|
|
Updated: 2009 JUL 16, 01:54 UT
Event Rank : 93
(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 Aug 22 UT, the 116 km diameter asteroid (490) Veritas will occult a 12.8 mag star in the constellation Capricornus for observers along a path beginning over north Queensland passing near Mt Isa, then passing near Alice Springs, and into Western Australia ending between Perth and Albany.
In the case of an occultation, the combined light of the asteroid and the star will drop by 0.8 mag to 12.9 mag (the magnitude of the asteroid) for at most 11.6 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
151 39 1 -16 29 42 18 6 36 2 261 -29 ... .. .. .. .. .. 146 42 34 -16 53 21 ... .. .. .. .. .. 144 1 48 -16 55 7
145 28 14 -18 6 40 18 6 46 9 262 -35 149 6 12 -17 56 48 142 55 1 -18 5 16 ... .. .. .. .. .. 140 56 44 -17 59 29
142 7 37 -19 14 3 18 6 56 12 264 -38 144 30 53 -19 17 22 140 7 25 -19 6 44 147 26 3 -19 13 27 138 27 56 -18 57 31
139 31 47 -20 13 38 18 7 6 14 265 -41 141 28 38 -20 21 44 137 48 17 -20 3 14 143 36 35 -20 26 12 136 19 54 -19 51 55
137 19 45 -21 9 4 18 7 17 16 266 -43 139 2 3 -21 19 53 135 46 40 -20 56 40 140 49 28 -21 28 7 134 25 45 -20 43 54
135 23 4 -22 1 50 18 7 27 18 267 -44 136 55 56 -22 14 29 133 57 12 -21 48 0 138 31 16 -22 24 59 132 41 42 -21 34 8
133 37 18 -22 52 43 18 7 37 20 267 -46 135 3 29 -23 6 42 132 16 47 -22 37 46 136 30 44 -23 18 49 131 5 25 -22 23 1
131 59 50 -23 42 11 18 7 48 21 268 -47 133 20 59 -23 57 14 130 43 25 -23 26 21 134 42 23 -24 10 32 129 35 19 -23 10 51
130 28 54 -24 30 33 18 7 58 23 269 -48 131 46 9 -24 46 28 129 15 46 -24 13 57 133 3 6 -25 0 44 128 10 18 -23 57 50
129 3 18 -25 18 2 18 8 8 24 270 -49 130 17 25 -25 34 42 127 52 50 -25 0 47 131 30 53 -25 49 45 126 49 32 -24 44 8
127 42 8 -26 4 48 18 8 19 25 271 -50 128 53 42 -26 22 6 126 33 52 -25 46 59 130 4 21 -26 37 50 125 32 23 -25 29 50
126 24 44 -26 50 58 18 8 29 26 272 -51 127 34 10 -27 8 51 125 18 19 -26 32 39 128 42 31 -27 25 10 124 18 21 -26 15 3
125 10 34 -27 36 39 18 8 39 27 273 -52 126 18 14 -27 55 2 124 5 43 -27 17 51 127 24 39 -28 11 54 123 7 3 -26 59 51
123 59 13 -28 21 55 18 8 50 28 274 -53 125 5 22 -28 40 46 122 55 41 -28 2 41 126 10 10 -28 58 7 121 58 9 -27 44 18
122 50 20 -29 6 50 18 9 0 29 275 -53 123 55 12 -29 26 7 121 47 57 -28 47 12 124 58 38 -29 43 54 120 51 22 -28 28 27
121 43 39 -29 51 28 18 9 10 30 276 -54 122 47 25 -30 11 10 120 42 14 -29 31 26 123 49 41 -30 29 21 119 46 28 -29 12 22
120 38 54 -30 35 51 18 9 21 31 277 -55 121 41 43 -30 55 56 119 38 19 -30 15 28 122 43 1 -31 14 31 118 43 16 -29 56 4
119 35 54 -31 20 2 18 9 31 31 278 -55 120 37 55 -31 40 29 118 36 2 -30 59 18 121 38 21 -31 59 26 117 41 36 -30 39 35
118 34 27 -32 4 3 18 9 41 32 279 -55 119 35 47 -32 24 52 117 35 13 -31 42 59 120 35 31 -32 44 10 116 41 19 -31 22 58
117 34 26 -32 47 57 18 9 52 33 280 -56 118 35 11 -33 9 6 116 35 43 -32 26 33 119 34 18 -33 28 45 115 42 16 -32 6 15
116 35 41 -33 31 44 18 10 2 34 281 -56 117 35 57 -33 53 14 115 37 26 -33 10 1 118 34 33 -34 13 13 114 44 21 -32 49 26
115 38 7 -34 15 28 18 10 12 34 282 -56 116 37 57 -34 37 17 114 40 13 -33 53 26 117 36 7 -34 57 35 113 47 28 -33 32 33
114 41 35 -34 59 8 18 10 23 35 283 -56 115 41 5 -35 21 17 113 44 0 -34 36 48 116 38 54 -35 41 54 112 51 31 -34 15 38
113 46 1 -35 42 48 18 10 33 35 284 -56 114 45 15 -36 5 16 112 48 41 -35 20 9 115 42 48 -36 26 11 111 56 24 -34 58 42
112 51 20 -36 26 27 18 10 43 36 286 -57 113 50 21 -36 49 14 111 54 11 -36 3 30 114 47 41 -37 10 28 111 2 4 -35 41 47
111 57 26 -37 10 8 18 10 54 36 287 -57 112 56 18 -37 33 14 111 0 25 -36 46 52 113 53 28 -37 54 47 110 8 25 -36 24 52
111 4 15 -37 53 51 18 11 4 37 288 -57 112 3 2 -38 17 16 110 7 20 -37 30 17 113 0 6 -38 39 7 109 15 25 -37 8 0
110 11 44 -38 37 38 18 11 14 37 289 -56 111 10 28 -39 1 22 109 14 51 -38 13 46 112 7 29 -39 23 32 108 22 58 -37 51 12
109 19 48 -39 21 30 18 11 25 37 290 -56 110 18 32 -39 45 33 108 22 55 -38 57 19 111 15 33 -40 8 2 107 31 2 -38 34 28
108 28 24 -40 5 28 18 11 35 38 292 -56 109 27 11 -40 29 51 107 31 28 -39 40 58 110 24 15 -40 52 38 106 39 33 -39 17 50
Uncertainty in time = +/- 6 secs
Prediction of 2009 Jul 16.0
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
[Timing Details]
[Reporting Details]
[Report Form]
[Asteroid Occultation Results]
[Top of Page][Return to Home Page]