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Stellar Occultation by (387556) 2001 QW99 on 2023-08-24 (22:53:49 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] : f8d098b0-ddb3-11f0-547e-0061efbe4d78 [observed] Occultation Date + Time : 2023-08-24 at 22:53:49 UT +/- 0.07 min [1] Object Designation : (387556) 2001 QW99 Star Designation : GDR3 1798490449662782592 Star Coordinates (ICRF) : RA = 21 27 50.0485, DE = +24 48 30.826 [2] Star Magnitudes : G = 14.2 mag, RP = 13.46 mag, BP = 14.81 mag Object Magnitude : V = 19.64 mag Estimated Magnitude Drop : 5.4 mag Estimated Max. Duration : 0.3 sec Speed of the shadow : 11.1 km/s Object Mean Diameter : 2.9 km (src: astorb) => apparent = 2 mas Apparent Motion : 0.4933 arcs/min @ PA = 264 deg Horizontal Parallax : 4.7220 arcs Dynamical Class : MBA Elongation to Moon & Sun : 89° (sunlit = 56%), Sun = 143° Cross-track uncertainty : 29.0 mas = 39 km = 13.51 path-width (1-sig) RUWE and duplicate source : 1.04 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#25 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0


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