{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.667","julian_year":2026.667,"time":"2026-09-01T12:04:58.313Z","years_from_j2000":26.667,"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-560","name":"IC 560","class":"lenticular_galaxy_s0_a","category":"galaxy","object_type":"Lenticular galaxy S0-a","mag":14.38,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":102271797.08692423,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":146.47266666666667,"dec_deg":-0.2683055555555556,"epoch_ra_deg":146.816166,"epoch_dec_deg":-0.391874,"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":"Sextans","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-560","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.38,"h_mag":10.3,"j_mag":10.93,"k_mag":10.12,"redshift":0.006134,"hubble_type":"S0-a","wikidata_id":"Q3712336","redshift_cmb":0.007281252168785057,"ngc_type_code":"G","uncertainties":{"distance_ly":[14647045.511700446,14647045.511700446]},"major_axis_arcmin":1.41,"minor_axis_arcmin":0.54,"position_angle_deg":20,"surface_brightness":23.8,"radial_velocity_km_s":1833},"designations":[{"catalog":"2MASX","designation":"2MASX J09455343-0016055"},{"catalog":"IC","designation":"IC 560"},{"catalog":"LEDA","designation":"LEDA 27998"},{"catalog":"MCG","designation":"MCG +00-25-013"},{"catalog":"PGC","designation":"PGC 27998"},{"catalog":"SDSS","designation":"SDSS J094553.43-001605.9"},{"catalog":"TYC","designation":"TYC 4895-1899-1"},{"catalog":"UGC","designation":"UGC 5223"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-08-30T09:56:50.739Z","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."}