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Table: skymapper_dr4.photometry
(The bold columns are indexed columns)
| Column Name | Description | Datatype |
|---|---|---|
| a | Length of object semi-major axis in pixels | REAL |
| b | Length of object semi-minor axis in pixels | REAL |
| background | Mean background level in counts | DOUBLE |
| ccd | CCD on which the object was detected (1-32) | INTEGER |
| chi2_psf | Reduced Chi-squared of PSF fit | REAL |
| class_star | Source Extractor stellarity index (between 0=not star and 1=star) | REAL |
| decl_img | ICRS Declination of the object on this image | DOUBLE |
| e_a | Error in semi-major axis | REAL |
| e_b | Error in semi-minor axis | REAL |
| e_flux_ap02 | Error in 2 arcsec aperture flux | DOUBLE |
| e_flux_ap03 | Error in 3 arcsec aperture flux | DOUBLE |
| e_flux_ap04 | Error in 4 arcsec aperture flux | DOUBLE |
| e_flux_ap05 | Error in 5 arcsec aperture flux | DOUBLE |
| e_flux_ap06 | Error in 6 arcsec aperture flux | DOUBLE |
| e_flux_ap08 | Error in 8 arcsec aperture flux | DOUBLE |
| e_flux_ap10 | Error in 10 arcsec aperture flux | DOUBLE |
| e_flux_ap15 | Error in 15 arcsec aperture flux | DOUBLE |
| e_flux_ap20 | Error in 20 arcsec aperture flux | DOUBLE |
| e_flux_ap30 | Error in 30 arcsec aperture flux | DOUBLE |
| e_flux_kron | Error in Kron flux | DOUBLE |
| e_flux_petro | Error in Petrosian flux | DOUBLE |
| e_flux_psf | Error in PSF counts | DOUBLE |
| elong | Object elongation (a/b) | REAL |
| e_mag_apc02 | Error in 2 arcsec aperture magnitude | REAL |
| e_mag_apc03 | Error in 3 arcsec aperture magnitude | REAL |
| e_mag_apc04 | Error in 4 arcsec aperture magnitude | REAL |
| e_mag_apc05 | Error in 5 arcsec aperture magnitude | REAL |
| e_mag_apc06 | Error in 6 arcsec aperture magnitude | REAL |
| e_mag_apc08 | Error in 8 arcsec aperture magnitude | REAL |
| e_mag_apc10 | Error in 10 arcsec aperture magnitude | REAL |
| e_mag_apr15 | Error in 15 arcsec aperture magnitude | REAL |
| e_mag_apr20 | Error in 20 arcsec aperture magnitude | REAL |
| e_mag_apr30 | Error in 30 arcsec aperture magnitude | REAL |
| e_mag_kron | Error in Kron magnitude | REAL |
| e_mag_petro | Error in Petrosian magnitude | REAL |
| e_mag_psf | Error in PSF magnitude | REAL |
| e_pa | Error in position angle | REAL |
| filter | SkyMapper photometric filter (u, v, g, r, i, z) | CHAR |
| flags | Flags raised by Source Extractor | SMALLINT |
| flux_ap02 | Total counts within 2 arcsec diameter aperture centred on object | REAL |
| flux_ap03 | Total counts within 3 arcsec diameter aperture centred on object | REAL |
| flux_ap04 | Total counts within 4 arcsec diameter aperture centred on object | REAL |
| flux_ap05 | Total counts within 5 arcsec diameter aperture centred on object | REAL |
| flux_ap06 | Total counts within 6 arcsec diameter aperture centred on object | REAL |
| flux_ap08 | Total counts within 8 arcsec diameter aperture centred on object | REAL |
| flux_ap10 | Total counts within 10 arcsec diameter aperture centred on object | REAL |
| flux_ap15 | Total counts within 15 arcsec diameter aperture centred on object | REAL |
| flux_ap20 | Total counts within 20 arcsec diameter aperture centred on object | REAL |
| flux_ap30 | Total counts within 30 arcsec diameter aperture centred on object | REAL |
| flux_kron | Total counts within Kron ellipse | REAL |
| flux_max | Peak count above background of the brightest object pixel | REAL |
| flux_petro | Total counts within Petrosian ellipse | REAL |
| flux_psf | Total counts under PSF fit | REAL |
| fwhm | Object full width at half maximum on detector | REAL |
| imaflags | OR-combined flagged pixel types within isophotal radius from bad, saturated, and crosstalk pixel mask | INTEGER |
| image_id | Unique image ID as used by the Science Data Pipeline | BIGINT |
| img_qual | Quality level of this image from 1=best to 3=worst | SMALLINT |
| mag_apc02 | ZP-corrected magnitude within 2 arcsec diameter aperture, corrected for PSF losses | REAL |
| mag_apc03 | ZP-corrected magnitude within 3 arcsec diameter aperture, corrected for PSF losses | REAL |
| mag_apc04 | ZP-corrected magnitude within 4 arcsec diameter aperture, corrected for PSF losses | REAL |
| mag_apc05 | ZP-corrected magnitude within 5 arcsec diameter aperture, corrected for PSF losses | REAL |
| mag_apc06 | ZP-corrected magnitude within 6 arcsec diameter aperture, corrected for PSF losses | REAL |
| mag_apc08 | ZP-corrected magnitude within 8 arcsec diameter aperture, corrected for PSF losses | REAL |
| mag_apc10 | ZP-corrected magnitude within 10 arcsec diameter aperture, corrected for PSF losses | REAL |
| mag_apr15 | ZP-corrected magnitude within 15 arcsec diameter aperture, NOT corrected for PSF losses | REAL |
| mag_apr20 | ZP-corrected magnitude within 20 arcsec diameter aperture, NOT corrected for PSF losses | REAL |
| mag_apr30 | ZP-corrected magnitude within 30 arcsec diameter aperture, NOT corrected for PSF losses | REAL |
| mag_kron | ZP-corrected Kron magnitude | DOUBLE |
| mag_petro | ZP-corrected Petrosian magnitude | DOUBLE |
| mag_psf | ZP-corrected PSF magnitude | REAL |
| mu_max | ZP-corrected peak surface brightness of object above background | REAL |
| nimaflags | Number of flagged pixels from bad, saturated, and crosstalk pixel mask | INTEGER |
| object_id | Global object ID in master table associated with this observation. | BIGINT |
| object_id_local | Object ID in this (image,CCD) tuple. Not globally unique. | INTEGER |
| pa | Object ellipse position angle on sky (E of N, -90..+90 deg) | REAL |
| radius_frac20 | Radius of circular aperture enclosing 20 per cent of total (Kron) flux | REAL |
| radius_frac50 | Radius of circular aperture enclosing 50 per cent of total (Kron) flux (i.e. half-light radius) | REAL |
| radius_frac90 | Radius of circular aperture enclosing 90 per cent of total (Kron) flux | REAL |
| radius_kron | Radius of Kron ellipse in units of a and b | REAL |
| radius_petro | Radius of Petrosian ellipse in units of a and b | REAL |
| ra_img | ICRS Right Ascension of the object on this image | DOUBLE |
| random_id | Random ID in the range 0.0 => 100.0 | REAL |
| use_in_clipped | Flag indicating whether this observation was used in computing the clipped mean magnitudes in the master table | SMALLINT |
| x_img | CCD x-pixel coordinate of the object on this image | REAL |
| x_mosaic | Mosaic x-pixel coordinate of the object on this image | REAL |
| y_img | CCD y-pixel coordinate of the object on this image | REAL |
| y_mosaic | Mosaic y-pixel coordinate of the object on this image | REAL |
