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Updated: 2005 AUG 18, 23:02 UT
Event Rank : 74
(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 26 UT, the 41 km diameter asteroid (686) Gersuind will occult a 10.3 mag star in the constellation Andromeda for observers along a path across Queensland and north-eastern New South Wales.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 12.4 mag (the magnitude of the asteroid) for at most 17.2 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
156 9 11 -35 0 0 14 8 4 22 18 -64 156 37 54 155 40 13 157 21 42 154 55 9
155 34 8 -34 0 0 14 8 38 23 19 -65 156 2 48 155 5 14 156 46 30 154 20 15
154 57 8 -33 0 0 14 9 14 24 19 -66 155 25 46 154 28 15 156 9 26 153 43 18
154 18 9 -32 0 0 14 9 51 25 20 -68 154 46 48 153 49 16 155 30 27 153 4 18
153 37 10 -31 0 0 14 10 29 26 20 -69 154 5 50 153 8 14 154 49 32 152 23 12
152 54 7 -30 0 0 14 11 9 26 21 -70 153 22 52 152 25 8 154 6 39 151 39 58
152 8 59 -29 0 0 14 11 51 27 22 -71 152 37 49 151 39 53 153 21 45 150 54 33
151 21 42 -28 0 0 14 12 34 28 22 -72 151 50 41 150 52 27 152 34 48 150 6 53
150 32 12 -27 0 0 14 13 19 29 23 -73 151 1 21 150 2 46 151 45 43 149 16 54
149 40 24 -26 0 0 14 14 6 29 24 -74 150 9 46 149 10 45 150 54 26 148 24 31
148 46 13 -25 0 0 14 14 54 30 25 -75 149 15 50 148 16 18 150 0 53 147 29 37
147 49 31 -24 0 0 14 15 44 31 26 -76 148 19 27 147 19 17 149 4 57 146 32 6
146 50 13 -23 0 0 14 16 36 31 27 -77 147 20 29 146 19 36 148 6 30 145 31 48
145 48 7 -22 0 0 14 17 30 32 28 -78 146 18 49 145 17 5 147 5 26 144 28 34
144 43 5 -21 0 0 14 18 26 32 29 -79 145 14 16 144 11 32 146 1 35 143 22 12
143 34 54 -20 0 0 14 19 24 33 30 -80 144 6 38 143 2 46 144 54 46 142 12 29
142 23 19 -19 0 0 14 20 24 33 31 -81 142 55 42 141 50 31 143 44 46 140 59 7
141 8 4 -18 0 0 14 21 26 33 32 -81 141 41 12 140 34 29 142 31 21 139 41 48
139 48 48 -17 0 0 14 22 31 34 33 -82 140 22 47 139 14 18 141 14 11 138 20 7
138 25 4 -16 0 0 14 23 38 34 35 -82 139 0 4 137 49 31 139 52 56 136 53 34
136 56 24 -15 0 0 14 24 49 34 36 -81 137 32 35 136 19 35 138 27 9 135 21 33
135 22 7 -14 0 0 14 26 2 34 37 -81 135 59 42 134 43 48 136 56 17 133 43 15
133 41 24 -13 0 0 14 27 19 34 39 -80 134 20 41 133 1 16 135 19 40 131 57 40
131 53 8 -12 0 0 14 28 40 34 40 -79 132 34 30 131 10 46 133 36 25 130 3 22
129 55 52 -11 0 0 14 30 6 34 42 -77 130 39 50 129 10 40 131 45 22 127 58 22
127 47 26 -10 0 0 14 31 37 33 43 -75 128 34 46 126 58 32 129 44 55 125 39 43
Latitude Latitude Latitude Latitude
126 0 0 - 9 14 13 14 32 51 33 45 -74 - 8 53 16 - 9 35 22 - 8 21 23 -10 8 21
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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