Last Updated Jan 2001
Copyright
© 2001 The Association of Universities for Research in Astronomy, Inc.
All Rights Reserved.
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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
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Astrometry: |
FK4
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Reference catalogs |
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Projection |
Gnomonic
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Systematic error correction |
None
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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)
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Photometry: |
Model: Chebyshev polynomiaL
Method: Least squares of of model using GSCP I
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Reference catalogs |
GSPC 1: 6 calibrators per plate
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Magnitude errors |
Overall quality: 0.15 mag
Average over all plate for objects far from the photometric
calibrators: 0.3 mag
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