{"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":"2026-08-31T22:36:04.718Z","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-4676","name":"IC 4676","class":"galaxy","category":"galaxy","object_type":"Galaxy","mag":15.59,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":290343544.78044504,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":270.7207916666667,"dec_deg":11.823138888888888,"epoch_ra_deg":271.033475,"epoch_dec_deg":11.823106,"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":"Ophiuchus","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-4676","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":15.59,"h_mag":12.81,"j_mag":13.56,"k_mag":12.34,"redshift":0.02077,"wikidata_id":"Q3682038","redshift_cmb":0.02046819235779762,"ngc_type_code":"G","uncertainties":{"distance_ly":[18393171.108792916,18393171.108792916]},"major_axis_arcmin":0.58,"minor_axis_arcmin":0.33,"position_angle_deg":76,"surface_brightness":23.27,"radial_velocity_km_s":6163},"designations":[{"catalog":"2MASX","designation":"2MASX J18025296+1149234"},{"catalog":"IC","designation":"IC 4676"},{"catalog":"LEDA","designation":"LEDA 61317"},{"catalog":"PGC","designation":"PGC 61317"}],"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."}