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Updated: 2005 SEP 01, 03:16 UT
Event Rank : 40
(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 Sep 03 UT, the 18 km diameter asteroid (1088) Mitaka will occult a 8.5 mag star in the constellation Sagittarius for observers along a path running up the length of New Zealand, passing near Dunedin and Westport.
In the case of an occultation, the combined light of the asteroid and the star will drop by 5.6 mag to 14.1 mag (the magnitude of the asteroid) for at most 7.4 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Ron Stone, 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
174 15 42 -30 0 0 8 15 2 77 116 -28 174 21 26 174 9 58 174 40 8 173 51 15
174 9 4 -31 0 0 8 14 15 77 112 -28 174 14 53 174 3 16 174 33 47 173 44 19
174 1 47 -32 0 0 8 13 27 78 107 -27 174 7 39 173 55 54 174 26 47 173 36 43
173 53 46 -33 0 0 8 12 40 78 103 -27 173 59 43 173 47 49 174 19 6 173 28 24
173 45 1 -34 0 0 8 11 52 77 98 -26 173 51 2 173 38 59 174 10 41 173 19 18
173 35 27 -35 0 0 8 11 5 77 94 -26 173 41 34 173 29 20 174 1 28 173 9 23
173 25 3 -36 0 0 8 10 17 77 89 -25 173 31 15 173 18 51 173 51 27 172 58 36
173 13 44 -37 0 0 8 9 29 77 85 -25 173 20 2 173 7 26 173 40 32 172 46 53
173 1 28 -38 0 0 8 8 41 76 82 -24 173 7 51 172 55 4 173 28 41 172 34 11
172 48 9 -39 0 0 8 7 53 76 78 -24 172 54 39 172 41 39 173 15 49 172 20 25
172 33 45 -40 0 0 8 7 6 75 75 -23 172 40 22 172 27 8 173 1 53 172 5 32
172 18 11 -41 0 0 8 6 18 74 72 -23 172 24 54 172 11 27 172 46 49 171 49 27
172 1 21 -42 0 0 8 5 30 74 69 -22 172 8 12 171 54 29 172 30 31 171 32 5
171 43 10 -43 0 0 8 4 42 73 67 -22 171 50 9 171 36 10 172 12 54 171 13 20
171 23 32 -44 0 0 8 3 54 72 65 -21 171 30 40 171 16 24 171 53 53 170 53 5
171 2 21 -45 0 0 8 3 6 71 63 -21 171 9 38 170 55 3 171 33 20 170 31 15
170 39 29 -46 0 0 8 2 18 71 61 -20 170 46 56 170 32 2 171 11 10 170 7 41
170 14 48 -47 0 0 8 1 30 70 60 -20 170 22 26 170 7 11 170 47 13 169 42 16
169 48 10 -48 0 0 8 0 42 69 59 -19 169 55 58 169 40 21 170 21 22 169 14 50
169 19 24 -49 0 0 7 59 54 68 58 -18 169 27 24 169 11 23 169 53 27 168 45 12
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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