Tuesday, the 08 of February, 2022 ~ 10:33:46 UTC (3749) Balam occult UCAC4 555-038725 (mag 10.80)


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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 : Tuesday, the 08 of February, 2022 ~ 10:33:46 UTC
  • Max duration : 6.58 seconds
  • Shadow velocity : 4.9 km/s
  • Barycenter prediction : JPL#75:2021-Nov-09
  • Genoide's reference solution : 2021-11-27T10:09:20.333 (Fomc:34.26 mas)
Asteroidal system
  • Name : (3749) Balam
  • Mag : 15.91
  • Geocentric distance : 1.0864 AU
  • Number of Components : 2
  • Component : Balam
  • Diameter : 14.0 km
  • Max duration : 2.88 sec
  • Component : S2002-3749-1
  • Diameter : 6.0 km
  • Max duration : 1.24 sec
Occulted Star
  • Name : UCAC4 555-038725
  • Used RA   :   07h17m46s5 J2000
  • Used DEC : +20d58m15s1 J2000
  • Mb : 10.80
  • Mv : 10.80
  • Mr : 10.33
  • VizieR - Aladin
Historic
  • 2021-11-29 : Create prediction
Prediction for (3749) Balam system. (wide views)

Balam

Balam

S2002-3749-1

S2002-3749-1

Ephemerides from IMCCE

Ephemeris for Balam

Ephemeris for S2002-3749-1

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

Orbitography for the (3749) Balam system

S2002-3749-1

S2002-3749-1

Astrometric observations of S2002-3749-1 centered on (3749) Balam.
Dot represents one observed position. The vector shows ephemeris position from observed position.

All components on the tangent plane

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

S2002-3749-1

S2002-3749-1
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 = 473 km
  • 2-σ error = 483 km
  • 3-σ error = 553 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 -44 sec -45 sec -48 sec
Maximum time offset 9 sec 13 sec 20 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-East

1-σ 2-σ 3-σ
Minimum orthogonal projection -31 km -31 km -65 km
Maximum orthogonal projection 441 km 451 km 488 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 JPL Horizons