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
C/2016 M1 (PANSTARRS)9.31.55 AU2.38 AU10 Aug 20189.62.21 AU25 Jun 20189.01.29 AU
66P/du Toit10.70.90 AU1.29 AU19 May 201810.91.29 AU18 May 201810.90.90 AU
C/2016 R2 (PANSTARRS)11.83.36 AU2.61 AU9 May 201811.82.60 AU23 Dec 201711.42.05 AU
37P/Forbes11.91.30 AU1.62 AU4 May 201812.61.61 AU18 Aug 201812.60.98 AU
C/2016 N6 (PANSTARRS)12.33.23 AU2.73 AU18 Jul 201812.42.67 AU24 Dec 201812.62.37 AU
C/2018 EF9 (Lemmon)12.4*1.71 AU1.56 AU23 May 201820.81.56 AU14 Mar 201820.41.05 AU
29P/Schwassmann-Wachmann12.85.95 AU5.78 AU9 Mar 201913.15.77 AU9 Sep 201812.44.77 AU
C/2017 T3 (ATLAS)12.92.27 AU1.28 AU19 Jul 201810.20.83 AU1 Aug 201810.21.35 AU
C/2015 O1 (PANSTARRS)13.33.65 AU3.83 AU19 Feb 201813.23.73 AU5 Apr 201813.03.23 AU
P/2013 R3-A (Catalina-PANSTARRS)14.41.94 AU2.47 AU6 Dec 201814.22.20 AU12 Aug 201813.21.30 AU
P/2013 R3-B (Catalina-PANSTARRS)14.41.94 AU2.48 AU6 Dec 201814.22.20 AU12 Aug 201813.21.30 AU
C/2017 M4 (ATLAS)14.63.58 AU3.94 AU18 Jan 201913.83.25 AU14 May 201913.02.48 AU
21P/Giacobini-Zinner15.01.23 AU1.74 AU10 Sep 20189.11.01 AU11 Sep 20189.10.39 AU
364P/PANSTARRS15.50.58 AU0.93 AU24 Jun 201813.80.80 AU19 Jul 201813.40.24 AU
C/2017 S3 (PANSTARRS)16.32.36 AU1.89 AU15 Aug 20187.50.21 AU7 Aug 20188.80.76 AU
38P/Stephan-Oterma16.63.10 AU2.56 AU10 Nov 20189.91.59 AU17 Dec 20189.90.77 AU
46P/Wirtanen17.82.46 AU2.48 AU12 Dec 20183.81.06 AU17 Dec 20183.70.08 AU

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

    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).
UCAC4 star catalog and NGC2000 dso catalog via VizieR as provided by the Strasbourg astronomical Data Center.
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.