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Stellar Occultation by (99148) 2001 FO121 on 2025-08-25 (00:22:09 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] : 5115eb30-ddb7-11f0-547e-97f4df5f0a06 [observed]

 Occultation Date + Time   : 2025-08-25 at 00:22:09 UT +/- 0.04 min  [1]
 Object Designation        : (99148) 2001 FO121
 Star Designation          : GDR3 2520616495278044928
 Star Coordinates (ICRF)   : RA = 02 17 31.6374, DE = +06 49 07.296  [2]
 Star Magnitudes           : G = 13.74 mag, RP = 13.08 mag, BP = 14.25 mag
 Object Magnitude          : V = 19.52 mag
 Estimated Magnitude Drop  : 5.8 mag
 Estimated Max. Duration   : 1.0 sec
 Speed of the shadow       : 3.6 km/s
 Object Mean Diameter      : 3.6 km  (src: astorb) => apparent = 2 mas
 Apparent Motion           : 0.1483 arcs/min @ PA = 32 deg
 Horizontal Parallax       : 4.3310 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 138° (sunlit = 3%), Sun = 117°
 Cross-track uncertainty   : 2.3 mas = 3 km = 0.94 path-width (1-sig)
 RUWE and duplicate source : 1.07 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#48
 Note                      : FP:true

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


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