{"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":"2026-09-01T23:51:15.123Z","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":"ngc-5397","name":"NGC 5397","class":"elliptical_galaxy_e_s0","category":"galaxy","object_type":"Elliptical galaxy E-S0","mag":12.85,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":206078943.31050223,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":210.29358333333334,"dec_deg":-33.94583333333333,"epoch_ra_deg":210.68741,"epoch_dec_deg":-34.075803,"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":"Centaurus","discovered":"1837","featured":false,"url":"https://spacecatalog.org/object/ngc-5397","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.9,"h_mag":9.44,"j_mag":10.26,"k_mag":9.27,"v_mag":12.85,"redshift":0.013746,"hubble_type":"E-S0","wikidata_id":"Q1119325","redshift_cmb":0.014591474183111464,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[16391037.29824994,16391037.29824994]},"major_axis_arcmin":1.62,"minor_axis_arcmin":1.01,"position_angle_deg":65,"surface_brightness":23.66,"radial_velocity_km_s":4093},"designations":[{"catalog":"2MASX","designation":"2MASX J14011044-3356451"},{"catalog":"ESO","designation":"ESO 384-031"},{"catalog":"ESO","designation":"ESO 384-31"},{"catalog":"ESO-LV","designation":"ESO-LV 384-0310"},{"catalog":"IRAS","designation":"IRAS 13582-3342"},{"catalog":"IRAS","designation":"IRAS F13582-3342"},{"catalog":"LEDA","designation":"LEDA 49908"},{"catalog":"MCG","designation":"MCG -06-31-013"},{"catalog":"NGC","designation":"NGC 5397"},{"catalog":"PGC","designation":"PGC 49908"}],"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."}