Guide to object catalogue data

The extraction form can return a catalogue containing either all the parameters or a useful subset. The subset should satisfy most users requirements.

Apart from the magnitudes in other wavebands and the proper motion all parameters are derived from the measurement of the plate in the primary waveband selected on the form.

A secondary magnitude of 99.999 indicates one of the following:

• the plate in the seondary waveband does not exist or has not been measured, if this is the case all objects in this waveband for a given field will be entered as 99.999
• the object is too faint or has a colour that prevents it from being detected on the secondary plate
  
• proper motion/pairing problems

Updates to the on-line data and associated access software are listed in the Release History.

Listings of the parameters returned by the "subset" and "full" options are given below.

• Description of subset parameters
• Description of full parameters

Parameters returned if "subset" selected

No.	Name	Type	Description	Units
1	RA	Double	Celestial Right Ascension	radians (FITS), hms (ASCII) or degrees (tab)
2	DEC	Double	Celestial Declination	radians (FITS), dms (ASCII) or degrees (tab)
3	EPOCH	Real	Epoch	year
4	MU_ACOSD	Real	Proper motion in RA	mas/yr
5	MU_D	Real	Proper motion in Dec	mas/yr
6	SIGMU_A	Real	Error on proper motion in RA	mas/yr
7	SIGMU_D	Real	Error on proper motion in Dec	mas/yr
8	B_J	Real	UK-J (Bj) magnitude	mags
9	R_1	Real	ESO-R or POSS-I E magnitude	mags
10	R_2	Real	UK-R magnitude	mags
11	I	Real	UK-I magnitude	mags
12	AREA	Integer	Total area	0.7 arsec pixels
13	A_I	Integer	Weighted semi-major axis	0.01 microns (FITS/Tab) or milli-arcsec (ASCII)
14	B_I	Integer	Weighted semi-minor axis	0.01 microns FITS/Tab or milli-arcsec (ASCII)
15	P_A	Integer	Celestial position angle	degrees
16	CLASS	Integer	Classification flag
17	N(0,1)	Real	N(0,1) profile classification statistic	sigma
18	BLEND	Integer	Deblending flag (0 if not deblended)
19	QUALITY	Integer	Quality flag
20	FIELD	Integer	Schmdit field number

Parameters returned if "all" selected

No.	Name	Type	Description	Units
1	RA	Double	Celestial Right Ascension	radians (FITS), hms (ASCII) or degrees (tab)
2	DEC	Double	Celestial Declination	radians (FITS), dms (ASCII) or degrees (tab)
3	EPOCH	Real	Epoch	year
4	MU_ACOSD	Real	Proper motion in RA	mas/yr
5	MU_D	Real	Proper motion in Dec	mas/yr
6	SIGMU_A	Real	Error on proper motion in RA	mas/yr
7	SIGMU_D	Real	Error on proper motion in Dec	mas/yr
8	B_J	Real	UK-J (Bj) magnitude	mags
9	R_1	Real	ESO-R or POSS-I E magnitude	mags
10	R_2	Real	UK-R magnitude	mags
11	I	Real	UK-I magnitude	mags
12	AREA	Integer	Total area	0.7 arsec pixels
13	A_I	Integer	Weighted semi-major axis	0.01 microns (FITS/Tab) or milli-arcsec (ASCII)
14	B_I	Integer	Weighted semi-minor axis	0.01 microns FITS/Tab or milli-arcsec (ASCII)
15	P_A	Integer	Celestial position angle	degrees
16	CLASS	Integer	Classification flag
17	N(0,1)	Real	N(0,1) profile classification statistic	sigma
18	BLEND	Integer	Deblending flag (0 if not deblended)
19	QUALITY	Integer	Quality flag
20	FIELD	Integer	Schmdit field number
21	XMIN	Integer	Left extent	0.01 microns
22	XMAX	Integer	Right extent	0.01 microns
23	YMIN	Integer	Bottom extent	0.01 microns
24	YMAX	Integer	Top extent	0.01 microns
25	IPEAK	Integer	Brightest intensity above sky
26	MAG	Real	COSMOS magnitude	magnitudes
27	ISKY	Integer	Sky intensity at XCEN_I, YCEN_I
28	XCEN_I	Integer	Intensity weighted X centroid	0.01 microns
29	YCEN_I	Integer	Intensity weighted Y centroid	0.01 microns
30	A_U	Integer	Unweighted semi-major axis	0.01 microns
31	B_U	Integer	Unweighted semi-minor axis	0.01 microns
32	THETA_U	Integer	Unweighted orientation	degrees
33	THETA_I	Integer	Weighted orientation	degrees
34	AP(1)	Integer	Area above areal profile level 1	pixels
35	AP(2)	Integer	Area above areal profile level 2	pixels
36	AP(3)	Integer	Area above areal profile level 3	pixels
37	AP(4)	Integer	Area above areal profile level 4	pixels
38	AP(5)	Integer	Area above areal profile level 5	pixels
39	AP(6)	Integer	Area above areal profile level 6	pixels
40	AP(7)	Integer	Area above areal profile level 7	pixels
41	AP(8)	Integer	Area above areal profile level 8	pixels
42	PRFMAG	Integer	SuperCOSMOS profile magnitude	millimags