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Updated: 2010 MAR 03, 20:50 UT
Event Rank : 25
(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 2010 May 02 UT, the 27 km diameter asteroid (1464) Armisticia will occult a 9.5 mag star in the constellation Sagittarius for observers along a path across the northern tip of New Zealand near Whangarei.
In the case of an occultation, the combined light of the asteroid and the star will drop by 6.7 mag to 16.2 mag (the magnitude of the asteroid) for at most 9.1 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
179 0 33 -34 3 29 11 8 15 25 100 -68 179 17 38 -34 9 27 178 43 20 -33 57 27 -179 13 13 -34 40 17 177 8 58 -33 24 1
177 35 33 -34 38 2 11 8 47 24 101 -67 177 53 11 -34 44 16 177 17 47 -34 31 44 179 25 0 -35 16 23 175 40 11 -33 56 45
176 5 21 -35 11 4 11 9 19 23 101 -66 176 23 36 -35 17 36 175 46 57 -35 4 28 177 58 26 -35 51 10 174 5 36 -34 27 41
174 29 19 -35 42 20 11 9 51 22 102 -65 174 48 16 -35 49 12 174 10 11 -35 35 22 176 26 34 -36 24 27 172 24 26 -34 56 31
172 46 41 -36 11 31 11 10 23 21 102 -63 173 6 29 -36 18 47 172 26 41 -36 4 8 174 48 48 -36 55 58 170 35 40 -35 22 48
170 56 29 -36 38 12 11 10 55 20 103 -62 171 17 17 -36 45 57 170 35 26 -36 30 20 173 4 22 -37 25 26 168 38 0 -35 45 58
168 57 26 -37 1 51 11 11 27 19 104 -61 169 19 27 -37 10 11 168 35 5 -36 53 23 171 12 19 -37 52 25 166 29 31 -36 5 13
166 47 44 -37 21 42 11 12 0 17 105 -59 167 11 20 -37 30 46 166 23 44 -37 12 27 169 11 22 -38 16 23 164 7 26 -36 19 21
Uncertainty in time = +/- 24 secs
Prediction of 2010 Mar 4.0
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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