Weekly Information about Bright Comets (2020 Apr. 4: North)

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 Updated on April 9, 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 )

It brightened very rapidly. Now it is very bright as 6.9 mag (Apr. 2, Charles S. Morris). It moves along the same orbit as C/1844 Y1 (Great Comet). It approaches to Sun down to 0.25 a.u. on May 31. 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 1-2 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)  
Apr.  4   7 33.31   68 17.0   1.035   1.419    88    7.1  19:50 (169, 55)  
Apr. 11   6 48.93   67  3.3   1.012   1.287    79    6.6  19:57 (158, 52)

* C/2017 T2 ( PanSTARRS )

Now it is 8.6 mag (Apr. 2, 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)  
Apr.  4   3 11.74   69 41.2   1.764   1.668    67    8.3  19:50 (155, 35)  
Apr. 11   3 41.12   71 48.9   1.753   1.647    67    8.3  19:57 (158, 35)

* C/2019 Y1 ( ATLAS )

Now it is very bright as 8.3 mag (Apr. 2, Maik Meyer). It stays bright as 8-9 mag until mid April. It stays observable for a long time in the Northern Hemisphere. 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)  
Apr.  4   0 22.08   50  5.8   1.287   0.913    44    8.6   4:16 (219, 16)  
Apr. 11   0 34.76   58 13.2   1.220   0.970    50    9.1   4:05 (213, 21)

* 58P/Jackson-Neujmin

Recovered from SWAN images after 24-year blank. Now it is very bright as 10.7 mag (Apr. 7, Michael Mattiazzo). It stays 10-11 mag until August. In the Southern Hemisphere, it stays observable in the morning sky for a long time. In the Northern Hemisphere, it is too low to observe until July. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  4  22 47.85   -4 35.0   2.254   1.515    32   11.3   4:16 (276,  1)  
Apr. 11  23 10.11   -3  0.5   2.204   1.483    33   11.0   4:05 (274,  1)

* 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 evening 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)  
Apr.  4   2  1.92   10 28.1   1.393   0.535    17   12.0  19:50 (104, -1)  
Apr. 11   2 46.28   15 47.1   1.291   0.532    22   11.8  19:57 (107,  4)

* C/2019 U6 ( Lemmon )

Now it is very bright as 11.5 mag (Mar. 30, Marco Goiato). It will approach to Sun down to 0.9 a.u. in June, and it is extected to brighten up to 7.5 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)  
Apr.  4   4 22.09  -23 29.5   1.841   1.574    58   12.2  19:50 ( 57,  5)  
Apr. 11   4 32.19  -23  6.8   1.777   1.487    56   11.8  19:57 ( 60,  1)

* C/2018 N2 ( ASASSN )

Now it is 13.2 mag (Mar. 23, Thomas Lehmann). 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)  
Apr.  4   0 30.68   54 26.2   3.996   3.424    48   12.8   4:16 (215, 17)  
Apr. 11   0 38.81   56 16.1   4.032   3.452    48   12.8   4:05 (214, 19)

* 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. In the Southern Hemisphere, it is only visible in the extremely low sky in spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  4   5 33.93   48 25.9   1.726   1.718    72   13.5  19:50 (126, 53)  
Apr. 11   5 46.19   44 32.4   1.926   1.804    67   14.0  19:57 (120, 49)

* 29P/Schwassmann-Wachmann 1

Now it is not observable. It will appear in the morning sky in June. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  4   1 26.15   17 26.0   6.760   5.796    14   13.9  19:50 (115, -5)  
Apr. 11   1 31.74   17 57.6   6.781   5.797    10   13.9  19:57 (120, -9)

* 88P/Howell

Now it is 14.6 mag (Mar. 22, Thomas Lehmann). 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)  
Apr.  4  13 25.88   -3 40.3   1.221   2.216   171   14.2   0:37 (  0, 51)  
Apr. 11  13 18.69   -3  4.9   1.169   2.169   174   13.9   0:02 (  0, 52)

* 246P/NEAT

Now it is 14.7 mag (Mar. 15, Sandor Szabo). It stays 13-14 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)  
Apr.  4  12 54.87   17 23.3   2.377   3.321   156   14.3   0:06 (  0, 72)  
Apr. 11  12 49.84   17 36.9   2.379   3.304   153   14.2  23:29 (  0, 73)

* C/2019 N1 ( ATLAS )

Now it is 14.4 mag (Mar. 15, 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)  
Apr.  4  18 21.89   74 53.0   3.299   3.389    86   14.4   4:16 (187, 49)  
Apr. 11  18  0.89   76 47.5   3.235   3.324    86   14.3   4:05 (183, 48)

* C/2018 F4 ( PanSTARRS )

Now it is bright as 14.1 mag (Mar. 20, Chris Wyatt). It stays 15 mag until summer. 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)  
Apr.  4   2  8.21  -47 35.4   4.086   3.620    55   14.6  19:50 ( 51,-30)  
Apr. 11   2 15.82  -45 45.6   4.112   3.640    55   14.6  19:57 ( 55,-34)

* C/2020 F3 ( NEOWISE )

Now it is 14.6 mag (Mar. 31, Katsumi Yoshimoto). It will approach to Sun down to 0.29 a.u. on July 3, and it will brighten up to 6 mag. In the Southern Hemisphere, it stays observable in good condition until early June when it brightens up to 11 mag. But it will not be observable around the perihelion passage. In the Northern Hemisphere, it locates in extremely low sky in early April, but it will be unobservable soon. It will appear in the evening sky at 7 mag in mid July, then it stays observable while getting fainter. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  4   6 43.09  -43 37.5   1.654   1.965    92   15.0  19:50 ( 22,  7)  
Apr. 11   6 30.65  -38 20.0   1.631   1.852    85   14.7  19:57 ( 32,  7)

* C/2019 F1 ( ATLAS-Africano )

Now it is 15.8 mag (Mar. 18, 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)  
Apr.  4  14 50.09  -18 34.7   4.412   5.293   148   15.5   2:01 (  0, 36)  
Apr. 11  14 45.72  -18 58.7   4.317   5.251   156   15.4   1:29 (  0, 36)

* C/2020 F5 ( MASTER )

Now it is 15.6 mag (Apr. 5, iTelescope Observatory, Siding Spring). It stays 14-15 mag until 2021. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until June in 2021. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  4  17 12.01  -78 32.8   4.923   5.198   100   15.6   4:16 (  0,-24)  
Apr. 11  17 16.28  -79 37.6   4.842   5.168   103   15.6   4:01 (  0,-25)

* C/2017 K2 ( PanSTARRS )

Now it is 15.6 mag (Mar. 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 is only visible in the extremely low sky in summer in 2020. 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)  
Apr.  4  18 18.85   50  4.2   9.388   9.460    91   15.6   4:16 (216, 70)  
Apr. 11  18 17.96   50 37.1   9.304   9.410    93   15.6   4:05 (208, 71)

* 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)  
Apr.  4   1 45.67    0  1.9   2.657   1.706    14   15.6  19:50 ( 98,-11)  
Apr. 11   2  5.24    1 28.3   2.673   1.714    13   15.6  19:57 (102,-13)

* C/2019 K7 ( Smith )

Now it is 16.0 mag (Dec. 4, Kunihiro Shima). 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)  
Apr.  4  20 54.22   -2 13.4   4.929   4.515    60   16.0   4:16 (292, 25)  
Apr. 11  20 54.82   -0 52.8   4.815   4.508    66   16.0   4:05 (294, 29)

* 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)  
Apr.  4  23 45.20  -35 54.9   4.433   3.786    44   16.1   4:16 (297,-27)  
Apr. 11  23 50.14  -34 54.7   4.418   3.821    48   16.2   4:05 (297,-24)

* 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 16.4 mag (Mar. 20, 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)  
Apr.  4   5 33.94  -17 22.2   6.584   6.364    73   16.3  19:50 ( 49, 21)  
Apr. 11   5 35.95  -16 25.0   6.722   6.419    68   16.4  19:57 ( 55, 17)

* C/2018 U1 ( Lemmon )

Now it is 17.2 mag (Mar. 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)  
Apr.  4  19 15.47   31 57.6   6.669   6.609    82   16.4   4:16 (267, 63)  
Apr. 11  19 14.47   32 23.2   6.562   6.576    86   16.4   4:05 (268, 67)

* C/2019 C1 ( ATLAS )

Now it is 16.1 mag (Mar. 18, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 16-17 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)  
Apr.  4  10 42.36  -21 47.5   5.744   6.585   144   16.5  21:50 (  0, 33)  
Apr. 11  10 41.43  -21  6.5   5.784   6.583   140   16.5  21:21 (  0, 34)

* 124P/Mrkos

Now it is 16.1 mag (Mar. 18, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 16 mag in good condition until April. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  4  10  4.75   22  2.5   0.829   1.662   130   16.5  21:12 (  0, 77)  
Apr. 11  10  0.58   17 43.2   0.865   1.654   124   16.6  20:40 (  0, 72)

* C/2017 M4 ( ATLAS )

It brightened up to 12-13 mag from 2018 to 2019. Now it is fading. It has already faded down to 16.5 mag (Mar. 8, J. Drummond). 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)  
Apr.  4  10 32.97  -75 11.0   4.773   5.166   107   16.5  21:38 (  0,-20)  
Apr. 11  10  8.90  -73 58.8   4.800   5.211   108   16.6  20:47 (  0,-19)

* P/2019 Y2 ( Fuls )

Now it is 16.4 mag (Mar. 19, Thomas Lehmann). 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)  
Apr.  4  13 20.19    0 20.0   1.180   2.174   170   16.5   0:31 (  0, 55)  
Apr. 11  13 15.33    0 36.9   1.190   2.185   171   16.6  23:54 (  0, 56)

* C/2019 K1 ( ATLAS )

Now it is 16.4 mag (Feb. 28, iTelescope Observatory, Siding Spring). It started getting fainter before the perihelion passage. It seems to be fainter than 18 mag in June. In the Southern Hemisphere, it will be too low to observe soon. It is not observable in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  4   3 27.68  -35 15.8   2.517   2.105    54   16.5  19:50 ( 55,-11)  
Apr. 11   3 40.70  -31 18.7   2.593   2.131    52   16.7  19:57 ( 61,-13)

* C/2017 U7 ( PanSTARRS )

Now it is 15.8 mag (Mar. 1, iTelescope Observatory, Siding Spring). It is observable at 16.5 mag in 2020. It is observable in excellent condition 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)  
Apr.  4  20 10.20  -30  2.9   6.730   6.567    76   16.7   4:16 (320, 12)  
Apr. 11  20  8.82  -29 57.6   6.616   6.577    83   16.6   4:05 (324, 14)

* 112P/Urata-Niijima

Now it is 16.9 mag (Mar. 18, 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)  
Apr.  4   3 34.52   35 16.4   2.062   1.569    47   16.8  19:50 (115, 29)  
Apr. 11   3 59.38   36 58.1   2.118   1.599    46   17.0  19:57 (117, 28)

* 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)  
Apr.  4   0 10.93  -54 44.1   3.459   3.101    61   16.8   4:16 (316,-37)  
Apr. 11   0 23.15  -56  2.4   3.456   3.172    65   17.0   4:05 (318,-36)

* C/2019 L3 ( ATLAS )

Now it is 17.4 mag (Jan. 24, Thomas Lehmann). It will brighten up to 12 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 2021 November. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  4  23 32.26   44  9.3   7.243   6.539    42   17.0   4:16 (229, 19)  
Apr. 11  23 38.66   44 52.0   7.197   6.494    42   16.9   4:05 (229, 21)

* 87P/Bus

Now it is 16.3 mag (Mar. 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)  
Apr.  4  12 47.44   -4  1.3   1.116   2.116   177   17.0  23:54 (  0, 51)  
Apr. 11  12 43.44   -3 21.8   1.116   2.110   169   17.0  23:23 (  0, 52)

* 249P/LINEAR

Now it is 18.3 mag (Mar. 18, Catalina Sky Survey). 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)  
Apr.  4  10 40.50  -10  8.9   0.652   1.587   146   17.1  21:46 (  0, 45)  
Apr. 11  10 19.22   -7 34.4   0.607   1.497   135   17.0  20:58 (  0, 48)

* 114P/Wiseman-Skiff

It brightened up to 13.8 mag in 2019 winter (Dec. 21, Thomas Lehmann). Now it is fading. It has already faded down to 17.2 mag (Mar. 18, Toshihiko Ikemura, Hirohisa Sato). It 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)  
Apr.  4   6 16.76   11  6.4   1.649   1.775    80   17.1  19:50 ( 63, 49)  
Apr. 11   6 33.38   10 29.1   1.736   1.806    77   17.3  19:57 ( 66, 46)

* 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)  
Apr.  4  19 31.76   -3 14.6   2.408   2.454    80   17.2   4:16 (311, 39)  
Apr. 11  19 41.32   -1 50.9   2.309   2.430    84   17.1   4:05 (311, 41)

* 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)  
Apr.  4   6 12.70  -29 49.9   7.558   7.522    84   17.2  19:50 ( 33, 16)  
Apr. 11   6 15.07  -29 12.5   7.583   7.482    80   17.1  19:57 ( 40, 13)

* 115P/Maury

Now it is 17.6 mag (Mar. 22, 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)  
Apr.  4  18 33.07   -9 54.8   1.953   2.283    95   17.3   4:16 (331, 41)  
Apr. 11  18 42.58   -9  4.0   1.855   2.259   100   17.2   4:05 (333, 42)

* (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)  
Apr.  4  13 14.82   -3  6.0   3.703   4.699   173   17.2   0:26 (  0, 52)  
Apr. 11  13  9.16   -3  2.6   3.739   4.738   174   17.2  23:48 (  0, 52)

* C/2010 U3 ( Boattini )

Now it is 18.3 mag (Mar. 22, Toshihiko Ikemura, Hirohisa Sato). It will be fading slowly after this. 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)  
Apr.  4  13  3.24   56  0.5   8.254   8.772   118   17.3   0:14 (180, 69)  
Apr. 11  12 58.99   55 47.7   8.301   8.783   115   17.3  23:38 (180, 69)

* C/2017 Y2 ( PanSTARRS )

Now it is 17.5 mag (Mar. 20, Toshihiko Ikemura, Hirohisa Sato). 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)  
Apr.  4  20  2.30   21 32.0   5.156   4.936    71   17.4   4:16 (277, 49)  
Apr. 11  20  0.80   21 57.5   5.042   4.918    77   17.3   4:05 (280, 53)

* C/2020 F2 ( ATLAS )

Now it is 17.3 mag (Mar. 24, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 16-17 mag for a long time until 2024. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  4  16 24.19  -19 15.9   9.397  10.029   126   17.4   3:35 (  0, 36)  
Apr. 11  16 21.10  -19  1.8   9.282  10.011   134   17.3   3:04 (  0, 36)

* 117P/Helin-Roman-Alu 1

Now it is 17.4 mag (Mar. 18, 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)  
Apr.  4  10 12.43   22  8.3   3.747   4.476   131   17.6  21:20 (  0, 77)  
Apr. 11  10 10.38   22  4.2   3.815   4.463   124   17.6  20:50 (  0, 77)

* 78P/Gehrels 2

It brightened up to 13 mag from autumn to winter in 2018. Now it is fading. It has already faded down to 17.0 mag (Mar. 17, Toshihiko Ikemura, Hirohisa Sato). It will be fainter than 18 mag in April. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  4   8 49.06   10 46.0   2.736   3.313   117   17.8  19:57 (  0, 66)  
Apr. 11   8 50.79   10 56.9   2.857   3.345   110   18.0  19:57 ( 15, 65)

* 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)  
Apr.  4  12 40.61  -70  5.7   2.705   3.264   115   17.8  23:47 (  0,-15)  
Apr. 11  12 36.13  -70  2.5   2.797   3.383   117   18.0  23:15 (  0,-15)

* 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)  
Apr.  4  19 17.57  -14 48.0   7.691   7.679    85   17.9   4:16 (322, 31)  
Apr. 11  19 18.12  -15  7.9   7.574   7.679    92   17.8   4:05 (326, 33)

* C/2014 F3 ( Sheppard-Trujillo )

It will pass the perihelion in 2021, and it is predicted to be observable at 17-18 mag from 2020 to 2022. However, it has not been observed at all since 2015. It was not detected, fainter than 20.5 mag, in 2017 May (Werner Hasubick). 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr.  4  20 24.99  -22 46.9   6.391   6.144    71   17.9   4:16 (313, 15)  
Apr. 11  20 28.65  -22 34.8   6.271   6.130    77   17.9   4:05 (315, 17)

* C/2014 B1 ( Schwartz )

It brightened up to 15.5 mag from 2017 to 2018. Now it is fading. It has already faded down to 17.7 mag (Mar. 20, 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)  
Apr.  4  12 36.01   10 42.1   9.897  10.858   163   17.9  23:43 (  0, 66)  
Apr. 11  12 34.58   10 57.0   9.941  10.876   157   17.9  23:14 (  0, 66)

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