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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       : JPL72
 Note                      : FP:true

 
 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0


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