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Stellar Occultation by (6857) Castelli on 2025-10-03 (20:54:12 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] : 80869530-ddb8-11f0-547e-02547f2d36b3 [observed]

 Occultation Date + Time   : 2025-10-03 at 20:54:12 UT +/- 0.0 min  [1]
 Object Designation        : (6857) Castelli
 Star Designation          : GDR3 6877079712842870528
 Star Coordinates (ICRF)   : RA = 20 03 22.2145, DE = -16 18 38.141  [2]
 Star Magnitudes           : G = 12.12 mag, RP = 11.12 mag, BP = 13.14 mag
 Object Magnitude          : V = 18.06 mag
 Estimated Magnitude Drop  : 6.0 mag
 Estimated Max. Duration   : 0.4 sec
 Speed of the shadow       : 11.1 km/s
 Object Mean Diameter      : 4.8 km  (src: astorb) => apparent = 4 mas
 Apparent Motion           : 0.5800 arcs/min @ PA = 69 deg
 Horizontal Parallax       : 5.5730 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 28° (sunlit = 86%), Sun = 109°
 Cross-track uncertainty   : 1.0 mas = 1 km = 0.24 path-width (1-sig)
 RUWE and duplicate source : 1.05 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#65
 Note                      : FP:true

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


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