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Stellar Occultation by (54) Alexandra on 2026-02-18 (21:36:10 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] : 4c7a0f20-de6b-11f0-4858-afbeceb507df [asteroids]

 Occultation Date + Time   : 2026-02-18 at 21:36:10 UT +/- 0.01 min  [1]
 Object Designation        : (54) Alexandra
 Star Designation          : GDR3 0610642782104949248
 Star Coordinates (ICRF)   : RA = 08 56 27.6193, DE = +15 54 46.497  [2]
 Star Magnitudes           : G = 11.15 mag, RP = 10.44 mag, BP = 11.52 mag
 Object Magnitude          : V = 12.69 mag
 Estimated Magnitude Drop  : 1.8 mag
 Estimated Max. Duration   : 11.4 sec
 Speed of the shadow       : 14.6 km/s
 Object Mean Diameter      : 165.8 km  (src: astorb) => apparent = 101 mas
 Apparent Motion           : 0.5367 arcs/min @ PA = 275 deg
 Horizontal Parallax       : 3.9000 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 145° (sunlit = 2%), Sun = 162°
 Cross-track uncertainty   : 1.4 mas = 2 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 2.72 mas, dup.src = 1  (0:false, 1:true)

 Ephemeris Reference       : JPL#210
 Note                      : FP:true

 Object is a <Gaia mass determination> target !

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


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