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Stellar Occultation by (21254) Jonan on 2025-09-25 (23:27:31 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] : 761d7b90-ddb8-11f0-547e-dc499ffdc9cd [observed]

 Occultation Date + Time   : 2025-09-25 at 23:27:31 UT +/- 0.0 min  [1]
 Object Designation        : (21254) Jonan
 Star Designation          : GDR3 0321609320083977472
 Star Coordinates (ICRF)   : RA = 01 20 31.4880, DE = +36 52 46.743  [2]
 Star Magnitudes           : G = 12.69 mag, RP = 12.01 mag, BP = 13.23 mag
 Object Magnitude          : V = 17.55 mag
 Estimated Magnitude Drop  : 4.9 mag
 Estimated Max. Duration   : 0.6 sec
 Speed of the shadow       : 11.9 km/s
 Object Mean Diameter      : 7.1 km  (src: astorb) => apparent = 6 mas
 Apparent Motion           : 0.5583 arcs/min @ PA = 295 deg
 Horizontal Parallax       : 4.9760 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 154° (sunlit = 15%), Sun = 141°
 Cross-track uncertainty   : 1.0 mas = 1 km = 0.18 path-width (1-sig)
 RUWE and duplicate source : 1.03 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#63
 Note                      : FP:true

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


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