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Stellar Occultation by (539796) 2017 BB56 on 2026-09-23 (02:17:00 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] : 61df29d0-d9b1-11f1-43f3-f5c3def7473a [observed]

 Occultation Date + Time   : 2026-09-23 at 02:17:00 UT +/- 0.49 min  [1]
 Object Designation        : (539796) 2017 BB56
 Star Designation          : GDR3 0158720756942875264
 Star Coordinates (ICRF)   : RA = 04 47 15.0105, DE = +30 54 40.367  [2]
 Star Magnitudes           : G = 12.64 mag, RP = 11.88 mag, BP = 13.26 mag
 Object Magnitude          : V = 20.98 mag
 Estimated Magnitude Drop  : 8.3 mag
 Estimated Max. Duration   : 1.6 sec
 Speed of the shadow       : 4.5 km/s
 Object Mean Diameter      : 7.1 km  (src: astorb) => apparent = 2 mas
 Apparent Motion           : 0.0783 arcs/min @ PA = 68 deg
 Horizontal Parallax       : 1.8700 arcs
 Dynamical Class           : JTRO
 Elongation to Moon & Sun  : 117° (sunlit = 86%), Sun = 106°
 Cross-track uncertainty   : 22.0 mas = 75 km = 10.57 path-width (1-sig)
 RUWE and duplicate source : 0.93 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL24
 Note                      : FP:true

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


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