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Stellar Occultation by (5550) 1981 UB1 on 2025-11-25 (22:39:47 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] : c757b3e0-ddb8-11f0-547e-21beaf7e6fef [observed] Occultation Date + Time : 2025-11-25 at 22:39:47 UT +/- 0.01 min [1] Object Designation : (5550) 1981 UB1 Star Designation : GDR3 3423620243843923712 Star Coordinates (ICRF) : RA = 06 03 50.9344, DE = +21 51 02.209 [2] Star Magnitudes : G = 14.71 mag, RP = 14.01 mag, BP = 15.25 mag Object Magnitude : V = 16.08 mag Estimated Magnitude Drop : 1.6 mag Estimated Max. Duration : 1.6 sec Speed of the shadow : 7.1 km/s Object Mean Diameter : 11.6 km (src: astorb) => apparent = 10 mas Apparent Motion : 0.3617 arcs/min @ PA = 270 deg Horizontal Parallax : 5.4450 arcs Dynamical Class : MBA Elongation to Moon & Sun : 144° (sunlit = 27%), Sun = 153° Cross-track uncertainty : 0.4 mas = 0 km = 0.04 path-width (1-sig) RUWE and duplicate source : 1.12 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#72 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0


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