Saturday 1st of March 2014 ~ 16:19:11 UTC (90482) Orcus occult 4U 409-49830(mag 11.7)


  • Download the Google Earth File KMZ
  • green line is the central line of (90482) Orcus
  • blue lines show the estimate size of (90482) Orcus
  • red lines the 1-sigma error for the path
  • white lines show Vanth

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event.2014-03-01.90482_Orcus.prediction.2016-11-07

Event
  • Max duration : 35.4 seconds
  • Mag drop : 7.4
  • Shadow velocity : 26.1 km/s
  • Ingress Earth : 2014-03-01 16h15
  • Egress Earth  : 2014-03-01 16h24
  • Moon illumination : 0%
  • Moon phase : New Moon
Asteroidal system
  • Name : (90482) Orcus
  • Mag : 19.1
  • Asteroid Diameter : 926 km
  • Geocentric distance : 47.083 AU
  • Number of satellite : 1
  • Satellite : Vanth
  • Diameter : 276 km
  • Max duration : 10.6 sec
Occulted Star
  • Name : 4U 409-49830
  • Used RA   :   09:58:22.5482 J2000
  • Used DEC : -08:16:55.339 J2000
  • Mv : 11.7
  • VizieR - Aladin
Historic
Prediction for (90482) Orcus and Vanth (wide views)

Orcus

Orcus

Orcus

Orcus

Vanth

Vanth
Ephemerides from IMCCE

Ephemeris for (90482) Orcus

Ephemeris for Vanth

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

Orbitography for the (90482) Orcus system

Vanth

Vanth

Astrometric observations centered on (90482) Orcus.
Dot represents one observed position. The vector shows ephemeris position from observed position.

Vanth

Vanth

Geometry of orbit for the (90482) Orcus system view from Earth
  • Cyan circle show the position of the satellite Vanth at the occultation date.
  • The black dots show next positions during almost a period
  • In the center, (90482) Orcus 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

    Vanth

    Vanth
    This figure represent 1783936 orbits computed to the occultation date. Each orbit is classify throw its performance, given an accuracy in kilometer :
    • 1-σ error = 3138 km
    • 2-σ error = 3966 km
    • 3-σ error = 5690 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)