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Updated: 2006 APR 17, 22:35 UT
Event Rank : 51
(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 May 15 UT, the 55 km diameter asteroid (1330) Spiridonia will occult a 11.0 mag star in the constellation Aquila for observers along a path across South Australia, passing near Ceduna, and Northern Territory, passing near Alice Springs and Darwin.
In the case of an occultation, the combined light of the asteroid and the star will drop by 4.6 mag to 15.6 mag (the magnitude of the asteroid) for at most 13.0 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
134 46 16 -37 9 45 17 13 39 50 40 -55 134 25 9 -37 13 43 135 7 18 -37 5 47 133 31 54 -37 23 35 135 59 28 -36 55 50
134 40 38 -35 41 7 17 14 12 51 41 -56 134 19 59 -35 45 1 135 1 11 -35 37 13 133 27 57 -35 54 45 135 52 12 -35 27 25
134 33 27 -34 13 51 17 14 46 52 42 -56 134 13 14 -34 17 41 134 53 35 -34 10 0 133 22 18 -34 27 17 135 43 34 -34 0 20
134 24 53 -32 47 48 17 15 20 53 44 -56 134 5 4 -32 51 36 134 44 38 -32 44 0 133 15 8 -33 1 3 135 33 40 -32 34 29
134 15 4 -31 22 54 17 15 54 54 45 -57 133 55 35 -31 26 39 134 34 27 -31 19 9 133 6 34 -31 35 59 135 22 38 -31 9 44
134 4 4 -29 59 2 17 16 27 55 46 -57 133 44 55 -30 2 44 134 23 8 -29 55 20 132 56 43 -30 11 58 135 10 31 -29 46 2
133 51 59 -28 36 7 17 17 1 56 48 -57 133 33 8 -28 39 47 134 10 46 -28 32 27 132 45 41 -28 48 54 134 57 26 -28 23 16
133 38 53 -27 14 5 17 17 35 57 50 -58 133 20 18 -27 17 42 133 57 24 -27 10 27 132 33 33 -27 26 44 134 43 24 -27 1 22
133 24 51 -25 52 51 17 18 8 58 51 -58 133 6 31 -25 56 26 133 43 7 -25 49 16 132 20 23 -26 5 23 134 28 31 -25 40 15
133 9 54 -24 32 21 17 18 42 59 53 -58 132 51 47 -24 35 54 133 27 56 -24 28 48 132 6 15 -24 44 46 134 12 47 -24 19 52
132 54 5 -23 12 32 17 19 16 59 55 -58 132 36 11 -23 16 3 133 11 55 -23 9 0 131 51 11 -23 24 50 133 56 16 -23 0 9
132 37 27 -21 53 19 17 19 49 60 57 -58 132 19 44 -21 56 49 132 55 6 -21 49 49 131 35 13 -22 5 31 133 38 59 -21 41 3
132 20 1 -20 34 40 17 20 23 60 59 -59 132 2 28 -20 38 8 132 37 29 -20 31 11 131 18 23 -20 46 46 133 20 57 -20 22 29
132 1 48 -19 16 31 17 20 57 61 62 -59 131 44 25 -19 19 58 132 19 7 -19 13 4 131 0 44 -19 28 33 133 2 11 -19 4 26
131 42 49 -17 58 50 17 21 30 61 64 -59 131 25 35 -18 2 15 132 0 0 -17 55 24 130 42 15 -18 10 47 132 42 43 -17 46 49
131 23 5 -16 41 33 17 22 4 62 66 -59 131 5 58 -16 44 57 131 40 8 -16 38 9 130 22 59 -16 53 25 132 22 32 -16 29 37
131 2 36 -15 24 38 17 22 38 62 69 -59 130 45 37 -15 28 1 131 19 32 -15 21 15 130 2 55 -15 36 27 132 1 40 -15 12 46
130 41 23 -14 8 3 17 23 11 62 71 -59 130 24 30 -14 11 25 130 58 13 -14 4 41 129 42 4 -14 19 48 131 40 5 -13 56 14
130 19 25 -12 51 45 17 23 45 63 74 -58 130 2 38 -12 55 5 130 36 10 -12 48 23 129 20 26 -13 3 26 131 17 49 -12 39 59
129 56 43 -11 35 40 17 24 19 63 76 -58 129 40 0 -11 39 0 130 13 23 -11 32 20 128 58 1 -11 47 18 130 54 50 -11 23 58
129 33 15 -10 19 48 17 24 53 63 79 -58 129 16 37 -10 23 7 129 49 51 -10 16 29 128 34 48 -10 31 24 130 31 7 -10 8 9
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