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)

FlagPossible Flag Values
1Number 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
3Centroider type associated with the exported position
  • 0 = Barycenter
  • 1 = Circular Gaussian
  • 2 = Elliptical Gaussian
  • 3 = FPA-applied barycenter
  • 4 = multicircular
  • 5 = multielliptical
  • 6 = FPA + circular
  • 7 = FPA + elliptical
Digit from rightFlagPossible Flag Values
0123
4

Quality of exported J magnitude

not present

fitextrapolated-
5

Quality of exported F magnitude

not present

fitextrapolated-
6

Quality of exported V magnitude

not present

fitextrapolated-
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)


Example1098765432+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

1500Source was added from GAIA
77777700 Source added from 2MASS (GSC 2.3-2.4.0)
900Source added from 2MASS (GSC 2.4.1 and later)



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