Comet C/2015 V2 (Johnson)
Color image of comet C/2015 V2 (Johnson), obtained on 2016 Dec. 30 (4h38-4h54UT) with 60-cm, f/3.3 Deltagraph. Exposure time 3x60s 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 228000 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 45P (Feb 10, 2017).

Recent observations

Type  Comet name  Obs date       Mag     Dia   DC  Tail     Observer
  V    41         2017 02 25.80  10.7     2.8  3            BOH02
  C    41         2017 02 25.23  10.1     8.2               RAMaa
  C      2016VZ18 2017 02 25.15  14.3     1.2               RAMaa
  V      2015V2   2017 02 25.00   9.7     4    5            GUZ  
  V      2015V2   2017 02 24.99  10.3     2    6   0.15 300 GUZ  
  V    45         2017 02 24.98   8.4   &15    2   0.5  250 GUZ  
  V    41         2017 02 24.97  10.2     6    3            GUZ  
  V    41         2017 02 24.96   9.8    10    3            GUZ  
  V      2015V2   2017 02 24.94 [10.3   ! 2                 BIEaa
  V    45         2017 02 24.93  10.0:  & 5    1            MEY  
  V    45         2017 02 24.93 [10.2   ! 5                 BIEaa
  V    41         2017 02 24.91  10.9     2.5  3            MEY  
  V      2015V2   2017 02 24.90  10.8     0.9  4    3.0m335 HAR11
  V    45         2017 02 24.89   9.0     5.5  1   15.0m290 HAR11
  V    41         2017 02 24.81  11.1     2.6  3            HAR11


Comet Observing Planner

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Current comet magnitudes (February 19)

Comet                     Magnitude   Trend    Observable     When visible
45P/Honda-Mrkos-Pajdusakova    7.5    fade     90 N to 45 S   best morning
PanSTARRS (2015 ER61)         10      bright   50 N to 60 S   early morning
2P/Encke                      10      bright   75 N to 10 S   evening
Johnson (2015 V2)             10.5    bright   90 N to 25 S   best morning
NEOWISE (2016 U1)             11      fade     Poor elongation
41P/Tuttle-Giacobinni-Kresak  12      bright   75 N to 50 S   best morning
73P/Schwassmann-Wachmann      12.5    bright   30 N to 40 S   early morning
PanSTARRS (2016 R2)           13 ?    bright   25 N to 55 S   evening
29P/Schwassmann-Wachmann      13 ?    varies   In conjunction
315P/LONEOS                   13.5    steady   70 N to 10 S   morning
237P/LINEAR                   13.5    fade     In conjunction
Spacewatch (2011 KP36)        13.5    fade     40 N to 20 S   early evening
43P/Wolf-Harrington           14      fade     25 N to 60 S   morning

List of comets maintained by Jonathan Shanklin at

Latest news

Feb. 12, 2017

Bright outburst of Comet 73P fragment

Thierry Noel has reported that Comet 73P/Schwassmann-Wachmann is showing a second component in images taken remotely from Chile (Observers: A. Maury, B. Sandness, T. Noel). Follow-up images taken by Andre Debackere using the Las Cumbres Observatory 1.0-m telescope at Siding Spring, Australia and measured by Richard Miles show that the main comet is accompanied by a much brighter secondary component surrounded by a faint coma.


Feb. 10, 2017

Massive comet-like object pollutes atmosphere of a white dwarf

For the first time, scientists using NASA's Hubble Space Telescope have witnessed a massive object with the makeup of a comet being ripped apart and scattered in the atmosphere of a white dwarf, the burned-out remains of a compact star. The object has a chemical composition similar to Halley's Comet, but it is 100,000 times more massive and has a much higher amount of water. It is also rich in the elements essential for life, including nitrogen, carbon, oxygen, and sulfur.


Jan. 30, 2017

Micro spacecraft investigates cometary water mystery

In September 2015, a team of astronomers successfully observed the entire hydrogen coma of the comet 67P/Churyumov-Gerasimenko, using the LAICA telescope onboard the PROCYON spacecraft. They also succeeded in obtaining the absolute rate of water discharge from the comet. Through our observations, we were able to test the coma models for the comet for the first time. This result is the first scientific achievement by a micro spacecraft for deep space exploration.


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.