{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.684","julian_year":2026.684,"time":"2026-09-07T15:48:18.890Z","years_from_j2000":26.684,"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-7648","name":"NGC 7648","class":"lenticular_galaxy_s0","category":"galaxy","object_type":"Lenticular galaxy S0","mag":12.95,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":145927505.8213697,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":350.9750833333333,"dec_deg":9.667472222222221,"epoch_ra_deg":351.315002,"epoch_dec_deg":9.814917,"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":"1784","featured":false,"url":"https://spacecatalog.org/object/ngc-7648","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.75,"h_mag":10.01,"j_mag":10.72,"k_mag":9.7,"v_mag":12.95,"redshift":0.01161,"hubble_type":"S0","wikidata_id":"Q1168499","redshift_cmb":0.010365211339917302,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[15265689.959541023,15265689.959541023]},"major_axis_arcmin":1.56,"minor_axis_arcmin":0.98,"wikipedia_article":"NGC 7648","position_angle_deg":84,"surface_brightness":23.44,"radial_velocity_km_s":3461},"designations":[{"catalog":"2MASX","designation":"2MASX J23235403+0940028"},{"catalog":"IC","designation":"IC 1486"},{"catalog":"IRAS","designation":"IRAS 23213+0923"},{"catalog":"IRAS","designation":"IRAS F23213+0923"},{"catalog":"LEDA","designation":"LEDA 71321"},{"catalog":"MCG","designation":"MCG +01-59-072"},{"catalog":"NGC","designation":"NGC 7648"},{"catalog":"PGC","designation":"PGC 71321"},{"catalog":"UGC","designation":"UGC 12575"}],"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."}