Recently discovered comets

The below table lists comets that have been discovered in the past 6 months.
For detailed information about a comet, click on its designation.

Comet(s) Today Perihelion Nearest approach
designation Hₒ magn delta radius date magn radius date magn delta
C/2019 Q4 (Borisov)10.917.73.24 AU2.66 AU8 Dec 201915.52.01 AU28 Dec 201915.51.94 AU
C/2019 Q3 (PANSTARRS)8.721.76.79 AU7.68 AU21 Aug 201821.37.25 AU13 Aug 201821.36.35 AU
A/2019 Q218.019.90.98 AU1.55 AU22 Jul 201920.31.26 AU28 Aug 201917.50.43 AU
A/2019 Q19.219.94.63 AU5.50 AU24 Jul 202019.74.97 AU3 Sep 202019.44.05 AU
A/2019 O412.821.23.08 AU3.84 AU9 Feb 202021.73.64 AU6 Sep 201921.13.04 AU
A/2019 O35.319.98.92 AU9.34 AU5 Mar 202119.88.82 AU23 Jul 202019.68.27 AU
A/2019 O24.520.411.47 AU11.59 AU21 Apr 202319.59.70 AU17 May 202319.59.07 AU
C/2019 N1 (ATLAS)6.818.15.20 AU5.17 AU1 Dec 202011.61.70 AU8 Feb 202111.71.91 AU
C/2019 M3 (ATLAS)11.819.72.82 AU3.67 AU3 Jan 201917.62.42 AU18 Dec 201817.62.43 AU
P/2019 M221.121.00.59 AU1.56 AU22 Jun 201917.11.06 AU17 Jun 201917.10.21 AU
C/2019 L3 (ATLAS)4.917.57.15 AU7.80 AU9 Jan 202211.83.55 AU7 Jan 202211.82.58 AU
C/2019 L2 (NEOWISE)15.121.62.76 AU2.67 AU2 Apr 201919.31.62 AU10 Jul 201918.71.27 AU
C/2019 L1 (PANSTARRS)13.419.82.29 AU2.91 AU11 Aug 201919.42.89 AU23 Jul 201919.41.89 AU
C/2019 K8 (ATLAS)11.319.23.52 AU3.25 AU21 Jul 201918.93.20 AU5 Jun 201918.93.13 AU
C/2019 K7 (Smith)6.416.04.37 AU4.98 AU16 Jun 202015.24.47 AU16 Jul 202015.23.65 AU
A/2019 K610.220.44.87 AU4.44 AU20 May 202018.93.93 AU1 May 202018.52.93 AU
C/2019 K5 (Young)11.615.41.58 AU2.30 AU22 Jun 201915.62.04 AU9 Oct 201915.61.55 AU
C/2019 K412.416.31.51 AU2.51 AU16 Jun 201917.12.26 AU17 Sep 201916.31.51 AU
C/2019 K1 (ATLAS)9.915.43.00 AU2.64 AU12 Feb 202013.62.01 AU24 Feb 202013.62.29 AU
C/2019 JU6 (ATLAS)14.721.03.07 AU2.44 AU1 Jun 201918.72.05 AU25 Jun 201918.41.29 AU
C/2019 J3 (ATLAS)13.419.62.93 AU2.44 AU1 Aug 201918.62.37 AU24 Jun 201918.01.40 AU
C/2019 J2 (Palomar)13.016.62.59 AU1.91 AU19 Jul 201915.31.73 AU14 Jul 201915.31.76 AU
C/2019 J1 (Lemmon)13.119.82.43 AU3.02 AU9 Apr 201918.92.48 AU3 Jul 201918.41.67 AU
C/2019 H1 (NEOWISE)15.521.92.98 AU2.57 AU27 Apr 201918.81.84 AU22 May 201918.61.22 AU
P/2019 GG21 (PANSTARRS)13.022.24.71 AU3.84 AU3 Jul 201921.73.81 AU27 Mar 201921.22.87 AU
A/2019 G413.021.57.21 AU6.31 AU8 Nov 201821.45.94 AU17 Mar 201920.85.19 AU
A/2019 G317.123.94.83 AU3.87 AU3 Dec 201822.72.86 AU18 Apr 201921.72.13 AU
A/2019 G216.521.43.40 AU2.46 AU9 Dec 201920.62.29 AU11 Jan 202019.71.45 AU
P/2019 G1 (PANSTARRS)12.519.43.60 AU3.11 AU6 Jun 201918.33.05 AU27 Apr 201918.12.07 AU
C/2019 F2 (ATLAS)12.016.63.22 AU2.24 AU8 Sep 201916.62.23 AU14 Feb 201917.32.26 AU
C/2019 F1 (ATLAS-Africano)5.517.57.36 AU6.52 AU22 Jun 202113.03.60 AU21 Jun 202113.03.05 AU
C/2019 E3 (ATLAS)2.519.313.72 AU13.01 AU15 Nov 202317.710.28 AU25 Aug 202417.710.04 AU

For possible comets still needing confirmation, see http://www.minorplanetcenter.net/iau/NEO/pccp_tabular.html



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
    Hₒ:         Absolute magnitude (magnitude from a distance of 1 AU) 
    

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.