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Stellar Occultation by (418) Alemannia on 2025-09-17 (18:45:20 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] : 3d972ea0-85a9-11ef-78cd-f8d5effee179 [asteroids]

 Occultation Date + Time   : 2025-09-17 at 18:45:20 UT +/- 0.01 min  [1]
 Object Designation        : (418) Alemannia
 Star Designation          : GDR3 4099882494079529344
 Star Coordinates (ICRF)   : RA = 18 39 36.4870, DE = -16 19 15.856  [2]
 Star Magnitudes           : G = 13.37 mag, RP = 12.42 mag, BP = 14.29 mag
 Object Magnitude          : V = 14.36 mag
 Estimated Magnitude Drop  : 1.4 mag
 Estimated Max. Duration   : 3.5 sec
 Object Mean Diameter      : 34.1 km  (src: astorb)
 Orbital Class             : MBA
 Speed of the shadow       : 9.8 km/s
 Elongation to Moon & Sun  : 150° (sunlit = 16%), Sun = 104°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 1.02 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#103

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


More Data and Informations
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