{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T08:00:57.343Z","years_from_j2000":26.669,"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":"ic-3986","name":"IC 3986","class":"elliptical_galaxy_e","category":"galaxy","object_type":"Elliptical galaxy E","mag":13.35,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":233620850.78893462,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":195.3839166666667,"dec_deg":-32.29105555555555,"epoch_ra_deg":195.751936,"epoch_dec_deg":-32.435662,"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":"Centaurus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-3986","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.35,"h_mag":9.1,"j_mag":9.8,"k_mag":8.85,"redshift":0.015504,"hubble_type":"E","wikidata_id":"Q3684518","redshift_cmb":0.016517833638680646,"ngc_type_code":"G","uncertainties":{"distance_ly":[16996912.67989086,16996912.67989086]},"major_axis_arcmin":1.85,"minor_axis_arcmin":1.38,"position_angle_deg":124,"surface_brightness":23.54,"radial_velocity_km_s":4612},"designations":[{"catalog":"2MASX","designation":"2MASX J13013213-3217276"},{"catalog":"ESO","designation":"ESO 443-032"},{"catalog":"ESO","designation":"ESO 443-32"},{"catalog":"ESO-LV","designation":"ESO-LV 443-0320"},{"catalog":"IC","designation":"IC 3986"},{"catalog":"LEDA","designation":"LEDA 44905"},{"catalog":"MCG","designation":"MCG -05-31-016"},{"catalog":"PGC","designation":"PGC 44905"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}