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Stellar Occultation by (18744) 1999 AU on 2023-12-30 (19:31:11 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] : 51900490-ddb4-11f0-547e-f58717f1c524 [observed]

 Occultation Date + Time   : 2023-12-30 at 19:31:11 UT +/- 0.0 min  [1]
 Object Designation        : (18744) 1999 AU
 Star Designation          : GDR3 0187110529428102016
 Star Coordinates (ICRF)   : RA = 05 16 25.8943, DE = +36 48 58.660  [2]
 Star Magnitudes           : G = 11.03 mag, RP = 10.84 mag, BP = 11.12 mag
 Object Magnitude          : V = 17.65 mag
 Estimated Magnitude Drop  : 6.6 mag
 Estimated Max. Duration   : 0.5 sec
 Speed of the shadow       : 12.9 km/s
 Object Mean Diameter      : 5.8 km  (src: astorb) => apparent = 5 mas
 Apparent Motion           : 0.6317 arcs/min @ PA = 246 deg
 Horizontal Parallax       : 5.2210 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 61° (sunlit = 87%), Sun = 158°
 Cross-track uncertainty   : 0.2 mas = 0 km = 0.04 path-width (1-sig)
 RUWE and duplicate source : 0.97 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL62
 Prediction generated      : 2025-12-20 14:58:18 UTC
 Note                      : FP:true

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


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