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Updated: 2014 JUL 08, 19:08 UT
Event Rank : 30
(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 2014 Aug 23 UT, the 75 km diameter asteroid (764) Gedania will occult a 12.3 mag star in the constellation Sagittarius for observers along a somewhat uncertain path across New Zealand near Auckland, Wellington and Gisborne.
In the case of an occultation, the combined light of the asteroid and the star will drop by 3.1 mag to 15.3 mag (the magnitude of the asteroid) for at most 130.6 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, 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 Limit1 Path Limit2 Error Limit1 Error Limit2
E. Longitude Latitude U.T. Alt Az Alt
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' "
Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude
-178 44 25 -44 39 10 11 2 10 42 287 -55 -179 25 31 -44 31 56 -178 2 45 -44 46 14 177 38 30 -43 58 1 -174 50 21 -45 15 31
-179 18 15 -43 41 31 11 5 20 42 286 -56 -179 58 40 -43 34 22 -178 37 17 -43 48 32 177 8 14 -43 0 46 -175 28 14 -44 17 34
-179 50 54 -42 44 8 11 8 29 42 285 -57 179 29 19 -42 37 2 -179 10 35 -42 51 4 176 38 53 -42 3 47 -176 4 38 -43 19 51
179 37 36 -41 46 57 11 11 39 42 284 -58 178 58 25 -41 39 56 -179 42 42 -41 53 50 176 10 26 -41 7 0 -176 39 36 -42 22 20
179 7 12 -40 49 58 11 14 48 42 283 -58 178 28 34 -40 43 1 179 46 21 -40 56 46 175 42 53 -40 10 26 -177 13 11 -41 25 0
178 37 54 -39 53 9 11 17 58 42 282 -59 177 59 46 -39 46 16 179 16 32 -39 59 53 175 16 12 -39 14 1 -177 45 25 -40 27 48
178 9 39 -38 56 28 11 21 7 42 281 -60 177 31 59 -38 49 40 178 47 49 -39 3 8 174 50 22 -38 17 46 -178 16 22 -39 30 44
177 42 27 -37 59 55 11 24 16 42 280 -61 177 5 13 -37 53 11 178 20 11 -38 6 29 174 25 24 -37 21 38 -178 46 2 -38 33 47
177 16 18 -37 3 26 11 27 26 42 279 -62 176 39 27 -36 56 47 177 53 37 -37 9 57 174 1 17 -36 25 36 -179 14 27 -37 36 53
176 51 10 -36 7 2 11 30 35 41 277 -63 176 14 40 -36 0 28 177 28 8 -36 13 28 173 38 1 -35 29 38 -179 41 38 -36 40 3
176 27 4 -35 10 41 11 33 45 41 276 -64 175 50 54 -35 4 11 177 3 42 -35 17 1 173 15 38 -34 33 44 179 52 26 -35 43 14
176 4 1 -34 14 20 11 36 54 41 275 -65 175 28 8 -34 7 56 176 40 22 -34 20 35 172 54 6 -33 37 51 179 27 44 -34 46 25
175 42 1 -33 17 59 11 40 3 41 274 -66 175 6 24 -33 11 40 176 18 6 -33 24 8 172 33 28 -32 41 59 179 4 17 -33 49 34
175 21 5 -32 21 35 11 43 13 40 273 -67 174 45 41 -32 15 22 175 56 56 -32 27 39 172 13 45 -31 46 5 178 42 6 -32 52 39
175 1 14 -31 25 8 11 46 22 40 272 -68 174 26 2 -31 19 0 175 36 53 -31 31 6 171 54 57 -30 50 8 178 21 11 -31 55 39
174 42 30 -30 28 35 11 49 32 40 271 -69 174 7 28 -30 22 34 175 18 0 -30 34 27 171 37 7 -29 54 7 178 1 36 -30 58 32
174 24 56 -29 31 55 11 52 41 39 270 -70 173 50 2 -29 26 0 175 0 18 -29 37 41 171 20 17 -28 58 0 177 43 21 -30 1 15
174 8 33 -28 35 5 11 55 51 39 269 -71 173 33 44 -28 29 17 174 43 49 -28 40 44 171 4 28 -28 1 44 177 26 29 -29 3 48
173 53 24 -27 38 5 11 59 0 38 268 -72 173 18 40 -27 32 23 174 28 36 -27 43 37 170 49 43 -27 5 20 177 11 5 -28 6 6
173 39 33 -26 40 51 12 2 9 38 267 -74 173 4 51 -26 35 16 174 14 44 -26 46 15 170 36 6 -26 8 43 176 57 12 -27 8 9
173 27 3 -25 43 21 12 5 19 37 266 -75 172 52 21 -25 37 54 174 2 15 -25 48 38 170 23 39 -25 11 53 176 44 54 -26 9 53
173 16 0 -24 45 33 12 8 28 37 265 -76 172 41 15 -24 40 15 173 51 15 -24 50 42 170 12 27 -24 14 48 176 34 17 -25 11 15
173 6 28 -23 47 25 12 11 38 36 264 -77 172 31 37 -23 42 16 173 41 49 -23 52 24 170 2 33 -23 17 24 176 25 28 -24 12 13
172 58 33 -22 48 53 12 14 47 35 263 -78 172 23 34 -22 43 53 173 34 2 -22 53 43 169 54 3 -22 19 40 176 18 33 -23 12 43
172 52 22 -21 49 55 12 17 56 34 262 -79 172 17 12 -21 45 5 173 28 3 -21 54 33 169 47 3 -21 21 33 176 13 43 -22 12 40
Uncertainty in time = +/- 393 secs
Prediction of 2014 Jul 9.0
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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