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Updated: 2008 MAR 31, 03:07 UT
Event Rank : 62
(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 2008 Apr 29 UT, the 60 km diameter asteroid (1048) Feodosia will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across central Australia.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.2 mag to 13.4 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
137 52 58 - 9 27 6 14 15 32 29 120 -81 138 23 19 - 9 38 56 137 22 10 - 9 14 57 139 21 34 -10 1 13 136 20 23 - 8 50 7
137 52 25 -10 21 37 14 15 44 29 120 -81 138 22 31 -10 33 15 137 21 52 -10 9 40 139 20 22 -10 55 13 136 20 38 - 9 45 16
137 50 31 -11 15 22 14 15 55 30 119 -82 138 20 26 -11 26 51 137 20 12 -11 3 36 139 17 56 -11 48 30 136 19 27 -10 39 34
137 47 21 -12 8 24 14 16 6 30 119 -82 138 17 6 -12 19 44 137 17 12 -11 56 47 139 14 19 -12 41 8 136 16 52 -11 33 5
137 42 56 -13 0 46 14 16 18 30 118 -82 138 12 32 -13 11 58 137 12 57 -12 49 17 139 9 31 -13 33 9 136 12 57 -12 25 52
137 37 18 -13 52 29 14 16 29 31 118 -83 138 6 48 -14 3 35 137 7 26 -13 41 7 139 3 35 -14 24 34 136 7 44 -13 17 57
137 30 28 -14 43 36 14 16 41 31 118 -83 137 59 53 -14 54 36 137 0 42 -14 32 19 138 56 31 -15 15 25 136 1 14 -14 9 23
137 22 28 -15 34 8 14 16 52 31 117 -82 137 51 49 -15 45 3 136 52 47 -15 22 56 138 48 21 -16 5 44 135 53 29 -15 0 10
137 13 19 -16 24 6 14 17 4 32 117 -82 137 42 37 -16 34 57 136 43 40 -16 12 58 138 39 5 -16 55 31 135 44 30 -15 50 22
137 3 0 -17 13 32 14 17 15 32 116 -82 137 32 16 -17 24 20 136 33 24 -17 2 28 138 28 43 -17 44 49 135 34 19 -16 39 59
136 51 33 -18 2 27 14 17 26 32 116 -81 137 20 49 -18 13 13 136 21 57 -17 51 25 138 17 16 -18 33 37 135 22 54 -17 29 2
136 38 57 -18 50 52 14 17 38 32 115 -81 137 8 14 -19 1 37 136 9 20 -18 39 52 138 4 44 -19 21 58 135 10 18 -18 17 33
136 25 12 -19 38 48 14 17 49 33 115 -80 136 54 31 -19 49 32 135 55 34 -19 27 50 137 51 5 -20 9 52 134 56 29 -19 5 33
136 10 18 -20 26 16 14 18 1 33 114 -80 136 39 40 -20 37 0 135 40 38 -20 15 18 137 36 21 -20 57 20 134 41 28 -19 53 2
135 54 15 -21 13 16 14 18 12 33 114 -79 136 23 40 -21 24 0 135 24 30 -21 2 18 137 20 30 -21 44 21 134 25 15 -20 40 2
135 37 1 -21 59 50 14 18 23 33 114 -79 136 6 31 -22 10 35 135 7 11 -21 48 50 137 3 31 -22 30 58 134 7 47 -21 26 32
135 18 35 -22 45 56 14 18 35 33 113 -78 135 48 12 -22 56 43 134 48 40 -22 34 55 136 45 23 -23 17 10 133 49 5 -22 12 34
134 58 57 -23 31 37 14 18 46 33 113 -77 135 28 41 -23 42 26 134 28 56 -23 20 33 136 26 6 -24 2 57 133 29 8 -22 58 7
134 38 5 -24 16 51 14 18 58 33 112 -77 135 7 57 -24 27 43 134 7 56 -24 5 45 136 5 37 -24 48 20 133 7 53 -23 43 13
134 15 58 -25 1 40 14 19 9 33 112 -76 134 45 58 -25 12 35 133 45 40 -24 50 29 135 43 56 -25 33 20 132 45 20 -24 27 50
133 52 34 -25 46 3 14 19 21 33 112 -75 134 22 43 -25 57 2 133 22 6 -25 34 48 135 21 0 -26 17 55 132 21 28 -25 12 0
133 27 51 -26 29 59 14 19 32 33 111 -74 133 58 11 -26 41 4 132 57 12 -26 18 40 134 56 48 -27 2 6 131 56 13 -25 55 42
133 1 46 -27 13 30 14 19 43 33 111 -74 133 32 18 -27 24 41 132 30 56 -27 2 4 134 31 18 -27 45 53 131 29 34 -26 38 55
132 34 18 -27 56 34 14 19 55 33 110 -73 133 5 2 -28 7 51 132 3 15 -27 45 2 134 4 26 -28 29 16 131 1 28 -27 21 40
132 5 23 -28 39 12 14 20 6 33 110 -72 132 36 21 -28 50 36 131 34 7 -28 27 33 133 36 12 -29 12 14 130 31 53 -28 3 55
131 35 0 -29 21 22 14 20 18 33 110 -71 132 6 12 -29 32 54 131 3 29 -29 9 35 133 6 31 -29 54 47 130 0 45 -28 45 41
131 3 4 -30 3 4 14 20 29 33 110 -70 131 34 32 -30 14 45 130 31 18 -29 51 8 132 35 21 -30 36 54 129 28 3 -29 26 57
130 29 34 -30 44 18 14 20 40 32 109 -70 131 1 18 -30 56 8 129 57 30 -30 32 12 132 2 38 -31 18 35 128 53 41 -30 7 41
129 54 24 -31 25 1 14 20 52 32 109 -69 130 26 26 -31 37 2 129 22 2 -31 12 45 131 28 20 -31 59 48 128 17 38 -30 47 52
129 17 31 -32 5 14 14 21 3 32 109 -68 129 49 52 -32 17 26 128 44 50 -31 52 46 130 52 22 -32 40 33 127 39 47 -31 27 30
128 38 51 -32 44 55 14 21 15 32 109 -67 129 11 32 -32 57 18 128 5 50 -32 32 15 130 14 41 -33 20 49 127 0 6 -32 6 32
127 58 19 -33 24 2 14 21 26 31 109 -66 128 31 21 -33 36 38 127 24 57 -33 11 8 129 35 11 -34 0 33 126 18 28 -32 44 58
127 15 51 -34 2 33 14 21 38 31 109 -65 127 49 15 -34 15 24 126 42 5 -33 49 25 128 53 48 -34 39 46 125 34 50 -33 22 44
126 31 21 -34 40 27 14 21 49 31 108 -65 127 5 9 -34 53 34 125 57 11 -34 27 3 128 10 27 -35 18 24 124 49 6 -33 59 49
125 44 42 -35 17 42 14 22 0 30 108 -64 126 18 56 -35 31 5 125 10 6 -35 4 0 127 25 2 -35 56 27 124 1 8 -34 36 11
124 55 50 -35 54 14 14 22 12 30 108 -63 125 30 31 -36 7 55 124 20 47 -35 40 13 126 37 28 -36 33 51 123 10 52 -35 11 45
124 4 38 -36 30 1 14 22 23 30 108 -62 124 39 47 -36 44 2 123 29 5 -36 15 40 125 47 38 -37 10 34 122 18 9 -35 46 30
123 10 57 -37 5 0 14 22 35 29 108 -61 123 46 37 -37 19 22 122 34 52 -36 50 17 124 55 26 -37 46 33 121 22 52 -36 20 21
122 14 41 -37 39 7 14 22 46 29 109 -60 122 50 53 -37 53 52 121 38 2 -37 24 0 124 0 42 -38 21 46 120 24 52 -36 53 14
Uncertainty in time = +/- 8 secs
[Prediction of 2008 Mar 31.0]
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