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Updated: 2009 JUN 24, 17:16 UT
Event Rank : 21
(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 Jul 04 UT, the 35 km diameter asteroid (1040) Klumpkea will occult a 12.0 mag star in the constellation Hydra for observers along a large uncertainty path grazing the east coast of Australia, near Brisbane.
In the case of an occultation, the combined light of the asteroid and the star will drop by 4.4 mag to 16.4 mag (the magnitude of the asteroid) for at most 4.2 seconds. Note the nearly full moon only 25 degrees away.
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
150 51 38 -18 0 0 11 14 0 67 235 -51 151 2 29 150 40 48 152 11 13 149 32 49
151 4 34 -19 0 0 11 13 47 67 237 -51 151 15 30 150 53 39 152 24 43 149 45 12
151 18 3 -20 0 0 11 13 34 68 240 -51 151 29 4 151 7 3 152 38 48 149 58 7
151 32 8 -21 0 0 11 13 21 68 242 -52 151 43 14 151 21 3 152 53 31 150 11 35
151 46 49 -22 0 0 11 13 8 68 244 -52 151 58 1 151 35 39 153 8 53 150 25 36
152 2 8 -23 0 0 11 12 54 69 247 -52 152 13 25 151 50 52 153 24 55 150 40 13
152 18 5 -24 0 0 11 12 41 69 249 -53 152 29 29 152 6 43 153 41 39 150 55 26
152 34 43 -25 0 0 11 12 28 69 252 -53 152 46 14 152 23 14 153 59 6 151 11 17
152 52 3 -26 0 0 11 12 14 69 254 -53 153 3 40 152 40 28 154 17 17 151 27 47
153 10 7 -27 0 0 11 12 1 69 257 -54 153 21 52 152 58 24 154 36 16 151 44 58
153 28 56 -28 0 0 11 11 47 69 259 -54 153 40 49 153 17 5 154 56 3 152 2 51
153 48 33 -29 0 0 11 11 34 69 262 -54 154 0 34 153 36 34 155 16 42 152 21 29
154 9 0 -30 0 0 11 11 20 69 264 -54 154 21 10 153 56 52 155 38 14 152 40 52
154 30 19 -31 0 0 11 11 7 69 267 -55 154 42 38 154 18 2 156 0 42 153 1 5
154 52 33 -32 0 0 11 10 53 68 269 -55 155 5 1 154 40 6 156 24 9 153 22 8
155 15 44 -33 0 0 11 10 40 68 272 -55 155 28 23 155 3 7 156 48 37 153 44 5
155 39 56 -34 0 0 11 10 26 68 274 -55 155 52 46 155 27 8 157 14 12 154 6 59
156 5 13 -35 0 0 11 10 13 67 276 -55 156 18 14 155 52 12 157 40 55 154 30 51
156 31 37 -36 0 0 11 9 59 67 278 -55 156 44 51 156 18 24 158 8 52 154 55 46
Uncertainty in time = +/- 13 secs
Prediction of 2009 Jun 25.0
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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