|
|
Updated: 2018 AUG 12, 17:17 UT
Event Rank : 96
(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 09 UT, the 76.2 km diameter asteroid (795) Fini will occult a 12.5 mag star in the constellation Scorpius for observers along a path across Australia across central South Australia, south-eastern Northern Territory and northern Queensland near Cooktown at low elevation.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.66 mag to 15.03 mag (the magnitude of the asteroid) for at most 4.9 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 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
127 43 3 -42 44 22 14 50 2 39 240 -52 127 3 43 -42 47 43 128 22 40 -42 40 39 126 37 8 -42 49 47 128 49 46 -42 37 54 0.87
128 0 15 -41 59 8 14 50 7 39 239 -52 127 21 11 -42 2 41 128 39 37 -41 55 12 126 54 47 -42 4 53 129 6 33 -41 52 18 0.87
128 17 58 -41 13 25 14 50 12 38 239 -53 127 39 8 -41 17 11 128 57 5 -41 9 16 127 12 53 -41 19 31 129 23 52 -41 6 13 0.87
128 36 12 -40 27 12 14 50 16 37 238 -54 127 57 34 -40 31 12 129 15 7 -40 22 49 127 31 28 -40 33 41 129 41 45 -40 19 36 0.87
128 54 59 -39 40 27 14 50 21 37 238 -55 128 16 33 -39 44 41 129 33 43 -39 35 49 127 50 34 -39 47 20 130 0 14 -39 32 26 0.87
129 14 21 -38 53 8 14 50 26 36 237 -56 128 36 4 -38 57 37 129 52 55 -38 48 14 128 10 13 -39 0 27 130 19 20 -38 44 40 0.87
129 34 19 -38 5 12 14 50 30 36 236 -57 128 56 11 -38 9 57 130 12 46 -38 0 1 128 30 26 -38 12 58 130 39 6 -37 56 15 0.87
129 54 57 -37 16 36 14 50 35 35 236 -57 129 16 55 -37 21 39 130 33 17 -37 11 8 128 51 15 -37 24 51 130 59 33 -37 7 9 0.87
130 16 15 -36 27 18 14 50 40 34 235 -58 129 38 19 -36 32 40 130 54 31 -36 21 31 129 12 42 -36 36 4 131 20 45 -36 17 18 0.87
130 38 18 -35 37 15 14 50 44 33 235 -59 130 0 25 -35 42 56 131 16 32 -35 31 6 129 34 51 -35 46 33 131 42 43 -35 26 39 0.87
131 1 8 -34 46 22 14 50 49 33 234 -60 130 23 17 -34 52 25 131 39 21 -34 39 51 129 57 44 -34 56 16 132 5 33 -34 35 8 0.88
131 24 49 -33 54 35 14 50 54 32 234 -61 130 46 57 -34 1 1 132 3 3 -33 47 40 130 21 24 -34 5 8 132 29 17 -33 42 40 0.88
131 49 24 -33 1 50 14 50 58 31 233 -62 131 11 30 -33 8 42 132 27 43 -32 54 29 130 45 56 -33 13 5 132 53 59 -32 49 10 0.88
132 14 59 -32 8 2 14 51 3 30 233 -63 131 36 59 -32 15 21 132 53 24 -32 0 11 131 11 22 -32 20 1 133 19 46 -31 54 33 0.88
132 41 39 -31 13 4 14 51 8 29 232 -64 132 3 31 -31 20 52 133 20 14 -31 4 42 131 37 49 -31 25 53 133 46 43 -30 58 41 0.88
133 9 31 -30 16 49 14 51 12 28 231 -65 132 31 11 -30 25 10 133 48 18 -30 7 52 132 5 22 -30 30 33 134 14 58 -30 1 26 0.88
133 38 41 -29 19 9 14 51 17 27 231 -66 133 0 5 -29 28 7 134 17 45 -29 9 33 132 34 7 -29 33 53 134 44 38 -29 2 39 0.88
134 9 18 -28 19 54 14 51 22 27 230 -67 133 30 23 -28 29 33 134 48 45 -28 9 34 133 4 13 -28 35 45 135 15 54 -28 2 9 0.89
134 41 34 -27 18 52 14 51 26 25 230 -68 134 2 14 -27 29 17 135 21 29 -27 7 43 133 35 48 -27 35 59 135 48 58 -26 59 43 0.89
135 15 41 -26 15 49 14 51 31 24 230 -69 134 35 50 -26 27 7 135 56 11 -26 3 44 134 9 5 -26 34 22 136 24 6 -25 55 3 0.89
135 51 56 -25 10 28 14 51 36 23 229 -70 135 11 27 -25 22 46 136 33 9 -24 57 18 134 44 17 -25 30 40 137 1 37 -24 47 49 0.89
136 30 40 -24 2 25 14 51 40 22 229 -71 135 49 22 -24 15 54 137 12 47 -23 47 59 135 21 42 -24 24 32 137 41 55 -23 37 34 0.90
137 12 19 -22 51 13 14 51 45 21 228 -72 136 29 59 -23 6 5 137 55 34 -22 35 15 136 1 42 -23 15 36 138 25 35 -22 23 43 0.90
137 57 29 -21 36 14 14 51 50 19 228 -74 137 13 51 -21 52 46 138 42 13 -21 18 23 136 44 46 -22 3 21 139 13 21 -21 5 26 0.91
138 47 0 -20 16 33 14 51 54 18 227 -75 138 1 40 -20 35 11 139 33 42 -19 56 20 137 31 33 -20 47 4 140 6 20 -19 41 36 0.91
139 42 5 -18 50 54 14 51 59 16 227 -76 138 54 28 -19 12 15 140 31 28 -18 27 34 138 22 58 -19 25 47 141 6 12 -18 10 24 0.92
140 44 39 -17 17 17 14 52 4 15 226 -77 139 53 48 -17 42 20 141 37 55 -16 49 33 139 20 24 -17 58 3 142 15 48 -16 28 53 0.94
141 58 0 -15 32 14 14 52 8 12 226 -78 141 2 14 -16 2 44 142 57 29 -14 57 42 140 26 2 -16 21 35 143 40 39 -14 31 18 0.96
143 28 52 -13 28 44 14 52 13 10 225 -79 142 24 35 -14 8 26 144 40 16 -12 41 28 141 43 49 -14 32 17 145 34 50 -12 2 59 1.00
145 36 40 -10 46 40 14 52 17 7 225 -79 144 12 19 -11 47 32 147 27 3 - 9 18 40 143 22 18 -12 21 12 149 46 41 - 7 12 4 1.12
.. .. .. .. .. .. .. .. .. .. .. .. 147 19 0 - 8 4 40 ... .. .. .. .. .. 145 50 45 - 9 18 7 ... .. .. .. .. .. ....
Uncertainty in time = +/- 3 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]