Periodic Comet 252P/LINEAR
Image of periodic comet 252P/LINEAR, obtained on 2016 May 7 (0h46-0h53UT) with 60-cm, f/3.3 Deltagraph. Exposure time 90s in LBVR filters. Copyright © 2016 by H. Mikuz, Crni Vrh Observatory.

Welcome to COBS!

Comet Observation database (COBS) was developed in 2010 and is maintained by Crni Vrh Observatory. It is a unique service offering comet observers to submit, display and analyse comet data in a single location and is opened to comet observers worldwide. Registered observers may submit the observations using a simple web-based form which will store their observations into an SQL database and display them in ICQ format.

Data stored in COBS database is freely available to everyone with respect to our data usage policy, and can be analysed with COBS online tools or exported and further used in other analysis software and publications.

Database currently contains more than 224000 comet observations of more than 1100 different comets and represents the largest available database of comet observations.

Amateur comet observers can make a useful contribution to science by observing comets and submitting their observations to the COBS, as the professional astronomers do not have the time nor the telescopes needed to gather such data. We encourage comet observers worldwide to submit their observations and contribute to the COBS database.

Light-curve of Comet 252P/LINEAR (May 20, 2016).

Recent observations

Type  Comet name  Obs date       Mag     Dia   DC  Tail     Observer
  V   252         2016 05 27.03   9.4     8    2            GOI  
  V   252         2016 05 24.91   9.9:    9    1            BOH02
  C      2015ER61 2016 05 20.78  16.6     0.31 8            NOV01
  C      2015ER61 2016 05 20.78  16.3     0.29 8            NOV01
  C   252         2016 05 20.40   9.1    22                 LEHaa
  C   252         2016 05 20.03  12.2     0.7               HILaa
  V      2013X1   2016 05 19.88   7.2    10    4            PEA  
  C      2015V2   2016 05 19.82  15.0     0.43 8            NOV01
  C      2015V2   2016 05 19.82  14.8     0.43 8            NOV01
  C      2014R3   2016 05 19.80  17.0   < 0.38 8/           NOV01
  C      2014R3   2016 05 19.80  16.9   < 0.38 8/           NOV01
  C      2013X1   2016 05 19.80   7.4    22        0.6   33 LEHaa
  V      2013X1   2016 05 19.79   7.0    10    5            CAM03
  C      2014W2   2016 05 19.40  13.1     1                 ROW  
  C   252         2016 05 19.38  10.9     3.9               ROW  

                            

Comet Observing Planner

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Session length:
Limiting mag:
Min altitude:

Current comet magnitudes and observable region (May 3)

Comet                     Magnitude   Trend    Observable     When visible
PanSTARRS (2013 X1)            7.5    steady   40 N to 85 S   morning
252P/LINEAR                    8      fade     60 N to 70 S   all night
PanSTARRS (2014 S2)           10.5    fade     60 N to 25 S   all night
81P/Wild                      11      bright   55 N to 40 S   evening
PanSTARRS (2015 WZ)           11      bright   55 N to 25 S   all night
Catalina (2013 US10)          11.5    fade     60 N to 20 N   evening
PanSTARRS (2014 W2)           12.5    steady   60 N to 10 N   all night
116P/Wild                     12.5    steady   35 N to 85 S   best morning
104P/Kowal                    12.5    fade     Poor elongation
9P/Tempel                     13      bright   60 N to 40 S   best evening
Spacewatch (2011 KP36)        13      steady    0 N to 40 S   morning
29P/Schwassmann-Wachmann      13 ?    varies   35 N to 90 S   morning
Lovejoy (2014 Q2)             13      fade     60 N to 35 S   best morning
77P/Longmore                  13.5    steady   35 N to 65 S   best evening
333P/LINEAR                   13.5    fade     Poor elongation

List of comets maintained by Jonathan Shanklin at http://www.ast.cam.ac.uk/~jds.


Latest news

May. 23, 2016

CometWatch 15 May

This week’s CometWatch entry from Rosetta’s NAVCAM was taken on 15 May 2016 when the spacecraft was 9.88 km from Comet 67P/Churyumov-Gerasimenko.

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May. 15, 2016

Hubble catches views of a jet rotating with Comet 252P/LINEAR

This sequence of images taken by NASA's Hubble Space Telescope shows Comet 252P/LINEAR as it passed by Earth. The visit was one of the closest encounters between a comet and our planet.

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May. 15, 2016

CometWatch 1 May

This week's CometWatch is an image taken with Rosetta's NAVCAM on 1 May 2016, when the spacecraft was 18.8 km from the nucleus of Comet 67P/Churyumov-Gerasimenko.

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May. 02, 2016

CometWatch 24 April

This week's CometWatch was taken by Rosetta's NAVCAM on 24 April 2016, 28 km from the nucleus of Comet 67P/Churyumov-Gerasimenko.

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Apr. 28, 2016

CometWatch 19 April

This week's CometWatch features an image obtained with Rosetta's NAVCAM on 19 April 2016, 29.4 km from the nucleus of Comet 67P/Churyumov-Gerasimenko.

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