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Stellar Occultation by (282198) 2001 UM166 on 2023-08-19 (21:36:53 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] : f05c9850-ddb3-11f0-547e-4cbafd6fa2a3 [observed]

 Occultation Date + Time   : 2023-08-19 at 21:36:53 UT +/- 0.04 min  [1]
 Object Designation        : (282198) 2001 UM166
 Star Designation          : GDR3 2671285769087860608
 Star Coordinates (ICRF)   : RA = 21 37 10.8118, DE = -05 29 57.095  [2]
 Star Magnitudes           : G = 13.9 mag, RP = 13.36 mag, BP = 14.27 mag
 Object Magnitude          : V = 19.63 mag
 Estimated Magnitude Drop  : 5.7 mag
 Estimated Max. Duration   : 0.6 sec
 Speed of the shadow       : 16.3 km/s
 Object Mean Diameter      : 9.8 km  (src: astorb) => apparent = 3 mas
 Apparent Motion           : 0.3200 arcs/min @ PA = 252 deg
 Horizontal Parallax       : 2.0920 arcs
 Dynamical Class           : JTRO
 Elongation to Moon & Sun  : 139° (sunlit = 11%), Sun = 172°
 Cross-track uncertainty   : 5.3 mas = 16 km = 1.65 path-width (1-sig)
 RUWE and duplicate source : 0.98 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#39
 Note                      : FP:true

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


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