{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.679","julian_year":2026.679,"time":"2026-09-06T02:07:03.435Z","years_from_j2000":26.679,"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-7689","name":"NGC 7689","class":"intermediate_spiral_galaxy_sabc","category":"galaxy","object_type":"Intermediate spiral galaxy SABc","mag":10.84,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":83910920.62615423,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":353.3197083333333,"dec_deg":-54.09447222222222,"epoch_ra_deg":353.690327,"epoch_dec_deg":-53.946143,"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":"Phoenix","discovered":"1826","featured":false,"url":"https://spacecatalog.org/object/ngc-7689","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.13,"h_mag":9.41,"j_mag":10.2,"k_mag":9.06,"v_mag":10.84,"redshift":0.006578,"hubble_type":"SABc","wikidata_id":"Q1168712","redshift_cmb":0.0059799273969232125,"discovered_by":"James Dunlop","ngc_type_code":"G","uncertainties":{"distance_ly":[14442978.925814725,14442978.925814725]},"major_axis_arcmin":3.1,"minor_axis_arcmin":1.97,"wikipedia_article":"NGC 7689","position_angle_deg":141,"surface_brightness":22.95,"radial_velocity_km_s":1965},"designations":[{"catalog":"2MASX","designation":"2MASX J23331672-5405401"},{"catalog":"ESO","designation":"ESO 192-007"},{"catalog":"ESO","designation":"ESO 192-7"},{"catalog":"ESO-LV","designation":"ESO-LV 192-0070"},{"catalog":"IRAS","designation":"IRAS 23305-5422"},{"catalog":"IRAS","designation":"IRAS F23305-5422"},{"catalog":"LEDA","designation":"LEDA 71729"},{"catalog":"NGC","designation":"NGC 7689"},{"catalog":"PGC","designation":"PGC 71729"}],"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."}