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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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