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Updated: 2018 AUG 12, 17:12 UT
Event Rank : 72
(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 2018 Sep 06 UT, the 41.3 km diameter asteroid (542) Susanna will occult a 11.3 mag star in the constellation Pisces for observers along a path across Australia from Esperence across eastern Western Australia and The Northern Territory to Gove Peninsula.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.76 mag to 12.85 mag (the magnitude of the asteroid) for at most 4.2 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, astrometry for the asteroid kindly provided by Bill Owen, astrometry for the asteroid kindly provided by the IAU Minor Planet Center.
This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement.
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 Alt
E. Longitude Latitude U.T. Alt Az Alt Crn
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' "
Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude
147 1 12 - 2 44 9 19 21 6 33 265 -12 147 18 9 - 2 49 29 146 44 24 - 2 38 48 147 40 32 - 2 56 26 146 22 39 - 2 31 47 0.86
146 20 3 - 3 18 7 19 21 13 33 265 -13 146 36 47 - 3 23 29 146 3 27 - 3 12 45 146 58 52 - 3 30 28 145 41 57 - 3 5 42 0.86
145 40 0 - 3 51 58 19 21 20 34 266 -14 145 56 32 - 3 57 21 145 23 35 - 3 46 34 146 18 23 - 4 4 22 145 2 19 - 3 39 28 0.86
145 1 0 - 4 25 41 19 21 27 35 266 -15 145 17 22 - 4 31 6 144 44 45 - 4 20 16 145 38 58 - 4 38 9 144 23 42 - 4 13 9 0.86
144 22 58 - 4 59 19 19 21 35 35 266 -15 144 39 11 - 5 4 45 144 6 53 - 4 53 52 145 0 34 - 5 11 51 143 46 2 - 4 46 43 0.87
143 45 52 - 5 32 51 19 21 42 36 267 -16 144 1 55 - 5 38 19 143 29 55 - 5 27 23 144 23 7 - 5 45 26 143 9 15 - 5 20 12 0.87
143 9 37 - 6 6 18 19 21 49 37 267 -16 143 25 33 - 6 11 47 142 53 49 - 6 0 48 143 46 33 - 6 18 57 142 33 18 - 5 53 36 0.87
142 34 12 - 6 39 41 19 21 56 37 268 -17 142 50 0 - 6 45 11 142 18 30 - 6 34 9 143 10 50 - 6 52 22 141 58 9 - 6 26 55 0.87
141 59 32 - 7 12 59 19 22 4 38 268 -18 142 15 13 - 7 18 31 141 43 57 - 7 7 26 142 35 54 - 7 25 43 141 23 45 - 7 0 10 0.87
141 25 36 - 7 46 13 19 22 11 38 269 -18 141 41 11 - 7 51 46 141 10 8 - 7 40 39 142 1 44 - 7 59 1 140 50 3 - 7 33 22 0.87
140 52 22 - 8 19 24 19 22 18 39 269 -19 141 7 51 - 8 24 58 140 36 59 - 8 13 49 141 28 16 - 8 32 15 140 17 1 - 8 6 30 0.87
140 19 47 - 8 52 32 19 22 25 39 270 -19 140 35 11 - 8 58 8 140 4 29 - 8 46 56 140 55 29 - 9 5 26 139 44 38 - 8 39 35 0.87
139 47 49 - 9 25 37 19 22 33 40 270 -20 140 3 9 - 9 31 14 139 32 36 - 9 20 0 140 23 20 - 9 38 34 139 12 51 - 9 12 37 0.87
139 16 28 - 9 58 40 19 22 40 40 271 -20 139 31 42 -10 4 18 139 1 19 - 9 53 1 139 51 48 -10 11 40 138 41 38 - 9 45 37 0.87
138 45 40 -10 31 41 19 22 47 41 271 -21 139 0 51 -10 37 20 138 30 35 -10 26 1 139 20 51 -10 44 43 138 10 59 -10 18 35 0.87
138 15 25 -11 4 40 19 22 54 41 272 -21 138 30 32 -11 10 21 138 0 23 -10 58 59 138 50 27 -11 17 45 137 40 52 -10 51 32 0.87
137 45 40 -11 37 38 19 23 1 42 273 -22 138 0 44 -11 43 20 137 30 42 -11 31 55 138 20 35 -11 50 46 137 11 15 -11 24 27 0.87
137 16 26 -12 10 35 19 23 9 42 273 -22 137 31 27 -12 16 18 137 1 30 -12 4 51 137 51 14 -12 23 46 136 42 7 -11 57 20 0.87
136 47 40 -12 43 31 19 23 16 43 274 -23 137 2 38 -12 49 15 136 32 47 -12 37 46 137 22 22 -12 56 45 136 13 27 -12 30 14 0.87
136 19 21 -13 16 26 19 23 23 43 274 -23 136 34 17 -13 22 12 136 4 30 -13 10 40 136 53 58 -13 29 43 135 45 13 -13 3 6 0.87
135 51 29 -13 49 21 19 23 30 43 275 -24 136 6 23 -13 55 8 135 36 40 -13 43 34 136 26 1 -14 2 41 135 17 25 -13 35 58 0.88
135 24 1 -14 22 16 19 23 38 44 276 -24 135 38 54 -14 28 5 135 9 14 -14 16 28 135 58 29 -14 35 39 134 50 1 -14 8 51 0.88
134 56 58 -14 55 12 19 23 45 44 276 -24 135 11 49 -15 1 1 134 42 12 -14 49 22 135 31 23 -15 8 38 134 23 2 -14 41 43 0.88
134 30 18 -15 28 8 19 23 52 44 277 -25 134 45 8 -15 33 59 134 15 34 -15 22 17 135 4 40 -15 41 37 133 56 24 -15 14 37 0.88
134 4 1 -16 1 5 19 23 59 45 278 -25 134 18 50 -16 6 57 133 49 17 -15 55 12 134 38 20 -16 14 37 133 30 9 -15 47 31 0.88
133 38 5 -16 34 3 19 24 7 45 278 -26 133 52 53 -16 39 57 133 23 22 -16 28 9 134 12 23 -16 47 38 133 4 15 -16 20 26 0.88
133 12 30 -17 7 3 19 24 14 45 279 -26 133 27 18 -17 12 57 132 57 48 -17 1 7 133 46 47 -17 20 41 132 38 41 -16 53 22 0.88
132 47 15 -17 40 4 19 24 21 46 280 -26 133 2 3 -17 46 0 132 32 33 -17 34 7 133 21 31 -17 53 45 132 13 27 -17 26 20 0.88
132 22 20 -18 13 7 19 24 28 46 281 -27 132 37 8 -18 19 4 132 7 38 -18 7 9 132 56 36 -18 26 51 131 48 31 -17 59 20 0.88
131 57 44 -18 46 12 19 24 36 46 281 -27 132 12 31 -18 52 11 131 43 1 -18 40 12 132 32 0 -19 0 0 131 23 54 -18 32 22 0.88
131 33 25 -19 19 19 19 24 43 46 282 -27 131 48 13 -19 25 20 131 18 42 -19 13 18 132 7 42 -19 33 10 130 59 35 -19 5 26 0.88
131 9 24 -19 52 29 19 24 50 46 283 -28 131 24 13 -19 58 31 130 54 41 -19 46 27 131 43 43 -20 6 24 130 35 33 -19 38 33 0.88
130 45 40 -20 25 42 19 24 57 47 284 -28 131 0 30 -20 31 46 130 30 56 -20 19 38 131 20 1 -20 39 40 130 11 47 -20 11 42 0.88
130 22 13 -20 58 58 19 25 5 47 284 -28 130 37 4 -21 5 3 130 7 28 -20 52 53 130 56 36 -21 13 0 129 48 17 -20 44 55 0.89
129 59 2 -21 32 18 19 25 12 47 285 -29 130 13 53 -21 38 24 129 44 15 -21 26 11 130 33 27 -21 46 23 129 25 3 -21 18 11 0.89
129 36 6 -22 5 41 19 25 19 47 286 -29 129 50 59 -22 11 49 129 21 18 -21 59 33 130 10 35 -22 19 50 129 2 4 -21 51 30 0.89
129 13 25 -22 39 8 19 25 26 47 287 -29 129 28 20 -22 45 18 128 58 35 -22 32 58 129 47 58 -22 53 21 128 39 20 -22 24 54 0.89
128 50 59 -23 12 39 19 25 34 47 288 -29 129 5 55 -23 18 51 128 36 7 -23 6 28 129 25 36 -23 26 56 128 16 49 -22 58 21 0.89
128 28 47 -23 46 15 19 25 41 48 288 -30 128 43 46 -23 52 28 128 13 53 -23 40 2 129 3 29 -24 0 35 127 54 33 -23 31 53 0.89
128 6 49 -24 19 56 19 25 48 48 289 -30 128 21 50 -24 26 10 127 51 53 -24 13 41 128 41 36 -24 34 20 127 32 29 -24 5 30 0.89
127 45 4 -24 53 41 19 25 55 48 290 -30 128 0 7 -24 59 58 127 30 6 -24 47 24 128 19 56 -25 8 9 127 10 39 -24 39 11 0.89
127 23 32 -25 27 32 19 26 3 48 291 -30 127 38 38 -25 33 50 127 8 32 -25 21 13 127 58 31 -25 42 4 126 49 1 -25 12 58 0.89
127 2 13 -26 1 28 19 26 10 48 292 -31 127 17 22 -26 7 48 126 47 10 -25 55 8 127 37 19 -26 16 5 126 27 36 -25 46 50 0.89
126 41 7 -26 35 30 19 26 17 48 293 -31 126 56 19 -26 41 52 126 26 0 -26 29 8 127 16 19 -26 50 11 126 6 23 -26 20 48 0.89
126 20 12 -27 9 38 19 26 24 48 294 -31 126 35 28 -27 16 2 126 5 3 -27 3 14 126 55 33 -27 24 24 125 45 21 -26 54 51 0.90
125 59 30 -27 43 53 19 26 32 48 294 -31 126 14 48 -27 50 19 125 44 17 -27 37 27 126 34 58 -27 58 44 125 24 30 -27 29 2 0.90
125 38 59 -28 18 15 19 26 39 48 295 -31 125 54 21 -28 24 43 125 23 42 -28 11 46 126 14 36 -28 33 10 125 3 51 -28 3 18 0.90
125 18 39 -28 52 43 19 26 46 48 296 -31 125 34 5 -28 59 13 125 3 18 -28 46 13 125 54 25 -29 7 43 124 43 22 -28 37 42 0.90
124 58 30 -29 27 19 19 26 53 48 297 -32 125 14 1 -29 33 51 124 43 5 -29 20 47 125 34 26 -29 42 24 124 23 4 -29 12 13 0.90
124 38 33 -30 2 3 19 27 1 48 298 -32 124 54 8 -30 8 37 124 23 3 -29 55 28 125 14 39 -30 17 13 124 2 56 -29 46 52 0.90
124 18 45 -30 36 55 19 27 8 48 299 -32 124 34 25 -30 43 31 124 3 11 -30 30 18 124 55 3 -30 52 10 123 42 58 -30 21 39 0.90
123 59 8 -31 11 55 19 27 15 48 299 -32 124 14 53 -31 18 34 123 43 30 -31 5 16 124 35 37 -31 27 15 123 23 11 -30 56 33 0.90
123 39 42 -31 47 4 19 27 22 48 300 -32 123 55 32 -31 53 45 123 23 58 -31 40 22 124 16 23 -32 2 30 123 3 32 -31 31 37 0.90
123 20 25 -32 22 22 19 27 30 48 301 -32 123 36 20 -32 29 6 123 4 36 -32 15 38 123 57 19 -32 37 54 122 44 4 -32 6 49 0.90
123 1 19 -32 57 50 19 27 37 48 302 -32 123 17 20 -33 4 36 122 45 24 -32 51 3 123 38 26 -33 13 27 122 24 44 -32 42 11 0.90
122 42 22 -33 33 27 19 27 44 48 303 -32 122 58 29 -33 40 16 122 26 21 -33 26 38 123 19 43 -33 49 11 122 5 34 -33 17 43 0.90
122 23 34 -34 9 15 19 27 51 47 304 -32 122 39 48 -34 16 7 122 7 27 -34 2 23 123 1 10 -34 25 5 121 46 32 -33 53 25 0.91
122 4 57 -34 45 14 19 27 59 47 305 -32 122 21 17 -34 52 8 121 48 43 -34 38 19 122 42 48 -35 1 10 121 27 40 -34 29 17 0.91
121 46 28 -35 21 24 19 28 6 47 305 -32 122 2 55 -35 28 21 121 30 8 -35 14 26 122 24 36 -35 37 27 121 8 56 -35 5 20 0.91
121 28 9 -35 57 45 19 28 13 47 306 -33 121 44 43 -36 4 46 121 11 42 -35 50 45 122 6 34 -36 13 55 120 50 20 -35 41 35 0.91
121 10 0 -36 34 19 19 28 20 47 307 -33 121 26 41 -36 41 22 120 53 25 -36 27 16 121 48 42 -36 50 36 120 31 54 -36 18 2 0.91
120 51 59 -37 11 5 19 28 28 47 308 -33 121 8 49 -37 18 12 120 35 16 -37 3 59 121 31 0 -37 27 29 120 13 35 -36 54 41 0.91
120 34 8 -37 48 5 19 28 35 46 309 -33 120 51 6 -37 55 15 120 17 17 -37 40 55 121 13 28 -38 4 36 119 55 25 -37 31 34 0.91
120 16 26 -38 25 18 19 28 42 46 309 -33 120 33 33 -38 32 31 119 59 26 -38 18 5 120 56 7 -38 41 57 119 37 23 -38 8 39 0.91
.. .. .. .. .. .. .. .. .. .. .. .. ... .. .. .. .. .. ... .. .. .. .. .. ... .. .. .. .. .. -133 16 39 -83 10 22 ....
Uncertainty in time = +/- 4 secs
Prediction of 2018 Aug 12.0
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