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Updated: 2007 OCT 15, 14:16 UT
Event Rank : 26
(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 Nov 16 UT, the 39 km diameter asteroid (1116) Catriona will occult a 11.5 mag star in the constellation Lynx for observers along a path across central Australia from the Nullabor to Kununurra and Darwin.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.0 mag to 13.4 mag (the magnitude of the asteroid) for at most 5.9 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: .
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
130 50 57 -36 0 0 19 23 48 6 353 -7 131 4 26 130 37 28 132 14 15 129 28 12
130 43 24 -35 0 0 19 23 49 7 353 -8 130 56 42 130 30 6 132 5 36 129 21 44
130 36 21 -34 0 0 19 23 52 8 353 -9 130 49 30 130 23 14 131 57 32 129 15 42
130 29 47 -33 0 0 19 23 54 9 353 -9 130 42 46 130 16 49 131 49 58 129 10 6
130 23 40 -32 0 0 19 23 57 10 353 -10 130 36 30 130 10 51 131 42 55 129 4 54
130 17 59 -31 0 0 19 24 0 11 353 -10 130 30 40 130 5 18 131 36 21 129 0 5
130 12 42 -30 0 0 19 24 3 12 353 -11 130 25 15 130 0 10 131 30 14 128 55 38
130 7 49 -29 0 0 19 24 7 13 353 -11 130 20 15 129 55 24 131 24 33 128 51 32
130 3 19 -28 0 0 19 24 11 14 353 -12 130 15 37 129 51 1 131 19 17 128 47 46
129 59 10 -27 0 0 19 24 15 15 353 -12 130 11 21 129 46 59 131 14 26 128 44 20
129 55 22 -26 0 0 19 24 20 16 353 -13 130 7 27 129 43 18 131 9 58 128 41 12
129 51 55 -25 0 0 19 24 25 17 353 -13 130 3 53 129 39 57 131 5 52 128 38 22
129 48 47 -24 0 0 19 24 30 18 353 -14 130 0 40 129 36 55 131 2 8 128 35 50
129 45 58 -23 0 0 19 24 35 19 353 -14 129 57 45 129 34 11 130 58 44 128 33 35
129 43 27 -22 0 0 19 24 41 20 353 -15 129 55 9 129 31 46 130 55 41 128 31 36
129 41 14 -21 0 0 19 24 47 21 353 -15 129 52 51 129 29 37 130 52 58 128 29 52
129 39 18 -20 0 0 19 24 53 22 353 -16 129 50 51 129 27 46 130 50 34 128 28 25
129 37 40 -19 0 0 19 25 0 23 353 -16 129 49 8 129 26 12 130 48 29 128 27 13
129 36 18 -18 0 0 19 25 6 24 353 -17 129 47 42 129 24 54 130 46 42 128 26 15
129 35 12 -17 0 0 19 25 13 25 352 -17 129 46 33 129 23 52 130 45 13 128 25 33
129 34 22 -16 0 0 19 25 21 26 352 -18 129 45 39 129 23 6 130 44 2 128 25 4
129 33 48 -15 0 0 19 25 29 27 352 -18 129 45 2 129 22 35 130 43 8 128 24 50
129 33 30 -14 0 0 19 25 36 28 352 -18 129 44 41 129 22 20 130 42 31 128 24 50
129 33 27 -13 0 0 19 25 45 29 352 -19 129 44 35 129 22 20 130 42 11 128 25 4
129 33 39 -12 0 0 19 25 53 30 352 -19 129 44 45 129 22 35 130 42 8 128 25 32
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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