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Stellar Occultation by (100687) 1997 YF4 on 2026-08-14 (18:59:27 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] : d9099710-d9ad-11f1-43f3-f66abdce949e [observed]

 Occultation Date + Time   : 2026-08-14 at 18:59:27 UT +/- 0.01 min  [1]
 Object Designation        : (100687) 1997 YF4
 Star Designation          : GDR3 4078693977294054656
 Star Coordinates (ICRF)   : RA = 18 51 28.1188, DE = -22 17 26.855  [2]
 Star Magnitudes           : G = 12.89 mag, RP = 12.04 mag, BP = 13.66 mag
 Object Magnitude          : V = 19.78 mag
 Estimated Magnitude Drop  : 6.9 mag
 Estimated Max. Duration   : 0.5 sec
 Speed of the shadow       : 5.8 km/s
 Object Mean Diameter      : 2.9 km  (src: astorb) => apparent = 2 mas
 Apparent Motion           : 0.2500 arcs/min @ PA = 254 deg
 Horizontal Parallax       : 4.6050 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 113° (sunlit = 5%), Sun = 140°
 Cross-track uncertainty   : 0.7 mas = 0 km = 0.33 path-width (1-sig)
 RUWE and duplicate source : 0.95 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL44
 Note                      : FP:true

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


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