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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 : JPL#64 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0


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