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Updated: 2006 APR 19, 22:20 UT
Event Rank : 75
(The event Rank is a measure of the likelihood of observing an event, and is equal to the probability of at least one successful observation by a team of two observers spaced 1/8 path width just inside opposite sides of the predicted path. An event rank of 100 indicates that the prediction is expected to be very accurate).
THE UPDATED PATH
Note: The duration given in the line below is the interval during which the occultation shadow sweeps across the Earth - please see the minute markers on the map to determine the approximate time for your location.
On 2006 Apr 23 UT, the 69 km diameter asteroid (1115) Sabauda will occult a 11.9 mag star in the constellation Leo Minor for observers along a path across central Australia.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 14.0 mag (the magnitude of the asteroid) for at most 8.3 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Ron Stone, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC.
Additional details of this and other events are available at Steve Preston's website at http://www.asteroidoccultation.com/
EVENT DETAILS SUMMARY :Important Note regarding Accuracy:
The uncertainty interval in path widths given above (and shown as a 1-sigma uncertainty ellipse on the plot) refers to RMS deviation and is applied as a +/- range. In other words, a path uncertainty of 1.0 path widths means that the actual center of the asteroid's shadow path should fall within plus or minus 1 path width of the plotted path center. However path errors larger than 1 sigma have been observed so observers should be alert for primary occultations within plus or minus 3 sigma of the updated path.
Further, almost all asteroidal satellites discovered so far have been found within 10 diameters of the asteroid (since this distance is deep enough within the gravitational well to be stable over long timescales). Therefore, if monitoring for secondary events, observing out to about 10 path-widths either side of the predicted track remains worthwhile.
We therefore recommend that you monitor for events if your observing location is up to +/- 10 path-widths from the predicted track. If not monitoring for occultations by secondary bodies you should observe from locations within 3 sigma of the nominal path.
In terms of time, the predictions are now usually accurate to about +/- 0.3 minute so you should be most attentive during the predicted minute of the event. However if intending to catch a potential satellite occultation you should start observing at least 10 times the predicted central duration before the predicted closest approach time for your location, and continue for a similar period afterwards.
Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2
E. Longitude Latitude U.T. Alt Az Alt
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' "
Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude
126 30 9 - 9 41 45 15 35 1 29 311 -87 127 1 40 - 9 54 48 125 59 8 - 9 29 2 127 49 54 -10 15 2 125 13 28 - 9 10 34
126 48 28 -11 6 4 15 35 14 28 311 -88 127 20 54 -11 19 43 126 16 36 -10 52 47 128 10 38 -11 40 56 125 29 44 -10 33 31
127 10 19 -12 33 12 15 35 28 27 311 -88 127 43 50 -12 47 34 126 37 26 -12 19 15 128 35 21 -13 9 56 125 49 10 -11 59 3
127 36 18 -14 3 34 15 35 41 25 312 -87 128 11 7 -14 18 47 127 2 10 -13 48 49 129 4 49 -14 42 34 126 12 13 -13 27 30
128 7 9 -15 37 44 15 35 54 24 312 -86 128 43 36 -15 54 0 127 31 32 -15 22 0 129 40 1 -16 19 32 126 39 32 -14 59 22
128 43 57 -17 16 26 15 36 8 22 312 -84 129 22 27 -17 34 1 128 6 28 -16 59 30 130 22 19 -18 1 45 127 11 56 -16 35 13
129 28 12 -19 0 43 15 36 21 21 312 -83 130 9 22 -19 20 0 128 48 18 -18 42 15 131 13 49 -19 50 38 127 50 33 -18 15 53
130 22 9 -20 52 6 15 36 34 19 312 -80 131 6 56 -21 13 41 129 39 1 -20 31 34 132 17 46 -21 48 19 128 37 2 -20 2 31
131 29 25 -22 52 57 15 36 48 17 312 -78 132 19 30 -23 17 51 130 41 41 -22 29 32 133 40 2 -23 58 31 129 33 51 -21 56 45
132 56 36 -25 7 31 15 37 1 14 311 -76 133 55 19 -25 37 46 132 1 43 -24 39 38 135 32 52 -26 28 54 130 45 7 -24 1 21
134 58 14 -27 44 54 15 37 15 11 311 -72 136 14 32 -28 25 55 133 50 4 -27 8 49 138 34 6 -29 42 35 132 18 29 -26 21 12
138 24 49 -31 16 2 15 37 28 6 309 -68 141 0 43 -32 45 1 136 37 47 -30 16 18 ... .. .. .. .. .. 134 31 55 -29 7 39
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
[Timing Details]
[Reporting Details]
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[Asteroid Occultation Results]
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