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/2017 R1 (PANSTARRS)13.520.72.42 AU3.40 AU8 Apr 201721.73.33 AU9 Sep 201720.72.38 AU
C/2017 P2 (PANSTARRS)15.021.32.67 AU2.58 AU6 Dec 201721.32.46 AU19 Jul 201721.72.60 AU
P/2017 P1 (PANSTARRS)10.020.94.85 AU5.54 AU17 Jun 201821.05.44 AU13 Sep 201820.64.45 AU
C/2017 O1 (ASASSN1)13.09.70.81 AU1.52 AU14 Oct 20178.41.50 AU18 Oct 20178.40.72 AU
C/2017 M5 (TOTAS)6.518.46.10 AU6.24 AU2 Jun 201818.05.99 AU6 Aug 201817.85.04 AU
C/2017 M4 (ATLAS)6.016.95.26 AU5.42 AU18 Jan 201914.13.25 AU14 May 201913.32.48 AU
C/2017 M3 (PANSTARRS)10.521.05.53 AU4.81 AU2 May 201720.54.67 AU13 Mar 201821.04.45 AU
C/2017 K6 (Jacques)11.016.22.02 AU2.33 AU3 Jan 201815.32.00 AU17 Dec 201715.31.82 AU
C/2017 K5 (PANSTARRS)7.021.69.46 AU9.39 AU8 Mar 202020.47.62 AU3 Jul 202020.06.64 AU
C/2017 K4 (ATLAS)10.016.82.83 AU2.85 AU8 Jan 201817.02.65 AU3 Jul 201716.92.31 AU
P/2017 K3 (Gasparovic)14.520.52.49 AU2.53 AU31 May 201718.82.33 AU29 May 201718.81.32 AU
C/2017 K2 (PANSTARRS)1.519.315.44 AU15.36 AU21 Dec 20226.11.81 AU14 Jul 20227.11.83 AU
C/2017 K1 (PANSTARRS)7.020.28.02 AU7.35 AU25 Mar 201819.77.26 AU30 Apr 201819.66.26 AU
C/2017 G3 (PANSTARRS)14.021.94.00 AU3.10 AU15 Apr 201719.32.59 AU17 Apr 201719.31.68 AU
P/2017 G2 (PANSTARRS)13.020.63.68 AU2.97 AU13 Jun 201719.82.85 AU5 Mar 201719.62.41 AU
P/2017 G1 (PANSTARRS)13.523.95.55 AU4.67 AU14 May 201620.22.62 AU19 Dec 201519.61.94 AU
C/2017 F2 (PANSTARRS)7.520.47.81 AU6.94 AU22 Nov 201720.36.93 AU31 Mar 201819.96.08 AU
C/2017 F1 (Lemmon)10.520.54.86 AU4.50 AU8 Dec 201719.84.46 AU24 Dec 201719.83.66 AU
C/2017 E5 (Lemmon)13.024.36.15 AU5.42 AU10 Jun 201616.11.78 AU8 Jun 201616.11.29 AU
C/2017 E4 (Lovejoy)17.015.92.32 AU2.76 AU23 Apr 20177.20.49 AU31 Mar 20177.60.61 AU
C/2017 E3 (PANSTARRS)6.518.46.81 AU5.97 AU31 May 201717.85.92 AU25 Apr 201717.75.06 AU
C/2017 E2 (Tsuchinshan)11.522.76.23 AU5.26 AU12 May 201617.42.35 AU23 Oct 201518.32.32 AU
C/2017 E1 (Borisov)14.025.52.14 AU2.73 AU10 Apr 20179.80.90 AU18 Mar 201711.01.32 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.