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Updated: 2006 AUG 11, 03:43 UT
Event Rank : 99
(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 Sep 16 UT, the 149 km diameter asteroid (117) Lomia will occult a 10.1 mag star in the constellation Aries for observers along a wide path across central Australia from just to the west of Adelaide past Alice Springs to Darwin.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 12.9 mag (the magnitude of the asteroid) for at most 19.2 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 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
133 15 37 -42 0 0 14 51 28 6 41 -51 135 28 37 130 51 47 136 41 44 129 22 6
133 54 43 -41 0 0 14 51 32 8 40 -52 136 3 4 131 36 38 137 13 50 130 11 0
134 28 45 -40 0 0 14 51 37 9 40 -53 136 33 2 132 15 36 137 41 44 130 53 24
134 58 11 -39 0 0 14 51 42 10 40 -54 136 58 55 132 49 19 138 5 48 131 30 2
135 23 27 -38 0 0 14 51 48 11 39 -55 137 21 2 133 18 18 138 26 19 132 1 32
135 44 52 -37 0 0 14 51 54 12 39 -56 137 39 41 133 42 58 138 43 31 132 28 24
136 2 43 -36 0 0 14 52 1 13 39 -57 137 55 5 134 3 41 138 57 39 132 51 0
136 17 14 -35 0 0 14 52 8 13 39 -58 138 7 26 134 20 43 139 8 52 133 9 42
136 28 39 -34 0 0 14 52 16 14 39 -59 138 16 55 134 34 20 139 17 20 133 24 46
136 37 6 -33 0 0 14 52 24 15 39 -60 138 23 41 134 44 43 139 23 12 133 36 25
136 42 46 -32 0 0 14 52 32 16 39 -61 138 27 51 134 52 4 139 26 35 133 44 52
136 45 44 -31 0 0 14 52 41 17 39 -62 138 29 32 134 56 31 139 27 33 133 50 15
136 46 9 -30 0 0 14 52 50 18 39 -63 138 28 48 134 58 11 139 26 14 133 52 43
136 44 4 -29 0 0 14 53 0 18 40 -64 138 25 46 134 57 10 139 22 40 133 52 24
136 39 34 -28 0 0 14 53 10 19 40 -65 138 20 28 134 53 33 139 16 56 133 49 21
136 32 44 -27 0 0 14 53 20 20 40 -66 138 12 58 134 47 25 139 9 4 133 43 39
136 23 34 -26 0 0 14 53 31 21 40 -67 138 3 17 134 38 48 138 59 7 133 35 22
136 12 8 -25 0 0 14 53 42 21 41 -68 137 51 29 134 27 45 138 47 6 133 24 32
135 58 26 -24 0 0 14 53 54 22 41 -69 137 37 34 134 14 16 138 33 2 133 11 10
135 42 29 -23 0 0 14 54 6 23 42 -70 137 21 32 133 58 23 138 16 57 132 55 17
135 24 17 -22 0 0 14 54 18 23 42 -71 137 3 23 133 40 4 137 58 48 132 36 53
135 3 49 -21 0 0 14 54 31 24 43 -72 136 43 7 133 19 18 137 38 38 132 15 54
134 41 3 -20 0 0 14 54 44 24 43 -73 136 20 42 132 56 4 137 16 22 131 52 20
134 15 56 -19 0 0 14 54 58 25 44 -74 135 56 6 132 30 18 136 52 1 131 26 6
133 48 26 -18 0 0 14 55 12 25 44 -75 135 29 16 132 1 56 136 25 32 130 57 8
133 18 27 -17 0 0 14 55 27 26 45 -76 135 0 9 131 30 53 135 56 50 130 25 20
132 45 54 -16 0 0 14 55 41 26 45 -76 134 28 40 130 57 1 135 25 52 129 50 32
132 10 41 -15 0 0 14 55 57 26 46 -77 133 54 43 130 20 12 134 52 34 129 12 37
131 32 38 -14 0 0 14 56 13 27 47 -78 133 18 13 129 40 16 134 16 48 128 31 21
130 51 37 -13 0 0 14 56 29 27 47 -79 132 38 59 128 56 59 133 38 28 127 46 29
130 7 24 -12 0 0 14 56 46 27 48 -80 131 56 54 128 10 7 132 57 25 126 57 42
129 19 45 -11 0 0 14 57 3 27 49 -80 131 11 44 127 19 18 132 13 28 126 4 38
128 28 21 -10 0 0 14 57 21 27 50 -81 130 23 16 126 24 8 131 26 26 125 6 44
127 32 50 - 9 0 0 14 57 40 27 51 -81 129 31 12 125 24 7 130 36 2 124 3 23
126 32 43 - 8 0 0 14 57 59 27 51 -81 128 35 11 124 18 31 129 41 58 122 53 41
Use these links for further information:
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