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Updated: 2008 OCT 30, 14:43 UT
Event Rank : 6
(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 2008 Nov 13 UT, the 11 km diameter asteroid (3322) Lidiya will occult a 10.3 mag star in the constellation Pegasus for observers along a narrow path of significant uncertainty across Australia from Weipa across western Queensland and eastern South Australia to Meningie.
In the case of an occultation, the combined light of the asteroid and the star will drop by 5.7 mag to 16.0 mag (the magnitude of the asteroid) for at most 0.9 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 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
142 17 8 - 3 28 51 10 26 56 57 13 -30 142 20 8 - 3 28 38 142 14 8 - 3 29 3 143 21 48 - 3 24 41 141 12 16 - 3 33 42
142 12 14 - 5 10 39 10 27 9 56 13 -29 142 15 15 - 5 10 26 142 9 14 - 5 10 51 143 17 5 - 5 6 23 141 7 12 - 5 15 36
142 6 53 - 6 54 29 10 27 22 54 12 -28 142 9 54 - 6 54 16 142 3 51 - 6 54 42 143 11 57 - 6 50 7 141 1 36 - 6 59 34
142 1 0 - 8 40 35 10 27 34 52 12 -28 142 4 2 - 8 40 21 141 57 58 - 8 40 48 143 6 22 - 8 36 5 140 55 25 - 8 45 49
141 54 34 -10 29 12 10 27 47 51 11 -27 141 57 37 -10 28 58 141 51 31 -10 29 26 143 0 19 -10 24 34 140 48 35 -10 34 37
141 47 31 -12 20 40 10 28 0 49 11 -26 141 50 35 -12 20 25 141 44 26 -12 20 54 142 53 43 -12 15 51 140 41 3 -12 26 16
141 39 45 -14 15 19 10 28 12 47 11 -25 141 42 51 -14 15 4 141 36 39 -14 15 34 142 46 32 -14 10 18 140 32 43 -14 21 9
141 31 12 -16 13 35 10 28 25 45 11 -24 141 34 20 -16 13 20 141 28 4 -16 13 51 142 38 38 -16 8 21 140 23 28 -16 19 42
141 21 44 -18 16 1 10 28 38 43 10 -23 141 24 54 -18 15 44 141 18 33 -18 16 17 142 29 58 -18 10 30 140 13 9 -18 22 26
141 11 10 -20 23 14 10 28 50 41 10 -22 141 14 23 -20 22 56 141 7 57 -20 23 31 142 20 21 -20 17 24 140 1 37 -20 30 2
140 59 19 -22 36 3 10 29 3 39 10 -20 141 2 35 -22 35 45 140 56 3 -22 36 22 142 9 39 -22 29 50 139 48 35 -22 43 19
140 45 53 -24 55 33 10 29 16 36 10 -19 140 49 13 -24 55 13 140 42 33 -24 55 53 141 57 34 -24 48 51 139 33 44 -25 3 21
140 30 29 -27 23 5 10 29 28 34 10 -18 140 33 53 -27 22 43 140 27 4 -27 23 27 141 43 49 -27 15 48 139 16 37 -27 31 35
140 12 31 -30 0 36 10 29 41 31 10 -16 140 16 1 -30 0 12 140 9 0 -30 1 0 141 27 53 -29 52 33 138 56 31 -30 10 1
139 51 6 -32 50 54 10 29 54 28 10 -14 139 54 43 -32 50 27 139 47 28 -32 51 21 141 9 0 -32 41 48 138 32 25 -33 1 32
139 24 46 -35 58 18 10 30 7 25 10 -12 139 28 33 -35 57 47 139 20 59 -35 58 50 140 45 59 -35 47 45 138 2 34 -36 10 42
Uncertainty in time = +/- 9 secs
[Prediction of 2008 Oct 30.0]
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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