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Updated: 2009 DEC 27, 13:41 UT
Event Rank : 90
(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 Jan 29 UT, the 67 km diameter asteroid (442) Eichsfeldia will occult a 11.6 mag star in the constellation Orion for observers along a path across Queensland during evening twilight.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.7 mag (the magnitude of the asteroid) for at most 9.6 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 Limits Error Limits
E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' "
Longitude Longitude Longitude Longitude
178 7 20 -34 0 0 9 28 57 37 5 -24 179 5 10 177 8 44 -179 54 19 176 5 42
176 22 10 -33 0 0 9 29 22 38 7 -24 177 20 45 175 22 43 178 22 0 174 18 44
174 34 0 -32 0 0 9 29 48 39 9 -23 175 33 31 173 33 33 176 35 39 172 28 25
172 42 27 -31 0 0 9 30 16 39 11 -23 173 43 4 171 40 49 174 46 17 170 34 18
170 47 4 -30 0 0 9 30 44 40 14 -22 171 49 0 169 44 0 172 53 31 168 35 50
168 47 18 -29 0 0 9 31 14 41 16 -22 169 50 49 167 42 31 170 56 51 166 32 21
166 42 28 -28 0 0 9 31 45 41 19 -21 167 47 53 165 35 38 168 55 45 164 23 4
165 0 0 -27 12 43 9 32 11 41 21 -20 -26 42 8 -27 43 39 -26 10 5 -28 16 51
164 0 0 -26 45 52 9 32 26 41 22 -20 -26 15 28 -27 16 37 -25 43 36 -27 49 36
163 0 0 -26 19 39 9 32 41 42 23 -19 -25 49 25 -26 50 13 -25 17 43 -27 23 0
162 0 0 -25 54 3 9 32 56 42 25 -19 -25 23 59 -26 24 27 -24 52 28 -26 57 3
161 0 0 -25 29 5 9 33 11 42 26 -18 -24 59 11 -25 59 19 -24 27 50 -26 31 44
160 0 0 -25 4 46 9 33 26 42 27 -18 -24 35 1 -25 34 50 -24 3 50 -26 7 4
159 0 0 -24 41 4 9 33 41 42 28 -17 -24 11 29 -25 10 59 -23 40 27 -25 43 3
158 0 0 -24 18 2 9 33 56 41 29 -17 -23 48 35 -24 47 47 -23 17 42 -25 19 41
157 0 0 -23 55 38 9 34 11 41 31 -16 -23 26 20 -24 25 15 -22 55 36 -24 56 59
156 0 0 -23 33 53 9 34 26 41 32 -15 -23 4 44 -24 3 21 -22 34 8 -24 34 56
155 0 0 -23 12 48 9 34 41 41 33 -15 -22 43 46 -23 42 8 -22 13 18 -24 13 33
154 0 0 -22 52 22 9 34 55 41 34 -14 -22 23 27 -23 21 34 -21 53 7 -23 52 51
153 0 0 -22 32 35 9 35 10 41 35 -14 -22 3 48 -23 1 39 -21 33 35 -23 32 48
152 0 0 -22 13 27 9 35 24 40 36 -13 -21 44 47 -22 42 25 -21 14 42 -23 13 25
151 0 0 -21 55 0 9 35 39 40 38 -12 -21 26 27 -22 23 50 -20 56 28 -22 54 43
150 0 0 -21 37 12 9 35 53 40 39 -12 -21 8 45 -22 5 56 -20 38 54 -22 36 42
149 0 0 -21 20 4 9 36 7 39 40 -11 -20 51 43 -21 48 41 -20 21 58 -22 19 20
148 0 0 -21 3 36 9 36 21 39 41 -10 -20 35 22 -21 32 7 -20 5 42 -22 2 40
147 0 0 -20 47 49 9 36 35 39 42 -9 -20 19 39 -21 16 14 -19 50 6 -21 46 40
146 0 0 -20 32 41 9 36 49 38 43 -9 -20 4 37 -21 1 1 -19 35 9 -21 31 21
145 0 0 -20 18 14 9 37 2 38 44 -8 -19 50 15 -20 46 29 -19 20 52 -21 16 43
144 0 0 -20 4 27 9 37 16 37 45 -7 -19 36 33 -20 32 37 -19 7 15 -21 2 46
143 0 0 -19 51 21 9 37 29 37 45 -7 -19 23 32 -20 19 27 -18 54 18 -20 49 31
142 0 0 -19 38 56 9 37 42 36 46 -6 -19 11 10 -20 6 57 -18 42 1 -20 36 56
141 0 0 -19 27 11 9 37 55 36 47 -5 -18 59 29 -19 55 8 -18 30 24 -20 25 3
Uncertainty in time = +/- 7 secs
Prediction of 2009 Dec 27.0
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