GSC I Properties

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Last Updated Jan 2001

Copyright © 2001 The Association of Universities for Research in Astronomy, Inc. All Rights Reserved.

Quick Fact Sheet on GSC 1.1

Total Objects
> 18 million
Sky Coverage
All sky
Magnitude limit
15.5
Complete to magnitude limit
No
Source for bright stars
Hipparchos Input Catalog
Bandpass: North
Photographic V
Bandpass: South
Photographic J
Digitization resolution
1.7 arcsec
Astrometry:
FK4
Reference catalogs

AGK3, SAO
Projection
Gnomonic
Systematic error correction
None
Positional errors

Depends on the location of the image on the Schmidt plate:

0.2 acrcseconds (near the plate center)
to
1.0 arcsecond (near the plate edges)

Photometry:

Model: Chebyshev polynomiaL
Method: Least squares of of model using GSCP I
Reference catalogs
GSPC 1: 6 calibrators per plate
Magnitude errors

Overall quality: 0.15 mag

Average over all plate for objects far from the photometric calibrators: 0.3 mag