British Astronomical Association

Comet Section

Director: Nick James

Visual observations page


(Co-ordinator Jonathan Shanklin)

Latest Discoveries

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.


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 2016 News / Comet discovery procedure / Weather information / The Comet's Tale / BAA Comet Section image archive / Project Alcock / More information / Legacy page

Current comet magnitudes (January 1) and observable region (January 11)

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 observed
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. Comet predictions for 2019 published.
  2. 45P/Honda-Mrkos-Pajdusakova has brightened rapidly.  For UK observers there is a brief window of opportunity in the early evening sky for a few more days, although the comet is quite low.  After solar conjunction at the end of January it emerges into the morning sky and makes a close pass to the Earth, when it should be 7th magnitude.  It then fades rapidly as it moves into the evening sky.
  3. 2015 ER61 is emerging from solar conjunction and Juan Gonzalez recovered it on December 6.25 at 10.5.  The light curve remains very uncertain, however the comet is brightening rapidly and it should soon be in binocular range.  It could reach 4th magnitude (3 magnitudes) around the time of perihelion in 2017 May.  It is a morning object when at its best and doesn't get into the evening sky until it is fading in 2017 August.
  4. 2015 V2 is currently brightening relatively slowly, with electronic VEM observations rather fainter than the visual ones.  It could reach binocular visibility in March and might reach 6th magnitude.  It will become visible in the late evening, but is highest in the morning skies.
  5. 2016 U1 should continue to brighten quite rapidly, though it remains a morning object.  It might reach 6th magnitude, but is then in solar conjunction.
  6. 2P/Encke and 41P/Tuttle-Giacobini-Kresak should be brightening to within visual range.
  7. 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 will include a paper on "The brighter comets of 2009".  Further papers in this series are in press or in draft.
  8. 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 January 1) 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 (336493 bytes)15v2obs.jpg (319604 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.

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 January 1] and 2019 [new 2017 January 7] 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.

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.


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