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Stellar Occultation by (74517) 1999 FU31 on 2025-12-01 (04:50:59 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] : c9e4c760-ddb8-11f0-547e-b9592f78eb79 [observed]

 Occultation Date + Time   : 2025-12-01 at 04:50:59 UT +/- 0.01 min  [1]
 Object Designation        : (74517) 1999 FU31
 Star Designation          : GDR3 3104759500969647488
 Star Coordinates (ICRF)   : RA = 06 31 52.6308, DE = -04 12 51.302  [2]
 Star Magnitudes           : G = 10.43 mag, RP = 10.09 mag, BP = 10.64 mag
 Object Magnitude          : V = 17.98 mag
 Estimated Magnitude Drop  : 7.6 mag
 Estimated Max. Duration   : 0.5 sec
 Speed of the shadow       : 11.2 km/s
 Object Mean Diameter      : 6.0 km  (src: astorb) => apparent = 5 mas
 Apparent Motion           : 0.5133 arcs/min @ PA = 220 deg
 Horizontal Parallax       : 4.8760 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 85° (sunlit = 80%), Sun = 140°
 Cross-track uncertainty   : 0.4 mas = 0 km = 0.09 path-width (1-sig)
 RUWE and duplicate source : 1.39 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL54
 Prediction generated      : 2025-12-20 15:30:17 UTC
 Note                      : FP:true

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


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