TABLE  twomass_sixx2_scn

The following table contains brief descriptions of the parameters in the Scan Information Table, which provides basic data for each scan in the TWOMASS Long Exposure (6x) Scan Catalogue. Required constraints: Primary key is (cntr)

Name	Type	Length	Unit	Description	Default Value	Unified Content Descriptor
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
cntr	int	4		entry counter (key) number (unique within table)
hemis	varchar	1		hemisphere (N/S) of observation
date	datetime	8	yyyy-mm-dd	observation date
scan	smallint	2		scan number (unique within date)
tile	int	4		tile ID number
ra	float	8	deg	right ascension (J2000 decimal deg) of scan center
dec	float	8	deg	declination (J2000 decimal deg) of scan center
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.
glon	float	8	deg	galactic longitude (decimal deg) of scan center
glat	float	8	deg	galactic latitude (decimal deg) of scan center
ra_1	float	8	deg	right ascension (J2000 decimal deg) of scan corner 1
dec_1	float	8	deg	declination (J2000 decimal deg) of scan corner 1
ra_2	float	8	deg	right ascension (J2000 decimal deg) of scan corner 2
dec_2	float	8	deg	declination (J2000 decimal deg) of scan corner 2
ra_3	float	8	deg	right ascension (J2000 decimal deg) of scan corner 3
dec_3	float	8	deg	declination (J2000 decimal deg) of scan corner 3
ra_4	float	8	deg	right ascension (J2000 decimal deg) of scan corner 4
dec_4	float	8	deg	declination (J2000 decimal deg) of scan corner 4
sd	varchar	1		direction of scan -- north/south-bound (n/s)
qual	smallint	2		quality score for scan (0-10)
hgl	smallint	2		single-frame H-band glitch flag (0:not found|1:found)
cld	smallint	2		downgrade from DB photom. overlap comparison (clouds) (0|1)
xph	smallint	2		downgrade from DB photom. overlap compar. (non-cloud) (0|1)
anom	smallint	2		entry in coadd anomaly table (0:not found|1:found)
ut	float	8	hrs	beginning UT of scan data
jdate	float	8	jdate	Julian date beginning UT of scan data
airm	real	4		beginning airmass of scan
zd	real	4	deg	beginning zenith distance of scan data
ha	float	8	hr	beginning hour angle of scan data
rh	smallint	2	%	relative humidity (%) at beginning of scan
air_temp	real	4	degC	air temperature (deg C) at beginning of scan
tel_temp	real	4	degC	telescope tube girdle temperature (deg C) at beg. of scan
focus	smallint	2		telescope focus setting
hry	smallint	2		H-band detector array switched, north only (0=old, 1=new)
c_strat	smallint	2		calibration strategy, north only (0=old, 1=new)
j_zp_ap	real	4	mag	J band ap. calibration photometric zero-point for scan
h_zp_ap	real	4	mag	H band ap. calibration photometric zero-point for scan
k_zp_ap	real	4	mag	K band ap. calibration photometric zero-point for scan
h_zperr_ap	real	4	mag	H band ap. calibration rms error of zero-point for scan
k_zperr_ap	real	4	mag	K band ap. calibration rms error of zero-point for scan
j_n_snr10	int	4		number of J point sources with SNR>10 (instrumental m<=15.8)
h_n_snr10	int	4		number of H point sources with SNR>10 (instrumental m<=15.1)
k_n_snr10	int	4		number of K point sources with SNR>10 (instrumental m<=14.3)
n_ext	int	4		number of regular extended sources detected in scan
j_shape_avg	real	4		J band average seeing shape for scan
h_shape_avg	real	4		H band average seeing shape for scan
k_shape_avg	real	4		K band average seeing shape for scan
j_shape_rms	real	4		rms of J band avg seeing shape for scan
h_shape_rms	real	4		rms of H band avg seeing shape for scan
k_shape_rms	real	4		rms of K band avg seeing shape for scan
j_2mrat	real	4		J band average 2nd image moment ratio for scan
h_2mrat	real	4		H band average 2nd image moment ratio for scan
k_2mrat	real	4		K band average 2nd image moment ratio for scan
j_psp	real	4		J photometric sensitivity param: j_shape_avg*(j_fbg_avg^.29)
h_psp	real	4		H photometric sensitivity param: h_shape_avg*(h_fbg_avg^.29)
k_psp	real	4		K photometric sensitivity param: k_shape_avg*(k_fbg_avg^.29)
j_pts_noise	real	4	logmJy	log10 of J band modal point src noise estimate
h_pts_noise	real	4	logmJy	log10 of H band modal point src noise estimate
k_pts_noise	real	4	logmJy	log10 of K band modal point src noise estimate
j_msnr10	real	4	mag	J mag at which SNR=10 is achieved, from j_psp and j_zp_ap
h_msnr10	real	4	mag	H mag at which SNR=10 is achieved, from h_psp and h_zp_ap
k_msnr10	real	4	mag	K mag at which SNR=10 is achieved, from k_psp and k_zp_ap
cat	smallint	2		Catalog indicator 1=catalog, 0=not catalog
Total length		348