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Stellar Occultation by (177) Irma on 2025-01-02 (18:33:21 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] : e02a25d0-825e-11ef-6618-e967ffdd2335 [asteroids]

 Occultation Date + Time   : 2025-01-02 at 18:33:21 UT +/- 0.0 min  [1]
 Object Designation        : (177) Irma
 Star Designation          : GDR3 2614706584349855104
 Star Coordinates (ICRF)   : RA = 22 14 51.6133, DE = -10 46 08.911  [2]
 Star Magnitudes           : G = 13.44 mag, RP = 12.97 mag, BP = 13.75 mag
 Object Magnitude          : V = 14.52 mag
 Estimated Magnitude Drop  : 1.4 mag
 Estimated Max. Duration   : 1.9 sec
 Object Mean Diameter      : 73 km  (src: astorb)
 Orbital Class             : MBA
 Speed of the shadow       : 39.5 km/s
 Elongation to Moon & Sun  : 14° (sunlit = 9%), Sun = 49°
 Cross-track uncertainty   : 1.3 mas = 2 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 1.0 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#121

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


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