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Updated: 2014 OCT 27, 10:06 UT
Event Rank : 52
(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 2014 Nov 20 UT, the 46 km diameter asteroid (397) Vienna will occult a 12.2 mag star in the constellation Canis Minor for observers along a path across Australia through northern Northern Territory and central WA.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 13.5 mag (the magnitude of the asteroid) for at most 6.7 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, 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
140 10 41 - 7 33 20 15 1 27 38 73 -61 140 29 22 - 7 34 7 139 51 52 - 7 32 35 141 14 29 - 7 36 6 139 5 24 - 7 30 51
139 32 55 - 8 40 50 15 1 44 37 73 -60 139 51 52 - 8 41 34 139 13 50 - 8 40 7 140 37 35 - 8 43 29 138 26 43 - 8 38 29
138 52 49 - 9 48 56 15 2 1 36 72 -59 139 12 3 - 9 49 37 138 33 26 - 9 48 15 139 58 27 - 9 51 26 137 45 33 - 9 46 44
138 10 9 -10 57 41 15 2 18 35 72 -58 138 29 43 -10 58 20 137 50 26 -10 57 4 139 16 53 -11 0 3 137 1 40 -10 55 40
137 24 41 -12 7 11 15 2 35 34 71 -58 137 44 38 -12 7 47 137 4 34 -12 6 37 138 32 40 -12 9 22 136 14 49 -12 5 21
136 36 6 -13 17 28 15 2 52 33 71 -57 136 56 28 -13 18 1 136 15 33 -13 16 58 137 45 31 -13 19 28 135 24 40 -13 15 52
135 44 3 -14 28 39 15 3 9 32 70 -55 136 4 55 -14 29 8 135 22 59 -14 28 13 136 55 6 -14 30 25 134 30 47 -14 27 18
134 48 6 -15 40 50 15 3 26 31 70 -54 135 9 32 -15 41 13 134 26 27 -15 40 28 136 1 3 -15 42 20 133 32 44 -15 39 46
133 47 43 -16 54 6 15 3 42 30 70 -53 134 9 50 -16 54 24 133 25 23 -16 53 50 135 2 52 -16 55 18 132 29 54 -16 53 23
132 42 16 -18 8 36 15 3 59 28 70 -52 133 5 9 -18 8 48 132 19 7 -18 8 28 134 0 0 -18 9 27 131 21 31 -18 8 18
131 30 54 -19 24 31 15 4 16 27 70 -51 131 54 43 -19 24 35 131 6 47 -19 24 31 132 51 41 -19 24 56 130 6 38 -19 24 43
130 12 31 -20 42 2 15 4 33 25 70 -50 130 37 28 -20 41 56 129 47 13 -20 42 12 131 37 1 -20 41 55 128 43 57 -20 42 51
128 45 40 -22 1 26 15 4 50 24 70 -48 129 12 2 -22 1 8 128 18 54 -22 1 48 130 14 46 -22 0 40 127 11 42 -22 3 1
127 8 20 -23 23 4 15 5 7 22 70 -47 127 36 30 -23 22 30 126 39 40 -23 23 42 128 43 15 -23 21 28 125 27 21 -23 25 40
125 17 32 -24 47 25 15 5 24 20 71 -45 125 48 5 -24 46 31 124 46 18 -24 48 26 127 0 6 -24 44 43 123 26 59 -24 51 25
123 8 33 -26 15 17 15 5 41 18 71 -44 123 42 28 -26 13 53 122 33 41 -26 16 50 125 1 45 -26 11 2 121 4 4 -26 21 19
120 33 6 -27 47 57 15 5 58 15 72 -42 121 12 15 -27 45 47 119 52 28 -27 50 21 122 42 24 -27 41 20 118 5 41 -27 57 22
117 13 41 -29 28 7 15 6 15 12 73 -39 118 2 23 -29 24 32 116 21 55 -29 32 9 119 51 14 -29 17 20 113 57 56 -29 44 39
112 14 8 -31 24 9 15 6 32 7 76 -36 113 29 58 -31 16 35 110 44 29 -31 33 47 116 2 42 -31 2 54 ... .. .. .. .. ..
Uncertainty in time = +/- 8 secs
Prediction of 2014 Oct 27.0
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[Observing Details]
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