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Stellar Occultation by (91854) 1999 UA9 on 2025-09-30 (19:39:11 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] : 7a9b1470-ddb8-11f0-547e-92b7a7f7b23c [observed]

 Occultation Date + Time   : 2025-09-30 at 19:39:11 UT +/- 0.01 min  [1]
 Object Designation        : (91854) 1999 UA9
 Star Designation          : GDR3 2476062218240795392
 Star Coordinates (ICRF)   : RA = 01 05 32.8342, DE = -06 59 49.278  [2]
 Star Magnitudes           : G = 11.32 mag, RP = 10.86 mag, BP = 11.62 mag
 Object Magnitude          : V = 18.87 mag
 Estimated Magnitude Drop  : 7.6 mag
 Estimated Max. Duration   : 0.3 sec
 Speed of the shadow       : 11.6 km/s
 Object Mean Diameter      : 3.5 km  (src: astorb) => apparent = 3 mas
 Apparent Motion           : 0.5367 arcs/min @ PA = 260 deg
 Horizontal Parallax       : 4.9270 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 84° (sunlit = 58%), Sun = 166°
 Cross-track uncertainty   : 1.7 mas = 2 km = 0.63 path-width (1-sig)
 RUWE and duplicate source : 1.09 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL41
 Note                      : FP:true

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


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