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Updated: 2010 APR 15, 17:59 UT
Event Rank : 77
(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 2010 May 06 UT, the 84 km diameter asteroid (680) Genoveva will occult a 11.4 mag star in the constellation Corona Australis for observers along a path across Australia from Townsville across Queensland and South Australia to Streaky Bay.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.8 mag to 13.0 mag (the magnitude of the asteroid) for at most 8.8 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 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
148 21 7 -14 58 8 13 27 7 35 127 -81 148 55 44 -15 17 24 147 46 5 -14 38 24 149 44 14 -15 43 58 146 55 35 -14 9 32
148 2 30 -15 51 13 13 27 17 35 127 -81 148 37 5 -16 10 24 147 27 32 -15 31 35 149 25 32 -16 36 52 146 37 8 -15 2 51
147 42 43 -16 43 32 13 27 28 36 126 -81 148 17 16 -17 2 38 147 7 47 -16 23 57 149 5 42 -17 29 2 146 17 27 -15 55 21
147 21 46 -17 35 5 13 27 38 36 126 -80 147 56 18 -17 54 9 146 46 50 -17 15 34 148 44 45 -18 20 30 145 56 33 -16 47 2
146 59 37 -18 25 55 13 27 48 36 125 -80 147 34 10 -18 44 58 146 24 41 -18 6 26 148 22 39 -19 11 17 145 34 25 -17 37 57
146 36 17 -19 16 2 13 27 58 36 125 -80 147 10 52 -19 35 4 146 1 20 -18 56 33 147 59 24 -20 1 24 145 11 2 -18 28 6
146 11 45 -20 5 27 13 28 9 36 124 -79 146 46 22 -20 24 30 145 36 46 -19 45 58 147 34 58 -20 50 51 144 46 25 -19 17 31
145 45 59 -20 54 12 13 28 19 37 124 -78 146 20 40 -21 13 16 145 10 57 -20 34 41 147 9 22 -21 39 39 144 20 33 -20 6 12
145 18 59 -21 42 15 13 28 29 37 123 -78 145 53 45 -22 1 23 144 43 53 -21 22 42 146 42 34 -22 27 50 143 53 24 -20 54 10
144 50 44 -22 29 39 13 28 39 37 123 -77 145 25 35 -22 48 50 144 15 33 -22 10 2 146 14 32 -23 15 22 143 24 57 -21 41 25
144 21 12 -23 16 22 13 28 49 37 122 -76 144 56 9 -23 35 38 143 45 54 -22 56 41 145 45 15 -24 2 17 142 55 10 -22 27 58
143 50 21 -24 2 26 13 29 0 37 122 -76 144 25 25 -24 21 47 143 14 57 -23 42 39 145 14 41 -24 48 35 142 24 3 -23 13 48
143 18 9 -24 47 50 13 29 10 37 121 -75 143 53 21 -25 7 18 142 42 37 -24 27 57 144 42 49 -25 34 14 141 51 34 -23 58 56
142 44 35 -25 32 34 13 29 20 37 121 -74 143 19 55 -25 52 10 142 8 55 -25 12 33 144 9 35 -26 19 17 141 17 40 -24 43 22
142 9 36 -26 16 38 13 29 30 37 120 -73 142 45 6 -26 36 22 141 33 47 -25 56 28 143 34 59 -27 3 41 140 42 19 -25 27 5
141 33 10 -27 0 1 13 29 41 37 120 -72 142 8 50 -27 19 54 140 57 11 -26 39 42 142 58 57 -27 47 27 140 5 30 -26 10 4
140 55 15 -27 42 42 13 29 51 37 120 -72 141 31 5 -28 2 46 140 19 5 -27 22 12 142 21 28 -28 30 33 139 27 9 -26 52 19
140 15 47 -28 24 42 13 30 1 37 119 -71 140 51 49 -28 44 57 139 39 26 -28 4 0 141 42 28 -29 13 0 138 47 13 -27 33 49
139 34 45 -29 5 58 13 30 11 36 119 -70 140 10 58 -29 26 26 138 58 11 -28 45 3 141 1 54 -29 54 47 138 5 41 -28 14 33
138 52 3 -29 46 29 13 30 22 36 119 -69 139 28 30 -30 7 11 138 15 17 -29 25 20 140 19 43 -30 35 51 137 22 29 -28 54 30
138 7 40 -30 26 15 13 30 32 36 118 -68 138 44 20 -30 47 12 137 30 41 -30 4 51 139 35 53 -31 16 13 136 37 33 -29 33 38
137 21 32 -31 5 14 13 30 42 36 118 -67 137 58 26 -31 26 27 136 44 19 -30 43 33 138 50 19 -31 55 50 135 50 49 -30 11 56
136 33 35 -31 43 23 13 30 52 35 118 -66 137 10 44 -32 4 54 135 56 6 -31 21 25 138 2 57 -32 34 42 135 2 15 -30 49 21
135 43 45 -32 20 42 13 31 2 35 118 -66 136 21 10 -32 42 31 135 6 1 -31 58 24 137 13 44 -33 12 45 134 11 46 -31 25 52
134 51 58 -32 57 7 13 31 13 35 118 -65 135 29 39 -33 19 17 134 13 57 -32 34 28 136 22 36 -33 49 58 133 19 18 -32 1 26
133 58 9 -33 32 36 13 31 23 34 117 -64 134 36 7 -33 55 8 133 19 50 -33 9 35 135 29 28 -34 26 19 132 24 46 -32 35 59
133 2 14 -34 7 7 13 31 33 34 117 -63 133 40 29 -34 30 2 132 23 37 -33 43 41 134 34 15 -35 1 45 131 28 5 -33 9 30
132 4 7 -34 40 35 13 31 43 34 117 -62 132 42 41 -35 3 55 131 25 11 -34 16 44 133 36 52 -35 36 13 130 29 11 -33 41 54
131 3 44 -35 12 58 13 31 54 33 117 -61 131 42 37 -35 36 45 130 24 27 -34 48 39 132 37 15 -36 9 40 129 27 57 -34 13 8
130 0 58 -35 44 11 13 32 4 33 117 -60 130 40 12 -36 8 28 129 21 20 -35 19 22 131 35 17 -36 42 1 128 24 17 -34 43 7
Uncertainty in time = +/- 6 secs
Prediction of 2010 Apr 16.0
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