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Updated: 2005 SEP 01, 04:57 UT
Event Rank : 61
(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 Sep 13 UT, the 59 km diameter asteroid (904) Rockefellia will occult a 10.0 mag star in the constellation Aquila for observers along a path across central Australia, with a possibility of an event in Darwin, Adelaide and Melbourne.
In the case of an occultation, the combined light of the asteroid and the star will drop by 5.1 mag to 15.1 mag (the magnitude of the asteroid) for at most 6.8 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
133 37 50 - 9 49 27 16 23 36 20 271 -69 134 24 19 - 9 52 57 132 52 58 - 9 45 52 136 5 6 - 9 59 52 131 25 52 - 9 38 25
133 20 37 -10 22 27 16 23 44 21 272 -69 134 6 42 -10 25 58 132 36 6 -10 18 51 135 46 29 -10 32 57 131 9 36 -10 11 21
133 4 22 -10 55 27 16 23 51 21 272 -69 133 50 7 -10 59 1 132 20 10 -10 51 51 135 29 1 -11 6 2 130 54 10 -10 44 18
132 49 3 -11 28 30 16 23 58 21 272 -69 133 34 31 -11 32 4 132 5 7 -11 24 52 135 12 40 -11 39 9 130 39 33 -11 17 17
132 34 40 -12 1 33 16 24 5 21 272 -69 133 19 52 -12 5 9 131 50 56 -11 57 54 134 57 22 -12 12 17 130 25 45 -11 50 17
132 21 9 -12 34 38 16 24 12 21 273 -69 133 6 9 -12 38 15 131 37 37 -12 30 58 134 43 6 -12 45 26 130 12 44 -12 23 19
132 8 31 -13 7 46 16 24 19 22 273 -69 132 53 20 -13 11 24 131 25 8 -13 4 4 134 29 51 -13 18 37 130 0 30 -12 56 23
131 56 44 -13 40 55 16 24 26 22 273 -69 132 41 25 -13 44 34 131 13 28 -13 37 13 134 17 35 -13 51 50 129 49 1 -13 29 30
131 45 48 -14 14 7 16 24 34 22 273 -68 132 30 23 -14 17 47 131 2 36 -14 10 24 134 6 17 -14 25 5 129 38 18 -14 2 39
131 35 42 -14 47 22 16 24 41 22 274 -68 132 20 13 -14 51 3 130 52 33 -14 43 37 133 55 56 -14 58 22 129 28 19 -14 35 51
131 26 25 -15 20 39 16 24 48 22 274 -68 132 10 54 -15 24 21 130 43 17 -15 16 54 133 46 31 -15 31 42 129 19 4 -15 9 5
131 17 57 -15 53 59 16 24 55 22 274 -68 132 2 27 -15 57 42 130 34 49 -15 50 13 133 38 2 -16 5 6 129 10 34 -15 42 23
131 10 18 -16 27 23 16 25 2 22 274 -68 131 54 50 -16 31 7 130 27 8 -16 23 36 133 30 29 -16 38 32 129 2 47 -16 15 45
131 3 29 -17 0 51 16 25 9 22 275 -68 131 48 4 -17 4 35 130 20 14 -16 57 3 133 23 51 -17 12 2 128 55 45 -16 49 10
130 57 28 -17 34 22 16 25 16 22 275 -67 131 42 10 -17 38 7 130 14 8 -17 30 33 133 18 8 -17 45 36 128 49 27 -17 22 39
130 52 17 -18 7 57 16 25 24 22 275 -67 131 37 6 -18 11 43 130 8 49 -18 4 8 133 13 22 -18 19 13 128 43 53 -17 56 12
130 47 55 -18 41 37 16 25 31 22 275 -67 131 32 54 -18 45 23 130 4 18 -18 37 47 133 9 32 -18 52 55 128 39 3 -18 29 49
130 44 23 -19 15 21 16 25 38 22 276 -66 131 29 35 -19 19 8 130 0 35 -19 11 30 133 6 39 -19 26 40 128 34 59 -19 3 31
130 41 43 -19 49 10 16 25 45 22 276 -66 131 27 8 -19 52 57 129 57 41 -19 45 18 133 4 43 -20 0 31 128 31 41 -19 37 18
130 39 54 -20 23 3 16 25 52 22 276 -66 131 25 35 -20 26 52 129 55 37 -20 19 12 133 3 46 -20 34 26 128 29 8 -20 11 10
130 38 57 -20 57 2 16 25 59 22 276 -65 131 24 57 -21 0 51 129 54 23 -20 53 10 133 3 49 -21 8 27 128 27 23 -20 45 7
130 38 55 -21 31 7 16 26 6 22 277 -65 131 25 14 -21 34 56 129 54 2 -21 27 14 133 4 53 -21 42 32 128 26 26 -21 19 10
130 39 47 -22 5 17 16 26 13 22 277 -64 131 26 29 -22 9 6 129 54 33 -22 1 23 133 7 1 -22 16 43 128 26 18 -21 53 18
130 41 36 -22 39 32 16 26 21 22 277 -64 131 28 43 -22 43 23 129 55 58 -22 35 39 133 10 13 -22 51 0 128 27 0 -22 27 32
130 44 23 -23 13 55 16 26 28 22 277 -64 131 31 58 -23 17 45 129 58 19 -23 10 0 133 14 32 -23 25 23 128 28 33 -23 1 53
130 48 10 -23 48 23 16 26 35 21 277 -63 131 36 16 -23 52 14 130 1 38 -23 44 28 133 20 1 -23 59 52 128 31 0 -23 36 20
130 52 59 -24 22 58 16 26 42 21 277 -63 131 41 38 -24 26 49 130 5 56 -24 19 3 133 26 42 -24 34 27 128 34 21 -24 10 54
130 58 52 -24 57 40 16 26 49 21 278 -62 131 48 9 -25 1 31 130 11 16 -24 53 45 133 34 39 -25 9 9 128 38 40 -24 45 35
131 5 53 -25 32 29 16 26 56 21 278 -62 131 55 50 -25 36 20 130 17 40 -25 28 34 133 43 56 -25 43 57 128 43 56 -25 20 23
131 14 5 -26 7 25 16 27 3 21 278 -61 132 4 45 -26 11 16 130 25 11 -26 3 30 133 54 36 -26 18 53 128 50 14 -25 55 19
131 23 29 -26 42 29 16 27 11 20 278 -60 132 14 58 -26 46 20 130 33 52 -26 38 34 134 6 43 -26 53 56 128 57 36 -26 30 23
131 34 12 -27 17 41 16 27 18 20 278 -60 132 26 33 -27 21 32 130 43 46 -27 13 46 134 20 25 -27 29 6 129 6 4 -27 5 34
131 46 16 -27 53 1 16 27 25 20 278 -59 132 39 35 -27 56 51 130 54 57 -27 49 6 134 35 46 -28 4 24 129 15 42 -27 40 54
131 59 46 -28 28 29 16 27 32 19 278 -59 132 54 8 -28 32 18 131 7 31 -28 24 34 134 52 53 -28 39 49 129 26 34 -28 16 23
132 14 48 -29 4 5 16 27 39 19 278 -58 133 10 20 -29 7 54 131 21 30 -29 0 11 135 11 55 -29 15 23 129 38 42 -28 52 0
132 31 29 -29 39 51 16 27 46 19 278 -58 133 28 17 -29 43 39 131 37 2 -29 35 57 135 33 2 -29 51 4 129 52 13 -29 27 46
132 49 54 -30 15 45 16 27 53 18 278 -57 133 48 7 -30 19 32 131 54 12 -30 11 52 135 56 23 -30 26 53 130 7 11 -30 3 42
133 10 12 -30 51 48 16 28 1 18 278 -56 134 10 0 -30 55 33 132 13 7 -30 47 56 136 22 13 -31 2 50 130 23 41 -30 39 48
133 32 33 -31 28 0 16 28 8 18 278 -56 134 34 5 -31 31 44 132 33 56 -31 24 10 136 50 47 -31 38 55 130 41 50 -31 16 3
133 57 8 -32 4 22 16 28 15 17 278 -55 135 0 37 -32 8 3 132 56 47 -32 0 33 137 22 23 -32 15 7 131 1 45 -31 52 29
134 24 8 -32 40 53 16 28 22 17 278 -54 135 29 49 -32 44 32 133 21 52 -32 37 7 137 57 25 -32 51 27 131 23 36 -32 29 5
134 53 48 -33 17 34 16 28 29 16 278 -53 136 2 1 -33 21 9 133 49 24 -33 13 49 138 36 22 -33 27 53 131 47 30 -33 5 51
135 26 28 -33 54 23 16 28 36 16 278 -53 136 37 33 -33 57 55 134 19 37 -33 50 42 139 19 52 -34 4 26 132 13 40 -33 42 48
136 2 28 -34 31 22 16 28 43 15 278 -52 137 16 53 -34 34 48 134 52 49 -34 27 45 140 8 44 -34 41 3 132 42 18 -34 19 56
136 42 16 -35 8 30 16 28 50 14 278 -51 138 0 36 -35 11 49 135 29 22 -35 4 57 141 4 6 -35 17 43 133 13 40 -34 57 14
137 26 25 -35 45 45 16 28 58 14 277 -50 138 49 27 -35 48 57 136 9 43 -35 42 19 142 7 37 -35 54 23 133 48 3 -35 34 44
138 15 39 -36 23 8 16 29 5 13 277 -49 139 44 25 -36 26 9 136 54 26 -36 19 49 143 21 51 -36 30 57 134 25 50 -36 12 24
139 10 58 -37 0 36 16 29 12 12 276 -48 140 46 56 -37 3 24 137 44 15 -36 57 27 144 51 15 -37 7 17 135 7 28 -36 50 15
140 13 42 -37 38 8 16 29 19 11 276 -47 141 59 7 -37 40 37 138 40 5 -37 35 11 146 45 5 -37 43 1 135 53 31 -37 28 15
141 25 52 -38 15 39 16 29 26 10 275 -46 143 24 22 -38 17 42 139 43 19 -38 12 59 149 31 57 -38 17 6 136 44 41 -38 6 25
142 50 40 -38 53 3 16 29 33 9 274 -45 145 9 4 -38 54 24 140 55 52 -38 50 49 ... .. .. .. .. .. 137 41 56 -38 44 42
144 33 52 -39 30 8 16 29 40 7 273 -43 147 28 18 -39 30 11 142 20 47 -39 28 32 ... .. .. .. .. .. 138 46 34 -39 23 5
146 48 21 -40 6 26 16 29 48 6 272 -42 151 36 40 -40 2 13 144 3 28 -40 5 59 ... .. .. .. .. .. 140 0 28 -40 1 30
150 23 58 -40 40 4 16 29 55 3 270 -39 ... .. .. .. .. .. 146 15 32 -40 42 43 ... .. .. .. .. .. 141 26 31 -40 39 52
... .. .. .. .. .. .. .. .. .. .. .. ... .. .. .. .. .. 149 36 18 -41 17 17 ... .. .. .. .. .. 143 9 41 -41 18 1
... .. .. .. .. .. .. .. .. .. .. .. ... .. .. .. .. .. ... .. .. .. .. .. ... .. .. .. .. .. 145 20 5 -41 55 34
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