{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.668","julian_year":2026.668,"time":"2026-09-01T23:48:54.250Z","years_from_j2000":26.668,"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-669","name":"NGC 669","class":"spiral_galaxy_sab","category":"galaxy","object_type":"Spiral galaxy Sab","mag":12.3,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":205265127.48404518,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":26.817291666666666,"dec_deg":35.56330555555555,"epoch_ra_deg":27.208468,"epoch_dec_deg":35.697516,"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":"1883","featured":false,"url":"https://spacecatalog.org/object/ngc-669","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.34,"h_mag":9.13,"j_mag":9.89,"k_mag":8.83,"v_mag":12.3,"redshift":0.01541,"hubble_type":"Sab","wikidata_id":"Q1038127","redshift_cmb":0.014534470669538946,"discovered_by":"Édouard Stephan","ngc_type_code":"G","uncertainties":{"distance_ly":[16373936.615598893,16373936.615598893]},"major_axis_arcmin":2.34,"minor_axis_arcmin":0.57,"wikipedia_article":"NGC 669","position_angle_deg":36,"surface_brightness":23.14,"radial_velocity_km_s":4583},"designations":[{"catalog":"2MASX","designation":"2MASX J01471616+3533478"},{"catalog":"IRAS","designation":"IRAS 01443+3519"},{"catalog":"LEDA","designation":"LEDA 6560"},{"catalog":"MCG","designation":"MCG +06-05-004"},{"catalog":"MCG","designation":"MCG 6-5-4"},{"catalog":"NGC","designation":"NGC 669"},{"catalog":"PGC","designation":"PGC 6560"},{"catalog":"UGC","designation":"UGC 1248"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}