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Updated: 2014 Mar 12, 00:05 UT
Event Rank : 65
(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 2014 Apr 30 UT, the 66 km diameter asteroid (1735) ITA will occult a 10.7 mag star in the constellation Corona Australis for observers along a path across Northern Territory, eastern South Australia, western Victoria and western Tasmania, passing over Horsham and Warrnambool.
In the case of an occultation, the combined light of the asteroid and the star will drop by 3.6 mag to 14.2 mag (the magnitude of the asteroid) for at most 7.3 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, 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.
Occultation of TYC 7924-00023-1 by 1735 ITA on 2014 Apr 30
Centre Star Star Sun Path Limits Error Limits
E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' "
Longitude Longitude Longitude Longitude
132 59 29 -10 0 0 17 29 0 49 147 -55 132 39 57 133 18 59 132 3 59 133 54 48
133 19 43 -11 0 0 17 29 11 50 146 -54 133 0 9 133 39 16 132 24 7 134 15 10
133 39 51 -12 0 0 17 29 21 51 146 -54 133 20 14 133 59 26 132 44 6 134 35 26
133 59 52 -13 0 0 17 29 31 52 146 -54 133 40 12 134 19 31 133 3 59 134 55 37
134 19 48 -14 0 0 17 29 42 53 145 -54 134 0 5 134 39 31 133 23 44 135 15 45
134 39 40 -15 0 0 17 29 53 54 145 -53 134 19 53 134 59 27 133 43 24 135 35 49
134 59 29 -16 0 0 17 30 3 55 144 -53 134 39 37 135 19 21 134 3 0 135 55 51
135 19 15 -17 0 0 17 30 14 56 144 -53 134 59 18 135 39 12 134 22 32 136 15 52
135 39 0 -18 0 0 17 30 26 57 143 -53 135 18 57 135 59 3 134 42 0 136 35 53
135 58 45 -19 0 0 17 30 37 58 143 -52 135 38 35 136 18 53 135 1 27 136 55 55
136 18 29 -20 0 0 17 30 48 59 142 -52 135 58 13 136 38 45 135 20 54 137 15 59
136 38 16 -21 0 0 17 31 0 60 141 -51 136 17 53 136 58 38 135 40 20 137 36 6
136 58 5 -22 0 0 17 31 11 61 140 -51 136 37 34 137 18 35 135 59 47 137 56 17
137 17 57 -23 0 0 17 31 23 62 140 -51 136 57 18 137 38 35 136 19 16 138 16 33
137 37 54 -24 0 0 17 31 35 63 139 -50 137 17 6 137 58 41 136 38 48 138 36 55
137 57 57 -25 0 0 17 31 47 64 138 -50 137 37 0 138 18 54 136 58 25 138 57 25
138 18 6 -26 0 0 17 31 59 65 137 -49 137 56 59 138 39 13 137 18 6 139 18 3
138 38 24 -27 0 0 17 32 11 66 136 -49 138 17 6 138 59 41 137 37 54 139 38 51
138 58 51 -28 0 0 17 32 23 67 134 -48 138 37 22 139 20 20 137 57 49 139 59 50
139 19 29 -29 0 0 17 32 35 68 133 -48 138 57 48 139 41 9 138 17 53 140 21 2
139 40 18 -30 0 0 17 32 47 69 132 -47 139 18 25 140 2 12 138 38 7 140 42 27
140 1 21 -31 0 0 17 33 0 69 130 -47 139 39 14 140 23 28 138 58 32 141 4 8
140 22 39 -32 0 0 17 33 12 70 128 -46 140 0 18 140 45 0 139 19 10 141 26 6
140 44 13 -33 0 0 17 33 25 71 126 -46 140 21 37 141 6 49 139 40 2 141 48 23
141 6 5 -34 0 0 17 33 38 72 124 -45 140 43 14 141 28 57 140 1 10 142 11 0
141 28 17 -35 0 0 17 33 50 73 122 -45 141 5 9 141 51 25 140 22 34 142 34 0
141 50 50 -36 0 0 17 34 3 74 119 -44 141 27 25 142 14 16 140 44 18 142 57 24
142 13 47 -37 0 0 17 34 16 74 117 -43 141 50 3 142 37 32 141 6 23 143 21 14
142 37 10 -38 0 0 17 34 29 75 114 -43 142 13 6 143 1 14 141 28 50 143 45 32
143 1 1 -39 0 0 17 34 42 76 110 -42 142 36 36 143 25 26 141 51 42 144 10 22
143 25 22 -40 0 0 17 34 55 76 106 -41 143 0 35 143 50 8 142 15 1 144 35 46
143 50 15 -41 0 0 17 35 8 77 102 -41 143 25 6 144 15 25 142 38 50 145 1 45
144 15 45 -42 0 0 17 35 21 78 98 -40 143 50 11 144 41 19 143 3 10 145 28 25
144 41 53 -43 0 0 17 35 34 78 93 -40 144 15 53 145 7 53 143 28 6 145 55 47
145 8 42 -44 0 0 17 35 47 78 88 -39 144 42 16 145 35 10 143 53 38 146 23 55
145 36 18 -45 0 0 17 36 0 79 82 -38 145 9 22 146 3 14 144 19 52 146 52 53
Uncertainty in time = +/- 7 secs
Prediction of 2014 Mar 12.0
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