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Updated: 2009 JAN 22, 17:43 UT
Event Rank : 75
(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 26 UT, the 63 km diameter asteroid (752) Sulamitis will occult a 13.0 mag star in the constellation Cancer for observers along a path across the north-eastern corner of Tasmania, central Victoria, South Australia, passing near Adelaide and directly over Melbourne.
In the case of an occultation, the combined light of the asteroid and the star will drop by only 0.7 mag to 12.8 mag (the magnitude of the asteroid) for at most 6.3 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
153 14 56 -45 0 0 14 32 59 21 358 -26 154 8 24 152 20 49 155 27 29 150 58 22
152 12 17 -44 0 0 14 33 8 22 359 -27 153 5 37 151 18 18 154 24 26 149 56 1
151 8 3 -43 0 0 14 33 17 23 0 -28 152 1 18 150 14 7 153 19 58 148 51 52
150 2 7 -42 0 0 14 33 27 24 1 -29 150 55 22 149 8 9 152 14 1 147 45 48
148 54 23 -41 0 0 14 33 38 25 3 -30 149 47 43 148 0 18 151 6 26 146 37 42
147 44 42 -40 0 0 14 33 48 26 4 -31 148 38 14 146 50 25 149 57 9 145 27 26
146 32 58 -39 0 0 14 34 0 27 5 -33 147 26 45 145 38 22 148 46 1 144 14 51
145 19 0 -38 0 0 14 34 12 28 6 -34 146 13 10 144 23 59 147 32 54 142 59 45
144 2 37 -37 0 0 14 34 25 28 7 -35 144 57 16 143 7 5 146 17 38 141 41 56
142 43 37 -36 0 0 14 34 39 29 9 -36 143 38 52 141 47 24 145 0 2 140 21 8
141 21 45 -35 0 0 14 34 53 30 10 -36 142 17 44 140 24 43 143 39 54 138 57 4
139 56 43 -34 0 0 14 35 8 31 12 -37 140 53 36 138 58 42 142 16 59 137 29 23
138 28 11 -33 0 0 14 35 24 32 13 -38 139 26 10 137 28 59 140 51 0 135 57 39
136 55 46 -32 0 0 14 35 40 32 15 -39 137 55 2 135 55 8 139 21 37 134 21 22
135 18 56 -31 0 0 14 35 58 33 17 -40 136 19 46 134 16 35 137 48 27 132 39 53
133 37 6 -30 0 0 14 36 16 33 19 -41 134 39 49 132 32 39 136 11 0 130 52 23
131 49 28 -29 0 0 14 36 36 34 21 -41 132 54 29 130 42 29 134 28 42 128 57 48
129 55 4 -28 0 0 14 36 56 34 23 -42 131 2 54 128 44 55 132 40 48 126 54 42
127 52 32 -27 0 0 14 37 18 34 25 -42 129 3 53 126 38 24 130 46 21 124 41 5
126 0 0 -26 8 43 14 37 39 34 27 -42 -25 35 15 -26 42 43 -24 46 1 -27 34 48
125 0 0 -25 42 51 14 37 49 34 28 -42 -25 9 39 -26 16 33 -24 20 49 -27 8 11
124 0 0 -25 18 0 14 38 0 34 29 -42 -24 45 4 -25 51 26 -23 56 36 -26 42 37
123 0 0 -24 54 10 14 38 11 34 30 -42 -24 21 29 -25 27 20 -23 33 22 -26 18 6
122 0 0 -24 31 20 14 38 21 34 31 -42 -23 58 53 -25 4 16 -23 11 6 -25 54 39
121 0 0 -24 9 30 14 38 31 34 32 -42 -23 37 17 -24 42 12 -22 49 48 -25 32 13
120 0 0 -23 48 40 14 38 42 34 33 -42 -23 16 39 -24 21 9 -22 29 28 -25 10 49
119 0 0 -23 28 49 14 38 52 34 34 -42 -22 57 0 -24 1 6 -22 10 6 -24 50 27
118 0 0 -23 9 58 14 39 2 33 35 -42 -22 38 20 -23 42 3 -21 51 41 -24 31 5
117 0 0 -22 52 5 14 39 12 33 36 -41 -22 20 37 -23 24 0 -21 34 13 -24 12 45
116 0 0 -22 35 11 14 39 22 33 37 -41 -22 3 52 -23 6 55 -21 17 42 -23 55 25
115 0 0 -22 19 15 14 39 32 32 38 -41 -21 48 5 -22 50 50 -21 2 8 -23 39 5
114 0 0 -22 4 17 14 39 42 32 39 -40 -21 33 16 -22 35 43 -20 47 30 -23 23 44
113 0 0 -21 50 17 14 39 51 32 40 -40 -21 19 23 -22 21 35 -20 33 48 -23 9 24
112 0 0 -21 37 15 14 40 1 31 41 -40 -21 6 28 -22 8 26 -20 21 3 -22 56 3
Uncertainty in time = +/- 5 secs
[Prediction of 2009 Jan 23.0]
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