{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.674","julian_year":2026.674,"time":"2026-09-04T07:04:36.175Z","years_from_j2000":26.674,"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-1808","name":"NGC 1808","class":"spiral_galaxy_sa","category":"galaxy","object_type":"Spiral galaxy Sa","mag":10.21,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":47852526.248603545,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":76.92641666666667,"dec_deg":-37.51305555555555,"epoch_ra_deg":77.159118,"epoch_dec_deg":-37.4773,"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":"Columba","discovered":"1826","featured":false,"url":"https://spacecatalog.org/object/ngc-1808","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":10.83,"h_mag":6.98,"j_mag":7.64,"k_mag":6.66,"v_mag":10.21,"redshift":0.003343,"hubble_type":"Sa","wikidata_id":"Q748385","redshift_cmb":0.0034168524457738325,"discovered_by":"James Dunlop","ngc_type_code":"G","uncertainties":{"distance_ly":[14146517.503130462,14146517.503130462]},"major_axis_arcmin":5.42,"minor_axis_arcmin":1.83,"wikipedia_article":"NGC 1808","position_angle_deg":135,"surface_brightness":22.74,"radial_velocity_km_s":1000},"designations":[{"catalog":"2MASX","designation":"2MASX J05074234-3730469"},{"catalog":"ESO","designation":"ESO 305-008"},{"catalog":"ESO","designation":"ESO 305-8"},{"catalog":"ESO-LV","designation":"ESO-LV 305-0080"},{"catalog":"IRAS","designation":"IRAS 0505-375P01"},{"catalog":"IRAS","designation":"IRAS 05059-3734"},{"catalog":"IRAS","designation":"IRAS F05059-3734"},{"catalog":"LEDA","designation":"LEDA 16779"},{"catalog":"MCG","designation":"MCG -06-12-005"},{"catalog":"NGC","designation":"NGC 1808"},{"catalog":"PGC","designation":"PGC 16779"}],"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."}