TABLE twomass_sixx2_psc

Contains the parameters provided for each source in the TWOMASS Long Exposure (6x) Scan 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_EQ_X

cy float 8 unit vector of spherical co-ordinates POS_EQ_Y

cz float 8 unit vector of spherical co-ordinates POS_EQ_Z

htmID bigint 8 Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates POS_GENERAL

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

Name	Type	Length	Unit	Description	Unified Content Descriptor
seqNum	int	4		Sequential number (unique object ID)
cx	float	8		unit vector of spherical co-ordinates	POS_EQ_X
cy	float	8		unit vector of spherical co-ordinates	POS_EQ_Y
cz	float	8		unit vector of spherical co-ordinates	POS_EQ_Z
htmID	bigint	8		Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates	POS_GENERAL
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