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Updated: 2005 NOV 01, 03:23 UT
Event Rank : 15
(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 2005 Nov 13 UT, the 10 km diameter asteroid (1235) Schorria will occult a 8.9 mag star in the constellation Cassiopeia for observers along a path across north western Queensland and then over Arnhem Land.
In the case of an occultation, the combined light of the asteroid and the star will drop by 5.2 mag to 14.1 mag (the magnitude of the asteroid) for at most 1.0 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Ron Stone, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: Tycho-2.
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
138 18 7 -25 0 0 14 23 48 7 357 -47 138 23 15 138 12 59 139 9 35 137 25 48
138 3 31 -24 0 0 14 23 50 8 357 -48 138 8 38 137 58 24 138 54 50 137 11 21
137 47 29 -23 0 0 14 23 53 9 357 -49 137 52 34 137 42 22 138 38 40 136 55 25
137 30 0 -22 0 0 14 23 56 10 357 -50 137 35 5 137 24 54 138 21 7 136 38 0
137 11 4 -21 0 0 14 23 59 11 357 -51 137 16 10 137 5 59 138 2 10 136 19 6
136 50 41 -20 0 0 14 24 2 12 358 -52 136 55 47 136 45 35 137 41 48 135 58 41
136 28 50 -19 0 0 14 24 6 13 358 -53 136 33 56 136 23 44 137 20 1 135 36 45
136 5 29 -18 0 0 14 24 10 14 358 -54 136 10 35 136 0 22 136 56 46 135 13 17
135 40 36 -17 0 0 14 24 15 15 358 -55 135 45 44 135 35 28 136 32 3 134 48 14
135 14 11 -16 0 0 14 24 20 16 358 -56 135 19 19 135 9 1 136 5 50 134 21 34
134 46 9 -15 0 0 14 24 25 17 359 -57 134 51 19 134 40 58 135 38 4 133 53 16
134 16 29 -14 0 0 14 24 31 18 359 -57 134 21 41 134 11 16 135 8 43 133 23 15
133 45 8 -13 0 0 14 24 37 19 359 -58 133 50 22 133 39 53 134 37 43 132 51 30
133 12 1 -12 0 0 14 24 43 20 359 -59 133 17 18 133 6 43 134 5 3 132 17 55
132 37 5 -11 0 0 14 24 50 21 360 -60 132 42 25 132 31 44 133 30 37 131 42 26
132 0 15 -10 0 0 14 24 58 22 360 -61 132 5 38 131 54 50 132 54 21 131 4 58
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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