Latest image

Periodic comet 67P/Churyumov-Gerasimenko
Image of periodic comet 67P/Churyumov-Gerasimenko, obtained on 2021 Sep. 14 (3h09-3h17UT) with 60-cm, f/3.3 Deltagraph telescope and CCD. Image is a composition 12x30 second unfiltered exposures.
Copyright © 2021 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 262000 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/2019 L3 (ATLAS) (Oct 18, 2021).

Type Comet name Obs date Mag App T Pow Dia DC Tail PA Obs
V 4P 2021 10 16.15 12.0 35.0 L 61 2.4 4 CER01
V C/2019 L3 2021 10 16.13 10.9 35.0 L 61 2.8 5/ CER01
V 29P 2021 10 16.11 10.9 35.0 L 61 4 0 CER01
V 67P 2021 10 16.09 10.3 35.0 L 61 2.1 6 CER01
C C/2019 L3 2021 10 16.02 10.3 10.0 R a962 10 0.16 307 FRIaa
C 67P 2021 10 15.99 9.6 10.0 R B526 15 0.44 269 FRIaa
C 29P 2021 10 15.95 11.0 10.0 R B406 5.4 FRIaa
C 132P 2021 10 15.91 14.1 10.0 R B406 1.7 0.8m 255 FRIaa
C C/2019 T3 2021 10 15.87 16.7 10.0 R B406 1 0.3m 99 FRIaa
C C/2017 K2 2021 10 15.81 12.8 10.0 R B856 3.6 0.05 12 FRIaa
C 29P 2021 10 15.46 10.6 43.0 Y A159 2.82 JAMaa
V 67P 2021 10 15.37 10.6 31.7 L 66 & 2 7 WIE01
V C/2019 L3 2021 10 15.37 10.5 31.7 L 66 1.5 6 WIE01
V 29P 2021 10 15.36 10.6 31.7 L 66 > 2 3 WIE01
V 4P 2021 10 15.36 12.0 31.7 L 144 & 0.7 5 WIE01
C 29P 2021 10 15.12 10.1 35.0 T a240 2.44 BUCaa
C C/2021 A1 2021 10 15.11 13.3 35.0 T a480 2 BUCaa
C 4P 2021 10 15.05 11.5 35.0 T a720 3 BUCaa
C 67P 2021 10 15.04 10.3 35.0 T a600 5.2 BUCaa
V C/2019 L3 2021 10 14.45 10.4 31.7 L 66 > 2 6 WIE01

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Comet Observing Planner

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Limiting mag:
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Current comet magnitudes and observable region

Comet name Mag Trend Observable Visiblity
45N
Visiblity
45S
342P/SOHO -1.0 steady 81N to 90S Poor elongation Poor elongation
67P/Churyumov-Gerasimenko 10.0 bright 90N to 65S Best morning Early evening
C/2019 L3 (ATLAS) 10.5 bright 90N to 48S Best morning Early evening
29P/Schwassmann-Wachmann 11.0 steady 90N to 58S Best morning Best morning
4P/Faye 11.5 steady 90N to 76S Best morning Best morning
8P/Tuttle 11.5 fade 56N to 90S Early evening Early evening
19P/Borrelly 12.0 bright 34N to 90S Never up Never up
73P-V/Schwassmann-Wachmann 12.0 bright 71N to 90S Early evening Evening
C/2021 A1 (Leonard) 12.5 bright 90N to 54S Early evening Early evening
C/2017 K2 (PANSTARRS) 12.5 bright 90N to 67S Evening Early evening
C/2020 T2 (Palomar) 13.5 fade 62N to 90S Early evening Evening
P/2013 PA104 (PANSTARRS) 13.5 fade 84N to 90S Best evening Best evening
132P/Helin-Roman-Alu 14.0 steady 87N to 90S Best evening Best morning
C/2019 T4 (ATLAS) 14.0 steady 65N to 90S Early evening Early evening
C/2021 O1 (Nishimura) 14.0 fade 86N to 90S Poor elongation Poor elongation
83D/Russell 14.0 bright 76N to 90S Early evening Early evening
6P/dArrest 14.0 fade 59N to 90S Evening Best 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

Oct. 02, 2021

New Comet P/2021 Q5 (ATLAS)

CBET 5029 & MPEC 2021-R98 , issued on 2021, September 06, announce the discovery of a new comet (magnitude ~17) on CCD images taken on August 29.6 UT with a 0.5-m f/2 Schmidt reflector at Haleakala, Hawaii, in the course of the "Asteroid Terrestrial-Impact Last Alert System" (ATLAS) search program. The new comet has been designated P/2021 Q5 (ATLAS).

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Sep. 30, 2021

New Comet C/2021 Q4 (Fuls)

CBET 5028 & MPEC 2021-Q102, issued on 2021, August 31 & September 02, announce the discovery of a new comet (magnitude ~20) on CCD images taken on August 26.2 UT with the Mt. Lemmon Survey (G96) 1.5-m reflector. The new comet has been designated C/2021 Q4 (Fuls).

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Aug. 31, 2021

New Comet C/2021 P4 (ATLAS)

With the MPEC 2021-Q42 issued on 21 August 2021, the discovery of a new Magn comet is announced. 19.4 identified by the ATLAS-HKO program (T05).

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Aug. 24, 2021

Interstellar comets like Borisov may not be all that rare

Astronomers calculate that the Oort Cloud may be home to more visiting objects than objects that belong to our solar system.

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Aug. 05, 2021

New Comet C/2021 O3 (PANSTARRS)

CBET xxxx & MPEC 2021-P05, issued on 2021, August 01, announce the discovery of a new comet (magnitude ~20) on CCD images taken on July 26.5 UT with the Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala. The new comet has been designated C/2021 O3 (PANSTARRS).

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