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Updated: 2007 DEC 06, 02:42 UT
Event Rank : 61
(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 Dec 16 UT, the 47 km diameter asteroid (1127) Mimi will occult a 11.7 mag star in the constellation Eridanus for observers along a narrow path across Western Australia, from near Hopetoun to Learmonth.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.7 mag (the magnitude of the asteroid) for at most 6.1 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 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
112 44 20 -18 0 0 15 52 9 57 282 -48 113 0 26 112 28 17 113 32 46 111 56 20
113 5 12 -19 0 0 15 51 54 56 284 -47 113 21 26 112 49 0 113 54 4 112 16 46
113 26 59 -20 0 0 15 51 40 56 285 -46 113 43 23 113 10 38 114 16 20 112 38 5
113 49 44 -21 0 0 15 51 26 55 286 -45 114 6 18 113 33 13 114 39 36 113 0 21
114 13 30 -22 0 0 15 51 12 55 287 -44 114 30 15 113 56 48 115 3 55 113 23 35
114 38 19 -23 0 0 15 50 58 54 288 -43 114 55 15 114 21 26 115 29 19 113 47 50
115 4 14 -24 0 0 15 50 44 53 289 -42 115 21 23 114 47 8 115 55 51 114 13 8
115 31 18 -25 0 0 15 50 29 53 290 -41 115 48 40 115 14 0 116 23 36 114 39 34
115 59 35 -26 0 0 15 50 16 52 291 -41 116 17 11 115 42 3 116 52 36 115 7 9
116 29 9 -27 0 0 15 50 2 51 292 -40 116 47 0 116 11 21 117 22 55 115 35 59
117 0 3 -28 0 0 15 49 48 50 293 -39 117 18 10 116 41 59 117 54 38 116 6 5
Latitude Latitude Latitude Latitude
118 0 0 -29 49 12 15 49 23 49 294 -37 -29 16 28 -30 21 35 -28 9 52 -31 25 21
119 0 0 -31 30 2 15 49 0 48 295 -35 -30 58 53 -32 0 54 -29 55 35 -33 1 45
120 0 0 -33 3 27 15 48 39 46 295 -34 -32 33 40 -33 32 58 -31 33 15 -34 31 15
121 0 0 -34 30 16 15 48 19 45 296 -32 -34 1 42 -34 58 36 -33 3 50 -35 54 36
122 0 0 -35 51 13 15 48 1 44 296 -31 -35 23 44 -36 18 29 -34 28 6 -37 12 26
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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