Chart 23 12P/Pons-Brooks period 6 July - 14 July 2024The 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.
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Currently we have charts available for:
12P/Pons-Brooks
13P/Olbers
C/2023 A3 (Tsuchinshan-ATLAS)
see below...
12P/Pons-Brooks
Chart 23 12P/Pons-Brooks period 6 July - 14 July 2024
Chart 24 12P/Pons-Brooks period 14 July - 20 July 2024
Chart 25 12P/Pons-Brooks period 20 July - 26 July 2024
Chart 26 12P/Pons-Brooks period 26 July - 1 August 2024
Chart 27 12P/Pons-Brooks period 1 August - 8 August 2024
13P/Olbers
Chart 1 13P/Olbers period 26 April - 2 May 2024
Chart 2 13P/Olbers period 2 May - 8 May 2024
Chart 3 13P/Olbers period 8 May - 14 May 2024
Chart 4 13P/Olbers period 14 May - 20 May 2024
Chart 5 13P/Olbers period 20 May - 25 May 2024
Chart 6 13P/Olbers period 25 May - 1 June 2024
Chart 7 13P/Olbers period 1 June - 8 June 2024
Chart 8 13P/Olbers period 8 June - 14 June 2024
Chart 9 13P/Olbers period 14 June - 20 June 2024
Chart 10 13P/Olbers period 20 June - 26 June 2024
Chart 11 13P/Olbers period 26 June - 3 July 2024
Chart 12 13P/Olbers period 3 July - 10 July 2024
Chart 13 13P/Olbers period 10 July - 17 July 2024
Chart 14 13P/Olbers period 17 July - 24 July 2024
Chart 15 13P/Olbers period 24 July - 31 July 2024
Chart 16 13P/Olbers period 31 July - 8 August 2024
C/2023 A3 (Tsuchinshan-ATLAS)
Chart 1 C/2023 A3 (Tsuchinshan-ATLAS) period 21 June - 5 July 2024
Chart 2 C/2023 A3 (Tsuchinshan-ATLAS) period 5 July - 29 July 2024