{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T06:52:34.302Z","years_from_j2000":26.669,"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-56248","name":"PGC 56248","class":"spiral_galaxy","category":"galaxy","object_type":"Spiral galaxy","mag":15.976,"mag_band":"B","abs_mag":-18.8189308391999,"abs_mag_band":"B","distance_ly":296764565.01767796,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":237.970856,"dec_deg":25.978193,"epoch_ra_deg":238.253724,"epoch_dec_deg":25.897275,"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":"Corona Borealis","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-56248","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.976,"h_mag":13.527,"j_mag":14.288,"k_mag":13.329,"redshift":0.02203,"hubble_type":"6.69","redshift_cmb":0.0209139493075152,"uncertainties":{"distance_ly":[15456206.505515315,15461271.121998817],"stellar_mass_solar":[934137366.3899771,934137366.3899771]},"major_axis_arcmin":0.78018,"minor_axis_arcmin":0.478406,"morphology_source":"SIMBAD (2024ApJ...970...83B, quality C)","position_angle_deg":79,"stellar_mass_solar":1868274732.7799542},"designations":[{"catalog":"2MASX","designation":"2MASX 15515300+2558414"},{"catalog":"PGC","designation":"PGC 56248"},{"catalog":"WISExSCOS","designation":"WISExSCOS J155153.04+255842.3"}],"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":"2026-09-01T22:58:55.274Z","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."}