Latest image

Comet C/2020 F3 (NEOWISE)
Comet C/2020 F3 (NEOWISE) obtained on 2020 July 20 (20h44-20h56UT), from Zbišina, Island Cres, Croatia with 120 mm, f/4 lens and Canon EOS 6D DSLR. Exposure time was 15x45 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 253000 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) (Aug 03, 2020).

Type Comet name Obs date Mag App T Pow Dia DC Tail PA Obs
V C/2020 F3 2020 08 02.97 6.1: 8.0 B 20 & 3 4 MORai
V C/2020 F3 2020 08 02.94 5.6 5.0 B 7 5 4/ GOI
V C/2020 F3 2020 08 02.93 5.7 10.0 B 20 4 6/ 1.0 90 GOI
V 2P 2020 08 02.92 9.6 10.0 B 25 DES01
V C/2019 U6 2020 08 02.91 9.5 10.0 B 25 DES01
V C/2020 F3 2020 08 02.90 5.4 10.0 B 25 5 4 > 1.0 DES01
V C/2020 F3 2020 08 02.89 5.6 4.4 B 8 8 5 HAR11
C C/2020 F3 2020 08 02.89 5.5 10.0 R a250 23.3 1.7 77 DEK01
V C/2020 F3 2020 08 02.81 5.4 5.0 B 12 4 5 PAP04
V C/2020 F3 2020 08 02.35 5.1 7.0 B 15 6.5 5/ 30.0m 84 WYA
C 29P 2020 08 02.07 12.7 20.0 Y a300 0.63 BUIaa
V C/2020 F3 2020 08 01.95 5.5 5.0 B 7 4 5 GOI
C C/2018 N2 2020 08 01.94 14.1 20.0 Y A080 0.4 BUIaa
V C/2020 F3 2020 08 01.93 5.1 5.6 B 8 & 8 7 SCH04
V C/2017 T2 2020 08 01.93 10.7 20.0 T 94 2 3.0 LAB02
V C/2020 F3 2020 08 01.92 5.7 0.0 E 6 6 0.2 TUZaa
V 2P 2020 08 01.92 9.4 10.0 B 25 2 7 DES01
V C/2020 F3 2020 08 01.91 6.0 10.0 B 25 & 6 6 SCI
V C/2020 F3 2020 08 01.91 5.8 5.0 B 7 6 6 0.4 TUZaa
V C/2019 U6 2020 08 01.91 9.5 10.0 B 25 3 2 DES01

more...

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
45N
Visiblity
45S
C/2020 F3 (NEOWISE) 5.5 fade 90N to 67S Evening Evening
2P/Encke 9.5 fade 70N to 90S Early evening Evening
C/2019 U6 (Lemmon) 9.5 fade 90N to 72S Best evening Evening
88P/Howell 10.0 bright 77N to 90S Evening Evening
C/2017 T2 (PANSTARRS) 10.5 fade 90N to 72S Evening Evening
C/2019 Y4 (ATLAS) 11.0 fade 90N to 89S Early evening Early evening
11P/Tempel-Swift-LINEAR 12.0 bright 90N to 66S Best morning Best morning
C/2020 F8 (SWAN) 12.0 fade 90N to 69S Early evening Early evening
C/2008 Y12 (SOHO) 12.5 bright 56N to 90S Best morning Best morning
29P/Schwassmann-Wachmann 13.0 steady 90N to 64S Best morning Early evening
58P/Jackson-Neujmin 13.0 fade 90N to 77S Early evening Early evening
C/2019 N1 (ATLAS) 13.5 bright 90N to 52S Best evening 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.

Latest news

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).

more...

Jul. 11, 2020

Comet NEOWISE Sizzles as It Slides by the Sun, Providing a Treat for Observers

Catch the comet in the morning sky until July 11, after which you can find it just after sunset until mid-August.

more...

Jul. 10, 2020

A Comet Visitor and a Pretty Metal Moon

Want to see a comet? If you live in the northern hemisphere, use binoculars to look low in the northeastern sky before sunrise for comet NEOWISE—formally C/2020 F3 (NEOWISE).

more...

Jun. 19, 2020

4,000th comet discovered by ESA and NASA Solar Observatory

On June 15, 2020, a citizen scientist spotted a never-before-seen comet in data from the Solar and Heliospheric Observatory, or SOHO -- the 4,000th comet discovery in the spacecraft's 25-year history.

more...

Jun. 08, 2020

ZWO ASI Camera type keys

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

more...