Comet C/2011 KP36 (Spacewatch)
False color image of comet C/2011 KP36 (Spacewatch), obtained on 2016 Jun. 29 (1h13-1h32UT) with 60-cm, f/3.3 Deltagraph. Exposure time 5x120s. Copyright © 2016 by H. Mikuz, Crni Vrh Observatory.

Welcome to COBS!

Comet Observation database (COBS) was developed in 2010 and is maintained by Crni Vrh Observatory. It is a unique service offering comet observers to submit, display and analyse comet data in a single location and is opened to comet observers worldwide. Registered observers may submit the observations using a simple web-based form which will store their observations into an SQL database and display them in ICQ format.

Data stored in COBS database is freely available to everyone with respect to our data usage policy, and can be analysed with COBS online tools or exported and further used in other analysis software and publications.

Database currently contains more than 226000 comet observations of more than 1200 different comets and represents the largest available database of comet observations.

Amateur comet observers can make a useful contribution to science by observing comets and submitting their observations to the COBS, as the professional astronomers do not have the time nor the telescopes needed to gather such data. We encourage comet observers worldwide to submit their observations and contribute to the COBS database.

Light-curve of Comet C/2015 V2 (Johnson) (Dec 05, 2016).

Recent observations

Type  Comet name  Obs date       Mag     Dia   DC  Tail     Observer
  C    56         2016 12 07.30  15.1     0.4       1.0m225 RAMaa
  C      2013US10 2016 12 07.30  15.3     0.6               RAMaa
  C   226         2016 12 07.29  15.2     0.6               RAMaa
  V      2016U1   2016 12 06.19  10.5     4    1            BUIaa
  V      2015V2   2016 12 06.03  12.7     0.8  4            NOV01
  V      2016U1   2016 12 06.02  11.0:    4    1            NOV01
  C      2016U1   2016 12 06.00  10.9     6    1/           NOV01
  C      2015V2   2016 12 05.96  13.0     1    4/   1.2m316 NOV01
  C      2016U1   2016 12 05.50  11.7   > 3.6               RAMaa
  C      2011KP36 2016 12 05.21  14.1     1.4               RAMaa
  V      2015V2   2016 12 05.18  12.0     1.5  3/           MEY  
  V      2016U1   2016 12 05.17  10.4     4    1/           MEY  
  V      2016U1   2016 12 04.49  10.5     3    1            HER02
  V    45         2016 12 04.43  11.1     1.5  3            WYA  
  V      2015V2   2016 12 03.21  12.2     1    4   0.02     KUT  


Comet Observing Planner

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Current comet magnitudes (December 6)

Comet                     Magnitude   Trend    Observable     When visible
PanSTARRS (2015 ER61)         10.5    bright   45 N to 30 S   early morning
Johnson (2015 V2)             10.5    bright   90 N to  5 S   morning
45P/Honda-Mrkos-Pajdusakova   11      bright   20 N to 30 S   early evening
NEOWISE (2016 U1)             11.5    bright   90 N to  5 N   morning
144P/Kushida                  12      fade     60 N to 35 S   morning
237P/LINEAR                   12      fade     Poor elongation
43P/Wolf-Harrington           12.5    fade     45 N to 45 S   early morning
2P/Encke                      13 ?    bright   65 N to 40 S   evening
29P/Schwassmann-Wachmann      13 ?    varies   10 N to 20 S   early evening
Spacewatch (2011 KP36)        13      fade     55 N to 50 S   evening
81P/Wild                      13.5    fade     In conjunction
PanSTARRS (2013 X1)           13.5    fade     Poor elongation
41P/Tuttle-Giacobinni-Kresak [14 ?    bright   50 N to 35 S   morning

List of comets maintained by Jonathan Shanklin at

Latest news

Dec. 05, 2016

Relationships between chemicals found on comets

A new study has revealed similarities and relationships between certain types of chemicals found on 30 different comets, which vary widely in their overall composition compared to one another. The research is part of ongoing investigations into these primordial bodies, which contain material largely unchanged from the birth of the solar system some 4.6 billion years ago.


Nov. 12, 2016

Comet Chury is much younger than previously thought

Based on computer simulations, Astrophysicists at the University of Bern, Switzerland, conclude that the comet Chury did not obtain its duck-like form during the formation of our solar system 4.5 billion years ago. Although it does contain primordial material, they are able to show that the comet in its present form is hardly more than a billion years old.


Oct. 19, 2016

Astronomers predict possible birthplace of Rosetta-probed comet 67P

When the Rosetta spacecraft successfully touched down on comet 67P/Churyumov-Gerasimenko on September 30, 2016, the news was shared globally via Twitter in dozens of languages. Citizens the world over were engaged by the astronomical achievement, and now experts are eager to learn as much as possible about the critically important celestial body of ice.


Oct. 18, 2016

Klim Churyumov (1937-2016)

We were saddened to learn the news yesterday that Klim Churyumov, who discovered Rosetta's comet together with Svetlana Gerasimenko in 1969, has passed away.


Oct. 16, 2016

A note to CCD observers - kphot review

It’s been several years that a new method of processing CCD observations was announced by german astronomer Uwe Pilz. The method was a promising way for amateur astronomers, to generate a visual equivalent magnitude using a CCD measures with a very simple way of processing. Now after several years, there were several observers which were using this method, one of most active was Kevin Hills from United Kingdom. The huge amount of his observations made possible a deep comparative analysis of this method with visual and classic CCD magnitudes.