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Updated: 2014 AUG 26, 20:01 UT
Event Rank : 73
(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 Sep 27 UT, the 121 km diameter asteroid (426) Hippo will occult a 12.3 mag star in the constellation Sagittarius for observers along a path across New Zealand, including much of the South Island and the North Island near Auckland.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 14.0 mag (the magnitude of the asteroid) for at most 7.7 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.
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
166 26 20 -50 41 31 11 40 2 35 267 -36 165 0 17 -50 36 32 167 54 38 -50 45 21 162 48 44 -50 26 30 170 19 1 -50 48 49
166 54 14 -49 47 59 11 40 8 35 266 -37 165 29 14 -49 43 23 168 21 29 -49 51 25 163 19 15 -49 33 56 170 44 11 -49 54 15
167 23 8 -48 54 12 11 40 15 34 265 -38 165 59 3 -48 50 0 168 49 27 -48 57 14 163 50 30 -48 41 11 171 10 37 -48 59 24
167 53 3 -48 0 9 11 40 21 34 264 -39 166 29 48 -47 56 23 169 18 32 -48 2 44 164 22 31 -47 48 13 171 38 23 -48 4 12
168 24 1 -47 5 47 11 40 27 33 263 -40 167 1 29 -47 2 27 169 48 46 -47 7 55 164 55 20 -46 54 58 172 7 30 -47 8 36
168 56 4 -46 11 3 11 40 34 33 262 -41 167 34 9 -46 8 12 170 20 13 -46 12 42 165 29 0 -46 1 25 172 38 1 -46 12 35
169 29 16 -45 15 56 11 40 40 32 261 -42 168 7 52 -45 13 34 170 52 55 -45 17 3 166 3 33 -45 7 32 173 9 59 -45 16 3
170 3 41 -44 20 21 11 40 46 32 260 -43 168 42 41 -44 18 30 171 26 56 -44 20 55 166 39 3 -44 13 15 173 43 29 -44 18 58
170 39 22 -43 24 15 11 40 53 31 259 -44 169 18 41 -43 22 58 172 2 21 -43 24 13 167 15 34 -43 18 33 174 18 36 -43 21 15
171 16 24 -42 27 34 11 40 59 31 258 -45 169 55 54 -42 26 54 172 39 16 -42 26 54 167 53 10 -42 23 22 174 55 27 -42 22 49
171 54 55 -41 30 15 11 41 5 30 257 -46 170 34 29 -41 30 13 173 17 47 -41 28 53 168 31 56 -41 27 38 175 34 8 -41 23 35
172 35 0 -40 32 12 11 41 12 29 256 -47 171 14 30 -40 32 52 173 58 1 -40 30 5 169 11 58 -40 31 18 176 14 51 -40 23 26
173 16 49 -39 33 19 11 41 18 28 255 -48 171 56 5 -39 34 46 174 40 9 -39 30 22 169 53 22 -39 34 17 176 57 45 -39 22 14
174 0 31 -38 33 31 11 41 24 28 254 -49 172 39 24 -38 35 48 175 24 21 -38 29 39 170 36 16 -38 36 30 177 43 6 -38 19 51
174 46 17 -37 32 40 11 41 31 27 253 -50 173 24 36 -37 35 52 176 10 52 -37 27 46 171 20 48 -37 37 52 178 31 11 -37 16 5
175 34 23 -36 30 36 11 41 37 26 253 -51 174 11 55 -36 34 50 176 59 57 -36 24 34 172 7 11 -36 38 16 179 22 22 -36 10 44
176 25 7 -35 27 10 11 41 43 25 252 -53 175 1 36 -35 32 33 177 51 58 -35 19 49 172 55 35 -35 37 35 -179 42 53 -35 3 30
177 18 50 -34 22 7 11 41 50 24 251 -54 175 53 57 -34 28 49 178 47 22 -34 13 15 173 46 16 -34 35 39 -178 43 57 -33 54 2
178 16 0 -33 15 12 11 41 56 23 250 -55 176 49 23 -33 23 26 179 46 42 -33 4 34 174 39 33 -33 32 18 -177 40 1 -32 41 51
179 17 15 -32 6 2 11 42 2 21 249 -56 177 48 22 -32 16 4 -179 9 17 -31 53 18 175 35 49 -32 27 18 -176 29 55 -31 26 17
Uncertainty in time = +/- 6 secs
Prediction of 2014 Aug 27.0
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
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