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Updated: 2005 DEC 28, 00:17 UT
Event Rank : 81
(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 2006 Jan 03 UT, the 44 km diameter asteroid (234) Barbara will occult a 9.7 mag star in the constellation Eridanus for observers along a path across Western Australia, passing near Kalgoorlie.
In the case of an occultation, the combined light of the asteroid and the star will drop by 3.2 mag to 12.8 mag (the magnitude of the asteroid) for at most 5.1 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Ron Stone, 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 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
139 11 24 -44 6 8 15 55 7 17 282 -22 138 29 34 -44 7 46 139 54 23 -44 4 25 137 35 57 -44 9 49 140 53 6 -44 2 2
136 23 31 -42 51 37 15 55 20 19 284 -23 135 46 15 -42 52 59 137 1 37 -42 50 13 134 58 11 -42 54 41 137 53 14 -42 48 15
134 1 24 -41 37 17 15 55 33 21 285 -25 133 27 24 -41 38 27 134 36 1 -41 36 5 132 43 24 -41 39 55 135 22 43 -41 34 26
131 58 29 -40 23 24 15 55 47 23 286 -26 131 26 59 -40 24 25 132 30 29 -40 22 22 130 46 5 -40 25 42 133 13 31 -40 20 56
130 10 34 -39 10 6 15 56 0 25 287 -28 129 41 2 -39 10 59 130 40 31 -39 9 11 129 2 38 -39 12 7 131 20 41 -39 7 55
128 34 45 -37 57 26 15 56 13 26 287 -29 128 6 49 -37 58 14 129 3 1 -37 56 37 127 30 27 -37 59 15 129 40 53 -37 55 30
127 8 55 -36 45 27 15 56 26 28 288 -30 126 42 20 -36 46 10 127 35 48 -36 44 42 126 7 40 -36 47 5 128 11 45 -36 43 42
125 51 29 -35 34 8 15 56 40 29 288 -32 125 26 2 -35 34 47 126 17 11 -35 33 27 124 52 49 -35 35 37 126 51 32 -35 32 32
124 41 13 -34 23 29 15 56 53 30 288 -33 124 16 45 -34 24 4 125 5 56 -34 22 52 123 44 48 -34 24 50 125 38 54 -34 22 1
123 37 11 -33 13 28 15 57 6 31 288 -34 123 13 34 -33 14 1 124 1 0 -33 12 54 122 42 42 -33 14 43 124 32 47 -33 12 8
122 38 34 -32 4 5 15 57 19 32 288 -35 122 15 42 -32 4 35 123 1 37 -32 3 33 121 45 47 -32 5 14 123 32 22 -32 2 50
121 44 44 -30 55 17 15 57 33 34 288 -36 121 22 32 -30 55 46 122 7 7 -30 54 48 120 53 28 -30 56 22 122 36 56 -30 54 8
120 55 10 -29 47 4 15 57 46 35 288 -38 120 33 33 -29 47 31 121 16 57 -29 46 37 120 5 15 -29 48 5 121 45 57 -29 46 0
120 9 25 -28 39 23 15 57 59 35 288 -39 119 48 19 -28 39 48 120 30 40 -28 38 58 119 20 42 -28 40 20 120 58 56 -28 38 23
119 27 7 -27 32 13 15 58 12 36 287 -40 119 6 30 -27 32 36 119 47 52 -27 31 49 118 39 29 -27 33 6 120 15 30 -27 31 16
118 47 56 -26 25 32 15 58 26 37 287 -41 118 27 44 -26 25 54 119 8 15 -26 25 9 118 1 17 -26 26 22 119 35 17 -26 24 38
118 11 36 -25 19 18 15 58 39 38 286 -42 117 51 48 -25 19 39 118 31 31 -25 18 56 117 25 50 -25 20 5 118 58 2 -25 18 27
117 37 53 -24 13 29 15 58 52 39 286 -43 117 18 26 -24 13 49 117 57 27 -24 13 9 116 52 56 -24 14 14 118 23 28 -24 12 41
117 6 34 -23 8 5 15 59 5 39 285 -44 116 47 26 -23 8 24 117 25 49 -23 7 45 116 22 21 -23 8 48 117 51 24 -23 7 19
116 37 29 -22 3 3 15 59 19 40 285 -45 116 18 39 -22 3 21 116 56 26 -22 2 44 115 53 57 -22 3 44 117 21 37 -22 2 19
116 10 29 -20 58 22 15 59 32 41 284 -46 115 51 55 -20 58 39 116 29 10 -20 58 4 115 27 33 -20 59 1 116 53 59 -20 57 39
115 45 25 -19 54 0 15 59 45 41 283 -47 115 27 5 -19 54 16 116 3 51 -19 53 43 115 3 2 -19 54 38 116 28 21 -19 53 19
115 22 10 -18 49 56 15 59 58 42 283 -48 115 4 4 -18 50 12 115 40 23 -18 49 40 114 40 18 -18 50 32 116 4 34 -18 49 17
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