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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 14 UT, the 97 km diameter asteroid (148) Gallia will occult a 10.1 mag star in the constellation Aquarius for observers along a path across SE Australia.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 11.1 mag (the magnitude of the asteroid) for at most 6.6 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Ron Stone, 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
177 17 45 - 3 0 0 16 57 48 7 260 -20 175 18 33 179 34 2 174 10 49 -178 48 32
174 38 40 - 4 0 0 16 57 53 10 260 -22 172 54 29 176 33 27 171 54 3 177 51 42
172 21 38 - 5 0 0 16 57 58 12 261 -25 170 47 32 174 3 11 169 52 14 175 10 49
170 19 57 - 6 0 0 16 58 5 15 261 -27 168 53 8 171 52 22 168 1 42 172 53 4
168 29 45 - 7 0 0 16 58 11 16 261 -29 167 8 31 169 55 26 166 20 5 170 51 11
166 48 36 - 8 0 0 16 58 18 18 262 -31 165 31 47 168 9 5 164 45 46 169 1 6
165 14 51 - 9 0 0 16 58 25 20 262 -32 164 1 37 166 31 11 163 17 35 167 20 16
163 47 17 -10 0 0 16 58 32 21 263 -34 162 37 1 165 0 14 161 54 39 165 46 57
162 25 2 -11 0 0 16 58 40 23 263 -35 161 17 15 163 35 9 160 36 17 164 19 56
161 7 23 -12 0 0 16 58 48 24 264 -37 160 1 42 162 15 8 159 21 57 162 58 17
159 53 47 -13 0 0 16 58 55 25 265 -38 158 49 55 160 59 31 158 11 12 161 41 18
158 43 49 -14 0 0 16 59 3 27 265 -39 157 41 31 159 47 49 157 3 40 160 28 25
157 37 6 -15 0 0 16 59 11 28 266 -40 156 36 9 158 39 36 155 59 5 159 19 12
156 33 20 -16 0 0 16 59 19 29 267 -42 155 33 34 157 34 33 154 57 11 158 13 17
155 32 17 -17 0 0 16 59 27 30 268 -43 154 33 32 156 32 22 153 57 44 157 10 21
154 33 43 -18 0 0 16 59 35 31 268 -44 153 35 51 155 32 50 153 0 34 156 10 9
153 37 27 -19 0 0 16 59 43 32 269 -44 152 40 22 154 35 43 152 5 32 155 12 29
152 43 20 -20 0 0 16 59 51 32 270 -45 151 46 55 153 40 52 151 12 28 154 17 8
151 51 14 -21 0 0 17 0 0 33 271 -46 150 55 24 152 48 8 150 21 16 153 23 59
151 1 1 -22 0 0 17 0 8 34 272 -47 150 5 40 151 57 23 149 31 50 152 32 52
150 12 35 -23 0 0 17 0 16 35 273 -47 149 17 39 151 8 30 148 44 3 151 43 40
149 25 51 -24 0 0 17 0 25 35 274 -48 148 31 15 150 21 22 147 57 51 150 56 18
148 40 43 -25 0 0 17 0 33 36 275 -49 147 46 24 149 35 56 147 13 9 150 10 39
147 57 8 -26 0 0 17 0 41 36 276 -49 147 3 2 148 52 7 146 29 54 149 26 39
147 15 2 -27 0 0 17 0 49 37 277 -49 146 21 5 148 9 49 145 48 2 148 44 15
146 34 21 -28 0 0 17 0 58 37 278 -50 145 40 30 147 29 1 145 7 30 148 3 21
145 55 2 -29 0 0 17 1 6 38 280 -50 145 1 14 146 49 39 144 28 15 147 23 56
145 17 4 -30 0 0 17 1 14 38 281 -50 144 23 15 146 11 40 143 50 16 146 45 56
144 40 24 -31 0 0 17 1 22 38 282 -51 143 46 32 145 35 2 143 13 30 146 9 19
144 5 0 -32 0 0 17 1 31 38 283 -51 143 11 1 144 59 44 142 37 55 145 34 4
143 30 50 -33 0 0 17 1 39 39 284 -51 142 36 43 144 25 43 142 3 30 145 0 8
142 57 54 -34 0 0 17 1 47 39 285 -51 142 3 35 143 52 59 141 30 15 144 27 31
142 26 11 -35 0 0 17 1 55 39 286 -51 141 31 36 143 21 30 140 58 7 143 56 11
141 55 40 -36 0 0 17 2 3 39 288 -51 141 0 47 142 51 16 140 27 6 143 26 8
141 26 20 -37 0 0 17 2 11 39 289 -51 140 31 6 142 22 17 139 57 13 142 57 21
140 58 11 -38 0 0 17 2 19 39 290 -51 140 2 34 141 54 32 139 28 26 142 29 51
140 31 14 -39 0 0 17 2 27 39 291 -50 139 35 10 141 28 1 139 0 46 142 3 37
140 5 29 -40 0 0 17 2 35 39 292 -50 139 8 56 141 2 46 138 34 13 141 38 41
139 40 57 -41 0 0 17 2 43 39 293 -50 138 43 50 140 38 47 138 8 47 141 15 2
139 17 38 -42 0 0 17 2 51 39 294 -50 138 19 55 140 16 5 137 44 30 140 52 43
138 55 34 -43 0 0 17 2 58 38 295 -49 137 57 12 139 54 41 137 21 22 140 31 44
138 34 47 -44 0 0 17 3 6 38 296 -49 137 35 41 139 34 38 136 59 25 140 12 8
138 15 18 -45 0 0 17 3 13 38 297 -48 137 15 25 139 15 56 136 38 40 139 53 57
137 57 10 -46 0 0 17 3 21 38 298 -48 136 56 26 138 58 40 136 19 10 139 37 13
137 40 25 -47 0 0 17 3 28 37 299 -47 136 38 47 138 42 51 136 0 57 139 22 0
137 25 7 -48 0 0 17 3 36 37 300 -47 136 22 29 138 28 34 135 44 3 139 8 21
137 11 19 -49 0 0 17 3 43 37 301 -46 136 7 37 138 15 52 135 28 31 138 56 20
136 59 6 -50 0 0 17 3 50 36 301 -46 135 54 14 138 4 50 135 14 26 138 46 3
136 48 32 -51 0 0 17 3 57 36 302 -45 135 42 26 137 55 33 135 1 52 138 37 34
136 39 43 -52 0 0 17 4 4 35 303 -45 135 32 16 137 48 7 134 50 53 138 31 1
136 32 46 -53 0 0 17 4 11 35 304 -44 135 23 51 137 42 38 134 41 35 138 26 29
136 27 46 -54 0 0 17 4 18 34 304 -43 135 17 17 137 39 16 134 34 4 138 24 8
136 24 54 -55 0 0 17 4 24 34 305 -42 135 12 43 137 38 8 134 28 28 138 24 8
136 24 17 -56 0 0 17 4 31 33 305 -42 135 10 16 137 39 26 134 24 54 138 26 37
136 26 8 -57 0 0 17 4 38 32 306 -41 135 10 6 137 43 20 134 23 32 138 31 51
136 30 37 -58 0 0 17 4 44 32 306 -40 135 12 26 137 50 5 134 24 32 138 40 1
136 38 1 -59 0 0 17 4 50 31 307 -39 135 17 28 137 59 56 134 28 9 138 51 26
136 48 36 -60 0 0 17 4 56 30 307 -39 135 25 27 138 13 11 134 34 35 139 6 25
137 2 40 -61 0 0 17 5 2 30 307 -38 135 36 42 138 30 13 134 44 7 139 25 21
137 20 38 -62 0 0 17 5 8 29 307 -37 135 51 33 138 51 26 134 57 6 139 48 39
137 42 56 -63 0 0 17 5 14 28 307 -36 136 10 24 139 17 20 135 13 54 140 16 53
138 10 6 -64 0 0 17 5 20 27 307 -35 136 33 45 139 48 31 135 34 58 140 50 40
138 42 46 -65 0 0 17 5 26 27 307 -34 137 2 10 140 25 41 136 0 51 141 30 45
Latitude Latitude Latitude Latitude
139 0 0 -65 27 49 17 5 28 26 307 -34 -67 53 36 -62 21 9 -69 12 26 -59 36 5
140 0 0 -66 50 24 17 5 36 25 306 -32 -68 57 10 -64 19 40 -70 7 51 -62 25 28
141 0 0 -67 57 26 17 5 42 24 306 -31 -69 51 4 -65 47 36 -70 55 39 -64 14 54
142 0 0 -68 53 57 17 5 47 23 305 -30 -70 37 47 -66 58 13 -71 37 36 -65 38 13
143 0 0 -69 42 46 17 5 51 23 304 -29 -71 18 56 -67 57 22 -72 14 54 -66 45 59
144 0 0 -70 25 38 17 5 54 22 303 -29 -71 55 37 -68 48 16 -72 48 22 -67 43 12
145 0 0 -71 3 47 17 5 58 21 303 -28 -72 28 37 -69 32 50 -73 18 39 -68 32 42
146 0 0 -71 38 4 17 6 0 21 302 -27 -72 58 32 -70 12 25 -73 46 14 -69 16 13
147 0 0 -72 9 6 17 6 3 20 301 -27 -73 25 50 -70 47 56 -74 11 30 -69 54 59
148 0 0 -72 37 22 17 6 5 20 300 -26 -73 50 51 -71 20 2 -74 34 43 -70 29 50
149 0 0 -73 3 17 17 6 7 19 299 -26 -74 13 53 -71 49 16 -74 56 10 -71 1 25
150 0 0 -73 27 7 17 6 9 19 298 -25 -74 35 10 -72 16 1 -75 16 1 -71 30 13
151 0 0 -73 49 7 17 6 11 18 297 -25 -74 54 54 -72 40 37 -75 34 28 -71 56 36
152 0 0 -74 9 31 17 6 13 18 296 -24 -75 13 15 -73 3 19 -75 51 39 -72 20 54
153 0 0 -74 28 27 17 6 14 17 296 -24 -75 30 20 -73 24 20 -76 7 40 -72 43 20
154 0 0 -74 46 6 17 6 16 17 295 -24 -75 46 17 -73 43 51 -76 22 39 -73 4 7
155 0 0 -75 2 33 17 6 17 17 294 -23 -76 1 12 -74 2 0 -76 36 41 -73 23 25
156 0 0 -75 17 56 17 6 18 16 293 -23 -76 15 10 -74 18 56 -76 49 50 -73 41 24
157 0 0 -75 32 20 17 6 19 16 292 -23 -76 28 16 -74 34 46 -77 2 11 -73 58 10
158 0 0 -75 45 49 17 6 20 16 291 -22 -76 40 34 -74 49 33 -77 13 47 -74 13 50
159 0 0 -75 58 29 17 6 22 15 290 -22 -76 52 7 -75 3 25 -77 24 42 -74 28 30
160 0 0 -76 10 22 17 6 23 15 289 -22 -77 2 59 -75 16 25 -77 34 58 -74 42 14
161 0 0 -76 21 32 17 6 23 15 288 -21 -77 13 12 -75 28 36 -77 44 37 -74 55 6
162 0 0 -76 32 2 17 6 24 15 287 -21 -77 22 49 -75 40 3 -77 53 43 -75 7 10
163 0 0 -76 41 55 17 6 25 14 286 -21 -77 31 52 -75 50 49 -78 2 18 -75 18 31
164 0 0 -76 51 12 17 6 26 14 285 -20 -77 40 23 -76 0 55 -78 10 22 -75 29 9
165 0 0 -76 59 56 17 6 27 14 284 -20 -77 48 25 -76 10 25 -78 17 58 -75 39 9
166 0 0 -77 8 9 17 6 28 14 283 -20 -77 55 57 -76 19 20 -78 25 8 -75 48 32
167 0 0 -77 15 52 17 6 28 13 282 -20 -78 3 4 -76 27 43 -78 31 52 -75 57 20
168 0 0 -77 23 7 17 6 29 13 281 -19 -78 9 44 -76 35 34 -78 38 12 -76 5 36
169 0 0 -77 29 56 17 6 30 13 280 -19 -78 16 0 -76 42 57 -78 44 9 -76 13 21
170 0 0 -77 36 19 17 6 30 13 279 -19 -78 21 53 -76 49 52 -78 49 44 -76 20 37
171 0 0 -77 42 17 17 6 31 12 278 -19 -78 27 24 -76 56 21 -78 54 58 -76 27 25
172 0 0 -77 47 53 17 6 32 12 278 -18 -78 32 34 -77 2 24 -78 59 53 -76 33 46
173 0 0 -77 53 7 17 6 32 12 277 -18 -78 37 23 -77 8 3 -79 4 27 -76 39 42
174 0 0 -77 57 58 17 6 33 12 276 -18 -78 41 52 -77 13 19 -79 8 43 -76 45 13
175 0 0 -78 2 30 17 6 33 12 275 -18 -78 46 3 -77 18 12 -79 12 42 -76 50 20
176 0 0 -78 6 41 17 6 34 11 274 -18 -78 49 55 -77 22 44 -79 16 22 -76 55 5
177 0 0 -78 10 33 17 6 34 11 273 -17 -78 53 30 -77 26 54 -79 19 46 -76 59 28
178 0 0 -78 14 7 17 6 35 11 272 -17 -78 56 47 -77 30 45 -79 22 54 -77 3 29
179 0 0 -78 17 22 17 6 35 11 271 -17 -78 59 47 -77 34 16 -79 25 46 -77 7 10
180 0 0 -78 20 20 17 6 36 10 270 -17 -79 2 32 -77 37 27 -79 28 22 -77 10 31
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