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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 Jul 27 UT, the 29 km diameter asteroid (706) Hirundo will occult a 10.7 mag star in the constellation Scorpius for observers along a path across New Zealand, Australia, SE Asia.
In the case of an occultation, the combined light of the asteroid and the star will drop by 4.3 mag to 15.0 mag (the magnitude of the asteroid) for at most 3.7 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 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
... .. .. 45 0 0 .. .. .. .. .. .. ... .. .. ... .. .. ... .. .. 118 17 39
119 36 0 44 0 0 15 3 48 1 208 -25 119 52 22 119 19 43 121 39 24 117 36 58
118 55 14 43 0 0 15 3 48 2 207 -26 119 11 8 118 39 25 120 55 4 116 59 27
118 17 39 42 0 0 15 3 47 3 207 -27 118 33 8 118 2 14 120 14 13 116 24 49
117 42 58 41 0 0 15 3 46 4 206 -28 117 58 4 117 27 56 119 36 34 115 52 52
117 11 0 40 0 0 15 3 44 5 206 -29 117 25 44 116 56 19 119 1 52 115 23 24
116 41 32 39 0 0 15 3 42 6 206 -29 116 55 57 116 27 10 118 29 53 114 56 15
116 14 24 38 0 0 15 3 40 7 205 -30 116 28 31 116 0 21 118 0 27 114 31 16
115 49 28 37 0 0 15 3 38 8 205 -31 116 3 18 115 35 41 117 33 22 114 8 19
115 26 35 36 0 0 15 3 35 9 205 -32 115 40 9 115 13 3 117 8 30 113 47 16
115 5 37 35 0 0 15 3 31 10 205 -33 115 18 57 114 52 19 116 45 42 113 28 1
114 46 29 34 0 0 15 3 28 11 205 -33 114 59 35 114 33 24 116 24 51 113 10 29
114 29 4 33 0 0 15 3 24 12 204 -34 114 41 58 114 16 12 116 5 51 112 54 33
114 13 17 32 0 0 15 3 20 13 204 -35 114 26 0 114 0 36 115 48 36 112 40 9
113 59 3 31 0 0 15 3 15 14 204 -36 114 11 35 113 46 34 115 33 0 112 27 14
113 46 19 30 0 0 15 3 10 15 204 -37 113 58 41 113 33 59 115 18 59 112 15 41
113 35 0 29 0 0 15 3 5 16 204 -37 113 47 12 113 22 49 115 6 28 112 5 30
113 25 2 28 0 0 15 3 0 17 204 -38 113 37 6 113 13 0 114 55 24 111 56 35
113 16 23 27 0 0 15 2 54 18 204 -39 113 28 19 113 4 29 114 45 43 111 48 54
113 8 59 26 0 0 15 2 48 19 204 -40 113 20 47 112 57 13 114 37 22 111 42 25
113 2 49 25 0 0 15 2 42 20 204 -41 113 14 30 112 51 9 114 30 18 111 37 5
112 57 48 24 0 0 15 2 35 21 204 -42 113 9 23 112 46 16 114 24 29 111 32 51
112 53 56 23 0 0 15 2 28 22 204 -42 113 5 25 112 42 30 114 19 52 111 29 43
112 51 11 22 0 0 15 2 21 23 204 -43 113 2 34 112 39 50 114 16 24 111 27 38
112 49 30 21 0 0 15 2 14 24 205 -44 113 0 48 112 38 14 114 14 5 111 26 34
112 48 53 20 0 0 15 2 6 25 205 -45 113 0 6 112 37 41 114 12 52 111 26 30
112 49 17 19 0 0 15 1 58 26 205 -46 113 0 26 112 38 9 114 12 44 111 27 25
112 50 41 18 0 0 15 1 50 27 205 -47 113 1 47 112 39 38 114 13 39 111 29 18
112 53 5 17 0 0 15 1 41 28 205 -47 113 4 7 112 42 5 114 15 37 111 32 7
112 56 28 16 0 0 15 1 33 28 206 -48 113 7 27 112 45 31 114 18 36 111 35 52
113 0 48 15 0 0 15 1 24 29 206 -49 113 11 44 112 49 54 114 22 36 111 40 32
113 6 6 14 0 0 15 1 14 30 206 -50 113 16 59 112 55 14 114 27 36 111 46 7
113 12 20 13 0 0 15 1 5 31 206 -51 113 23 11 113 1 30 114 33 34 111 52 36
113 19 30 12 0 0 15 0 55 32 207 -52 113 30 19 113 8 41 114 40 32 111 59 58
113 27 35 11 0 0 15 0 45 33 207 -52 113 38 24 113 16 49 114 48 28 112 8 14
113 36 37 10 0 0 15 0 35 34 208 -53 113 47 24 113 25 51 114 57 22 112 17 23
113 46 34 9 0 0 15 0 24 34 208 -54 113 57 21 113 35 49 115 7 14 112 27 25
113 57 27 8 0 0 15 0 14 35 208 -55 114 8 13 113 46 42 115 18 4 112 38 20
114 9 15 7 0 0 15 0 3 36 209 -56 114 20 2 113 58 30 115 29 53 112 50 9
114 22 0 6 0 0 14 59 52 37 209 -57 114 32 47 114 11 15 115 42 41 113 2 51
114 35 41 5 0 0 14 59 40 38 210 -58 114 46 29 114 24 55 115 56 28 113 16 27
114 50 19 4 0 0 14 59 28 38 210 -58 115 1 8 114 39 32 116 11 14 113 30 58
115 5 55 3 0 0 14 59 16 39 211 -59 115 16 45 114 55 7 116 27 1 113 46 24
115 22 30 2 0 0 14 59 4 40 212 -60 115 33 22 115 11 40 116 43 49 114 2 46
115 40 4 1 0 0 14 58 52 41 212 -61 115 50 58 115 29 11 117 1 40 114 20 5
115 58 38 0 0 0 14 58 39 41 213 -62 116 9 35 115 47 43 117 20 34 114 38 21
116 18 14 - 1 0 0 14 58 27 42 213 -63 116 29 14 116 7 17 117 40 32 114 57 37
116 38 54 - 2 0 0 14 58 13 43 214 -64 116 49 56 116 27 53 118 1 37 115 17 53
117 0 37 - 3 0 0 14 58 0 43 215 -65 117 11 44 116 49 33 118 23 50 115 39 10
117 23 28 - 4 0 0 14 57 47 44 216 -65 117 34 39 117 12 19 118 47 13 116 1 30
117 47 26 - 5 0 0 14 57 33 45 217 -66 117 58 42 117 36 13 119 11 47 116 24 56
118 12 35 - 6 0 0 14 57 19 45 217 -67 118 23 56 118 1 17 119 37 36 116 49 28
118 38 57 - 7 0 0 14 57 5 46 218 -68 118 50 23 118 27 33 120 4 41 117 15 10
119 6 34 - 8 0 0 14 56 50 46 219 -69 119 18 7 118 55 4 120 33 6 117 42 3
119 35 29 - 9 0 0 14 56 36 47 220 -70 119 47 9 119 23 52 121 2 54 118 10 10
120 5 46 -10 0 0 14 56 21 47 221 -71 120 17 33 119 54 2 121 34 8 118 39 34
Latitude Latitude Latitude Latitude
121 0 0 -11 41 4 14 55 55 48 223 -72 -11 19 26 -12 2 27 - 8 54 17 -14 14 42
122 0 0 -13 24 30 14 55 29 48 225 -74 -13 4 4 -13 44 44 -10 47 39 -15 50 19
123 0 0 -15 0 20 14 55 3 49 226 -75 -14 40 55 -15 19 35 -12 31 47 -17 19 28
124 0 0 -16 29 32 14 54 39 49 228 -76 -16 10 59 -16 47 56 -14 8 1 -18 42 50
125 0 0 -17 52 51 14 54 16 50 230 -77 -17 35 3 -18 10 31 -15 37 26 -20 1 3
126 0 0 -19 10 54 14 53 53 50 231 -78 -18 53 46 -19 27 55 -17 0 48 -21 14 34
127 0 0 -20 24 12 14 53 32 50 233 -79 -20 7 40 -20 40 39 -18 18 48 -22 23 50
128 0 0 -21 33 11 14 53 12 50 234 -80 -21 17 11 -21 49 6 -19 31 59 -23 29 10
129 0 0 -22 38 13 14 52 52 50 235 -80 -22 22 41 -22 53 40 -20 40 45 -24 30 54
130 0 0 -23 39 36 14 52 33 50 237 -81 -23 24 29 -23 54 37 -21 45 32 -25 29 17
131 0 0 -24 37 36 14 52 15 49 238 -81 -24 22 54 -24 52 15 -22 46 37 -26 24 33
132 0 0 -25 32 29 14 51 57 49 239 -81 -25 18 8 -25 46 46 -23 44 18 -27 16 56
133 0 0 -26 24 27 14 51 40 49 240 -81 -26 10 25 -26 38 24 -24 38 49 -28 6 34
134 0 0 -27 13 40 14 51 24 49 240 -81 -26 59 57 -27 27 20 -25 30 24 -28 53 40
135 0 0 -28 0 20 14 51 8 48 241 -80 -27 46 53 -28 13 43 -26 19 13 -29 38 21
136 0 0 -28 44 34 14 50 52 48 242 -80 -28 31 23 -28 57 41 -27 5 28 -30 20 45
137 0 0 -29 26 31 14 50 37 47 243 -79 -29 13 35 -29 39 24 -27 49 16 -31 1 1
138 0 0 -30 6 19 14 50 23 47 243 -79 -29 53 36 -30 18 59 -28 30 47 -31 39 13
139 0 0 -30 44 3 14 50 9 47 244 -78 -30 31 32 -30 56 31 -29 10 7 -32 15 30
140 0 0 -31 19 50 14 49 55 46 244 -78 -31 7 31 -31 32 6 -29 47 23 -32 49 54
141 0 0 -31 53 46 14 49 42 46 245 -77 -31 41 38 -32 5 51 -30 22 42 -33 22 33
142 0 0 -32 25 55 14 49 29 45 245 -76 -32 13 57 -32 37 50 -30 56 8 -33 53 31
143 0 0 -32 56 22 14 49 17 45 245 -76 -32 44 33 -33 8 8 -31 27 47 -34 22 51
144 0 0 -33 25 11 14 49 5 44 245 -75 -33 13 31 -33 36 49 -31 57 43 -34 50 37
145 0 0 -33 52 26 14 48 53 44 246 -74 -33 40 54 -34 3 56 -32 26 1 -35 16 54
146 0 0 -34 18 11 14 48 41 43 246 -74 -34 6 47 -34 29 33 -32 52 44 -35 41 44
147 0 0 -34 42 29 14 48 30 42 246 -73 -34 31 12 -34 53 44 -33 17 56 -36 5 11
148 0 0 -35 5 22 14 48 19 42 246 -72 -34 54 12 -35 16 31 -33 41 40 -36 27 17
149 0 0 -35 26 54 14 48 8 41 246 -72 -35 15 50 -35 37 57 -34 3 59 -36 48 5
150 0 0 -35 47 8 14 47 58 41 246 -71 -35 36 9 -35 58 4 -34 24 56 -37 7 37
151 0 0 -36 6 5 14 47 48 40 246 -70 -35 55 11 -36 16 56 -34 44 33 -37 25 56
152 0 0 -36 23 47 14 47 38 40 246 -70 -36 12 59 -36 34 33 -35 2 53 -37 43 3
153 0 0 -36 40 17 14 47 28 39 246 -69 -36 29 33 -36 50 59 -35 19 57 -37 59 1
154 0 0 -36 55 36 14 47 18 38 246 -68 -36 44 57 -37 6 14 -35 35 48 -38 13 50
155 0 0 -37 9 47 14 47 9 38 245 -68 -36 59 11 -37 20 21 -35 50 28 -38 27 33
156 0 0 -37 22 49 14 47 0 37 245 -67 -37 12 17 -37 33 20 -36 3 57 -38 40 11
157 0 0 -37 34 46 14 46 51 37 245 -66 -37 24 17 -37 45 13 -36 16 17 -38 51 45
158 0 0 -37 45 38 14 46 42 36 245 -66 -37 35 11 -37 56 2 -36 27 30 -39 2 16
159 0 0 -37 55 25 14 46 34 35 245 -65 -37 45 1 -38 5 47 -36 37 37 -39 11 45
160 0 0 -38 4 10 14 46 25 35 244 -64 -37 53 48 -38 14 30 -36 46 38 -39 20 14
161 0 0 -38 11 52 14 46 17 34 244 -64 -38 1 33 -38 22 11 -36 54 35 -39 27 43
162 0 0 -38 18 34 14 46 9 33 244 -63 -38 8 16 -38 28 50 -37 1 29 -39 34 12
163 0 0 -38 24 14 14 46 1 33 243 -62 -38 13 57 -38 34 29 -37 7 19 -39 39 43
164 0 0 -38 28 54 14 45 54 32 243 -62 -38 18 38 -38 39 8 -37 12 7 -39 44 16
165 0 0 -38 32 34 14 45 46 32 243 -61 -38 22 19 -38 42 48 -37 15 53 -39 47 51
166 0 0 -38 35 15 14 45 39 31 242 -60 -38 25 0 -38 45 28 -37 18 37 -39 50 28
167 0 0 -38 36 56 14 45 31 30 242 -60 -38 26 42 -38 47 9 -37 20 19 -39 52 7
168 0 0 -38 37 38 14 45 24 30 242 -59 -38 27 23 -38 47 50 -37 21 0 -39 52 50
169 0 0 -38 37 20 14 45 17 29 241 -58 -38 27 5 -38 47 33 -37 20 39 -39 52 35
170 0 0 -38 36 3 14 45 11 28 241 -58 -38 25 47 -38 46 16 -37 19 17 -39 51 22
171 0 0 -38 33 45 14 45 4 28 240 -57 -38 23 29 -38 44 0 -37 16 52 -39 49 12
172 0 0 -38 30 28 14 44 57 27 240 -56 -38 20 10 -38 40 44 -37 13 26 -39 46 3
173 0 0 -38 26 10 14 44 51 26 239 -56 -38 15 51 -38 36 28 -37 8 56 -39 41 57
174 0 0 -38 20 51 14 44 45 25 239 -55 -38 10 30 -38 31 11 -37 3 23 -39 36 51
175 0 0 -38 14 30 14 44 38 25 239 -54 -38 4 7 -38 24 52 -36 56 45 -39 30 45
176 0 0 -38 7 6 14 44 32 24 238 -54 -37 56 41 -38 17 31 -36 49 2 -39 23 39
177 0 0 -37 58 39 14 44 26 23 238 -53 -37 48 11 -38 9 6 -36 40 14 -39 15 32
178 0 0 -37 49 7 14 44 21 23 237 -52 -37 38 35 -37 59 37 -36 30 17 -39 6 22
179 0 0 -37 38 29 14 44 15 22 237 -52 -37 27 54 -37 49 2 -36 19 13 -38 56 9
180 0 0 -37 26 43 14 44 10 21 236 -51 -37 16 4 -37 37 21 -36 6 58 -38 44 52
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