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Updated: 2011 Mar 06, 18:49 UT
Event Rank : 5
(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 2011 Apr 27 UT, the 12 km diameter asteroid (3167) Babcock will occult a 8.0 mag star in the constellation Corona Australis for observers along a narrow, large uncertainty path across Queensland, New South Wales, Victoria and Tasmania.
In the case of an occultation, the combined light of the asteroid and the star will drop by 7.3 mag to 12.2 mag (the magnitude of the asteroid) for at most 1.3 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: .
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 HIP 90558 by 3167 Babcock on 2011 Apr 27
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
143 4 35 - 9 52 4 14 18 24 25 132 -86 143 10 20 - 9 54 22 142 58 48 - 9 49 45 145 24 5 -10 44 48 140 34 57 - 8 48 37
143 37 1 -11 27 20 14 18 36 27 131 -87 143 42 38 -11 29 28 143 31 23 -11 25 11 145 53 23 -12 16 22 141 11 53 -10 28 52
144 5 32 -12 58 51 14 18 47 28 131 -88 144 11 2 -13 0 50 144 0 1 -12 56 50 146 19 27 -13 44 47 141 43 54 -12 4 26
144 30 41 -14 27 9 14 18 59 30 130 -89 144 36 6 -14 29 2 144 25 16 -14 25 16 146 42 40 -15 10 29 142 11 48 -13 36 7
144 52 53 -15 52 42 14 19 11 31 129 -88 144 58 14 -15 54 29 144 47 32 -15 50 55 147 3 22 -16 33 47 142 36 10 -15 4 30
145 12 27 -17 15 50 14 19 22 32 129 -86 145 17 44 -17 17 32 145 7 10 -17 14 8 147 21 46 -17 54 59 142 57 25 -16 30 3
145 29 38 -18 36 51 14 19 34 33 128 -85 145 34 53 -18 38 27 145 24 23 -18 35 13 147 38 5 -19 14 18 143 15 55 -17 53 8
145 44 38 -19 55 57 14 19 46 34 128 -84 145 49 51 -19 57 30 145 39 25 -19 54 23 147 52 28 -20 31 55 143 31 54 -19 14 3
145 57 38 -21 13 21 14 19 57 35 127 -82 146 2 49 -21 14 51 145 52 26 -21 11 51 148 5 3 -21 48 2 143 45 37 -20 33 1
146 8 44 -22 29 13 14 20 9 36 126 -81 146 13 55 -22 30 40 146 3 33 -22 27 46 148 15 57 -23 2 46 143 57 12 -21 50 15
146 18 4 -23 43 42 14 20 21 37 125 -80 146 23 14 -23 45 6 146 12 53 -23 42 17 148 25 15 -24 16 14 144 6 47 -23 5 55
146 25 42 -24 56 54 14 20 33 38 125 -79 146 30 52 -24 58 16 146 20 31 -24 55 32 148 33 1 -25 28 34 144 14 30 -24 20 10
146 31 43 -26 8 56 14 20 44 38 124 -77 146 36 53 -26 10 16 146 26 32 -26 7 36 148 39 18 -26 39 50 144 20 25 -25 33 8
146 36 9 -27 19 55 14 20 56 39 123 -76 146 41 21 -27 21 13 146 30 57 -27 18 37 148 44 9 -27 50 8 144 24 36 -26 44 54
146 39 4 -28 29 55 14 21 8 40 122 -75 146 44 17 -28 31 11 146 33 51 -28 28 38 148 47 36 -28 59 32 144 27 7 -27 55 35
146 40 28 -29 39 0 14 21 19 41 121 -74 146 45 42 -29 40 15 146 35 14 -29 37 44 148 49 40 -30 8 7 144 28 0 -29 5 16
146 40 24 -30 47 14 14 21 31 41 121 -73 146 45 40 -30 48 28 146 35 8 -30 45 59 148 50 23 -31 15 55 144 27 15 -30 14 0
146 38 51 -31 54 41 14 21 43 42 120 -72 146 44 9 -31 55 54 146 33 33 -31 53 27 148 49 44 -32 23 0 144 24 55 -31 21 53
146 35 50 -33 1 24 14 21 55 42 119 -71 146 41 10 -33 2 36 146 30 29 -33 0 11 148 47 43 -33 29 25 144 20 59 -32 28 56
146 31 19 -34 7 26 14 22 6 43 118 -70 146 36 42 -34 8 38 146 25 56 -34 6 14 148 44 20 -34 35 13 144 15 27 -33 35 15
146 25 19 -35 12 50 14 22 18 43 117 -69 146 30 45 -35 14 1 146 19 53 -35 11 38 148 39 34 -35 40 26 144 8 18 -34 40 50
146 17 48 -36 17 37 14 22 30 44 116 -67 146 23 17 -36 18 48 146 12 18 -36 16 25 148 33 23 -36 45 6 143 59 31 -35 45 45
146 8 43 -37 21 49 14 22 41 44 115 -66 146 14 15 -37 23 0 146 3 10 -37 20 38 148 25 45 -37 49 15 143 49 4 -36 50 2
145 58 2 -38 25 30 14 22 53 44 114 -65 146 3 38 -38 26 40 145 52 26 -38 24 18 148 16 39 -38 52 55 143 36 54 -37 53 43
145 45 43 -39 28 39 14 23 5 45 113 -64 145 51 23 -39 29 50 145 40 3 -39 27 28 148 6 1 -39 56 8 143 22 58 -38 56 48
145 31 42 -40 31 19 14 23 17 45 113 -63 145 37 26 -40 32 30 145 25 58 -40 30 7 147 53 48 -40 58 54 143 7 14 -39 59 21
145 15 55 -41 33 31 14 23 28 45 112 -62 145 21 44 -41 34 42 145 10 6 -41 32 19 147 39 56 -42 1 16 142 49 36 -41 1 21
144 58 17 -42 35 15 14 23 40 45 111 -61 145 4 11 -42 36 27 144 52 24 -42 34 2 147 24 21 -43 3 14 142 30 0 -42 2 50
144 38 44 -43 36 33 14 23 52 46 110 -60 144 44 43 -43 37 46 144 32 45 -43 35 20 147 6 58 -44 4 48 142 8 22 -43 3 49
144 17 9 -44 37 25 14 24 3 46 109 -59 144 23 13 -44 38 39 144 11 5 -44 36 11 146 47 41 -45 6 1 141 44 34 -44 4 18
Uncertainty in time = +/- 18 secs
Prediction of 2011 Mar 6.0
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[Observing Details]
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