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Updated: 2007 AUG 15, 01:09 UT
Event Rank : 31
(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 2007 Sep 14 UT, the 44 km diameter asteroid (1456) Saldanha will occult a 11.9 mag star in the constellation Auriga for observers along a path across Australia from west of Ceduna in South Australia across southern Queensland to Rockhampton.
In the case of an occultation, the combined light of the asteroid and the star will drop by 4.5 mag to 16.4 mag (the magnitude of the asteroid) for at most 3.0 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, 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 Limits Error Limits
E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' "
Longitude Longitude Longitude Longitude
131 34 4 -33 0 0 18 57 36 20 27 -29 132 12 17 130 56 17 135 4 38 128 16 13
133 13 36 -32 0 0 18 57 44 22 26 -28 133 52 37 132 35 5 136 49 1 129 52 16
134 56 50 -31 0 0 18 57 52 23 25 -27 135 36 48 134 17 25 138 38 9 131 31 17
136 44 20 -30 0 0 18 58 2 25 23 -25 137 25 26 136 3 50 140 32 49 133 13 41
138 36 47 -29 0 0 18 58 12 27 22 -24 139 19 18 137 54 58 142 34 7 134 59 56
140 35 5 -28 0 0 18 58 23 28 20 -22 141 19 20 139 51 39 144 43 27 136 50 42
142 40 23 -27 0 0 18 58 36 30 18 -21 143 26 48 141 54 57 147 2 47 138 46 43
Latitude Latitude Latitude Latitude
143 0 0 -26 50 57 18 58 38 30 18 -20 -27 12 18 -26 29 46 -28 47 40 -24 59 27
144 0 0 -26 23 48 18 58 45 31 17 -20 -26 45 1 -26 2 46 -28 19 42 -24 33 2
145 0 0 -25 57 31 18 58 51 31 16 -19 -26 18 36 -25 36 38 -27 52 37 -24 7 27
146 0 0 -25 32 6 18 58 58 32 15 -18 -25 53 2 -25 11 21 -27 26 26 -23 42 42
147 0 0 -25 7 33 18 59 4 33 14 -17 -25 28 22 -24 46 55 -27 1 9 -23 18 48
148 0 0 -24 43 53 18 59 11 33 13 -16 -25 4 33 -24 23 22 -26 36 46 -22 55 44
149 0 0 -24 21 4 18 59 18 34 12 -15 -24 41 38 -24 0 41 -26 13 17 -22 33 32
150 0 0 -23 59 9 18 59 25 34 11 -14 -24 19 35 -23 38 51 -25 50 43 -22 12 10
151 0 0 -23 38 6 18 59 32 35 10 -13 -23 58 26 -23 17 55 -25 29 3 -21 51 40
152 0 0 -23 17 55 18 59 39 35 9 -12 -23 38 9 -22 57 51 -25 8 17 -21 32 1
153 0 0 -22 58 38 18 59 46 36 8 -11 -23 18 46 -22 38 39 -24 48 26 -21 13 14
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
[Timing Details]
[Reporting Details]
[Report Form]
[Asteroid Occultation Results]
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