{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T17:50:33.193Z","years_from_j2000":26.67,"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-4030","name":"IC 4030","class":"lenticular_galaxy_s0","category":"galaxy","object_type":"Lenticular galaxy S0","mag":15.39,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":345286445.46555173,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":195.11654166666665,"dec_deg":27.955972222222222,"epoch_ra_deg":195.440895,"epoch_dec_deg":27.811172,"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":"Coma Berenices","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-4030","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":16.41,"h_mag":12.58,"j_mag":13.31,"k_mag":12.36,"v_mag":15.39,"redshift":0.02336,"hubble_type":"S0","wikidata_id":"Q3684312","redshift_cmb":0.02427317714920907,"ngc_type_code":"G","uncertainties":{"distance_ly":[19902830.67262925,19902830.67262925]},"major_axis_arcmin":0.53,"minor_axis_arcmin":0.36,"position_angle_deg":16,"surface_brightness":23.77,"radial_velocity_km_s":6921},"designations":[{"catalog":"2MASX","designation":"2MASX J13002798+2757216"},{"catalog":"IC","designation":"IC 4030"},{"catalog":"LEDA","designation":"LEDA 44763"},{"catalog":"PGC","designation":"PGC 44763"},{"catalog":"SDSS","designation":"SDSS J130027.96+275721.5"},{"catalog":"SDSS","designation":"SDSS J130027.96+275721.6"},{"catalog":"SDSS","designation":"SDSS J130027.97+275721.5"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}