{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.670","julian_year":2026.67,"time":"2026-09-02T19:31:44.244Z","years_from_j2000":26.67,"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-4348","name":"NGC 4348","class":"spiral_galaxy_sbc","category":"galaxy","object_type":"Spiral galaxy Sbc","mag":12.28,"mag_band":"V","abs_mag":null,"abs_mag_band":null,"distance_ly":110789667.51256636,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":185.97495833333332,"dec_deg":-3.442916666666667,"epoch_ra_deg":186.319823,"epoch_dec_deg":-3.591782,"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":"Virgo","discovered":"1786","featured":false,"url":"https://spacecatalog.org/object/ngc-4348","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.11,"h_mag":9.27,"j_mag":9.98,"k_mag":8.91,"v_mag":12.28,"redshift":0.006705,"hubble_type":"Sbc","wikidata_id":"Q1110870","redshift_cmb":0.007884094217831983,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14753345.1590106,14753345.1590106]},"major_axis_arcmin":2.67,"minor_axis_arcmin":0.5,"position_angle_deg":31,"surface_brightness":22.77,"radial_velocity_km_s":2003},"designations":[{"catalog":"2MASX","designation":"2MASX J12235396-0326344"},{"catalog":"IRAS","designation":"IRAS 12213-0310"},{"catalog":"IRAS","designation":"IRAS F12213-0310"},{"catalog":"LEDA","designation":"LEDA 40284"},{"catalog":"MCG","designation":"MCG +00-32-003"},{"catalog":"NGC","designation":"NGC 4348"},{"catalog":"PGC","designation":"PGC 40284"},{"catalog":"SDSS","designation":"SDSS J122353.76-032635.2"},{"catalog":"SDSS","designation":"SDSS J122353.98-032634.5"},{"catalog":"SDSS","designation":"SDSS J122353.99-032634.5"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T18:38:07.546Z","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."}