{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T19:01:59.178Z","years_from_j2000":26.665,"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-764","name":"IC 764","class":"intermediate_spiral_galaxy_sabc","category":"galaxy","object_type":"Intermediate spiral galaxy SABc","mag":12.41,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":115449793.18585332,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":182.559125,"dec_deg":-29.736805555555556,"epoch_ra_deg":182.90585,"epoch_dec_deg":-29.886203,"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":"Hydra","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-764","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.95,"h_mag":10.09,"j_mag":10.66,"k_mag":9.71,"v_mag":12.41,"redshift":0.007103,"hubble_type":"SABc","wikidata_id":"Q3711832","redshift_cmb":0.008213679051394474,"ngc_type_code":"G","uncertainties":{"distance_ly":[14814540.703257963,14814540.703257963]},"major_axis_arcmin":4.84,"minor_axis_arcmin":1.14,"position_angle_deg":177,"surface_brightness":23.93,"radial_velocity_km_s":2122},"designations":[{"catalog":"2MASX","designation":"2MASX J12101419-2944125"},{"catalog":"ESO","designation":"ESO 441-013"},{"catalog":"ESO","designation":"ESO 441-13"},{"catalog":"ESO-LV","designation":"ESO-LV 441-0130"},{"catalog":"IC","designation":"IC 764"},{"catalog":"IRAS","designation":"IRAS 12076-2927"},{"catalog":"IRAS","designation":"IRAS F12076-2927"},{"catalog":"LEDA","designation":"LEDA 38711"},{"catalog":"MCG","designation":"MCG -05-29-025"},{"catalog":"PGC","designation":"PGC 38711"},{"catalog":"UGCA","designation":"UGCA 273"}],"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."}