{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.663","julian_year":2026.663,"time":"2026-08-31T07:07:26.479Z","years_from_j2000":26.663,"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-5124","name":"IC 5124","class":"lenticular_galaxy_s0_a","category":"galaxy","object_type":"Lenticular galaxy S0-a","mag":16.61,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":487368405.62052065,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":324.9799583333333,"dec_deg":-22.426944444444445,"epoch_ra_deg":325.359834,"epoch_dec_deg":-22.305593,"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":"Capricornus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-5124","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":16.61,"h_mag":12.48,"j_mag":13.16,"k_mag":12.15,"redshift":0.035038,"hubble_type":"S0-a","wikidata_id":"Q3680772","redshift_cmb":0.03401814271800707,"ngc_type_code":"G","uncertainties":{"distance_ly":[24311160.717498317,24311160.717498317]},"major_axis_arcmin":0.51,"minor_axis_arcmin":0.23,"position_angle_deg":134,"surface_brightness":23.83,"radial_velocity_km_s":10320},"designations":[{"catalog":"2MASX","designation":"2MASX J21395519-2225371"},{"catalog":"ESO","designation":"ESO 531-016"},{"catalog":"ESO","designation":"ESO 531-16"},{"catalog":"IC","designation":"IC 5124"},{"catalog":"LEDA","designation":"LEDA 67127"},{"catalog":"PGC","designation":"PGC 67127"}],"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."}