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Stellar Occultation by (177) Irma on 2026-01-21 (18:35:13 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] : bec8c120-de6b-11f0-4858-77d3f9f94d3a [asteroids]

 Occultation Date + Time   : 2026-01-21 at 18:35:13 UT +/- 0.01 min  [1]
 Object Designation        : (177) Irma
 Star Designation          : GDR3 0869475618943664512
 Star Coordinates (ICRF)   : RA = 07 21 22.8154, DE = +23 55 00.441  [2]
 Star Magnitudes           : G = 13.9 mag, RP = 13.27 mag, BP = 14.08 mag
 Object Magnitude          : V = 13.14 mag
 Estimated Magnitude Drop  : 0.4 mag
 Estimated Max. Duration   : 6.9 sec
 Speed of the shadow       : 10.6 km/s
 Object Mean Diameter      : 73.2 km  (src: astorb) => apparent = 62 mas
 Apparent Motion           : 0.5433 arcs/min @ PA = 275 deg
 Horizontal Parallax       : 5.4420 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 132° (sunlit = 9%), Sun = 167°
 Cross-track uncertainty   : 3.1 mas = 3 km = 0.05 path-width (1-sig)
 RUWE and duplicate source : 16.59 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#131
 Note                      : FP:true

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


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