{"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":"2026-09-06T13:15:50.975Z","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-5757","name":"NGC 5757","class":"spiral_galaxy_sb","category":"galaxy","object_type":"Spiral galaxy Sb","mag":13.6,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":139678827.45505854,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":221.94324999999998,"dec_deg":-19.078555555555557,"epoch_ra_deg":222.32168,"epoch_dec_deg":-19.191006,"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":"1787","featured":false,"url":"https://spacecatalog.org/object/ngc-5757","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.27,"h_mag":9.19,"j_mag":9.86,"k_mag":8.89,"v_mag":13.6,"redshift":0.009189,"hubble_type":"Sb","wikidata_id":"Q1122660","redshift_cmb":0.009924656015230182,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15166193.444285907,15166193.444285907]},"major_axis_arcmin":2.09,"minor_axis_arcmin":1.39,"position_angle_deg":178,"surface_brightness":23.32,"radial_velocity_km_s":2742},"designations":[{"catalog":"2MASX","designation":"2MASX J14474636-1904427"},{"catalog":"ESO","designation":"ESO 580-033"},{"catalog":"ESO","designation":"ESO 580-33"},{"catalog":"ESO-LV","designation":"ESO-LV 580-0330"},{"catalog":"IRAS","designation":"IRAS 14449-1852"},{"catalog":"IRAS","designation":"IRAS F14449-1852"},{"catalog":"LEDA","designation":"LEDA 52839"},{"catalog":"LEDA","designation":"LEDA 860092"},{"catalog":"MCG","designation":"MCG -03-38-014"},{"catalog":"NGC","designation":"NGC 5757"},{"catalog":"PGC","designation":"PGC 52839"},{"catalog":"PGC","designation":"PGC 860092"}],"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."}