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Stellar Occultation by (128) Nemesis on 2026-02-19 (05:04:10 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] : 923e0390-de6b-11f0-4858-519efab7f40b [asteroids]

 Occultation Date + Time   : 2026-02-19 at 05:04:10 UT +/- 0.0 min  [1]
 Object Designation        : (128) Nemesis
 Star Designation          : GDR3 4065620822786587776
 Star Coordinates (ICRF)   : RA = 18 16 42.5979, DE = -23 29 45.239  [2]
 Star Magnitudes           : G = 10.62 mag, RP = 9.89 mag, BP = 11.19 mag
 Object Magnitude          : V = 13.48 mag
 Estimated Magnitude Drop  : 2.9 mag
 Estimated Max. Duration   : 5.6 sec
 Speed of the shadow       : 33.7 km/s
 Object Mean Diameter      : 188.2 km  (src: astorb) => apparent = 78 mas
 Apparent Motion           : 0.8383 arcs/min @ PA = 92 deg
 Horizontal Parallax       : 2.6430 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 78° (sunlit = 3%), Sun = 57°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 0.97 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#142
 Note                      : FP:true

 Object is a <Gaia mass determination> target !

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


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