Weekly Information about Bright Comets (2021 Mar. 20: North)

Japanese version
Home page
Updated on March 22, 2021
Last week South Next week

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.

---------------------------------------------------------------------

* C/2020 R4 ( ATLAS )

It brightened rapidly in December. Now it is bright as 9.6 mag (Mar. 17, Carlos Labordena). It will approach to Earth down to 0.46 a.u. in April, and it will be observable at 9 mag in excellent condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  20 17.58   -6 59.3   1.261   1.072    55   10.3   4:39 (296, 22)  
Mar. 27  20  3.46   -4  8.2   1.062   1.111    65   10.1   4:29 (300, 29)  

* C/2021 D1 ( SWAN )

Now it is very bright as 11.0 mag (Mar. 2, Piotr Guzik). In the Northern Hemisphere, it stays observable in the evening low sky until early June while the comet will be fading. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   1  7.43   25 39.4   1.671   0.964    30   11.5  19:35 (114, 11)  
Mar. 27   1 46.36   28 58.6   1.693   1.016    33   11.7  19:42 (116, 14)  

* 10P/Tempel 2

Now it is 14.4 mag (Mar. 8, Slooh.com Chile Observatory, La Dehesa). Appearing in the morning sky in the Southern Hemisphere. In the Northern Hemisphere, it will appear in the morning sky in June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  22 11.04  -12 59.3   2.195   1.413    29   11.6   4:39 (283, -4)  
Mar. 27  22 34.20  -11 30.9   2.179   1.413    30   11.6   4:29 (281, -4)  

* C/2020 T2 ( Palomar )

It brightened rapidly. Now it is very bright as 12.8 mag (Mar. 8, Michael Jager). It stays observable at 11 mag in good condition for a long time from spring to summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  14  7.30   33 21.8   1.641   2.448   135   12.3   2:18 (  0, 88)  
Mar. 27  14  5.76   33 57.7   1.584   2.406   136   12.1   1:49 (  0, 89)  

* C/2019 N1 ( ATLAS )

Now it is bright as 12.9 mag (Feb. 9, Chris Wyatt). It stays 12 mag until March. 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)  
Mar. 20   3 21.40  -75 51.2   2.127   2.201    80   12.6  19:35 ( 14,-27)  
Mar. 27   3 34.65  -71 52.1   2.197   2.256    80   12.7  19:42 ( 19,-26)  

* C/2019 L3 ( ATLAS )

Now it is 12.8 mag (Mar. 9, W. Pei). 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)  
Mar. 20   1 58.67   51 23.2   4.882   4.430    57   13.0  19:35 (134, 31)  
Mar. 27   2 11.03   51 13.6   4.910   4.394    53   13.0  19:42 (135, 28)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 14.9 mag (Feb. 11, iTelescope Observatory, Siding Spring). It will brighten up to 13 mag from spring to summer. 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)  
Mar. 20  18 41.29  -63 36.2   3.650   3.697    84   13.5   4:39 (346,-12)  
Mar. 27  18 56.45  -65 18.6   3.567   3.683    88   13.4   4:29 (347,-13)  

* C/2017 K2 ( PanSTARRS )

Now it is 13.3 mag (Mar. 17, 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)  
Mar. 20  18 27.39   38 20.6   6.850   6.824    84   13.5   4:39 (253, 66)  
Mar. 27  18 28.03   38 57.3   6.738   6.768    87   13.4   4:29 (251, 69)  

* 29P/Schwassmann-Wachmann 1

Now it is 13.2 mag (Mar. 6, Thomas Lehmann). It is already unobservable in the Southern Hemisphere. It will be unobservable in April also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   2 45.66   24 42.0   6.489   5.866    47   13.8  19:35 (101, 29)  
Mar. 27   2 50.81   24 56.7   6.570   5.867    42   13.9  19:42 (105, 24)  

* 246P/NEAT

Now it is 14.7 mag (Feb. 17, iTelescope Observatory, Siding Spring). 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)  
Mar. 20  18 46.64  -23 34.9   2.892   2.867    78   14.0   4:39 (326, 23)  
Mar. 27  18 54.94  -23 53.4   2.802   2.869    83   13.9   4:29 (328, 24)  

* C/2021 A2 ( NEOWISE )

It brightened up to 10.5 mag in early February (Feb. 6, Marco Goiato). Now it is fading rapidly. It has already faded down to 14.6 mag (Mar. 6, Michael Jager). In the Northern Hemisphere, it stays observable for a long time after this. In the Southern Heimsphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   5  0.55   45 32.6   1.465   1.626    80   14.1  19:35 (122, 60)  
Mar. 27   4 58.87   47 39.7   1.648   1.677    74   14.6  19:42 (125, 54)  

* C/2020 J1 ( SONEAR )

Now it is 14.3 mag (Mar. 9, iTelescope Observatory, Siding Spring). It will brighten up to 13.5 mag in spring. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it will be getting higher and becoming observable slowly.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  17 32.88  -39 22.9   3.138   3.367    94   14.3   4:39 (347, 14)  
Mar. 27  17 24.09  -39  1.2   2.994   3.362   102   14.1   4:29 (352, 15)  

* 156P/Russell-LINEAR

Brightened rapidly, and it brightened up to 9.7 mag in November (Nov. 15, Chris Wyatt). Now it is fading. It has already faded down to 13.1 mag (Mar. 6, Thomas Lehmann). In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it locates extremely low after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   5  6.72   40 53.8   1.779   1.892    80   14.3  19:35 (113, 62)  
Mar. 27   5 27.32   40 45.2   1.888   1.941    77   14.6  19:42 (112, 60)  

* C/2020 S3 ( Erasmus )

It brightened up to 5.6 mag in early December (Dec. 9, Marco Goiato). In mid December, it was visible at about 3 mag in the SOHO spacecraft images (Dec. 18, Hirohisa Sato). Now it is not observable. It will appear in the morning sky again in April. But then it will be fainter than 15 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  22 55.65    6  3.4   2.935   2.002    16   14.4   4:39 (261, -2)  
Mar. 27  23  6.61    7 20.9   3.021   2.108    19   14.6   4:29 (261,  0)  

* C/2019 T4 ( ATLAS )

Now it is 14.6 mag (Mar. 2, ATLAS-MLO, Mauna Loa). 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 observable in the low sky until May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   7 58.91  -35 28.6   5.096   5.578   114   14.5  20:06 (  0, 20)  
Mar. 27   7 59.19  -34 26.1   5.104   5.542   111   14.4  19:42 (  1, 21)  

* 7P/Pons-Winnecke

Now it is 14.6 mag (Mar. 15, Thomas Lehmann). Brightenening very rapidly. It will brighten up to 11 mag from May to August. In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it stays observable in good condition for a while. But it becomes extremely low after July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  17 15.18    9 34.7   0.931   1.482   100   14.9   4:39 (335, 63)  
Mar. 27  17 35.82    9 20.4   0.861   1.439   101   14.5   4:29 (333, 62)  

* 88P/Howell

It brightened up to 8.2 mag in autumn (Oct. 13, Chris Wyatt). Now it is fading. It has already faded down to 13.0 mag (Feb. 14, Sandor Szabo). It is not observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   1 10.14    5 46.5   3.124   2.207    19   14.6  19:35 ( 97,  0)  
Mar. 27   1 23.42    7 13.1   3.198   2.254    15   14.8  19:42 (101, -3)  

* C/2021 A4 ( NEOWISE )

It brightening very rapidly up to 12.5 mag in early February (Feb. 8, Michael Jager). Now it is fading. But it is still bright as 12.3 mag (Mar. 2, Michael Jager). In the Northern Hemisphere, it stays observable in excellent condition. It will be observable in good condition after this also in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   4 14.57   -1 58.1   1.145   1.146    64   14.6  19:35 ( 61, 32)  
Mar. 27   4 12.86   -5 19.8   1.311   1.151    57   14.9  19:42 ( 65, 23)  

* C/2020 K5 ( PanSTARRS )

It will brighten up to 13 mag from spring to summer. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until September when it fades down to 15 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  20 35.17  -34 43.8   2.184   1.865    58   14.9   4:39 (314,  0)  
Mar. 27  20 58.50  -36 47.7   2.063   1.814    61   14.7   4:29 (314, -3)  

* C/2018 U1 ( Lemmon )

Now it is 15.9 mag (Mar. 7, Thomas Lehmann). It will stay at 14 mag for a long time from 2021 to 2022. It stays observable in good condition after this while brightening gradually. Although it was observed at 15 mag in 2020 autumn, it is fainter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  18 23.47    2  5.1   5.309   5.290    83   14.8   4:39 (315, 48)  
Mar. 27  18 22.72    1 55.6   5.178   5.273    89   14.7   4:29 (320, 50)  

* C/2020 F5 ( MASTER )

Now it is 15.8 mag (Jan. 14, Slooh.com Chile Observatory, La Dehesa). It stays 14-15 mag until the end of 2021. In the Southern Hemisphere, it stays observable in good condition for a long time, although it becomes extremely low temporarily from January to February. In the Northern Hemisphere, it is not observable until June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  22 39.95  -42 37.5   4.961   4.326    45   15.1   4:39 (306,-25)  
Mar. 27  22 48.02  -41 37.9   4.913   4.326    49   15.1   4:29 (306,-23)  

* C/2020 M3 ( ATLAS )

It brightened up to 7.3 mag in November (Nov. 7, Marco Goiato). Now it is fading. It has already faded down to 16.0 mag (Mar. 17, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it stays observable in excellent condition for a long time. In the Southern Hemisphere, it stays locating extremely low after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   6 46.12   45 58.9   2.008   2.372    98   15.1  19:35 (148, 77)  
Mar. 27   6 58.31   45 18.7   2.156   2.444    94   15.5  19:42 (136, 74)  

* 17P/Holmes

Now it is 15.8 mag (Jan. 16, Slooh.com Canary Islands Observatory). It is not observable until June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  23 48.87    6 51.5   3.075   2.091     7   15.2   4:39 (253,-12)  
Mar. 27   0  2.97    8 55.5   3.081   2.098     8   15.2   4:29 (251,-10)  

* C/2019 T2 ( Lemmon )

Now it is 16.3 mag (Nov. 9, Toshihiko Ikemura, Hirohisa Sato). 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, although it becomes extremely low temporarily from January to February. In the Northern Hemisphere, it is not observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  23  6.20  -43 51.5   3.278   2.669    45   15.3   4:39 (305,-29)  
Mar. 27  23 18.62  -45 18.4   3.192   2.661    49   15.2   4:29 (307,-29)  

* 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 16.1 mag (Feb. 25, 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)  
Mar. 20  17 46.69  -36 55.0   3.965   4.121    91   15.2   4:39 (344, 16)  
Mar. 27  17 46.96  -37 56.4   3.919   4.186    98   15.3   4:29 (347, 16)  

* C/2021 A7 ( NEOWISE )

Now it is 15.2 mag (Mar. 17, Giuseppe Pappa). It stays 15 mag until summer. In the Southern Hemisphere, it stays observable in good condition until June. In the Northern Hemisphere, it is observable in the low sky from March to May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   6 10.43  -40 30.6   2.169   2.422    92   15.5  19:35 ( 15, 13)  
Mar. 27   6 17.97  -36 19.7   2.148   2.376    90   15.4  19:42 ( 21, 15)  

* 4P/Faye

It has not been observed yet in this apparition. It will brighten up to 10 mag from summer to autumn, and it will be observable in excellent condition. It will be appearing in the morning sky soon.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  22  8.07   -6 28.3   3.153   2.321    27   15.7   4:39 (278,  1)  
Mar. 27  22 21.80   -5 16.0   3.072   2.279    31   15.4   4:29 (278,  2)  

* 117P/Helin-Roman-Alu 1

Now it is 15.9 mag (Mar. 18, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 13 mag in 2022. In 2021, it is observable at 15-16 mag in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  13 37.48   -1 48.6   2.809   3.735   154   15.5   1:48 (  0, 53)  
Mar. 27  13 33.68   -1 28.3   2.756   3.719   162   15.5   1:17 (  0, 53)  

* C/2019 K7 ( Smith )

Now it is 15.4 mag (Mar. 16, Toshihiko Ikemura, Hirohisa Sato). It stays 15-16 mag until spring. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it will be observable in the extremely low sky only in next spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  19 22.18   36 51.4   5.190   4.997    73   15.6   4:39 (254, 55)  
Mar. 27  19 22.11   38 42.6   5.152   5.022    76   15.6   4:29 (252, 59)  

* 409P/2020 V1 ( LONEOS-Hill )

First return of a new periodic comet which brightened up to 14-15 mag in 2006. Now it is 15.3 mag (Mar. 18, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15-16 mag from February to March, and will be observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  13 21.07   17 34.0   0.895   1.839   153   15.7   1:32 (  0, 72)  
Mar. 27  13 20.91   19 10.1   0.914   1.863   154   15.9   1:04 (  0, 74)  

* 28P/Neujmin 1

Now it is not observable. It will be observable in June. But it will fade down to 17 mag at that time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  23 14.00   -6  8.8   2.540   1.581    12   15.8   4:39 (269,-13)  
Mar. 27  23 32.79   -3 23.0   2.539   1.589    13   15.8   4:29 (266,-11)  

* C/2020 N1 ( PanSTARRS )

Now it is 16.0 mag (Mar. 10, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this. In the Northern Hemisphere, it will be getting lower gradually, and will be too low to observe in May. It will be getting higher gradually in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   4 27.41   14 46.4   1.317   1.326    68   15.8  19:35 ( 75, 45)  
Mar. 27   4 53.27   12 43.3   1.351   1.339    67   16.0  19:42 ( 74, 42)  

* 398P/2020 P2 ( Boattini )

First return of a new periodic comet which brightened up to 13 mag in 2009. It brightened up to 11.7 mag in January (Jan. 10, Marco Goiato). Now it is fading. It has already faded down to 16.7 mag (Mar. 17, Toshihiko Ikemura, Hirohisa Sato). It stays observable in good condition while the comet will be fading after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   7 41.15   28  4.0   0.924   1.600   112   15.9  19:50 (  0, 83)  
Mar. 27   7 58.60   28  2.3   1.012   1.643   109   16.3  19:42 (  3, 83)  

* C/2020 M5 ( ATLAS )

Now it is 16.3 mag (Mar. 18, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it stays observable at 15 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)  
Mar. 20  20 19.22   58  7.2   3.523   3.359    72   16.1   4:39 (220, 46)  
Mar. 27  20 19.44   60 38.8   3.464   3.329    73   16.0   4:29 (216, 48)  

* C/2018 N2 ( ASASSN )

Now it is 15.4 mag (Mar. 17, 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)  
Mar. 20  16  9.87   68 12.8   5.232   5.492    99   16.1   4:19 (180, 57)  
Mar. 27  15 58.42   68 50.9   5.280   5.540    99   16.1   3:41 (180, 56)  

* C/2020 Y2 ( ATLAS )

Now it is 16.3 mag (Mar. 16, 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 when it brightens up to 16 mag. But it will not be observable at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  13 41.24  -20  9.5   4.349   5.216   147   16.4   1:52 (  0, 35)  
Mar. 27  13 33.85  -20 26.6   4.247   5.169   155   16.3   1:18 (  0, 34)  

* P/2020 U2 ( PanSTARRS )

Brightened very rapidly up to 15.0 mag (Feb. 4, Michael Jager). Now it is fading. It hasl already faded down to 16.9 mag (Mar. 14, Toshihiko Ikemura, Hirohisa Sato). It is observable in good condition in the Northern Hemisphere. It locates low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   5  0.89   28 15.3   1.955   1.996    77   16.5  19:35 ( 88, 59)  
Mar. 27   5 17.44   28 13.0   2.044   2.019    74   16.7  19:42 ( 90, 55)  

* C/2019 T3 ( ATLAS )

Now it is 16.5 mag (Feb. 9, Toshihiko Ikemura, Hirohisa Sato). It is observable at 16 mag from 2020 to 2021. In the Southern Hemisphere, it is not observable until summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  22 58.90   42 36.8   6.612   5.948    44   16.5   4:39 (230, 18)  
Mar. 27  23  2.58   42 33.3   6.627   5.949    43   16.5   4:29 (231, 20)  

* C/2020 H6 ( ATLAS )

Now it is 15.5 mag (Mar. 14, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 16 mag from 2021 to 2022.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  14 23.37  -20 57.6   4.159   4.949   138   16.5   2:34 (  0, 34)  
Mar. 27  14 20.10  -19 43.6   4.069   4.932   146   16.5   2:03 (  0, 35)  

* 141P/Machholz 2

It brightened very rapidly in early December, and it brightened up to 10.0 mag in January (Jan. 7, Michael Jager). Now it is fading. However, it brightened in outburst in early March up to 12.9 mag (Mar. 3, Martin Masek). Now it is 14.1 mag (Mar. 15, Thomas Lehmann).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   6 15.28    5  3.3   1.161   1.587    94   16.5  19:35 ( 33, 56)  
Mar. 27   6 34.70    5 33.0   1.281   1.660    92   17.2  19:42 ( 39, 55)  

* C/2017 Y2 ( PanSTARRS )

Now it is 16.7 mag (Mar. 14, Toshihiko Ikemura, Hirohisa Sato). 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)  
Mar. 20  17 47.05  -12 29.7   4.608   4.756    92   16.6   4:39 (335, 39)  
Mar. 27  17 43.70  -12 55.3   4.492   4.769   100   16.6   4:29 (341, 40)  

* C/2019 O3 ( Palomar )

Now it is 16.2 mag (Mar. 16, Toshihiko Ikemura, Hirohisa Sato). 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 is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  19 45.21   37 39.3   9.125   8.820    69   16.7   4:39 (251, 51)  
Mar. 27  19 46.35   38 38.4   9.073   8.820    72   16.7   4:29 (251, 54)  

* C/2020 S8 ( Lemmon )

Now it is 16.2 mag (Mar. 16, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 16 mag from April to May, and it will be observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  16 11.54   16 19.2   1.772   2.376   115   16.9   4:22 (  0, 71)  
Mar. 27  15 53.74   16 13.4   1.655   2.370   124   16.7   3:37 (  0, 71)  

* C/2020 O2 ( Amaral )

Now it is 17.0 mag (Mar. 4, D. Husar). It will brighten up to 16.5 mag in summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  17 36.75  -33 26.4   4.852   5.023    94   16.9   4:39 (345, 20)  
Mar. 27  17 37.41  -32 49.8   4.725   5.010   100   16.9   4:29 (348, 21)  

* C/2017 U7 ( PanSTARRS )

Now it is 17.7 mag (Mar. 6, ATLAS-MLO, Mauna Loa). It will be fading slowly.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  18 27.57  -17 44.7   7.475   7.415    82   17.0   4:39 (327, 30)  
Mar. 27  18 26.24  -17 23.5   7.372   7.438    89   17.0   4:29 (331, 32)  

* A/2019 U5

Now it is 17.5 mag (Feb. 23, Thomas Lehmann). Although it is an asteroid, it is brightening rapidly. It may 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)  
Mar. 20  18 36.12   42 31.2   7.199   7.148    83   17.1   4:39 (243, 64)  
Mar. 27  18 35.00   43 25.4   7.100   7.103    86   17.0   4:29 (240, 67)  

* 277P/LINEAR

It brightened rapidly and became brighter than expected. Now it is 16.9 mag (Mar. 18, Toshihiko Ikemura, Hirohisa Sato). It is observable in good 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)  
Mar. 20   4 56.32   20 27.6   2.029   2.029    75   17.1  19:35 ( 76, 54)  
Mar. 27   5 11.31   20  5.5   2.119   2.050    72   17.2  19:42 ( 79, 50)  

* 413P/2020 W4 ( Larson )

First return of a new periodic comet which brightened up to 16 mag in 2014. Now it is 17.0 mag (Mar. 17, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 17 mag in spring, and it will be observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  12 46.84   13  1.8   1.360   2.329   162   17.2   0:58 (  0, 68)  
Mar. 27  12 40.56   12 56.4   1.334   2.309   163   17.1   0:24 (  0, 68)  

* C/2020 R7 ( ATLAS )

Now it is 18.2 mag (Mar. 11, A. C. Gilmore, P. M. Kilmartin). It is expected to brighten up to 12 mag in 2022. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until 2022 autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   2 45.92  -43 23.2   6.307   5.827    57   17.2  19:35 ( 44,-11)  
Mar. 27   2 48.26  -42 55.9   6.277   5.778    55   17.1  19:42 ( 48,-16)  

* C/2019 C1 ( ATLAS )

Now it is 17.8 mag (Mar. 16, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. In 2021, it stays observable at 17-18 mag in good condition until early summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  13  9.63  -18 37.7   6.004   6.913   154   17.5   1:21 (  0, 36)  
Mar. 27  13  7.78  -18  8.4   5.977   6.927   160   17.5   0:51 (  0, 37)  

* C/2020 Y3 ( ATLAS )

Now it is 16.8 mag (Mar. 14, Toshihiko Ikemura, Hirohisa Sato). It stays 17.5 mag and observable in good condition until March.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  14 53.70   30 10.8   1.615   2.367   128   17.5   3:04 (  0, 85)  
Mar. 27  14 47.73   35 17.6   1.653   2.411   129   17.6   2:31 (180, 90)  

* C/2020 V2 ( ZTF )

Now it is 16.8 mag (Mar. 14, Toshihiko Ikemura, Hirohisa Sato). 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)  
Mar. 20  12 55.25   35 58.6   6.900   7.708   141   17.6   1:06 (180, 89)  
Mar. 27  12 50.25   36 41.3   6.861   7.656   140   17.5   0:34 (180, 88)  

* 99P/Kowal 1

Now it is 17.4 mag (Mar. 14, Toshihiko Ikemura, Hirohisa Sato). It stays 17-18 mag for a long time from 2021 to 2023.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  10 47.07   11 51.1   3.982   4.925   159   17.5  22:54 (  0, 67)  
Mar. 27  10 44.08   12  3.5   4.018   4.918   151   17.6  22:24 (  0, 67)  

* C/2021 A1 ( Leonard )

Now it is 17.4 mag (Mar. 18, Toshihiko Ikemura, Hirohisa Sato). 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.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  13 16.98   58 28.6   3.701   4.283   119   17.7   1:28 (180, 67)  
Mar. 27  13  1.58   59 47.6   3.655   4.206   117   17.6   0:46 (180, 65)  

* 162P/Siding Spring

Now it is 16.9 mag (Mar. 10, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this, and will be fainter than 18 mag in April. In the Northern Hemisphere, it stays observable in good condition for a long time after this. In the Southern Hemisphere, it will never be unobservable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   3 32.78   42 45.3   1.884   1.711    64   17.6  19:35 (118, 45)  
Mar. 27   3 57.56   43 55.7   1.972   1.757    62   17.7  19:42 (120, 44)  

* A/2020 F7

Now it is 17.1 mag (Mar. 18, Toshihiko Ikemura, Hirohisa Sato). Although it is an asteroid, it is brightening rapidly. It stays 17-18 mag for a long time from 2021 to 2022. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is observable only until May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   8 31.55   -6 55.7   4.947   5.617   128   17.7  20:39 (  0, 48)  
Mar. 27   8 27.22   -6 59.8   5.020   5.601   121   17.7  20:07 (  0, 48)  

* 417P/2021 B1 ( NEOWISE )

First return of a new periodic comet observed at 19 mag in 2015. Now it is 17.8 mag (Mar. 4, Giuseppe Pappa). It will brighten up to 17 mag in early summer, and it will be observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  17 17.05  -11 11.0   1.006   1.532    99   17.9   4:39 (344, 42)  
Mar. 27  17 35.93  -11 16.4   0.954   1.517   102   17.7   4:29 (343, 42)  

* C/2020 F2 ( ATLAS )

Now it is 17.7 mag (Mar. 7, ATLAS-MLO, Mauna Loa). It stays observable at 18 mag for a long time until 2024.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  15 28.26  -11 44.3   8.624   9.249   126   17.8   3:39 (  0, 43)  
Mar. 27  15 25.04  -11 21.2   8.516   9.237   134   17.8   3:08 (  0, 44)  

* C/2019 E3 ( ATLAS )

It stays 17-18 mag for a long time until 2026. In the Southern Hemisphere, it stays sobservable in good condition for a long time. It is not observable in the Northern Hemisphere. Now it is 19.7 mag (Mar. 13, A. C. Gilmore, P. M. Kilmartin), fainter than this ephemeris.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20   9  4.32  -56 55.3  11.098  11.526   113   17.8  21:11 (  0, -2)  
Mar. 27   9  0.38  -56 38.6  11.089  11.509   112   17.8  20:40 (  0, -2)  

* 47P/Ashbrook-Jackson

Now it is 17.7 mag (Mar. 7, ATLAS-MLO, Mauna Loa). Although it is around the aphelion, it is much brighter than originally predicted.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  10 58.59   10  7.9   4.441   5.398   162   18.0  23:06 (  0, 65)  
Mar. 27  10 54.93   10 20.5   4.483   5.402   154   18.0  22:34 (  0, 65)  

* P/1999 J6 = P/2004 V9 = P/2010 H3 ( SOHO )

Marsden group's comet. Three apparitions of this comet was confirmed in 1999, 2004 and 2010. It approached to Sun down to 0.044 a.u. on Feb. 28. After the perihelion passage, it may be observed on the ground from March to April.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 20  21 23.60  -15 13.2   1.101   0.738    40   22.2   4:39 (292,  4)  
Mar. 27  21 16.87  -16 43.0   1.138   0.907    49   23.6   4:29 (296,  8)  

---------------------------------------------------------------------

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