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Updated: 2006 OCT 03, 04:14 UT
Event Rank : 84
(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 Oct 31 UT, the 83 km diameter asteroid (97) Klotho will occult a 11.8 mag star in the constellation Orion for observers along a wide path across Western Australia and South Australia.
In the case of an occultation, the combined light of the asteroid and the star will drop by only 0.4 mag to 10.8 mag (the magnitude of the asteroid) for at most 12.6 seconds. This event may be not detectable visually.
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
137 5 9 -45 0 0 15 13 26 23 56 -30 135 52 8 138 15 59 134 18 11 139 41 7
136 55 47 -44 0 0 15 13 10 24 56 -31 135 43 39 138 5 47 134 10 51 139 29 54
136 43 51 -43 0 0 15 12 54 24 57 -32 135 32 27 137 53 8 134 0 36 139 16 24
136 29 24 -42 0 0 15 12 38 25 58 -33 135 18 36 137 38 5 133 47 31 139 0 38
136 12 29 -41 0 0 15 12 21 25 58 -34 135 2 9 137 20 42 133 31 39 138 42 40
135 53 8 -40 0 0 15 12 4 25 59 -35 134 43 8 137 1 0 133 13 2 138 22 31
135 31 21 -39 0 0 15 11 47 25 60 -36 134 21 34 136 38 59 132 51 41 138 0 11
135 7 8 -38 0 0 15 11 29 26 61 -38 133 57 26 136 14 39 132 27 35 137 35 41
134 40 27 -37 0 0 15 11 11 26 61 -39 133 30 42 135 47 59 132 0 42 137 8 59
134 11 16 -36 0 0 15 10 53 26 62 -40 133 1 19 135 18 57 131 30 58 136 40 3
133 39 32 -35 0 0 15 10 34 26 63 -41 132 29 12 134 47 29 130 58 17 136 8 51
133 5 8 -34 0 0 15 10 15 26 64 -42 131 54 17 134 13 31 130 22 33 135 35 18
132 27 58 -33 0 0 15 9 55 26 65 -43 131 16 25 133 36 57 129 43 36 134 59 20
131 47 54 -32 0 0 15 9 36 25 66 -44 130 35 26 132 57 39 129 1 14 134 20 50
131 4 45 -31 0 0 15 9 16 25 67 -45 129 51 8 132 15 28 128 15 13 133 39 39
130 18 18 -30 0 0 15 8 55 25 68 -46 129 3 16 131 30 13 127 25 13 132 55 39
129 28 16 -29 0 0 15 8 34 25 69 -47 128 11 31 130 41 39 126 30 50 132 8 38
128 34 20 -28 0 0 15 8 13 24 70 -48 127 15 27 129 49 30 125 31 32 131 18 20
127 36 3 -27 0 0 15 7 52 23 71 -49 126 14 34 128 53 24 124 26 38 130 24 29
126 32 52 -26 0 0 15 7 30 23 72 -50 125 8 11 127 52 53 123 15 12 129 26 42
125 24 5 -25 0 0 15 7 8 22 73 -51 123 55 24 126 47 23 121 55 59 128 24 31
124 8 45 -24 0 0 15 6 45 21 74 -52 122 34 57 125 36 8 120 27 5 127 17 22
122 45 31 -23 0 0 15 6 22 20 75 -52 121 5 2 124 18 7 118 45 37 126 4 27
121 12 28 -22 0 0 15 5 59 19 76 -53 119 22 52 122 51 56 116 46 38 124 44 46
119 26 37 -21 0 0 15 5 35 17 78 -54 117 23 48 121 15 29 114 20 14 123 16 53
117 22 53 -20 0 0 15 5 10 16 79 -54 114 58 43 119 25 32 110 59 23 121 38 43
116 0 0 -19 25 28 15 4 55 14 79 -54 -20 23 40 -18 29 25 -21 39 18 -17 22 34
115 0 0 -19 3 7 15 4 45 13 80 -54 -20 0 28 -18 7 51 -21 14 53 -17 1 52
114 0 0 -18 42 56 15 4 36 13 80 -54 -19 39 31 -17 48 21 -20 52 50 -16 43 8
113 0 0 -18 24 50 15 4 28 12 81 -54 -19 20 44 -17 30 52 -20 33 4 -16 26 20
112 0 0 -18 8 46 15 4 20 11 81 -53 -19 4 3 -17 15 21 -20 15 32 -16 11 26
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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