{"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":"2026-09-03T16:41:25.307Z","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-5248","name":"NGC 5248","class":"intermediate_spiral_galaxy_sabb","category":"galaxy","object_type":"Intermediate spiral galaxy SABb","mag":9.97,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":67250144.9704943,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":204.38341666666668,"dec_deg":8.885166666666667,"epoch_ra_deg":204.718165,"epoch_dec_deg":8.748235,"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":"Boötes","discovered":"1784","featured":false,"url":"https://spacecatalog.org/object/ngc-5248","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":10.88,"h_mag":7.46,"j_mag":8.18,"k_mag":7.25,"v_mag":9.97,"redshift":0.003843,"hubble_type":"SABb","wikidata_id":"Q754717","redshift_cmb":0.004796890215097882,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14288432.91896912,14288432.91896912]},"major_axis_arcmin":4.07,"minor_axis_arcmin":2.38,"wikipedia_article":"NGC 5248","position_angle_deg":120,"surface_brightness":22.25,"radial_velocity_km_s":1150},"designations":[{"catalog":"2MASX","designation":"2MASX J13373206+0853062"},{"catalog":"Caldwell","designation":"C 45"},{"catalog":"IRAS","designation":"IRAS 13350+0908"},{"catalog":"IRAS","designation":"IRAS 13353+0908"},{"catalog":"IRAS","designation":"IRAS F13350+0908"},{"catalog":"LEDA","designation":"LEDA 48130"},{"catalog":"MCG","designation":"MCG +02-35-015"},{"catalog":"NGC","designation":"NGC 5248"},{"catalog":"PGC","designation":"PGC 48130"},{"catalog":"SDSS","designation":"SDSS J133732.02+085306.6"},{"catalog":"UGC","designation":"UGC 8616"}],"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."}