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Updated: 2005 MAR 12, 20:57 UT
Event Rank : 95
(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 2005 Apr 03 UT, the 86 km diameter asteroid (110) Lydia will occult a 11.2 mag star in the constellation Cancer for observers along a path across E Australia.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 12.9 mag (the magnitude of the asteroid) for at most 25.1 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Ron Stone, TMO astrometry for the asteroid kindly provided by Bill Owen, 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
149 1 55 -64 0 0 9 24 43 1 12 -13 148 3 59 149 59 29 147 13 51 150 48 43
149 29 16 -63 0 0 9 24 42 2 12 -14 148 33 33 150 24 40 147 45 20 151 12 4
149 53 54 -62 0 0 9 24 40 3 11 -14 149 0 12 150 47 19 148 13 45 151 33 1
150 16 6 -61 0 0 9 24 38 4 11 -15 149 24 15 151 7 41 148 39 26 151 51 51
150 36 9 -60 0 0 9 24 36 5 11 -15 149 46 0 151 26 2 149 2 40 152 8 46
150 54 15 -59 0 0 9 24 32 6 11 -15 150 5 42 151 42 35 149 23 44 152 23 58
151 10 37 -58 0 0 9 24 29 7 10 -16 150 23 32 151 57 30 149 42 51 152 37 39
151 25 25 -57 0 0 9 24 24 8 10 -16 150 39 41 152 10 56 150 0 11 152 49 57
151 38 47 -56 0 0 9 24 19 9 10 -17 150 54 19 152 23 3 150 15 56 153 0 59
151 50 51 -55 0 0 9 24 13 10 10 -17 151 7 35 152 33 57 150 30 14 153 10 54
152 1 46 -54 0 0 9 24 7 11 10 -17 151 19 36 152 43 46 150 43 12 153 19 46
152 11 35 -53 0 0 9 24 0 12 10 -18 151 30 28 152 52 34 150 54 58 153 27 41
152 20 26 -52 0 0 9 23 52 13 10 -18 151 40 17 153 0 26 151 5 38 153 34 44
152 28 22 -51 0 0 9 23 44 14 10 -18 151 49 8 153 7 28 151 15 16 153 41 0
152 35 28 -50 0 0 9 23 35 15 10 -19 151 57 6 153 13 43 151 23 59 153 46 31
152 41 49 -49 0 0 9 23 26 16 10 -19 152 4 15 153 19 15 151 31 50 153 51 22
152 47 26 -48 0 0 9 23 16 17 10 -19 152 10 38 153 24 7 151 38 53 153 55 35
152 52 24 -47 0 0 9 23 5 18 10 -19 152 16 19 153 28 22 151 45 11 153 59 13
152 56 45 -46 0 0 9 22 54 19 10 -20 152 21 21 153 32 3 151 50 49 154 2 19
153 0 32 -45 0 0 9 22 43 20 10 -20 152 25 46 153 35 11 151 55 47 154 4 55
153 3 46 -44 0 0 9 22 30 21 10 -20 152 29 37 153 37 49 152 0 10 154 7 2
153 6 30 -43 0 0 9 22 17 22 10 -20 152 32 56 153 39 59 152 3 58 154 8 42
153 8 46 -42 0 0 9 22 4 23 10 -21 152 35 44 153 41 43 152 7 15 154 9 58
153 10 35 -41 0 0 9 21 50 24 10 -21 152 38 4 153 43 1 152 10 2 154 10 50
153 11 59 -40 0 0 9 21 36 25 10 -21 152 39 58 153 43 56 152 12 21 154 11 20
153 12 59 -39 0 0 9 21 20 26 10 -21 152 41 25 153 44 28 152 14 12 154 11 29
153 13 37 -38 0 0 9 21 5 27 10 -21 152 42 29 153 44 39 152 15 39 154 11 17
153 13 52 -37 0 0 9 20 49 28 10 -21 152 43 9 153 44 30 152 16 41 154 10 46
153 13 47 -36 0 0 9 20 32 29 11 -21 152 43 28 153 44 1 152 17 20 154 9 57
153 13 22 -35 0 0 9 20 15 30 11 -21 152 43 25 153 43 13 152 17 36 154 8 51
153 12 37 -34 0 0 9 19 57 31 11 -22 152 43 2 153 42 8 152 17 32 154 7 27
153 11 34 -33 0 0 9 19 39 32 11 -22 152 42 19 153 40 45 152 17 6 154 5 47
153 10 14 -32 0 0 9 19 20 33 11 -22 152 41 18 153 39 5 152 16 21 154 3 51
153 8 35 -31 0 0 9 19 0 33 12 -22 152 39 57 153 37 9 152 15 17 154 1 39
153 6 40 -30 0 0 9 18 41 34 12 -22 152 38 19 153 34 57 152 13 53 153 59 12
153 4 28 -29 0 0 9 18 20 35 12 -22 152 36 24 153 32 29 152 12 12 153 56 30
153 2 0 -28 0 0 9 17 59 36 13 -22 152 34 11 153 29 45 152 10 12 153 53 34
152 59 16 -27 0 0 9 17 38 37 13 -22 152 31 41 153 26 47 152 7 54 153 50 23
152 56 16 -26 0 0 9 17 16 38 13 -22 152 28 54 153 23 33 152 5 20 153 46 58
152 53 0 -25 0 0 9 16 54 39 14 -22 152 25 51 153 20 4 152 2 27 153 43 18
152 49 28 -24 0 0 9 16 31 40 14 -21 152 22 32 153 16 21 151 59 18 153 39 25
152 45 41 -23 0 0 9 16 8 41 14 -21 152 18 56 153 12 23 151 55 52 153 35 17
152 41 39 -22 0 0 9 15 44 42 15 -21 152 15 4 153 8 10 151 52 9 153 30 55
152 37 20 -21 0 0 9 15 20 43 15 -21 152 10 55 153 3 41 151 48 9 153 26 18
152 32 46 -20 0 0 9 14 55 44 16 -21 152 6 30 152 58 58 151 43 51 153 21 27
152 27 56 -19 0 0 9 14 30 45 16 -21 152 1 48 152 54 0 151 39 17 153 16 22
152 22 50 -18 0 0 9 14 5 46 17 -21 151 56 50 152 48 46 151 34 25 153 11 1
152 17 28 -17 0 0 9 13 39 47 17 -21 151 51 35 152 43 16 151 29 16 153 5 25
152 11 49 -16 0 0 9 13 13 47 18 -20 151 46 2 152 37 31 151 23 49 152 59 34
152 5 53 -15 0 0 9 12 46 48 18 -20 151 40 12 152 31 29 151 18 4 152 53 28
151 59 40 -14 0 0 9 12 19 49 19 -20 151 34 4 152 25 11 151 12 0 152 47 5
151 53 9 -13 0 0 9 11 51 50 20 -20 151 27 38 152 18 36 151 5 38 152 40 26
151 46 20 -12 0 0 9 11 23 51 20 -19 151 20 53 152 11 43 150 58 57 152 33 30
151 39 13 -11 0 0 9 10 55 52 21 -19 151 13 49 152 4 33 150 51 56 152 26 16
151 31 47 -10 0 0 9 10 26 53 22 -19 151 6 26 151 57 4 150 44 35 152 18 45
151 24 1 - 9 0 0 9 9 57 53 23 -19 150 58 42 151 49 15 150 36 53 152 10 55
151 15 55 - 8 0 0 9 9 27 54 24 -18 150 50 38 151 41 8 150 28 50 152 2 46
151 7 28 - 7 0 0 9 8 57 55 25 -18 150 42 12 151 32 40 150 20 24 151 54 17
150 58 40 - 6 0 0 9 8 27 56 26 -18 150 33 24 151 23 51 150 11 37 151 45 28
150 49 29 - 5 0 0 9 7 57 57 27 -17 150 24 13 151 14 41 150 2 26 151 36 18
150 39 56 - 4 0 0 9 7 26 57 28 -17 150 14 39 151 5 8 149 52 51 151 26 45
150 29 59 - 3 0 0 9 6 55 58 29 -17 150 4 40 150 55 12 149 42 50 151 16 51
150 19 36 - 2 0 0 9 6 23 59 30 -16 149 54 16 150 44 52 149 32 24 151 6 32
150 8 48 - 1 0 0 9 5 51 59 32 -16 149 43 25 150 34 7 149 21 31 150 55 49
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
[Timing Details]
[Reporting Details]
[Report Form]
[Asteroid Occultation Results]
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