{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.664","julian_year":2026.664,"time":"2026-08-31T13:10:13.409Z","years_from_j2000":26.664,"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-9","name":"NGC 9","class":"spiral_galaxy_sb","category":"galaxy","object_type":"Spiral galaxy Sb","mag":14.59,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":196552142.28553432,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":2.2279166666666668,"dec_deg":23.816972222222223,"epoch_ra_deg":2.57363,"epoch_dec_deg":23.966393,"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":"Pegasus","discovered":"1865","featured":false,"url":"https://spacecatalog.org/object/ngc-9","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.59,"h_mag":11.95,"j_mag":12.69,"k_mag":11.78,"redshift":0.015087,"hubble_type":"Sb","wikidata_id":"Q33912","redshift_cmb":0.013923872248484459,"discovered_by":"Otto Wilhelm von Struve","ngc_type_code":"G","uncertainties":{"distance_ly":[16193876.302597817,16193876.302597817]},"major_axis_arcmin":0.7,"minor_axis_arcmin":0.31,"wikipedia_article":"NGC 9","position_angle_deg":149,"surface_brightness":22.64,"radial_velocity_km_s":4489},"designations":[{"catalog":"2MASX","designation":"2MASX J00085471+2349009"},{"catalog":"IRAS","designation":"IRAS 00063+2332"},{"catalog":"IRAS","designation":"IRAS F00063+2332"},{"catalog":"LEDA","designation":"LEDA 652"},{"catalog":"MCG","designation":"MCG +04-01-030"},{"catalog":"NGC","designation":"NGC 9"},{"catalog":"PGC","designation":"PGC 652"},{"catalog":"UGC","designation":"UGC 78"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}