{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.666","julian_year":2026.666,"time":"2026-09-01T03:51:03.742Z","years_from_j2000":26.666,"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-4523","name":"IC 4523","class":"intermediate_spiral_galaxy_sabc","category":"galaxy","object_type":"Intermediate spiral galaxy SABc","mag":13.43,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":236198433.4347651,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":226.2939166666667,"dec_deg":-43.50952777777778,"epoch_ra_deg":226.739508,"epoch_dec_deg":-43.614059,"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":"Lupus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-4523","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.43,"h_mag":10.02,"j_mag":10.72,"k_mag":9.67,"redshift":0.01612,"hubble_type":"SABc","wikidata_id":"Q3682512","redshift_cmb":0.016697839263392966,"ngc_type_code":"G","uncertainties":{"distance_ly":[17056205.15193641,17056205.15193641]},"major_axis_arcmin":1.65,"minor_axis_arcmin":1.49,"position_angle_deg":119,"surface_brightness":23.41,"radial_velocity_km_s":4794},"designations":[{"catalog":"2MASX","designation":"2MASX J15051054-4330340"},{"catalog":"ESO","designation":"ESO 273-015"},{"catalog":"ESO","designation":"ESO 273-15"},{"catalog":"IC","designation":"IC 4523"},{"catalog":"IRAS","designation":"IRAS 15018-4318"},{"catalog":"IRAS","designation":"IRAS F15018-4318"},{"catalog":"LEDA","designation":"LEDA 53845"},{"catalog":"MCG","designation":"MCG -07-31-005"},{"catalog":"PGC","designation":"PGC 53845"}],"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."}