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Updated: 2011 AUG 23, 00:19 UT
Event Rank : 70
(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 2011 Sep 07 UT, the 47 km diameter asteroid (1127) Mimi will occult a 12.7 mag star in the constellation Cetus for observers along a narrow path across eastern Australia from Rockhampton across south-eastern Queensland and eastern New South Wales to Eden, passing over Goondiwindi and Queanbeyan.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.3 mag to 13.6 mag (the magnitude of the asteroid) for at most 5.3 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
151 8 50 -19 11 9 18 30 34 46 265 -22 151 27 14 -19 11 56 150 50 33 -19 10 19 151 57 57 -19 13 10 150 20 22 -19 8 51
150 54 45 -20 15 13 18 30 48 47 266 -22 151 13 14 -20 16 2 150 36 22 -20 14 22 151 44 6 -20 17 18 150 6 3 -20 12 52
150 41 45 -21 19 11 18 31 1 47 267 -22 151 0 19 -21 20 1 150 23 16 -21 18 19 151 31 21 -21 21 19 149 52 47 -21 16 47
150 29 49 -22 23 5 18 31 14 47 268 -22 150 48 30 -22 23 56 150 11 14 -22 22 12 151 19 44 -22 25 16 149 40 34 -22 20 39
150 18 58 -23 26 57 18 31 28 47 269 -22 150 37 47 -23 27 49 150 0 15 -23 26 2 151 9 13 -23 29 10 149 29 23 -23 24 27
150 9 13 -24 30 47 18 31 41 47 271 -22 150 28 10 -24 31 39 149 50 21 -24 29 52 150 59 50 -24 33 2 149 19 15 -24 28 15
150 0 34 -25 34 37 18 31 54 47 272 -22 150 19 41 -25 35 30 149 41 33 -25 33 41 150 51 36 -25 36 54 149 10 11 -25 32 4
149 53 3 -26 38 29 18 32 7 47 273 -22 150 12 19 -26 39 22 149 33 52 -26 37 32 150 44 32 -26 40 47 149 2 13 -26 35 54
149 46 40 -27 42 23 18 32 21 47 274 -22 150 6 8 -27 43 18 149 27 18 -27 41 27 150 38 40 -27 44 42 148 55 21 -27 39 47
149 41 29 -28 46 22 18 32 34 47 275 -22 150 1 9 -28 47 17 149 21 55 -28 45 25 150 34 2 -28 48 42 148 49 38 -28 43 46
149 37 31 -29 50 27 18 32 47 47 276 -22 149 57 25 -29 51 22 149 17 43 -29 49 30 150 30 39 -29 52 48 148 45 5 -29 47 50
149 34 49 -30 54 39 18 33 1 47 278 -22 149 54 57 -30 55 34 149 14 47 -30 53 42 150 28 36 -30 56 59 148 41 45 -30 52 2
149 33 26 -31 59 0 18 33 14 47 279 -21 149 53 49 -31 59 54 149 13 9 -31 58 3 150 27 54 -32 1 20 148 39 41 -31 56 22
149 33 25 -33 3 30 18 33 27 47 280 -21 149 54 6 -33 4 25 149 12 51 -33 2 33 150 28 39 -33 5 49 148 38 56 -33 0 53
149 34 52 -34 8 12 18 33 40 46 281 -21 149 55 50 -34 9 6 149 14 0 -34 7 15 150 30 54 -34 10 29 148 39 35 -34 5 36
149 37 49 -35 13 6 18 33 54 46 282 -21 149 59 7 -35 13 59 149 16 38 -35 12 10 150 34 44 -35 15 22 148 41 41 -35 10 31
149 42 24 -36 18 14 18 34 7 46 283 -21 150 4 3 -36 19 6 149 20 51 -36 17 19 150 40 15 -36 20 27 148 45 21 -36 15 41
149 48 41 -37 23 37 18 34 20 45 284 -20 150 10 43 -37 24 29 149 26 46 -37 22 43 150 47 33 -37 25 48 148 50 39 -37 21 7
149 56 49 -38 29 17 18 34 34 45 285 -20 150 19 15 -38 30 7 149 34 29 -38 28 24 150 56 47 -38 31 24 148 57 42 -38 26 50
150 6 54 -39 35 15 18 34 47 44 286 -20 150 29 47 -39 36 4 149 44 9 -39 34 24 151 8 3 -39 37 18 149 6 38 -39 32 51
150 19 7 -40 41 32 18 35 0 44 286 -19 150 42 29 -40 42 19 149 55 53 -40 40 43 151 21 33 -40 43 30 149 17 36 -40 39 13
150 33 37 -41 48 10 18 35 13 43 287 -19 150 57 30 -41 48 55 150 9 52 -41 47 22 151 37 26 -41 50 2 149 30 45 -41 45 56
150 50 37 -42 55 10 18 35 27 43 288 -19 151 15 3 -42 55 52 150 26 19 -42 54 24 151 55 56 -42 56 54 149 46 17 -42 53 2
151 10 20 -44 2 32 18 35 40 42 289 -18 151 35 23 -44 3 11 150 45 26 -44 1 50 152 17 17 -44 4 9 150 4 24 -44 0 31
151 33 2 -45 10 19 18 35 53 42 289 -18 151 58 45 -45 10 54 151 7 29 -45 9 39 152 41 46 -45 11 46 150 25 23 -45 8 26
151 59 2 -46 18 30 18 36 6 41 290 -17 152 25 28 -46 19 2 151 32 46 -46 17 55 153 9 42 -46 19 46 150 49 30 -46 16 48
Uncertainty in time = +/- 5 secs
Prediction of 2011 Aug 23.0
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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