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Stellar Occultation by (18710) 1998 HF100 on 2025-09-23 (19:52:39 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] : 6db05900-ddb8-11f0-547e-b3befbfb5e65 [observed]

 Occultation Date + Time   : 2025-09-23 at 19:52:39 UT +/- 0.02 min  [1]
 Object Designation        : (18710) 1998 HF100
 Star Designation          : GDR3 6857230233722686592
 Star Coordinates (ICRF)   : RA = 20 47 28.4326, DE = -20 12 48.902  [2]
 Star Magnitudes           : G = 11.96 mag, RP = 11.19 mag, BP = 12.59 mag
 Object Magnitude          : V = 18.9 mag
 Estimated Magnitude Drop  : 6.9 mag
 Estimated Max. Duration   : 2.7 sec
 Speed of the shadow       : 2.1 km/s
 Object Mean Diameter      : 5.6 km  (src: astorb) => apparent = 3 mas
 Apparent Motion           : 0.0767 arcs/min @ PA = 242 deg
 Horizontal Parallax       : 3.8960 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 105° (sunlit = 4%), Sun = 128°
 Cross-track uncertainty   : 0.3 mas = 0 km = 0.09 path-width (1-sig)
 RUWE and duplicate source : 1.18 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#57
 Note                      : FP:true

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


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