British Astronomical Association

Comet Section

Director: Nick James

Visual observations page


(Co-ordinator Jonathan Shanklin)

Latest Discoveries

Jun 21  Recovery of 2010 A2 (P/LINEAR)as 2017 B5 reported
Jun 21  Worachate Boonplod reports a Kreutz group comet in real time C2 images
Jun 22  Recovery of 2004 T1 (P/LINEAR-NEAT) as 2017 M2 reported
Jun 23  Discovery of 2017 M3 (PanSTARRS) reported
Jun 23  Discovery of 2017 M4 (ATLAS) reported
Jun 23  Worachate Boonplod and Masanori Uchina report a Kreutz group comet in real time C2 images
Jun 24  Worachate Boonplod reports two Kreutz group comets in real time C2 images
Jun 28  Masanori Uchina reports a Kreutz group comet in real time C3 images
Jun 29  Masanori Uchina reports a Kreutz group comet in real time C2 images
Jul 01  Discovery of 2017 M5 (TOTAS) reported 
Jul 01  Worachate Boonplod reports a Meyer group comet in real time C2 images
Jul 02  Worachate Boonplod reports a Kreutz group comet in real time C2 images
Jul 03  Worachate Boonplod reports a Kreutz group comet in real time C3 images
Jul 03  Cometary activity in Hilda group asteroid (457175) reported
Jul 05  Worachate Boonplod reports a Kreutz group comet in real time C2 images
Jul 06  Masanori Uchina reports a Kreutz group comet in real time C2 images
Jul 08  Masanori Uchina and Worachate Boonplod report a Kreutz group comet in real time C2 images
Jul 09  Worachate Boonplod 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  Worachate Boonplod reports two Kreutz group comets in real time C2 images
Jul 15  Worachate Boonplod reports a Meyer group comet in real time C2 images
Jul 16  Salil Mulye reports a Kreutz group comet in real time C3 images
Jul 16  Worachate Boonplod reports a Meyer group comet in real time C2 images
Jul 17  Worachate Boonplod reports a Kreutz group comet in real time C3 images
Jul 18  Worachate Boonplod reports a Meyer group comet in real time C2 images
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 20  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.


Elsewhere on these pages: Highlights / Newly discovered comets / Periodic comets / Contributing observations / Comet Ephemerides / Upcoming Comets / Observing Comets / Links / Meetings / Publications / Comments and Contacts / Old 2017 News / Comet discovery procedure / Weather information / The Comet's Tale / BAA Comet Section image archive / Project Alcock / More information / Legacy page

Current comet magnitudes (July 10) and observable region (July 3)

Comet	                  Magnitude   Trend    Observable     When visible        Last visual observation
Johnson (2015 V2)              8.5    fade     50 N to 90 S   evening             2017 July
PanSTARRS (2015 ER61)          9      fade     50 N to 55 S   early morning       2017 July
71P/Clark                     10.5    steady   35 N to 90 S   best evening        2017 July
41P/Tuttle-Giacobinni-Kresak  11.5    fade     45 N to 55 S   best evening        2017 July
PanSTARRS (2016 R2)           12 ?    bright   10 S to 70 S   early morning       Not yet observed
29P/Schwassmann-Wachmann      13 ?    varies   50 N to 80 S   early morning       2017 July
65P/Gunn                      13.5    steady   30 N to 75 S   best evening        Not yet observed
PanSTARRS (2015 O1)           14      steady   50 N to 25 S   all night           Not yet observed
Lovejoy (2017 E4)             14      fade     Poor elongation                    2017 April
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.   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.

Highlights and News

  1. 2015 ER61 brightened by over a magnitude at the end of March, and the evidence now shows that this was an outburst.  The comet is fading.  It is a morning object and doesn't get into the evening sky until August, by which time it will be around 10th magnitude.
  2. 2015 V2 has passed its brightest and is best in the evening, but is rapidly sinking into the evening twilight.
  3. There is to be a Pro-am observing campaign on 46P/Wirtanen in 2018.  There is a brief observing window for UK observers in September which will be useful for determing the magnitude parameters at this return, but it is best seen from the southern hemisphere during this period.   It quickly moves into the evening sky in mid November, and could be a naked eye object in December.  It makes a close approach to Earth on 2018 December 16, passing 0.078 au from us.  It could remain within visual range until March.
  4. The comet predictions for 2019 were published in early January. They, and the 2018 predictions, were updated in June.
  5. The Section welcomes observations from all comet enthusiasts, whether members of the BAA or not.  An advantage of joining the BAA is that you can read papers on comets published in the BAA Journal.  The February Journal includes a paper on "The brighter comets of 2009".  Further papers in this series are in press or in draft.
  6. Thanks to the many observers who have sent in their observations in ICQ format.  Imagers are encouraged to reduce their observations to equivalent visual magnitude (see Project Alcock ) and submit them in this format.  Do check the observation files (updated May 31) to see if what you sent matches what is there, as I still have to edit some of the submitted records, particularly the positioning of the DC, which should go in column 56, the position of "m" when tail length is given in minutes and the focal ratio.  If your observations are missing it may be because you have not used the correct format, which includes ICQ as a key.  If you use the Comet Observation Database to enter your observations they will be formatted correctly.

Details

15erobs.jpg (308854 bytes)15v2obs.jpg (308631 bytes)


Comet ephemerides (positions) etc

For positions of newly discovered comets see the NEO confirmation page . You can also generate your own ephemerides and elements at the CBAT Minor Planet and Comet Ephemeris Service web page.  The elements and ephemerides from the JPL Small-Body Database Browser give estimates of the errors, which are often far larger than might be thought from the accuracy of the elements given by the CBAT.  Seiichi Yoshida has pages for currently visible comets, which include finder charts. Seiichi also has a comet rendezvous page, which lists conjunctions between comets, variable stars and nebulae and a comet recovery page, which lists periodic comets not yet recovered at the present return. The T3 project aims to discover comets amongst the population of asteroids influenced by Jupiter. 

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. 

  • None at present

Planning aids and information for forthcoming comets

  • Comets reaching within three degrees of 180° opposition [updated 2013 December 31]
  • Comets reaching within three degrees of zero phase angle [updated 2013 December 31]

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. 

Finder charts

The BAA Computing Section has online charts for the comets listed here. There are daily finder charts for bright comets at Heavens Above. Reinder Bouma and Edwin van Dijk's astrosite Groningen has an excellent set of finder charts for brighter comets.

Orbits etc

The elements and ephemerides from the JPL Small-Body Database Browser give estimates of the errors, which are often far larger than might be thought from the accuracy of the elements given by the CBAT.   Full details of the latest orbits are available from Kazuo Kinoshita's Comet Orbit Home Page.  I compile orbital elements in Megastar format for: periodic comets , current comets , comets prior to 2005.  Most of the more recent elements include the latest magnitude parameters.  The elements are from a mix of CBAT catalogues, MPC, MPEC, JPL and individual orbit computers.

Downloads etc

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.


Upcoming comets

Predictions for the comets expected to return in 2016 , 2017 [updated 2017 January 1] , 2018 [updated 2017 June 27] and 2019 [updated 2017 June 27] are published in the BAA Journal in December each year. This list [Updated 2017 January 7] gives the period of visibility and maximum brightness for comets that are predicted to be visible within the next couple of years. A few are listed further into the future. Seiichi Yoshida also has a list of comets likely to be visible in the next five years.

Contributing observations

Observations may  be used in the reports on comets which appear on these pages, in The Comet's Tale and in the BAA Journal.

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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Comments and contact

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.


Published by jds@ast.cam.ac.uk