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Updated: 2007 OCT 10, 04:13 UT
Event Rank : 79
(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 Oct 24 UT, the 47 km diameter asteroid (1127) Mimi will occult a 9.6 mag star in the constellation Eridanus for observers along a path over eastern New South Wales, eastern Victoria and north-western Tasmania. The predicted path is centred directly over Sydney, passes very near Canberra and runs from Sale to Wilson's Prom in Victoria.
In the case of an occultation, the combined light of the asteroid and the star will drop by 3.6 mag to 13.2 mag (the magnitude of the asteroid) for at most 8.5 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
155 26 36 -29 45 28 18 8 13 41 281 -10 155 46 15 -29 53 14 155 7 7 -29 37 40 156 13 41 -30 3 54 154 40 33 -29 26 52
154 32 30 -30 35 53 18 8 34 41 282 -10 154 52 8 -30 43 45 154 13 3 -30 27 59 155 19 32 -30 54 34 153 46 29 -30 17 3
153 39 9 -31 26 18 18 8 54 42 283 -10 153 58 47 -31 34 16 153 19 43 -31 18 18 154 26 11 -31 45 13 152 53 10 -31 7 14
152 46 31 -32 16 43 18 9 15 42 284 -11 153 6 10 -32 24 47 152 27 4 -32 8 37 153 33 34 -32 35 53 152 0 30 -31 57 25
151 54 31 -33 7 10 18 9 35 43 286 -11 152 14 11 -33 15 20 151 35 2 -32 58 59 152 41 38 -33 26 35 151 8 27 -32 47 38
151 3 6 -33 57 41 18 9 56 43 287 -11 151 22 48 -34 5 57 150 43 35 -33 49 23 151 50 18 -34 17 20 150 16 56 -33 37 55
150 12 12 -34 48 16 18 10 16 43 288 -12 150 31 58 -34 56 39 149 52 38 -34 39 52 150 59 32 -35 8 10 149 25 55 -34 28 15
149 21 47 -35 38 57 18 10 37 44 290 -12 149 41 36 -35 47 26 149 2 9 -35 30 27 150 9 16 -35 59 6 148 35 20 -35 18 42
148 31 47 -36 29 46 18 10 57 44 291 -12 148 51 41 -36 38 21 148 12 4 -36 21 10 149 19 28 -36 50 10 147 45 9 -36 9 15
147 42 9 -37 20 43 18 11 18 44 293 -12 148 2 9 -37 29 25 147 22 20 -37 12 0 148 30 4 -37 41 23 146 55 19 -36 59 57
146 52 51 -38 11 50 18 11 38 44 294 -12 147 12 57 -38 20 38 146 32 56 -38 3 0 147 41 1 -38 32 45 146 5 46 -37 50 48
146 3 50 -39 3 7 18 11 58 45 296 -13 146 24 3 -39 12 3 145 43 48 -38 54 11 146 52 17 -39 24 20 145 16 28 -38 41 49
145 15 3 -39 54 38 18 12 19 45 297 -13 145 35 24 -40 3 40 144 54 53 -39 45 34 146 3 50 -40 16 7 144 27 23 -39 33 3
144 26 27 -40 46 21 18 12 39 45 299 -13 144 46 58 -40 55 31 144 6 9 -40 37 11 145 15 36 -41 8 8 143 38 28 -40 24 30
143 38 1 -41 38 21 18 13 0 45 300 -13 143 58 42 -41 47 37 143 17 34 -41 29 3 144 27 34 -42 0 25 142 49 39 -41 16 12
142 49 41 -42 30 36 18 13 20 45 302 -13 143 10 32 -42 40 1 142 29 3 -42 21 11 143 39 40 -42 52 59 142 0 55 -42 8 9
142 1 25 -43 23 10 18 13 41 45 303 -13 142 22 28 -43 32 42 141 40 36 -43 13 36 142 51 52 -43 45 51 141 12 13 -43 0 24
141 13 11 -44 16 3 18 14 1 45 305 -13 141 34 25 -44 25 43 140 52 9 -44 6 21 142 4 8 -44 39 4 140 23 30 -43 52 58
140 24 54 -45 9 17 18 14 22 45 306 -13 140 46 22 -45 19 6 140 3 39 -44 59 27 141 16 24 -45 32 38 139 34 43 -44 45 51
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