{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.663","julian_year":2026.663,"time":"2026-08-31T05:38:27.421Z","years_from_j2000":26.663,"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-342","name":"IC 342","class":"intermediate_spiral_galaxy_sabc","category":"galaxy","object_type":"Intermediate spiral galaxy SABc","mag":9.68,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":56.702083333333334,"dec_deg":68.09636111111111,"epoch_ra_deg":57.355394,"epoch_dec_deg":68.179648,"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":"Camelopardalis","discovered":"1892","featured":false,"url":"https://spacecatalog.org/object/ic-342","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":9.68,"h_mag":5.01,"j_mag":5.66,"k_mag":4.56,"redshift":0.000077,"hubble_type":"SABc","wikidata_id":"Q757396","redshift_cmb":-0.00022689184605884094,"discovered_by":"William Frederick Denning","ngc_type_code":"G","major_axis_arcmin":19.77,"minor_axis_arcmin":18.79,"wikipedia_article":"IC 342","position_angle_deg":0,"surface_brightness":24.85,"radial_velocity_km_s":23},"designations":[{"catalog":"2MASX","designation":"2MASX J03464851+6805459"},{"catalog":"Caldwell","designation":"C 5"},{"catalog":"IC","designation":"IC 342"},{"catalog":"IRAS","designation":"IRAS 03419+6756"},{"catalog":"IRAS","designation":"IRAS F03419+6756"},{"catalog":"LEDA","designation":"LEDA 13826"},{"catalog":"MCG","designation":"MCG +11-05-003"},{"catalog":"PGC","designation":"PGC 13826"},{"catalog":"UGC","designation":"UGC 2847"}],"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."}