{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.669","julian_year":2026.669,"time":"2026-09-02T09:47:18.738Z","years_from_j2000":26.669,"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":"ic-4856","name":"IC 4856","class":"irregular_galaxy_ib","category":"galaxy","object_type":"Irregular galaxy IB","mag":14.47,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":152354484.0093587,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":291.87720833333333,"dec_deg":-54.90852777777778,"epoch_ra_deg":292.419301,"epoch_dec_deg":-54.854312,"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":"Telescopium","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-4856","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.47,"redshift":0.011092,"hubble_type":"IB","wikidata_id":"Q3680950","redshift_cmb":0.010818036772032968,"ngc_type_code":"G","uncertainties":{"distance_ly":[15371651.791617336,15371651.791617336]},"major_axis_arcmin":1.17,"minor_axis_arcmin":0.57,"position_angle_deg":29,"surface_brightness":22.96,"radial_velocity_km_s":3307},"designations":[{"catalog":"ESO","designation":"ESO 184-069"},{"catalog":"ESO","designation":"ESO 184-69"},{"catalog":"ESO-LV","designation":"ESO-LV 184-0690"},{"catalog":"IC","designation":"IC 4856"},{"catalog":"IRAS","designation":"IRAS F19234-5500"},{"catalog":"LEDA","designation":"LEDA 63226"},{"catalog":"PGC","designation":"PGC 63226"}],"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."}