Latest image

Comet C/2020 F3 (NEOWISE)
Comet C/2020 F3 (NEOWISE) obtained on 2020 July 27 (21h10-21h25UT) with 300 mm, f/4.7 lens and Canon EOS 6D DSLR. Exposure time was 15x60 seconds at ISO 1600.
Copyright © 2020 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 254000 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/2020 F3 (NEOWISE) (Sep 28, 2020).

Type Comet name Obs date Mag App T Pow Dia DC Tail PA Obs
V C/2020 M3 2020 09 28.15 10.0: 25.0 C 190 & 6 1/ & 0.1 270 DECaa
V C/2020 M3 2020 09 26.76 9.4 10.0 B 25 9 3 MAT08
V C/2020 M3 2020 09 26.29 10.2 22.0 L 60 4 2/ GOI
C C/2020 P1 2020 09 25.40 10.8 7.0 A a300 2.5 MAT08
V C/2020 M3 2020 09 25.15 10.6 27.0 L 55 3 3/ DES01
V 88P 2020 09 24.94 9.2 27.0 L 55 3 5/ DES01
V C/2020 P1 2020 09 24.91 10.7 27.0 L 90 DES01
V C/2020 M3 2020 09 24.21 10.3 22.0 L 60 3 2 GOI
V C/2020 M3 2020 09 24.14 10.5 27.0 L 55 2 3/ DES01
V 88P 2020 09 23.94 9.1 27.0 L 55 3 5 DES01
V C/2020 P1 2020 09 23.91 10.6 27.0 L 90 DES01
V 88P 2020 09 23.40 9.3 25.0 L 40 6.2 4 WYA
V C/2020 P1 2020 09 23.38 10.3 25.0 L 74 3 3/ WYA
V C/2020 M3 2020 09 22.63 9.4 25.0 L 40 7.5 3/ WYA
V 88P 2020 09 22.41 9.1 25.0 L 40 6.5 4 WYA
V C/2020 F3 2020 09 22.40 10.6 25.0 L 74 3 3 WYA
V C/2020 P1 2020 09 22.39 10.7 25.0 L 74 2.5 3 WYA
V C/2018 N2 2020 09 21.87 14.7 53.1 L 155 0.5 3 HAR11
V C/2017 K2 2020 09 21.84 15.9 53.1 L 298 0.2 5 HAR11
V C/2019 U6 2020 09 21.48 13.0 40.0 L 144 1.2 2 YOS04


Comet Observing Planner

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

Current comet magnitudes and observable region

Comet name Mag Trend Observable Visiblity
141P-G/Machholz 6.0 bright 90N to 58S Early evening Early evening
88P/Howell 9.0 steady 64N to 90S Evening Best evening
141P-F/Machholz 9.5 bright 90N to 87S Evening Evening
11P/Tempel-Swift-LINEAR 9.5 bright 90N to 58S Best morning Best morning
C/2020 M3 (ATLAS) 10.0 bright 57N to 90S Early evening Best morning
C/2020 F3 (NEOWISE) 10.5 fade 78N to 90S Early evening Evening
C/2017 T2 (PANSTARRS) 11.5 fade 83N to 90S Evening Evening
141P-E/Machholz 12.0 bright 85N to 90S Evening Evening
C/2019 Y4 (ATLAS) 12.0 steady 85N to 90S Early evening Early evening
C/2020 P1 (NEOWISE) 12.5 bright 45N to 90S Never up Never up
C/2008 Y12 (SOHO) 12.5 bright 56N to 90S Best morning Best morning
C/2019 N1 (ATLAS) 13.0 bright 90N to 79S Poor elongation Poor elongation
C/2020 Q1 (Borisov) 13.0 fade 90N to 25S All night Never up
162P/Siding Spring 13.5 bright 30N to 90S Never up Never up
C/2019 U6 (Lemmon) 13.5 fade 90N to 67S Evening Evening
29P/Schwassmann-Wachmann 13.5 steady 90N to 62S Best morning Best morning
C/2020 F8 (SWAN) 14.0 fade 90N to 85S Best morning Early 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.

Top news

Sep. 22, 2020

QHYCCD Camera type keys

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


Latest news

Sep. 21, 2020

Comet discovered to have its own northern lights

Comet 67P/Churyumov-Gerasimenko has its own far-ultraviolet aurora, data reveal. It is the first time such electromagnetic emissions in the far-ultraviolet have been documented on a celestial object other than a planet or moon.


Sep. 21, 2020

New Comet C/2020 S3 (Erasmus)

CBET 4885 & MPEC 2020-S119, issued on 2020, September 20, announce the discovery of a comet (magnitude ~18.5) by Nicolas Erasmus (South African Astronomical Observatory), in four 30-s CCD images taken in 5" seeing on Sept. 17.6 UT with a 0.5-m f/2 Schmidt reflector at Mauna Loa, Hawaii, in the course of the "Asteroid Terrestrial-Impact Last Alert System" (ATLAS) search program. The new comet has been designated C/2020 S3 (Erasmus).


Sep. 07, 2020

Rainbow comet with a heart of sponge

A permeable heart with a hardened facade –the resting place of Rosetta’s lander on comet 67P/Churyumov-Gerasimenko is revealing more about the interior of the 'rubber duck' shaped-body looping around the Sun.


Aug. 22, 2020

Hubble snaps close-up of celebrity comet NEOWISE

Whether it’s a surprise asteroid, colorful aurora or a heart-stopping eclipse, the landscape of the night sky is constantly changing. When a new visitor appears in view, it’s guaranteed to grab the attention of professional astronomers and casual sky gazers alike. Well, consider the Hubble Space Telescope the paparazzi of the sky, as it’s managed to snap the closest images yet of the sky’s latest visitor to make headlines, comet C/2020 F3 (NEOWISE), after it passed by the Sun. Comet NEOWISE is considered the brightest comet visible from the Northern Hemisphere since 1997’s Hale-Bopp. It’s estimated to be traveling at a whopping 40 miles per second, or 144,000 miles per hour. The comet’s closest approach to the Sun took place on July 3 and it’s now heading back to the outer parts of the solar system, not to pass through again for another 7,000 years or so.


Aug. 03, 2020

New Comet C/2020 O2 (Amaral)

CBET 4822 & MPEC 2020-P10, issued on 2020, August 02, announce the discovery of a comet (magnitude ~18) by Leonardo S. Amaral (Rio de Janeiro, Brazil) on three 60-s CCD exposures taken on July 23 with a 0.3-m f/4 reflector. The new comet has been designated C/2020 O2 (Amaral).