{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T13:02:28.036Z","years_from_j2000":26.675,"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-5311","name":"NGC 5311","class":"lenticular_galaxy_s0_a","category":"galaxy","object_type":"Lenticular galaxy S0-a","mag":13.3,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":134678952.8910988,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":207.2336666666667,"dec_deg":39.98511111111111,"epoch_ra_deg":207.521944,"epoch_dec_deg":39.851292,"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":"Canes Venatici","discovered":"1788","featured":false,"url":"https://spacecatalog.org/object/ngc-5311","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.46,"h_mag":9.47,"j_mag":10.17,"k_mag":9.25,"v_mag":13.3,"redshift":0.008936,"hubble_type":"S0-a","wikidata_id":"Q1118650","redshift_cmb":0.009571937980422884,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15089131.635187134,15089131.635187134]},"major_axis_arcmin":2.01,"minor_axis_arcmin":1.66,"position_angle_deg":102,"surface_brightness":23.6,"radial_velocity_km_s":2667},"designations":[{"catalog":"2MASX","designation":"2MASX J13485605+3959068"},{"catalog":"IRAS","designation":"IRAS 13467+4014"},{"catalog":"IRAS","designation":"IRAS 13468+4013"},{"catalog":"IRAS","designation":"IRAS F13468+4013"},{"catalog":"LEDA","designation":"LEDA 49011"},{"catalog":"MCG","designation":"MCG +07-28-072"},{"catalog":"NGC","designation":"NGC 5311"},{"catalog":"PGC","designation":"PGC 49011"},{"catalog":"SDSS","designation":"SDSS J134856.07+395906.6"},{"catalog":"SDSS","designation":"SDSS J134856.07+395906.7"},{"catalog":"UGC","designation":"UGC 8735"}],"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."}