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 22, 2021).

Type Comet name Obs date Mag App T Pow Dia DC Tail PA Obs
C 141P 2021 01 19.73 10.3 30.0 A a 30 3 PAP04
C 156P 2021 01 19.73 12.1 30.0 A a 30 2 PAP04
V C/2021 A2 2021 01 19.52 11.0 20.0 L 70 3 2 MAT08
C C/2021 A2 2021 01 19.30 12.4 30.0 C A560 2.1 MAS01
C C/2021 A2 2021 01 19.30 11.9 30.0 C A560 3 MAS01
C 405P 2021 01 19.19 16.6 20.0 L B280 1.5 LEHaa
C C/2021 A1 2021 01 19.17 18.7 25.0 T B880 0.3 MAS01
C C/2021 A1 2021 01 19.17 19.0 25.0 T B880 0.3 MAS01
C C/2010 U3 2021 01 19.08 20.0 20.0 C a120 0.5 PAP04
C C/2020 T2 2021 01 19.08 15.8 20.0 C a120 0.5 PAP04
C C/2020 V2 2021 01 18.14 17.7 50.0 C a120 0.2 PAP04
C P/2019 V2 2021 01 18.14 19.8 50.0 C a120 PAP04
C C/2020 T2 2021 01 18.07 15.9 20.0 C a120 0.6 PAP04
C C/2021 A2 2021 01 18.03 11.1 50.0 C a120 2 PAP04
C 173P 2021 01 17.99 17.2 31.5 C A020 0.4 CARah
C 178P 2021 01 17.96 18.1 31.5 C A140 0.4 CARah
C 84P 2021 01 17.95 17.1 31.5 C a780 0.6 CARah
C C/2021 A7 2021 01 17.92 16.1 50.0 C a120 0.5 PAP04
C 11P 2021 01 17.91 17.9 31.5 C a900 0.4 CARah
C 29P 2021 01 17.89 13.6 31.5 C A200 2.4 CARah


Comet Observing Planner

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Current comet magnitudes and observable region

Comet name Mag Trend Observable Visiblity
C/2020 X3 (SOHO) 9.0 fade 35N to 90S Never up Never up
C/2020 S3 (Erasmus) 9.0 fade 82N to 90S Poor elongation Poor elongation
141P/Machholz 10.5 fade 85N to 90S Evening Evening
156P/Russell-LINEAR 11.5 fade 90N to 56S Best evening Early evening
C/2019 N1 (ATLAS) 12.0 steady 31N to 90S Never up Never up
10P/Tempel 12.0 bright 71N to 90S Poor elongation Poor elongation
323P/SOHO 12.5 steady 74N to 90S Poor elongation Poor elongation
P/2016 J3 (STEREO) 12.5 bright 71N to 90S Early evening Early evening
398P/Boattini 12.5 fade 90N to 78S Best evening Best evening
C/2020 M3 (ATLAS) 12.5 fade 90N to 41S All night Never up
C/2019 Y4 (ATLAS) 13.0 fade 85N to 90S Best evening Best morning
7P/Pons-Winnecke 13.0 bright 90N to 80S Early evening Early evening
29P/Schwassmann-Wachmann 13.5 steady 90N to 66S Best evening Evening
D/1978 R1 (Haneda-Campos) 13.5 fade 90N to 72S Best morning Best morning
246P/NEAT 13.5 bright 69N to 90S Early evening Early evening
75D/Kohoutek 13.5 fade 90N to 71S Best evening Evening
C/2019 L3 (ATLAS) 13.5 steady 90N to 35S All night Never up
P/2013 PA104 (PANSTARRS) 13.5 fade 84N to 90S Best evening Best evening
88P/Howell 14.0 fade 82N to 90S Evening Early evening
C/2021 A2 (NEOWISE) 14.0 bright 51N to 90S Best morning Best morning

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.