{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T10:25:23.555Z","years_from_j2000":26.675,"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-819","name":"NGC 819","class":"spiral_galaxy_sbc","category":"galaxy","object_type":"Spiral galaxy Sbc","mag":14.09,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":298735680.02964544,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":32.143208333333334,"dec_deg":29.23402777777778,"epoch_ra_deg":32.531092,"epoch_dec_deg":29.361576,"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":"Triangulum","discovered":"1865","featured":false,"url":"https://spacecatalog.org/object/ngc-819","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.09,"h_mag":11.04,"j_mag":11.69,"k_mag":10.71,"redshift":0.021908,"hubble_type":"Sbc","wikidata_id":"Q1039447","redshift_cmb":0.021050729460345474,"discovered_by":"Heinrich Louis d'Arrest","ngc_type_code":"G","uncertainties":{"distance_ly":[18614666.14623386,18614666.14623386]},"major_axis_arcmin":0.6,"minor_axis_arcmin":0.45,"wikipedia_article":"NGC 819","position_angle_deg":5,"surface_brightness":21.49,"radial_velocity_km_s":6496},"designations":[{"catalog":"2MASX","designation":"2MASX J02083436+2914025"},{"catalog":"IRAS","designation":"IRAS 02056+2859"},{"catalog":"IRAS","designation":"IRAS F02056+2859"},{"catalog":"LEDA","designation":"LEDA 8174"},{"catalog":"NGC","designation":"NGC 819"},{"catalog":"PGC","designation":"PGC 8174"},{"catalog":"SDSS","designation":"SDSS J020834.37+291402.3"},{"catalog":"UGC","designation":"UGC 1632"}],"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."}