|
|
Updated: 2010 MAY 13, 22:35 UT
Event Rank : 39
(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 Jul 05 UT, the 30 km diameter asteroid (340) Eduarda will occult a 12.3 mag star in the constellation Aquarius for observers along a path across eastern Australia, beginning near Bundaberg, running across south-east Queensland, central New South Wales, western Victoria and far southern South Australia, leaving near Mount Gambier.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.4 mag to 14.6 mag (the magnitude of the asteroid) for at most 21.2 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
155 41 30 -18 24 51 14 20 21 46 92 -80 155 53 20 -18 25 58 155 29 38 -18 23 44 156 33 33 -18 29 38 154 48 45 -18 19 49
155 10 30 -19 26 30 14 21 42 45 91 -80 155 22 25 -19 27 37 154 58 32 -19 25 22 156 2 56 -19 31 20 154 17 22 -19 21 24
154 38 9 -20 28 6 14 23 3 45 90 -81 154 50 10 -20 29 14 154 26 6 -20 26 57 155 30 59 -20 33 0 153 44 36 -20 22 55
154 4 24 -21 29 40 14 24 23 45 89 -81 154 16 31 -21 30 49 153 52 14 -21 28 30 154 57 41 -21 34 39 153 10 23 -21 24 25
153 29 11 -22 31 14 14 25 44 45 88 -82 153 41 25 -22 32 24 153 16 55 -22 30 3 154 22 58 -22 36 18 152 34 40 -22 25 53
152 52 28 -23 32 48 14 27 5 44 88 -82 153 4 49 -23 33 59 152 40 4 -23 31 35 153 46 46 -23 37 57 151 57 24 -23 27 21
152 14 8 -24 34 22 14 28 26 44 87 -82 152 26 37 -24 35 35 152 1 37 -24 33 8 153 9 2 -24 39 38 151 18 29 -24 28 49
151 34 9 -25 35 58 14 29 46 44 86 -82 151 46 47 -25 37 13 151 21 29 -25 34 43 152 29 40 -25 41 22 150 37 52 -25 30 18
150 52 24 -26 37 37 14 31 7 43 85 -82 151 5 11 -26 38 53 150 39 35 -26 36 20 151 48 36 -26 43 8 149 55 25 -26 31 48
150 8 47 -27 39 18 14 32 28 43 84 -82 150 21 44 -27 40 36 149 55 48 -27 37 59 151 5 43 -27 44 57 149 11 3 -27 33 20
149 23 12 -28 41 3 14 33 48 42 84 -81 149 36 20 -28 42 23 149 10 2 -28 39 41 150 20 55 -28 46 51 148 24 39 -28 34 55
148 35 30 -29 42 51 14 35 9 42 83 -81 148 48 50 -29 44 14 148 22 8 -29 41 27 149 34 4 -29 48 50 147 36 4 -29 36 32
147 45 34 -30 44 43 14 36 30 41 82 -80 147 59 6 -30 46 9 147 31 59 -30 43 17 148 45 3 -30 50 53 146 45 11 -30 38 13
146 53 13 -31 46 40 14 37 51 41 82 -80 147 6 59 -31 48 8 146 39 25 -31 45 10 147 53 42 -31 53 2 145 51 49 -31 39 56
145 58 17 -32 48 40 14 39 11 40 81 -79 146 12 18 -32 50 12 145 44 14 -32 47 8 146 59 51 -32 55 16 144 55 46 -32 41 43
145 0 34 -33 50 45 14 40 32 39 81 -78 145 14 50 -33 52 20 144 46 14 -33 49 9 146 3 17 -33 57 36 143 56 50 -33 43 32
143 59 49 -34 52 54 14 41 53 39 80 -77 144 14 23 -34 54 33 143 45 12 -34 51 14 145 3 48 -35 0 2 142 54 46 -34 45 23
142 55 47 -35 55 6 14 43 13 38 80 -77 143 10 40 -35 56 49 142 40 50 -35 53 22 144 1 9 -36 2 32 141 49 18 -35 47 16
141 48 9 -36 57 21 14 44 34 37 80 -76 142 3 23 -36 59 8 141 32 52 -36 55 32 142 55 1 -37 5 6 140 40 8 -36 49 9
140 36 36 -37 59 36 14 45 55 36 80 -75 140 52 12 -38 1 29 140 20 56 -37 57 42 141 45 6 -38 7 44 139 26 53 -37 51 1
139 20 44 -39 1 50 14 47 16 35 80 -74 139 36 45 -39 3 49 139 4 39 -38 59 50 140 31 0 -39 10 23 138 9 8 -38 52 49
138 0 5 -40 4 1 14 48 36 34 80 -73 138 16 32 -40 6 6 137 43 33 -40 1 55 139 12 19 -40 13 2 136 46 26 -39 54 30
Uncertainty in time = +/- 36 secs
Prediction of 2010 May 14.0
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]