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Updated: 2007 OCT 15, 14:15 UT
Event Rank : 33
(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 Nov 16 UT, the 45 km diameter asteroid (1637) Swings will occult a 11.5 mag star in the constellation Auriga for observers along a path across Western Australia passing near Esperance, Kalgoorlie and ending near Port Headland and Karratha.
In the case of an occultation, the combined light of the asteroid and the star will drop by 4.5 mag to 16.0 mag (the magnitude of the asteroid) for at most 4.8 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
124 24 58 -40 0 0 18 31 59 10 360 -17 124 46 58 124 2 54 126 15 54 122 31 55
124 10 40 -39 0 0 18 32 2 11 360 -18 124 32 25 123 48 51 126 0 19 122 18 55
123 55 27 -38 0 0 18 32 5 12 360 -19 124 16 57 123 33 51 125 43 54 122 4 54
123 39 19 -37 0 0 18 32 9 13 0 -20 124 0 36 123 17 57 125 26 40 121 49 54
123 22 18 -36 0 0 18 32 12 14 0 -21 123 43 23 123 1 8 125 8 37 121 33 56
123 4 24 -35 0 0 18 32 16 15 1 -21 123 25 17 122 43 25 124 49 46 121 16 59
122 45 37 -34 0 0 18 32 21 16 1 -22 123 6 21 122 24 49 124 30 7 120 59 7
122 26 0 -33 0 0 18 32 25 17 1 -23 122 46 34 122 5 21 124 9 41 120 40 18
122 5 31 -32 0 0 18 32 30 18 1 -24 122 25 56 121 45 1 123 48 28 120 20 34
121 44 11 -31 0 0 18 32 36 19 2 -25 122 4 28 121 23 49 123 26 28 119 59 54
121 22 0 -30 0 0 18 32 41 20 2 -26 121 42 10 121 1 45 123 3 40 119 38 19
120 58 58 -29 0 0 18 32 47 21 2 -27 121 19 1 120 38 49 122 40 5 119 15 49
120 35 4 -28 0 0 18 32 53 22 3 -28 120 55 2 120 15 1 122 15 43 118 52 24
120 10 19 -27 0 0 18 32 59 23 3 -29 120 30 12 119 50 21 121 50 33 118 28 4
119 44 42 -26 0 0 18 33 6 24 3 -30 120 4 31 119 24 48 121 24 34 118 2 47
119 18 12 -25 0 0 18 33 13 25 4 -31 119 37 57 118 58 21 120 57 46 117 36 34
118 50 48 -24 0 0 18 33 20 26 4 -32 119 10 31 118 31 1 120 30 9 117 9 23
118 22 31 -23 0 0 18 33 28 27 4 -33 118 42 12 118 2 45 120 1 41 116 41 15
117 53 18 -22 0 0 18 33 35 28 5 -34 118 12 58 117 33 34 119 32 21 116 12 8
117 23 10 -21 0 0 18 33 44 29 5 -35 117 42 49 117 3 25 119 2 9 115 42 0
116 52 3 -20 0 0 18 33 52 30 6 -36 117 11 43 116 32 19 118 31 3 115 10 51
116 19 58 -19 0 0 18 34 1 31 6 -37 116 39 38 116 0 12 117 59 2 114 38 39
115 46 52 -18 0 0 18 34 10 32 7 -38 116 6 34 115 27 4 117 26 5 114 5 22
115 12 44 -17 0 0 18 34 19 33 7 -39 115 32 29 114 52 54 116 52 9 113 30 58
114 37 32 -16 0 0 18 34 29 34 8 -40 114 57 20 114 17 38 116 17 13 112 55 26
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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