![]() For photometry purpose, C2A natively integrates the Loneos catalogue ( UBVRI photometry of faint field stars, which is part of the standard distribution package). ![]() C2A is also an easy to use general purpose Planetarium software with many functions.Ĭ2A is able to display the following catalogues: SAO, GCVS, WDS, Gliese and Hipparcos (all four provided with the standard program distribution), Guide Star, Tycho-2 (both can be downloaded from this site in the Downloads page), USNO-SA1.0, USNO-A2.0, USNO-B1.0, UCAC1, UCAC2, UCAC3, UCAC4, NOMAD, PPMXL, CMC15 and URAT1 (which are not provided with the distribution because of their size). An important objective of this software is to take into account the main catalogues available to professional and amateur astronomers in order to prepare observations on small fields as well as astrometry and photometry works. It is only available for the Microsoft Windows Operating System (all versions). C2A ( Computer Aided Astronomy) is a Planetarium software that allows you to build detailed views of stellar fields.
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