{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.680","julian_year":2026.68,"time":"2026-09-06T04:56:09.579Z","years_from_j2000":26.68,"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-315","name":"NGC 315","class":"elliptical_galaxy_e","category":"galaxy","object_type":"Elliptical galaxy E","mag":11.6,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":268629593.99494576,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":14.453666666666667,"dec_deg":30.352444444444444,"epoch_ra_deg":14.818749,"epoch_dec_deg":30.497722,"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":"Pisces","discovered":"1784","featured":false,"url":"https://spacecatalog.org/object/ngc-315","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.21,"h_mag":8.21,"j_mag":8.95,"k_mag":7.96,"v_mag":11.6,"redshift":0.02,"hubble_type":"E","wikidata_id":"Q1036111","redshift_cmb":0.01895864024097449,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[17837035.04257453,17837035.04257453]},"major_axis_arcmin":2.86,"minor_axis_arcmin":2.14,"wikipedia_article":"NGC 315","position_angle_deg":45,"surface_brightness":23.35,"radial_velocity_km_s":5936},"designations":[{"catalog":"2MASX","designation":"2MASX J00574891+3021083"},{"catalog":"IRAS","designation":"IRAS F00550+3004"},{"catalog":"LEDA","designation":"LEDA 3455"},{"catalog":"MCG","designation":"MCG +05-03-031"},{"catalog":"NGC","designation":"NGC 315"},{"catalog":"PGC","designation":"PGC 3455"},{"catalog":"UGC","designation":"UGC 597"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"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."}