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/2018 R5 (Lemmon)11.519.52.83 AU3.73 AU9 Jan 201920.23.62 AU28 Sep 201819.52.82 AU
C/2018 R4 (Fuls)14.020.02.06 AU3.03 AU3 Mar 201817.81.71 AU21 Aug 201819.41.95 AU
C/2018 R3 (Lemmon)11.519.32.81 AU3.60 AU7 Jun 201914.11.29 AU23 May 201914.11.92 AU
C/2018 P5 (PANSTARRS)11.020.83.87 AU4.68 AU25 Feb 201921.54.58 AU22 Aug 201820.83.73 AU
P/2018 P4 (PANSTARRS)12.019.92.68 AU3.68 AU7 Nov 201820.13.67 AU16 Sep 201819.92.67 AU
P/2018 P3 (PANSTARRS)17.519.40.78 AU1.76 AU9 Oct 201819.51.76 AU22 Sep 201819.40.78 AU
C/2018 O1 (ATLAS)17.020.41.88 AU1.59 AU31 Aug 201819.51.56 AU1 Aug 201818.30.70 AU
C/2018 N2 (ASASSN)6.013.94.36 AU4.95 AU11 Nov 201911.53.13 AU20 Oct 201911.42.21 AU
C/2018 N1 (NEOWISE)15.513.82.00 AU1.52 AU1 Aug 20189.61.31 AU27 Jul 20189.10.31 AU
C/2018 M1 (Catalina)15.518.51.40 AU1.68 AU10 Jul 201817.11.30 AU24 Jul 201817.21.23 AU
P/2018 L5 (Leonard)14.519.31.49 AU2.49 AU4 May 201820.12.30 AU9 Sep 201819.21.46 AU
P/2018 L4 (PANSTARRS)17.520.71.25 AU1.77 AU31 Jul 201819.71.68 AU17 Jul 201819.60.86 AU
C/2018 L2 (ATLAS)10.013.12.47 AU1.94 AU2 Dec 201811.91.71 AU17 Jun 201815.91.95 AU
P/2018 L1 (PANSTARRS)15.019.22.27 AU1.94 AU12 Nov 201819.31.89 AU11 May 201819.21.49 AU
C/2018 KJ3 (Lemmon)12.218.94.58 AU4.76 AU9 Sep 201918.03.63 AU11 Jun 201917.22.74 AU
C/2018 K1 (Weiland)14.921.03.48 AU2.72 AU6 Apr 201818.41.88 AU9 Jun 201817.11.02 AU
P/2018 H2 (PANSTARRS)16.621.63.04 AU2.86 AU23 Jan 201819.82.03 AU29 Apr 201819.01.21 AU
C/2018 F3 (Johnson)13.023.65.71 AU4.77 AU15 Aug 201719.22.48 AU3 Mar 201820.02.33 AU
C/2018 F1 (Grauer)11.516.63.84 AU3.10 AU14 Dec 201816.12.99 AU15 Apr 201818.52.88 AU
C/2018 EF9 (Lemmon)18.021.51.63 AU2.25 AU23 May 201820.01.56 AU14 Mar 201819.61.05 AU
C/2018 EN4 (NEOWISE)15.022.62.22 AU2.03 AU7 Jun 201818.51.45 AU6 Mar 201820.81.33 AU
C/2018 E2 (Barros)10.520.34.45 AU4.57 AU23 Dec 201719.43.92 AU18 Jan 201819.43.82 AU
C/2018 E1 (ATLAS)10.518.73.96 AU3.14 AU17 Apr 201817.52.71 AU6 Mar 201817.42.74 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.