Director: Nick James
Dec 25 A Happy Christmas to all comet observers Dec 25 Peiyuan Sun reports a Kreutz group comet in real time C2 images Dec 26 Szymon Liwo reports a Kreutz group comet in real time C2 images Dec 30 Bo Zhou reports a Kreutz group comet in real time C3 images Dec 31 Masanori Uchina reports a Kreutz group comet in real time C2 images Jan 01 A Happy New Year to all comet observers Jan 01 William Li reports a Kreutz group comet in real time C2 images Jan 01 Worachate Boonplod reports a Meyer group comet in real time C2 images Jan 02 Peiyuan Sun reports a Kreutz group comet in real time C3 images Jan 05 Zhijian Xu reports a Kreutz group comet in real time C2 images Jan 05 Worachate Boonplod reports a Kreutz group comet in real time C2 images Jan 05 Bo Zhou reports a non-group comet in real time C3 images Jan 06 Discovery of 2017 A1 (PanSTARRS) reported Jan 06 Discovery of 2017 A2 (P/PanSTARRS) reported Jan 06 Trygve Prestgard reports two Kreutz comets in STEREO images Jan 08 Trygve Prestgard reports two Kreutz comets in STEREO images Jan 11 Discovery of 2017 A3 (Elenin) reported Jan 13 Trygve Prestgard reports a Kreutz comet in STEREO images Jan 14 Masanori Uchina reports a Meyer group comet in real time C2 images Jan 15 Trygve Prestgard reports a Kreutz comet in STEREO images Jan 19 Zhijian Xu reports a Kreutz group comet in real time C3 images Jan 19 Khadija El Kanbi reports a Kreutz comet in STEREO images Jan 21 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 45P/Honda-Mrkos-Pajdusakova 7 steady 40 N to 10 S early evening 2017 January NEOWISE (2016 U1) 7.5 bright Poor elongation 2017 January Johnson (2015 V2) 10.5 bright 90 N to 15 S morning 2017 January PanSTARRS (2015 ER61) 10.5 bright 50 N to 50 S early morning 2017 January 73P/Schwassmann-Wachmann 11.5 bright 50 N to 35 S early morning 2017 January 2P/Encke 12 bright 65 N to 25 S evening 2017 January 144P/Kushida 12.5 fade 50 N to 45 S early morning 2016 December PanSTARRS (2016 R2) 13 ? bright 20 N to 50 S best evening Not yet observed 29P/Schwassmann-Wachmann 13 ? varies Poor elongation 2016 November 237P/LINEAR 13 fade Poor elongation 2016 November 43P/Wolf-Harrington 13 fade 35 N to 50 S morning 2016 December Spacewatch (2011 KP36) 13 fade 55 N to 45 S evening 2016 November PanSTARRS (2013 X1) 14 fade 10 N to 40 S early morning 2016 August 41P/Tuttle-Giacobinni-Kresak [14 ? bright 65 N to 50 S best 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 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 January 1]. The dotted lines represent 99% confidence limits. 2015 ER61, 2015 V2
Comet magnitude parameters [ updated 2017 January 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.
Warning I receive a large number of emails containing viruses or other junk. Please try and make clear that your message is legitimate, otherwise it may be deleted without being read. It is advisable to use your own name, rather than an alias, in the 'from' field and use an obvious, recent subject.
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.