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/2023 H3 (PANSTARRS) AU5.45 AU18 Feb 202420.95.23 AU9 Jun 202420.44.26 AU
C/2023 H2 (Lemmon) AU2.50 AU29 Oct 202312.00.89 AU11 Nov 202310.00.19 AU
C/2023 H1 (PANSTARRS)12.624.35.62 AU6.18 AU28 Nov 202422.74.44 AU3 Jun 202422.23.73 AU
C/2023 F2 (SOHO) AU1.89 AU21 Mar 2023-5.20.04 AU25 Mar 20232.70.95 AU
C/2023 F1 (PANSTARRS) AU1.74 AU28 Jun 202321.11.71 AU24 Apr 202319.80.92 AU
C/2023 E1 (ATLAS)15.711.20.76 AU1.13 AU1 Jul 20239.51.03 AU18 Aug 202311.50.37 AU
C/2023 C2 (ATLAS)10.822.15.52 AU5.79 AU16 Nov 202416.92.37 AU21 Jul 202416.72.07 AU
P/2023 B3 (PANSTARRS)10.520.75.03 AU4.72 AU3 Sep 202019.23.98 AU3 Nov 202018.93.01 AU
C/2023 B2 (ATLAS)14.316.31.28 AU2.05 AU10 Mar 202315.01.74 AU13 Apr 202314.80.87 AU
P/2023 B1 (PANSTARRS)5.517.36.20 AU6.14 AU28 Apr 202317.26.14 AU25 Feb 202317.05.19 AU
C/2023 A3 (Tsuchinshan-ATLAS) AU6.41 AU27 Sep 20240.70.39 AU13 Oct 20240.00.47 AU
C/2023 A2 (SWAN)13.518.62.04 AU2.28 AU20 Jan 202314.50.95 AU25 Nov 202215.61.47 AU
C/2023 A1 (Leonard)14.518.22.63 AU2.06 AU18 Mar 202316.11.83 AU2 Mar 202316.01.19 AU
C/2022 Y2 (Lemmon)15.622.63.62 AU2.64 AU22 Mar 202321.62.54 AU31 Jan 202320.81.66 AU
C/2022 Y1 (Hogan) AU3.37 AU27 Nov 202215.52.96 AU9 Jan 202315.32.00 AU

For possible comets still needing confirmation, see

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
    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.