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Cumulative histogram, normalized to total number of GSC241 sources
Astrometry comparison 2MASS
A comparison of GSC2 coordinates against 2MASS.
Not only does GSC241 alleviate the systematic hemisphere error (see, eg, Lasker et al. 2008), it also improves uncertainties by about a factor of 2.
These RA/Dec difference plots and statistics are from the averages of the differences for each level 10 HTM trixels (~0.015 square degrees).
In the scatter plots of ra/dec differences vs ra/dec/glon/glat, the orange line is the average across 5-degree cuts along the abscissa.
| GSC23 | GSC241 |
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RA difference: Dec difference: 0.056 +/- 0.131 |
RA difference: Dec difference: -0.057 +/- 0.076 |
| Comparisons in Equatorial coordinates | |
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| Comparisons in Galactic coordinates | |
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