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Stellar Occultation by (3906) Chao on 2025-04-04 (19:42:13 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] : 608daf90-ddb6-11f0-547e-d529cfc9a2af [observed]

 Occultation Date + Time   : 2025-04-04 at 19:42:13 UT +/- 0.0 min  [1]
 Object Designation        : (3906) Chao
 Star Designation          : GDR3 3321264404311736576
 Star Coordinates (ICRF)   : RA = 05 48 47.2546, DE = +06 01 33.137  [2]
 Star Magnitudes           : G = 13.54 mag, RP = 12.7 mag, BP = 14.27 mag
 Object Magnitude          : V = 16.43 mag
 Estimated Magnitude Drop  : 3.0 mag
 Estimated Max. Duration   : 1.7 sec
 Speed of the shadow       : 27.8 km/s
 Object Mean Diameter      : 47.1 km  (src: astorb) => apparent = 21 mas
 Apparent Motion           : 0.7383 arcs/min @ PA = 62 deg
 Horizontal Parallax       : 2.8270 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 27° (sunlit = 47%), Sun = 73°
 Cross-track uncertainty   : 0.3 mas = 0 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.02 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#71
 Note                      : FP:true

 Object is a <TNOs are Cool> target !

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


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