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
C/2017 T2 (PANSTARRS)11.21.87 AU2.73 AU4 May 20208.41.62 AU29 Dec 20199.61.52 AU
C/2018 N2 (ASASSN)11.52.34 AU3.12 AU10 Nov 201911.73.12 AU20 Oct 201911.72.21 AU
260P/McNaught12.30.67 AU1.59 AU9 Sep 201912.31.42 AU4 Oct 201912.20.56 AU
C/2018 W2 (Africano)12.81.59 AU1.75 AU5 Sep 201910.11.45 AU27 Sep 20199.10.49 AU
29P/Schwassmann-Wachmann13.44.99 AU5.78 AU7 Mar 201913.35.77 AU9 Sep 201812.64.77 AU
68P/Klemola13.81.89 AU1.79 AU9 Nov 201913.81.79 AU13 Jul 201914.51.25 AU
C/2018 A6 (Gibbs)14.53.41 AU3.21 AU14 Jul 201913.93.02 AU17 Mar 201914.02.72 AU
C/2019 K1 (ATLAS)14.83.02 AU2.29 AU12 Feb 202013.62.01 AU24 Feb 202013.62.29 AU
114P/Wiseman-Skiff14.80.76 AU1.70 AU14 Jan 202014.41.58 AU4 Dec 201914.40.72 AU
2I/Borisov15.42.23 AU2.08 AU8 Dec 201915.02.01 AU28 Dec 201915.01.94 AU
155P/Shoemaker15.41.57 AU1.80 AU15 Nov 201915.41.80 AU10 Feb 202015.31.11 AU
289P/Blanpain16.20.35 AU1.09 AU20 Dec 201914.10.96 AU11 Jan 202013.00.09 AU
C/2019 N1 (ATLAS)16.34.68 AU4.69 AU1 Dec 20203.71.70 AU8 Feb 20214.51.91 AU
C/2010 U3 (Boattini)16.68.78 AU8.58 AU26 Feb 201916.48.45 AU28 Jan 201916.37.93 AU
88P/Howell17.83.66 AU3.09 AU26 Sep 20209.01.35 AU10 May 202011.51.08 AU
P/2008 Y12 (SOHO)23.12.00 AU1.07 AU9 Oct 2019-2.10.07 AU18 Aug 201923.10.69 AU
321P/SOHO23.82.27 AU1.58 AU17 Jan 20207.10.05 AU13 Feb 202016.30.23 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) or NASA JPL (Jet Propulsion Laboratory).
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.