Latest image

Comet C/2018 Y1 (Iwamoto)
Image of comet C/2018 Y1 (Iwamoto), passing the open clusters M38 and NGC 1907 in Auriga. Obtained on 2019 Feb. 28 (21h40-22h47UT) with 15-cm, f/6 Maksutov-Cassegrain astrograph and Canon EOS 6D DSLR. Exposure time was 66 minutes at ISO 3200.
Copyright © 2019 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 240000 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/2018 Y1 (Iwamoto) (May 19, 2019).

Type Comet name Obs date Mag App T Pow Dia DC Tail PA Obs
C C/2019 D1 2019 05 15.44 13.0 10.6 R A080 5.8 0.18 258 LEHaa
C C/2016 R2 2019 05 15.02 15.2 20.0 L F482 2.4 LEHaa
C C/2018 W2 2019 05 14.89 14.5 20.0 L C482 1.9 0.02 44 LEHaa
C 68P 2019 05 14.46 16.6 61.0 Y a180 0.11 BUIaa
C 29P 2019 05 14.21 11.6 50.0 T a 50 & 1.2 D5 PAUaa
C 29P 2019 05 13.20 11.8 50.0 T a 50 & 1 D5 PAUaa
C C/2017 K2 2019 05 13.01 17.0 20.0 L I965 0.8 LEHaa
C C/2018 W2 2019 05 12.90 14.2 20.0 L E764 2.7 0.02 57 LEHaa
C C/2017 K2 2019 05 12.44 17.1 61.0 L a120 0.5 RAMaa
C C/2016 M1 2019 05 12.36 12.6 10.6 R a720 5 0.16 179 LEHaa
C C/2019 D1 2019 05 09.43 13.0 10.6 R A980 6.1 0.17 256 LEHaa
C 158P 2019 05 09.08 18.8 50.0 L a300 0.2 HILaa
V 29P 2019 05 08.78 13.7 25.0 L 83 0.5 6 WYA
V C/2017 B3 2019 05 08.74 14.4 25.0 L 83 0.6 2/ WYA
C C/2017 M4 2019 05 08.50 12.7 10.6 R a180 2.6 2.7m 13 RAMaa
V C/2018 A6 2019 05 08.46 14.0 25.0 L 83 0.7 3 WYA
V C/2017 M4 2019 05 08.46 12.8 25.0 L 39 2 3 WYA
C C/2019 D1 2019 05 08.23 14.3 50.0 L a 80 0.5 HILaa
C 143P 2019 05 08.22 19.2 50.0 L a210 0.2 HILaa
C C/2016 R2 2019 05 08.11 13.8 50.0 L a150 1 HILaa

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Comet Observing Planner

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Current comet magnitudes and observable region

Comet name Mag Trend Observable Visiblity
45N
Visiblity
45S
C/2016 M1 (PANSTARRS) 12.5 fade 55N to 90S Early evening Evening
C/2017 T2 (PANSTARRS) 13.0 bright 90N to 79S Poor elongation Poor elongation
29P/Schwassmann-Wachmann 13.5 steady 90N to 79S Early evening Early evening
C/2017 M4 (ATLAS) 13.5 steady 49N to 90S Best morning Best morning
123P/West-Hartley 14.0 fade 90N to 72S Best evening Best evening
C/2018 R3 (Lemmon) 14.0 bright 90N to 31S All night Never up
C/2018 N2 (ASASSN) 14.0 steady 89N to 90S Early evening Early evening
78P/Gehrels 14.0 fade 90N to 72S Poor elongation Poor elongation
C/2018 A6 (Gibbs) 14.0 steady 37N to 90S Never up Never up

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

May. 15, 2019

New Comet C/2019 J1 (Lemmon)

CBET 4625 & MPEC 2019-J122, issued on 2019, May 12, announce the discovery of a comet (magnitude ~17.5) in the course of the "Mt. Lemmon Survey" (G96), in images taken on 2019, May 04 with a 1.5-m reflector + 10K CCD. This object was reported as a comet by R. A. Kowalski and D. Rankin (G96, May 4). The new comet has been designated C/2019 J1 (Lemmon).

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Apr. 23, 2019

Comet cat

From a distance of five million kilometres to within 20 metres, ESA’s Rosetta spacecraft captured images of Comet 67P/Churyumov-Gerasimenko from all angles.

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Apr. 16, 2019

Tiny fragment of a comet found inside a meteorite

Astronomers have made a surprising discovery that gives clues to how solar system formed.

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Apr. 02, 2019

Comets & Asteroids - Summary for Jan & Feb 2019

During the 2-month period January through February 2019, 14 new comets were discovered. Moreover inner main-belt minor planet (6478) GAULT developed a lengthening tail or trail.

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Mar. 29, 2019

Hubble watches spun-up asteroid coming apart

A small asteroid has been caught in the process of spinning so fast it's throwing off material, according to new data.

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