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Stellar Occultation by (4857) Altgamia on 2025-10-19 (22:25:31 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] : 9622f640-ddb8-11f0-547e-d6c3f3b7f0fb [observed]

 Occultation Date + Time   : 2025-10-19 at 22:25:31 UT +/- 0.0 min  [1]
 Object Designation        : (4857) Altgamia
 Star Designation          : GDR3 2387582460264745728
 Star Coordinates (ICRF)   : RA = 23 42 45.2485, DE = -22 28 55.880  [2]
 Star Magnitudes           : G = 12.57 mag, RP = 12.11 mag, BP = 12.87 mag
 Object Magnitude          : V = 17.97 mag
 Estimated Magnitude Drop  : 5.4 mag
 Estimated Max. Duration   : 0.6 sec
 Speed of the shadow       : 13.6 km/s
 Object Mean Diameter      : 7.6 km  (src: astorb) => apparent = 5 mas
 Apparent Motion           : 0.5400 arcs/min @ PA = 296 deg
 Horizontal Parallax       : 4.2220 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 150° (sunlit = 2%), Sun = 136°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.14 path-width (1-sig)
 RUWE and duplicate source : 1.18 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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