Latest image

Comet C/2016 R2 (PANSTARRS)
False color image of comet C/2016 R2 (PANSTARRS), obtained on 2018 Jan. 21 (20h46-20h56UT) with 60-cm, f/3.3 Deltagraph. Exposure time was 5x120s in B filter.
Copyright © 2018 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 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) (Feb 25, 2018).

Type  Comet name  Obs date       Mag     Dia   DC  Tail     Observer
  V      2015O1   2018 02 25.14  13.5     0.5  4            HAR11
  V      2016N6   2018 02 25.13  11.9     1    7   0.02 285 PIL01
  V    62         2018 02 25.10  12.3     1.3               PIL01
  V      2016R2   2018 02 22.82   9.8     3    2            COLac
  V      2017T1   2018 02 21.24   9.3     4    3            GON05
  V      2016M1   2018 02 21.23  11.0     3    2/           GON05
  C      2017O1   2018 02 21.21  14.6     2.2               RAMaa
  C      2016R2   2018 02 21.20  10.9     6.3    > 40.0m 90 RAMaa
  C      2017K6   2018 02 21.07  14.9     0.8       1.3m141 MAS01
  V      2016R2   2018 02 20.91  11.8     1.2  2            HAR11
  C   143         2018 02 19.36  17.9     0.2               MAS01
  C      2017B3   2018 02 19.23  15.6     0.3               MAS01
  C      2016T3   2018 02 19.20  18.1     0.3               MAS01
  C   217         2018 02 19.16  18.1     0.3               MAS01
  C    66         2018 02 18.35  17.6     0.4               MAS01

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)           9.5  fade    90N to 78S  Early evening  Early evening 
C/2016 R2 (PANSTARRS)       11.5  steady  90N to 60S  Best evening   Evening       
C/2016 M1 (PANSTARRS)       12.0  bright  90N to 89S  Early evening  Early evening 
C/2016 N6 (PANSTARRS)       12.5  bright  90N to 14S  All night      Never up      
C/2017 O1 (ASASSN1)         12.5  fade    90N to 14S  All night      Never up      
C/2015 O1 (PANSTARRS)       13.0  steady  90N to 52S  Best morning   Early evening 
185P/Petriew                13.0  fade    90N to 86S  Evening        Evening       
29P/Schwassmann-Wachmann    13.5  steady  82N to 90S  Poor elongation Poor elongation
P/2010 H2 (Vales)           13.5  bright  74N to 90S  Early evening  Best morning  
24P/Schaumasse              13.5  fade    78N to 90S  Early evening  Best morning  
62P/Tsuchinshan             13.5  fade    90N to 88S  Best morning   Best morning  
C/2015 V2 (Johnson)         14.0  fade    42N to 90S  Never up       Never up      
240P/NEAT                   14.0  steady  88N to 90S  Evening        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.