{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T06:19:25.410Z","years_from_j2000":26.669,"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-585","name":"NGC 585","class":"barred_spiral_galaxy_sba","category":"galaxy","object_type":"Barred spiral galaxy SBa","mag":14.07,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":241117154.32490048,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":22.925583333333332,"dec_deg":-0.9333055555555555,"epoch_ra_deg":23.268734,"epoch_dec_deg":-0.794912,"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":"1827","featured":false,"url":"https://spacecatalog.org/object/ngc-585","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.07,"h_mag":9.68,"j_mag":10.48,"k_mag":9.37,"redshift":0.01806,"hubble_type":"SBa","wikidata_id":"Q613827","redshift_cmb":0.01704120703739531,"discovered_by":"John Frederick William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[17170524.4467157,17170524.4467157]},"major_axis_arcmin":2.4,"minor_axis_arcmin":0.48,"wikipedia_article":"NGC 585","position_angle_deg":86,"surface_brightness":24.1,"radial_velocity_km_s":5365},"designations":[{"catalog":"2MASX","designation":"2MASX J01314210-0055584"},{"catalog":"IRAS","designation":"IRAS 01291-0111"},{"catalog":"IRAS","designation":"IRAS F01291-0111"},{"catalog":"LEDA","designation":"LEDA 5688"},{"catalog":"MCG","designation":"MCG +00-05-001"},{"catalog":"NGC","designation":"NGC 585"},{"catalog":"PGC","designation":"PGC 5688"},{"catalog":"SDSS","designation":"SDSS J013142.11-005559.0"},{"catalog":"SDSS","designation":"SDSS J013142.11-005559.1"},{"catalog":"SDSS","designation":"SDSS J013142.13-005559.9"},{"catalog":"SDSS","designation":"SDSS J013142.14-005559.9"},{"catalog":"UGC","designation":"UGC 1092"}],"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."}