|
|
Updated: 2013 SEP 14, 23:22 UT
Event Rank : 98
(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 2013 Nov 13 UT, the 150 km diameter asteroid (776) Berbericia will occult a 11.4 mag star in the constellation Gemini for observers along a south-to-north path across Australia beginning in South Australia near Port Lincoln and Adelaide, and passing near Alice Springs and Darwin.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.0 mag to 11.8 mag (the magnitude of the asteroid) for at most 20.3 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.
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
125 48 23 -48 0 0 14 49 12 1 51 -24 128 55 52 ... .. .. ... .. .. ... .. ..
127 25 50 -47 0 0 14 49 14 2 50 -25 130 18 16 124 8 22 ... .. .. ... .. ..
128 49 21 -46 0 0 14 49 16 4 49 -26 131 30 2 125 48 51 133 13 51 123 25 25
130 1 43 -45 0 0 14 49 19 5 48 -27 132 32 56 127 14 14 134 11 26 125 3 36
131 4 53 -44 0 0 14 49 23 6 47 -28 133 28 17 128 27 44 135 2 18 126 26 49
132 0 16 -43 0 0 14 49 27 7 47 -29 134 17 5 129 31 33 135 47 14 127 38 16
132 48 54 -42 0 0 14 49 32 9 46 -30 135 0 6 130 27 14 136 26 55 128 40 9
133 31 37 -41 0 0 14 49 38 10 46 -31 135 37 59 131 15 54 137 1 53 129 33 58
134 9 4 -40 0 0 14 49 44 11 45 -32 136 11 13 131 58 28 137 32 34 130 20 51
134 41 48 -39 0 0 14 49 51 12 45 -33 136 40 16 132 35 38 137 59 21 131 1 42
135 10 15 -38 0 0 14 49 58 13 45 -34 137 5 27 133 7 55 138 22 31 131 37 11
135 34 46 -37 0 0 14 50 5 14 45 -35 137 27 5 133 35 49 138 42 22 132 7 50
135 55 40 -36 0 0 14 50 13 15 45 -36 137 45 26 133 59 41 138 59 6 132 34 6
136 13 12 -35 0 0 14 50 22 15 45 -37 138 0 41 134 19 51 139 12 56 132 56 22
136 27 36 -34 0 0 14 50 30 16 45 -38 138 13 3 134 36 33 139 24 1 133 14 56
136 39 2 -33 0 0 14 50 40 17 45 -39 138 22 42 134 50 2 139 32 31 133 30 2
136 47 40 -32 0 0 14 50 49 18 45 -40 138 29 44 135 0 29 139 38 32 133 41 54
136 53 39 -31 0 0 14 50 59 19 45 -41 138 34 18 135 8 3 139 42 12 133 50 43
136 57 5 -30 0 0 14 51 10 20 45 -42 138 36 30 135 12 53 139 43 36 133 56 37
136 58 5 -29 0 0 14 51 20 20 45 -43 138 36 25 135 15 5 139 42 49 133 59 45
136 56 44 -28 0 0 14 51 31 21 45 -44 138 34 7 135 14 45 139 39 55 134 0 14
136 53 5 -27 0 0 14 51 43 22 46 -45 138 29 41 135 11 59 139 34 57 133 58 7
136 47 12 -26 0 0 14 51 55 22 46 -46 138 23 8 135 6 49 139 27 59 133 53 30
136 39 9 -25 0 0 14 52 7 23 46 -47 138 14 33 134 59 20 139 19 2 133 46 26
136 28 56 -24 0 0 14 52 19 24 47 -48 138 3 56 134 49 33 139 8 8 133 36 57
136 16 36 -23 0 0 14 52 32 24 47 -49 137 51 19 134 37 29 138 55 20 133 25 6
136 2 9 -22 0 0 14 52 46 25 48 -50 137 36 42 134 23 11 138 40 36 133 10 52
135 45 35 -21 0 0 14 52 59 25 48 -51 137 20 7 134 6 37 138 23 58 132 54 16
135 26 54 -20 0 0 14 53 13 26 49 -52 137 1 32 133 47 47 138 5 25 132 35 18
135 6 6 -19 0 0 14 53 27 26 49 -53 136 40 56 133 26 40 137 44 57 132 13 55
134 43 7 -18 0 0 14 53 42 27 50 -54 136 18 19 133 3 14 137 22 32 131 50 5
134 17 56 -17 0 0 14 53 57 27 50 -55 135 53 38 132 37 25 136 58 9 131 23 44
133 50 29 -16 0 0 14 54 12 27 51 -56 135 26 50 132 9 10 136 31 44 130 54 49
133 20 42 -15 0 0 14 54 28 28 52 -57 134 57 52 131 38 24 136 3 15 130 23 12
132 48 30 -14 0 0 14 54 44 28 52 -58 134 26 40 131 5 0 135 32 38 129 48 48
132 13 48 -13 0 0 14 55 1 28 53 -59 133 53 8 130 28 51 134 59 49 129 11 26
131 36 27 -12 0 0 14 55 18 28 54 -60 133 17 11 129 49 48 134 24 41 128 30 56
130 56 18 -11 0 0 14 55 35 28 54 -61 132 38 40 129 7 38 133 47 9 127 47 5
130 13 10 -10 0 0 14 55 53 28 55 -62 131 57 27 128 22 10 133 7 5 126 59 35
129 26 51 - 9 0 0 14 56 11 28 56 -63 131 13 21 127 33 4 132 24 18 126 8 7
Uncertainty in time = +/- 7 secs
Prediction of 2013 Jul 8.0
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]