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Stellar Occultation by (4138) Kalchas on 2023-04-08 (19:11:17 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] : 8a09fc00-ddb3-11f0-547e-9e54ebc71799 [observed] Occultation Date + Time : 2023-04-08 at 19:11:17 UT +/- 0.01 min [1] Object Designation : (4138) Kalchas Star Designation : GDR3 3402956709507255808 Star Coordinates (ICRF) : RA = 05 39 04.6765, DE = +21 31 25.327 [2] Star Magnitudes : G = 13.36 mag, RP = 12.78 mag, BP = 13.76 mag Object Magnitude : V = 18.04 mag Estimated Magnitude Drop : 4.7 mag Estimated Max. Duration : 1.3 sec Speed of the shadow : 24.4 km/s Object Mean Diameter : 32.0 km (src: astorb) => apparent = 8 mas Apparent Motion : 0.3700 arcs/min @ PA = 86 deg Horizontal Parallax : 1.6170 arcs Dynamical Class : JTRO Elongation to Moon & Sun : 145° (sunlit = 93%), Sun = 66° Cross-track uncertainty : 0.1 mas = 0 km = 0.01 path-width (1-sig) RUWE and duplicate source : 1.06 mas, dup.src = 0 (0:false, 1:true) Ephemeris Reference : JPL#71 Note : FP:true [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0


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