* * * * * 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.
Send us a message with in the body 'subscribe charts-info' and your email address, by clicking here.

Your email address will only be used to send you our charts-info, and it will not be made available to other persons.
Please, make sure that your email settings/SPAM filters are allowing our messages to get through.
If they bounce repeatedly, for whatever reason, your address will be removed from our mailing list.


Currently we have charts available for:

12P/Pons-Brooks
62P/Tsuchinshan 1

C/2021 S3 (PANSTARRS)


see below...

12P/Pons-Brooks

Chart 1 12P/Pons-Brooks period 30 November - 10 December 2023

Chart 2 12P/Pons-Brooks period 10 December - 18 December 2023

Chart 3 12P/Pons-Brooks period 18 December - 26 December 2023

Chart 4 12P/Pons-Brooks period 26 December 2023 - 3 Janurary 2024

Chart 5 12P/Pons-Brooks period 3 Janurary - 9 January 2024

Chart 6 12P/Pons-Brooks period 9 Janurary - 15 January 2024

Chart 7 12P/Pons-Brooks period 15 Janurary - 20 January 2024

Chart 8 12P/Pons-Brooks period 20 Janurary - 25 January 2024

Chart 9 12P/Pons-Brooks period 25 Janurary - 1 February 2024

Chart 10 12P/Pons-Brooks period 1 February - 8 February 2024

Chart 11 12P/Pons-Brooks period 8 February - 14 February 2024

Chart 12 12P/Pons-Brooks period 14 February - 20 February 2024

Chart 13 12P/Pons-Brooks period 20 February - 26 February 2024

Chart 14 12P/Pons-Brooks period 26 February - 11 March 2024

Chart 15 12P/Pons-Brooks period 11 March - 25 March 2024

62P/Tsuchinshan 1

Chart 1 62P/Tsuchinshan 1 period 6 December - 10 December 2023

Chart 2 62P/Tsuchinshan 1 period 10 December - 14 December 2023

Chart 3 62P/Tsuchinshan 1 period 14 December - 18 December 2023

Chart 4 62P/Tsuchinshan 1 period 18 December - 22 December 2023

Chart 5 62P/Tsuchinshan 1 period 22 December - 26 December 2023

Chart 6 62P/Tsuchinshan 1 period 4 January - 13 January 2024

Chart 7 62P/Tsuchinshan 1 period 13 January - 25 January 2024

Chart 8 62P/Tsuchinshan 1 period 30 January - 8 March 2024

C/2021 S3 (PANSTARRS)

Chart 1 C/2021 S3 (PANSTARRS) period 5 March - 9 March 2024

Chart 2 C/2021 S3 (PANSTARRS) period 9 March - 13 March 2024

Chart 3 C/2021 S3 (PANSTARRS) period 13 March - 17 March 2024

Chart 4 C/2021 S3 (PANSTARRS) period 17 March - 21 March 2024

Chart 5 C/2021 S3 (PANSTARRS) period 21 March - 25 March 2024