{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.677","julian_year":2026.677,"time":"2026-09-05T07:22:03.766Z","years_from_j2000":26.677,"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-622","name":"NGC 622","class":"spiral_galaxy_sb","category":"galaxy","object_type":"Spiral galaxy Sb","mag":13.28,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":229090492.918238,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":24.000666666666667,"dec_deg":0.6635277777777778,"epoch_ra_deg":24.345564,"epoch_dec_deg":0.800883,"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":"Cetus","discovered":"1785","featured":false,"url":"https://spacecatalog.org/object/ngc-622","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.05,"h_mag":10.76,"j_mag":11.41,"k_mag":10.41,"v_mag":13.28,"redshift":0.01721,"hubble_type":"Sb","wikidata_id":"Q1037724","redshift_cmb":0.01620134094542025,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[16893741.731836844,16893741.731836844]},"major_axis_arcmin":1.3,"minor_axis_arcmin":0.83,"wikipedia_article":"NGC 622","position_angle_deg":55,"surface_brightness":23.17,"radial_velocity_km_s":5115},"designations":[{"catalog":"2MASX","designation":"2MASX J01360013+0039481"},{"catalog":"IRAS","designation":"IRAS 01334+0024"},{"catalog":"IRAS","designation":"IRAS F01334+0024"},{"catalog":"LEDA","designation":"LEDA 5939"},{"catalog":"MCG","designation":"MCG +00-05-014"},{"catalog":"NGC","designation":"NGC 622"},{"catalog":"PGC","designation":"PGC 5939"},{"catalog":"SDSS","designation":"SDSS J013600.15+003948.6"},{"catalog":"SDSS","designation":"SDSS J013600.15+003948.7"},{"catalog":"SDSS","designation":"SDSS J013600.16+003948.7"},{"catalog":"UGC","designation":"UGC 1143"}],"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."}