{"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":"2026-09-04T09:43:27.923Z","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-3511","name":"NGC 3511","class":"intermediate_spiral_galaxy_sabc","category":"galaxy","object_type":"Intermediate spiral galaxy SABc","mag":11.02,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":69258934.17841461,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":165.84904166666666,"dec_deg":-23.086777777777776,"epoch_ra_deg":166.176727,"epoch_dec_deg":-23.2313,"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":"Crater","discovered":"1786","featured":false,"url":"https://spacecatalog.org/object/ngc-3511","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":11.54,"h_mag":8.27,"j_mag":8.95,"k_mag":8.07,"v_mag":11.02,"redshift":0.003751,"hubble_type":"SABc","wikidata_id":"Q1105134","redshift_cmb":0.004939640780643018,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14305486.729937945,14305486.729937945]},"major_axis_arcmin":6.04,"minor_axis_arcmin":2,"wikipedia_article":"NGC 3511","position_angle_deg":76,"surface_brightness":23.29,"radial_velocity_km_s":1122},"designations":[{"catalog":"2MASX","designation":"2MASX J11032376-2305124"},{"catalog":"ESO","designation":"ESO 502-013"},{"catalog":"ESO","designation":"ESO 502-13"},{"catalog":"ESO-LV","designation":"ESO-LV 502-0130"},{"catalog":"IRAS","designation":"IRAS 11009-2248"},{"catalog":"IRAS","designation":"IRAS 11009-2249"},{"catalog":"IRAS","designation":"IRAS F11009-2249"},{"catalog":"LEDA","designation":"LEDA 33385"},{"catalog":"MCG","designation":"MCG -04-26-020"},{"catalog":"NGC","designation":"NGC 3511"},{"catalog":"PGC","designation":"PGC 33385"},{"catalog":"UGCA","designation":"UGCA 223"}],"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."}