{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.675","julian_year":2026.675,"time":"2026-09-04T15:36:57.787Z","years_from_j2000":26.675,"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-2648","name":"NGC 2648","class":"spiral_galaxy_sa","category":"galaxy","object_type":"Spiral galaxy Sa","mag":11.88,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":106753826.3992949,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":130.66583333333332,"dec_deg":14.28561111111111,"epoch_ra_deg":131.039015,"epoch_dec_deg":14.189543,"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":"Cancer","discovered":"1784","featured":false,"url":"https://spacecatalog.org/object/ngc-2648","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":12.86,"h_mag":8.94,"j_mag":9.61,"k_mag":8.66,"v_mag":11.88,"redshift":0.006685,"hubble_type":"Sa","wikidata_id":"Q1050121","redshift_cmb":0.007598530224462996,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14702077.5849758,14702077.5849758]},"major_axis_arcmin":3.15,"minor_axis_arcmin":1.08,"wikipedia_article":"NGC 2648","position_angle_deg":151,"surface_brightness":23.61,"radial_velocity_km_s":1997},"designations":[{"catalog":"2MASX","designation":"2MASX J08423982+1417078"},{"catalog":"IRAS","designation":"IRAS 08398+1427"},{"catalog":"LEDA","designation":"LEDA 24464"},{"catalog":"MCG","designation":"MCG +02-22-005"},{"catalog":"NGC","designation":"NGC 2648"},{"catalog":"PGC","designation":"PGC 24464"},{"catalog":"SDSS","designation":"SDSS J084239.80+141708.2"},{"catalog":"UGC","designation":"UGC 4541"}],"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."}