Latest image

Comet C/2018 W2 (Africano)
False color unfiltered image of comet C/2018 W2 (Africano), obtained on 2019 Jul. 30 (1h28-1h48UT) with 60-cm, f/3.3 Deltagraph telescope. Exposure time was 10x120 seconds. Copyright © 2019 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 241000 comet observations of more than 1200 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/2018 W2 (Africano) (Aug 20, 2019).

Type Comet name Obs date Mag App T Pow Dia DC Tail PA Obs
V C/2018 W2 2019 08 16.76 11.1 40.0 L 144 1.8 2/ YOS04
V C/2018 N2 2019 08 16.74 12.3 40.0 L 144 0.7 4/ YOS04
C C/2017 T2 2019 08 13.45 13.7 10.6 R a180 1.1 1.1m 230 RAMaa
C 95P 2019 08 13.23 17.9 50.0 L a220 0.2 HILaa
C C/2018 W2 2019 08 13.12 11.1 50.0 L a150 2.2 HILaa
C C/2018 N2 2019 08 13.09 11.6 50.0 L a150 1.1 HILaa
C 29P 2019 08 13.08 12.4 50.0 L a150 2.3 HILaa
C C/2018 W2 2019 08 12.45 10.9 10.6 R a720 11 LEHaa
C 261P 2019 08 12.11 15.1 50.0 L a150 0.5 HILaa
C 260P 2019 08 12.07 12.1 50.0 L a 90 0.8 HILaa
V C/2017 T2 2019 08 12.03 13.5: 32.6 L 182 0.8 4 GUZ
C 29P 2019 08 12.03 12.1 50.0 L a150 1.7 HILaa
V C/2018 N2 2019 08 12.02 12.3 32.6 L 114 1.5 5 GUZ
V 260P 2019 08 12.01 12.7 32.6 L 114 1.2 5 GUZ
V 29P 2019 08 12.00 13.4 32.6 L 114 1 2/ GUZ
V C/2018 W2 2019 08 11.99 11.5 32.6 L 67 2.5 4 GUZ
C C/2017 T2 2019 08 11.99 18.4 23.5 T a 60 < 1 4 < 1.0m 0 BAHab
C C/2018 W2 2019 08 11.97 14.6 23.5 T a 30 < 1 S7 < 1.0m 0 BAHab
C C/2018 W2 2019 08 11.44 11.0 10.6 R a180 7.9 RAMaa
C P/2014 U2 2019 08 11.23 18.7 50.0 L a150 0.2 HILaa


Comet Observing Planner

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Current comet magnitudes and observable region

Comet name Mag Trend Observable Visiblity
85P/Boethin 7.5 bright 90N to 72S Best morning Early evening
P/2008 Y12 (SOHO) 9.5 bright 58N to 90S Evening Best evening
C/2018 W2 (Africano) 10.5 bright 90N to 33S All night Never up
260P/McNaught 12.5 bright 90N to 75S Best morning Best morning
C/2008 Y12 (SOHO) 12.5 bright 56N to 90S Best morning Best morning
C/2017 T2 (PANSTARRS) 12.5 bright 90N to 69S Best morning Early evening
C/2018 N2 (ASASSN) 12.5 bright 90N to 69S Best morning Early evening
289P/Blanpain 12.5 bright 75N to 90S Best morning Best morning
68P/Klemola 13.0 bright 82N to 90S Best evening Best evening
29P/Schwassmann-Wachmann 13.0 steady 90N to 74S Best morning Best morning
C/2018 R3 (Lemmon) 13.5 fade 90N to 72S Poor elongation Poor elongation
C/2017 M4 (ATLAS) 14.0 fade 47N to 90S Early evening Best evening
C/2016 M1 (PANSTARRS) 14.0 fade 61N to 90S Early evening Early evening
C/2018 A6 (Gibbs) 14.0 steady 26N to 90S Never up Never up

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

Aug. 14, 2019

An Unexpected Companion

Last week marked five years since ESA’s Rosetta probe arrived at its target, a comet named 67P/Churyumov-Gerasimenko (or 67P/C-G). Tomorrow, 13 August, it will be four years since the comet, escorted by Rosetta, reached its perihelion – the closest point to the Sun along its orbit.


Jul. 02, 2019

'Oumuamua is not an alien spacecraft. New analysis suggests a natural origin for our first interstellar visitor.

Early reports of the interstellar visitor 'Oumuamua's odd characteristics led some to speculate that the object could be an alien spacecraft, sent from a distant civilization to examine our star system. But a new analysis by an international team of 14 astronomers strongly suggests that 'Oumuamua has a purely natural origin.


Jun. 22, 2019

ESA to Launch Comet Interceptor Mission in 2028

With Comet Interceptor, ESA plans to meet a comet on its first trip into the inner solar system. The mission was selected Wednesday after a fast-track proposal process and will be developed on a rapid (for ESA) timeline, with a launch planned for 2028. Congratulations to the Comet Interceptor team on their selection!


Jun. 20, 2019

ESA's new mission to intercept a Comet

'Comet Interceptor' has been selected as ESA's new fast-class mission in its Cosmic Vision Programme. Comprising three spacecraft, it will be the first to visit a truly pristine comet or other interstellar object that is only just starting its journey into the inner Solar System.


May. 30, 2019

Comet inspires chemistry for making breathable oxygen on Mars

Researchers have demonstrated a new reaction for generating oxygen that could help humans explore the universe and perhaps even fight climate change at home.