{"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":"2026-09-02T08:49:07.120Z","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-3540150","name":"PGC 3540150","class":"galaxy","category":"galaxy","object_type":"Galaxy","mag":16.98,"mag_band":"B","abs_mag":-17.710106156258068,"abs_mag_band":"B","distance_ly":282778968.82647413,"distance_method":"luminosity distance from a photometric redshift (GLADE+), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":165.095,"dec_deg":44.95716,"epoch_ra_deg":165.479039,"epoch_dec_deg":44.813176,"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":"Ursa Major","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-3540150","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":16.98,"h_mag":13.691,"j_mag":14.353,"k_mag":13.33,"redshift":0.0211373505687,"redshift_cmb":0.0199426786720704,"uncertainties":{"distance_ly":[61794124.697623074,62160020.207950056],"stellar_mass_solar":[1868286124.889619,1868286124.889619]},"stellar_mass_solar":4670715312.224048},"designations":[{"catalog":"2MASX","designation":"2MASX 11002289+4457259"},{"catalog":"Other","designation":"2MASXJ11002289+4457259"},{"catalog":"PGC","designation":"PGC 3540150"},{"catalog":"WISExSCOS","designation":"WISExSCOS J110022.86+445725.9"}],"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":"2026-09-01T22:58:55.274Z","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."}