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Updated: 2017 Feb 27, 00:42 UT
Event Rank : 57
(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 2017 Apr 11 UT, the 32 km diameter asteroid (340) Eduarda will occult a 10.9 mag star in the constellation Leo for observers along a somewhat uncertain path across western Queensland, passing near Cloncurry and across north-eastern New South Wales, passing over Sydney.
In the case of an occultation, the combined light of the asteroid and the star will drop by 3.74 mag to 14.60 mag (the magnitude of the asteroid) for at most 9.6 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.
Occultation of TYC 1413-00130-1 by 340 Eduarda on 2017 Apr 11
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
136 16 30 -11 17 21 13 39 30 45 310 -71 136 26 17 -11 15 46 136 6 45 -11 18 58 136 47 16 -11 12 24 135 45 57 -11 22 26 -0.49
136 56 6 -12 53 48 13 40 14 43 311 -72 137 6 0 -12 52 15 136 46 13 -12 55 22 137 27 16 -12 48 57 136 25 8 -12 58 47 -0.49
137 39 18 -14 32 32 13 40 58 41 311 -72 137 49 21 -14 31 1 137 29 16 -14 34 4 138 10 57 -14 27 49 137 7 52 -14 37 23 -0.49
138 26 40 -16 13 52 13 41 42 40 311 -72 138 36 54 -16 12 23 138 16 27 -16 15 21 138 58 54 -16 9 17 137 54 41 -16 18 35 -0.50
139 18 56 -17 58 9 13 42 27 38 312 -72 139 29 24 -17 56 44 139 8 31 -17 59 35 139 51 52 -17 53 46 138 46 17 -18 2 42 -0.50
140 17 2 -19 45 53 13 43 11 36 312 -72 140 27 45 -19 44 32 140 6 21 -19 47 15 140 50 47 -19 41 43 139 43 35 -19 50 14 -0.50
141 22 10 -21 37 38 13 43 55 34 312 -72 141 33 12 -21 36 22 141 11 10 -21 38 55 141 56 56 -21 33 44 140 47 44 -21 41 44 -0.51
142 35 59 -23 34 11 13 44 39 31 311 -71 142 47 25 -23 33 2 142 24 36 -23 35 22 143 12 1 -23 30 38 142 0 21 -23 37 58 -0.51
144 0 49 -25 36 35 13 45 23 29 311 -71 144 12 46 -25 35 34 143 48 56 -25 37 38 144 38 29 -25 33 29 143 23 39 -25 39 56 -0.51
145 40 8 -27 46 20 13 46 8 26 311 -69 145 52 45 -27 45 31 145 27 34 -27 47 11 146 19 57 -27 43 52 145 0 54 -27 49 5 -0.51
147 39 23 -30 5 44 13 46 52 23 310 -68 147 52 57 -30 5 12 147 25 54 -30 6 18 148 22 16 -30 4 13 146 57 18 -30 7 37 -0.52
150 8 16 -32 38 40 13 47 36 20 309 -66 150 23 19 -32 38 37 149 53 21 -32 38 47 150 55 56 -32 38 41 149 21 47 -32 39 11 -0.53
153 27 1 -35 32 59 13 48 20 16 307 -63 153 44 46 -35 33 50 153 9 28 -35 32 13 154 23 32 -35 35 56 152 32 37 -35 30 53 -0.55
Uncertainty in time = +/- 10 secs
Prediction of 2017 Feb 27.0
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
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