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Updated: 2009 FEB 05, 22:59 UT
Event Rank : 98
(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 2009 Feb 19 UT, the 116 km diameter asteroid (105) Artemis will occult a 10.4 mag star in the constellation Monoceros for observers along a path across Australia, from Adelaide in South Australia to just east of Darwin in The Northern Territory.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 13.2 mag (the magnitude of the asteroid) for at most 11.1 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, 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
131 21 30 - 9 0 0 12 22 25 77 289 -40 131 54 22 130 48 42 132 18 45 130 24 28
131 32 58 -10 0 0 12 22 14 77 293 -39 132 5 58 131 0 4 132 30 25 130 35 45
131 44 43 -11 0 0 12 22 4 76 297 -39 132 17 50 131 11 41 132 42 23 130 47 17
131 56 45 -12 0 0 12 21 53 75 300 -39 132 30 0 131 23 35 132 54 39 130 59 4
132 9 4 -13 0 0 12 21 42 75 302 -39 132 42 28 131 35 45 133 7 14 131 11 8
132 21 41 -14 0 0 12 21 32 74 305 -38 132 55 15 131 48 12 133 20 9 131 23 29
132 34 37 -15 0 0 12 21 21 73 307 -38 133 8 22 132 0 58 133 33 23 131 36 7
132 47 52 -16 0 0 12 21 11 73 310 -38 133 21 48 132 14 2 133 46 58 131 49 2
133 1 27 -17 0 0 12 21 0 72 312 -37 133 35 35 132 27 25 134 0 54 132 2 17
133 15 23 -18 0 0 12 20 50 71 313 -37 133 49 44 132 41 8 134 15 12 132 15 50
133 29 40 -19 0 0 12 20 40 70 315 -37 134 4 15 132 55 11 134 29 53 132 29 44
133 44 20 -20 0 0 12 20 29 69 316 -36 134 19 9 133 9 36 134 44 58 132 43 58
133 59 22 -21 0 0 12 20 19 68 318 -36 134 34 27 133 24 23 135 0 28 132 58 34
134 14 49 -22 0 0 12 20 9 68 319 -36 134 50 10 133 39 34 135 16 24 133 13 32
134 30 41 -23 0 0 12 19 59 67 320 -35 135 6 19 133 55 8 135 32 46 133 28 54
134 46 59 -24 0 0 12 19 48 66 321 -35 135 22 56 134 11 8 135 49 36 133 44 40
135 3 44 -25 0 0 12 19 38 65 322 -34 135 40 1 134 27 34 136 6 56 134 0 52
135 20 58 -26 0 0 12 19 28 64 323 -34 135 57 36 134 44 27 136 24 46 134 17 30
135 38 42 -27 0 0 12 19 18 63 323 -34 136 15 42 135 1 50 136 43 9 134 34 37
135 56 58 -28 0 0 12 19 9 62 324 -33 136 34 20 135 19 42 137 2 5 134 52 12
136 15 46 -29 0 0 12 18 59 61 325 -33 136 53 34 135 38 7 137 21 36 135 10 19
136 35 10 -30 0 0 12 18 49 60 325 -32 137 13 23 135 57 4 137 41 45 135 28 58
136 55 10 -31 0 0 12 18 39 59 326 -32 137 33 50 136 16 37 138 2 32 135 48 11
137 15 48 -32 0 0 12 18 30 58 326 -31 137 54 57 136 36 47 138 24 1 136 8 1
137 37 7 -33 0 0 12 18 20 57 326 -31 138 16 46 136 57 36 138 46 13 136 28 28
137 59 9 -34 0 0 12 18 11 56 327 -31 138 39 20 137 19 6 139 9 11 136 49 35
138 21 56 -35 0 0 12 18 2 55 327 -30 139 2 41 137 41 20 139 32 57 137 11 24
138 45 31 -36 0 0 12 17 53 54 327 -30 139 26 52 138 4 20 139 57 35 137 33 58
139 9 57 -37 0 0 12 17 43 53 327 -29 139 51 56 138 28 9 140 23 7 137 57 20
139 35 17 -38 0 0 12 17 34 52 327 -29 140 17 56 138 52 50 140 49 37 138 21 32
140 1 35 -39 0 0 12 17 25 51 328 -28 140 44 56 139 18 26 141 17 9 138 46 38
140 28 54 -40 0 0 12 17 17 50 328 -28 141 13 0 139 45 1 141 45 46 139 12 40
140 57 19 -41 0 0 12 17 8 49 328 -27 141 42 12 140 12 39 142 15 34 139 39 44
Uncertainty in time = +/- 4 secs
[Prediction of 2009 Feb 6.0]
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