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Comets

Browse and discover detailed information about 209 of the most interesting comets. Comets are listed in order of decreasing brightness.

Visibility from selected location  = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

Comet Leonard (C/2021 A1)

C/2021 A1 (Leonard)
C/2021 A1 (Leonard) is brighter than mag 10
R.A: 21h 36m 57s   Dec: -36° 10’ 50”
Observed Magnitude 7.3 (COBS)
Estimated Magnitude 13.1 (JPL)  fading
in Pisces Austrinus   object currently below the horizon

Comet 19P/Borrelly

19P/Borrelly
19P/Borrelly is brighter than mag 10
R.A: 01h 13m 34s   Dec: +00° 33’ 46”
Observed Magnitude 9.0 (COBS)
Estimated Magnitude 12.2 (JPL)  fading
in Cetus   current altitude less than 30 degrees above the horizon

Comet C/2019 L3 (ATLAS)

C/2019 L3 (ATLAS)
C/2019 L3 (ATLAS) is brighter than mag 10
R.A: 06h 47m 56s   Dec: +27° 49’ 09”
Observed Magnitude 9.0 (COBS)
Estimated Magnitude 12.3 (JPL) 
in Gemini   current altitude greater than 30 degrees above the horizon

Comet 67P/Churyumov-Gerasimenko

67P/Churyumov-Gerasimenko
67P/Churyumov-Gerasimenko is brighter than mag 10
R.A: 08h 35m 12s   Dec: +29° 04’ 26”
Observed Magnitude 9.4 (COBS)
Estimated Magnitude 13.5 (JPL)  fading
in Cancer   current altitude greater than 30 degrees above the horizon

Comet C/2017 K2 (PANSTARRS)

C/2017 K2 (PANSTARRS)
R.A: 18h 18m 15s   Dec: +11° 51’ 57”
Observed Magnitude 12.0 (COBS)
Estimated Magnitude 13.6 (JPL)  brightening
in Ophiucus   object currently below the horizon

Comet 4P/Faye

4P/Faye
R.A: 06h 20m 40s   Dec: +09° 33’ 13”
Observed Magnitude 12.2 (COBS)
Estimated Magnitude 14.5 (JPL)  fading
in Orion   current altitude greater than 30 degrees above the horizon

Comet C/2019 T4 (ATLAS)

C/2019 T4 (ATLAS)
R.A: 12h 07m 54s   Dec: -29° 34’ 10”
Observed Magnitude 13.0 (COBS)
Estimated Magnitude 14.0 (JPL)  brightening
in Hydra   object currently below the horizon

Comet C/2020 Y2 (ATLAS)

C/2020 Y2 (ATLAS)
R.A: 12h 12m 36s   Dec: -62° 43’ 04”
Observed Magnitude N.A. (COBS)
Estimated Magnitude 14.4 (JPL)  brightening
in Crux   object currently below the horizon

Comet C/2020 J1 (SONEAR)

C/2020 J1 (SONEAR)
R.A: 14h 25m 32s   Dec: +09° 14’ 33”
Observed Magnitude 14.4 (COBS)
Estimated Magnitude 16.3 (JPL) 
in Bootes   object currently below the horizon

Comet C/2021 E3 (ZTF)

C/2021 E3 (ZTF)
R.A: 19h 40m 29s   Dec: -11° 31’ 32”
Observed Magnitude N.A. (COBS)
Estimated Magnitude 14.6 (JPL)  brightening
in Aquila   object currently below the horizon

Comet ZTF (C/2020 V2)

C/2020 V2 (ZTF)
R.A: 13h 02m 13s   Dec: +47° 18’ 08”
Observed Magnitude 14.7 (COBS)
Estimated Magnitude 15.2 (JPL)  brightening
in Canes Venatici   current altitude less than 30 degrees above the horizon

Comet 108P/Ciffreo

108P/Ciffreo
R.A: 06h 41m 57s   Dec: +40° 40’ 01”
Observed Magnitude 14.9 (COBS)
Estimated Magnitude 17.9 (JPL)  fading
in Auriga   current altitude greater than 30 degrees above the horizon

Comet 116P/Wild 4

116P/Wild 4
R.A: 10h 02m 16s   Dec: +17° 30’ 55”
Observed Magnitude N.A. (COBS)
Estimated Magnitude 15.5 (JPL)  brightening
in Leo   current altitude less than 30 degrees above the horizon

Comet 22P/Kopff

22P/Kopff
R.A: 18h 11m 56s   Dec: -20° 58’ 38”
Observed Magnitude N.A. (COBS)
Estimated Magnitude 15.5 (JPL)  brightening
in Sagittarius   object currently below the horizon

Comet 29P/Schwassmann-Wachmann 1

29P/Schwassmann-Wachmann 1
R.A: 04h 15m 44s   Dec: +30° 05’ 24”
Observed Magnitude N.A. (COBS)
Estimated Magnitude 15.8 (JPL)  fading
in Taurus   current altitude greater than 30 degrees above the horizon

Comet 104P/Kowal 2

104P/Kowal 2
R.A: 01h 57m 00s   Dec: +02° 32’ 47”
Observed Magnitude N.A. (COBS)
Estimated Magnitude 15.8 (JPL)  fading
in Cetus   current altitude less than 30 degrees above the horizon

Comet C/2020 K1 (PANSTARRS)

C/2020 K1 (PANSTARRS)
R.A: 18h 34m 13s   Dec: +17° 32’ 49”
Observed Magnitude 15.8 (COBS)
Estimated Magnitude 16.4 (JPL)  brightening
in Hercules   object currently below the horizon

Comet 9P/Tempel 1

9P/Tempel 1
R.A: 16h 55m 20s   Dec: -19° 15’ 40”
Observed Magnitude N.A. (COBS)
Estimated Magnitude 15.9 (JPL)  brightening
in Ophiucus   object currently below the horizon

Comet 117P/Helin-Roman-Alu 1

117P/Helin-Roman-Alu 1
R.A: 17h 22m 39s   Dec: -24° 25’ 00”
Observed Magnitude N.A. (COBS)
Estimated Magnitude 15.9 (JPL) 
in Ophiucus   object currently below the horizon

Comet 110P/Hartley 3

110P/Hartley 3
R.A: 08h 11m 01s   Dec: +14° 32’ 11”
Observed Magnitude N.A. (COBS)
Estimated Magnitude 15.9 (JPL)  fading
in Cancer   current altitude greater than 30 degrees above the horizon
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