{"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":"2026-08-31T09:43:12.324Z","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-4351","name":"IC 4351","class":"spiral_galaxy_sb","category":"galaxy","object_type":"Spiral galaxy Sb","mag":11.62,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":138181879.05235246,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":209.47608333333332,"dec_deg":-29.315722222222224,"epoch_ra_deg":209.860565,"epoch_dec_deg":-29.446734,"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":"1901","featured":false,"url":"https://spacecatalog.org/object/ic-4351","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.58,"h_mag":8.34,"j_mag":9.09,"k_mag":8.02,"v_mag":11.62,"redshift":0.008939,"hubble_type":"Sb","wikidata_id":"Q2591623","redshift_cmb":0.009819072645889992,"ngc_type_code":"G","uncertainties":{"distance_ly":[15142881.680393502,15142881.680393502]},"major_axis_arcmin":6.55,"minor_axis_arcmin":1.04,"position_angle_deg":18,"surface_brightness":24.19,"radial_velocity_km_s":2668},"designations":[{"catalog":"2MASX","designation":"2MASX J13575425-2918566"},{"catalog":"ESO","designation":"ESO 445-084"},{"catalog":"ESO","designation":"ESO 445-84"},{"catalog":"ESO-LV","designation":"ESO-LV 445-0840"},{"catalog":"IC","designation":"IC 4351"},{"catalog":"IRAS","designation":"IRAS 13550-2904"},{"catalog":"IRAS","designation":"IRAS F13550-2904"},{"catalog":"LEDA","designation":"LEDA 3149676"},{"catalog":"LEDA","designation":"LEDA 49676"},{"catalog":"MCG","designation":"MCG -05-33-034"},{"catalog":"PGC","designation":"PGC 49676"},{"catalog":"UGCA","designation":"UGCA 376"}],"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."}