UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km |
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1 observation found in db: euraster
Available (probably) matching predictions (click on the link to switch):
Occultation UUID [and DB] : 642d1877-e4d0-4a99-8f57-45423a4a4c60 [observed]
Occultation Date + Time : 2017-09-28 at 18:57:56 UT +/- 0.0 min [1]
Object Designation : (101) Helena
Orbit Class : MBA
Star Designation : GDR3 4046360432696825856
Star Coordinates (ICRF) : RA = 18 23 01.2915, DE = -30 56 48.523 [2]
Star Magnitudes : G = 11.88 mag, RP = 11.11 mag, BP = 12.52 mag
Object Magnitude : V = 12.71 mag
Estimated Magnitude Drop : 1.2 mag
Estimated Max. Duration : 3.3 sec
Object Mean Diameter : 66 km (src: astorb)
Speed of the shadow : 19.8 km/s
Elongation to Moon & Sun : 14° (sunlit = 56%), Sun = 89°
Cross-track uncertainty : 1.3 mas = 1 km = 0.03 path-width (1-sig)
RUWE and duplicate source : 0.73 mas, dup.src = 0 (0:false, 1:true)
Ephemeris Reference : JPL#125
[1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0