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Updated: 2007 OCT 25, 14:52 UT
Event Rank : 100
(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 26 UT, the 255 km diameter asteroid (15) Eunomia will occult a 11.2 mag star in the constellation Cancer for observers along a path over Papau New Guinea and Central Australia.
In the case of an occultation, the combined light of the asteroid and the star will drop by 0.1 mag to 9.1 mag (the magnitude of the asteroid) for at most 93.0 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
125 2 0 -36 0 0 18 20 3 27 15 -20 123 21 9 126 42 56 122 56 58 127 7 11
125 38 26 -35 0 0 18 19 42 28 15 -20 123 58 44 127 18 16 123 34 49 127 42 15
126 14 39 -34 0 0 18 19 20 29 15 -21 124 36 2 127 53 26 124 12 23 128 17 10
126 50 41 -33 0 0 18 18 58 31 14 -21 125 13 5 128 28 28 124 49 40 128 51 58
127 26 34 -32 0 0 18 18 34 32 14 -22 125 49 54 129 3 24 125 26 44 129 26 41
128 2 18 -31 0 0 18 18 10 33 14 -22 126 26 33 129 38 16 126 3 35 130 1 20
128 37 56 -30 0 0 18 17 46 34 13 -22 127 3 2 130 13 4 126 40 17 130 35 56
129 13 30 -29 0 0 18 17 20 35 13 -23 127 39 23 130 47 51 127 16 50 131 10 32
129 49 1 -28 0 0 18 16 54 36 13 -23 128 15 39 131 22 38 127 53 17 131 45 9
130 24 30 -27 0 0 18 16 27 37 12 -23 128 51 50 131 57 26 128 29 38 132 19 47
130 59 59 -26 0 0 18 16 0 38 12 -24 129 27 59 132 32 16 129 5 56 132 54 28
131 35 29 -25 0 0 18 15 32 39 11 -24 130 4 6 133 7 10 129 42 12 133 29 13
132 11 1 -24 0 0 18 15 3 40 11 -24 130 40 12 133 42 9 130 18 27 134 4 4
132 46 37 -23 0 0 18 14 33 41 11 -25 131 16 20 134 17 13 130 54 42 134 39 1
133 22 17 -22 0 0 18 14 3 42 10 -25 131 52 30 134 52 25 131 30 59 135 14 6
133 58 3 -21 0 0 18 13 32 43 10 -25 132 28 43 135 27 44 132 7 19 135 49 19
134 33 56 -20 0 0 18 13 1 44 9 -26 133 5 1 136 3 13 132 43 44 136 24 42
135 9 57 -19 0 0 18 12 29 45 9 -26 133 41 25 136 38 52 133 20 13 137 0 16
135 46 7 -18 0 0 18 11 56 46 9 -26 134 17 56 137 14 41 133 56 49 137 36 1
136 22 27 -17 0 0 18 11 23 48 8 -26 134 54 34 137 50 43 134 33 32 138 11 58
136 58 57 -16 0 0 18 10 49 49 8 -26 135 31 22 138 26 58 135 10 24 138 48 9
137 35 40 -15 0 0 18 10 14 50 7 -27 136 8 19 139 3 26 135 47 25 139 24 35
138 12 35 -14 0 0 18 9 39 51 7 -27 136 45 27 139 40 10 136 24 36 140 1 15
138 49 45 -13 0 0 18 9 4 52 6 -27 137 22 48 140 17 9 137 1 59 140 38 12
139 27 9 -12 0 0 18 8 27 53 5 -27 138 0 21 140 54 26 137 39 35 141 15 27
140 4 49 -11 0 0 18 7 51 54 5 -27 138 38 8 141 32 0 138 17 24 141 52 59
140 42 47 -10 0 0 18 7 13 55 4 -27 139 16 11 142 9 52 138 55 28 142 30 51
141 21 2 - 9 0 0 18 6 35 56 4 -27 139 54 29 142 48 5 139 33 47 143 9 3
141 59 35 - 8 0 0 18 5 57 57 3 -27 140 33 4 143 26 38 140 12 22 143 47 37
142 38 29 - 7 0 0 18 5 18 58 2 -27 141 11 57 144 5 33 140 51 16 144 26 32
143 17 44 - 6 0 0 18 4 39 59 1 -27 141 51 9 144 44 51 141 30 27 145 5 51
143 57 20 - 5 0 0 18 3 59 60 1 -27 142 30 42 145 24 33 142 9 59 145 45 35
144 37 20 - 4 0 0 18 3 18 61 360 -27 143 10 35 146 4 40 142 49 51 146 25 44
145 17 44 - 3 0 0 18 2 37 62 359 -27 143 50 51 146 45 14 143 30 5 147 6 19
145 58 33 - 2 0 0 18 1 56 63 358 -27 144 31 30 147 26 14 144 10 42 147 47 23
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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