ra: Right Ascension (J2000, in degrees).
dec: Declination (J2000, in degrees).

healpix: HEALPix pixel index for efficient spatial indexing.
fits_data: Name of the associated FITS image or reference band used (    
            "rSDSS", "gSDSS", "iSDSS", "zSDSS",
            "uJAVA", "J0378", "J0395", "J0410",
            "J0430", "J0515", "J0660", "J0861"), indicating the infrared band used for position prior or forced photometry.

X_IMAGE, Y_IMAGE: Pixel coordinates of the source in the detection image.
A_WORLD: Semi-major axis of the source’s intensity distribution (in degrees; related to size).
B_WORLD: Semi-minor axis of the source’s intensity distribution (in degrees).
RELERRA_WORLD, RELERRB_WORLD: Relative errors on A_WORLD and B_WORLD.
FWHM_WORLD: Full Width at Half Maximum of the source (in degrees); a measure of seeing + intrinsic size.
R_EFF: Effective radius (often in pixels or arcseconds; may be derived from Kron or Petrosian radii).
KRON_RADIUS: Kron radius scaling factor (unitless), used to define the aperture for MAG_AUTO.
PETRO_RADIUS: Petrosian radius (in pixels or arcseconds), used for MAG_PETRO.

CLASS_STAR: Star/galaxy classifier (0 = extended/galaxy, ~1 = point source/star). Based on neural network or PSF vs. model comparison.
MU_MAX: Central surface brightness (mag/arcsec²), often used in galaxy profile analysis.

Column	Aperture Diameter (arcsec)
MAG_APER_0_8	0.8″
MAG_APER_1_0	1.0″
MAG_APER_1_2	1.2″
MAG_APER_1_5	1.5″
MAG_APER_2_0	2.0″
MAG_APER_3_0	3.0″
MAG_APER_4_0	4.0″
MAG_APER_6_0	6.0″
MAG_APER3_WORSTPSF: Aperture magnitude (likely 3″) measured using the worst-seeing PSF among multi-band images (used for consistent color measurement).
Corresponding error columns (MAG_ERR_APER_...) give 1σ uncertainties for each aperture magnitude.

MAG_AUTO: Kron-like total magnitude (adaptive elliptical aperture); recommended for galaxy fluxes.
MAG_PETRO: Petrosian magnitude (used in SDSS-like analyses).
MAG_ISO: Isophotal magnitude (flux above a defined detection threshold).
MAG_PSFCOR: PSF-corrected magnitude (aperture magnitude corrected to total using PSF model); best for stars.
MAG_ISO_WORSTPSF, MAG_ERR_ISO_WORSTPSF: Isophotal magnitude/uncertainty using worst-seeing PSF.
MAG_ERR_AUTO, MAG_ERR_PETRO, MAG_ERR_ISO, MAG_ERR_PSFCOR: 1σ photometric errors for respective magnitudes.

FLAGS: SExtractor detection flags (bitmask). Non-zero values indicate issues (e.g., saturation, blending, edge proximity).
MASK_FLAGS: Additional masking flags from J-PLUS pipeline (e.g., cosmic rays, bad pixels, bright star masks).
NORM_WMAP_VAL: Normalized weight map value at source position (proxy for exposure time or data quality; higher = better).