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Stellar Occultation by (128215) 2003 SL77 on 2025-08-15 (20:44:09 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] : 40ca2a70-ddb7-11f0-547e-8b911f7b2466 [observed]

 Occultation Date + Time   : 2025-08-15 at 20:44:09 UT +/- 0.14 min  [1]
 Object Designation        : (128215) 2003 SL77
 Star Designation          : GDR3 4098690559115636096
 Star Coordinates (ICRF)   : RA = 18 41 57.2745, DE = -17 48 19.429  [2]
 Star Magnitudes           : G = 14.92 mag, RP = 14.21 mag, BP = 15.43 mag
 Object Magnitude          : V = 18.9 mag
 Estimated Magnitude Drop  : 4.0 mag
 Estimated Max. Duration   : 2.2 sec
 Speed of the shadow       : 1.4 km/s
 Object Mean Diameter      : 3.0 km  (src: astorb) => apparent = 3 mas
 Apparent Motion           : 0.0750 arcs/min @ PA = 292 deg
 Horizontal Parallax       : 5.9020 arcs
 Dynamical Class           : MBA
 Elongation to Moon & Sun  : 128° (sunlit = 54%), Sun = 136°
 Cross-track uncertainty   : 2.1 mas = 2 km = 0.76 path-width (1-sig)
 RUWE and duplicate source : 1.85 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#40
 Note                      : FP:true

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


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