{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.681","julian_year":2026.681,"time":"2026-09-06T21:19:34.967Z","years_from_j2000":26.681,"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":"ngc-5523","name":"NGC 5523","class":"intermediate_spiral_galaxy_sabc","category":"galaxy","object_type":"Intermediate spiral galaxy SABc","mag":13.13,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":58753103.243687384,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":213.718,"dec_deg":25.317611111111113,"epoch_ra_deg":214.023803,"epoch_dec_deg":25.192147,"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":"Boötes","discovered":"1784","featured":false,"url":"https://spacecatalog.org/object/ngc-5523","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.13,"h_mag":10.26,"j_mag":10.68,"k_mag":9.74,"redshift":0.003482,"hubble_type":"SABc","wikidata_id":"Q1120724","redshift_cmb":0.004192724778749213,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14221161.275129452,14221161.275129452]},"major_axis_arcmin":2.04,"minor_axis_arcmin":0.89,"wikipedia_article":"NGC 5523","position_angle_deg":92,"surface_brightness":22.67,"radial_velocity_km_s":1042},"designations":[{"catalog":"2MASX","designation":"2MASX J14145230+2519034"},{"catalog":"IRAS","designation":"IRAS 14125+2533"},{"catalog":"IRAS","designation":"IRAS F14125+2533"},{"catalog":"LEDA","designation":"LEDA 50895"},{"catalog":"MCG","designation":"MCG +04-34-008"},{"catalog":"NGC","designation":"NGC 5523"},{"catalog":"PGC","designation":"PGC 50895"},{"catalog":"UGC","designation":"UGC 9119"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","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."}