is 16.6 mag (Aug. 18, Ken-ichi Kadota). It stays observable at 16.5 mag in good condition until October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  23 26.53   -0 15.8   1.184   2.168   162   16.6   1:03 (  0, 55)  
Sept. 4  23 21.18    0  8.9   1.170   2.169   169   16.6   0:30 (  0, 55)  

* 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.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28   6  7.57    2 17.2   4.315   3.987    64   16.7   4:00 (289, 29)  
Sept. 4   6 13.59    2  9.8   4.223   3.981    69   16.6   4:07 (295, 34)  

* 119P/Parker-Hartley

Now it is 18.9 mag (Aug. 3, ATLAS-HKO, Haleakala). 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. It is fainter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  22 50.94  -16 32.1   2.222   3.223   170   16.9   0:27 (  0, 39)  
Sept. 4  22 45.98  -17 11.7   2.199   3.197   170   16.8  23:50 (  0, 38)  

* C/2019 K7 ( Smith )

Now it is 16.5 mag (July 29, 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)  
Aug. 28  16 19.13   53 24.1   5.733   5.666    81   16.8  20:00 (139, 61)  
Sept. 4  16 16.29   52 34.5   5.806   5.699    78   16.9  19:49 (135, 59)  

* C/2020 S3 ( Erasmus )

It brightened up to 3 mag in December in the SOHO spacecraft images (Dec. 18, Hirohisa Sato). Now it is 16.2 mag (July 22, ATLAS-MLO, Mauna Loa). 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)  
Aug. 28  23 52.39   19  0.2   3.229   4.091   144   16.9   1:29 (  0, 74)  
Sept. 4  23 46.12   18 23.9   3.259   4.170   150   17.0   0:55 (  0, 74)  

* 241P/LINEAR

Now it is 17.3 mag (Aug. 2, F. Kugel, J.-G. Bosch). 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)  
Aug. 28   6 50.72   36 52.7   2.331   1.944    55   17.2   4:00 (247, 37)  
Sept. 4   7  9.23   36 11.3   2.292   1.956    58   17.2   4:07 (249, 40)  

* C/2020 U5 ( PanSTARRS )

It will brighten up to 16 mag in 2022. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it is not observable until 2023.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28   8  8.56   49 19.3   4.916   4.317    48   17.3   4:00 (228, 28)  
Sept. 4   8 16.74   50 22.9   4.807   4.288    53   17.2   4:07 (228, 32)  

* 28P/Neujmin 1

Now it is 17.1 mag (Aug. 18, Toshiyuki Takahashi). 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)  
Aug. 28   4 59.74   35 55.9   2.492   2.477    77   17.3   4:00 (257, 59)  
Sept. 4   5  7.65   36 44.7   2.460   2.532    82   17.3   4:07 (257, 64)  

* P/2021 N2 ( Fuls )

Now it is 17.5 mag (Aug. 12, Michael Jager). 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)  
Aug. 28   2 29.81   18 51.6   3.320   3.835   113   17.4   4:00 (356, 74)  
Sept. 4   2 31.19   18 46.7   3.227   3.831   119   17.4   3:39 (  0, 74)  

* C/2017 Y2 ( PanSTARRS )

Now it is 16.6 mag (July 25, ATLAS-MLO, Mauna Loa). 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)  
Aug. 28  15  9.60  -22 37.0   5.332   5.192    76   17.4  20:00 ( 47, 16)  
Sept. 4  15  8.90  -23  3.8   5.478   5.217    69   17.5  19:49 ( 49, 13)  

* 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 17.6 mag (July 29, J. Drummond). 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)  
Aug. 28  16  8.96  -45 19.1   5.410   5.572    94   17.4  20:00 ( 23,  4)  
Sept. 4  16 10.88  -45 13.4   5.575   5.633    88   17.6  19:49 ( 26,  3)  

* 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 will be observable only in extremely low sky from autumn to winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28   8 53.78  -17 21.3   6.154   5.363    35   17.5   4:00 (281,-16)  
Sept. 4   8 56.72  -18 30.0   6.113   5.358    38   17.5   4:07 (286,-10)  

* C/2020 F2 ( ATLAS )

Now it is 17.8 mag (Aug. 4, ATLAS-HKO, Haleakala). 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)  
Aug. 28  14 18.90   -5 20.3   9.476   9.013    59   17.5  20:00 ( 69, 19)  
Sept. 4  14 19.17   -5 22.1   9.570   9.004    53   17.5  19:49 ( 71, 16)  

* 395P/2020 H1 ( Catalina-NEAT )

Now it is 17.0 mag (July 26, ATLAS-HKO, Haleakala)。It stays observable at 17-18 mag for a long time from 2021 to 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  19  4.63  -18 47.3   3.388   4.117   130   17.5  20:38 (  0, 36)  
Sept. 4  19  4.38  -18 52.0   3.464   4.111   123   17.5  20:10 (  0, 36)  

* 424P/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 (July 10, ATLAS-HKO, Haleakala). 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)  
Aug. 28  19 32.19  -41 22.3   0.712   1.569   130   17.5  21:06 (  0, 14)  
Sept. 4  19 34.70  -40 55.2   0.709   1.530   124   17.6  20:41 (  0, 14)  

* 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)  
Aug. 28  13 43.90   53 39.2   2.630   2.278    58   17.7  20:00 (134, 38)  
Sept. 4  13 58.69   49 25.4   2.681   2.302    57   17.8  19:49 (129, 37)  

* 422P/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)  
Aug. 28  21 58.35  -69 13.2   2.619   3.250   120   17.7  23:31 (  0,-14)  
Sept. 4  21 48.81  -68 32.4   2.639   3.236   117   17.7  22:54 (  0,-13)  

* 378P/2019 E2 ( McNaught )

It brightened up to 18.5 mag in 2020 spring (Apr. 2, 2020, W. Hasubick). Now it is 19.3 mag (July 16, J. P. Desgrees, J. L. Virlichie, P. Traverse, H. Roy). 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)  
Aug. 28  23 41.88  -27 47.5   2.961   3.898   154   17.7   1:18 (  0, 27)  
Sept. 4  23 38.21  -28 23.3   2.975   3.919   156   17.7   0:47 (  0, 27)  

* C/2020 U4 ( PanSTARRS )

It stays 17 mag for a long time from 2021 to 2022. It is observable in excellent condition in the Northern Hemisphere, It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28   5 38.51   32  4.9   5.876   5.603    69   17.8   4:00 (260, 50)  
Sept. 4   5 36.97   32 22.3   5.737   5.588    76   17.7   4:07 (263, 57)  

* 70P/Kojima

Appearing in the morning sky. It will brighten up to 15.5 mag, and will be observable in excellent condition in winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28   7 36.92   19 22.3   2.722   2.082    41   17.9   4:00 (260, 21)  
Sept. 4   7 53.33   18 52.1   2.659   2.068    44   17.7   4:07 (263, 24)  

* C/2017 U7 ( PanSTARRS )

Now it is 16.4 mag (July 31, ATLAS-HKO, Haleakala). It will be fading slowly.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  16 55.24  -10 53.8   7.768   7.988    98   17.8  20:00 ( 30, 39)  
Sept. 4  16 53.76  -10 48.5   7.917   8.015    91   17.8  19:49 ( 35, 37)  

* 152P/Helin-Lawrence

Now it is 17.7 mag (July 13, 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)  
Aug. 28  14  9.12   -6 35.2   3.603   3.184    57   17.8  20:00 ( 69, 16)  
Sept. 4  14 17.12   -7 35.2   3.672   3.175    53   17.8  19:49 ( 70, 14)  

* 230P/LINEAR

Now it is 18.6 mag (Aug. 3, ATLAS-HKO, Haleakala). It will brighten up to 16.5-17 mag in winter. In its last apparition in 2015, it brightened up to 13 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28  22 11.98  -29 50.0   1.472   2.444   159   17.9  23:44 (  0, 25)  
Sept. 4  22  5.39  -30 56.8   1.455   2.402   154   17.8  23:10 (  0, 24)  

* 88P/Howell

It brightened up to 8.2 mag in 2020 autumn (Oct. 13, 2020, Chris Wyatt). Now it is 18.9 mag (July 15, Palomar Mountain--ZTF). It is observable at 18 mag in 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Aug. 28   5  4.08   23  0.1   3.251   3.188    77   17.8   4:00 (278, 53)  
Sept. 4   5  8.57   23 10.8   3.185   3.225    83   17.9   4:07 (284, 59)  

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