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Updated: 2013 JUL 05, 16:45 UT
Event Rank : 30
(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 2013 Aug 30 UT, the 37 km diameter asteroid (1760) Sandra will occult a 9.8 mag star in the constellation Aquarius for observers along a path across south west Western Australia between Perth and Albany (low altitude event).
In the case of an occultation, the combined light of the asteroid and the star will drop by 6.6 mag to 16.4 mag (the magnitude of the asteroid) for at most 2.9 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, 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
130 41 58 -30 48 10 19 45 59 5 270 -24 133 5 53 -30 51 16 129 2 47 -30 42 46 ... .. .. .. .. .. 124 9 15 -30 11 2
126 20 35 -31 26 12 19 46 6 9 272 -28 127 30 21 -31 33 10 125 18 16 -31 18 51 ... .. .. .. .. .. 121 33 1 -30 43 21
123 20 52 -32 0 5 19 46 14 11 273 -30 124 14 13 -32 7 58 122 31 8 -31 52 2 129 34 15 -32 39 19 119 19 30 -31 14 33
120 54 15 -32 32 21 19 46 21 13 275 -32 121 39 27 -32 40 43 120 11 21 -32 23 53 125 42 52 -33 16 17 117 20 40 -31 45 5
118 46 52 -33 3 42 19 46 28 15 276 -34 119 27 1 -33 12 23 118 8 23 -32 54 57 122 53 38 -33 50 7 115 32 18 -32 15 8
116 52 26 -33 34 28 19 46 35 16 277 -35 117 29 4 -33 43 24 116 17 5 -33 25 30 120 32 56 -34 22 35 113 51 54 -32 44 52
115 7 26 -34 4 50 19 46 42 18 279 -36 115 41 28 -34 13 57 114 34 27 -33 55 41 118 29 33 -34 54 15 112 17 45 -33 14 22
113 29 41 -34 34 56 19 46 49 19 280 -37 114 1 42 -34 44 13 112 58 34 -34 25 37 116 38 4 -35 25 23 110 48 42 -33 43 41
111 57 44 -35 4 49 19 46 57 20 281 -38 112 28 8 -35 14 15 111 28 7 -34 55 22 114 55 24 -35 56 11 109 23 53 -34 12 52
110 30 33 -35 34 34 19 47 4 21 282 -39 110 59 37 -35 44 8 110 2 10 -35 25 0 113 19 33 -36 26 44 108 2 39 -34 41 58
109 7 19 -36 4 13 19 47 11 22 283 -40 109 35 16 -36 13 54 108 39 59 -35 54 31 111 49 13 -36 57 7 106 44 29 -35 11 1
107 47 27 -36 33 48 19 47 18 23 284 -41 108 14 28 -36 43 36 107 21 1 -36 24 0 110 23 23 -37 27 23 105 28 59 -35 40 1
106 30 30 -37 3 21 19 47 25 24 285 -42 106 56 42 -37 13 15 106 4 50 -36 53 26 109 1 22 -37 57 35 104 15 49 -36 9 1
105 16 5 -37 32 53 19 47 32 25 286 -42 105 41 35 -37 42 54 104 51 5 -37 22 52 107 42 34 -38 27 44 103 4 42 -36 38 1
104 3 52 -38 2 26 19 47 40 25 287 -43 104 28 45 -38 12 33 103 39 28 -37 52 19 106 26 33 -38 57 52 101 55 25 -37 7 2
102 53 37 -38 32 0 19 47 47 26 288 -44 103 17 57 -38 42 13 102 29 43 -38 21 47 105 12 59 -39 28 2 100 47 45 -37 36 5
101 45 5 -39 1 36 19 47 54 27 289 -44 102 8 57 -39 11 56 101 21 39 -38 51 18 104 1 32 -39 58 13 99 41 32 -38 5 11
100 38 7 -39 31 16 19 48 1 27 290 -45 101 1 33 -39 41 42 100 15 6 -39 20 52 102 51 59 -40 28 27 98 36 37 -38 34 20
99 32 31 -40 1 0 19 48 8 28 291 -45 99 55 34 -40 11 31 99 9 52 -39 50 30 101 44 5 -40 58 44 97 32 53 -39 3 33
98 28 10 -40 30 49 19 48 15 28 293 -45 98 50 53 -40 41 26 98 5 51 -40 20 13 100 37 42 -41 29 7 96 30 12 -39 32 51
Uncertainty in time = +/- 7 secs
Prediction of 2013 Apr 8.0
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