{"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":"2026-08-31T12:07:03.055Z","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-1613","name":"IC 1613","class":"irregular_galaxy_i","category":"galaxy","object_type":"Irregular galaxy I","mag":9.54,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":16.199125,"dec_deg":2.117777777777778,"epoch_ra_deg":16.544619,"epoch_dec_deg":2.261827,"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":"Cetus","discovered":"1906","featured":false,"url":"https://spacecatalog.org/object/ic-1613","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":10.01,"v_mag":9.54,"redshift":-0.000777,"hubble_type":"I","wikidata_id":"Q663703","redshift_cmb":-0.0018595436441940505,"discovered_by":"Max Wolf","ngc_type_code":"G","major_axis_arcmin":18.32,"minor_axis_arcmin":17.14,"wikipedia_article":"IC 1613","position_angle_deg":50,"surface_brightness":25,"radial_velocity_km_s":-233},"designations":[{"catalog":"Caldwell","designation":"C 51"},{"catalog":"IC","designation":"IC 1613"},{"catalog":"IRAS","designation":"IRAS 01025+0153"},{"catalog":"IRAS","designation":"IRAS F01024+0153"},{"catalog":"LEDA","designation":"LEDA 3844"},{"catalog":"MCG","designation":"MCG +00-03-070"},{"catalog":"PGC","designation":"PGC 3844"},{"catalog":"UGC","designation":"UGC 668"}],"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."}