{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.676","julian_year":2026.676,"time":"2026-09-04T18:35:25.678Z","years_from_j2000":26.676,"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-4550282","name":"PGC 4550282","class":"spiral_galaxy_sm_im","category":"galaxy","object_type":"Spiral galaxy Sm/Im","mag":17.06,"mag_band":"B","abs_mag":-13.874053753414696,"abs_mag_band":"B","distance_ly":50146038.05241356,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":191.087,"dec_deg":6.08963,"epoch_ra_deg":191.428273,"epoch_dec_deg":5.942543,"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":"Virgo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-4550282","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":17.06,"redshift":0.00435309217655,"hubble_type":"Sm/Im","redshift_cmb":0.0035801737794122,"uncertainties":{"distance_ly":[15481507.592010964,15494221.456489155]},"major_axis_arcmin":0.52547,"minor_axis_arcmin":0.195422,"morphology_source":"SIMBAD (2015ApJS..217...27A, quality C)","position_angle_deg":30},"designations":[{"catalog":"PGC","designation":"PGC 4550282"},{"catalog":"SDSSJ","designation":"SDSSJ 124420.88+060522.5"}],"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":"2026-09-02T19:50:56.720Z","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."}