Latest image

C/2020 R4 (ATLAS)
Image of comet C/2020 R4 (ATLAS), obtained on 2021 May 10 (20h24-20h49UT) with 19-cm, f/4 Flat Field Camera and Canon EOS 700D DSLR. Exposure time was 23x60 seconds at ISO 3200. Total exposure time 23 minutes.
Copyright © 2021 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 260000 comet observations of more than 1400 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 T2 (Palomar) (Aug 05, 2021).

Type Comet name Obs date Mag App T Pow Dia DC Tail PA Obs
V C/2017 K2 2021 08 02.94 12.0: 25.0 L 167 & 1 3 FIL04
V C/2015 K2 2021 08 02.00 12.7 29.8 L 132 0.9 2 HAR11
C 7P 2021 07 31.97 10.5 20.0 L a720 19 0.14 267 LEHaa
C C/2020 F5 2021 07 31.95 14.4 20.0 L a900 1.6 0.16 207 LEHaa
C C/2017 K2 2021 07 31.94 13.2 10.0 R A202 2.5 0.06 19 FRIaa
C C/2018 U1 2021 07 31.77 15.3 20.0 L a900 1.3 0.07 41 LEHaa
V 7P 2021 07 31.51 11.8 40.0 L 59 6 3/ WYA
V C/2019 F1 2021 07 31.51 14.7 40.0 L 261 0.5 5/ WYA
V C/2018 U1 2021 07 31.50 15.0 40.0 L 261 0.5 3/ WYA
V C/2020 F5 2021 07 31.50 14.7 40.0 L 182 0.5 6 WYA
V C/2020 T2 2021 07 31.48 10.4 40.0 L 59 4 6 WYA
V C/2017 K2 2021 07 31.48 13.2 40.0 L 108 1 3/ WYA
C C/2019 L3 2021 07 30.97 11.7 27.9 L A320 2.9 0.07 310 LEHaa
C C/2019 U5 2021 07 30.92 16.4 27.9 L A440 0.7 0.4m 86 LEHaa
C C/2021 A1 2021 07 30.89 16.2 27.9 L B520 0.7 1.2m 67 LEHaa
V C/2020 T2 2021 07 30.88 9.7 12.0 R 50 4 1 PIL01
C C/2020 T2 2021 07 30.76 10.0 20.0 L a720 16 0.15 100 LEHaa
C 117P 2021 07 30.74 15.8 20.0 L A080 1.5 0.04 305 LEHaa
V C/2020 F5 2021 07 30.50 14.9 40.0 L 182 0.6 5/ WYA
V 7P 2021 07 30.50 13.0 40.0 L 108 1.9 6 WYA

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Comet Observing Planner

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Limiting mag:
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Current comet magnitudes and observable region

Comet name Mag Trend Observable Visiblity
45N
Visiblity
45S
8P/Tuttle 10.0 bright 90N to 69S Early evening Early evening
C/2020 T2 (Palomar) 10.5 fade 84N to 90S Evening Best evening
C/2021 O1 (Nishimura) 11.0 bright 90N to 59S Poor elongation Poor elongation
342P/SOHO 11.0 bright 43N to 90S Never up Never up
C/2019 L3 (ATLAS) 11.0 bright 90N to 43S All night Never up
15P/Finlay 11.5 fade 90N to 65S Early evening Early evening
4P/Faye 12.0 bright 90N to 72S Best morning Early evening
7P/Pons-Winnecke 12.0 fade 42N to 90S Never up Never up
C/2020 X3 (SOHO) 12.5 fade 68N to 90S Evening Best evening
C/2017 K2 (PANSTARRS) 13.0 steady 90N to 52S Best morning Evening
67P/Churyumov-Gerasimenko 13.5 bright 90N to 83S Best morning Best morning
P/2013 PA104 (PANSTARRS) 13.5 fade 84N to 90S Best evening Best evening
C/2020 J1 (SONEAR) 14.0 fade 83N to 90S Evening Evening
205P-B/Giacobini 14.0 bright 90N to 76S Best morning Best morning
29P/Schwassmann-Wachmann 14.0 steady 90N to 60S Best morning Early evening
C/2019 T4 (ATLAS) 14.0 steady 68N to 90S Early 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

Aug. 05, 2021

New Comet C/2021 O3 (PANSTARRS)

CBET xxxx & MPEC 2021-P05, issued on 2021, August 01, announce the discovery of a new comet (magnitude ~20) on CCD images taken on July 26.5 UT with the Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala. The new comet has been designated C/2021 O3 (PANSTARRS).

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Jul. 27, 2021

New Comet C/2021 N3 (PANSTARRS)

CBET 5003 & MPEC 2021-O39, issued on 2021, July 22, announce the discovery of a new comet (magnitude ~20.5) on CCD images taken on July 13.5 UT with the Pan-STARRS1 1.8-m Ritchey-Chretien reflector at Haleakala (numerous pre-discovery observations going back an additional month were later identified). The new comet has been designated C/2021 N3 (PANSTARRS).

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Jul. 24, 2021

New Comet P/2021 N2 (Fuls)

CBET 5000 & MPEC 2021-N137, issued on 2021, July 15, announce the discovery of a new comet (magnitude ~18.3) on CCD images taken on July 09.4 UT with the Catalina Sky Survey's 0.68-m Schmidt reflector (pre-discovery Catalina observations from June 27 were identified later). The new comet has been designated P/2021 N2 (Fuls).

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Jun. 15, 2021

New Comet C/2021 K2 (MASTER)

CBET 4975 & MPEC 2021-L89, issued on 2021, June 09, announce the discovery of a new comet (magnitude ~19.0) on CCD images taken on May 23.0 UT with the "Mobile Astronomical System of the Telescope-Robots" (MASTER) auto-detection system (double 0.40-m f/2.5 reflector) at the South African Astronomical Observatory. The object was reported by MASTER as a new NEO candidate and has been found to show cometary activity by CCD astrometrists elsewhere. The new comet has been designated C/2021 K2 (MASTER).

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Jun. 05, 2021

New Comet C/2021 J1 (Maury-Attard)

CBET 4972 & MPEC 2021-L11, issued on 2021, June 02, announce the discovery of a new comet (magnitude ~19.0) on CCD images taken by A. Maury and G. Attard on May 09.3 UT with the 0.28-m f/2.2 Rowe-Ackermann Schmidt astrograph at San Pedro de Atacama, Chile in the course of the MAP (W94) survey. The new comet has been designated C/2021 J1 (Maury-Attard). This is the first amateur comet discovery of 2021. It is also the first comet ever discovered using the synthetic tracking technique (using TYCHO software).

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