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Stellar Occultation by (199) Byblis on 2026-04-24 (01:45:37 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] : 7d67a2b0-33bf-11f1-6999-c38aecdd9b3e [asteroids]

 Occultation Date + Time   : 2026-04-24 at 01:45:37 UT +/- 0.07 min  [1]
 Object Designation        : (199) Byblis
 Star Designation          : GDR3 4095898349272345600
 Star Coordinates (ICRF)   : RA = 18 11 30.4416, DE = -17 51 13.685  [2]
 Star Magnitudes           : G = 13.27 mag, RP = 12.6 mag, BP = 13.77 mag
 Object Magnitude          : V = 13.0 mag
 Estimated Magnitude Drop  : 0.6 mag
 Estimated Max. Duration   : 12.8 sec
 Speed of the shadow       : 4.9 km/s
 Object Mean Diameter      : 63.0 km  (src: astorb) => apparent = 45 mas
 Apparent Motion           : 0.2100 arcs/min @ PA = 131 deg
 Horizontal Parallax       : 4.5450 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 148° (sunlit = 50%), Sun = 121°
 Cross-track uncertainty   : 3.0 mas = 4 km = 0.07 path-width (1-sig)
 RUWE and duplicate source : 1.41 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#147
 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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