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Updated: 2007 APR 14, 00:22 UT
Event Rank : 46
(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 2007 May 13 UT, the 123 km diameter asteroid (1867) Deiphobus will occult a 8.6 mag star in the constellation Hydra for observers along a path across Australia beginning in South Australia passing near Ceduna and then into Northern Territory passing near Alice Springs before leaving the continent east of Darwin.
In the case of an occultation, the combined light of the asteroid and the star will drop by 7.5 mag to 16.1 mag (the magnitude of the asteroid) for at most 11.1 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: .
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
133 41 42 - 7 0 0 10 40 49 71 182 -26 134 15 6 133 8 18 135 50 1 131 33 24
133 40 19 - 8 0 0 10 40 40 72 182 -26 134 13 48 133 6 50 135 48 55 131 31 43
133 38 55 - 9 0 0 10 40 31 73 182 -26 134 12 29 133 5 21 135 47 50 131 29 59
133 37 29 -10 0 0 10 40 21 74 182 -26 134 11 9 133 3 49 135 46 48 131 28 11
133 36 3 -11 0 0 10 40 11 75 182 -27 134 9 49 133 2 16 135 45 46 131 26 19
133 34 35 -12 0 0 10 40 2 75 181 -27 134 8 28 133 0 41 135 44 45 131 24 23
133 33 5 -13 0 0 10 39 52 76 181 -27 134 7 7 132 59 3 135 43 45 131 22 23
133 31 33 -14 0 0 10 39 42 77 181 -27 134 5 43 132 57 23 135 42 46 131 20 18
133 30 0 -15 0 0 10 39 33 78 181 -27 134 4 19 132 55 40 135 41 48 131 18 9
133 28 23 -16 0 0 10 39 23 79 181 -27 134 2 53 132 53 54 135 40 50 131 15 54
133 26 45 -17 0 0 10 39 13 80 180 -28 134 1 25 132 52 5 135 39 52 131 13 34
133 25 3 -18 0 0 10 39 3 81 180 -28 133 59 54 132 50 12 135 38 54 131 11 8
133 23 18 -19 0 0 10 38 53 82 180 -28 133 58 22 132 48 15 135 37 56 131 8 36
133 21 30 -20 0 0 10 38 43 83 179 -28 133 56 47 132 46 14 135 36 58 131 5 58
133 19 39 -21 0 0 10 38 33 84 178 -28 133 55 9 132 44 8 135 35 59 131 3 13
133 17 43 -22 0 0 10 38 24 85 177 -28 133 53 28 132 41 58 135 35 0 131 0 21
133 15 43 -23 0 0 10 38 14 86 175 -28 133 51 44 132 39 42 135 33 59 130 57 21
133 13 39 -24 0 0 10 38 4 87 171 -28 133 49 56 132 37 22 135 32 58 130 54 13
133 11 30 -25 0 0 10 37 54 87 163 -28 133 48 4 132 34 55 135 31 55 130 50 57
133 9 15 -26 0 0 10 37 44 88 136 -29 133 46 8 132 32 22 135 30 51 130 47 31
133 6 56 -27 0 0 10 37 34 88 53 -29 133 44 7 132 29 43 135 29 45 130 43 57
133 4 30 -28 0 0 10 37 24 87 25 -29 133 42 2 132 26 57 135 28 37 130 40 12
133 1 58 -29 0 0 10 37 14 87 17 -29 133 39 51 132 24 3 135 27 27 130 36 17
132 59 19 -30 0 0 10 37 4 86 14 -29 133 37 35 132 21 2 135 26 15 130 32 11
132 56 33 -31 0 0 10 36 54 85 12 -29 133 35 13 132 17 52 135 25 0 130 27 54
132 53 39 -32 0 0 10 36 44 84 10 -29 133 32 44 132 14 33 135 23 42 130 23 23
132 50 37 -33 0 0 10 36 34 83 9 -29 133 30 9 132 11 5 135 22 20 130 18 40
132 47 27 -34 0 0 10 36 24 82 9 -29 133 27 26 132 7 27 135 20 56 130 13 43
132 44 8 -35 0 0 10 36 14 81 8 -29 133 24 35 132 3 39 135 19 27 130 8 32
132 40 38 -36 0 0 10 36 4 80 8 -29 133 21 36 131 59 39 135 17 54 130 3 4
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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