Latest image

Comet C/2017 T2 (PANSTARRS)
Comet C/2017 T2 (PANSTARRS) obtained on 2020 Jan. 29 (20h50-21h21UT), with 19-cm, f/4 Flat Field Camera and Canon EOS 700D. Exposure time was 15x120 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 247000 comet observations of more than 1300 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/2017 T2 (PANSTARRS) (Feb 18, 2020).

Type Comet name Obs date Mag App T Pow Dia DC Tail PA Obs
V C/2017 T2 2020 02 17.77 9.2 25.4 L 64 3 4 MEY
C C/2019 Y4 2020 02 17.07 14.9 25.0 T A680 1 0.8m 220 MAS01
C C/2019 Y4 2020 02 17.07 15.0 25.0 T A680 1.2 MAS01
C C/2019 Y1 2020 02 16.85 12.0 25.0 T a840 1.9 1.8m 68 MAS01
C C/2019 Y1 2020 02 16.85 10.8 25.0 T a960 3.5 MAS01
C C/2019 Y4 2020 02 16.30 14.9 43.1 Y a360 0.4 BUIaa
C C/2020 A2 2020 02 16.23 12.6 50.0 L a150 3.8 HILaa
C C/2019 N1 2020 02 16.21 15.8 50.0 L a180 0.4 HILaa
C 155P 2020 02 16.07 15.0 50.0 L a150 0.7 HILaa
C 124P 2020 02 16.06 15.9 50.0 L a150 0.3 HILaa
C 117P 2020 02 16.05 17.9 50.0 L a150 0.3 HILaa
C 159P 2020 02 16.02 18.3 50.0 L a240 0.3 HILaa
C 228P 2020 02 16.01 18.4 50.0 L a150 0.2 HILaa
V C/2020 A2 2020 02 15.99 10.8 10.0 B 25 3 2 GUZ
C 76P 2020 02 15.99 18.5 50.0 L a150 0.2 HILaa
C 78P 2020 02 15.98 15.2 50.0 L a150 0.5 HILaa
C 266P 2020 02 15.89 18.1 50.0 L a150 0.3 HILaa
C 78P 2020 02 15.87 16.1 10.0 R A323 0.7 FRIaa
C A/2019 U6 2020 02 15.87 14.9 50.0 L a150 0.6 HILaa
C 174P 2020 02 15.85 19.3 50.0 L a360 0.2 HILaa


Comet Observing Planner

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Current comet magnitudes and observable region

Comet name Mag Trend Observable Visiblity
C/2017 T2 (PANSTARRS) 9.0 bright 90N to 30S All night Never up
C/2019 Y1 (ATLAS) 10.0 bright 90N to 82S Evening Early evening
C/2020 A2 (Iwamoto) 11.5 fade 90N to 31S All night Never up
C/2008 Y12 (SOHO) 12.5 bright 56N to 90S Best morning Best morning
C/2018 N2 (ASASSN) 13.0 fade 90N to 45S Best evening Early evening
58P/Jackson-Neujmin 13.5 bright 78N to 90S Early evening Early evening
155P/Shoemaker 14.0 fade 90N to 75S 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

Feb. 07, 2020

New Comet C/2020 B3 (Rankin)

MPEC 2020-C111, issued on 2020, February 06, announces the discovery of a comet (magnitude ~20) by D. Rankin in the course of the Mt. Lemmon Survey (G96), in images taken on 2020, Jan 29 with a 1.5-m reflector + 10K CCD. The new comet has been designated C/2020 B3 (Rankin).


Feb. 06, 2020

Rosetta and the Chameleon Comet

A grand synthesis of Rosetta data has shown how its target comet repeatedly changed colour dur-ing the two years it was watched by the spacecraft. The chameleon comet's nucleus became progres-sively less red as it made its close pass around the Sun, and then red again as it returned to deep space.


Feb. 06, 2020

ESA starts definition phase for Comet Interceptor

Following an internal assessment of the results of the phase 0 studies, the European Space Agency is moving forward starting the Definition Phase (phase A) for the F-class mission Comet Interceptor.


Jan. 22, 2020

The salt of the comet

Researchers have found an explanation for why very little nitrogen could previously be accounted for in the nebulous covering of comets: the building block for life predominantly occurs in the form of ammonium salts, the occurrence of which could not previously be measured. The salts may be a further indication that comet impacts may have made life on Earth possible in the first place.


Jan. 21, 2020

Building blocks of life spotted on Rosetta's Comet hint at composition of its birthplace

Observations from ESA's Rosetta spacecraft are shedding light on the mysterious make-up of Comet 67P/Churyumov-Gerasimenko, revealing a mix of compounds thought to be essential precursors to life – including salts of ammonium and a particular type of hydrocarbons. These new studies suggest the comet gleaned this mate-rial from the presolar cloud where the Solar System formed 4.6 billion years ago.