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Updated: 2015 Sep 18, 22:43 UT
Event Rank : 80
(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 2015 Oct 25 UT, the 89 km diameter asteroid (697) Galilea will occult a 11.0 mag star in the constellation Aquarius for observers along a path across Northern Territory, western Queensland, central and south-eastern New South Wales, passing over Forbes, Canberra and Batemans Bay. The path will then cross New Zealand, passing over Invercargill.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.8 mag to 13.7 mag (the magnitude of the asteroid) for at most 12.3 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, 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.
Occultation of TYC 5819-01046-1 by 697 Galilea on 2015 Oct 25
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
132 19 5 -10 0 0 13 39 45 63 258 -61 132 48 45 131 49 35 133 28 44 131 10 16
132 45 1 -11 0 0 13 39 29 63 260 -61 133 14 53 132 15 18 133 55 9 131 35 43
133 11 45 -12 0 0 13 39 12 62 262 -60 133 41 51 132 41 49 134 22 25 132 1 57
133 39 21 -13 0 0 13 38 56 62 264 -59 134 9 41 133 9 10 134 50 36 132 28 59
134 7 50 -14 0 0 13 38 40 62 266 -59 134 38 26 133 37 24 135 19 42 132 56 53
134 37 14 -15 0 0 13 38 24 62 268 -58 135 8 7 134 6 32 135 49 47 133 25 39
135 7 37 -16 0 0 13 38 7 61 269 -58 135 38 48 134 36 36 136 20 52 133 55 20
136 0 0 -17 39 5 13 37 40 60 272 -57 -16 40 21 -18 36 49 -15 19 57 -19 52 44
137 0 0 -19 26 14 13 37 11 59 275 -55 -18 29 49 -20 21 45 -17 12 45 -21 34 52
138 0 0 -21 7 10 13 36 44 58 277 -54 -20 12 52 -22 0 42 -18 58 46 -23 11 17
139 0 0 -22 42 27 13 36 18 57 279 -53 -21 50 2 -23 34 10 -20 38 36 -24 42 27
140 0 0 -24 12 30 13 35 53 56 281 -52 -23 21 48 -25 2 35 -22 12 47 -26 8 45
141 0 0 -25 37 44 13 35 30 55 282 -51 -24 48 35 -26 26 17 -23 41 47 -27 30 31
142 0 0 -26 58 28 13 35 8 54 283 -50 -26 10 46 -27 45 39 -25 5 59 -28 48 5
143 0 0 -28 15 3 13 34 47 53 284 -49 -27 28 41 -29 0 57 -26 25 45 -30 1 43
144 0 0 -29 27 45 13 34 27 52 285 -48 -28 42 36 -30 12 27 -27 41 23 -31 11 41
145 0 0 -30 36 48 13 34 9 51 286 -47 -29 52 48 -31 20 23 -28 53 10 -32 18 11
146 0 0 -31 42 27 13 33 51 50 286 -46 -30 59 31 -32 25 0 -30 1 21 -33 21 28
147 0 0 -32 44 54 13 33 34 49 287 -45 -32 2 58 -33 26 29 -31 6 10 -34 21 41
148 0 0 -33 44 20 13 33 18 48 287 -44 -33 3 20 -34 25 1 -32 7 49 -35 19 2
149 0 0 -34 40 57 13 33 2 47 287 -43 -34 0 48 -35 20 46 -33 6 30 -36 13 41
150 0 0 -35 34 52 13 32 48 46 287 -42 -34 55 33 -36 13 54 -34 2 22 -37 5 46
151 0 0 -36 26 16 13 32 34 45 287 -42 -35 47 42 -37 4 32 -34 55 35 -37 55 25
152 0 0 -37 15 16 13 32 20 44 287 -41 -36 37 26 -37 52 50 -35 46 18 -38 42 47
153 0 0 -38 1 59 13 32 8 43 287 -40 -37 24 51 -38 38 53 -36 34 39 -39 27 58
154 0 0 -38 46 34 13 31 55 42 287 -39 -38 10 4 -39 22 50 -37 20 46 -40 11 4
155 0 0 -39 29 5 13 31 44 41 287 -39 -38 53 12 -40 4 46 -38 4 44 -40 52 13
156 0 0 -40 9 40 13 31 33 40 287 -38 -39 34 21 -40 44 46 -38 46 40 -41 31 29
157 0 0 -40 48 23 13 31 22 39 286 -37 -40 13 37 -41 22 57 -39 26 41 -42 8 58
158 0 0 -41 25 21 13 31 12 38 286 -36 -40 51 5 -41 59 24 -40 4 52 -42 44 44
159 0 0 -42 0 36 13 31 2 37 286 -36 -41 26 50 -42 34 11 -40 41 17 -43 18 53
160 0 0 -42 34 15 13 30 53 37 285 -35 -42 0 57 -43 7 22 -41 16 1 -43 51 29
161 0 0 -43 6 21 13 30 44 36 285 -34 -42 33 29 -43 39 2 -41 49 10 -44 22 34
162 0 0 -43 36 58 13 30 35 35 285 -34 -43 4 31 -44 9 15 -42 20 46 -44 52 15
163 0 0 -44 6 10 13 30 27 34 284 -33 -43 34 7 -44 38 4 -42 50 54 -45 20 32
164 0 0 -44 34 0 13 30 19 33 284 -33 -44 2 20 -45 5 31 -43 19 37 -45 47 31
165 0 0 -45 0 32 13 30 11 33 283 -32 -44 29 12 -45 31 42 -43 46 59 -46 13 14
166 0 0 -45 25 48 13 30 4 32 283 -31 -44 54 48 -45 56 38 -44 13 2 -46 37 43
167 0 0 -45 49 50 13 29 57 31 282 -31 -45 19 10 -46 20 22 -44 37 50 -47 1 2
168 0 0 -46 12 43 13 29 50 30 281 -30 -45 42 21 -46 42 56 -45 1 26 -47 23 13
169 0 0 -46 34 28 13 29 43 30 281 -30 -46 4 23 -47 4 24 -45 23 51 -47 44 19
170 0 0 -46 55 6 13 29 37 29 280 -29 -46 25 18 -47 24 47 -45 45 8 -48 4 20
171 0 0 -47 14 42 13 29 31 28 280 -29 -46 45 8 -47 44 7 -46 5 19 -48 23 21
172 0 0 -47 33 16 13 29 25 28 279 -28 -47 3 57 -48 2 27 -46 24 27 -48 41 21
Uncertainty in time = +/- 8 secs
Prediction of 2015 Sep 19.0
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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