{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.664","julian_year":2026.664,"time":"2026-08-31T14:53:46.063Z","years_from_j2000":26.664,"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-3459","name":"IC 3459","class":"irregular_galaxy_i","category":"galaxy","object_type":"Irregular galaxy I","mag":14.91,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":187.98300000000003,"dec_deg":12.174027777777777,"epoch_ra_deg":188.322918,"epoch_dec_deg":12.025754,"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":"Virgo","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-3459","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.91,"h_mag":13.19,"j_mag":13.41,"k_mag":12.63,"redshift":0.00125,"hubble_type":"I","wikidata_id":"Q3686648","redshift_cmb":0.0023444320416858844,"ngc_type_code":"G","major_axis_arcmin":1.11,"minor_axis_arcmin":0.86,"position_angle_deg":163,"surface_brightness":23.65,"radial_velocity_km_s":375},"designations":[{"catalog":"2MASX","designation":"2MASX J12315603+1210261"},{"catalog":"IC","designation":"IC 3459"},{"catalog":"LEDA","designation":"LEDA 41505"},{"catalog":"MCG","designation":"MCG +02-32-115"},{"catalog":"PGC","designation":"PGC 41505"},{"catalog":"SDSS","designation":"SDSS J123155.91+121026.5"},{"catalog":"UGC","designation":"UGC 7674"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}