{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.687","julian_year":2026.687,"time":"2026-09-08T18:48:49.377Z","years_from_j2000":26.687,"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-3120","name":"NGC 3120","class":"intermediate_spiral_galaxy_sabb","category":"galaxy","object_type":"Intermediate spiral galaxy SABb","mag":12.77,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":146805888.72869095,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":151.346,"dec_deg":-34.219944444444444,"epoch_ra_deg":151.640237,"epoch_dec_deg":-34.350301,"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":"Antlia","discovered":"1838","featured":false,"url":"https://spacecatalog.org/object/ngc-3120","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.51,"h_mag":9.92,"j_mag":10.61,"k_mag":9.7,"v_mag":12.77,"redshift":0.009363,"hubble_type":"SABb","wikidata_id":"Q1103027","redshift_cmb":0.010427117514073103,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15279956.587507555,15279956.587507555]},"major_axis_arcmin":1.68,"minor_axis_arcmin":1.17,"wikipedia_article":"NGC 3120","position_angle_deg":7,"surface_brightness":23.09,"radial_velocity_km_s":2794},"designations":[{"catalog":"2MASX","designation":"2MASX J10052305-3413118"},{"catalog":"ESO","designation":"ESO 374-029"},{"catalog":"ESO","designation":"ESO 374-29"},{"catalog":"ESO-LV","designation":"ESO-LV 374-0290"},{"catalog":"IRAS","designation":"IRAS 10031-3358"},{"catalog":"IRAS","designation":"IRAS F10031-3358"},{"catalog":"LEDA","designation":"LEDA 29278"},{"catalog":"MCG","designation":"MCG -06-22-017"},{"catalog":"NGC","designation":"NGC 3120"},{"catalog":"PGC","designation":"PGC 29278"}],"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."}