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Updated: 2005 MAR 22, 23:34 UT
Event Rank : 84
(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 Apr 18 UT, the 61 km diameter asteroid (342) Endymion will occult a 12.0 mag star in the constellation Sextans for observers along a path across Australia, SE Asia, China, Russia.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.4 mag to 14.2 mag (the magnitude of the asteroid) for at most 12.8 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
109 58 10 - 7 0 0 15 16 10 67 281 -69 110 17 18 109 39 5 110 40 42 109 15 52
110 23 49 - 8 0 0 15 15 46 66 283 -70 110 43 2 110 4 39 111 6 32 109 41 19
110 50 1 - 9 0 0 15 15 22 65 285 -70 111 9 20 110 30 45 111 32 58 110 7 19
111 16 48 -10 0 0 15 14 59 65 287 -70 111 36 14 110 57 26 111 59 59 110 33 52
111 44 12 -11 0 0 15 14 35 64 288 -71 112 3 44 111 24 42 112 27 38 111 1 0
112 12 12 -12 0 0 15 14 11 64 290 -71 112 31 52 111 52 35 112 55 55 111 28 44
112 40 52 -13 0 0 15 13 48 63 292 -72 113 0 40 112 21 7 113 24 53 111 57 6
113 10 12 -14 0 0 15 13 24 62 293 -72 113 30 8 112 50 18 113 54 33 112 26 7
113 40 14 -15 0 0 15 13 1 61 294 -72 114 0 20 113 20 12 114 24 56 112 55 49
Latitude Latitude Latitude Latitude
114 0 0 -15 38 42 15 12 46 61 295 -72 -14 59 21 -16 17 45 -14 10 53 -17 4 59
115 0 0 -17 32 33 15 12 1 59 297 -72 -16 54 24 -18 10 26 -16 7 27 -18 56 17
116 0 0 -19 21 9 15 11 20 58 299 -72 -18 44 6 -19 57 57 -17 58 33 -20 42 30
117 0 0 -21 4 47 15 10 40 56 300 -72 -20 28 46 -21 40 34 -19 44 31 -22 23 55
118 0 0 -22 43 41 15 10 3 55 301 -72 -22 8 39 -23 18 31 -21 25 37 -24 0 45
119 0 0 -24 18 7 15 9 27 53 302 -72 -23 43 59 -24 52 3 -23 2 5 -25 33 13
120 0 0 -25 48 17 15 8 54 52 303 -71 -25 15 1 -26 21 23 -24 34 10 -27 1 33
121 0 0 -27 14 24 15 8 23 50 304 -70 -26 41 56 -27 46 43 -26 2 6 -28 25 55
122 0 0 -28 36 40 15 7 53 49 304 -70 -28 4 58 -29 8 14 -27 26 4 -29 46 32
123 0 0 -29 55 16 15 7 25 48 304 -69 -29 24 17 -30 26 7 -28 46 17 -31 3 34
124 0 0 -31 10 22 15 6 58 46 305 -68 -30 40 4 -31 40 33 -30 2 55 -32 17 11
125 0 0 -32 22 9 15 6 33 45 305 -67 -31 52 30 -32 51 41 -31 16 9 -33 27 33
126 0 0 -33 30 46 15 6 9 44 305 -67 -33 1 44 -33 59 41 -32 26 9 -34 34 49
127 0 0 -34 36 22 15 5 47 42 305 -66 -34 7 55 -35 4 42 -33 33 4 -35 39 8
128 0 0 -35 39 5 15 5 25 41 304 -65 -35 11 12 -36 6 52 -34 37 2 -36 40 38
129 0 0 -36 39 4 15 5 5 40 304 -64 -36 11 43 -37 6 19 -35 38 13 -37 39 27
130 0 0 -37 36 26 15 4 46 39 304 -63 -37 9 35 -38 3 11 -36 36 43 -38 35 42
131 0 0 -38 31 18 15 4 28 38 304 -62 -38 4 57 -38 57 34 -37 32 41 -39 29 30
132 0 0 -39 23 48 15 4 11 37 303 -62 -38 57 55 -39 49 37 -38 26 13 -40 20 59
133 0 0 -40 14 2 15 3 55 36 303 -61 -39 48 35 -40 39 24 -39 17 26 -41 10 15
134 0 0 -41 2 6 15 3 40 35 303 -60 -40 37 4 -41 27 3 -40 6 27 -41 57 23
135 0 0 -41 48 5 15 3 25 34 302 -59 -41 23 28 -42 12 38 -40 53 21 -42 42 29
136 0 0 -42 32 7 15 3 11 33 302 -58 -42 7 53 -42 56 16 -41 38 14 -43 25 39
137 0 0 -43 14 14 15 2 58 32 301 -58 -42 50 23 -43 38 2 -42 21 11 -44 6 58
138 0 0 -43 54 34 15 2 46 31 301 -57 -43 31 3 -44 18 0 -43 2 17 -44 46 31
139 0 0 -44 33 9 15 2 34 30 300 -56 -44 9 59 -44 56 15 -43 41 38 -45 24 22
140 0 0 -45 10 5 15 2 23 29 300 -56 -44 47 15 -45 32 52 -44 19 18 -46 0 35
141 0 0 -45 45 26 15 2 12 28 299 -55 -45 22 54 -46 7 54 -44 55 20 -46 35 15
142 0 0 -46 19 15 15 2 2 27 298 -54 -45 57 1 -46 41 26 -45 29 49 -47 8 25
143 0 0 -46 51 37 15 1 53 26 298 -53 -46 29 40 -47 13 31 -46 2 49 -47 40 10
144 0 0 -47 22 35 15 1 44 25 297 -53 -47 0 54 -47 44 13 -46 34 23 -48 10 32
145 0 0 -47 52 12 15 1 35 25 297 -52 -47 30 47 -48 13 34 -47 4 35 -48 39 35
146 0 0 -48 20 32 15 1 27 24 296 -51 -47 59 21 -48 41 39 -47 33 27 -49 7 21
147 0 0 -48 47 36 15 1 19 23 295 -51 -48 26 40 -49 8 29 -48 1 4 -49 33 55
148 0 0 -49 13 29 15 1 12 22 295 -50 -48 52 46 -49 34 9 -48 27 26 -49 59 17
149 0 0 -49 38 12 15 1 5 22 294 -50 -49 17 43 -49 58 39 -48 52 39 -50 23 32
150 0 0 -50 1 49 15 0 58 21 293 -49 -49 41 31 -50 22 3 -49 16 43 -50 46 41
151 0 0 -50 24 20 15 0 52 20 292 -48 -50 4 15 -50 44 23 -49 39 41 -51 8 47
152 0 0 -50 45 50 15 0 46 19 292 -48 -50 25 56 -51 5 42 -50 1 35 -51 29 52
153 0 0 -51 6 19 15 0 40 19 291 -47 -50 46 36 -51 26 0 -50 22 28 -51 49 58
154 0 0 -51 25 50 15 0 35 18 290 -47 -51 6 17 -51 45 21 -50 42 22 -52 9 6
155 0 0 -51 44 25 15 0 29 17 290 -46 -51 25 1 -52 3 46 -51 1 18 -52 27 19
156 0 0 -52 2 4 15 0 24 17 289 -46 -51 42 50 -52 21 16 -51 19 18 -52 44 39
157 0 0 -52 18 50 15 0 20 16 288 -45 -51 59 45 -52 37 54 -51 36 24 -53 1 6
158 0 0 -52 34 45 15 0 15 15 287 -44 -52 15 48 -52 53 40 -51 52 37 -53 16 42
159 0 0 -52 49 49 15 0 11 15 287 -44 -52 31 0 -53 8 37 -52 7 58 -53 31 29
160 0 0 -53 4 5 15 0 7 14 286 -43 -52 45 23 -53 22 45 -52 22 30 -53 45 28
161 0 0 -53 17 33 15 0 3 13 285 -43 -52 58 57 -53 36 6 -52 36 14 -53 58 41
162 0 0 -53 30 14 15 0 0 13 284 -42 -53 11 45 -53 48 40 -52 49 9 -54 11 7
163 0 0 -53 42 9 14 59 57 12 283 -42 -53 23 47 -54 0 30 -53 1 19 -54 22 50
164 0 0 -53 53 21 14 59 53 12 283 -41 -53 35 4 -54 11 35 -53 12 43 -54 33 48
165 0 0 -54 3 48 14 59 50 11 282 -41 -53 45 37 -54 21 58 -53 23 22 -54 44 4
166 0 0 -54 13 33 14 59 48 10 281 -40 -53 55 27 -54 31 38 -53 33 18 -54 53 38
167 0 0 -54 22 37 14 59 45 10 280 -40 -54 4 35 -54 40 36 -53 42 32 -55 2 31
168 0 0 -54 30 59 14 59 43 9 280 -39 -54 13 1 -54 48 54 -53 51 3 -55 10 44
169 0 0 -54 38 40 14 59 40 9 279 -39 -54 20 46 -54 56 32 -53 58 53 -55 18 17
170 0 0 -54 45 42 14 59 38 8 278 -38 -54 27 51 -55 3 30 -54 6 3 -55 25 11
171 0 0 -54 52 4 14 59 36 7 277 -38 -54 34 17 -55 9 49 -54 12 32 -55 31 26
172 0 0 -54 57 48 14 59 34 7 276 -37 -54 40 3 -55 15 30 -54 18 22 -55 37 4
173 0 0 -55 2 53 14 59 33 6 276 -37 -54 45 11 -55 20 33 -54 23 32 -55 42 3
174 0 0 -55 7 20 14 59 31 6 275 -36 -54 49 40 -55 24 58 -54 28 4 -55 46 26
175 0 0 -55 11 9 14 59 30 5 274 -36 -54 53 31 -55 28 45 -54 31 57 -55 50 11
176 0 0 -55 14 21 14 59 29 5 273 -35 -54 56 44 -55 31 56 -54 35 12 -55 53 20
177 0 0 -55 16 56 14 59 28 4 272 -35 -54 59 20 -55 34 30 -54 37 49 -55 55 52
178 0 0 -55 18 53 14 59 27 3 271 -34 -55 1 18 -55 36 26 -54 39 49 -55 57 48
179 0 0 -55 20 14 14 59 26 3 271 -34 -55 2 39 -55 37 47 -54 41 10 -55 59 8
180 0 0 -55 20 58 14 59 25 2 270 -33 -55 3 23 -55 38 30 -54 41 54 -55 59 52
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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