Ephemeris from Miriade for the date of occultation and geocenter frame. For more specific ephemeris please use the documentation of Miriade.
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 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 | 8 sec | 8 sec | 6 sec |
Maximum time offset | 23 sec | 23 sec | 24 sec |
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 : West
1-σ | 2-σ | 3-σ | |
---|---|---|---|
Minimum orthogonal projection | -37 km | -44 km | -48 km |
Maximum orthogonal projection | 35 km | 43 km | 48 km |