Sunday 19th of February 2017 ~ 20:49:36 UTC (216) Kleopatra occult TYC 5718-535-1(mag 10.3)


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  • 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

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event.2017-02-19.216_Kleopatra.prediction.2017-02-05

Event
Moon
  • Moon illumination : 40%
  • Moon phase : Last quarter
(216) Kleopatra
  • Mag : 13.1
  • Asteroid Diameter : 138 km
  • Geocentric distance : 3.630 AU
  • Number of satellite : 2
  • Max duration : 3.7 seconds
  • Mag drop : 2.3
  • Shadow velocity : 37.6 km/s
  • Ingress Earth : 2017-02-19 20h47
  • Egress Earth  : 2017-02-19 20h52
Occulted Star : TYC 5718-535-1
  • Used RA   :   19:00:13.3728 J2000
  • Used DEC : -13:33:43.643 J2000
  • Mv : 10.3
  • VizieR - Aladin
Alexhelios
  • Satellite : Alexhelios
  • Diameter : 9 km
  • Max duration : 0.2 sec
Timing compared the primary event date
  • Solution's offset : + 15 s
  • Minimum offset : + 11 s
  • Maximum offset : + 24 s
  • Total uncertainty on datation : 13 s
Position compared the primary event path
  • Theses values are positive to the North
  • Solution's offset = 18 km
  • Min-Max offset 1-σ = -135 ↔ 123 km
  • Min-Max offset 2-σ = -164 ↔ 133 km
  • Min-Max offset 3-σ = -188 ↔ 161 km
  • Size of uncertainty 1-σ error = 258 km
  • Size of uncertainty 2-σ error = 297 km
  • Size of uncertainty 3-σ error = 349 km
Cleoselene
  • Satellite : Cleoselene
  • Diameter : 7 km
  • Max duration : 0.2 sec
Timing compared the primary event date
  • Solution's offset : + 1 s
  • Minimum offset : - 10 s
  • Maximum offset : + 10 s
  • Total uncertainty on datation : 20 s
Position compared the primary event path
  • Theses values are positive to the North
  • Solution's offset = -39 km
  • Min-Max offset 1-σ = -85 ↔ 276 km
  • Min-Max offset 2-σ = -85 ↔ 408 km
  • Min-Max offset 3-σ = -110 ↔ 469 km
  • Size of uncertainty 1-σ error = 361 km
  • Size of uncertainty 2-σ error = 493 km
  • Size of uncertainty 3-σ error = 578 km
Historic
  • 2016-07-12 : Create prediction
  • 2017-02-05 : Update 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 for Cleoselene

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 2120191 orbits computed to the occultation date. Each orbit is classify throw its performance, given an accuracy in kilometer :
    • 1-σ error = 258 km
    • 2-σ error = 297 km
    • 3-σ error = 349 km

    Cleoselene

    Cleoselene
    This figure represent 6323393 orbits computed to the occultation date. Each orbit is classify throw its performance, given an accuracy in kilometer :
    • 1-σ error = 361 km
    • 2-σ error = 493 km
    • 3-σ error = 578 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)