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Updated: 2007 MAR 30, 23:24 UT
Event Rank : 77
(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 Apr 29 UT, the 54 km diameter asteroid (965) Angelica will occult a 11.1 mag star in the constellation Leo Minor for observers along a somewhat uncertain path across New Zealand.
In the case of an occultation, the combined light of the asteroid and the star will drop by 3.7 mag to 14.8 mag (the magnitude of the asteroid) for at most 2.7 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
173 49 15 -44 0 0 7 19 27 9 3 -20 173 23 54 174 14 30 172 47 13 174 50 43
173 43 44 -43 0 0 7 19 26 10 3 -20 173 18 47 174 8 36 172 42 41 174 44 14
173 37 21 -42 0 0 7 19 24 11 3 -20 173 12 46 174 1 50 172 37 13 174 36 57
173 30 7 -41 0 0 7 19 23 12 3 -20 173 5 54 173 54 15 172 30 51 174 28 52
173 22 5 -40 0 0 7 19 22 13 3 -20 172 58 11 173 45 53 172 23 38 174 20 2
173 13 16 -39 0 0 7 19 20 14 3 -20 172 49 41 173 36 46 172 15 34 174 10 27
173 3 41 -38 0 0 7 19 18 15 4 -19 172 40 24 173 26 54 172 6 43 174 0 10
172 53 23 -37 0 0 7 19 17 16 4 -19 172 30 22 173 16 19 171 57 5 173 49 12
172 42 22 -36 0 0 7 19 15 17 4 -19 172 19 36 173 5 2 171 46 41 173 37 34
172 30 39 -35 0 0 7 19 13 18 4 -19 172 8 8 172 53 5 171 35 34 173 25 15
172 18 15 -34 0 0 7 19 10 18 4 -18 171 55 57 172 40 28 171 23 43 173 12 19
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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