Director: Nick James
Jul 11 Worachate Boonplod reports a Kreutz group comet in real time C3 images Jul 11 Hanjie Tan reports a Kreutz group comet in real time C3 images Jul 12 Recovery of 2012 O3 (P/McNaught) as 2022 G2 reported Jun 12 Zhijian Xu reports a Kreutz group comet in real time C3 images Jul 14 Hanjie Tan reports a Kreutz group comet in real time C3 images Jul 15 Zesheng Yang reports a Kreutz group comet in real time C3 images Jul 19 Worachate Boonplod reports a Marsden group comet in real time C3 images Jul 19 Worachate Boonplod reports a Kreutz group comet in real time C3 images Jul 21 Jiangao Ruan reports a Kreutz group comet in archival C3 images Jul 22 Discovery of 2021 R9 (P/Sheppard-Tholen) reported Jul 22 Hanjie Tan reports ten comets in archival C2 images Jul 22 Worachate Boonplod reports a Kreutz group comet in real time C3 images Jul 23 Zesheng Yang reports a Kreutz group comet in real time C3 images Jul 24 Jiangao Ruan reports two Kreutz group comets in archival C2 images Jul 26 Zesheng Yang reports a Kreutz group comet in real time C3 images Jul 27 Zesheng Yang reports a Meyer group comet in real time C2 images Jul 28 Zhuoyang Chen reports a Kreutz group comet in archival C2 images Aug 03 Jiangao Ruan reports a Kreutz group comet in archival C2 images Aug 03 Shaoxiong Gu reports a Kreutz group comet in real time C3 images Aug 05 Cometary activity reported in 2019 G4 Aug 05 Zesheng Yang reports a Kreutz group comet in real time C3 images Aug 05 Rafal Biros reports a Kreutz group comet in real time C3 images Aug 06 Hanjie Tan reports five comets in archival C2 images Aug 07 Hanjie Tan reports two comets in archival C2 images Aug 08 Sam Deen discovers 2020 A4 (P/PanSTARRS-Lemmon) in archived data Aug 08 Zhuoyang Chen reports a Meyer group comet in real time C2 images Aug 09 Jiangao Ruan reports a Kreutz group comet in archival C2 images Aug 09 Hanjie Tan reports a non-group comet in archival C2 images Aug 09 Death of noted comet discoverer Don Machholz reported Aug 10 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 2017 K2 (PanSTARRS) 8.5 steady 55 N to 90 S evening 2022 August 2021 P4 (ATLAS) 10.5 steady Poor elongation 2022 June 2021 E3 (ZTF) 11.5 fade 25 S to 90 S early evening 2022 June 2019 L3 (ATLAS) 11.5 fade Poor elongation 2022 May 73P/Schwassmann-Wachmann 12.5 bright 20 N to 55 S early evening 2022 July 2019 T4 (ATLAS) 12.5 fade 20 N to 60 S evening 2022 June 2020 V2 (ZTF) 13 steady Poor elongation 2022 June 22P/Kopff 13 fade 55 N to 55 S morning 2022 July 255P/Levy 13 ? bright Poor elongation Not yet observed 29P/Schwassmann-Wachmann 13 ? varies Poor elongation 2022 April 2022 E3 (ZTF) 13.5 bright 55 N to 25 S all night 2022 August 2020 R7 (ATLAS) 13.5 steady 5 N to 90 S best evening 2022 July 2020 K1 (PanSTARRS) 13.5 steady 55 N to 50 S best evening 2022 August 117P/Helin-Roman-Alu 13.5 fade 25 N to 90 S best evening 2022 July 2019 U5 (PanSTARRS) 14 steady 50 N to 25 S early evening 2022 July 116P/Wild 14 fade 15 N to 55 S early evening 2022 JuneDetails are usually fully updated at the beginning of each month, but some minor updates may be made more frequently, particularly for brighter comets. The last (full) update was on August 1. The magnitude is a rough value for the mean magnitude reported; some observers will see the comet brighter than this, whilst others will see it fainter. The 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. 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 that may become brighter than 8th magnitude (aperture corrected for potential naked eye comets) [click on thumbnail to get the full scale image, updated on 2022 August 1]. The dotted lines represent 99% confidence limits. 2022 E3.
Comet magnitude parameters [ updated 2022 August 1].
Planning aids and information for forthcoming comets, valid out to about 2025.
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.cam.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 2020 October 3). 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 with a TA deadline of the 2nd; 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, Peter Carson, Matyas Csukas, Roger Dymock, John Fletcher, Marco Goiato, Juan Gonzalez, Bjorn Granslo, Werner Hasubick, Kevin Hills, Nick James, Heinz Kerner, Carlos Labordena, Rolando Ligustri, Michael Mattiazzo, Maik Mayer, Antonio Milani, Martin Mobberley, Giuseppe Pappa, Jose Navarro Pina, Gabriel Oksa, Mieczyslaw Paradowski, Nirmal Paul, Stuart Rae, Walter Robledo, Tony Scarmato, Willian Souza, David Strange, Johan Warrell, Chris Wyatt and Seiichi Yoshida, several of whom contribute observations from their colleagues. Thanks are due to all of them.
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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.