Bright comets in the coming 3 months

The below table lists all comets that are expected to become brighter than magnitude 15 in the coming 3 months.
For detailed information about a comet, click on its designation.

Comet(s) Today Perihelion Nearest approach
designation magn delta radius date magn radius date magn delta
C/2017 T2 (PANSTARRS)9.21.72 AU1.87 AU4 May 20208.61.62 AU29 Dec 20199.81.52 AU
C/2019 Y1 (ATLAS)9.51.60 AU0.92 AU15 Mar 20208.40.83 AU3 May 202011.51.09 AU
C/2020 A2 (Iwamoto)11.50.92 AU1.26 AU8 Jan 202011.90.98 AU22 Feb 202011.70.91 AU
29P/Schwassmann-Wachmann12.86.45 AU5.79 AU11 Mar 201913.35.77 AU9 Sep 201812.64.77 AU
C/2019 Y4 (ATLAS)12.91.29 AU2.10 AU31 May 2020-26.00.25 AU23 May 2020-19.60.78 AU
C/2018 N2 (ASASSN)13.13.69 AU3.29 AU10 Nov 201911.73.12 AU20 Oct 201911.62.21 AU
C/2019 K1 (ATLAS)13.62.29 AU2.02 AU12 Feb 202013.62.01 AU24 Feb 202013.62.29 AU
C/2018 F4 (PANSTARRS)14.33.91 AU3.52 AU4 Dec 201914.13.44 AU7 May 201914.83.25 AU
88P/Howell14.61.74 AU2.48 AU26 Sep 20209.01.35 AU10 May 202011.71.08 AU
210P/Christensen15.01.98 AU1.01 AU7 Apr 202011.40.53 AU8 May 202012.81.08 AU
C/2017 K2 (PANSTARRS)15.49.87 AU9.74 AU20 Dec 20222.91.80 AU14 Jul 20224.41.81 AU
246P/NEAT15.42.62 AU3.42 AU22 Feb 202113.42.86 AU1 Jul 202112.71.95 AU
C/2019 N1 (ATLAS)15.53.70 AU3.76 AU1 Dec 202011.01.70 AU8 Feb 202111.01.91 AU
155P/Shoemaker16.01.13 AU2.10 AU15 Nov 201915.41.80 AU10 Feb 202015.71.11 AU
C/2010 U3 (Boattini)16.68.14 AU8.71 AU26 Feb 201916.48.45 AU28 Jan 201916.47.93 AU
124P/Mrkos16.70.84 AU1.75 AU26 Apr 202016.81.65 AU16 Mar 202016.50.79 AU
2P/Encke16.92.88 AU2.06 AU25 Jun 20203.20.34 AU30 Jul 20207.90.62 AU
249P/LINEAR19.01.16 AU2.05 AU29 Jun 202011.50.50 AU8 Jun 202012.00.43 AU
162P/Siding Spring19.53.37 AU2.95 AU7 Dec 202015.01.29 AU28 Oct 202014.90.87 AU
58P/Jackson-Neujmin20.52.60 AU1.73 AU25 May 202018.91.38 AU8 Dec 202021.11.66 AU
289P/Blanpain21.30.36 AU1.32 AU20 Dec 201918.30.96 AU11 Jan 202017.20.09 AU
11P/Tempel-Swift-LINEAR24.43.66 AU2.89 AU26 Nov 202017.11.39 AU3 Nov 202017.00.49 AU


For each of the listed comets, the current position is plotted in the below all-sky chart:





    Terminology:
            
    delta:      Distance between comet and earth in AU
    radius:     Distance between comet and sun in AU
    magn:       Magnitude (brightness) estimate    
    elong:      Elongation in degrees (angle sun-earth-comet)    
    AU:         Astronomical Unit (mean distance between earth and sun: 149597870.7 km
    Perihelion: On this date the comet (or other type of body) is closest to the sun
    

Orbital elements provided by MPC (Minor Planet Center).
Observations contributed by observers worldwide, via COBS (Comet Observation Database).
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.