{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T13:56:23.044Z","years_from_j2000":26.667,"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-883","name":"IC 883","class":"spiral_galaxy_sm","category":"galaxy","object_type":"Spiral galaxy Sm","mag":14.71,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":339185971.44322366,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":200.14725,"dec_deg":34.1395,"epoch_ra_deg":200.457633,"epoch_dec_deg":33.99852,"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":"Canes Venatici","discovered":"1892","featured":false,"url":"https://spacecatalog.org/object/ic-883","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.71,"h_mag":11.23,"j_mag":11.99,"k_mag":10.93,"redshift":0.02306,"hubble_type":"Sm","wikidata_id":"Q1653354","redshift_cmb":0.023851724968456223,"discovered_by":"Stéphane Javelle","ngc_type_code":"G","uncertainties":{"distance_ly":[19728663.182538193,19728663.182538193]},"major_axis_arcmin":0.79,"minor_axis_arcmin":0.47,"wikipedia_article":"IC 883","position_angle_deg":152,"surface_brightness":22.59,"radial_velocity_km_s":6834},"designations":[{"catalog":"2MASX","designation":"2MASX J13203537+3408218"},{"catalog":"IC","designation":"IC 883"},{"catalog":"IRAS","designation":"IRAS 13183+3423"},{"catalog":"IRAS","designation":"IRAS F13182+3424"},{"catalog":"LEDA","designation":"LEDA 46560"},{"catalog":"PGC","designation":"PGC 46560"},{"catalog":"SDSS","designation":"SDSS J132035.40+340821.5"},{"catalog":"SDSS","designation":"SDSS J132035.40+340821.7"},{"catalog":"SDSS","designation":"SDSS J132035.41+340821.6"},{"catalog":"UGC","designation":"UGC 8387"}],"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."}