|
|
Updated: 2007 MAR 18, 02:42 UT
Event Rank : 8
(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 2007 Apr 13 UT, the 16 km diameter asteroid (3275) Oberndorfer will occult a 9.5 mag star in the constellation Ophiuchus for observers along a narrow, very large uncertainty path down the east coast of Australia.
In the case of an occultation, the combined light of the asteroid and the star will drop by 6.3 mag to 15.8 mag (the magnitude of the asteroid) for at most 4.0 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: 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 Limit1 Path Limit2 Error Limit1 Error Limit2
E. Longitude Latitude U.T. Alt Az Alt
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' "
Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude
152 14 47 -17 27 58 12 29 15 26 107 -68 152 24 31 -17 30 7 152 5 0 -17 25 46 155 5 34 -18 4 4 149 7 14 -16 43 49
152 11 25 -18 10 25 12 29 33 27 107 -68 152 21 8 -18 12 33 152 1 39 -18 8 15 155 1 57 -18 46 14 149 4 27 -17 26 42
152 7 0 -18 52 34 12 29 52 27 106 -68 152 16 42 -18 54 41 151 57 15 -18 50 24 154 57 25 -19 28 9 149 0 29 -18 9 12
152 1 35 -19 34 25 12 30 10 27 106 -67 152 11 17 -19 36 32 151 51 50 -19 32 17 154 51 58 -20 9 50 148 55 20 -18 51 21
151 55 8 -20 16 0 12 30 29 27 106 -67 152 4 50 -20 18 7 151 45 24 -20 13 52 154 45 37 -20 51 16 148 49 1 -19 33 10
151 47 41 -20 57 19 12 30 48 27 105 -67 151 57 23 -20 59 25 151 37 56 -20 55 12 154 38 22 -21 32 29 148 41 33 -20 14 39
151 39 13 -21 38 23 12 31 6 28 105 -66 151 48 56 -21 40 28 151 29 27 -21 36 15 154 30 12 -22 13 29 148 32 56 -20 55 49
151 29 44 -22 19 11 12 31 25 28 105 -66 151 39 28 -22 21 17 151 19 57 -22 17 4 154 21 7 -22 54 16 148 23 11 -21 36 41
151 19 14 -22 59 45 12 31 43 28 104 -66 151 29 0 -23 1 50 151 9 26 -22 57 38 154 11 7 -23 34 51 148 12 16 -22 17 15
151 7 42 -23 40 4 12 32 2 28 104 -65 151 17 30 -23 42 10 150 57 52 -23 37 57 154 0 10 -24 15 14 148 0 12 -22 57 31
150 55 7 -24 20 9 12 32 20 28 104 -65 151 4 57 -24 22 16 150 45 15 -24 18 2 153 48 17 -24 55 26 147 46 57 -23 37 30
150 41 29 -25 0 1 12 32 39 28 104 -64 150 51 22 -25 2 8 150 31 34 -24 57 53 153 35 27 -25 35 26 147 32 32 -24 17 12
150 26 47 -25 39 39 12 32 57 28 103 -64 150 36 42 -25 41 46 150 16 49 -25 37 30 153 21 38 -26 15 15 147 16 54 -24 56 37
150 10 59 -26 19 3 12 33 16 28 103 -63 150 20 58 -26 21 12 150 0 57 -26 16 54 153 6 49 -26 54 53 147 0 4 -25 35 46
149 54 4 -26 58 14 12 33 35 28 103 -63 150 4 6 -27 0 24 149 43 59 -26 56 4 152 51 0 -27 34 20 146 41 58 -26 14 37
149 36 0 -27 37 12 12 33 53 28 103 -62 149 46 6 -27 39 22 149 25 51 -27 35 0 152 34 8 -28 13 36 146 22 36 -26 53 12
149 16 46 -28 15 56 12 34 12 28 102 -62 149 26 57 -28 18 7 149 6 32 -28 13 43 152 16 12 -28 52 42 146 1 55 -27 31 29
148 56 19 -28 54 26 12 34 30 28 102 -61 149 6 35 -28 56 39 148 46 1 -28 52 12 151 57 10 -29 31 36 145 39 54 -28 9 30
148 34 38 -29 32 43 12 34 49 27 102 -60 148 44 59 -29 34 57 148 24 14 -29 30 27 151 37 1 -30 10 19 145 16 29 -28 47 12
148 11 40 -30 10 45 12 35 7 27 102 -60 148 22 7 -30 13 2 148 1 11 -30 8 27 151 15 41 -30 48 52 144 51 38 -29 24 37
147 47 23 -30 48 33 12 35 26 27 101 -59 147 57 56 -30 50 51 147 36 47 -30 46 13 150 53 10 -31 27 13 144 25 18 -30 1 42
147 21 43 -31 26 6 12 35 44 27 101 -59 147 32 23 -31 28 26 147 11 1 -31 23 43 150 29 23 -32 5 22 143 57 26 -30 38 29
146 54 38 -32 3 23 12 36 3 27 101 -58 147 5 24 -32 5 46 146 43 48 -32 0 58 150 4 19 -32 43 19 143 27 58 -31 14 55
146 26 3 -32 40 24 12 36 22 27 101 -57 146 36 57 -32 42 50 146 15 6 -32 37 57 149 37 55 -33 21 4 142 56 49 -31 50 59
145 55 56 -33 17 8 12 36 40 26 101 -57 146 6 58 -33 19 37 145 44 50 -33 14 38 149 10 6 -33 58 36 142 23 56 -32 26 41
145 24 12 -33 53 34 12 36 59 26 101 -56 145 35 23 -33 56 6 145 12 57 -33 51 1 148 40 50 -34 35 54 141 49 12 -33 2 0
144 50 46 -34 29 42 12 37 17 26 101 -55 145 2 7 -34 32 17 144 39 22 -34 27 5 148 10 3 -35 12 58 141 12 34 -33 36 53
144 15 34 -35 5 29 12 37 36 26 101 -54 144 27 5 -35 8 8 144 4 0 -35 2 48 147 37 40 -35 49 47 140 33 53 -34 11 18
143 38 30 -35 40 55 12 37 54 25 101 -54 143 50 12 -35 43 38 143 26 45 -35 38 10 147 3 37 -36 26 19 139 53 4 -34 45 15
142 59 29 -36 15 58 12 38 13 25 101 -53 143 11 22 -36 18 45 142 47 32 -36 13 8 146 27 48 -37 2 35 139 10 0 -35 18 40
142 18 23 -36 50 35 12 38 31 24 101 -52 142 30 28 -36 53 28 142 6 13 -36 47 41 145 50 10 -37 38 32 138 24 30 -35 51 30
141 35 6 -37 24 46 12 38 50 24 101 -51 141 47 25 -37 27 44 141 22 42 -37 21 46 145 10 34 -38 14 9 137 36 27 -36 23 42
140 49 29 -37 58 28 12 39 9 24 101 -51 141 2 3 -38 1 32 140 36 51 -37 55 22 144 28 55 -38 49 24 136 45 39 -36 55 13
140 1 24 -38 31 37 12 39 27 23 101 -50 140 14 14 -38 34 47 139 48 31 -38 28 24 143 45 7 -39 24 16 135 51 54 -37 25 58
139 10 42 -39 4 11 12 39 46 23 101 -49 139 23 48 -39 7 28 138 57 31 -39 0 51 142 59 0 -39 58 42 134 54 57 -37 55 51
138 17 10 -39 36 5 12 40 4 22 102 -48 138 30 35 -39 39 31 138 3 40 -39 32 37 142 10 27 -40 32 39 133 54 33 -38 24 47
137 20 38 -40 7 16 12 40 23 22 102 -47 137 34 23 -40 10 50 137 6 47 -40 3 39 141 19 17 -41 6 6 132 50 23 -38 52 37
136 20 50 -40 37 39 12 40 41 21 102 -47 136 34 57 -40 41 23 136 6 37 -40 33 52 140 25 22 -41 38 58 131 42 4 -39 19 12
135 17 31 -41 7 6 12 41 0 20 103 -46 135 32 3 -41 11 1 135 2 53 -41 3 8 139 28 28 -42 11 12 130 29 9 -39 44 22
134 10 23 -41 35 32 12 41 18 20 103 -45 134 25 22 -41 39 39 133 55 17 -41 31 22 138 28 22 -42 42 43 129 11 4 -40 7 50
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]