{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.686","julian_year":2026.686,"time":"2026-09-08T16:18:12.480Z","years_from_j2000":26.686,"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-4310","name":"NGC 4310","class":"lenticular_galaxy_s0_a","category":"galaxy","object_type":"Lenticular galaxy S0-a","mag":13.44,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":55699896.292054206,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":185.60958333333335,"dec_deg":29.209027777777777,"epoch_ra_deg":185.946773,"epoch_dec_deg":29.059956,"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":"Coma Berenices","discovered":"1785","featured":false,"url":"https://spacecatalog.org/object/ngc-4310","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.44,"h_mag":10.01,"j_mag":10.62,"k_mag":9.68,"redshift":0.003027,"hubble_type":"S0-a","wikidata_id":"Q3194569","redshift_cmb":0.00397549784481388,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14198925.142278712,14198925.142278712]},"major_axis_arcmin":1.93,"minor_axis_arcmin":0.76,"wikipedia_article":"NGC 4310","position_angle_deg":148,"surface_brightness":23.64,"radial_velocity_km_s":906},"designations":[{"catalog":"2MASX","designation":"2MASX J12222627+2912312"},{"catalog":"IRAS","designation":"IRAS 12199+2929"},{"catalog":"IRAS","designation":"IRAS F12199+2929"},{"catalog":"LEDA","designation":"LEDA 40086"},{"catalog":"MCG","designation":"MCG +05-29-074"},{"catalog":"NGC","designation":"NGC 4310"},{"catalog":"NGC","designation":"NGC 4311"},{"catalog":"PGC","designation":"PGC 40086"},{"catalog":"SDSS","designation":"SDSS J122226.29+291232.5"},{"catalog":"SDSS","designation":"SDSS J122226.30+291232.5"},{"catalog":"UGC","designation":"UGC 7440"}],"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."}