Comet C/2016 U1 (NEOWISE)
True color image of comet C/2016 U1 (NEOWISE), obtained on 2016 Dec. 10 (3h53-4h37UT) with 60-cm, f/3.3 Deltagraph. Exposure time 12x30s in each filter. 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 227000 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) (Jan 03, 2017).

Recent observations

Type  Comet name  Obs date       Mag     Dia   DC  Tail     Observer
  C      2016R2   2017 01 19.48  14.1                       BUIaa
  C      2015V2   2017 01 19.11  12.3                       BUCaa
  C      2015V2   2017 01 18.05  12.4                       BUCaa
  C      2015V2   2017 01 18.05  12.4                       BUCaa
  V     2         2017 01 16.76  12.5:    2.1  1            HAR11
  V     2         2017 01 15.76  13.0:    1.2  0            HAR11
  C     2         2017 01 10.74  11.8     9                 LEHaa
  C    73         2017 01 10.24  14.1     0.5               HILaa
  C    45         2017 01 09.81   6.5     4.1               HILaa
  V    45         2017 01 09.77   6.2     5    3            NAV02
  C    41         2017 01 09.71  15.4     1.9               LEHaa
  C      2015V2   2017 01 09.52  11.4     9        0.16 321 LEHaa
  C      2015ER61 2017 01 09.28  11.6     0.9               HILaa
  C   144         2017 01 09.15  14.0     0.2               HILaa
  C    43         2017 01 09.11  12.6     0.4               HILaa


Comet Observing Planner

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Current comet magnitudes (January 1)

Comet                     Magnitude   Trend    Observable     When visible
45P/Honda-Mrkos-Pajdusakova    7      steady   40 N to 10 S   early evening
NEOWISE (2016 U1)              7.5    bright   Poor elongation
Johnson (2015 V2)             10.5    bright   90 N to 15 S   morning
PanSTARRS (2015 ER61)         10.5    bright   50 N to 50 S   early morning
73P/Schwassmann-Wachmann      11.5    bright   50 N to 35 S   early morning
2P/Encke                      12      bright   65 N to 25 S   evening
144P/Kushida                  12.5    fade     50 N to 45 S   early morning
PanSTARRS (2016 R2)           13 ?    bright   20 N to 50 S   best evening
29P/Schwassmann-Wachmann      13 ?    varies   Poor elongation
237P/LINEAR                   13      fade     Poor elongation
43P/Wolf-Harrington           13      fade     35 N to 50 S   morning
Spacewatch (2011 KP36)        13      fade     55 N to 45 S   evening
PanSTARRS (2013 X1)           14      fade     10 N to 40 S   early morning
41P/Tuttle-Giacobinni-Kresak [14 ?    bright   65 N to 50 S   best morning

List of comets maintained by Jonathan Shanklin at

Latest news

Jan. 12, 2017

New Comet: C/2017 A3 (Elenin)

CBET nr. 4344, issued on 2017, January 11, announces the discovery of a comet (magnitude ~18.2) by L. Elenin on three CCD images obtained with 0.4-m f/2.4 reflector + CCD at the ISON-SSO Observatory at Siding Spring on Jan. 5.4 UT. The new comet has been designated C/2017 A3 (Elenin).


Jan. 09, 2017

Hubble detects 'exocomets' taking the plunge into a young star

Interstellar forecast for a nearby star: Raining comets! NASA's Hubble Space Telescope has discovered comets plunging onto the star HD 172555, which is a youthful 23 million years old and resides 95 light-years from Earth.


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.