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Stellar Occultation by (86) Semele on 2025-09-22 (03:12:47 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] : 7c101db0-ddb7-11f0-547e-08cafd3d2f37 [observed]

 Occultation Date + Time   : 2025-09-22 at 03:12:47 UT +/- 0.0 min  [1]
 Object Designation        : (86) Semele
 Star Designation          : GDR3 0661416240507239424
 Star Coordinates (ICRF)   : RA = 08 41 29.3269, DE = +20 04 45.028  [2]
 Star Magnitudes           : G = 14.68 mag, RP = 14.2 mag, BP = 14.99 mag
 Object Magnitude          : V = 14.44 mag
 Estimated Magnitude Drop  : 0.6 mag
 Estimated Max. Duration   : 3.5 sec
 Speed of the shadow       : 34.6 km/s
 Object Mean Diameter      : 120.6 km  (src: astorb) => apparent = 50 mas
 Apparent Motion           : 0.8600 arcs/min @ PA = 102 deg
 Horizontal Parallax       : 2.6440 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 55° (sunlit = 0%), Sun = 52°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.04 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#141
 Note                      : FP:true

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


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