{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.682","julian_year":2026.682,"time":"2026-09-06T23:01:41.820Z","years_from_j2000":26.682,"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-3311","name":"NGC 3311","class":"elliptical_galaxy_e_s0","category":"galaxy","object_type":"Elliptical galaxy E-S0","mag":11.32,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":199206542.83322638,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":159.17841666666666,"dec_deg":-27.528333333333332,"epoch_ra_deg":159.493933,"epoch_dec_deg":-27.667469,"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":"Hydra","discovered":"1835","featured":false,"url":"https://spacecatalog.org/object/ngc-3311","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.8,"h_mag":8.38,"j_mag":8.97,"k_mag":8.1,"v_mag":11.32,"redshift":0.012953,"hubble_type":"E-S0","wikidata_id":"Q1104160","redshift_cmb":0.014109948442338593,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[16248140.190134736,16248140.190134736]},"major_axis_arcmin":2.63,"minor_axis_arcmin":2.33,"wikipedia_article":"NGC 3311","position_angle_deg":57,"surface_brightness":23.65,"radial_velocity_km_s":3858},"designations":[{"catalog":"2MASX","designation":"2MASX J10364282-2731420"},{"catalog":"ESO","designation":"ESO 501-038"},{"catalog":"ESO","designation":"ESO 501-38"},{"catalog":"ESO-LV","designation":"ESO-LV 501-0380"},{"catalog":"LEDA","designation":"LEDA 31478"},{"catalog":"MCG","designation":"MCG -04-25-036"},{"catalog":"NGC","designation":"NGC 3311"},{"catalog":"PGC","designation":"PGC 31478"}],"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."}