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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 the time for your location)
On 2004 Aug 23 UT, the 22 km diameter asteroid (1301) Yvonne will occult a 11.2 mag star in the constellation Hercules for observers along a path across northern and eastern Australia.
In the case of an occultation, the combined light of the asteroid and the star will drop by 6.0 mag to 17.2 mag (the magnitude of the asteroid) for at most 1.2 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
... .. .. -47 0 0 .. .. .. .. .. .. ... .. .. ... .. .. 172 23 59 ... .. ..
173 38 15 -46 0 0 12 25 17 0 290 -55 173 10 36 174 6 35 168 58 8 ... .. ..
170 5 36 -45 0 0 12 25 16 3 292 -56 169 42 34 170 29 1 166 5 33 ... .. ..
167 9 12 -44 0 0 12 25 15 5 294 -57 166 49 3 167 29 37 163 35 49 171 15 56
164 37 4 -43 0 0 12 25 14 8 296 -57 164 18 56 164 55 23 161 23 4 168 14 55
162 22 42 -42 0 0 12 25 12 9 297 -58 162 6 5 162 39 27 159 23 36 165 39 55
160 22 5 -41 0 0 12 25 10 11 299 -58 160 6 40 160 37 37 157 34 55 163 23 37
158 32 33 -40 0 0 12 25 7 13 300 -58 158 18 6 158 47 6 155 55 10 161 21 40
156 52 12 -39 0 0 12 25 5 15 301 -58 156 38 32 157 5 56 154 23 3 159 31 9
155 19 35 -38 0 0 12 25 2 16 302 -58 155 6 36 155 32 38 152 57 28 157 50 3
153 53 38 -37 0 0 12 24 59 18 303 -58 153 41 15 154 6 6 151 37 38 156 16 53
152 33 31 -36 0 0 12 24 56 19 303 -58 152 21 37 152 45 27 150 22 50 154 50 31
151 18 30 -35 0 0 12 24 53 21 304 -58 151 7 3 151 29 59 149 12 33 153 30 2
150 8 2 -34 0 0 12 24 49 22 305 -58 149 56 59 150 19 7 148 6 18 152 14 46
149 1 39 -33 0 0 12 24 46 23 305 -58 148 50 58 149 12 22 147 3 42 151 4 6
147 58 57 -32 0 0 12 24 42 25 306 -58 147 48 35 148 9 20 146 4 25 149 57 33
146 59 35 -31 0 0 12 24 38 26 306 -58 146 49 30 147 9 41 145 8 9 148 54 44
146 3 16 -30 0 0 12 24 34 27 306 -58 145 53 28 146 13 7 144 14 40 147 55 17
145 9 45 -29 0 0 12 24 30 28 307 -57 145 0 11 145 19 21 143 23 44 146 58 55
144 18 49 -28 0 0 12 24 26 30 307 -57 144 9 28 144 28 11 142 35 10 146 5 22
143 30 15 -27 0 0 12 24 22 31 307 -57 143 21 6 143 39 25 141 48 47 145 14 25
142 43 53 -26 0 0 12 24 18 32 307 -57 142 34 55 142 52 52 141 4 27 144 25 51
141 59 34 -25 0 0 12 24 14 33 307 -56 141 50 47 142 8 23 140 22 0 143 39 31
141 17 10 -24 0 0 12 24 9 34 307 -56 141 8 33 141 25 49 139 41 20 142 55 15
140 36 34 -23 0 0 12 24 5 35 307 -56 140 28 5 140 45 4 139 2 19 142 12 54
139 57 38 -22 0 0 12 24 0 36 307 -55 139 49 17 140 5 59 138 24 53 141 32 22
139 20 16 -21 0 0 12 23 55 37 307 -55 139 12 3 139 28 30 137 48 54 140 53 31
138 44 24 -20 0 0 12 23 51 38 307 -54 138 36 18 138 52 30 137 14 19 140 16 15
138 9 55 -19 0 0 12 23 46 40 307 -54 138 1 56 138 17 55 136 41 3 139 40 29
137 36 46 -18 0 0 12 23 41 41 306 -54 137 28 53 137 44 40 136 9 1 139 6 8
137 4 52 -17 0 0 12 23 36 42 306 -53 136 57 4 137 12 40 135 38 9 138 33 7
136 34 9 -16 0 0 12 23 31 43 306 -53 136 26 27 136 41 51 135 8 25 138 1 22
136 4 34 -15 0 0 12 23 26 44 306 -52 135 56 57 136 12 11 134 39 44 137 30 49
135 36 3 -14 0 0 12 23 21 45 305 -52 135 28 31 135 43 36 134 12 5 137 1 24
135 8 34 -13 0 0 12 23 16 45 305 -51 135 1 6 135 16 3 133 45 23 136 33 5
134 42 3 -12 0 0 12 23 10 46 304 -51 134 34 39 134 49 28 133 19 36 136 5 47
134 16 29 -11 0 0 12 23 5 47 304 -50 134 9 9 134 23 50 132 54 42 135 39 30
133 51 48 -10 0 0 12 23 0 48 303 -50 133 44 31 133 59 5 132 30 39 135 14 9
133 27 59 - 9 0 0 12 22 54 49 303 -49 133 20 45 133 35 13 132 7 25 134 49 42
133 4 59 - 8 0 0 12 22 49 50 302 -49 132 57 48 133 12 10 131 44 57 134 26 8
Use these links for further information:
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[Observing Details]
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