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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 07 UT, the 72 km diameter asteroid (127) Johanna will occult a 10.2 mag star in the constellation Aquarius for observers along a path across Australia.
In the case of an occultation, the combined light of the asteroid and the star will drop by 3.2 mag to 13.3 mag (the magnitude of the asteroid) for at most 24.5 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
... .. .. 17 0 0 .. .. .. .. .. .. 141 21 51 ... .. .. 140 52 3 ... .. ..
141 18 27 16 0 0 20 11 4 48 218 0 140 55 58 141 41 0 140 26 22 ... .. ..
140 52 55 15 0 0 20 11 35 48 219 -1 140 30 34 141 15 18 140 1 9 141 44 57
140 27 52 14 0 0 20 12 6 49 219 -2 140 5 39 140 50 7 139 36 25 141 19 34
140 3 16 13 0 0 20 12 38 50 219 -2 139 41 12 140 25 24 139 12 7 140 54 41
139 39 8 12 0 0 20 13 10 51 220 -3 139 17 10 140 1 8 138 48 15 140 30 16
139 15 26 11 0 0 20 13 42 52 220 -4 138 53 34 139 37 19 138 24 48 140 6 18
138 52 8 10 0 0 20 14 15 53 221 -4 138 30 23 139 13 56 138 1 44 139 42 46
138 29 15 9 0 0 20 14 48 54 222 -5 138 7 35 138 50 57 137 39 3 139 19 40
138 6 45 8 0 0 20 15 21 55 222 -5 137 45 10 138 28 22 137 16 45 138 56 59
137 44 38 7 0 0 20 15 55 56 223 -6 137 23 8 138 6 11 136 54 48 138 34 41
137 22 53 6 0 0 20 16 29 57 224 -7 137 1 26 137 44 21 136 33 12 138 12 46
137 1 29 5 0 0 20 17 3 58 225 -7 136 40 6 137 22 54 136 11 57 137 51 14
136 40 26 4 0 0 20 17 38 58 225 -8 136 19 7 137 1 48 135 51 1 137 30 4
136 19 44 3 0 0 20 18 12 59 226 -8 135 58 27 136 41 4 135 30 25 137 9 16
135 59 22 2 0 0 20 18 47 60 227 -9 135 38 7 136 20 39 135 10 7 136 48 48
135 39 19 1 0 0 20 19 23 61 228 -10 135 18 6 136 0 34 134 50 9 136 28 41
135 19 35 0 0 0 20 19 58 62 230 -10 134 58 24 135 40 50 134 30 28 136 8 55
135 0 11 - 1 0 0 20 20 34 62 231 -11 134 39 0 135 21 24 134 11 6 135 49 28
134 41 5 - 2 0 0 20 21 10 63 232 -11 134 19 54 135 2 17 133 52 1 135 30 21
134 22 17 - 3 0 0 20 21 46 64 234 -12 134 1 7 134 43 30 133 33 13 135 11 33
134 3 48 - 4 0 0 20 22 23 65 235 -12 133 42 37 134 25 0 133 14 42 134 53 4
133 45 36 - 5 0 0 20 22 59 65 237 -13 133 24 24 134 6 50 132 56 29 134 34 54
133 27 42 - 6 0 0 20 23 36 66 238 -13 133 6 30 133 48 57 132 38 33 134 17 3
133 10 6 - 7 0 0 20 24 13 67 240 -14 132 48 52 133 31 23 132 20 53 133 59 31
132 52 48 - 8 0 0 20 24 50 67 242 -14 132 31 32 133 14 7 132 3 30 133 42 18
132 35 48 - 9 0 0 20 25 27 68 244 -15 132 14 29 132 57 9 131 46 23 133 25 23
132 19 5 -10 0 0 20 26 4 68 246 -15 131 57 43 132 40 29 131 29 34 133 8 46
132 2 39 -11 0 0 20 26 41 69 248 -16 131 41 14 132 24 7 131 13 1 132 52 29
131 46 32 -12 0 0 20 27 19 69 251 -16 131 25 3 132 8 3 130 56 45 132 36 30
131 30 42 -13 0 0 20 27 56 70 253 -17 131 9 9 131 52 18 130 40 45 132 20 50
131 15 11 -14 0 0 20 28 34 70 256 -17 130 53 33 131 36 51 130 25 3 132 5 29
130 59 57 -15 0 0 20 29 12 70 258 -17 130 38 14 131 21 42 130 9 37 131 50 28
130 45 2 -16 0 0 20 29 49 71 261 -18 130 23 13 131 6 52 129 54 29 131 35 46
130 30 25 -17 0 0 20 30 27 71 264 -18 130 8 30 130 52 22 129 39 38 131 21 23
130 16 7 -18 0 0 20 31 5 71 267 -19 129 54 6 130 38 10 129 25 5 131 7 20
130 2 8 -19 0 0 20 31 43 71 270 -19 129 40 0 130 24 18 129 10 50 130 53 38
129 48 29 -20 0 0 20 32 21 71 273 -19 129 26 13 130 10 47 128 56 53 130 40 16
129 35 9 -21 0 0 20 32 58 71 276 -20 129 12 45 129 57 35 128 43 14 130 27 15
129 22 9 -22 0 0 20 33 36 71 279 -20 128 59 37 129 44 44 128 29 55 130 14 36
129 9 30 -23 0 0 20 34 14 71 281 -20 128 46 49 129 32 14 128 16 54 130 2 18
128 57 13 -24 0 0 20 34 52 71 284 -21 128 34 21 129 20 6 128 4 14 129 50 23
128 45 16 -25 0 0 20 35 29 70 287 -21 128 22 15 129 8 20 127 51 54 129 38 51
128 33 42 -26 0 0 20 36 7 70 290 -21 128 10 30 128 56 57 127 39 54 129 27 42
128 22 31 -27 0 0 20 36 44 70 292 -22 127 59 7 128 45 58 127 28 16 129 16 58
128 11 43 -28 0 0 20 37 22 69 295 -22 127 48 7 128 35 22 127 17 0 129 6 39
128 1 20 -29 0 0 20 37 59 69 297 -22 127 37 30 128 25 12 127 6 6 128 56 46
127 51 21 -30 0 0 20 38 36 68 299 -22 127 27 18 128 15 27 126 55 36 128 47 19
127 41 49 -31 0 0 20 39 14 68 302 -23 127 17 31 128 6 9 126 45 30 128 38 20
127 32 43 -32 0 0 20 39 51 67 304 -23 127 8 10 127 57 18 126 35 49 128 29 50
127 24 4 -33 0 0 20 40 27 67 306 -23 126 59 15 127 48 56 126 26 33 128 21 49
127 15 55 -34 0 0 20 41 4 66 307 -23 126 50 49 127 41 4 126 17 45 128 14 19
127 8 16 -35 0 0 20 41 41 66 309 -23 126 42 52 127 33 42 126 9 24 128 7 22
127 1 7 -36 0 0 20 42 17 65 311 -24 126 35 25 127 26 53 126 1 33 128 0 57
126 54 32 -37 0 0 20 42 53 64 312 -24 126 28 29 127 20 37 125 54 11 127 55 8
126 48 30 -38 0 0 20 43 29 64 314 -24 126 22 7 127 14 57 125 47 22 127 49 55
126 43 4 -39 0 0 20 44 5 63 315 -24 126 16 19 127 9 53 125 41 5 127 45 21
126 38 16 -40 0 0 20 44 40 62 316 -24 126 11 7 127 5 27 125 35 22 127 41 26
126 34 6 -41 0 0 20 45 15 61 317 -24 126 6 33 127 1 42 125 30 17 127 38 14
126 30 38 -42 0 0 20 45 50 60 318 -24 126 2 39 126 58 40 125 25 49 127 35 46
126 27 53 -43 0 0 20 46 25 60 319 -24 125 59 27 126 56 22 125 22 1 127 34 4
126 25 54 -44 0 0 20 47 0 59 320 -24 125 56 59 126 54 52 125 18 55 127 33 12
126 24 43 -45 0 0 20 47 34 58 321 -25 125 55 18 126 54 12 125 16 34 127 33 13
126 24 23 -46 0 0 20 48 8 57 322 -25 125 54 26 126 54 24 125 15 1 127 34 8
126 24 58 -47 0 0 20 48 42 56 323 -25 125 54 27 126 55 33 125 14 17 127 36 3
126 26 31 -48 0 0 20 49 15 55 323 -25 125 55 24 126 57 42 125 14 27 127 39 0
126 29 5 -49 0 0 20 49 48 55 324 -25 125 57 20 127 0 55 125 15 33 127 43 3
126 32 45 -50 0 0 20 50 21 54 324 -25 126 0 19 127 5 15 125 17 39 127 48 18
126 37 35 -51 0 0 20 50 53 53 325 -25 126 4 27 127 10 49 125 20 50 127 54 50
126 43 41 -52 0 0 20 51 25 52 325 -25 126 9 47 127 17 41 125 25 11 128 2 43
126 51 8 -53 0 0 20 51 57 51 326 -24 126 16 25 127 25 57 125 30 45 128 12 5
127 0 3 -54 0 0 20 52 28 50 326 -24 126 24 28 127 35 45 125 37 40 128 23 2
127 10 33 -55 0 0 20 52 59 49 326 -24 126 34 2 127 47 10 125 46 1 128 35 43
127 22 45 -56 0 0 20 53 30 48 326 -24 126 45 15 128 0 23 125 55 57 128 50 16
127 36 49 -57 0 0 20 54 0 47 326 -24 126 58 16 128 15 32 126 7 34 129 6 51
127 52 56 -58 0 0 20 54 30 46 326 -24 127 13 13 128 32 48 126 21 2 129 25 41
128 11 17 -59 0 0 20 55 0 45 326 -24 127 30 20 128 52 24 126 36 32 129 46 57
128 32 5 -60 0 0 20 55 29 44 326 -24 127 49 48 129 14 33 126 54 15 130 10 54
128 55 35 -61 0 0 20 55 57 43 326 -23 128 11 51 129 39 31 127 14 26 130 37 51
129 22 6 -62 0 0 20 56 26 42 326 -23 128 36 48 130 7 39 127 37 19 131 8 7
129 51 59 -63 0 0 20 56 54 41 326 -23 129 4 57 130 39 16 128 3 15 131 42 5
130 25 37 -64 0 0 20 57 21 40 326 -23 129 36 42 131 14 49 128 32 33 132 20 14
Latitude Latitude Latitude Latitude
131 0 0 -64 54 45 20 57 46 40 325 -23 -66 9 51 -63 35 51 -67 44 4 -61 44 34
132 0 0 -66 17 59 20 58 23 38 324 -22 -67 25 55 -65 7 18 -68 51 55 -63 29 3
133 0 0 -67 29 11 20 58 54 37 324 -22 -68 31 34 -66 24 43 -69 51 5 -64 55 56
134 0 0 -68 31 13 20 59 20 36 323 -22 -69 29 9 -67 31 38 -70 43 20 -66 10 9
135 0 0 -69 25 59 20 59 43 35 322 -21 -70 20 14 -68 30 24 -71 29 59 -67 14 46
136 0 0 -70 14 52 21 0 4 34 321 -21 -71 6 0 -69 22 37 -72 11 58 -68 11 48
137 0 0 -70 58 51 21 0 22 33 320 -21 -71 47 20 -70 9 27 -72 50 0 -69 2 41
138 0 0 -71 38 43 21 0 38 32 319 -21 -72 24 52 -70 51 46 -73 24 40 -69 48 29
139 0 0 -72 15 3 21 0 53 32 318 -20 -72 59 10 -71 30 15 -73 56 26 -70 29 59
140 0 0 -72 48 21 21 1 6 31 317 -20 -73 30 39 -72 5 27 -74 25 38 -71 7 50
141 0 0 -73 18 59 21 1 18 31 317 -20 -73 59 40 -72 37 46 -74 52 36 -71 42 31
142 0 0 -73 47 16 21 1 30 30 316 -20 -74 26 29 -73 7 35 -75 17 35 -72 14 27
143 0 0 -74 13 29 21 1 40 29 315 -20 -74 51 22 -73 35 10 -75 40 47 -72 43 56
144 0 0 -74 37 50 21 1 50 29 314 -19 -75 14 31 -74 0 47 -76 2 24 -73 11 16
145 0 0 -75 0 31 21 1 59 29 313 -19 -75 36 6 -74 24 37 -76 22 34 -73 36 40
146 0 0 -75 21 43 21 2 7 28 312 -19 -75 56 16 -74 46 51 -76 41 26 -74 0 20
147 0 0 -75 41 32 21 2 15 28 311 -19 -76 15 9 -75 7 38 -76 59 7 -74 22 26
148 0 0 -76 0 7 21 2 23 27 310 -19 -76 32 52 -75 27 7 -77 15 43 -74 43 8
149 0 0 -76 17 34 21 2 30 27 309 -19 -76 49 30 -75 45 23 -77 31 20 -75 2 32
150 0 0 -76 33 58 21 2 36 27 308 -18 -77 5 10 -76 2 33 -77 46 1 -75 20 45
151 0 0 -76 49 25 21 2 42 26 307 -18 -77 19 55 -76 18 43 -77 59 52 -75 37 52
152 0 0 -77 3 59 21 2 48 26 306 -18 -77 33 49 -76 33 57 -78 12 56 -75 54 0
153 0 0 -77 17 43 21 2 54 26 305 -18 -77 46 57 -76 48 19 -78 25 17 -76 9 13
154 0 0 -77 30 42 21 2 59 25 304 -18 -77 59 22 -77 1 53 -78 36 57 -76 23 34
155 0 0 -77 42 59 21 3 4 25 303 -18 -78 11 6 -77 14 42 -78 48 0 -76 37 8
156 0 0 -77 54 35 21 3 9 25 302 -18 -78 22 12 -77 26 50 -78 58 27 -76 49 57
157 0 0 -78 5 35 21 3 14 24 301 -18 -78 32 43 -77 38 18 -79 8 21 -77 2 5
158 0 0 -78 16 0 21 3 19 24 300 -17 -78 42 41 -77 49 10 -79 17 44 -77 13 34
159 0 0 -78 25 52 21 3 23 24 299 -17 -78 52 8 -77 59 28 -79 26 38 -77 24 26
160 0 0 -78 35 13 21 3 27 24 298 -17 -79 1 6 -78 9 14 -79 35 5 -77 34 44
161 0 0 -78 44 5 21 3 31 23 297 -17 -79 9 35 -78 18 29 -79 43 5 -77 44 30
162 0 0 -78 52 30 21 3 35 23 296 -17 -79 17 39 -78 27 15 -79 50 41 -77 53 46
163 0 0 -79 0 29 21 3 39 23 295 -17 -79 25 18 -78 35 35 -79 57 54 -78 2 32
164 0 0 -79 8 3 21 3 42 23 294 -17 -79 32 33 -78 43 28 -80 4 44 -78 10 52
165 0 0 -79 15 14 21 3 46 22 293 -17 -79 39 26 -78 50 57 -80 11 14 -78 18 45
166 0 0 -79 22 3 21 3 49 22 292 -17 -79 45 57 -78 58 3 -80 17 23 -78 26 14
167 0 0 -79 28 30 21 3 52 22 291 -17 -79 52 8 -79 4 46 -80 23 14 -78 33 20
168 0 0 -79 34 37 21 3 55 22 290 -16 -79 58 0 -79 11 9 -80 28 46 -78 40 3
169 0 0 -79 40 24 21 3 59 22 289 -16 -80 3 33 -79 17 11 -80 34 0 -78 46 24
170 0 0 -79 45 53 21 4 1 21 288 -16 -80 8 49 -79 22 53 -80 38 58 -78 52 25
171 0 0 -79 51 4 21 4 4 21 287 -16 -80 13 47 -79 28 18 -80 43 40 -78 58 7
172 0 0 -79 55 59 21 4 7 21 286 -16 -80 18 29 -79 33 24 -80 48 6 -79 3 29
173 0 0 -80 0 36 21 4 10 21 285 -16 -80 22 55 -79 38 13 -80 52 17 -79 8 34
174 0 0 -80 4 58 21 4 13 21 285 -16 -80 27 6 -79 42 45 -80 56 14 -79 13 20
175 0 0 -80 9 4 21 4 15 20 284 -16 -80 31 2 -79 47 2 -80 59 57 -79 17 51
176 0 0 -80 12 55 21 4 18 20 283 -16 -80 34 44 -79 51 3 -81 3 27 -79 22 4
177 0 0 -80 16 32 21 4 20 20 282 -16 -80 38 12 -79 54 49 -81 6 44 -79 26 2
178 0 0 -80 19 55 21 4 23 20 281 -16 -80 41 27 -79 58 20 -81 9 48 -79 29 45
179 0 0 -80 23 5 21 4 25 20 280 -16 -80 44 29 -80 1 37 -81 12 39 -79 33 12
180 0 0 -80 26 1 21 4 28 20 279 -15 -80 47 18 -80 4 41 -81 15 19 -79 36 26
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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