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Stellar Occultation by (138940) 2001 BO23 on 2025-08-13 (22:33:28 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] : 3d6fb4d0-ddb7-11f0-547e-a27947abed58 [observed]

 Occultation Date + Time   : 2025-08-13 at 22:33:28 UT +/- 0.06 min  [1]
 Object Designation        : (138940) 2001 BO23
 Star Designation          : GDR3 2590225167683155584
 Star Coordinates (ICRF)   : RA = 01 21 51.3083, DE = +13 48 08.342  [2]
 Star Magnitudes           : G = 13.64 mag, RP = 12.69 mag, BP = 13.66 mag
 Object Magnitude          : V = 19.95 mag
 Estimated Magnitude Drop  : 6.3 mag
 Estimated Max. Duration   : 0.6 sec
 Speed of the shadow       : 3.7 km/s
 Object Mean Diameter      : 2.1 km  (src: astorb) => apparent = 2 mas
 Apparent Motion           : 0.1967 arcs/min @ PA = 37 deg
 Horizontal Parallax       : 5.5870 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 3° (sunlit = 75%), Sun = 117°
 Cross-track uncertainty   : 3.0 mas = 3 km = 1.63 path-width (1-sig)
 RUWE and duplicate source : 1.4 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL49
 Note                      : FP:true

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


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