Bright comets in the coming 3 months

The below table lists all comets that are expected to become brighter than magnitude 14 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
21P/Giacobini-Zinner7.90.42 AU1.03 AU10 Sep 20187.21.01 AU11 Sep 20187.20.39 AU
C/2016 M1 (PANSTARRS)10.12.46 AU2.27 AU10 Aug 20189.32.21 AU25 Jun 20188.71.29 AU
C/2017 S3 (PANSTARRS)11.32.02 AU1.07 AU15 Aug 20181.30.21 AU7 Aug 20183.80.76 AU
38P/Stephan-Oterma11.61.28 AU1.70 AU10 Nov 201810.51.59 AU17 Dec 201810.50.77 AU
46P/Wirtanen12.20.55 AU1.48 AU12 Dec 20184.91.06 AU17 Dec 20184.80.08 AU
C/2016 N6 (PANSTARRS)12.33.35 AU2.76 AU18 Jul 201812.42.67 AU24 Dec 201812.52.37 AU
64P/Swift-Gehrels12.30.52 AU1.48 AU3 Nov 201810.91.39 AU28 Oct 201810.90.44 AU
C/2017 T3 (ATLAS)12.62.16 AU1.43 AU19 Jul 20189.20.83 AU1 Aug 20189.21.35 AU
C/2016 R2 (PANSTARRS)12.63.55 AU2.97 AU9 May 201811.72.60 AU23 Dec 201711.42.05 AU
48P/Johnson13.01.13 AU2.03 AU12 Aug 201812.72.00 AU20 Aug 201812.71.01 AU
C/2018 L2 (ATLAS)13.12.47 AU1.94 AU2 Dec 201811.91.71 AU17 Jun 201815.91.95 AU
P/2013 R3-A (Catalina-PANSTARRS)13.41.49 AU2.25 AU6 Dec 201814.22.20 AU12 Aug 201813.21.30 AU
P/2013 R3-B (Catalina-PANSTARRS)13.41.49 AU2.25 AU6 Dec 201814.22.20 AU12 Aug 201813.21.30 AU
C/2018 N1 (NEOWISE)13.82.00 AU1.52 AU1 Aug 20189.61.31 AU27 Jul 20189.10.31 AU
29P/Schwassmann-Wachmann13.94.80 AU5.77 AU8 Mar 201913.35.77 AU9 Sep 201812.54.77 AU
59P/Kearns-Kwee14.52.45 AU2.36 AU16 Sep 201814.62.36 AU11 Jan 201914.01.55 AU
78P/Gehrels14.61.66 AU2.51 AU2 Apr 201913.92.01 AU6 Sep 201814.81.63 AU
123P/West-Hartley15.62.74 AU2.37 AU5 Feb 201912.72.13 AU28 Feb 201912.61.20 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.