{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.663","julian_year":2026.663,"time":"2026-08-31T07:09:51.530Z","years_from_j2000":26.663,"frame":"date","applied":"Proper motion, then precession and nutation. The catalogued J2000 position is carried along the great circle the object's own published motion puts it on, at a constant velocity, and the result is referred to the true equator and equinox of this instant. Those are separate things: the motion moves the object, and the rotation turns the grid under it by about fifty arcseconds a year, with nutation adding up to another seventeen.","excluded":"Parallax, the radial-velocity perspective term, aberration and refraction; each is below the accuracy of the catalogued positions themselves. An object with no published proper motion comes back where the catalogue has it rather than at a fabricated zero, and says so with a null pm_ra_mas_yr. A body with no fixed position is not propagated at all — its place comes from an ephemeris, which is what /api/v1/visible answers with."},"slug":"pgc-16","name":"PGC 16","class":"spiral_galaxy_sab","category":"galaxy","object_type":"Spiral galaxy Sab","mag":14.688,"mag_band":"B","abs_mag":-20.010355321588385,"abs_mag_band":"B","distance_ly":283855255.53329575,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":0.047133,"dec_deg":-5.158722,"epoch_ra_deg":0.391255,"epoch_dec_deg":-5.00926,"epoch_moved_arcsec":null,"pm_ra_mas_yr":null,"pm_dec_mas_yr":null,"orbits":null,"semi_major_axis_km":null,"periapsis_km":null,"mass_kg":null,"mass_msun":null,"constellation":"Pisces","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-16","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.688,"h_mag":11.946,"j_mag":12.566,"k_mag":11.663,"redshift":0.01906,"hubble_type":"Sab","redshift_cmb":0.0200174730995029,"uncertainties":{"distance_ly":[15541493.304256175,15544754.547605993],"stellar_mass_solar":[2802427884.4434066,2802427884.4434066]},"major_axis_arcmin":0.939543,"minor_axis_arcmin":0.462819,"morphology_source":"SIMBAD (2003A&A...412...45P, quality E)","position_angle_deg":36,"stellar_mass_solar":5604855768.886813},"designations":[{"catalog":"2MASX","designation":"2MASX 00001131-0509313"},{"catalog":"PGC","designation":"PGC 16"},{"catalog":"WISExSCOS","designation":"WISExSCOS J000011.30-050931.9"}],"source":{"id":"glade_plus","name":"GLADE+ (Galaxy List for the Advanced Detector Era)","url":"https://cdsarc.cds.unistra.fr/viz-bin/cat/VII/291","license":"VizieR terms; cite Dalya+ 2022 (2022MNRAS.514.1403D)"},"updated_at":"2026-08-30T09:56:50.739Z","attribution":"Data from SpaceCatalog.org. Individual records carry their source and license in `source`; attribution is required for CC-BY and CC-BY-SA rows."}