TABLE  twomass_sixx2_psc

This table contains brief descriptions of the parameters provided for each source in the TWOMASS Long Exposure (6x) Scan PSC. Required constraints: Primary key is (seqNum)

Name	Type	Length	Unit	Description	Default Value	Unified Content Descriptor
seqNum	int	4		Sequential number (unique object ID)
cx	float	8		unit vector of spherical co-ordinates		pos.distance;pos.cartesian.x
cy	float	8		unit vector of spherical co-ordinates		pos.distance;pos.cartesian.y
cz	float	8		unit vector of spherical co-ordinates		pos.distance;pos.cartesian.z
htmID	bigint	8		Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates		pos.eq
ra	float	8	deg	right ascension (J2000 decimal deg)
dec	float	8	deg	declination (J2000 decimal deg)
clon	varchar	16		The computed ra (J2000 EQ) of scan center in sexigesimal.
clat	varchar	16		The computed dec (J2000 EQ) of scan center in sexigesimal.
err_maj	real	4	arcsec	major axis of 1-sigma error ellipse
err_min	real	4	arcsec	minor axis of 1-sigma error ellipse
err_ang	smallint	2	deg	angle of error ellipse major axis (E of N)
j_m	real	4	mag	J selected "default" magnitude
j_msig	real	4	mag	J "default" mag uncertainty
j_msigcom	real	4	mag	combined (total) J band photometric uncertainty
j_snr	real	4		J band "scan" signal-to-noise ratio
h_m	real	4	mag	H selected "default" magnitude
h_msig	real	4	mag	H "default" mag uncertainty
h_msigcom	real	4	mag	combined (total) H band photometric uncertainty
h_snr	real	4		H band "scan" signal-to-noise ratio
k_m	real	4	mag	K selected "default" magnitude
k_msig	real	4	mag	K "default" mag uncertainty
k_msigcom	real	4	mag	combined (total) K band photometric uncertainty
k_snr	real	4		K band "scan" signal-to-noise ratio
rel	varchar	1		Reliability flag (A-F), with A being the highest and F being lowest reliability
ph_qual	varchar	3		flag indicating photometric quality of source
rd_flg	varchar	3		source of JHK "default" mags (AKA "read flag")
bl_flg	varchar	3		indicates # JHK components fit to source
cc_flg	varchar	3		indicates JHK artifact contamination and/or confusion
ndet	varchar	6		number of >3-sig. ap. mag measurements, # possible (jjhhkk)
gal_contam	smallint	2		src contaminated by galaxy (check blanked/subtracted tbl)
mp_flg	smallint	2		src is positionally associated with an asteroid, comet, etc
jdate	float	8	jdate	julian date of source measurement to +/- 30 sec
spos	smallint	2		# of scans in which src position falls inside coverage area
sdet	smallint	2		# of scans in which src was detected in >=1 band
gcntr	int	4		A unique identifier for the merged group of apparitions of this source
gcnf	smallint	2		Group confusion flag 0=not confused or single apparation, 1=confused
cat	smallint	2		Catalog indicator 1=catalog, 0=not catalog
j_h	real	4		The J-H color, computed from the J-band and H-band magnitudes (j_m and h_m, respectively) of the source. In cases where the first or second digit in rd_flg is equal to either "0", "4", "6", or "9", no color is computed because the photometry in one or both bands is of lower quality or the source is not detected.
h_k	real	4		The H-Ks color, computed from the H-band and Ks-band magnitudes (h_m and k_m, respectively) of the source. In cases where the second or third digit in rd_flg is equal to either "0", "4", "6", or "9", no color is computed because the photometry in one or both bands is of lower quality or the source is not detected.
j_k	real	4		The J-Ks color, computed from the J-band and Ks-band magnitudes (j_m and k_m, respectively) of the source. In cases where the first or third digit in rd_flg is equal to either "0", "4", "6", or "9", no color is computed because the photometry in one or both bands is of lower quality or the source is not detected.
Total length		197