2025-12-25 / UCAC4 492-001663 / (31822) 1999 SY4
# OBS Observer Occ Meth. Instr. CC
TSRC UT1 UT2 UT3 UT4 UT2E UT3E Dur. Chrd
1
show Sven Andersson
O+
VID
M360
DE
GPS
17:07:06
17:07:34.037
17:07:36.437
17:08:06
0.124
0.124
2.40
20.4
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km |
More 1 observation found in db: sodis
Available (probably) matching predictions (click on the link to switch):
Using prediction 7df906b0-d996-11f1-43f3-ed90a7bfa0a6 for map and profile fit
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Event Details
Occultation UUID [and DB] : 7df906b0-d996-11f1-43f3-ed90a7bfa0a6 [observed]
Occultation Date + Time : 2025-12-25 at 17:04:24 UT +/- 0.01 min [1]
Object Designation : (31822) 1999 SY4
Orbit Class : MBA
Star Designation : GDR3 2578068348651309440
Star Coordinates (ICRF) : RA = 01 06 27.7861, DE = +08 14 36.843 [2]
Star Magnitudes : G = 13.38 mag, RP = 12.85 mag, BP = 13.74 mag
Object Magnitude : V = 18.21 mag
Estimated Magnitude Drop : 4.8 mag
Estimated Max. Duration : 1.4 sec
Object Mean Diameter : 11.4 km (src: astorb)
Speed of the shadow : 8.5 km/s
Elongation to Moon & Sun : 40° (sunlit = 28%), Sun = 104°
Cross-track uncertainty : 0.8 mas = 1 km = 0.15 path-width (1-sig)
RUWE and duplicate source : 2.7 mas, dup.src = 0 (0:false, 1:true)
Ephemeris Reference : JPL71
Note : FP:true
[1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0
(If error 404: link not valid which means no data available)
