Director: Nick James
Aug 20 Worachate Boonplod reports a Kreutz group comet in real time C3 images Aug 20 Trygve Prestgard reports a Kreutz group comet in real time C3 images Aug 23 Discovery of 2017 P2 (PanSTARRS) reported Aug 23 Hanjie Tan reports a Kreutz group comet in real time C3 images Aug 24 Masanori Uchina reports a Kreutz group comet in real time C3 images Aug 24 Masanori Uchina reports a non-group comet in real time C2 images Aug 25 Recovery of 2012 T1 (P/PanSTARRS) as 2017 O3 reported Aug 25 Asteroid 2007 RS41 found to show cometary features as 2017 Q2 (P/LONEOS) Aug 26 Rainer Kracht reports a Meyer group comet in delayed C2 images Aug 26 Rainer Kracht reports a Marsden group comet in real time C2 images Aug 31 Hanjie Tan reports a Kreutz group comet in real time C3 images Sep 02 Xavier Leprette and Worachate Boonplod report a Meyer group comet in real time C2 images Sep 02 Worachate Boonplod reports a Kreutz group comet in real time C3 images Sep 03 Worachate Boonplod reports a Kreutz group comet in real time C3 images Sep 05 Hanjie Tan reports a Kreutz group comet in real time C3 images Sep 06 Trygve Prestgard reports a Kreutz group comet in real time C3 images Sep 06 Trygve Prestgard reports a non-group comet in STEREO images Sep 06 Zhijian Xu reports a Kreutz group comet in real time C3 images Sep 09 Worachate Boonplod reports a Kreutz group comet in real time C3 images Sep 11 Worachate Boonplod reports a Kreutz group comet in real time C3 images Sep 15 Worachate Boonplod reports a Kreutz group comet in real time C3 images Sep 18 Masanori Uchina reports a Kreutz group comet in real time C2 images Sep 19 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 ASASSN (2017 O1) 9 bright 65 N to 65 S best morning 2017 September Johnson (2015 V2) 10 fade 20 N to 85 S evening 2017 September PanSTARRS (2015 ER61) 11.5 fade 65 N to 45 S best morning 2017 September 71P/Clark 12 fade 20 N to 85 S best evening 2017 August 217P/LINEAR 12 fade 55 N to 40 S early morning 2017 August 29P/Schwassmann-Wachmann 13 ? varies 50 N to 80 S best evening 2017 September PanSTARRS (2016 R2) 13.5 ? bright 55 N to 70 S early morning Not yet observed Lemmon-Yeung-PanS (2015 VL62) 13.5 steady 60 N to 60 S best morning 2017 August PanSTARRS (2015 O1) 13.5 steady 60 N to 25 S evening 2017 July 24P/Schaumasse 14 ? bright 35 N to 0 S early morning Not yet observedThe 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 August 30]. The dotted lines represent 99% confidence limits. 2017 O1.
Comet magnitude parameters [ updated 2017 August 30].
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.