{"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":"2026-09-02T07:43:00.233Z","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-200170","name":"PGC 200170","class":"elliptical_galaxy_de_d_e","category":"galaxy","object_type":"Elliptical galaxy dE(d:E)","mag":17.27,"mag_band":"B","abs_mag":-12.729841683513573,"abs_mag_band":"B","distance_ly":32613259.935822316,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":187.021,"dec_deg":13.61203,"epoch_ra_deg":187.361051,"epoch_dec_deg":13.463446,"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":"Coma Berenices","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-200170","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":17.27,"redshift":0.00310548155274,"hubble_type":"dE(d:E)","redshift_cmb":0.0023306346513225,"uncertainties":{"distance_ly":[10174768.579369742,10181789.099195626],"stellar_mass_solar":[2802739.592890232,2802739.592890232]},"major_axis_arcmin":0.36339,"minor_axis_arcmin":0.222213,"morphology_source":"SIMBAD (2014A&A...569A.124V, quality C)","position_angle_deg":11,"stellar_mass_solar":3736986.1238536434},"designations":[{"catalog":"PGC","designation":"PGC 200170"},{"catalog":"WISExSCOS","designation":"WISExSCOS J122804.94+133643.5"}],"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":"2026-09-01T22:58:55.274Z","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."}