Director: Nick James
Jun 13 Masanori Uchina reports a Kreutz group comet in real time C2 images Jun 14 Masanori Uchina reports a Kreutz group comet in real time C2 images Jun 16 Worachate Boonplod reports a Kreutz group comet in real time C2 images Jun 18 Worachate Boonplod reports two Kreutz group comets in real time C2 images Jun 18 Worachate Boonplod reports a Kreutz group comet in real time C3 images Jun 19 Worachate Boonplod reports a Meyer group comet in real time C2 images Jun 21 Masanori Uchina reports a Kreutz group comet in real time C2 images Jun 24 Discovery of 2019 K4 (Ye) reported Jun 24 Masanori Uchina reports a Kreutz group comet in real time C2 images Jun 25 Worachate Boonplod reports a Kreutz group comet in real time C3 images Jun 26 Discovery of 2019 L1 (PanSTARRS) reported Jun 27 Discovery of 2019 K5 (Young) reported Jun 27 Trygve Prestgard reports a Kreutz group comet in real time C2 images Jun 28 Discovery of 2019 L2 (NEOWISE) reported Jun 28 Zhijian Xu reports two Kreutz group comets in real time C2 images Jun 29 Worachate Boonplod reports a Kreutz group comet in real time C2 images Jul 01 Discovery of A/2019 K6 [PanSTARRS] reported Jul 01 Discovery of 2019 L3 (ATLAS) reported Jul 01 Discovery of 2019 K7 (Smith) reported Jul 01 Discovery of 2019 K8 (ATLAS) reported Jul 02 Trygve Prestgard reports a Kreutz group comet in delayed C2 images Jul 02 Discovery of 2019 LB7 (Kleyna) reported Jul 03 Worachate Boonplod reports a Marsden group comet in real time C2 images Jul 05 Recovery of 2006 S1 (P/Christensen) as 2019 M1 reported Jul 07 Worachate Boonplod reports a Kreutz group comet in real time C2 images Jul 08 Masanori Uchina reports a Kreutz group comet in real time C2 images Jul 10 Worachate Boonplod reports a Kreutz group comet in real time C3 images Jul 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 PanSTARRS (2017 T2) 10 bright 30 N to 45 S early morning 2019 April Lemmon (2018 R3) 10 fade Poor elongation 2019 July Africano (2018 W2) 12 bright 50 N to 20 N best morning 2019 July Lemmon (2018 W1) 12 fade 25 S to 90 S evening Not yet observed ASASSN (2018 N2) 12.5 bright 35 N to 50 S morning 2019 January 29P/Schwassmann-Wachmann 13 ? varies 50 N to 50 S early morning 2019 May ATLAS (2017 M4) 13.5 ? fade 15 N to 90 S evening 2018 October PanSTARRS (2016 R2) 13.5 ? fade 50 N to 15 S all night 2019 JanuaryPartial updates: July 6 (2018 R3, 2018 W2), July 9 (2017 T2). 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 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 2019 March 28]. The dotted lines represent 99% confidence limits. 2017 T2 - two versions are presented. One a simple fit to the observations, the second a forced fit to a slower rate of brightening.
Comet magnitude parameters [ updated 2019 July 2].
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.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 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, 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, Jose Navarro Pina, Gabriel Oksa, Mieczyslaw Paradowski, Nirmal Paul, Stuart Rae, Walter Robledo, Tony Scarmato, Willian Souza, David Strange Johan Warrell 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.