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/2018 H2 (PANSTARRS)16.619.31.30 AU2.29 AU23 Jan 201819.82.03 AU29 Apr 201819.01.21 AU
C/2018 F4 (PANSTARRS)7.819.15.19 AU5.96 AU1 Dec 201916.03.44 AU6 May 201916.33.25 AU
C/2018 F3 (Johnson)13.021.73.70 AU3.86 AU15 Aug 201719.22.48 AU3 Mar 201820.02.33 AU
C/2018 F1 (Grauer)11.517.93.07 AU3.58 AU14 Dec 201816.12.99 AU15 Apr 201818.52.88 AU
C/2018 EF9 (Lemmon)18.012.41.71 AU1.56 AU23 May 201820.81.56 AU14 Mar 201820.41.05 AU
C/2018 E2 (Barros)10.520.14.77 AU4.14 AU23 Dec 201719.43.92 AU18 Jan 201819.33.82 AU
C/2018 E1 (ATLAS)10.517.73.20 AU2.73 AU17 Apr 201817.52.71 AU6 Mar 201817.42.74 AU
C/2018 C2 (Lemmon)13.016.31.20 AU1.96 AU2 Jun 201816.31.96 AU24 May 201816.31.20 AU
P/2018 C1 (Lemmon-Read)13.519.92.60 AU2.69 AU25 Feb 201818.72.60 AU11 Feb 201818.71.62 AU
C/2018 B1 (Lemmon)9.020.16.11 AU5.13 AU30 Mar 201819.95.12 AU13 Dec 201719.54.24 AU
C/2018 A6 (Gibbs)9.018.94.58 AU4.60 AU14 Jul 201916.23.02 AU17 Mar 201916.22.72 AU
P/2018 A5 (PANSTARRS)15.022.83.54 AU3.23 AU23 Sep 201721.62.69 AU7 Jan 201820.81.86 AU
C/2018 A4 (PANSTARRS)14.020.43.31 AU2.40 AU18 May 201820.42.40 AU16 Nov 201720.32.06 AU
C/2018 A3 (ATLAS)8.517.43.91 AU3.92 AU12 Jan 201915.73.28 AU10 Jan 201915.72.61 AU
C/2018 A1 (PANSTARRS)12.521.23.59 AU3.28 AU20 Oct 201718.92.42 AU16 Jan 201818.91.94 AU
P/2017 Y3 (Leonard)16.520.61.56 AU1.90 AU11 Feb 201818.71.28 AU9 Feb 201818.71.44 AU
C/2017 Y2 (PANSTARRS)8.021.78.51 AU8.03 AU23 Apr 202118.55.18 AU11 Jun 202118.34.27 AU
C/2017 Y1 (PANSTARRS)11.521.14.93 AU4.40 AU31 Aug 201720.13.72 AU11 Jan 201819.52.98 AU
C/2017 X1 (PANSTARRS)10.019.54.49 AU4.66 AU14 Jun 201819.74.66 AU7 Mar 201819.33.91 AU
P/2017 W3 (Gibbs)10.519.13.35 AU3.88 AU25 Feb 201818.83.84 AU24 Mar 201818.72.86 AU
C/2017 W2 (Leonard)11.020.64.72 AU4.23 AU1 Nov 201720.13.96 AU29 Jan 201819.43.03 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).
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.