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Stellar Occultation by (16979) 1999 AO4 on 2026-07-23 (22:09:39 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] : 72b14050-d9ab-11f1-43f3-1259fb430394 [observed]

 Occultation Date + Time   : 2026-07-23 at 22:09:39 UT +/- 0.11 min  [1]
 Object Designation        : (16979) 1999 AO4
 Star Designation          : GDR3 4136034371987652864
 Star Coordinates (ICRF)   : RA = 17 15 46.3453, DE = -16 28 41.751  [2]
 Star Magnitudes           : G = 14.72 mag, RP = 13.92 mag, BP = 15.37 mag
 Object Magnitude          : V = 16.79 mag
 Estimated Magnitude Drop  : 2.2 mag
 Estimated Max. Duration   : 1.1 sec
 Speed of the shadow       : 5.9 km/s
 Object Mean Diameter      : 6.3 km  (src: astorb) => apparent = 7 mas
 Apparent Motion           : 0.3883 arcs/min @ PA = 187 deg
 Horizontal Parallax       : 6.9550 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 24° (sunlit = 73%), Sun = 138°
 Cross-track uncertainty   : 1.7 mas = 1 km = 0.25 path-width (1-sig)
 RUWE and duplicate source : 1.11 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL58
 Note                      : FP:true

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


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