{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T05:58:05.146Z","years_from_j2000":26.677,"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-5742","name":"NGC 5742","class":"lenticular_galaxy_s0","category":"galaxy","object_type":"Lenticular galaxy S0","mag":13.86,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":200250616.81176946,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":221.40366666666665,"dec_deg":-11.80963888888889,"epoch_ra_deg":221.7683,"epoch_dec_deg":-11.922999,"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":"Libra","discovered":"1885","featured":false,"url":"https://spacecatalog.org/object/ngc-5742","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.86,"h_mag":9.65,"j_mag":10.38,"k_mag":9.35,"redshift":0.013429,"hubble_type":"S0","wikidata_id":"Q1122539","redshift_cmb":0.014183125133517605,"discovered_by":"Francis Preserved Leavenworth","ngc_type_code":"G","uncertainties":{"distance_ly":[16269627.060102634,16269627.060102634]},"major_axis_arcmin":1.17,"minor_axis_arcmin":0.87,"position_angle_deg":72,"surface_brightness":23.05,"radial_velocity_km_s":3999},"designations":[{"catalog":"2MASX","designation":"2MASX J14453688-1148347"},{"catalog":"IRAS","designation":"IRAS 14428-1135"},{"catalog":"IRAS","designation":"IRAS F14428-1135"},{"catalog":"LEDA","designation":"LEDA 52707"},{"catalog":"MCG","designation":"MCG -02-38-007"},{"catalog":"NGC","designation":"NGC 5742"},{"catalog":"PGC","designation":"PGC 52707"}],"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."}