{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-05T20:42:12.598Z","years_from_j2000":26.679,"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-3982","name":"NGC 3982","class":"intermediate_spiral_galaxy_sabb","category":"galaxy","object_type":"Intermediate spiral galaxy SABb","mag":11.7,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":59932695.98217028,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":179.11720833333334,"dec_deg":55.12525,"epoch_ra_deg":179.467298,"epoch_dec_deg":54.975746,"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":"Ursa Major","discovered":"1789","featured":false,"url":"https://spacecatalog.org/object/ngc-3982","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":11.81,"h_mag":9.08,"j_mag":9.77,"k_mag":8.85,"v_mag":11.7,"redshift":0.00371,"hubble_type":"SABb","wikidata_id":"Q735779","redshift_cmb":0.004276630340891874,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14230027.32980459,14230027.32980459]},"major_axis_arcmin":2.13,"minor_axis_arcmin":1.87,"wikipedia_article":"NGC 3982","position_angle_deg":25,"surface_brightness":22.05,"radial_velocity_km_s":1110},"designations":[{"catalog":"2MASX","designation":"2MASX J11562816+5507313"},{"catalog":"IRAS","designation":"IRAS 11538+5524"},{"catalog":"IRAS","designation":"IRAS F11538+5524"},{"catalog":"LEDA","designation":"LEDA 37520"},{"catalog":"MCG","designation":"MCG +09-20-036"},{"catalog":"NGC","designation":"NGC 3982"},{"catalog":"PGC","designation":"PGC 37520"},{"catalog":"SDSS","designation":"SDSS J115628.12+550730.8"},{"catalog":"SDSS","designation":"SDSS J115628.13+550730.8"},{"catalog":"SDSS","designation":"SDSS J115628.13+550730.9"},{"catalog":"UGC","designation":"UGC 6918"}],"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."}