{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T22:07:54.763Z","years_from_j2000":26.679,"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-170001","name":"PGC 170001","class":"spiral_galaxy_sa","category":"galaxy","object_type":"Spiral galaxy Sa","mag":14.631,"mag_band":"B","abs_mag":-20.258928494249986,"abs_mag_band":"B","distance_ly":310035606.6179054,"distance_method":"luminosity distance from a spectroscopic redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":11.246758,"dec_deg":-8.889671,"epoch_ra_deg":11.58669,"epoch_dec_deg":-8.742632,"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":"Cetus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-170001","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.631,"h_mag":11.434,"j_mag":12.156,"k_mag":11.208,"redshift":0.01959,"hubble_type":"Sa","redshift_cmb":0.021834335850095,"uncertainties":{"distance_ly":[15885178.319228832,15888644.625407783],"stellar_mass_solar":[3736527827.27937,3736527827.27937]},"major_axis_arcmin":0.736077,"minor_axis_arcmin":0.52681,"morphology_source":"SIMBAD (2016MNRAS.456.2848H, quality D)","position_angle_deg":3,"stellar_mass_solar":28023958704.595276},"designations":[{"catalog":"2MASX","designation":"2MASX 00445922-0853228"},{"catalog":"PGC","designation":"PGC 170001"},{"catalog":"WISExSCOS","designation":"WISExSCOS J004459.24-085322.8"}],"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."}