{"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":"2026-09-04T00:43:25.920Z","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-6822","name":"Barnard's Galaxy","class":"irregular_galaxy_ib","category":"galaxy","object_type":"Irregular galaxy IB","mag":10.05,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":null,"distance_method":null,"ra_deg":296.24058333333335,"dec_deg":-14.803444444444445,"epoch_ra_deg":296.620226,"epoch_dec_deg":-14.738953,"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":"Sagittarius","discovered":"1884","featured":false,"url":"https://spacecatalog.org/object/ngc-6822","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":9.36,"h_mag":6.92,"j_mag":7.48,"k_mag":6.72,"v_mag":10.05,"redshift":-0.00019,"hubble_type":"IB","wikidata_id":"Q622789","redshift_cmb":-0.0008854909739159922,"discovered_by":"Edward Emerson Barnard","ngc_type_code":"G","major_axis_arcmin":17.38,"minor_axis_arcmin":16.75,"wikipedia_article":"NGC 6822","position_angle_deg":27,"surface_brightness":24.25,"radial_velocity_km_s":-57},"designations":[{"catalog":"2MASX","designation":"2MASX J19445619-1447512"},{"catalog":"Caldwell","designation":"C 57"},{"catalog":"Common name","designation":"Barnard's Galaxy"},{"catalog":"IC","designation":"IC 4895"},{"catalog":"IRAS","designation":"IRAS 19420-1450"},{"catalog":"IRAS","designation":"IRAS 19421-1455"},{"catalog":"LEDA","designation":"LEDA 63616"},{"catalog":"MCG","designation":"MCG -02-50-006"},{"catalog":"NGC","designation":"NGC 6822"},{"catalog":"PGC","designation":"PGC 63616"}],"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."}