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Updated: 2005 SEP 01, 04:49 UT
Event Rank : 28
(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 2005 Sep 12 UT, the 42 km diameter asteroid (1227) Geranium will occult a 11.5 mag star in the constellation Corona Australis for observers along a path crossing central Queensland and South Australia, the asteroid shadow passing near Adelaide.
In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 14.8 mag (the magnitude of the asteroid) for at most 3.6 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 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
151 48 25 -10 0 0 10 44 53 56 204 -44 152 0 49 151 36 0 153 0 49 150 35 56
151 23 48 -11 0 0 10 44 45 57 204 -43 151 36 15 151 11 21 152 36 28 150 11 3
150 59 2 -12 0 0 10 44 36 58 204 -43 151 11 32 150 46 32 152 11 59 149 45 59
150 34 4 -13 0 0 10 44 27 59 204 -42 150 46 37 150 21 31 151 47 20 149 20 41
150 8 54 -14 0 0 10 44 18 60 205 -42 150 21 31 149 56 17 151 22 31 148 55 10
149 43 30 -15 0 0 10 44 9 61 205 -41 149 56 11 149 30 49 150 57 30 148 29 22
149 17 51 -16 0 0 10 44 0 62 205 -41 149 30 36 149 5 6 150 32 15 148 3 18
148 51 55 -17 0 0 10 43 51 63 205 -40 149 4 44 148 39 5 150 6 45 147 36 54
148 25 41 -18 0 0 10 43 42 65 205 -39 148 38 35 148 12 46 149 41 0 147 10 11
147 59 7 -19 0 0 10 43 32 66 205 -39 148 12 7 147 46 7 149 14 56 146 43 5
147 32 11 -20 0 0 10 43 23 67 205 -38 147 45 17 147 19 5 148 48 34 146 15 36
147 4 53 -21 0 0 10 43 13 68 206 -38 147 18 4 146 51 41 148 21 50 145 47 41
146 37 9 -22 0 0 10 43 3 69 206 -37 146 50 27 146 23 51 147 54 44 145 19 19
146 8 59 -23 0 0 10 42 54 70 206 -36 146 22 24 145 55 33 147 27 14 144 50 27
145 40 20 -24 0 0 10 42 44 71 206 -36 145 53 52 145 26 47 146 59 17 144 21 4
145 11 10 -25 0 0 10 42 34 72 207 -35 145 24 50 144 57 29 146 30 52 143 51 8
144 41 26 -26 0 0 10 42 24 73 207 -34 144 55 15 144 27 37 146 1 56 143 20 35
144 11 7 -27 0 0 10 42 14 74 207 -33 144 25 4 143 57 9 145 32 28 142 49 23
Latitude Latitude Latitude Latitude
143 0 0 -29 15 57 10 41 51 77 208 -32 -29 42 39 -28 49 14 -31 51 48 -26 39 44
142 0 0 -31 5 24 10 41 32 79 209 -30 -31 31 33 -30 39 14 -33 38 2 -28 32 22
141 0 0 -32 50 5 10 41 13 81 209 -29 -33 15 41 -32 24 28 -35 19 28 -30 20 16
140 0 0 -34 30 4 10 40 56 82 210 -28 -34 55 7 -34 5 0 -36 56 13 -32 3 29
139 0 0 -36 5 28 10 40 38 84 212 -26 -36 29 58 -35 40 57 -38 28 25 -33 42 5
138 0 0 -37 36 24 10 40 22 85 213 -25 -38 0 22 -37 12 25 -39 56 12 -35 16 10
137 0 0 -39 3 2 10 40 6 86 217 -24 -39 26 28 -38 39 35 -41 19 45 -36 45 54
136 0 0 -40 25 32 10 39 51 87 248 -23 -40 48 27 -40 2 36 -42 39 13 -38 11 26
135 0 0 -41 44 3 10 39 37 87 22 -22 -42 6 28 -41 21 38 -43 54 48 -39 32 54
134 0 0 -42 58 47 10 39 23 86 28 -21 -43 20 42 -42 36 51 -45 6 41 -40 50 30
133 0 0 -44 9 54 10 39 9 85 30 -20 -44 31 21 -43 48 26 -46 15 3 -42 4 24
132 0 0 -45 17 35 10 38 57 84 32 -19 -45 38 34 -44 56 35 -47 20 3 -43 14 46
131 0 0 -46 21 59 10 38 44 82 33 -18 -46 42 32 -46 1 26 -48 21 53 -44 21 46
130 0 0 -47 23 18 10 38 33 81 34 -17 -47 43 25 -47 3 10 -49 20 43 -45 25 34
129 0 0 -48 21 40 10 38 21 80 35 -16 -48 41 23 -48 1 56 -50 16 42 -46 26 20
128 0 0 -49 17 14 10 38 11 79 36 -15 -49 36 34 -48 57 55 -51 9 59 -47 24 13
127 0 0 -50 10 11 10 38 0 78 37 -14 -50 29 7 -49 51 14 -52 0 43 -48 19 23
126 0 0 -51 0 37 10 37 50 77 38 -13 -51 19 12 -50 42 2 -52 49 2 -49 11 57
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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