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Stellar Occultation by (687170) 2011 QF99 on 2025-10-31 (01:13:36 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] : a9a94890-ddb8-11f0-547e-f36dffbb32f7 [observed] Occultation Date + Time : 2025-10-31 at 01:13:36 UT +/- 3.27 min [1] Object Designation : (687170) 2011 QF99 Star Designation : GDR3 3356641053499837824 Star Coordinates (ICRF) : RA = 06 27 07.6617, DE = +14 32 36.899 [2] Star Magnitudes : G = 14.05 mag, RP = 13.35 mag, BP = 14.6 mag Object Magnitude : V = 22.25 mag Estimated Magnitude Drop : 8.2 mag Estimated Max. Duration : 4.1 sec Speed of the shadow : 9.4 km/s Object Mean Diameter : 38.3 km (src: astorb) => apparent = 3 mas Apparent Motion : 0.0483 arcs/min @ PA = 243 deg Horizontal Parallax : 0.5400 arcs Dynamical Class : Elongation to Moon & Sun : 131° (sunlit = 64%), Sun = 121° Cross-track uncertainty : 73.0 mas = 862 km = 22.51 path-width (1-sig) RUWE and duplicate source : 1.05 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#13 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0


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