This field in the GSC 2.x record was designed to hold various data flags during photographic plate processing. It was later supplemented to indicate the addition of objects from more modern CCD surveys.
SourceStatus Codes for GSC 2.x
The sourceStatus field is a 10-digit number to encode plate processing information, but has been augmented to show the original catalog if it did not come from a plate observation.
Digit (counting from right) | Flag | Possible Flag Values | |||
---|---|---|---|---|---|
1 | Number of plates on which this object appeared. | A "00" may include plate observations that were excluded from the GSC2.3. These two digits are read together as an ordinary base ten number, eg, 04 or 12. | |||
2 | |||||
3 | Centroider type associated with the exported position |
| |||
Digit from right | Flag | Possible Flag Values | |||
0 | 1 | 2 | 3 | ||
4 | Quality of exported J magnitude | not present | fit | extrapolated | - |
5 | Quality of exported F magnitude | not present | fit | extrapolated | - |
6 | Quality of exported V magnitude | not present | fit | extrapolated | - |
7 | Classification unanimity | mixed vote | unanimous vote | unanimous defect | - |
8 | Classification voters | More than one 15um scan | One 15um scan | More than one 25um scan | One 25um scan |
9 | Incomplete processing | Completed processing on all plates | Object was too big to be cut out (> 256x256 pixels) on at least one plate | - | - |
10 | Deblended object | Single object on all plates | Child (deblended) object on at least one plate | - | - |
Other Codes
GSC 2.4.0 and earlier : 99999900 = TYCHO; 88888800 = Sky2000; 77777700 = 2MASS
GSC 2.4.1 and later : Sources from Catalogs have source code x 100 as sourceStatus (e.g. sdss = 1700)
Example | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2+1 |
---|---|---|---|---|---|---|---|---|---|
1101011508 | 1 Deblended object | 1 Object too large | 0 Multiple classification votes | 1 Unanimous vote | 0 Vpg not measured | 1 Fpg fitted | 1 Jpg fitted | 5 Multi-object elliptical fit | 08 Appeared on 8 plates |
1022202 | 1 Unanimous vote | 0 Vpg not measured | 2 Fpg extrapolated | 2 Jpg extrapolated | 2 Elliptical fit | 02 Appeared on 2 plates | |||
1011206 | 1 Unanimous vote | 0 Vpg not measured | 1 Fpg fitted | 1 Jpg fitted | 2 Elliptical fit | 06 Appeared on 6 plate | |||
1500 | Source was added from GAIA | ||||||||
77777700 | Source added from 2MASS (GSC 2.3-2.4.0) | ||||||||
900 | Source added from 2MASS (GSC 2.4.1 and later) |