{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.673","julian_year":2026.673,"time":"2026-09-03T19:45:42.867Z","years_from_j2000":26.673,"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-7309","name":"NGC 7309","class":"intermediate_spiral_galaxy_sabc","category":"galaxy","object_type":"Intermediate spiral galaxy SABc","mag":12.5,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":173099854.24309537,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":338.5857916666667,"dec_deg":-10.357,"epoch_ra_deg":338.940073,"epoch_dec_deg":-10.218487,"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":"Aquarius","discovered":"1785","featured":false,"url":"https://spacecatalog.org/object/ngc-7309","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.04,"h_mag":10.04,"j_mag":10.69,"k_mag":9.68,"v_mag":12.5,"redshift":0.013455,"hubble_type":"SABc","wikidata_id":"Q747867","redshift_cmb":0.012277621166517427,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15737877.735687189,15737877.735687189]},"major_axis_arcmin":2.08,"minor_axis_arcmin":1.86,"position_angle_deg":120,"surface_brightness":23.28,"radial_velocity_km_s":4006},"designations":[{"catalog":"2MASX","designation":"2MASX J22342056-1021253"},{"catalog":"IRAS","designation":"IRAS 22317-1036"},{"catalog":"IRAS","designation":"IRAS F22317-1036"},{"catalog":"LEDA","designation":"LEDA 69183"},{"catalog":"MCG","designation":"MCG -02-57-016"},{"catalog":"NGC","designation":"NGC 7309"},{"catalog":"PGC","designation":"PGC 69183"}],"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."}