Friday, the 16 of April, 2021 ~ 06:29:54 UTC (136108) Haumea occult UCAC4 531-055209 (mag 12.44)


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  • Legend for each body
    • green line is the central line
    • blue lines show the estimate size
    • red lines the 1-sigma error for the path
Event
  • Date : Friday, the 16 of April, 2021 ~ 06:29:54 UTC
  • Max duration : 116.8 seconds
  • Shadow velocity : 25.7 km/s
  • Barycenter prediction : NIMAv72020Oct21
Asteroidal system
  • Name : (136108) Haumea
  • Mag : 17.28
  • Geocentric distance : 49.3714 AU
  • Number of Components : 3
  • Component : Haumea
  • Diameter : 1380.0 km
  • Max duration : 53.4 sec
  • Component : Hiiaka
  • Diameter : 320.0 km
  • Max duration : 12.4 sec
  • Component : Namaka
  • Diameter : 160.0 km
  • Max duration : 6.2 sec
Occulted Star
  • Name : UCAC4 531-055209
  • Used RA   :   14h23m52s5 J2000
  • Used DEC : +16d10m40s2 J2000
  • Mb : 13.39
  • Mv : 12.44
  • Mr : 11.92
  • VizieR - Aladin
Historic
  • 2020-10-22 : Create prediction
  • here the same prediction by Josselin Desmars from LESIA
Prediction for (136108) Haumea system. (wide views)

Haumea

Haumea

Hiiaka

Hiiaka

Hiiaka

Hiiaka

Namaka

Namaka
Ephemerides from IMCCE

Ephemeris for Haumea

Ephemeris for Hiiaka

Ephemeris for Namaka

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

Orbitography for the (136108) Haumea system

Hiiaka

Hiiaka

Astrometric observations of Hiiaka centered on (136108) Haumea.
Dot represents one observed position. The vector shows ephemeris position from observed position.

Namaka

Namaka

Astrometric observations of Namaka centered on (136108) Haumea.
Dot represents one observed position. The vector shows ephemeris position from observed position.

All components on the tangent plane

Namaka
Propagation of the solutions

We use all the orbits at 1, 2 and 3-σ uncertainties to predict the location of the satellite (relatively to the primary) at the epoch of the occultation. The figure is oriented with North up and East right.

  • The primary is centered at coordinates 0,0, and the arrow shows the direction of the motion of the shadow
  • The black dots show the best orbit at the date of the occultation
  • The green, blue and red dots represent the positions of the satellite within, respectively, 1, 2 and 3-σ uncertainties

Hiiaka

Hiiaka
This figure displays the orbits of the components of the system at the date of the occultation. Positive x are toward East, and positive y are toward North. Probable positions of the components are displayed with colors depending of its uncertainty: green for 1-σ, blue for 2-σ and red for 3-σ. The largest region where the component should be located is, in kilometers:
  • 1-σ error = 1562 km
  • 2-σ error = 1595 km
  • 3-σ error = 1900 km

Accuracy for timing

The date of the event presented at the top of this page concerns the barycenter of the system. The occultation by the satellite, however, does not occur exactly at this date. If we consider all the 3-σ uncertainties, we can define a time span of the probable occurring of the event. A negative value corresponds to a time prior the date of the main event.

1-σ 2-σ 3-σ
Minimum time offset -219 sec -222 sec -226 sec
Maximum time offset -160 sec -155 sec -154 sec

Accuracy for position

The black arrow shows the direction of the motion of the shadow. The uncertainty of the position of the satellite at the time of the occultation is defined by the clusters of green (1-σ), blue (2-σ) and red (3-σ) dots. The green lines materialize the lower and upper limits of the 1-σ cluster in the direction of the motion of the shadow. The following table shows the uncertainties on the position of the satellite relatively to its best predicted position. A positive value indicates an offset on the position toward : South/South-West

1-σ 2-σ 3-σ
Minimum orthogonal projection -813 km -826 km -1105 km
Maximum orthogonal projection 749 km 769 km 794 km

More graphics

Namaka

Namaka
This figure displays the orbits of the components of the system at the date of the occultation. Positive x are toward East, and positive y are toward North. Probable positions of the components are displayed with colors depending of its uncertainty: green for 1-σ, blue for 2-σ and red for 3-σ. The largest region where the component should be located is, in kilometers:
  • 1-σ error = 1614 km
  • 2-σ error = 1614 km
  • 3-σ error = 1820 km

Accuracy for timing

The date of the event presented at the top of this page concerns the barycenter of the system. The occultation by the satellite, however, does not occur exactly at this date. If we consider all the 3-σ uncertainties, we can define a time span of the probable occurring of the event. A negative value corresponds to a time prior the date of the main event.

1-σ 2-σ 3-σ
Minimum time offset -127 sec -129 sec -130 sec
Maximum time offset -86 sec -83 sec -81 sec

Accuracy for position

The black arrow shows the direction of the motion of the shadow. The uncertainty of the position of the satellite at the time of the occultation is defined by the clusters of green (1-σ), blue (2-σ) and red (3-σ) dots. The green lines materialize the lower and upper limits of the 1-σ cluster in the direction of the motion of the shadow. The following table shows the uncertainties on the position of the satellite relatively to its best predicted position. A positive value indicates an offset on the position toward : South/South-West

1-σ 2-σ 3-σ
Minimum orthogonal projection -853 km -853 km -934 km
Maximum orthogonal projection 761 km 761 km 886 km

More graphics

Contents
  • Orbital solution fitted by Genoid project (Vachier F., Berthier J., Carry B.) 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 for the barycenter are based on NIMA