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Stellar Occultation by (38439) 1999 SQ4 on 2023-04-30 (21:34:50 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] : 94504b60-ddb3-11f0-547e-7e3bfb955a54 [observed]

 Occultation Date + Time   : 2023-04-30 at 21:34:50 UT +/- 0.0 min  [1]
 Object Designation        : (38439) 1999 SQ4
 Star Designation          : GDR3 3145025815799736064
 Star Coordinates (ICRF)   : RA = 07 43 55.5239, DE = +07 13 11.116  [2]
 Star Magnitudes           : G = 9.45 mag, RP = 8.51 mag, BP = 10.35 mag
 Object Magnitude          : V = 19.39 mag
 Estimated Magnitude Drop  : 10.0 mag
 Estimated Max. Duration   : 0.3 sec
 Speed of the shadow       : 23.5 km/s
 Object Mean Diameter      : 7.0 km  (src: astorb) => apparent = 3 mas
 Apparent Motion           : 0.6083 arcs/min @ PA = 82 deg
 Horizontal Parallax       : 2.7530 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 50° (sunlit = 77%), Sun = 77°
 Cross-track uncertainty   : 0.3 mas = 0 km = 0.10 path-width (1-sig)
 RUWE and duplicate source : 0.93 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL58
 Note                      : FP:true

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


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