Latest image

Comet C/2016 R2 (PanSTARRS)
True color image of comet C/2016 R2 (PanSTARRS), obtained on 2017 Jan. 05 with 10" f/3.9 Astrograph. Exposure time was 60m in BRGB filters.
Copyright © 2018 by C. Schur, Payson, Arizona

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 232000 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/2016 R2 (PANSTARRS) (Jan 19, 2018).

Type  Comet name  Obs date       Mag     Dia   DC  Tail     Observer
  V      2016R2   2018 01 18.95  10.6     3.4  2/           COLac
  V      2017T1   2018 01 18.94  10.1     3.1  1            COLac
  C      2016M1   2018 01 18.54  13.4:    0.9               RAMaa
  C      2017T1   2018 01 18.09   9.8     9.1       9.8m 57 RAMaa
  V      2017T1   2018 01 17.80  10.1     2.5  2/           MEY  
  V      2016R2   2018 01 17.79  11.0     1.6  3            MEY  
  V    24         2018 01 17.69  12.7     1.4  2/           WYA  
  V    62         2018 01 17.68  12.5     3.3  2            WYA  
  V      2017K6   2018 01 17.46  13.8     1    3            WYA  
  V      2016R2   2018 01 17.45  11.4     4    4            WYA  
  V      2015V2   2018 01 17.44  12.9     1.4  3            WYA  
  C      2017T1   2018 01 17.09   9.6     9.9      10.1m 52 RAMaa
  C      2016R2   2018 01 17.02  11.0     6         2.5m108 BAMaa
  V      2017T1   2018 01 16.78  10.4     4    2            MEY  
  V      2017K6   2018 01 16.46  13.8     1    3            WYA  

Comet Observing Planner

Start session:
Session length:
Limiting mag:
Min altitude:
Min Solar Elongation:
Min Lunar Elongation:

Current comet magnitudes and observable region

Comet                       Mag   Trend   Observable        When visible
                                                         45N            45S
C/2017 T1 (Heinze)          10.4  fade    90N to 50S  Best evening   Early evening 
C/2016 R2 (PANSTARRS)       10.8  bright  90N to 70S  Best evening   Best evening  
62P/Tsuchinshan             11.6  fade    90N to 88S  Best morning   Early evening 
C/2017 O1 (ASASSN1)         11.7  fade    90N to 6S   All night      Never up      
24P/Schaumasse              12.9  fade    82N to 90S  Early evening  Early evening 
C/2016 N6 (PANSTARRS)       13.2  bright  90N to 31S  All night      Never up      
29P/Schwassmann-Wachmann    13.3  steady  80N to 90S  Evening        Early evening 
C/2016 M1 (PANSTARRS)       13.4  bright  90N to 84S  Early evening  Early evening 
C/2015 O1 (PANSTARRS)       13.4  bright  90N to 63S  Early evening  Early evening 
C/2015 V2 (Johnson)         13.4  fade    38N to 90S  Never up       Never up      
P/2010 H2 (Vales)           13.7  steady  76N to 90S  Early evening  Early evening 
C/2017 K6 (Jacques)         13.9  fade    59N to 90S  Evening        Best evening  

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

Jan. 15, 2018

Rosetta and Planck honoured in annual Royal Astronomical Society awards

ESA’s Matt Taylor has been awarded the 2018 Service Award for Geophysics by the Royal Astronomical Society for his outstanding contribution to the Rosetta mission, while the Planck mission has been honoured with the Group Achievement Award for their extraordinary achievements in cosmology.


Jan. 11, 2018

NASA's newly renamed Swift Mission spies a comet slowdown

NASA's Swift spacecraft, now renamed the Neil Gehrels Swift Observatory after the mission's late principal investigator, has detected the most dramatic change in a comet's rotation ever seen.


Jan. 08, 2018

Arecibo Radar Returns with Asteroid Phaethon Images

After several months of downtime since Hurricane Maria struck the island of Puerto Rico, the Arecibo Observatory Planetary Radar has returned to normal operation, providing the highest-resolution images to date of near-Earth asteroid 3200 Phaethon during its December 2017 close approach to Earth.


Jan. 08, 2018

NASA Invests in Concept Development for Missions to Comet, Saturn Moon Titan

NASA has selected two finalist concepts for a robotic mission planned to launch in the mid-2020s: a comet sample return mission and a drone-like rotorcraft that would explore potential landing sites on Saturn’s largest moon, Titan.


Dec. 20, 2017

Alien object 'Oumuama was a natural body visiting from another solar system

Scientists have investigated a mysterious object that passed close to Earth after arriving from deep interstellar space.