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Stellar Occultation by (31822) 1999 SY4 on 2025-12-25 (17:04:24 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] : 7df906b0-d996-11f1-43f3-ed90a7bfa0a6 [observed]

 Occultation Date + Time   : 2025-12-25 at 17:04:24 UT +/- 0.01 min  [1]
 Object Designation        : (31822) 1999 SY4
 Star Designation          : GDR3 2578068348651309440
 Star Coordinates (ICRF)   : RA = 01 06 27.7861, DE = +08 14 36.843  [2]
 Star Magnitudes           : G = 13.38 mag, RP = 12.85 mag, BP = 13.74 mag
 Object Magnitude          : V = 18.21 mag
 Estimated Magnitude Drop  : 4.8 mag
 Estimated Max. Duration   : 1.4 sec
 Speed of the shadow       : 8.5 km/s
 Object Mean Diameter      : 11.4 km  (src: astorb) => apparent = 5 mas
 Apparent Motion           : 0.2400 arcs/min @ PA = 58 deg
 Horizontal Parallax       : 3.0070 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 40° (sunlit = 28%), Sun = 104°
 Cross-track uncertainty   : 0.8 mas = 1 km = 0.15 path-width (1-sig)
 RUWE and duplicate source : 2.7 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL71
 Note                      : FP:true

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


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