Objects in your sky: Comets

by Dominic Ford

Below is a list of the brightest few comets that are visible at present.

You are welcome to reproduce the text below for non-profit purposes, providing you credit In-The-Sky.org.

Comet name Mag Constellation Separation
from Sun
Trend Absolute magnitude
last updated
Comet name Mag Constellation Separation
from Sun
Trend Absolute magnitude
last updated
C/2019 U6 (Lemmon)4.9Canis Major53°
Brightening
(peak at mag 3.7 on 22 Jun 2020)
1 May 2020
A/2019 U66.0Canis Major55°
Brightening
(peak at mag 4.9 on 22 Jun 2020)
3 Jun 2020
C/2020 F3 (NEOWISE)6.3Orion29°
Brightening
(peak at mag -2.6 on 4 Jul 2020)
3 Jun 2020
C/2017 T2 (PANSTARRS)8.8Ursa Major72°
Fading
(peak at mag 8.7 on 15 May 2020)
23 May 2020
2P/Encke9.4Taurus
Brightening
(peak at mag 6.0 on 27 Jun 2020)
14 Mar 2017
58P/Jackson-Neujmin10.2Cetus40°
Fading
(peak at mag 10.1 on 2 Jun 2020)
3 Jun 2020
88P/Howell10.4Virgo117°
Brightening
(peak at mag 8.6 on 17 Sep 2020)
1 Apr 2018
C/2018 N2 (ASASSN)13.3Cassiopeia54°
Fading
3 Jun 2020
84P/Giclas13.7Aries27°
Brightening
(peak at mag 13.7 on 16 Jun 2020)
8 Feb 2017
74P/Smirnova-Chernykh14.0Sagittarius144°
Brightening
(peak at mag 14.0 on 24 Jun 2020)
29 Feb 2012
210P/Christensen14.0Cancer61°
Fading
(peak at mag 12.0 on 15 Apr 2020)
28 Mar 2009
C/2019 N1 (ATLAS)14.1Draco76°
Brightening
(peak at mag 11.5 on 8 Jan 2021)
3 Jun 2020
69P/Taylor14.9Coma Berenices102°
Fading
Unknown
246P/NEAT15.0Coma Berenices108°
Fading
3 Jun 2020
C/2016 R2 (PANSTARRS)15.0Hercules139°
Fading
3 Jun 2019
110P/Hartley15.4Pegasus71°
Brightening
(peak at mag 13.8 on 21 Oct 2020)
29 Feb 2012
67P/Churyumov-Gerasimenko15.5Sagittarius154°
Brightening
1 Apr 2018
4P/Faye15.7Scutum152°
Brightening
14 Sep 2017
C/2014 S2 (PANSTARRS)16.3Centaurus121°
Fading
3 Aug 2016
124P/Mrkos16.3Sextans91°
Fading
14 Sep 2017
78P/Gehrels16.3Leo68°
Fading
24 Dec 2016
168P/Hergenrother16.5Lynx46°
Fading
15 Jan 2013
10P/Tempel16.5Coma Berenices102°
Brightening
1 Apr 2018
38P/Stephan-Oterma16.8Virgo120°
Fading
3 Mar 2019
C/2017 M4 (ATLAS)17.1Carina100°
Fading
3 Jun 2019

The position of each comet is calculated from orbital elements published by the Minor Planet Center (MPC).

The brightnesses of comets are estimated from magnitude parameters published by the BAA Comet Section, where these are available. These are computed from the observations they receive from amateur astronomers.

Comets are intrinsically highly unpredictable objects, since their brightness depends on the scattering of sunlight from dust particles in the comet's coma and tail. This dust is continually streaming away from the comet's nucleus, and its density at any particular time is governed by the rate of sublimation of the ice in the comet's nucleus, as it is heated by the Sun's rays. It also depends on the amount of dust that is mixed in with that ice. This is very difficult to predict in advance, and can be highly variable even between successive apparitions of the same comet.

In consequence, while the future positions of comets are usually known with a high degree of confidence, their future brightnesses are not. For most comets, we do not publish any magnitude estimates at all. For the few comets where we do make estimates, we generally prefer the BAA's magnitude parameters to those published by the Minor Planet Center, since they are typically updated more often.

Cambridge

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Longitude:
Timezone:

42.38°N
71.11°W
EDT

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