|
|
Updated: 2018 AUG 12, 17:23 UT
Event Rank : 99
(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 11 UT, the 117 km diameter asteroid (105) Artemis will occult a 12.2 mag star in the constellation Pisces for observers along a narrow path across Western Australia from Port Headland (and possibly Broome) to Geraldton.
In the case of an occultation, the combined light of the asteroid and the star will drop by 0.89 mag to 12.45 mag (the magnitude of the asteroid) for at most 9.9 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 Limits Error Limits Alt
E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' "
Longitude Longitude Longitude Longitude
111 33 11 -35 0 0 19 18 32 46 342 -41 110 43 42 112 22 52 110 25 14 112 41 32 0.63
112 4 12 -34 0 0 19 18 24 46 341 -41 111 15 11 112 53 27 110 56 53 113 11 58 0.63
112 35 31 -33 0 0 19 18 15 47 340 -41 111 46 54 113 24 21 111 28 45 113 42 42 0.63
113 7 6 -32 0 0 19 18 6 48 339 -41 112 18 53 113 55 34 112 0 52 114 13 46 0.63
113 39 0 -31 0 0 19 17 57 49 338 -41 112 51 8 114 27 6 112 33 16 114 45 11 0.63
114 11 13 -30 0 0 19 17 48 50 337 -41 113 23 41 114 58 59 113 5 56 115 16 57 0.63
114 43 46 -29 0 0 19 17 39 50 336 -41 113 56 32 115 31 15 113 38 55 115 49 5 0.63
115 16 41 -28 0 0 19 17 30 51 335 -41 114 29 44 116 3 53 114 12 12 116 21 37 0.63
115 49 58 -27 0 0 19 17 20 52 333 -41 115 3 15 116 36 55 114 45 50 116 54 34 0.63
116 23 38 -26 0 0 19 17 10 52 332 -41 115 37 9 117 10 21 115 19 49 117 27 56 0.63
116 57 42 -25 0 0 19 17 1 53 330 -40 116 11 26 117 44 14 115 54 10 118 1 44 0.63
117 32 12 -24 0 0 19 16 51 54 329 -40 116 46 7 118 18 34 116 28 55 118 36 0 0.63
118 7 9 -23 0 0 19 16 41 54 327 -40 117 21 13 118 53 22 117 4 5 119 10 44 0.63
118 42 34 -22 0 0 19 16 31 55 326 -40 117 56 46 119 28 39 117 39 40 119 45 59 0.63
119 18 28 -21 0 0 19 16 21 55 324 -39 118 32 46 120 4 27 118 15 43 120 21 45 0.63
119 54 53 -20 0 0 19 16 10 56 323 -39 119 9 16 120 40 47 118 52 15 120 58 3 0.63
120 31 50 -19 0 0 19 16 0 56 321 -39 119 46 16 121 17 41 119 29 17 121 34 56 0.62
121 9 20 -18 0 0 19 15 49 57 319 -38 120 23 49 121 55 10 120 6 50 122 12 24 0.62
121 47 26 -17 0 0 19 15 39 57 317 -38 121 1 55 122 33 15 120 44 56 122 50 29 0.62
122 26 8 -16 0 0 19 15 28 57 315 -38 121 40 36 123 11 58 121 23 37 123 29 13 0.62
123 5 28 -15 0 0 19 15 17 58 313 -37 122 19 54 123 51 22 122 2 55 124 8 38 0.62
123 45 29 -14 0 0 19 15 6 58 312 -37 122 59 51 124 31 27 122 42 50 124 48 45 0.62
124 26 12 -13 0 0 19 14 55 58 310 -36 123 40 28 125 12 16 123 23 26 125 29 36 0.62
125 7 39 -12 0 0 19 14 44 58 307 -35 124 21 48 125 53 51 124 4 43 126 11 14 0.62
125 49 53 -11 0 0 19 14 33 58 305 -35 125 3 53 126 36 14 124 46 45 126 53 41 0.62
126 32 55 -10 0 0 19 14 22 58 303 -34 125 46 45 127 19 27 125 29 33 127 36 59 0.62
127 16 49 - 9 0 0 19 14 10 58 301 -34 126 30 26 128 3 34 126 13 10 128 21 11 0.62
128 1 36 - 8 0 0 19 13 59 58 299 -33 127 15 0 128 48 37 126 57 38 129 6 20 0.62
128 47 21 - 7 0 0 19 13 47 58 297 -32 128 0 28 129 34 39 127 43 1 129 52 28 0.62
129 34 5 - 6 0 0 19 13 36 58 295 -31 128 46 54 130 21 42 128 29 20 130 39 39 0.62
130 21 53 - 5 0 0 19 13 24 57 293 -31 129 34 21 131 9 52 129 16 40 131 27 57 0.62
131 10 47 - 4 0 0 19 13 12 57 291 -30 130 22 53 131 59 10 130 5 3 132 17 25 0.61
132 0 53 - 3 0 0 19 13 1 57 289 -29 131 12 33 132 49 42 130 54 34 133 8 8 0.61
132 52 13 - 2 0 0 19 12 49 56 288 -28 132 3 25 133 41 33 131 45 16 134 0 9 0.61
133 44 53 - 1 0 0 19 12 37 56 286 -27 132 55 34 134 34 46 132 37 14 134 53 35 0.61
134 38 59 0 0 0 19 12 25 55 284 -26 133 49 5 135 29 27 133 30 33 135 48 30 0.61
135 34 34 1 0 0 19 12 13 55 282 -25 134 44 3 136 25 42 134 25 17 136 45 1 0.61
Latitude Latitude Latitude Latitude
136 0 0 1 26 53 19 12 7 54 282 -25 2 20 14 0 32 48 2 40 2 0 12 21 0.61
137 0 0 2 28 58 19 11 55 54 280 -24 3 21 29 1 35 44 3 40 58 1 15 37 0.61
Uncertainty in time = +/- 2 secs
Prediction of 2018 Aug 12.0
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
[Timing Details]
[Reporting Details]
[Report Form]
[Asteroid Occultation Results]
[Top of Page][Return to Home Page]