{"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":"2026-09-02T11:15:34.198Z","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":"ic-2951","name":"IC 2951","class":"spiral_galaxy_sa","category":"galaxy","object_type":"Spiral galaxy Sa","mag":13.57,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":305550425.2698416,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":175.85233333333335,"dec_deg":19.749805555555557,"epoch_ra_deg":176.200869,"epoch_dec_deg":19.600852,"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/ic-2951","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.48,"h_mag":10.44,"j_mag":11.23,"k_mag":10.23,"v_mag":13.57,"redshift":0.02041,"hubble_type":"Sa","wikidata_id":"Q3688424","redshift_cmb":0.021523411913269452,"ngc_type_code":"G","uncertainties":{"distance_ly":[18797079.679624077,18797079.679624077]},"major_axis_arcmin":1.54,"minor_axis_arcmin":0.43,"position_angle_deg":81,"surface_brightness":23.65,"radial_velocity_km_s":6056},"designations":[{"catalog":"2MASX","designation":"2MASX J11432453+1944595"},{"catalog":"IC","designation":"IC 2951"},{"catalog":"LEDA","designation":"LEDA 36436"},{"catalog":"MCG","designation":"MCG +03-30-061"},{"catalog":"PGC","designation":"PGC 36436"},{"catalog":"SDSS","designation":"SDSS J114324.55+194459.3"},{"catalog":"UGC","designation":"UGC 6688"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"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."}