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Stellar Occultation by (18744) 1999 AU on 2023-12-30 (19:31:11 UT)

CTU: Cross-track uncertainty (zero means: use the nominal prediction value, see event details below). Offsets and CTU all in mas.


Event Details
Occultation UUID [and db] : 51900490-ddb4-11f0-547e-f58717f1c524 [observed] Occultation Date + Time : 2023-12-30 at 19:31:11 UT +/- 0.0 min [1] Object Designation : (18744) 1999 AU Star Designation : GDR3 0187110529428102016 Star Coordinates (ICRF) : RA = 05 16 25.8943, DE = +36 48 58.660 [2] Star Magnitudes : G = 11.03 mag, RP = 10.84 mag, BP = 11.12 mag Object Magnitude : V = 17.65 mag Estimated Magnitude Drop : 6.6 mag Estimated Max. Duration : 0.5 sec Speed of the shadow : 12.9 km/s Object Mean Diameter : 5.8 km (src: astorb) => apparent = 5 mas Apparent Motion : 0.6317 arcs/min @ PA = 246 deg Horizontal Parallax : 5.2210 arcs Dynamical Class : MBA Elongation to Moon & Sun : 61° (sunlit = 87%), Sun = 158° Cross-track uncertainty : 0.2 mas = 0 km = 0.04 path-width (1-sig) RUWE and duplicate source : 0.97 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#62 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0


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