* * * * * COMET CHARTS * * * * *

The aim of this service is to provide charts (using Guide 9.0) and suitable comparison stars for relatively bright comets,
i.e. brighter than magnitude 10-11, to aid observers in making brightness estimates.
To avoid confusion with Flamsteed numbers we have underlined the magnitudes of all comparison stars.
Stars with B-V<1.0 were selected where possible; those with B-V>1.0 are given in italics, and should only
be used when no suitable alternatives are available.
The source of the comparison stars on these standard charts is primarily the Tycho-2 catalog, of which only VT-magnitudes
are used. When reporting data to the ICQ (International Comet Quarterly) the source code thus should be given as TK,
unless indicated otherwise.

We plan to issue new charts on a regular basis, if possible not later than 2 days before the date of first observation.

Occasionally we also issue special charts for fainter comets that are of particular interest.
Below magnitude 10-11 comparison stars usually are taken from a different source (such as APASS with ICQ code AQ,
ASAS-3 with ICQ code AU and TASS4 with ICQ code TA), because Tycho-2 is becoming very unreliable here.
It should be noted also that the ICQ advises against the use of Tycho-2 for comets fainter than magnitude 10.5.
So be sure to always check the proper code(s) given on the top right corner of the chart.

If you wish to be informed about the issue of new charts you can subscribe to our charts-info service.
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Currently we have charts available for:

 

C/2016 M1 (PANSTARRS)
C/2017 S3 (PANSTARRS)
C/2017 T3 (ATLAS)
21P/Giacobini-Zinner


see below...

 

C/2016 M1 (PANSTARRS)

Chart 1 C/2016 M1 (PANSTARRS) period 12 May - 18 Mayt 2018

Chart 2 C/2016 M1 (PANSTARRS)1 period 18 May - 23 May 2018

Chart 3 C/2016 M1 (PANSTARRS) period 23 May - 28 May 2018

Chart 4 C/2016 M1 (PANSTARRS) period 4 June - 9 June 2018

Chart 5 C/2016 M1 (PANSTARRS) period 9 June - 14 June 2018

Chart 6 C/2016 M1 (PANSTARRS) period 14 June - 19 June 2018

Chart 7 C/2016 M1 (PANSTARRS) period 19 June - 24 June 2018

Chart 8 C/2016 M1 (PANSTARRS) period 30 June - 7 July 2018

Chart 9 C/2016 M1 (PANSTARRS) period 7 July - 14 July 2018

Chart 10 C/2016 M1 (PANSTARRS) period 14 July - 22 July 2018

Chart 11 C/2016 M1 (PANSTARRS) period 22 July - 2 August 2018

Chart 12 C/2016 M1 (PANSTARRS) period 8 August - 24 August 2018

C/2017 S3 (PANSTARRS)

Chart 1 C/2017 S3 (PANSTARRS) period 18 July - 24 July 2018

 

C/2017 T3 (ATLAS)

Chart 1 C/2017 T3 (ATLAS) period 11 July - 15 July 2018

Chart 2 C/2017 T3 (ATLAS) period 15 July - 19 July 2018

Chart 3 C/2017 T3 (ATLAS) period 19 July - 23 July 2018

Chart 4 C/2017 T3 (ATLAS) period 23 July - 26 July 2018

21P/Giacobini-Zinner

Chart 1 21P/Giacobini-Zinnerperiod 14 July - 19 July 2018

Chart 2 21P/Giacobini-Zinner period 19 July - 24 July 2018

Chart 3 21P/Giacobini-Zinner period 24 July - 31 July 2018

Chart 4 21P/Giacobini-Zinner period 31 July - 6 August 2018

Chart 5 21P/Giacobini-Zinner period 6 August - 13 August 2018

Chart 6 21P/Giacobini-Zinner period 13 August - 19 August 2018

Chart 7 21P/Giacobini-Zinner period 19 August - 25 August 2018