Latest image

Comet C/2019 Y4 (ATLAS)
Comet C/2019 Y4 (ATLAS) obtained on 2020 Mar. 23 (21h53-22h23UT) with 19-cm, f/4 Flat Field Camera and Canon EOS 6D DSLR. Exposure time was 15x120 seconds at ISO 1600. FOV is 1.7° x 1.1°.
Copyright © 2020 by H. Mikuz, Črni Vrh Observatory.tory.

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 248000 comet observations of more than 1300 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/2017 T2 (PANSTARRS) (Apr 05, 2020).

Type Comet name Obs date Mag App T Pow Dia DC Tail PA Obs
V C/2019 Y1 2020 04 05.13 8.6 25.4 T 96 3.4 4 COLac
V C/2019 Y1 2020 04 05.13 8.7 28.0 T 112 3 3 CSO
V C/2019 Y4 2020 04 05.10 9.2: 25.4 T 96 2.5 4/ COLac
V C/2019 Y4 2020 04 04.97 8.8 10.0 B 25 5 4 SCI
V C/2017 T2 2020 04 04.86 8.6 25.4 T 96 2.9 4/ COLac
C C/2019 Y1 2020 04 04.85 8.0 40.0 Y a180 4.89 KIIaa
C C/2019 Y4 2020 04 04.84 8.5 40.0 Y a180 6.2 KIIaa
C C/2017 T2 2020 04 04.84 8.2 40.0 Y a180 6.2 KIIaa
V C/2017 T2 2020 04 04.83 9.9 28.0 T 112 2.5 2 CSO
V C/2019 Y4 2020 04 04.82 9.0 28.0 T 112 2.5 2 CSO
V C/2017 T2 2020 04 04.82 8.5: 10.0 B 25 & 3 3/ SCI
V C/2019 Y1 2020 04 04.78 7.4 10.0 B 25 & 5 4 SCI
C C/2019 Y4 2020 04 03.90 8.7 9.0 R B129 9.4 JAMaa
V C/2017 T2 2020 04 03.89 9.6: 25.4 T 96 3 4 COLac
C C/2019 Y4 2020 04 03.22 8.4 10.6 R a720 19.8 HER02
C C/2019 Y4 2020 04 03.22 9.6 10.6 R a720 8.2 HER02
V C/2019 Y4 2020 04 03.14 [9.5 15.0 T 36 AGUaa
V C/2019 Y1 2020 04 03.11 8.5 5.0 B 10 3 7 GUZ
V C/2017 T2 2020 04 03.10 8.5 5.0 B 10 5 4 GUZ
V C/2019 Y4 2020 04 03.09 8.2 5.0 B 19 8 4 GUZ

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Comet Observing Planner

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

Current comet magnitudes and observable region

Comet name Mag Trend Observable Visiblity
45N
Visiblity
45S
C/2019 Y4 (ATLAS) 8.0 bright 90N to 22S All night Never up
C/2017 T2 (PANSTARRS) 8.5 bright 90N to 20S All night Never up
C/2019 Y1 (ATLAS) 8.5 bright 90N to 37S All night Never up
210P/Christensen 11.5 bright 90N to 78S Poor elongation Poor elongation
58P/Jackson-Neujmin 12.5 bright 86N to 90S Early evening Early evening
C/2008 Y12 (SOHO) 12.5 bright 56N to 90S Best morning Best morning
C/2018 N2 (ASASSN) 13.5 fade 90N to 35S All night Never up
C/2020 A2 (Iwamoto) 14.0 fade 90N to 43S All night Never up
29P/Schwassmann-Wachmann 14.0 steady 90N to 72S Poor elongation Poor elongation

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

Apr. 04, 2020

Moravian Instruments Camera type keys

In order to unify the camera type abbreviation keys of all Moravian instrument models, we had to change some of the currently used camera type keys.

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Apr. 04, 2020

New Comet C/2020 F3 (NEOWISE)

CBET 4740 & MPEC 2020-G05, issued on 2020, April 01, announce the discovery of a comet (magnitude ~17) in infrared images obtained with the Near-Earth Object Wide-field Infrared Survey Explorer (or NEOWISE; formerly the WISE earth-orbitingsatellite; cf. CBET 4225). The new comet has been designated C/2020 F3 (NEOWISE).

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Apr. 03, 2020

New Comet C/2020 F2 (ATLAS)

CBET 4739 & MPEC 2020-G04, issued on 2020, April 01, announce the discovery of a comet by R. Wainscoat on CCD images obtained on Mar. 22.6 UT with the Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala, which he then noticed (via posting at the Minor Planet Center's NEOCP webpage) was apparently identical with an apparently asteroidal object (magnitude ~19) discovered on CCD images taken the previous night with a 0.5-m f/2 Schmidt reflector at Haleakala, Hawaii, in the course of the "Asteroid Terrestrial-Impact Last Alert System" (ATLAS) search program. The new comet has been designated C/2020 F2 (ATLAS).

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Mar. 14, 2020

Ammonium salts found on Rosetta’s comet

Scientists have detected ammonium salts on the surface of Comet 67P/Churyumov-Gerasimenko (shown in this image bellow) by analysing data collected by the Visible, Infrared and Thermal Imaging Spectrometer (VIRTIS) on ESA’s Rosetta mission between August 2014 and May 2015.

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Feb. 07, 2020

New Comet C/2020 B3 (Rankin)

MPEC 2020-C111, issued on 2020, February 06, announces the discovery of a comet (magnitude ~20) by D. Rankin in the course of the Mt. Lemmon Survey (G96), in images taken on 2020, Jan 29 with a 1.5-m reflector + 10K CCD. The new comet has been designated C/2020 B3 (Rankin).

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