Data model: photo2MASS

General description: Contains matches of the SDSS imaging data to the 2MASS Point Source Catalog, for a single field. Identification information for the SDSS source is given, along with all of the 2MASS information. See the official 2MASS documentation for detailed documentation of the 2MASS formats. These matches are to any objects which are RUN_PRIMARY according to the local resolve (see resolve documentation).

Naming convention: photo2MASS-RUN6-CAMCOL-FIELD4.fits

Approximate size: 20 kbytes.

File type: FITS

Read by products: sas

Written by products: photoop

Required header keywords:

• P_RESOLV (string): path for PHOTO_RESOLVE variable
• P_CALIB (string): path for PHOTO_CALIB variable

Required column names:

• run (int32): Run number
• camcol (int32): Camera column
• field (int32): Field number
• id (int32): The object id within a field. Usually changes between reruns of the same field
• rerun (string): Rerun number
• objID (int64): Unique SDSS identifier composed from [skyVersion,rerun,run,camcol,field,obj].
• run_resolve_status (int32): status flag for local resolve
• ra (float64): SDSS right ascension, J2000 (deg)
• dec (float64): SDSS declination, J2000 (deg)
• tmass_ra (float64): 2MASS right ascension, J2000 (deg)
• tmass_dec (float64): 2MASS declination, J2000 (deg)
• tmass_err_maj (float32): Semi-major axis length of the one sigma position uncertainty ellipse (arcsec)
• tmass_err_min (float32): Semi-minor axis length of the one sigma position uncertainty ellipse (arcsec)
• tmass_err_ang (float32): Position angle on the sky of the semi-major axis of the position uncertainty ellipse (East of North) (deg)
• tmass_j (float32): default J-band apparent magnitude (Vega relative, no Galactic extinction correction (mag)
• tmass_j_ivar (float32): inverse variance in J-band apparent magnitude (inverse)
• tmass_h (float32): default H-band apparent magnitude (Vega relative, no Galactic extinction correction (mag)
• tmass_h_ivar (float32): inverse variance in H-band apparent magnitude (inverse)
• tmass_k (float32): default K-band apparent magnitude (Vega relative, no Galactic extinction correction (mag)
• tmass_k_ivar (float32): inverse variance in K-band apparent magnitude (inverse)
• tmass_ph_qual (string): photometric quality flag (see 2MASS PSC documentation)
• tmass_rd_flg (string): Read flag. Three character flag, one character per band [JHKs], that indicates the origin of the default magnitudes and uncertainties in each band (see 2MASS PSC documentation)
• tmass_bl_flg (string): Blend flag. Three character flag, one character per band [JHKs], that indicates the number of components that were fit simultaneously when estimating the brightness of a source (see 2MASS PSC documentation)
• tmass_cc_flg (string): Contamination and confusion flag. Three character flag, one character per band [JHKs], that indicates that the photometry and/or position measurements of a source may be contaminated or biased due to proximity to an image artifact or nearby source of equal or greater brightness. (See 2MASS PSC documentation).
• tmass_ndetect[3] (int8): Number of frames on which 2MASS source was detected in each band
• tmass_nobserve[3] (int8): Number of frames which 2MASS source was within the boundaries of in each band
• tmass_gal_contam (int8): Extended source "contamination" flag. A value of gal_contam="0" indicates no contamination. "1" indicates it is probably an extended source itself (this does not detect all such cases!). "2" indicates it is within the boundary of a large XSC source. (See 2MASS PSC documentation).
• tmass_mp_flg (int8): Minor planet flag. "1" if source associated with known solar system object, "0" otherwise. (See 2MASS PSC documentation).
• tmass_pts_key (int32): Unique identification number for the PSC source.
• tmass_hemis (string): Hemisphere code for the 2MASS Observatory from which this source was observed. "n" means North (Mt. Hopkins); "s" means South (CTIO).
• tmass_jdate (float64): Julian Date of the source measurement accurate to +30 seconds. (See 2MASS PSC documentation).
• tmass_dup_src (int8): Duplicate source flag. Used in conjunction with the use_src flag, this numerical flag indicates whether the source falls in a Tile overlap region, and if so, if it was detected multiple times. (See 2MASS PSC documentation)
• tmass_use_src (int8): Use source flag. Used in conjunction with the dup_src flag, this numerical flag indicates if a source falls within a Tile overlap region, and whether or not it satisfies the unbiased selection rules for multiple source resolution. (See 2MASS PSC documentation).