Director: Nick James
Jul 19 Worachate Boonplod reports a Kreutz group comet in real time C3 images Jul 19 Trygve Prestgard reports a Kreutz group comet in real time C3 images Jul 21 Worachate Boonplod reports a Kreutz group comet in real time C3 images Jul 23 Worachate Boonplod reports a Kreutz group comet in real time C3 images Jul 24 Discovery of 2017 O1 reported Jul 24 Worachate Boonplod reports a Kreutz group comet in real time C3 images Jul 25 Zhijian Xu reports a Kreutz group comet in real time C3 images Jul 30 Salil Mulye reports a Kreutz group comet in real time C3 images Aug 01 Masanori Uchina reports a Meyer group comet in real time C2 images Aug 02 Worachate Boonplod reports a Meyer group comet in real time C2 images Aug 03 Recovery of 2010 D1 (P/WISE) reported Aug 03 Peter Birtwhistle reports possible cometary activity in 2017 MB1 Aug 03 Worachate Boonplod reports a Kreutz group comet in real time C3 images Aug 04 Worachate Boonplod reports a Kreutz group comet in real time C3 images Aug 05 Worachate Boonplod reports a Kreutz group comet in real time C3 images Aug 09 Worachate Boonplod reports a Meyer group comet in real time C2 images Aug 09 Worachate Boonplod reports a Kreutz group comet in real time C3 images Aug 10 Zhijian Xu reports a Kreutz group comet in real time C3 images Aug 14 Worachate Boonplod reports a Kreutz group comet in real time C3 images Aug 16 Zhijian Xu reports a Kreutz group comet in real time C3 images Aug 17 Discovery of 2017 P1 (P/PanSTARRS) reported Aug 18 Update
If there have been no recent updates try The German comet group page or Seiichi Yoshida's page for information or the Liga Iberoamericana de Astronomia for observations.
Comet Magnitude Trend Observable When visible Last visual observation Johnson (2015 V2) 9 fade 35 N to 90 S evening 2017 August PanSTARRS (2015 ER61) 10 fade 55 N to 50 S morning 2017 August ASASSN1 (2017 O1) 10 bright 50 N to 75 S early morning 2017 August 71P/Clark 11 fade 35 N to 90 S best evening 2017 August PanSTARRS (2016 R2) 11 ? bright 30 N to 70 S morning Not yet observed 217P/LINEAR 12.5 fade 25 N to 25 S early morning 2017 August 29P/Schwassmann-Wachmann 13 ? varies 50 N to 80 S best morning 2017 July Lemmon-Yeung-PanS (2015 VL62) 13 ? steady 55 N to 45 S best morning Not yet observed 65P/Gunn 14 fade 25 N to 70 S evening Not yet observed PanSTARRS (2015 O1) 14 steady 55 N to 25 S best evening 2017 JulyThe observable region is an approximate indication of the latitude at which the comet may be seen. Under good conditions comets may be visible outside this range. The period when visible is for the UK if the comet is visible from the UK, otherwise for 40 S or the Equator as appropriate. The last visual observation is as received by the Section, details are often updated on the basis of observations published elsewhere. Details are normally fully updated at the beginning of each month, but may be updated more frequently for comets brighter than 10th magnitude; the date of the most recent partial update, which may apply to only one object, is given. Beginners will often find comets fainter than about 7th magnitude difficult to locate - see below for information on positions and finder charts.
Light curves of comets brighter than 10th magnitude or predicted to become that bright (aperture corrected for potential naked eye comets) [click on thumbnail to get the full scale image, updated on July 3]. The dotted lines represent 99% confidence limits. 2015 V2.
Comet magnitude parameters [ updated 2017 August 1].
Longer period ephemerides are given here for planning purposes for comets that may reach naked eye brightness. All are for the UK. The ephemerides give B1950 and J2000 positions. Modern star charts use J2000, but older atlases will use B1950. The predicted magnitudes are extremely uncertain.
Planning aids and information for forthcoming comets
The MPC also has a list of the last observation for all comets. Electronic observers should try and observe any comets that have not recently been observed according to the CBAT but which are expected to be within range of their equipment. Negative observations are also useful. In addition, the MPC has orbital elements for unusual asteroids, many of which have cometary orbits.
Download Richard Fleet's GraphDark software for graphically displaying comet (and other object) visibility. Latest version is 2.05, 2007 May.
Download William Schwittek's CometWin software for generating comet ephemerides and visibility diagrams. [Updated 2002 March 5]
Download Solex, N-body solar system dynamics software.
Visual and visual equivalent magnitude observations should be sent to me at <jds [at] ast.com.ac.uk> in simple text format. Visual observers can use the BAA visual report form to log observations. To avoid the use of multiple formats the ICQ format , which uses special keys to code observation particulars, is now standardised as the one to use for submission and archiving of observations. The ICQ have not updated their observation keys since 2010, so these additional keys are suggested for use when submitting observations to the BAA (updated 2017 January 4). Crni Vhr Observatory has launched the Comet Observation Database which allows entry of observations in ICQ format, and plots of light curves. Visual observations entered using this system should be emailed to me at the end of the month. Observations are usually analysed and sent to TA as soon as possible after the end of the month; any late observations will be used in subsequent analyses. Observations will continue to be published by Guy Hurst in The Astronomer magazine in TA format. There is also a visual drawing form. The German comet group also has a computer program that will correctly format observations for the ICQ [2009 December].
Images should be sent to Denis Buczynski.
Regular contributors include James Abbott, Jose Aguiar, Alexander Amorim, Nicolas Biver, Denis Buczynski, Paul Camilleri, Matyas Csukas, Roger Dymock, John Fletcher, Marco Goiato, Juan Gonzalez, Bjorn Granslo, Kevin Hills, Nick James, Werner Hasubick, Heinz Kerner, Carlos Labordena, Rolando Ligustri, Michael Mattiazzo, Maik Mayer, Antonio Milani, Martin Mobberley, Jose Navarro Pina, Gabriel Oksa, Mieczyslaw Paradowski, Stuart Rae, Walter Robledo, Tony Scarmato, Willian Souza, David Strange and Seiichi Yoshida, several of whom contribute observations from their colleagues.
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Many thanks to those that regularly access this page for your interest. If you have any comments, suggestions for improvement or find any problems, please email the visual co-ordinator, Jon Shanklin, at j.shanklin @ bas.ac.uk. If you need to phone me, my home number is +44 (0)1223 571250 or my BAS number is +44 (0)1223 221482. Snail mail will reach me at the British Antarctic Survey, Madingley Road, CAMBRIDGE CB3 0ET, England. For information about my work with BAS see my web page at BAS.