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Updated: 2006 DEC 15, 04:52 UT
Event Rank : 16
(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 2007 Jan 11 UT, the 32 km diameter asteroid (3759) Piironen will occult a 9.0 mag star in the constellation Crater for observers along a large uncertainty path across Northern Territory and South Australia, passing directly over Darwin and Alice Springs and near Adelaide.
In the case of an occultation, the combined light of the asteroid and the star will drop by 7.6 mag to 16.6 mag (the magnitude of the asteroid) for at most 2.9 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 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
130 16 23 - 9 50 58 17 28 12 55 98 -47 130 26 30 - 9 48 47 130 6 15 - 9 53 9 131 49 56 - 9 30 11 128 40 48 -10 11 3
130 40 15 -11 2 58 17 28 25 56 96 -45 130 50 22 -11 0 46 130 30 6 -11 5 11 132 13 56 -10 42 2 129 4 32 -11 23 13
131 3 10 -12 14 49 17 28 37 56 95 -44 131 13 19 -12 12 35 130 53 0 -12 17 2 132 37 3 -11 53 43 129 27 15 -12 35 13
131 25 11 -13 26 31 17 28 50 57 93 -43 131 35 21 -13 24 16 131 14 59 -13 28 45 132 59 19 -13 5 16 129 49 0 -13 47 5
131 46 19 -14 38 7 17 29 3 57 91 -42 131 56 32 -14 35 52 131 36 6 -14 40 22 133 20 47 -14 16 43 130 9 50 -14 58 51
132 6 38 -15 49 40 17 29 15 58 89 -41 132 16 53 -15 47 23 131 56 22 -15 51 56 133 41 29 -15 28 6 130 29 45 -16 10 34
132 26 10 -17 1 12 17 29 28 58 87 -40 132 36 27 -16 58 54 132 15 50 -17 3 29 134 1 27 -16 39 28 130 48 49 -17 22 16
132 44 54 -18 12 44 17 29 40 58 85 -39 132 55 15 -18 10 25 132 34 32 -18 15 2 134 20 42 -17 50 49 131 7 2 -18 33 58
133 2 54 -19 24 18 17 29 53 58 83 -37 133 13 19 -19 21 58 132 52 28 -19 26 38 134 39 16 -19 2 14 131 24 26 -19 45 43
133 20 10 -20 35 58 17 30 5 59 81 -36 133 30 39 -20 33 37 133 9 40 -20 38 19 134 57 10 -20 13 43 131 41 2 -20 57 34
133 36 43 -21 47 44 17 30 18 59 78 -35 133 47 17 -21 45 22 133 26 8 -21 50 6 135 14 26 -21 25 18 131 56 51 -22 9 31
133 52 35 -22 59 40 17 30 30 59 76 -34 134 3 13 -22 57 16 133 41 54 -23 2 3 135 31 4 -22 37 2 132 11 53 -23 21 38
134 7 45 -24 11 47 17 30 43 59 74 -33 134 18 29 -24 9 22 133 56 59 -24 14 11 135 47 5 -23 48 57 132 26 9 -24 33 56
134 22 13 -25 24 7 17 30 55 58 72 -32 134 33 4 -25 21 41 134 11 21 -25 26 32 136 2 29 -25 1 5 132 39 39 -25 46 28
134 36 1 -26 36 42 17 31 8 58 70 -31 134 46 58 -26 34 15 134 25 2 -26 39 9 136 17 17 -26 13 28 132 52 23 -26 59 16
134 49 8 -27 49 36 17 31 20 58 68 -30 135 0 12 -27 47 7 134 38 2 -27 52 4 136 31 30 -27 26 8 133 4 21 -28 12 23
135 1 34 -29 2 50 17 31 33 58 66 -29 135 12 46 -29 0 20 134 50 20 -29 5 20 136 45 7 -28 39 8 133 15 31 -29 25 50
135 13 17 -30 16 27 17 31 45 57 64 -28 135 24 38 -30 13 55 135 1 55 -30 18 58 136 58 8 -29 52 31 133 25 53 -30 39 41
135 24 19 -31 30 29 17 31 58 57 62 -26 135 35 48 -31 27 55 135 12 47 -31 33 2 137 10 33 -31 6 18 133 35 25 -31 53 57
135 34 36 -32 44 59 17 32 10 57 60 -25 135 46 16 -32 42 24 135 22 54 -32 47 33 137 22 20 -32 20 33 133 44 7 -33 8 42
135 44 8 -34 0 0 17 32 23 56 58 -24 135 55 59 -33 57 23 135 32 16 -34 2 36 137 33 31 -33 35 17 133 51 55 -34 23 59
135 52 54 -35 15 35 17 32 36 56 56 -23 136 4 56 -35 12 56 135 40 49 -35 18 13 137 44 2 -34 50 35 133 58 48 -35 39 50
136 0 50 -36 31 47 17 32 48 55 54 -22 136 13 5 -36 29 6 135 48 33 -36 34 27 137 53 52 -36 6 29 134 4 42 -36 56 19
136 7 54 -37 48 39 17 33 1 54 53 -21 136 20 23 -37 45 57 135 55 23 -37 51 21 138 3 1 -37 23 3 134 9 33 -38 13 29
136 14 3 -39 6 15 17 33 13 54 51 -20 136 26 46 -39 3 31 136 1 17 -39 8 59 138 11 24 -38 40 20 134 13 18 -39 31 24
136 19 13 -40 24 40 17 33 26 53 50 -19 136 32 12 -40 21 53 136 6 11 -40 27 26 138 19 1 -39 58 23 134 15 50 -40 50 8
136 23 19 -41 43 56 17 33 38 52 48 -18 136 36 36 -41 41 7 136 9 59 -41 46 44 138 25 46 -41 17 18 134 17 4 -42 9 45
136 26 15 -43 4 9 17 33 51 51 47 -16 136 39 52 -43 1 18 136 12 36 -43 7 0 138 31 37 -42 37 8 134 16 53 -43 30 19
136 27 55 -44 25 24 17 34 3 50 46 -15 136 41 53 -44 22 30 136 13 54 -44 28 17 138 36 28 -43 57 58 134 15 6 -44 51 56
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