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Stellar Occultation by (109701) 2001 RY40 on 2025-12-30 (21:43:27 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] : 0c966cf0-d997-11f1-43f3-d542fcbbff25 [observed]

 Occultation Date + Time   : 2025-12-30 at 21:43:27 UT +/- 0.01 min  [1]
 Object Designation        : (109701) 2001 RY40
 Star Designation          : GDR3 0189360920492546432
 Star Coordinates (ICRF)   : RA = 05 41 48.4471, DE = +37 26 47.069  [2]
 Star Magnitudes           : G = 11.11 mag, RP = 10.62 mag, BP = 11.4 mag
 Object Magnitude          : V = 18.63 mag
 Estimated Magnitude Drop  : 7.5 mag
 Estimated Max. Duration   : 0.3 sec
 Speed of the shadow       : 11.8 km/s
 Object Mean Diameter      : 3.9 km  (src: astorb) => apparent = 3 mas
 Apparent Motion           : 0.5517 arcs/min @ PA = 277 deg
 Horizontal Parallax       : 4.9790 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 37° (sunlit = 83%), Sun = 161°
 Cross-track uncertainty   : 1.3 mas = 1 km = 0.43 path-width (1-sig)
 RUWE and duplicate source : 1.25 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL39
 Note                      : FP:true

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


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