{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T20:54:59.812Z","years_from_j2000":26.668,"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-3488","name":"IC 3488","class":"elliptical_galaxy_e","category":"galaxy","object_type":"Elliptical galaxy E","mag":15.57,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":356189974.54323554,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":188.28520833333334,"dec_deg":26.34936111111111,"epoch_ra_deg":188.619484,"epoch_dec_deg":26.201179,"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-3488","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.57,"h_mag":11.32,"j_mag":12.06,"k_mag":11.15,"redshift":0.02404,"hubble_type":"E","wikidata_id":"Q3686180","redshift_cmb":0.02502581557923378,"ngc_type_code":"G","uncertainties":{"distance_ly":[20217824.281687774,20217824.281687774]},"major_axis_arcmin":0.64,"minor_axis_arcmin":0.59,"position_angle_deg":73,"surface_brightness":23.39,"radial_velocity_km_s":7120},"designations":[{"catalog":"2MASX","designation":"2MASX J12330846+2620571"},{"catalog":"IC","designation":"IC 3488"},{"catalog":"LEDA","designation":"LEDA 41671"},{"catalog":"MCG","designation":"MCG +05-30-019"},{"catalog":"PGC","designation":"PGC 41671"},{"catalog":"SDSS","designation":"SDSS J123308.43+262057.6"},{"catalog":"SDSS","designation":"SDSS J123308.44+262057.6"},{"catalog":"SDSS","designation":"SDSS J123308.44+262057.7"},{"catalog":"SDSS","designation":"SDSS J123308.45+262057.7"}],"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."}