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Updated: 2014 JUN 22, 00:39 UT
Event Rank : 79
(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 11 UT, the 121 km diameter asteroid (426) Hippo will occult a 12.5 mag star in the constellation Sagittarius for observers along a path across New Zealand passing near Christchurch.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.2 mag to 13.3 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 Hugh Harris, 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
177 7 49 -56 40 1 7 15 31 58 57 -21 176 1 35 -56 50 0 178 13 5 -56 29 35 174 28 32 -57 3 2 179 41 35 -56 14 29
176 40 12 -55 23 51 7 15 45 59 59 -21 175 36 5 -55 33 37 177 43 24 -55 13 40 174 6 6 -55 46 22 179 9 10 -54 58 55
176 12 32 -54 8 8 7 16 0 59 62 -20 175 10 22 -54 17 40 177 13 51 -53 58 10 173 43 10 -54 30 8 178 37 6 -53 43 47
175 44 49 -52 52 47 7 16 14 60 64 -20 174 44 26 -53 2 7 176 44 24 -52 43 4 173 19 47 -53 14 19 178 5 21 -52 29 0
175 17 0 -51 37 48 7 16 28 60 67 -20 174 18 16 -51 46 55 176 15 0 -51 28 17 172 55 58 -51 58 51 177 33 49 -51 14 32
174 49 6 -50 23 5 7 16 43 60 69 -20 173 51 52 -50 32 1 175 45 37 -50 13 47 172 31 44 -50 43 41 177 2 28 -50 0 21
174 21 3 -49 8 38 7 16 57 60 72 -19 173 25 14 -49 17 22 175 16 12 -48 59 32 172 7 5 -49 28 46 176 31 15 -48 46 23
173 52 51 -47 54 23 7 17 11 60 74 -19 172 58 20 -48 2 55 174 46 45 -47 45 29 171 42 2 -48 14 4 176 0 6 -47 32 37
173 24 29 -46 40 17 7 17 25 60 77 -19 172 31 9 -46 48 37 174 17 12 -46 31 35 171 16 34 -46 59 32 175 28 59 -46 19 0
172 55 54 -45 26 18 7 17 40 60 79 -18 172 3 41 -45 34 27 173 47 32 -45 17 47 170 50 41 -45 45 7 174 57 51 -45 5 29
172 27 5 -44 12 23 7 17 54 60 82 -18 171 35 55 -44 20 22 173 17 43 -44 4 4 170 24 23 -44 30 47 174 26 40 -43 52 2
171 58 1 -42 58 30 7 18 8 60 84 -18 171 7 49 -43 6 18 172 47 42 -42 50 22 169 57 39 -43 16 29 173 55 24 -42 38 36
171 28 41 -41 44 37 7 18 23 60 87 -17 170 39 22 -41 52 13 172 17 29 -41 36 40 169 30 28 -42 2 10 173 24 0 -41 25 9
170 59 2 -40 30 40 7 18 37 60 89 -17 170 10 33 -40 38 6 171 47 1 -40 22 54 169 2 50 -40 47 48 172 52 26 -40 11 39
170 29 2 -39 16 37 7 18 51 59 92 -16 169 41 20 -39 23 52 171 16 16 -39 9 2 168 34 42 -39 33 20 172 20 40 -38 58 2
169 58 40 -38 2 26 7 19 6 59 94 -16 169 11 42 -38 9 30 170 45 12 -37 55 1 168 6 5 -38 18 43 171 48 38 -37 44 17
169 27 55 -36 48 3 7 19 20 59 96 -15 168 41 36 -36 54 57 170 13 46 -36 40 50 167 36 56 -37 3 55 171 16 20 -36 30 21
168 56 42 -35 33 27 7 19 34 58 98 -15 168 11 1 -35 40 10 169 41 58 -35 26 24 167 7 13 -35 48 53 170 43 42 -35 16 11
168 25 2 -34 18 34 7 19 48 57 101 -14 167 39 55 -34 25 6 169 9 43 -34 11 42 166 36 56 -34 33 34 170 10 41 -34 1 44
167 52 50 -33 3 21 7 20 3 57 103 -14 167 8 15 -33 9 42 168 37 0 -32 56 40 166 6 0 -33 17 55 169 37 16 -32 46 57
167 20 5 -31 47 45 7 20 17 56 105 -13 166 35 59 -31 53 54 168 3 46 -31 41 16 165 34 25 -32 1 52 169 3 23 -31 31 48
166 46 44 -30 31 43 7 20 31 55 106 -12 166 3 4 -30 37 41 167 29 58 -30 25 25 165 2 8 -30 45 22 168 29 0 -30 16 14
166 12 43 -29 15 11 7 20 46 55 108 -12 165 29 27 -29 20 57 166 55 34 -29 9 5 164 29 5 -29 28 22 167 54 2 -29 0 10
165 37 59 -27 58 6 7 21 0 54 110 -11 164 55 5 -28 3 40 166 20 28 -27 52 12 163 55 13 -28 10 47 167 18 27 -27 43 33
165 2 29 -26 40 23 7 21 14 53 112 -10 164 19 54 -26 45 44 165 44 38 -26 34 42 163 20 29 -26 52 34 166 42 11 -26 26 20
Uncertainty in time = +/- 9 secs
Prediction of 2014 Apr 1.0
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
[Timing Details]
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[Asteroid Occultation Results]
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