| Contains the parameters in the Scan Information Table. |
| The following table contains brief descriptions of the parameters in the Scan Information Table, which provides basic data for each scan in the TWOMASS All Sky Release. The table is organized according to the broad function and utility of the parameters: positional information, photometric information, source detection statistics, etc. Required constraints:
|
| 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 | ||
| scan_key | int | 4 | the unique identification number for this scan. | meta.id | ||
| hemis | varchar | 1 | Observatory from which data were obtained: "n" = north = Mt. Hopkins, "s" = south = Cerro Tololo. | meta.code;obs | ||
| date | datetime | 8 | yyyy-mm-dd | The observation reference date for this scan expressed in ISO standard format. (YYYY-MM-DD) | time.epoch | |
| scan | smallint | 2 | Scan number (unique within date). | meta.number | ||
| tile | int | 4 | Tile identification number. | meta.id | ||
| ra | float | 8 | degrees | Right ascension of scan center for equinox J2000. | pos.eq.ra;meta.main | |
| dec | float | 8 | degrees | Declination of scan center for equinox J2000. | pos.eq.dec;meta.main | |
| glon | real | 4 | degrees | Galactic longitude of scan center, as computed from ra and dec above. | pos.galactic.lon | |
| glat | real | 4 | degrees | Galactic latitude of scan center, as computed from ra and dec above. | pos.galactic.lat | |
| ra_1 | float | 8 | degrees | J2000 right ascension of the eastern corner at start of scan. | pos.eq.ra;meta.main | |
| dec_1 | float | 8 | degrees | J2000 declination of the eastern corner at start of scan. | pos.eq.dec;meta.main | |
| ra_2 | float | 8 | degrees | J2000 right ascension of the western corner at start of scan. | pos.eq.ra;meta.main | |
| dec_2 | float | 8 | degrees | J2000 declination of the western corner at start of scan. | pos.eq.dec;meta.main | |
| ra_3 | float | 8 | degrees | J2000 right ascension of the eastern corner at end of scan. | pos.eq.ra;meta.main | |
| dec_3 | float | 8 | degrees | J2000 declination of the eastern corner at end of scan. | pos.eq.dec;meta.main | |
| ra_4 | float | 8 | degrees | J2000 right ascension of the western corner at end of scan. | pos.eq.ra;meta.main | |
| dec_4 | float | 8 | degrees | J2000 declination of the western corner at end of scan. | pos.eq.dec;meta.main | |
| sd | varchar | 1 | Scanning direction: "n" = north-going, "s" = south-going. | pos.posAng | ||
| qual | smallint | 2 | Quality score for scan. | meta.code | ||
| hgl | smallint | 2 | Special flag indicating whether or not this scan has a single-frame H-band electronic glitch. | meta.code | ||
| cld | smallint | 2 | Special flag indicating whether or not a cloud was found in the scan after comparison of its photometry to that of overlapping scans in the database. | meta.code | ||
| xph | smallint | 2 | Special flag indicating whether or not another photometric problem, not obviously cloud related, was found in the scan after comparing its photometry to that of overlapping scans. | meta.code | ||
| anom | smallint | 2 | Special flag indicating whether or not an unusual problem was found in the Atlas Images for this scan. | meta.code | ||
| ut | float | 8 | hr | Universal Time (UT) at beginning of scan. | time.epoch | |
| jdate | float | 8 | Julian days | Julian Date at beginning of scan. | time.epoch | |
| airm | real | 4 | Airmass at beginning of scan. | obs.airMass | ||
| zd | real | 4 | degrees | Scan's distance from the zenith at beginning of scan. | stat.fit.residual;pos.az.zd | |
| ha | float | 8 | hr | Hour angle at beginning of scan. | pos.posAng | |
| rh | smallint | 2 | % | Relative humidity of telescope enclosure at beginning of scan. | meta.note;obs | |
| air_temp | real | 4 | degC | Air temperature at beginning of scan. | phys.temperature | |
| tel_temp | real | 4 | degC | Telescope girdle temperature at beginning of scan. | phys.temperature | |
| focus | smallint | 2 | Focus setting of telescope at beginning of scan. | instr.tel.focalLength | ||
| hry | smallint | 2 | Flag indicating the H-band array configuration for the camera. | meta.code | ||
| c_strat | smallint | 2 | Flag indicating the calibration strategy for this night's data. | meta.code | ||
| j_zp_ap | real | 4 | mag | Photometric zero-point for J-band aperture photometry. | phot.mag;arith.zp | |
| h_zp_ap | real | 4 | mag | Photometric zero-point for H-band aperture photometry. | phot.mag;arith.zp | |
| k_zp_ap | real | 4 | mag | Photometric zero-point for Ks-band aperture photometry. | phot.mag;arith.zp | |
| h_zperr_ap | real | 4 | mag | RMS-error of zero-point for H-band aperture photometry | stat.error | |
| k_zperr_ap | real | 4 | mag | RMS-error of zero-point for Ks-band aperture photometry | stat.error | |
| j_n_snr10 | int | 4 | Number of point sources at J-band with SNR>10 (instrumental mag <=15.8) | meta.number | ||
| h_n_snr10 | int | 4 | Number of point sources at H-band with SNR>10 (instrumental mag <=15.1) | meta.number | ||
| k_n_snr10 | int | 4 | Number of point sources at Ks-band with SNR>10 (instrumental mag <=14.3) | meta.number | ||
| n_ext | int | 4 | Number of regular extended sources detected in scan. | meta.number | ||
| j_shape_avg | real | 4 | J-band average seeing shape for scan. | instr.obsty.seeing | ||
| h_shape_avg | real | 4 | H-band average seeing shape for scan. | instr.obsty.seeing | ||
| k_shape_avg | real | 4 | Ks-band average seeing shape for scan. | instr.obsty.seeing | ||
| j_shape_rms | real | 4 | RMS-error of J-band average seeing shape. | instr.obsty.seeing | ||
| h_shape_rms | real | 4 | RMS-error of H-band average seeing shape. | instr.obsty.seeing | ||
| k_shape_rms | real | 4 | RMS-error of Ks-band average seeing shape. | instr.obsty.seeing | ||
| j_2mrat | real | 4 | J-band average 2nd image moment ratio. | stat.fit.param | ||
| h_2mrat | real | 4 | H-band average 2nd image moment ratio. | stat.fit.param | ||
| k_2mrat | real | 4 | Ks-band average 2nd image moment ratio. | stat.fit.param | ||
| j_psp | real | 4 | J-band photometric sensitivity paramater (PSP). | instr.sensitivity | ||
| h_psp | real | 4 | H-band photometric sensitivity paramater (PSP). | instr.sensitivity | ||
| k_psp | real | 4 | Ks-band photometric sensitivity paramater (PSP). | instr.sensitivity | ||
| j_pts_noise | real | 4 | Base-10 logarithm of the mode of the noise distribution for all point source detections in the scan, where the noise is estimated from the measured J-band photometric errors and is expressed in units of mJy. | instr.det.noise | ||
| h_pts_noise | real | 4 | Base-10 logarithm of the mode of the noise distribution for all point source detections in the scan, where the noise is estimated from the measured H-band photometric errors and is expressed in units of mJy. | instr.det.noise | ||
| k_pts_noise | real | 4 | Base-10 logarithm of the mode of the noise distribution for all point source detections in the scan, where the noise is estimated from the measured Ks-band photometric errors and is expressed in units of mJy. | instr.det.noise | ||
| j_msnr10 | real | 4 | mag | The estimated J-band magnitude at which SNR=10 is achieved for this scan. | phot.flux | |
| h_msnr10 | real | 4 | mag | The estimated H-band magnitude at which SNR=10 is achieved for this scan. | phot.flux | |
| k_msnr10 | real | 4 | mag | The estimated Ks-band magnitude at which SNR=10 is achieved for this scan. | phot.flux | |
| rel0 | smallint | 2 | Flag indicating whether the scan is contained in the TWOMASS Sampler Release. | meta.code | ||
| rel1 | smallint | 2 | Flag indicating whether the scan is contained in the TWOMASS First Incremental Data Release (IDR1). | meta.code | ||
| rel2 | smallint | 2 | Flag indicating whether the scan is contained in the TWOMASS Second Incremental Data Release (IDR2). | meta.code | ||
| Total length | 312 |