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Updated: 2005 MAR 23, 01:17 UT
Event Rank : 11
(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 2005 Apr 22 UT, the 10 km diameter asteroid 2005 AB will occult a 11.2 mag star in the constellation Bootes for observers along a path across Australia.
In the case of an occultation, the combined light of the asteroid and the star will drop by 4.8 mag to 16.0 mag (the magnitude of the asteroid) for at most 1.5 seconds.
This update is based on Ondrejov astrometry for the asteroid kindly provided by Jan Manek, 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 Limits Error Limits
E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' "
Longitude Longitude Longitude Longitude
... .. .. -47 0 0 .. .. .. .. .. .. ... .. .. ... .. .. ... .. .. 133 50 15
132 42 1 -46 0 0 13 59 51 1 28 -53 132 33 36 132 50 24 130 45 36 134 31 48
133 22 49 -45 0 0 13 59 50 2 28 -55 133 14 43 133 30 53 131 31 1 135 8 39
133 58 56 -44 0 0 13 59 48 3 27 -56 133 51 7 134 6 43 132 11 9 135 41 16
134 30 48 -43 0 0 13 59 46 4 27 -57 134 23 14 134 38 21 132 46 33 136 10 3
134 58 50 -42 0 0 13 59 43 5 27 -58 134 51 28 135 6 9 133 17 41 136 35 20
135 23 20 -41 0 0 13 59 40 6 26 -59 135 16 10 135 30 28 133 44 57 136 57 22
135 44 35 -40 0 0 13 59 36 7 26 -60 135 37 36 135 51 33 134 8 40 137 16 25
136 2 50 -39 0 0 13 59 31 8 26 -61 135 56 0 136 9 39 134 29 7 137 32 41
136 18 17 -38 0 0 13 59 26 9 26 -62 136 11 35 136 24 57 134 46 32 137 46 21
136 31 6 -37 0 0 13 59 20 10 26 -63 136 24 31 136 37 38 135 1 7 137 57 34
136 41 26 -36 0 0 13 59 14 11 26 -64 136 34 58 136 47 52 135 13 1 138 6 28
136 49 25 -35 0 0 13 59 7 12 26 -64 136 43 4 136 55 45 135 22 25 138 13 10
136 55 10 -34 0 0 13 59 0 13 26 -65 136 48 54 137 1 25 135 29 25 138 17 46
136 58 47 -33 0 0 13 58 52 14 26 -66 136 52 36 137 4 57 135 34 8 138 20 21
137 0 20 -32 0 0 13 58 44 15 26 -67 136 54 13 137 6 26 135 36 40 138 21 0
136 59 54 -31 0 0 13 58 35 16 26 -68 136 53 51 137 5 57 135 37 5 138 19 46
136 57 33 -30 0 0 13 58 25 17 27 -69 136 51 32 137 3 32 135 35 27 138 16 44
136 53 18 -29 0 0 13 58 16 18 27 -69 136 47 20 136 59 14 135 31 49 138 11 54
136 47 13 -28 0 0 13 58 5 18 27 -70 136 41 17 136 53 7 135 26 13 138 5 20
136 39 18 -27 0 0 13 57 54 19 27 -71 136 33 25 136 45 11 135 18 42 137 57 3
136 29 36 -26 0 0 13 57 43 20 28 -71 136 23 44 136 35 28 135 9 17 137 47 4
136 18 7 -25 0 0 13 57 31 21 28 -72 136 12 15 136 23 57 134 57 58 137 35 23
136 4 50 -24 0 0 13 57 19 21 28 -72 135 58 59 136 10 41 134 44 46 137 22 1
135 49 46 -23 0 0 13 57 6 22 29 -73 135 43 55 135 55 36 134 29 39 137 6 57
135 32 53 -22 0 0 13 56 52 23 29 -73 135 27 1 135 38 44 134 12 36 136 50 10
135 14 10 -21 0 0 13 56 38 24 30 -73 135 8 17 135 20 2 133 53 36 136 31 40
134 53 34 -20 0 0 13 56 24 24 30 -73 134 47 39 134 59 27 133 32 36 136 11 23
134 31 2 -19 0 0 13 56 8 25 31 -73 134 25 5 134 36 58 133 9 32 135 49 18
134 6 32 -18 0 0 13 55 53 26 31 -73 134 0 32 134 12 30 132 44 21 135 25 22
133 39 58 -17 0 0 13 55 36 26 32 -73 133 33 55 133 46 0 132 16 57 134 59 30
133 11 15 -16 0 0 13 55 19 27 33 -73 133 5 8 133 17 21 131 47 13 134 31 37
132 40 16 -15 0 0 13 55 2 27 33 -72 132 34 4 132 46 27 131 15 3 134 1 39
132 6 55 -14 0 0 13 54 44 28 34 -72 132 0 37 132 13 11 130 40 16 133 29 29
131 31 0 -13 0 0 13 54 25 28 35 -71 131 24 36 131 37 24 130 2 42 132 54 58
130 52 23 -12 0 0 13 54 5 29 35 -70 130 45 50 130 58 54 129 22 6 132 17 59
130 10 48 -11 0 0 13 53 45 29 36 -69 130 4 6 130 17 28 128 38 13 131 38 18
129 26 0 -10 0 0 13 53 24 29 37 -68 129 19 7 129 32 51 127 50 42 130 55 44
128 37 39 - 9 0 0 13 53 2 30 38 -67 128 30 33 128 44 43 126 59 8 130 10 0
127 45 20 - 8 0 0 13 52 39 30 39 -66 127 37 58 127 52 39 126 2 57 129 20 46
126 48 31 - 7 0 0 13 52 15 30 40 -65 126 40 51 126 56 9 125 1 28 128 27 38
125 46 33 - 6 0 0 13 51 49 30 41 -64 125 38 30 125 54 32 123 53 43 127 30 6
Latitude Latitude Latitude Latitude
124 0 0 - 4 28 31 13 51 8 30 42 -61 - 4 35 31 - 4 21 34 - 6 5 19 - 2 57 28
123 0 0 - 3 42 48 13 50 46 30 43 -60 - 3 49 34 - 3 36 2 - 5 16 32 - 2 14 18
122 0 0 - 3 0 49 13 50 24 29 44 -59 - 3 7 25 - 2 54 15 - 4 31 54 - 1 34 35
121 0 0 - 2 22 21 13 50 4 29 45 -58 - 2 28 47 - 2 15 56 - 3 51 5 - 0 58 6
120 0 0 - 1 47 10 13 49 44 29 45 -56 - 1 53 27 - 1 40 53 - 3 13 50 - 0 24 41
119 0 0 - 1 15 3 13 49 25 28 46 -55 - 1 21 13 - 1 8 54 - 2 39 54 0 5 51
118 0 0 - 0 45 52 13 49 6 28 47 -54 - 0 51 56 - 0 39 50 - 2 9 7 0 33 38
117 0 0 - 0 19 28 13 48 48 27 47 -53 - 0 25 26 - 0 13 32 - 1 41 18 0 58 47
116 0 0 0 4 16 13 48 30 27 48 -52 - 0 1 37 0 10 7 - 1 16 18 1 21 25
115 0 0 0 25 27 13 48 13 26 48 -51 0 19 39 0 31 13 - 0 54 1 1 41 38
114 0 0 0 44 10 13 47 57 26 49 -49 0 38 26 0 49 52 - 0 34 20 1 59 30
113 0 0 1 0 30 13 47 41 25 49 -48 0 54 50 1 6 9 - 0 17 9 2 15 5
112 0 0 1 14 31 13 47 26 24 49 -47 1 8 54 1 20 7 - 0 2 24 2 28 28
111 0 0 1 26 18 13 47 11 24 50 -46 1 20 43 1 31 51 0 10 0 2 39 40
110 0 0 1 35 51 13 46 57 23 50 -45 1 30 19 1 41 23 0 20 5 2 48 46
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