Seeing and sky brightness
Seeing and sky brightness affect both the completeness of the SDSS and the accuracy
of its star/galaxy separation. Seeing is defined here as the effective width of the point
spread function (see section 4.3 of the EDR
paper). The following plots show the fraction of DR1 fields
exceeding a given seeing and sky brightness.
| Seeing | Sky brightness |
|---|
 |
 |
These are the r-band quartiles:
| Parameter |
Lower quartile |
Median |
Upper quartile |
| PSF width |
1.58" |
1.43" |
1.30" |
| Sky brightness |
20.70 mag |
20.86 mag |
21.03 mag |
Last modified: Tue Feb 17 18:41:43 CST 2004
|
