Weekly Information about Bright Comets (2020 Mar. 14: North)

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Updated on March 18, 2020
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Northern Hemisphere.
Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

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* C/2019 Y4 ( ATLAS )

Brightening very rapidly. Now it is very bright as 8.4 mag (Mar. 14, Maik Meyer). It moves along the same orbit as C/1844 Y1 (Great Comet). It approaches to Sun down to 0.25 a.u. on May 30. It is expected to brighten up to -1 mag. In the Northern Hemisphere, it stays observable in excellent condition until mid May when it brightens up to 2 mag. In the Southern Hemisphere, it is not observable until June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  10  2.13   65 12.2   1.124   1.789   115    9.1  22:29 (180, 60)  
Mar. 21   9 15.84   67 29.4   1.087   1.670   106    8.0  21:16 (180, 57)  

* C/2019 Y1 ( ATLAS )

Now it is very bright as 7.8 mag (Mar. 14, Maik Meyer). It stays bright as 8-9 mag until mid April. In the Northern Hemisphere, it stays observable for a long time, although it becomes extremely low in March. In the Southern Hemisphere, it is not observable until June when it fades down to 15 mag. It seems to be a fragment of C/1988 A1 (Liller), like C/1996 Q1 (Tabur) and C/2015 F3 (SWAN).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   0  4.01   29  6.1   1.488   0.838    32    8.5  19:30 (122,  6)  
Mar. 21   0  8.40   35 39.7   1.426   0.844    35    8.4  19:36 (131,  6)  

* C/2017 T2 ( PanSTARRS )

Now it is 8.8 mag (Mar. 14, Maik Meyer). It stays bright as 8-9 mag until July. It is observable in good condition in the Northern Hemisphere. In the Southern Hemisphere, it is not observable until July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   2 22.22   63 58.9   1.767   1.759    73    8.6  19:30 (148, 40)  
Mar. 21   2 34.03   65 42.4   1.772   1.725    70    8.5  19:36 (150, 38)  

* C/2020 A2 ( Iwamoto )

It brightened up to 10.2 mag in February (Feb. 6, Maik Meyer). Now it is fading rapidly. It has already faded down to 13.4 mag (Mar. 15, Sandor Szabo). It is observable in good condition in the Northern Hemisphere. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   4 15.24   67  4.5   1.177   1.468    84   12.0  19:30 (156, 51)  
Mar. 21   4 55.52   59 26.4   1.345   1.550    81   12.5  19:36 (146, 55)  

* C/2018 N2 ( ASASSN )

Now it is 13.3 mag (Feb. 28, Sandor Szabo). It stays bright as 12-13 mag until summer. But it becomes low in spring. 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. 14   0  8.67   49 28.5   3.858   3.347    52   12.6  19:30 (138, 19)  
Mar. 21   0 15.60   51  2.2   3.910   3.372    50   12.7  19:36 (142, 16)  

* A/2019 U6

Now it is very bright as 13.0 mag (Mar. 14, Michael Mattiazzo). It is a comet evidently. It will approach to Sun down to 0.9 a.u. in June, and it is extected to brighten up to 8.5 mag. In the Southern Hemisphere, it stays observable in good condition for a long time after this. In the Northern Hemisphere, it will be unobservable from late March to late June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   4  1.60  -24 54.7   1.975   1.840    67   13.9  19:30 ( 42, 17)  
Mar. 21   4  6.85  -24 24.0   1.940   1.751    64   13.6  19:36 ( 47, 13)  

* 210P/Christensen

It has not been observed yet in this apparition. The condition of this apparition is bad, and it it not observable before the perihelion passage. It will appear in the morning sky at 12 mag in mid April in the Northern Hemisphere, or at 15 mag in mid May in the Southern Hemisphere. However, it will fade out rapidly, and will be fainter than 18 mag in June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   0 11.54   -3 31.8   1.705   0.739     8   14.9  19:30 ( 94,-11)  
Mar. 21   0 44.68    0 37.7   1.602   0.649    10   13.7  19:36 ( 98, -9)  

* 29P/Schwassmann-Wachmann 1

It brightened in outburst on Feb. 3. It is bright as 13.0 mag still now (Feb. 18, Toshihiko Ikemura, Hirohisa Sato). It is already unobservable in the Southern Hemisphere. It will be unobservable in mid March also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   1  9.85   15 56.0   6.637   5.793    29   13.8  19:30 (102, 11)  
Mar. 21   1 15.18   16 25.0   6.688   5.794    24   13.8  19:36 (106,  6)  

* C/2018 F4 ( PanSTARRS )

Now it is bright as 13.8 mag (Dec. 28, Chris Wyatt). It stays 14 mag until spring. It stays observable for a long time in the Southern Hemisphere. It is not observable until August in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   1 43.57  -53 55.9   3.997   3.564    57   14.4  19:30 ( 39,-22)  
Mar. 21   1 52.10  -51 40.7   4.028   3.582    56   14.4  19:36 ( 43,-24)  

* 246P/NEAT

Now it is 14.7 mag (Mar. 15, Sandor Szabo). It will brighten up to 13.5-14 mag from 2020 to 2021. It stays observable in good condition for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  13  8.73   15 58.3   2.451   3.371   153   14.5   1:42 (  0, 71)  
Mar. 21  13  4.56   16 32.4   2.413   3.354   157   14.4   1:11 (  0, 71)  

* C/2019 K1 ( ATLAS )

Now it is 15.9 mag (Dec. 26, M. Mattiazzo). In the Southern Hemisphere, it is observable at 14.5 mag from winter to spring. In the Northern Hemisphere, it is not observable until August when it fades down to 17 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   2 39.28  -48 43.7   2.344   2.045    60   14.5  19:30 ( 38,-11)  
Mar. 21   2 57.43  -44  1.1   2.391   2.062    58   14.5  19:36 ( 43,-10)  

* C/2019 N1 ( ATLAS )

Now it is 14.4 mag (Mar. 28, Sandor Szabo). It will brighten up to 10.5 mag from 2020 December to 2021 January. In the Northern Hemisphere, it stays observable in good condition while the comet will be brightening gradually, but it is not observable at the high light. In the Southern Hemisphere, it is not observable for a long time, but it will be observable in good condition after the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  18 43.79   69 15.0   3.505   3.585    86   14.8   4:48 (199, 50)  
Mar. 21  18 41.07   71  2.4   3.435   3.519    86   14.6   4:37 (196, 50)  

* 88P/Howell

Now it is 15.8 mag (Feb. 23, Toshihiko Ikemura, Hirohisa Sato). Brightening very rapidly. It will brighten up to 8-9 mag from summer to autumn. It will be observable in excellent condition in the Southern Hemisphere. It locates very low around the high light in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  13 40.60   -5  6.2   1.451   2.354   148   15.2   2:14 (  0, 50)  
Mar. 21  13 37.06   -4 42.8   1.363   2.308   155   14.9   1:43 (  0, 50)  

* 390P/2019 U1 ( Gibbs )

First return of a new periodic comet discovered in 2006. It brightened up to 14.9 mag in January (Jan. 21, R. Fichtl). It will never be observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   0 47.14   -4 28.1   2.622   1.702    17   15.6  19:30 ( 88, -5)  
Mar. 21   1  6.59   -2 57.5   2.632   1.700    16   15.6  19:36 ( 91, -7)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 16.1 mag (Feb. 20, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 13 mag in 2021. In 2020, it is observable at 15 mag in good condition from spring to summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  14 59.44  -17 15.9   4.773   5.419   126   15.7   3:33 (  0, 38)  
Mar. 21  14 57.00  -17 43.3   4.641   5.377   133   15.6   3:03 (  0, 37)  

* C/2017 K2 ( PanSTARRS )

Now it is 15.4 mag (Feb. 20, 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 unobservable 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. 14  18 18.21   48 25.8   9.644   9.609    85   15.7   4:48 (230, 64)  
Mar. 21  18 18.95   48 57.9   9.558   9.559    87   15.7   4:37 (226, 66)  

* C/2018 A6 ( Gibbs )

Now it is 14.6 mag (Dec. 28, Chris Wyatt). It will be fading slowly after this. In the Southern Hemisphere, it becomes low from February to March, but it stays observable for a long time. In the Northern Hemisphere, it is not observasble until June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  23 28.20  -39 31.0   4.429   3.684    37   15.9   4:48 (297,-34)  
Mar. 21  23 34.21  -38 13.0   4.439   3.717    38   16.0   4:37 (297,-32)  

* C/2016 M1 ( PanSTARRS )

It brightened up to 7.7 mag in June in 2018 (June 19, Juan Jose Gonzalez). Now it is fading. It has already faded down to 15.8 mag (Feb. 18, Toshihiko Ikemura, Hirohisa Sato). In the Southern Hemisphere, it stays observable for a long time until the comet will fade out. In the Northern Hemisphere, it stays low for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   5 30.48  -20 36.4   6.160   6.200    87   16.1  19:30 ( 24, 31)  
Mar. 21   5 31.15  -19 28.2   6.302   6.255    82   16.2  19:36 ( 33, 28)  

* C/2019 K7 ( Smith )

Now it is 15.8 mag (Oct. 5, Toshihiko Ikemura, Hirohisa Sato). It stays 15-16 mag for a long time until 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  20 49.46   -6  0.9   5.234   4.541    41   16.2   4:48 (288, 14)  
Mar. 21  20 51.49   -4 47.4   5.140   4.532    47   16.1   4:37 (289, 17)  

* 114P/Wiseman-Skiff

Now it is 15.5 mag (Feb. 18, Sandor Szabo). It will be fading after this, and will be fainter than 18 mag in May. In the Northern Hemisphere, it is observable in excellent condition. It locates low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   5 26.13   12 53.5   1.402   1.691    88   16.3  19:30 ( 49, 60)  
Mar. 21   5 43.09   12 17.7   1.482   1.717    85   16.5  19:36 ( 54, 56)  

* C/2017 M4 ( ATLAS )

It will be fading slowly after this. In the Southern Hemisphere, it stays observable in good condition for a long time. It will never be observable after this in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  12 11.66  -76 33.8   4.748   5.029   100   16.4   0:47 (  0,-22)  
Mar. 21  11 36.28  -76 33.1   4.747   5.075   103   16.4  23:35 (  0,-22)  

* 124P/Mrkos

Now it is 15.9 mag (Feb. 18, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 16 mag in March, and it will be observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  10 35.40   34 24.0   0.786   1.699   145   16.4  23:04 (  0, 89)  
Mar. 21  10 22.23   30 34.6   0.788   1.684   141   16.4  22:24 (  0, 85)  

* 112P/Urata-Niijima

Now it is 16.6 mag (Feb. 19, Toshihiko Ikemura, Hirohisa Sato). It stays 16.5 mag until late March. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   2 24.82   28 28.4   1.909   1.496    50   16.4  19:30 (104, 33)  
Mar. 21   2 47.13   31  0.1   1.957   1.517    49   16.5  19:36 (108, 32)  

* C/2018 W2 ( Africano )

It brightened up to 8.3 mag in September (Sept. 20, Maik Meyer). Now it is fading. It has already faded down to 14.9 mag (Dec. 28, Chris Wyatt). In the Southern Hemisphere, it stays observable for a long time after this. In the Northern Hemisphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  23 36.77  -51 33.5   3.442   2.889    49   16.4   4:48 (311,-39)  
Mar. 21  23 47.78  -52 30.0   3.454   2.960    52   16.6   4:37 (313,-38)  

* 101P/Chernykh

Now it is 15.9 mag (Feb. 18, Toshihiko Ikemura, Hirohisa Sato). It will be fading slowly after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   2 27.50   10 50.8   3.009   2.404    44   16.5  19:30 ( 86, 24)  
Mar. 21   2 40.76   12  3.6   3.078   2.418    41   16.5  19:36 ( 91, 21)  

* C/2019 C1 ( ATLAS )

Now it is 16.4 mag (Feb. 23, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17 mag from 2020 to 2021. It locates somewhat low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  10 47.07  -23 38.2   5.702   6.591   151   16.5  23:17 (  0, 31)  
Mar. 21  10 45.25  -23  4.2   5.703   6.588   150   16.5  22:47 (  0, 32)  

* P/2019 Y2 ( Fuls )

Now it is 16.8 mag (Feb. 18, Toshihiko Ikemura, Hirohisa Sato). It brightens up to 16.5 mag and will be observable in good condition from March to April.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  13 31.57   -0 45.6   1.222   2.147   151   16.6   2:05 (  0, 54)  
Mar. 21  13 28.70   -0 23.8   1.197   2.155   158   16.5   1:35 (  0, 54)  

* C/2018 U1 ( Lemmon )

Now it is 17.2 mag (Feb. 20, Toshihiko Ikemura, Hirohisa Sato). It will stay at 14 mag for a long time from 2021 to 2022. In the Northern Hemisphere, it stays observable in good condition while brightening gradually. In the Southern Hemisphere, it is appearing in the morning sky. But it stays locating low for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  19 14.98   30 46.6   6.975   6.708    70   16.6   4:48 (263, 52)  
Mar. 21  19 15.68   31  8.6   6.877   6.675    74   16.6   4:37 (265, 56)  

* A/2017 U7

It looks cometary on the LCO (CTIO) image on Aug. 21, 2019. Now it is 16.2 mag (Oct. 2, ATLAS-MLO, Mauna Loa). It is appearing in the mornign sky in the Southern Hemisphere. It will be observable in late March also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  20 11.11  -30 28.8   7.043   6.538    55   16.7   4:48 (312,  4)  
Mar. 21  20 11.29  -30 18.5   6.945   6.548    62   16.7   4:37 (315,  7)  

* 87P/Bus

Now it is 17.4 mag (Feb. 20, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 17 mag and will be observable in excellent condition from March to May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  12 58.01   -5 51.9   1.186   2.140   157   17.2   1:32 (  0, 49)  
Mar. 21  12 55.12   -5 19.4   1.151   2.131   165   17.1   1:01 (  0, 50)  

* 2I/2019 Q4 ( Borisov )

It brightened up to 14.5 mag in December (Dec. 22, Alan Hale). Now it is 17.4 mag (Mar. 13, E. Jehin, et al.). The orbit is extremely hyperbolic with e=3.35. It is the first interstellar comet in history. It will be fading after this, and will be fainter than 18 mag in April. In the Southern Hemisphere, it is observable in excellent condition. In the Northern Hemisphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  12 54.43  -68 26.3   2.460   2.921   107   17.1   1:28 (  0,-13)  
Mar. 21  12 50.38  -69 19.4   2.537   3.032   110   17.3   0:57 (  0,-14)  

* 78P/Gehrels 2

Now it is 15.9 mag (Feb. 18, Toshihiko Ikemura, Hirohisa Sato). It will be fading gradually after this. It will be fainter than 18 mag in April.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   8 49.75    9 46.8   2.410   3.218   137   17.1  21:20 (  0, 65)  
Mar. 21   8 48.49   10 10.8   2.511   3.250   130   17.4  20:51 (  0, 65)  

* C/2010 U3 ( Boattini )

Now it is 17.8 mag (Feb. 20, Toshihiko Ikemura, Hirohisa Sato). It will be fading slowly after this, and will be fainter than 18 mag in 2021. It is observable in good condition in the Northern Hemisphere. In the Southern Hemisphere, it is observable in the extremely low sky only in 2021 spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  13 15.83   56  4.8   8.160   8.740   122   17.2   1:49 (180, 69)  
Mar. 21  13 11.79   56  8.9   8.183   8.750   121   17.2   1:18 (180, 69)  

* C/2019 T4 ( ATLAS )

Now it is 17.4 mag (Feb. 23, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 13 mag in 2022. In 2020, it is observable in excellent condition in the Southern Hemisphere. In the Northern Hemisphere, it will be unobservable soon. It will be observable again from autumn to winter, but it locating extremely low.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   6  8.41  -31 47.6   7.487   7.645    95   17.3  19:30 ( 12, 22)  
Mar. 21   6  9.35  -31  8.1   7.510   7.604    91   17.2  19:36 ( 19, 21)  

* 249P/LINEAR

Now it is 20.6 mag (Feb. 4, Pan-STARRS 1, Haleakala). It will brighten rapidly, and will brighten up to 9.5 mag in June. It is not observable in June. However, it stays observable in good condition until May while the comet is brightening, and after July while the comet will be fading.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  11 35.29  -14 46.4   0.868   1.841   162   17.6   0:10 (  0, 40)  
Mar. 21  11 19.40  -13 46.0   0.782   1.759   162   17.3  23:20 (  0, 41)  

* (944) Hidalgo

Now it is 17.6 mag (Feb. 3, ATLAS-HKO, Haleakala). It brightened up to 14 mag from autumn to winter in 2018. Now it is fading. It is observable at 17.5 mag in good condition from winter to spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  13 31.16   -3 16.8   3.687   4.581   150   17.4   2:05 (  0, 52)  
Mar. 21  13 25.99   -3 13.8   3.677   4.620   158   17.3   1:32 (  0, 52)  

* 257P/Catalina

It will brighten up to 15.5 mag and will be observable in good condition from June to September.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  19  0.44   -6 54.7   2.711   2.529    68   17.6   4:48 (309, 33)  
Mar. 21  19 11.27   -5 46.9   2.610   2.503    72   17.5   4:37 (309, 35)  

* 155P/Shoemaker 3

Now it is 16.0 mag (Feb. 17, Toshihiko Ikemura, Hirohisa Sato). It will fade out rapidly after this, and it will be fainter than 18 mag in late March.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  11 12.64   16 50.9   1.234   2.208   164   17.5  23:42 (  0, 72)  
Mar. 21  11  9.25   17  1.7   1.293   2.250   158   17.9  23:11 (  0, 72)  

* C/2017 Y2 ( PanSTARRS )

It will be observable at 16.5-17 mag from spring in 2020 to summer in 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  20  2.86   20 25.2   5.465   4.996    57   17.6   4:48 (270, 38)  
Mar. 21  20  3.26   20 45.2   5.369   4.975    61   17.5   4:37 (273, 42)  

* 117P/Helin-Roman-Alu 1

Now it is 17.8 mag (Feb. 17, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 13 mag in 2022. In 2020, it is observable at 17.5 mag in good condition in spring. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  10 22.39   21 50.0   3.602   4.514   153   17.6  22:52 (  0, 77)  
Mar. 21  10 18.53   22  1.3   3.638   4.502   146   17.6  22:21 (  0, 77)  

* C/2019 T3 ( ATLAS )

Now it is 17.8 mag (Feb. 23, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 16.5 mag for a long time from 2020 to 2021. In the Northern Hemisphere, it is observable in excellent condition for a long time. In the Southern Hemisphere, it is not observable until 2021 summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   1 12.02   68 32.4   6.662   6.441    72   17.7  19:30 (154, 33)  
Mar. 21   1 16.57   68  0.7   6.712   6.423    68   17.7  19:36 (154, 31)  

* 115P/Maury

Now it is 18.6 mag (Feb. 23, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15.5 mag from June to August, and it will be observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  18  1.14  -12  0.7   2.259   2.362    83   17.9   4:48 (327, 37)  
Mar. 21  18 12.28  -11 23.7   2.155   2.335    87   17.7   4:37 (328, 38)  

* C/2014 B1 ( Schwartz )

Now it is 17.6 mag (Feb. 18, Toshihiko Ikemura, Hirohisa Sato). It will be fainter than 18 mag in late April.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  12 40.34    9 49.3   9.852  10.804   162   17.8   1:14 (  0, 65)  
Mar. 21  12 38.94   10  7.9   9.852  10.822   166   17.8   0:45 (  0, 65)  

* 173P/Mueller 5

Now it is 17.5 mag (Feb. 18, Toshihiko Ikemura, Hirohisa Sato). It is observable at 17-18 mag for a long time from late 2019 to early 2021. It will fade out before it passes the perihelion.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   3 13.36    7 13.6   5.450   4.947    54   17.8  19:30 ( 76, 31)  
Mar. 21   3 18.18    7 51.1   5.523   4.934    49   17.8  19:36 ( 81, 26)  

* C/2019 F2 ( ATLAS )

Fading. Now it is 18.0 mag (Feb. 26, Hidetaka Sato). It will be fainter than 18 mag soon.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  17 53.92   -4 31.1   2.866   2.958    85   17.8   4:48 (324, 44)  
Mar. 21  17 59.51   -3 45.0   2.822   3.003    90   17.9   4:37 (328, 46)  

* C/2015 O1 ( PanSTARRS )

Fading. Now it is 18.3 mag (Feb. 18, Toshihiko Ikemura, Hirohisa Sato). It stays observable in good condition for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   7 46.61   23  5.3   6.676   7.235   120   17.8  20:17 (  0, 78)  
Mar. 21   7 43.51   22 52.5   6.829   7.279   113   17.9  19:46 (  0, 78)  

* 175P/Hergenrother

It is observable at 17.5 mag in good condition in spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  17 52.87  -17 47.8   2.193   2.332    85   17.9   4:48 (332, 32)  
Mar. 21  18  0.87  -17 42.4   2.134   2.361    90   17.9   4:37 (335, 33)  

* C/2017 K5 ( PanSTARRS )

Now it is 17.8 mag (Oct. 9, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 18 mag for a long time from 2019 to 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14  19 13.54  -13 55.8   8.032   7.679    65   18.0   4:48 (311, 25)  
Mar. 21  19 15.26  -14 12.2   7.922   7.679    72   17.9   4:37 (314, 27)  

* 321P/SOHO

It passed the perihelion on Jan . 17. Now it is fading very rapidly. But it is observable in excellent condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 14   6 44.81    8 16.0   0.825   1.468   107   21.2  19:30 (  8, 63)  
Mar. 21   6 58.98   10 12.9   1.009   1.580   103   22.0  19:36 ( 19, 64)  

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