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
342P/SOHO6.60.95 AU0.06 AU19 Oct 20217.10.05 AU23 Aug 202121.30.83 AU
67P/Churyumov-Gerasimenko10.30.44 AU1.22 AU2 Nov 202110.11.21 AU12 Nov 202110.10.42 AU
8P/Tuttle10.41.97 AU1.29 AU27 Aug 20218.51.03 AU12 Sep 20218.71.81 AU
29P/Schwassmann-Wachmann10.65.25 AU5.92 AU31 Mar 201911.05.77 AU9 Sep 201810.34.78 AU
C/2019 L3 (ATLAS)10.73.41 AU3.63 AU9 Jan 20229.93.55 AU6 Jan 20229.92.58 AU
4P/Faye11.31.08 AU1.67 AU8 Sep 202111.51.62 AU5 Dec 202111.90.94 AU
C/2017 K2 (PANSTARRS)12.55.45 AU5.05 AU19 Dec 20227.11.80 AU14 Jul 20227.81.81 AU
C/2021 A1 (Leonard)12.61.96 AU1.59 AU3 Jan 20227.10.62 AU12 Dec 20213.10.23 AU
C/2021 O1 (Nishimura)12.72.42 AU1.43 AU13 Aug 20219.30.79 AU6 Aug 20219.41.70 AU
19P/Borrelly13.01.21 AU1.78 AU1 Feb 20229.61.31 AU11 Dec 202110.61.17 AU
C/2019 T4 (ATLAS)13.45.39 AU4.66 AU9 Jun 202212.14.24 AU4 Apr 202211.83.33 AU
C/2020 T2 (Palomar)13.62.88 AU2.37 AU11 Jul 202110.52.05 AU12 May 202110.91.41 AU
6P/d'Arrest14.01.01 AU1.40 AU17 Sep 202113.21.35 AU2 Aug 202113.80.75 AU
132P/Helin-Roman-Alu14.30.75 AU1.71 AU13 Nov 202114.51.69 AU9 Oct 202114.30.74 AU
P/2021 Q5 (ATLAS)14.51.50 AU1.37 AU30 Aug 202114.11.23 AU4 Feb 202216.11.29 AU
108P/Ciffreo14.61.15 AU1.70 AU10 Sep 202114.71.66 AU9 Dec 202115.60.98 AU
C/2020 PV6 (PANSTARRS)14.82.87 AU2.31 AU25 Sep 202114.52.30 AU19 Jul 202113.81.67 AU
C/2020 Y2 (ATLAS)15.84.75 AU3.89 AU17 Jun 202214.23.13 AU19 Mar 202214.02.92 AU
C/2020 U5 (PANSTARRS)15.94.05 AU4.11 AU27 Apr 202215.03.76 AU28 Dec 202115.03.39 AU
104P/Kowal15.90.77 AU1.53 AU11 Jan 202212.11.07 AU28 Jan 202212.30.64 AU
C/2020 V2 (ZTF)16.06.73 AU6.08 AU8 May 202310.12.23 AU17 Sep 20239.71.86 AU
116P/Wild17.22.98 AU2.83 AU17 Jul 202214.12.20 AU23 Feb 202213.81.44 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.