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Updated: 2005 JUL 24, 01:42 UT
Event Rank : 54
(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 Aug 16 UT, the 38 km diameter asteroid (1211) Bressole will occult a 10.9 mag star in the constellation Sagittarius for observers along a path across central Australia.
In the case of an occultation, the combined light of the asteroid and the star will drop by 4.0 mag to 14.9 mag (the magnitude of the asteroid) for at most 6.5 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 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
138 42 7 - 9 37 14 13 26 52 59 252 -69 138 54 0 - 9 37 31 138 30 15 - 9 36 56 139 21 39 - 9 38 6 138 2 50 - 9 36 12
138 26 1 -10 54 47 13 27 16 60 254 -69 138 37 56 -10 55 4 138 14 8 -10 54 29 139 5 40 -10 55 41 137 46 38 -10 53 43
138 10 51 -12 12 2 13 27 40 60 256 -69 138 22 49 -12 12 20 137 58 56 -12 11 43 138 50 38 -12 12 58 137 31 20 -12 10 57
137 56 36 -13 29 2 13 28 4 60 258 -69 138 8 36 -13 29 20 137 44 37 -13 28 43 138 36 33 -13 30 0 137 16 55 -13 27 54
137 43 15 -14 45 49 13 28 28 61 260 -69 137 55 19 -14 46 8 137 31 13 -14 45 29 138 23 23 -14 46 48 137 3 23 -14 44 40
137 30 48 -16 2 25 13 28 52 61 262 -69 137 42 56 -16 2 44 137 18 42 -16 2 5 138 11 9 -16 3 26 136 50 42 -16 1 15
137 19 14 -17 18 53 13 29 16 61 265 -69 137 31 27 -17 19 13 137 7 4 -17 18 33 137 59 50 -17 19 55 136 38 54 -17 17 42
137 8 35 -18 35 16 13 29 40 61 267 -69 137 20 52 -18 35 36 136 56 19 -18 34 55 137 49 27 -18 36 19 136 27 58 -18 34 3
136 58 50 -19 51 35 13 30 4 62 269 -68 137 11 12 -19 51 55 136 46 28 -19 51 14 137 40 0 -19 52 39 136 17 54 -19 50 22
136 49 59 -21 7 53 13 30 28 62 272 -68 137 2 28 -21 8 14 136 37 32 -21 7 32 137 31 30 -21 8 58 136 8 44 -21 6 39
136 42 5 -22 24 13 13 30 52 62 274 -68 136 54 41 -22 24 33 136 29 31 -22 23 51 137 23 59 -22 25 18 136 0 28 -22 22 58
136 35 9 -23 40 35 13 31 16 61 276 -67 136 47 52 -23 40 56 136 22 28 -23 40 14 137 17 27 -23 41 41 135 53 7 -23 39 20
136 29 12 -24 57 4 13 31 40 61 279 -67 136 42 3 -24 57 25 136 16 23 -24 56 42 137 11 56 -24 58 9 135 46 44 -24 55 49
136 24 16 -26 13 40 13 32 4 61 281 -66 136 37 16 -26 14 1 136 11 19 -26 13 19 137 7 29 -26 14 46 135 41 20 -26 12 25
136 20 25 -27 30 27 13 32 28 61 283 -66 136 33 33 -27 30 48 136 7 18 -27 30 6 137 4 9 -27 31 32 135 36 58 -27 29 12
136 17 40 -28 47 27 13 32 52 60 285 -65 136 30 59 -28 47 47 136 4 23 -28 47 5 137 1 58 -28 48 31 135 33 40 -28 46 12
136 16 6 -30 4 41 13 33 16 60 287 -64 136 29 35 -30 5 1 136 2 38 -30 4 20 137 1 0 -30 5 44 135 31 29 -30 3 27
136 15 46 -31 22 13 13 33 40 59 289 -64 136 29 27 -31 22 32 136 2 6 -31 21 52 137 1 20 -31 23 14 135 30 30 -31 21 0
136 16 45 -32 40 4 13 34 4 59 291 -63 136 30 39 -32 40 23 136 2 52 -32 39 44 137 3 1 -32 41 4 135 30 47 -32 38 53
136 19 9 -33 58 18 13 34 28 58 293 -62 136 33 17 -33 58 37 136 5 2 -33 57 58 137 6 11 -33 59 17 135 32 25 -33 57 8
136 23 3 -35 16 57 13 34 52 58 295 -61 136 37 26 -35 17 15 136 8 42 -35 16 38 137 10 55 -35 17 53 135 35 30 -35 15 49
136 28 35 -36 36 3 13 35 16 57 297 -60 136 43 14 -36 36 21 136 13 57 -36 35 45 137 17 21 -36 36 57 135 40 9 -36 34 58
136 35 53 -37 55 40 13 35 40 56 298 -60 136 50 50 -37 55 57 136 20 58 -37 55 23 137 25 38 -37 56 31 135 46 29 -37 54 37
136 45 7 -39 15 51 13 36 4 55 300 -59 137 0 23 -39 16 6 136 29 53 -39 15 34 137 35 55 -39 16 38 135 54 40 -39 14 51
136 56 28 -40 36 38 13 36 28 54 301 -58 137 12 4 -40 36 52 136 40 53 -40 36 22 137 48 25 -40 37 21 136 4 53 -40 35 42
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