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Stellar Occultation by (54883) 2001 OS57 on 2025-10-01 (21:18:59 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] : 9b64f090-ddb8-11f0-547e-4dfdc35af822 [observed]

 Occultation Date + Time   : 2025-10-01 at 21:18:59 UT +/- 0.01 min  [1]
 Object Designation        : (54883) 2001 OS57
 Star Designation          : GDR3 2632615597245990400
 Star Coordinates (ICRF)   : RA = 23 29 23.7429, DE = -05 37 21.621  [2]
 Star Magnitudes           : G = 12.14 mag, RP = 11.54 mag, BP = 12.57 mag
 Object Magnitude          : V = 18.15 mag
 Estimated Magnitude Drop  : 6.0 mag
 Estimated Max. Duration   : 0.5 sec
 Speed of the shadow       : 10.9 km/s
 Object Mean Diameter      : 5.5 km  (src: astorb) => apparent = 4 mas
 Apparent Motion           : 0.4683 arcs/min @ PA = 251 deg
 Horizontal Parallax       : 4.5740 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 50° (sunlit = 69%), Sun = 162°
 Cross-track uncertainty   : 1.7 mas = 2 km = 0.43 path-width (1-sig)
 RUWE and duplicate source : 0.98 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL64
 Note                      : FP:true

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


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