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Stellar Occultation by (91856) 1999 UB13 on 2026-07-17 (01:39:35 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] : b09b9510-d9aa-11f1-43f3-13f8fcf899e2 [observed]

 Occultation Date + Time   : 2026-07-17 at 01:39:35 UT +/- 0.01 min  [1]
 Object Designation        : (91856) 1999 UB13
 Star Designation          : GDR3 4289249874225954944
 Star Coordinates (ICRF)   : RA = 19 30 23.4139, DE = +03 23 04.921  [2]
 Star Magnitudes           : G = 11.89 mag, RP = 11.56 mag, BP = 12.09 mag
 Object Magnitude          : V = 18.81 mag
 Estimated Magnitude Drop  : 6.9 mag
 Estimated Max. Duration   : 0.3 sec
 Speed of the shadow       : 10.6 km/s
 Object Mean Diameter      : 3.4 km  (src: astorb) => apparent = 3 mas
 Apparent Motion           : 0.5283 arcs/min @ PA = 265 deg
 Horizontal Parallax       : 5.3110 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 137° (sunlit = 10%), Sun = 155°
 Cross-track uncertainty   : 1.7 mas = 2 km = 0.60 path-width (1-sig)
 RUWE and duplicate source : 1.02 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL46
 Note                      : FP:true

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


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