|
|
Updated: 2009 JAN 19, 12:07 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 2009 Jan 24 UT, the 151 km diameter asteroid (145) Adeona will occult a 11.9 mag star in the constellation Taurus for observers along a path running along the eastern border of Western Australia.
In the case of an occultation, the combined light of the asteroid and the star will drop by 0.9 mag to 12.1 mag (the magnitude of the asteroid) for at most 36.8 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, 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 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 11 48 -41 0 0 14 55 41 4 307 -30 140 11 49 134 36 29 141 34 13 133 39 16
135 52 51 -40 0 0 14 55 47 5 308 -31 138 37 17 133 27 59 139 50 48 132 34 6
134 43 24 -39 0 0 14 55 54 6 308 -32 137 15 58 132 26 57 138 23 6 131 35 49
133 41 49 -38 0 0 14 56 3 7 309 -33 136 4 59 131 32 18 137 7 16 130 43 30
132 46 54 -37 0 0 14 56 13 9 309 -34 135 2 25 130 43 13 136 0 52 129 56 23
131 57 45 -36 0 0 14 56 25 10 310 -35 134 6 56 129 59 1 135 2 16 129 13 54
131 13 41 -35 0 0 14 56 37 11 310 -36 133 17 30 129 19 12 134 10 16 128 35 33
130 34 6 -34 0 0 14 56 50 12 310 -36 132 33 22 128 43 19 133 23 58 128 0 59
129 58 36 -33 0 0 14 57 4 13 311 -37 131 53 56 128 11 3 132 42 41 127 29 51
129 26 47 -32 0 0 14 57 18 14 311 -38 131 18 43 127 42 4 132 5 53 127 1 52
128 58 22 -31 0 0 14 57 34 15 311 -39 130 47 19 127 16 8 131 33 8 126 36 50
128 33 4 -30 0 0 14 57 50 16 311 -40 130 19 26 126 53 2 131 4 4 126 14 32
128 10 42 -29 0 0 14 58 7 16 311 -41 129 54 48 126 32 36 130 38 25 125 54 48
127 51 4 -28 0 0 14 58 25 17 311 -42 129 33 11 126 14 40 130 15 54 125 37 29
127 34 1 -27 0 0 14 58 43 18 311 -43 129 14 24 125 59 7 129 56 21 125 22 29
127 19 26 -26 0 0 14 59 2 19 310 -44 128 58 19 125 45 50 129 39 35 125 9 41
127 7 11 -25 0 0 14 59 22 19 310 -45 128 44 46 125 34 44 129 25 29 124 59 0
126 57 11 -24 0 0 14 59 42 20 310 -46 128 33 41 125 25 42 129 13 54 124 50 20
126 49 22 -23 0 0 15 0 3 21 310 -47 128 24 56 125 18 43 129 4 45 124 43 39
126 43 40 -22 0 0 15 0 25 21 309 -48 128 18 29 125 13 42 128 57 58 124 38 53
126 40 3 -21 0 0 15 0 47 22 309 -49 128 14 16 125 10 37 128 53 29 124 36 1
126 38 27 -20 0 0 15 1 10 23 309 -50 128 12 13 125 9 25 128 51 16 124 34 59
126 38 51 -19 0 0 15 1 34 23 308 -51 128 12 21 125 10 7 128 51 17 124 35 46
126 41 16 -18 0 0 15 1 58 24 308 -52 128 14 37 125 12 40 128 53 30 124 38 23
126 45 39 -17 0 0 15 2 22 24 308 -53 128 19 3 125 17 4 128 57 57 124 42 49
126 52 3 -16 0 0 15 2 48 25 307 -54 128 25 37 125 23 21 129 4 37 124 49 4
127 0 29 -15 0 0 15 3 14 25 307 -55 128 34 23 125 31 31 129 13 33 124 57 9
127 10 57 -14 0 0 15 3 40 25 306 -56 128 45 22 125 41 36 129 24 47 125 7 5
127 23 32 -13 0 0 15 4 7 26 306 -57 128 58 38 125 53 38 129 38 22 125 18 56
127 38 16 -12 0 0 15 4 35 26 305 -58 129 14 15 126 7 39 129 54 25 125 32 43
127 55 14 -11 0 0 15 5 3 26 304 -59 129 32 20 126 23 45 130 13 0 125 48 30
128 14 33 -10 0 0 15 5 33 26 304 -60 129 52 58 126 41 59 130 34 16 126 6 22
Uncertainty in time = +/- 8 secs
[Prediction of 2009 Jan 19.0]
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]