Latest image

Comet C/2020 M3 (ATLAS)
Comet C/2020 M3 (ATLAS), obtained on 2020 Nov. 21 (21h49-22h22UT) with 19-cm, f/4 Flat Field Camera and astro modified Canon EOS 700D DSLR. Exposure time was 30x60 seconds at ISO 3200.
Copyright © 2020 by H. Mikuz, Črni Vrh Observatory.

Welcome to COBS!

Comet Observation database (COBS) saw first light in 2010 and is maintained by Crni Vrh Observatory. It is a free and unique service for comet observers worldwide which allows submission, display and analysis of comet data in a single location.

Amateur astronomers can make valuable contributions to comet science by observing comets and submitting their observations to COBS as professional astronomers typically do not have telescope time required to acquire regular observations. We therefore encourage comet observers worldwide to submit their observations and contribute to the COBS database.

Registered observers may submit observations using a web based form which which stores the observations in an SQL database and stores them in ICQ format. Observations may be queried and plotted in the web site or exported for further processing, analysis and publication. The database currently contains more than 256000 comet observations of more than 1400 different comets and represents the largest available database of comet observations.

The data stored in COBS is freely available to everyone who honors our data usage policy. Please cite COBS as the reference if you use it for comet studies.

Latest lightcurve

Light-curve of C/2020 S3 (Erasmus) (Jan 18, 2021).

Type Comet name Obs date Mag App T Pow Dia DC Tail PA Obs
C C/2020 V2 2021 01 17.23 17.3 50.0 L A080 0.4 HILaa
V C/2020 M3 2021 01 16.85 10.5 20.3 T 77 4 2 GON05
V 156P 2021 01 16.83 10.8 20.3 T 100 3 3 GON05
V 398P 2021 01 16.82 11.2 20.3 T 100 4 2 GON05
V 141P 2021 01 16.81 10.2 20.3 T 100 4 2/ GON05
V 88P 2021 01 16.80 10.0 20.3 T 77 5 2/ GON05
V P/2016 J3 2021 01 16.78 9.7 20.3 T 100 5 2/ GON05
C 141P 2021 01 16.73 10.0 30.0 A a 60 2 PAP04
C 88P 2021 01 16.73 11.9 30.0 A a 60 1 PAP04
C P/2016 J3 2021 01 16.72 11.0 30.0 A a 60 2 PAP04
C C/2021 A1 2021 01 16.25 18.6 43.0 T a750 PAUaa
C 398P 2021 01 15.19 13.5 35.0 T a750 0.5 5 PAUaa
C C/2021 A2 2021 01 14.34 12.4 35.0 T a750 1.25 7 25.2s 55 PAUaa
C C/2020 T2 2021 01 14.25 15.0 50.0 L a600 0.6 HILaa
C C/2020 V2 2021 01 14.22 17.2 50.0 L A080 0.4 HILaa
C 117P 2021 01 14.21 16.8 50.0 L a600 0.4 HILaa
C 405P 2021 01 14.20 17.5 50.0 L a600 0.4 HILaa
C C/2020 U5 2021 01 14.20 19.1 50.0 L a180 0.4 HILaa
C 9P 2021 01 14.19 19.0 50.0 L a600 0.4 HILaa
C 141P 2021 01 14.07 10.4 10.6 R a540 12 0.34 68 LEHaa


Comet Observing Planner

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Current comet magnitudes and observable region

Comet name Mag Trend Observable Visiblity
C/2020 X3 (SOHO) 8.5 fade 27N to 90S Never up Never up
323P/SOHO 8.5 steady 69N to 90S Poor elongation Poor elongation
C/2020 S3 (Erasmus) 8.5 fade 81N to 90S Poor elongation Poor elongation
141P/Machholz 11.0 fade 84N to 90S Evening Evening
156P/Russell-LINEAR 11.5 fade 90N to 57S Best evening Early evening
C/2020 M3 (ATLAS) 11.5 fade 90N to 42S All night Never up
C/2019 N1 (ATLAS) 12.0 steady 34N to 90S Never up Never up
10P/Tempel 12.0 bright 71N to 90S Poor elongation Poor elongation
398P/Boattini 12.5 fade 90N to 80S Best evening Best evening
C/2019 Y4 (ATLAS) 12.5 fade 85N to 90S Best evening Best morning
29P/Schwassmann-Wachmann 13.0 steady 90N to 66S Best evening Evening
7P/Pons-Winnecke 13.0 bright 90N to 80S Early evening Early evening
P/2016 J3 (STEREO) 13.0 bright 76N to 90S Evening Early evening
D/1978 R1 (Haneda-Campos) 13.5 fade 90N to 73S Best morning Best morning
P/2013 PA104 (PANSTARRS) 13.5 fade 84N to 90S Best evening Best evening
C/2019 L3 (ATLAS) 13.5 steady 90N to 35S All night Never up
88P/Howell 13.5 fade 81N to 90S Evening Early evening
75D/Kohoutek 13.5 fade 90N to 71S Best evening Evening
28P/Neujmin 14.0 bright 64N to 90S Poor elongation Poor elongation
246P/NEAT 14.0 bright 70N to 90S Early evening Early evening

The observable region is an approximate indication of the latitude at which the comet may be seen. The period when visible is calculated for latitude 45°N and 45°S.

Latest news

Dec. 20, 2020

Recently discovered comet seen during 2020 total solar eclipse

As Chile and Argentina witnessed the total solar eclipse on Dec. 14, 2020, unbeknownst to skywatchers, a little tiny speck was flying past the Sun -- a recently discovered comet.


Dec. 10, 2020

Comet Discovered to Have Its Own Northern Lights

An atmospheric light show previously relegated to planets and Jupiter moons is found on comet using data from ESA's Rosetta spacecraft.


Oct. 29, 2020

Philae’s second touchdown site discovered at ‘skull-top’ ridge

After years of detective work, the second touchdown site of Rosetta’s Philae lander has been located on Comet 67P/Churyumov-Gerasimenko in a site that resembles the shape of a skull. Philae left its imprint in billions-of-years-old ice, revealing that the comet’s icy interior is softer than cappuccino froth.


Sep. 22, 2020

QHYCCD Camera type keys

In order to unify the camera type abbreviation keys of all QHYCCD camera models, we had to change some of the currently used camera type keys.


Sep. 21, 2020

Comet discovered to have its own northern lights

Comet 67P/Churyumov-Gerasimenko has its own far-ultraviolet aurora, data reveal. It is the first time such electromagnetic emissions in the far-ultraviolet have been documented on a celestial object other than a planet or moon.