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2 members, 3 messages added in the last 7 days
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  • Re: Limited star magnitude in M42

    Because the nebula hide the faint stars in this area. You can use an infrared catalog to look behind the nebula. See this example using 2MASS as a VO catalog:

    pchevalley 3 days ago
  • Re: Limited star magnitude in M42

    I am guessing this is because most non-visual star catalogues have trouble with the sky background (among other things to do with the way the ISM scrambles

    3 days ago
  • Limited star magnitude in M42

    Even though star to magnitude ~12.5 show up it appears the area surrounding Theta Ori (in M42) never show anything beyond mag 10.5. I know there are stars of

    marty_0750 4 days ago
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Group Description

This group is a complement to the "skychart" group to allow discussion between user of the Cartes du Ciel / Sky Charts software.

All subject in relation with the usage of this software is welcome.

The preferred language is English.



Many question are already solved here! Please check the message archives before asking.




WHEN ASKING QUESTIONS, PLEASE SPECIFY WHICH VERSION YOU'RE USING. THE NEW v.3 BETA HAS MANY CHANGES FROM v.2.7x.

Group Information

  • 1663
  • Astronomy
  • Dec 16, 1999
  • English

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