* * * * * 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/2018 V1 (Machholz-Fujikawa-Iwamoto)
38P/Stephan-Oterma
46P/Wirtanen
64P/Swift-Gehrels


see below...

C/2018 V1 (Machholz-Fujikawa-Iwamoto)

Chart 1 C/2018 V1 (Machholz-Fujikawa-Iwamoto) period 12 November - 16 November 2018

Chart 2 C/2018 V1 (Machholz-Fujikawa-Iwamoto) period 16 November - 20 November 2018

38P/Stephan-Oterma

Chart 1 38P/Stephan-Oterma period 1 November - 8 November 2018

Chart 2 38P/Stephan-Oterma period 8 November - 16 November 2018

Chart 3 38P/Stephan-Oterma period 16 November - 23 November 2018

Chart 4 38P/Stephan-Oterma period 20 November - 7 December 2018

Chart 5 38P/Stephan-Oterma period 7 December - 14 December 2018

Chart 6 38P/Stephan-Oterma period 14 December - 21 December 2018

46P/Wirtanen

Chart 1 46P/Wirtanen period 25 bOctober - 20 November 2018

Chart 2 46P/Wirtanen period 17 November - 29 November 2018

Chart 3 46P/Wirtanen period 29 November - 9 December 2018

Chart 4 46P/Wirtanen period 9 December - 15 December 2018

Chart 5 46P/Wirtanen period 15 December - 20 December 2018

Chart 6 46P/Wirtanen period 20 December - 28 December 2018

Chart 7 46P/Wirtanen period 28 December 2018- 8 January 2019

64P/Swift-Gehrels

Chart 1 64P/Swift-Gehrels period 26 October - 10 November 2018

Chart 2 64P/Swift-Gehrels period 10 November - 20 November 2018

Chart 3 64P/Swift-Gehrels period 26 November - 4 December 2018

Chart 4 64P/Swift-Gehrels period 4 December - 12 December 2018

Chart 5 64P/Swift-Gehrels period 12 December - 19 December 2018