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Updated: 2006 JUN 12, 21:46 UT
Event Rank : 90
(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 2006 Jun 25 UT, the 74 km diameter asteroid (735) Marghanna will occult a 11.3 mag star in the constellation Ara for observers along a path across south-western Queensland, western New South Wales and Victoria, passing near Mildura, and south-eastern South Australia, passing near Mount Gambier.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 12.7 mag (the magnitude of the asteroid) for at most 6.9 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 Limit1 Path Limit2 Error Limit1 Error Limit2
E. Longitude Latitude U.T. Alt Az Alt
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' "
Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude
143 51 41 -30 12 16 20 53 42 13 224 -6 145 1 30 -29 27 11 142 46 18 -30 52 0 146 20 37 -28 32 31 141 41 54 -31 28 52
142 29 26 -32 24 24 20 53 51 15 225 -8 143 31 51 -31 48 24 141 29 42 -32 57 1 144 40 21 -31 6 29 140 29 55 -33 27 54
141 21 15 -34 21 9 20 54 1 17 226 -10 142 19 28 -33 50 40 140 24 55 -34 49 8 143 22 21 -33 15 54 139 28 2 -35 15 59
140 22 40 -36 7 31 20 54 11 19 227 -11 141 18 12 -35 40 52 139 28 33 -36 32 14 142 17 41 -35 10 48 138 33 34 -36 56 7
139 31 13 -37 46 20 20 54 21 20 228 -12 140 24 59 -37 22 29 138 38 34 -38 8 34 141 22 13 -36 55 47 137 44 53 -38 30 9
138 45 24 -39 19 18 20 54 30 22 228 -13 139 37 58 -38 57 37 137 53 44 -39 39 35 140 33 43 -38 33 28 137 0 54 -39 59 21
138 4 12 -40 47 35 20 54 40 23 229 -14 138 55 59 -40 27 38 137 13 11 -41 6 18 139 50 44 -40 5 30 136 20 53 -41 24 34
137 26 56 -42 12 0 20 54 50 24 230 -15 138 18 14 -41 53 29 136 36 18 -42 29 26 139 12 20 -41 32 59 135 44 17 -42 46 28
136 53 6 -43 33 12 20 54 59 26 231 -16 137 44 9 -43 15 52 136 2 38 -43 49 32 138 37 53 -42 56 42 135 10 44 -44 5 31
136 22 20 -44 51 38 20 55 9 27 231 -17 137 13 19 -44 35 18 135 31 52 -45 7 2 138 6 55 -44 17 15 134 39 54 -45 22 7
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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