{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.685","julian_year":2026.685,"time":"2026-09-08T03:28:40.617Z","years_from_j2000":26.685,"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-4557876","name":"PGC 4557876","class":"galaxy","category":"galaxy","object_type":"Galaxy","mag":17.82,"mag_band":"B","abs_mag":-16.8005,"abs_mag_band":"B","distance_ly":273861820.9241721,"distance_method":"luminosity distance as published (GLADE+)","ra_deg":148.539,"dec_deg":28.10492,"epoch_ra_deg":148.925689,"epoch_dec_deg":27.978255,"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":"Leo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/pgc-4557876","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":17.82,"redshift":0.0198872199436,"redshift_cmb":0.0186845057523599,"uncertainties":{"distance_ly":[2940355.191700654,2940355.191700654],"stellar_mass_solar":[100000000,100000000]},"stellar_mass_solar":200000000},"designations":[{"catalog":"PGC","designation":"PGC 4557876"},{"catalog":"SDSSJ","designation":"SDSSJ 095409.31+280617.5"},{"catalog":"WISExSCOS","designation":"WISExSCOS J095409.29+280618.4"}],"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."}