Tuesday 4th of July 2017 ~ 12:50:17 UTC (216) Kleopatra occult 4UC 454-106611(mag 12.5)


  • Download the Google Earth File KMZ
  • green line is the central line of (216) Kleopatra
  • blue lines show the estimate size of (216) Kleopatra
  • red lines the 1-sigma error for the path
  • white lines show AlexHelios
Event
  • Max duration : 12.8 seconds
  • Mag drop : 0.31
  • Shadow velocity : 9.5 km/s
  • Ingress Earth : 2017-07-04 12h42
  • Egress Earth  : 2017-07-04 12h59
  • Moon illumination : 82%
  • Moon phase : Waxing gibbous
Asteroidal system
  • Name : (216) Kleopatra
  • Mag : 11.3
  • Asteroid Diameter : 122 km
  • Geocentric distance : 1.787 AU
  • Number of satellite : 2
  • Satellite : AlexHelios
  • Diameter : 9 km
  • Max duration : 0.9 sec
  • Satellite : CleoSelene
  • Diameter : 7 km
  • Max duration : 0.7 sec
Occulted Star
  • Name : 4UC 454-106611
  • Used RA   :   20:15:31.3287 J2000
  • Used DEC : +00:40:41.539 J2000
  • Mv : 12.5
  • VizieR - Aladin
Historic
  • 2016-07-12 : Create prediction
Prediction for (216) Kleopatra and AlexHelios (wide views)

Kleopatra

Kleopatra

Kleopatra

Kleopatra

AlexHelios

AlexHelios

AlexHelios

AlexHelios

CleoSelene

CleoSelene

CleoSelene

CleoSelene
Ephemerides from IMCCE

Ephemeris for (216) Kleopatra

Ephemeris for AlexHelios

Ephemeris from Miriade for the date of occultation and geocenter frame. For more specific ephemeris please use the documentation of Miriade.

Orbitography for the (216) Kleopatra system

AlexHelios

AlexHelios

Astrometric observations centered on (216) Kleopatra.
Dot represents one observed position. The vector shows ephemeris position from observed position.

AlexHelios

AlexHelios

Geometry of orbit for the (216) Kleopatra system view from Earth
  • Cyan circle show the position of the satellite AlexHelios at the occultation date.
  • The black dots show next positions during almost a period
  • In the center, (216) Kleopatra represented by an ellipsoid

    • CleoSelene

    CleoSelene

    Astrometric observations centered on (216) Kleopatra.
    Dot represents one observed position. The vector shows ephemeris position from observed position.

    CleoSelene

    CleoSelene

    Geometry of orbit for the (216) Kleopatra system view from Earth
  • Cyan circle show the position of the satellite CleoSelene at the occultation date.
  • The black dots show next positions during almost a period
  • In the center, (216) Kleopatra represented by an ellipsoid
    • Propagation of the solutions
    We use all orbits from 1,2 and 3 sigma issued from Genetical algorithm, and we see where the satellite is for the occultation date. North on top, and East on right.
    • Center at coordinates 0,0 is Primary
    • Black dots show the orbit with the best solution at the date of occultation
    • Green zone show orbits covering 1-sigma error
    • Blue zone for 2-sigma
    • Red zone for 3-sigma

    Alexhelios

    Alexhelios
    This figure represent 2120974 orbits computed to the occultation date. Each orbit is classify throw its performance, given an accuracy in kilometer :
    • 1-σ error = 338 km
    • 2-σ error = 438 km
    • 3-σ error = 920 km

    Cleoselene

    Cleoselene
    This figure represent 6264523 orbits computed to the occultation date. Each orbit is classify throw its performance, given an accuracy in kilometer :
    • 1-σ error = 390 km
    • 2-σ error = 428 km
    • 3-σ error = 525 km
    Contents
    • Orbital solution fitted by Genoid project (Vachier F., Berthier J., Carry B. & Pajuelo M.) IMCCE/CNRS
    • Ephemeris has made available with Miriade Project (Berthier J. & Vachier F.) IMCCE/CNRS
    • Occultation Prediction by Vachier F. using Occult (Occultation Prediction Software by D.Herald)
    • Ephemeris and offset based on ASTORB (Edward Bowell)