{"release":{"id":"DR1","released_on":"2026-08-21","doi":null,"url":"https://spacecatalog.org/releases#dr1"},"epoch":{"requested":"now","label":"J2026.665","julian_year":2026.665,"time":"2026-08-31T18:05:04.744Z","years_from_j2000":26.665,"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-2017","name":"IC 2017","class":"lenticular_galaxy_s0","category":"galaxy","object_type":"Lenticular galaxy S0","mag":15,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":262017949.17181054,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":59.16404166666667,"dec_deg":-59.39475,"epoch_ra_deg":59.293264,"epoch_dec_deg":-59.316291,"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":"Reticulum","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-2017","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15,"h_mag":11.07,"j_mag":11.88,"k_mag":10.69,"redshift":0.018572,"hubble_type":"S0","wikidata_id":"Q3693281","redshift_cmb":0.01849834129803085,"ngc_type_code":"G","uncertainties":{"distance_ly":[17672816.739532743,17672816.739532743]},"major_axis_arcmin":1.11,"minor_axis_arcmin":0.74,"position_angle_deg":21,"surface_brightness":23.88,"radial_velocity_km_s":5516},"designations":[{"catalog":"2MASX","designation":"2MASX J03563937-5923413"},{"catalog":"ESO","designation":"ESO 117-015"},{"catalog":"ESO","designation":"ESO 117-15"},{"catalog":"ESO-LV","designation":"ESO-LV 117-0150"},{"catalog":"IC","designation":"IC 2017"},{"catalog":"IRAS","designation":"IRAS 03557-5932"},{"catalog":"IRAS","designation":"IRAS F03557-5932"},{"catalog":"LEDA","designation":"LEDA 14140"},{"catalog":"PGC","designation":"PGC 14140"}],"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."}