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
P/2021 T3 (PANSTARRS)17.020.81.26 AU2.13 AU27 Jul 202120.92.06 AU22 Sep 202120.61.19 AU
C/2021 T2 (Fuls)12.019.32.59 AU3.35 AU7 Jun 202213.81.24 AU6 Jul 202213.51.14 AU
C/2021 T1 (Lemmon)12.519.12.28 AU3.06 AU14 Oct 202119.13.06 AU5 Oct 202119.12.24 AU
C/2021 S4 (Tsuchinshan)6.520.17.43 AU8.42 AU26 Dec 202318.76.78 AU7 Dec 202318.65.84 AU
C/2021 S3 (PANSTARRS)5.519.58.26 AU8.73 AU11 Feb 20247.51.30 AU11 Mar 20247.51.34 AU
C/2021 S1 (ATLAS)7.018.85.90 AU6.18 AU29 Jan 202218.66.14 AU29 Dec 202118.55.30 AU
C/2021 R7 (PANSTARRS)10.521.64.85 AU5.80 AU15 Apr 202122.15.64 AU30 Sep 202121.54.79 AU
P/2021 R6 (Groeller)14.519.71.66 AU2.56 AU31 Oct 202119.72.55 AU17 Oct 202119.71.65 AU
P/2021 R5 (Rankin)12.019.22.40 AU3.35 AU12 Jan 202219.93.32 AU4 Oct 202119.12.37 AU
P/2021 R4 (Wierzchos)16.020.41.42 AU2.33 AU13 Oct 202120.42.33 AU4 Oct 202120.41.40 AU
P/2021 R3 (PANSTARRS)16.021.82.04 AU2.68 AU27 May 202121.82.53 AU17 Aug 202121.11.59 AU
C/2021 R2 (PANSTARRS)7.520.26.52 AU7.33 AU25 Dec 202120.57.31 AU21 Sep 202120.26.39 AU
P/2021 R1 (PANSTARRS)11.020.94.04 AU4.90 AU17 Dec 202121.34.89 AU17 Sep 202120.93.90 AU
C/2021 Q6 (PANSTARRS)6.020.99.17 AU10.09 AU21 Mar 202420.38.72 AU3 Sep 202419.97.78 AU
P/2021 Q5 (ATLAS)15.014.51.50 AU1.37 AU30 Aug 202114.11.23 AU4 Feb 202216.11.29 AU
C/2021 Q4 (Fuls)6.019.88.28 AU8.43 AU8 Jun 202319.27.57 AU17 Sep 202318.96.70 AU
C/2021 Q3 (ATLAS)8.018.85.20 AU5.26 AU25 Jan 202218.65.21 AU16 Jan 202218.64.87 AU
C/2021 P4 (ATLAS)9.518.13.34 AU3.96 AU30 Jul 202211.31.08 AU13 Jul 202211.41.96 AU
P/2021 P3 (PANSTARRS)14.020.52.13 AU3.03 AU30 May 202121.02.92 AU16 Sep 202120.21.98 AU
C/2021 P2 (PANSTARRS)9.020.55.22 AU6.14 AU21 Jan 202319.95.07 AU2 Sep 202219.34.30 AU
C/2021 P1 (PANSTARRS)11.020.73.84 AU4.75 AU1 Jun 202220.94.37 AU5 Oct 202120.73.81 AU
C/2021 O3 (PANSTARRS)10.517.32.58 AU3.31 AU21 Apr 20224.50.29 AU9 May 20226.50.60 AU
C/2021 O1 (Nishimura)10.512.62.40 AU1.42 AU13 Aug 20219.30.79 AU6 Aug 20219.41.70 AU
C/2021 N3 (PANSTARRS)8.520.56.02 AU6.43 AU18 Aug 202019.65.70 AU4 Jul 202019.54.79 AU
P/2021 N2 (Fuls)9.517.62.83 AU3.80 AU12 Nov 202117.63.80 AU30 Oct 202117.52.80 AU
P/2021 N1 (ZTF)19.022.61.39 AU1.93 AU6 Jun 202119.00.96 AU10 May 202119.20.99 AU
P/2021 L4 (PANSTARRS)13.521.94.08 AU3.45 AU4 Sep 201920.72.79 AU24 Feb 202019.51.93 AU
C/2021 L3 (Borisov)6.019.98.35 AU8.49 AU13 Feb 202219.98.46 AU24 Nov 202119.98.33 AU
P/2021 L2 (Leonard)17.020.91.40 AU2.08 AU24 Jul 202120.01.94 AU11 Aug 202120.01.04 AU
C/2021 K3 (Catalina)10.020.85.26 AU5.29 AU2 Feb 202221.15.23 AU28 Jun 202220.54.37 AU
C/2021 K2 (MASTER)8.019.25.73 AU5.47 AU9 Sep 202118.95.47 AU13 Jul 202118.74.56 AU
C/2021 K1 (ATLAS)11.016.42.03 AU2.96 AU4 May 202116.42.50 AU13 Sep 202116.01.87 AU
P/2021 J3 (ATLAS)7.019.06.18 AU6.40 AU4 Jul 201917.14.91 AU16 May 201916.93.94 AU
C/2021 J2 (PANSTARRS)12.022.55.71 AU4.71 AU22 Sep 202122.54.71 AU13 May 202121.73.83 AU
C/2021 J1 (Maury-Attard)15.523.53.70 AU3.29 AU19 Feb 202119.71.74 AU28 May 202119.31.30 AU
P/2021 HS (PANSTARRS)22.022.10.52 AU1.41 AU6 Aug 202117.30.80 AU13 Aug 202117.30.26 AU
C/2021 G3 (PANSTARRS)10.521.45.74 AU5.18 AU18 Oct 202121.45.18 AU5 Feb 202220.94.36 AU
C/2021 G2 (Atlas)8.518.19.14 AU9.08 AU10 Sep 202415.84.98 AU15 Apr 202415.24.23 AU
C/2021 G1 (Leonard)14.022.43.89 AU3.51 AU22 Jul 202122.43.42 AU12 Jan 202222.12.93 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).
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.