{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.654","julian_year":2026.654,"time":"2026-08-27T21:36:27.997Z","years_from_j2000":26.654,"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":"ngc-2475","name":"NGC 2475","class":"elliptical_galaxy_e","category":"galaxy","object_type":"Elliptical galaxy E","mag":13.11,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":269245162.15695286,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":119.50183333333334,"dec_deg":52.861694444444446,"epoch_ra_deg":120.018372,"epoch_dec_deg":52.789523,"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":"Lynx","discovered":"1856","featured":false,"url":"https://spacecatalog.org/object/ngc-2475","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.06,"h_mag":9.76,"j_mag":10.41,"k_mag":9.36,"v_mag":13.11,"redshift":0.018623,"hubble_type":"E","wikidata_id":"Q1049268","redshift_cmb":0.019001480074355204,"discovered_by":"William Parsons, 3rd Earl of Rosse","ngc_type_code":"G","uncertainties":{"distance_ly":[17852449.58356192,17852449.58356192]},"major_axis_arcmin":1.07,"minor_axis_arcmin":0.96,"position_angle_deg":68,"surface_brightness":23.08,"radial_velocity_km_s":5531},"designations":[{"catalog":"2MASX","designation":"2MASX J07580041+5251425"},{"catalog":"LEDA","designation":"LEDA 22322"},{"catalog":"MCG","designation":"MCG +09-13-097"},{"catalog":"NGC","designation":"NGC 2475"},{"catalog":"PGC","designation":"PGC 22322"},{"catalog":"SDSS","designation":"SDSS J075800.44+525142.1"},{"catalog":"UGC","designation":"UGC 04114 NED02"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-27T19:16:43.430Z","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."}