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
24P/Schaumasse10.31.46 AU1.21 AU16 Nov 201711.11.21 AU21 Apr 201818.21.33 AU
C/2017 O1 (ASASSN1)10.30.87 AU1.59 AU14 Oct 20178.81.50 AU18 Oct 20178.80.72 AU
62P/Tsuchinshan10.4*1.33 AU1.38 AU16 Nov 201712.91.38 AU16 Mar 201815.61.02 AU
96P/Machholz11.91.71 AU0.78 AU27 Oct 20172.40.12 AU23 Oct 20175.40.88 AU
C/2015 V2 (Johnson)12.33.14 AU2.64 AU12 Jun 20178.01.64 AU5 Jun 20178.00.81 AU
C/2016 R2 (PANSTARRS)12.42.24 AU3.15 AU9 May 201812.42.60 AU23 Dec 201711.92.05 AU
29P/Schwassmann-Wachmann12.95.94 AU5.81 AU13 Mar 201913.15.77 AU9 Sep 201812.44.77 AU
C/2015 ER61 (PANSTARRS)13.52.02 AU3.00 AU9 May 20177.71.04 AU19 Apr 20177.81.18 AU
65P/Gunn13.63.68 AU2.92 AU16 Oct 201713.42.91 AU30 May 201712.51.98 AU
C/2016 N4 (MASTER)13.93.01 AU3.26 AU16 Sep 201713.63.20 AU21 Sep 201713.62.76 AU
C/2015 O1 (PANSTARRS)14.34.52 AU3.81 AU19 Feb 201813.73.73 AU5 Apr 201813.53.23 AU
C/2016 N6 (PANSTARRS)14.43.88 AU3.62 AU18 Jul 201812.12.67 AU24 Dec 201812.32.37 AU
C/2016 M1 (PANSTARRS)14.94.25 AU3.62 AU10 Aug 201811.32.21 AU25 Jun 201810.71.29 AU
C/2017 K6 (Jacques)15.11.86 AU2.07 AU3 Jan 201814.92.00 AU17 Dec 201714.91.82 AU
185P/Petriew15.21.75 AU1.34 AU27 Jan 201811.30.93 AU17 Feb 201811.71.33 AU
71P/Clark15.62.09 AU2.06 AU30 Jun 201710.61.59 AU11 Jun 201710.60.59 AU
C/2017 T1 (Heinze)15.61.38 AU1.85 AU21 Feb 201810.30.58 AU5 Jan 20189.60.22 AU
145P/Shoemaker-Levy16.91.13 AU2.04 AU31 Aug 201717.31.90 AU26 Nov 201716.91.12 AU

* Potential outburst! (At least 2 magnitudes brighter than estimated in 3 or more observations of the past week) 

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).
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.