{"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":"2026-09-02T21:32:35.310Z","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":"ic-1680","name":"IC 1680","class":"lenticular_galaxy_s0_a","category":"galaxy","object_type":"Lenticular galaxy S0-a","mag":14.86,"mag_band":"B","abs_mag":null,"abs_mag_band":null,"distance_ly":195042614.71094263,"distance_method":"redshift (CMB frame), flat ΛCDM with H0 = 70 km/s/Mpc","ra_deg":20.463333333333335,"dec_deg":33.2825,"epoch_ra_deg":20.840641,"epoch_dec_deg":33.423186,"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":"Pisces","discovered":null,"featured":false,"url":"https://spacecatalog.org/object/ic-1680","radius_km":null,"radius_kind":null,"data_quality":null,"description":null,"properties":{"b_mag":14.86,"h_mag":11.32,"j_mag":11.94,"k_mag":11,"redshift":0.014777,"hubble_type":"S0-a","wikidata_id":"Q3694146","redshift_cmb":0.01381803007782767,"ngc_type_code":"G","uncertainties":{"distance_ly":[16163251.140121419,16163251.140121419]},"major_axis_arcmin":0.7,"minor_axis_arcmin":0.53,"position_angle_deg":103,"surface_brightness":23.01,"radial_velocity_km_s":4397},"designations":[{"catalog":"2MASX","designation":"2MASX J01215113+3316573"},{"catalog":"IC","designation":"IC 1680"},{"catalog":"LEDA","designation":"LEDA 4956"},{"catalog":"MCG","designation":"MCG +05-04-028"},{"catalog":"PGC","designation":"PGC 4956"}],"source":{"id":"openngc","name":"OpenNGC","url":"https://github.com/mattiaverga/OpenNGC","license":"CC-BY-SA-4.0"},"updated_at":"2026-09-02T19:50:56.720Z","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."}