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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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