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Stellar Occultation by (171) Ophelia on 2023-07-21 (21:21:18 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] : 5dab10c0-ddb0-11f0-547e-20877dff223b [observed]

 Occultation Date + Time   : 2023-07-21 at 21:21:18 UT +/- 0.01 min  [1]
 Object Designation        : (171) Ophelia
 Star Designation          : GDR3 4116871911616485504
 Star Coordinates (ICRF)   : RA = 17 42 16.2269, DE = -23 04 27.188  [2]
 Star Magnitudes           : G = 14.62 mag, RP = 13.3 mag, BP = 16.6 mag
 Object Magnitude          : V = 13.73 mag
 Estimated Magnitude Drop  : 0.4 mag
 Estimated Max. Duration   : 13.4 sec
 Speed of the shadow       : 8.7 km/s
 Object Mean Diameter      : 116.7 km  (src: astorb) => apparent = 67 mas
 Apparent Motion           : 0.3017 arcs/min @ PA = 267 deg
 Horizontal Parallax       : 3.6830 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 102° (sunlit = 15%), Sun = 147°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 0.99 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#157
 Note                      : FP:true

 Object is a <Gaia mass determination> target !

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


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