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
8P/Tuttle9.41.83 AU1.11 AU27 Aug 20218.81.03 AU12 Sep 20219.01.81 AU
67P/Churyumov-Gerasimenko11.00.53 AU1.30 AU2 Nov 202110.01.21 AU12 Nov 202110.00.42 AU
C/2019 L3 (ATLAS)11.03.79 AU3.68 AU9 Jan 20229.93.55 AU6 Jan 20229.92.58 AU
C/2021 O1 (Nishimura)11.32.09 AU1.11 AU13 Aug 20219.30.79 AU6 Aug 20219.41.70 AU
4P/Faye11.51.21 AU1.63 AU8 Sep 202111.61.62 AU5 Dec 202111.80.94 AU
C/2020 T2 (Palomar)12.62.54 AU2.24 AU11 Jul 202110.52.05 AU12 May 202110.91.41 AU
C/2017 K2 (PANSTARRS)12.75.42 AU5.25 AU19 Dec 20227.21.80 AU14 Jul 20227.91.81 AU
C/2019 T4 (ATLAS)13.55.57 AU4.74 AU9 Jun 202212.04.24 AU4 Apr 202211.73.33 AU
29P/Schwassmann-Wachmann13.95.58 AU5.92 AU30 Mar 201914.25.77 AU9 Sep 201813.44.78 AU
19P/Borrelly14.01.25 AU1.96 AU1 Feb 20228.91.31 AU11 Dec 202110.01.17 AU
C/2021 A1 (Leonard)14.12.59 AU1.94 AU3 Jan 20227.20.62 AU12 Dec 20213.20.23 AU
108P/Ciffreo14.31.30 AU1.67 AU10 Sep 202114.51.66 AU9 Dec 202115.30.97 AU
6P/d'Arrest14.50.86 AU1.36 AU17 Sep 202114.41.35 AU2 Aug 202115.30.75 AU
246P/NEAT14.72.75 AU3.08 AU23 Feb 202114.32.86 AU1 Jul 202113.51.94 AU
10P/Tempel14.71.74 AU2.26 AU24 Mar 202111.11.41 AU3 Nov 202115.51.61 AU
C/2020 F5 (MASTER)14.93.75 AU4.59 AU24 Mar 202115.34.33 AU21 Aug 202114.83.57 AU
C/2020 PV6 (PANSTARRS)14.92.54 AU2.30 AU25 Sep 202115.02.30 AU19 Jul 202114.31.67 AU
C/2019 F1 (ATLAS-Africano)15.03.47 AU3.70 AU22 Jun 202114.63.60 AU21 Jun 202114.63.05 AU
15P/Finlay15.21.49 AU1.42 AU13 Jul 202110.80.99 AU17 Jun 202111.41.09 AU
104P/Kowal15.30.80 AU1.73 AU11 Jan 202210.71.07 AU28 Jan 202210.80.64 AU
C/2020 Y2 (ATLAS)15.74.88 AU4.02 AU17 Jun 202213.83.13 AU19 Mar 202213.72.92 AU
P/2021 Q5 (ATLAS)16.91.50 AU1.27 AU30 Aug 202116.81.23 AU4 Feb 202218.81.29 AU
342P/SOHO18.90.86 AU0.84 AU19 Oct 20217.10.05 AU23 Aug 202121.30.83 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.