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Updated: 2011 JUN 07, 22:51 UT
Event Rank : 72
(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 2011 Jun 16 UT, the 77 km diameter asteroid (779) Nina will occult a 11.9 mag star in the constellation Hydra for observers along a path across Western Australia, travelling parallel to, and just west of, the Western Australia border.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 12.9 mag (the magnitude of the asteroid) for at most 10.1 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
127 24 36 -34 26 24 12 30 17 73 291 -49 126 58 30 -34 25 20 127 50 45 -34 27 23 126 16 21 -34 23 26 128 33 14 -34 28 49
127 21 44 -33 2 35 12 30 37 73 287 -49 126 56 4 -33 1 31 127 47 27 -33 3 34 126 14 36 -32 59 39 128 29 15 -33 4 59
127 19 28 -31 38 55 12 30 57 74 282 -49 126 54 12 -31 37 52 127 44 48 -31 39 53 126 13 22 -31 36 1 128 25 57 -31 41 18
127 17 48 -30 15 22 12 31 18 74 277 -49 126 52 53 -30 14 20 127 42 45 -30 16 20 126 12 38 -30 12 30 128 23 19 -30 17 44
127 16 41 -28 51 53 12 31 38 74 273 -49 126 52 6 -28 50 52 127 41 18 -28 52 50 126 12 25 -28 49 3 128 21 18 -28 54 13
127 16 7 -27 28 25 12 31 58 74 268 -49 126 51 51 -27 27 25 127 40 25 -27 29 21 126 12 40 -27 25 37 128 19 54 -27 30 43
127 16 4 -26 4 54 12 32 19 74 263 -49 126 52 7 -26 3 55 127 40 5 -26 5 50 126 13 23 -26 2 9 128 19 6 -26 7 11
127 16 34 -24 41 19 12 32 39 73 258 -49 126 52 52 -24 40 20 127 40 19 -24 42 13 126 14 35 -24 38 36 128 18 53 -24 43 33
127 17 34 -23 17 35 12 32 59 73 254 -49 126 54 8 -23 16 37 127 41 4 -23 18 28 126 16 15 -23 14 54 128 19 14 -23 19 46
127 19 6 -21 53 39 12 33 19 72 250 -49 126 55 53 -21 52 42 127 42 22 -21 54 32 126 18 23 -21 51 2 128 20 9 -21 55 48
127 21 9 -20 29 29 12 33 40 72 246 -49 126 58 9 -20 28 34 127 44 12 -20 30 21 126 20 59 -20 26 55 128 21 39 -20 31 35
127 23 43 -19 5 1 12 34 0 71 242 -49 127 0 55 -19 4 7 127 46 35 -19 5 52 126 24 3 -19 2 30 128 23 43 -19 7 5
127 26 49 -17 40 13 12 34 20 70 239 -48 127 4 11 -17 39 20 127 49 30 -17 41 2 126 27 37 -17 37 45 128 26 21 -17 42 13
127 30 28 -16 15 0 12 34 41 69 236 -48 127 7 59 -16 14 8 127 52 59 -16 15 47 126 31 40 -16 12 35 128 29 35 -16 16 56
127 34 40 -14 49 18 12 35 1 68 233 -48 127 12 20 -14 48 28 127 57 3 -14 50 4 126 36 15 -14 46 57 128 33 25 -14 51 11
127 39 26 -13 23 5 12 35 21 67 230 -48 127 17 14 -13 22 16 128 1 42 -13 23 50 126 41 21 -13 20 48 128 37 51 -13 24 54
127 44 49 -11 56 16 12 35 42 66 228 -47 127 22 43 -11 55 28 128 6 57 -11 56 59 126 47 1 -11 54 3 128 42 56 -11 58 0
127 50 48 -10 28 46 12 36 2 65 226 -47 127 28 48 -10 28 1 128 12 51 -10 29 28 126 53 15 -10 26 38 128 48 41 -10 30 26
127 57 27 - 9 0 32 12 36 22 64 224 -46 127 35 31 - 8 59 48 128 19 25 - 9 1 12 127 0 6 - 8 58 28 128 55 8 - 9 2 7
128 4 47 - 7 31 29 12 36 42 63 222 -46 127 42 55 - 7 30 47 128 26 42 - 7 32 6 127 7 36 - 7 29 30 129 2 18 - 7 32 58
128 12 51 - 6 1 30 12 37 3 62 220 -45 127 51 1 - 6 0 50 128 34 43 - 6 2 6 127 15 46 - 5 59 37 129 10 15 - 6 2 54
Uncertainty in time = +/- 8 secs
Prediction of 2011 Jun 8.0
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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