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Stellar Occultation by (387556) 2001 QW99 on 2023-08-24 (22:53:49 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] : f8d098b0-ddb3-11f0-547e-0061efbe4d78 [observed]

 Occultation Date + Time   : 2023-08-24 at 22:53:49 UT +/- 0.07 min  [1]
 Object Designation        : (387556) 2001 QW99
 Star Designation          : GDR3 1798490449662782592
 Star Coordinates (ICRF)   : RA = 21 27 50.0485, DE = +24 48 30.826  [2]
 Star Magnitudes           : G = 14.2 mag, RP = 13.46 mag, BP = 14.81 mag
 Object Magnitude          : V = 19.64 mag
 Estimated Magnitude Drop  : 5.4 mag
 Estimated Max. Duration   : 0.3 sec
 Speed of the shadow       : 11.1 km/s
 Object Mean Diameter      : 2.9 km  (src: astorb) => apparent = 2 mas
 Apparent Motion           : 0.4933 arcs/min @ PA = 264 deg
 Horizontal Parallax       : 4.7220 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 89° (sunlit = 56%), Sun = 143°
 Cross-track uncertainty   : 29.0 mas = 39 km = 13.51 path-width (1-sig)
 RUWE and duplicate source : 1.04 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#25
 Note                      : FP:true

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


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