|
|
Updated: 2008 APR 26, 20:14 UT
Event Rank : 97
(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 2008 May 26 UT, the 81 km diameter asteroid (914) Palisana will occult a 12.0 mag star in the constellation Andromeda for observers along a path across north-west Western Australia passing near Carnarvon, Port Hedland and Broome.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 13.4 mag (the magnitude of the asteroid) for at most 2.1 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, 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
106 4 22 -30 0 0 21 34 56 18 46 -27 106 45 3 105 23 32 107 16 41 104 51 35
107 27 29 -29 0 0 21 34 58 20 46 -25 108 7 30 106 47 21 108 38 38 106 15 57
108 48 54 -28 0 0 21 35 0 21 45 -24 109 28 18 108 9 23 109 58 58 107 38 29
110 8 46 -27 0 0 21 35 1 23 44 -23 110 47 36 109 29 49 111 17 50 108 59 23
111 27 13 -26 0 0 21 35 3 24 44 -21 112 5 33 110 48 49 112 35 23 110 18 47
112 44 24 -25 0 0 21 35 5 26 43 -20 113 22 16 112 6 28 113 51 45 111 36 50
114 0 26 -24 0 0 21 35 7 27 42 -18 114 37 52 113 22 57 115 7 1 112 53 40
115 15 26 -23 0 0 21 35 9 29 42 -17 115 52 28 114 38 21 116 21 20 114 9 23
116 29 31 -22 0 0 21 35 12 30 41 -16 117 6 12 115 52 47 117 34 47 115 24 7
117 42 45 -21 0 0 21 35 14 32 41 -14 118 19 7 117 6 22 118 47 28 116 37 57
118 55 17 -20 0 0 21 35 17 33 40 -13 119 31 21 118 19 11 119 59 28 117 51 0
120 7 9 -19 0 0 21 35 19 35 39 -12 120 42 58 119 31 19 121 10 54 119 3 22
121 18 29 -18 0 0 21 35 22 36 39 -10 121 54 5 120 42 53 122 21 50 120 15 7
122 29 21 -17 0 0 21 35 25 38 38 -9 123 4 45 121 53 58 123 32 21 121 26 21
123 39 50 -16 0 0 21 35 28 39 38 -7 124 15 3 123 4 37 124 42 32 122 37 10
124 50 1 -15 0 0 21 35 31 41 37 -6 125 25 5 124 14 57 125 52 28 123 47 37
125 59 58 -14 0 0 21 35 34 42 37 -4 126 34 55 125 25 1 127 2 13 124 57 47
127 9 46 -13 0 0 21 35 37 44 36 -3 127 44 38 126 34 55 128 11 51 126 7 46
128 19 29 -12 0 0 21 35 40 45 35 -2 128 54 17 127 44 43 129 21 28 127 17 37
129 29 12 -11 0 0 21 35 43 47 35 0 130 3 58 128 54 29 130 31 8 128 27 25
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
[Timing Details]
[Reporting Details]
[Report Form]
[Asteroid Occultation Results]
[Top of Page][Return to Home Page]