{"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":"2026-09-02T13:49:38.058Z","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-4356","name":"NGC 4356","class":"spiral_galaxy_sc","category":"galaxy","object_type":"Spiral galaxy Sc","mag":13.41,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":68969337.60191116,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":186.06054166666667,"dec_deg":8.53586111111111,"epoch_ra_deg":186.402482,"epoch_dec_deg":8.38702,"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":"1785","featured":false,"url":"https://spacecatalog.org/object/ngc-4356","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":13.41,"h_mag":9.95,"j_mag":10.67,"k_mag":9.69,"redshift":0.003786,"hubble_type":"Sc","wikidata_id":"Q1110914","redshift_cmb":0.0049190630773747746,"discovered_by":"William Herschel","ngc_type_code":"G","uncertainties":{"distance_ly":[14303001.199276732,14303001.199276732]},"major_axis_arcmin":2.01,"minor_axis_arcmin":0.73,"position_angle_deg":40,"surface_brightness":22.81,"radial_velocity_km_s":1133},"designations":[{"catalog":"2MASX","designation":"2MASX J12241453+0832088"},{"catalog":"IC","designation":"IC 3273"},{"catalog":"IRAS","designation":"IRAS 12217+0848"},{"catalog":"IRAS","designation":"IRAS F12216+0848"},{"catalog":"LEDA","designation":"LEDA 40342"},{"catalog":"MCG","designation":"MCG +02-32-026"},{"catalog":"NGC","designation":"NGC 4356"},{"catalog":"PGC","designation":"PGC 40342"},{"catalog":"UGC","designation":"UGC 7482"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-01T22:58:55.274Z","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."}