Chart 25 C/2017 K2 (PANSTARRS) period 6 January - 12 January 2023The 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:
C/2017 K2 (PANSTARRS)
C/2022 E3 (ZTF)
see below...
C/2017 K2 (PANSTARRS)
Chart 25 C/2017 K2 (PANSTARRS) period 6 January - 12 January 2023
Chart 26 C/2017 K2 (PANSTARRS) period 12 January - 17 January 2023
Chart 27 C/2017 K2 (PANSTARRS) period 17 January - 22 January 2023
Chart 28 C/2017 K2 (PANSTARRS) period 22 January - 27 January 2023
Chart 29 C/2017 K2 (PANSTARRS) period 27 January - 1 February 2023
Chart 30 C/2017 K2 (PANSTARRS) period 1 February - 6 February 2023
Chart 31 C/2017 K2 (PANSTARRS) period 6 February - 12 February 2023
Chart 32 C/2017 K2 (PANSTARRS) period 12 February - 19 February 2023
Chart 33 C/2017 K2 (PANSTARRS) period 19 February - 26 February 2023
Chart 34 C/2017 K2 (PANSTARRS) period 26 February - 4 March 2023
Chart 35 C/2017 K2 (PANSTARRS) period 4 March - 11 March 2023
Chart 36 C/2017 K2 (PANSTARRS) period 11 March - 18 March 2023
Chart 37 C/2017 K2 (PANSTARRS) period 18 March - 25 March 2023
Chart 38 C/2017 K2 (PANSTARRS) period 25 March - 1 April 2023
Chart 39 C/2017 K2 (PANSTARRS) period 8 April - 13 April 2023
Chart 40 C/2017 K2 (PANSTARRS) period 13 April - 19 April 2023
Chart 41 C/2017 K2 (PANSTARRS) period 19 April - 25 April 2023
C/2022 E3 (ZTF)
Chart 1 C/2022 E3 (ZTF) period 8 November - 14 December 2022
Chart 2 C/2022 E3 (ZTF) period 14 December - 26 December 2022
Chart 3 C/2022 E3 (ZTF) period 26 December 2022 - 2 January 2023
Chart 4 C/2022 E3 (ZTF) period 2 January - 11 January 2023
Chart 5 C/2022 E3 (ZTF) period 11 January - 18 January 2023
Chart 6 C/2022 E3 (ZTF) period 18 January - 25 January 2023
Chart 7 C/2022 E3 (ZTF) period 25 January - 29 January 2023
Chart 8 C/2022 E3 (ZTF) period 29 January -2 February 2023
Chart 9 C/2022 E3 (ZTF) period 2 February -5 February 2023
Chart 10 C/2022 E3 (ZTF) period 5 February -8 February 2023
Chart 11 C/2022 E3 (ZTF) period 8 February -13 February 2023
Chart 12 C/2022 E3 (ZTF) period 13 February -18 February 2023
Chart 13 C/2022 E3 (ZTF) period 18 February -28 February 2023
Chart 14 C/2022 E3 (ZTF) period 28 February -9 March 2023
Chart 15 C/2022 E3 (ZTF) period 9 March - 19 March 2023
Chart 16 C/2022 E3 (ZTF) period 19 March - 4 April 2023