|
|
Updated: 2013 MAR 16, 13:43 UT
Event Rank : 32
(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 Mar 30 UT, the 25 km diameter asteroid (1783) Albitskij will occult a 10.9 mag star in the constellation Sextans for observers along a narrow path across eastern Australia from Mallacoota in eastern Victoria across eastern New South Wales (just east of Canberra), and across eastern Queensland from Goondiwindi to Ayr.
In the case of an occultation, the combined light of the asteroid and the star will drop by 4.5 mag to 15.4 mag (the magnitude of the asteroid) for at most 3.7 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: .
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
149 31 30 -46 0 0 9 49 7 35 33 -20 149 43 5 149 19 53 150 31 31 148 30 55
149 41 30 -45 0 0 9 49 19 35 34 -21 149 52 52 149 30 7 150 40 23 148 42 6
149 50 7 -44 0 0 9 49 30 36 34 -21 150 1 16 149 38 57 150 47 55 148 51 49
149 57 25 -43 0 0 9 49 42 37 34 -22 150 8 22 149 46 26 150 54 12 149 0 8
150 3 27 -42 0 0 9 49 54 38 34 -22 150 14 14 149 52 40 150 59 17 149 7 9
150 8 19 -41 0 0 9 50 6 39 35 -22 150 18 55 149 57 42 151 3 15 149 12 56
150 12 4 -40 0 0 9 50 18 40 35 -23 150 22 30 150 1 37 151 6 9 149 17 33
150 14 45 -39 0 0 9 50 30 41 35 -23 150 25 2 150 4 27 151 8 2 149 21 2
150 16 25 -38 0 0 9 50 43 42 36 -23 150 26 33 150 6 16 151 8 57 149 23 28
150 17 6 -37 0 0 9 50 56 43 36 -24 150 27 6 150 7 6 151 8 56 149 24 53
150 16 52 -36 0 0 9 51 9 43 37 -24 150 26 44 150 7 0 151 8 2 149 25 20
150 15 45 -35 0 0 9 51 23 44 37 -24 150 25 30 150 6 0 151 6 16 149 24 51
150 13 46 -34 0 0 9 51 36 45 38 -24 150 23 24 150 4 8 151 3 42 149 23 29
150 10 58 -33 0 0 9 51 50 46 38 -25 150 20 29 150 1 26 151 0 20 149 21 15
150 7 21 -32 0 0 9 52 4 47 39 -25 150 16 46 149 57 56 150 56 11 149 18 11
150 2 59 -31 0 0 9 52 18 47 40 -25 150 12 18 149 53 39 150 51 19 149 14 19
149 57 51 -30 0 0 9 52 32 48 40 -25 150 7 5 149 48 37 150 45 43 149 9 40
149 52 0 -29 0 0 9 52 46 49 41 -25 150 1 9 149 42 51 150 39 25 149 4 15
149 45 26 -28 0 0 9 53 1 50 42 -26 149 54 30 149 36 22 150 32 27 148 58 7
149 38 11 -27 0 0 9 53 16 50 43 -26 149 47 11 149 29 11 150 24 48 148 51 15
149 30 16 -26 0 0 9 53 31 51 44 -26 149 39 11 149 21 20 150 16 31 148 43 42
149 21 40 -25 0 0 9 53 46 52 45 -26 149 30 32 149 12 49 150 7 35 148 35 27
149 12 26 -24 0 0 9 54 1 52 46 -26 149 21 14 149 3 38 149 58 2 148 26 32
149 2 34 -23 0 0 9 54 16 53 47 -26 149 11 18 148 53 49 149 47 51 148 16 58
148 52 3 -22 0 0 9 54 32 53 48 -26 149 0 44 148 43 22 149 37 5 148 6 44
148 40 56 -21 0 0 9 54 47 54 49 -26 148 49 34 148 32 17 149 25 42 147 55 52
148 29 11 -20 0 0 9 55 3 55 50 -26 148 37 47 148 20 35 149 13 44 147 44 21
148 16 50 -19 0 0 9 55 19 55 52 -26 148 25 23 148 8 17 149 1 10 147 32 13
148 3 53 -18 0 0 9 55 35 56 53 -26 148 12 24 147 55 22 148 48 2 147 19 27
147 50 20 -17 0 0 9 55 51 56 54 -26 147 58 49 147 41 51 148 34 18 147 6 5
147 36 11 -16 0 0 9 56 7 57 56 -26 147 44 38 147 27 43 148 20 0 146 52 5
147 21 26 -15 0 0 9 56 23 57 57 -25 147 29 51 147 13 0 148 5 7 146 37 28
147 6 5 -14 0 0 9 56 40 57 59 -25 147 14 29 146 57 41 147 49 39 146 22 14
146 50 8 -13 0 0 9 56 56 58 60 -25 146 58 31 146 41 45 147 33 36 146 6 23
146 33 35 -12 0 0 9 57 13 58 62 -25 146 41 57 146 25 13 147 16 59 145 49 54
146 16 26 -11 0 0 9 57 30 58 63 -25 146 24 48 146 8 4 146 59 46 145 32 49
145 58 40 -10 0 0 9 57 46 58 65 -25 146 7 1 145 50 19 146 41 58 145 15 5
145 40 18 - 9 0 0 9 58 3 59 67 -24 145 48 38 145 31 56 146 23 33 144 56 44
145 21 18 - 8 0 0 9 58 20 59 68 -24 145 29 38 145 12 56 146 4 33 144 37 44
145 1 40 - 7 0 0 9 58 37 59 70 -24 145 10 0 144 53 18 145 44 56 144 18 5
144 41 23 - 6 0 0 9 58 54 59 72 -24 144 49 45 144 33 2 145 24 41 143 57 47
144 20 28 - 5 0 0 9 59 11 59 74 -23 144 28 50 144 12 6 145 3 49 143 36 48
143 58 53 - 4 0 0 9 59 28 59 75 -23 144 7 16 143 50 30 144 42 18 143 15 9
143 36 38 - 3 0 0 9 59 46 59 77 -23 143 45 1 143 28 13 144 20 8 142 52 48
143 13 41 - 2 0 0 10 0 3 59 79 -22 143 22 6 143 5 15 143 57 18 142 29 44
Uncertainty in time = +/- 8 secs
Prediction of 2013 Mar 16.0
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]