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Updated: 2006 FEB 15, 06:36 UT
Event Rank : 78
(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 2006 Mar 01 UT, the 107 km diameter asteroid (181) Eucharis will occult a 11.8 mag star in the constellation Virgo for observers along a fairly low certainty path running up the eastern coast of Australia, from Hobart, past the far eastern end of Victoria, Canberra, Sydney and Brisbane, leaving the continent near Gladstone in Queensland.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 13.1 mag (the magnitude of the asteroid) for at most 10.7 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Ron Stone, 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
147 49 36 -43 38 24 16 53 48 38 24 -28 147 8 51 -43 35 4 148 30 14 -43 41 48 146 11 35 -43 30 31 149 26 58 -43 46 39
148 38 25 -41 28 54 16 54 4 40 24 -29 147 59 9 -41 25 38 149 17 36 -41 32 13 147 4 0 -41 21 9 150 12 18 -41 36 58
149 20 47 -39 24 33 16 54 20 42 23 -30 148 42 47 -39 21 20 149 58 42 -39 27 48 147 49 24 -39 16 56 150 51 40 -39 32 27
149 57 57 -37 24 37 16 54 36 44 23 -31 149 21 2 -37 21 28 150 34 47 -37 27 49 148 29 12 -37 17 9 151 26 15 -37 32 23
150 30 52 -35 28 33 16 54 52 46 23 -32 149 54 54 -35 25 27 151 6 45 -35 31 41 149 4 25 -35 21 11 151 56 54 -35 36 10
151 0 14 -33 35 50 16 55 8 48 23 -33 150 25 7 -33 32 47 151 35 18 -33 38 56 149 35 49 -33 28 35 152 24 17 -33 43 20
151 26 39 -31 46 6 16 55 24 50 23 -34 150 52 16 -31 43 5 152 0 58 -31 49 9 150 4 1 -31 38 57 152 48 55 -31 53 30
151 50 30 -29 59 0 16 55 40 52 24 -35 151 16 47 -29 56 2 152 24 10 -30 2 1 150 29 28 -29 51 56 153 11 13 -30 6 18
152 12 11 -28 14 16 16 55 56 54 24 -35 151 39 3 -28 11 20 152 45 16 -28 17 15 150 52 34 -28 7 17 153 31 30 -28 21 29
152 31 58 -26 31 39 16 56 12 55 24 -36 151 59 21 -26 28 45 153 4 31 -26 34 36 151 13 37 -26 24 44 153 50 1 -26 38 46
152 50 5 -24 50 56 16 56 28 57 25 -37 152 17 56 -24 48 3 153 22 10 -24 53 51 151 32 52 -24 44 5 154 7 1 -24 57 59
153 6 44 -23 11 56 16 56 44 59 25 -37 152 35 1 -23 9 5 153 38 24 -23 14 49 151 50 32 -23 5 9 154 22 39 -23 18 55
153 22 4 -21 34 30 16 57 0 60 26 -38 152 50 44 -21 31 40 153 53 22 -21 37 21 152 6 47 -21 27 46 154 37 5 -21 41 25
153 36 15 -19 58 27 16 57 16 62 26 -38 153 5 15 -19 55 39 154 7 12 -20 1 18 152 21 47 -19 51 46 154 50 28 -20 5 19
153 49 23 -18 23 42 16 57 31 63 27 -39 153 18 42 -18 20 54 154 20 2 -18 26 31 152 35 39 -18 17 3 155 2 52 -18 30 31
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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