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Updated: 2013 Feb 08, 20:10 UT
Event Rank : 96
(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 Apr 04 UT, the 116 km diameter asteroid (105) Artemis will occult a 12.5 mag star in the constellation Hydra for observers along a path across eastern Australia, running from eastern Tasmania to Cape York Peninsula, passing across eastern Victoria, western New South Wales and western and northern Queensland.
In the case of an occultation, the combined light of the asteroid and the star will drop by 0.8 mag to 12.6 mag (the magnitude of the asteroid) for at most 10.4 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.
Occultation of TYC 0212-00508-1 by 105 Artemis on 2013 Apr 4
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
155 30 9 -45 0 0 14 32 57 10 282 -49 159 2 27 152 39 5 163 8 9 150 36 46
153 33 44 -44 0 0 14 33 4 12 283 -51 156 32 54 151 1 33 159 35 41 149 9 59
151 56 32 -43 0 0 14 33 12 13 284 -52 154 34 51 149 37 51 157 7 39 147 54 29
150 33 31 -42 0 0 14 33 20 14 284 -53 152 57 13 148 25 5 155 11 35 146 48 11
149 21 36 -41 0 0 14 33 28 15 285 -54 151 34 23 147 21 15 153 36 0 145 49 38
148 18 46 -40 0 0 14 33 36 16 285 -56 150 23 0 146 24 58 152 15 11 144 57 44
147 23 33 -39 0 0 14 33 44 17 286 -57 149 20 54 145 35 10 151 5 46 144 11 39
146 34 52 -38 0 0 14 33 52 18 286 -58 148 26 34 144 51 3 150 5 35 143 30 42
145 51 54 -37 0 0 14 34 1 19 286 -59 147 38 52 144 11 58 149 13 5 142 54 21
145 14 1 -36 0 0 14 34 9 20 286 -60 146 56 58 143 37 25 148 27 12 142 22 10
144 40 41 -35 0 0 14 34 18 20 286 -61 146 20 12 143 6 59 147 47 5 141 53 49
144 11 30 -34 0 0 14 34 27 21 286 -62 145 48 4 142 40 19 147 12 5 141 28 58
143 46 6 -33 0 0 14 34 36 21 286 -63 145 20 7 142 17 8 146 41 41 141 7 22
143 24 14 -32 0 0 14 34 45 22 286 -64 144 56 1 141 57 10 146 15 29 140 48 49
143 5 37 -31 0 0 14 34 54 22 286 -65 144 35 30 141 40 15 145 53 9 140 33 8
142 50 6 -30 0 0 14 35 3 23 285 -66 144 18 18 141 26 11 145 34 24 140 20 9
142 37 28 -29 0 0 14 35 13 23 285 -67 144 4 15 141 14 50 145 19 1 140 9 45
142 27 37 -28 0 0 14 35 22 24 285 -68 143 53 10 141 6 5 145 6 48 140 1 48
142 20 26 -27 0 0 14 35 32 24 284 -69 143 44 56 140 59 49 144 57 37 139 56 14
142 15 47 -26 0 0 14 35 41 24 284 -70 143 39 26 140 55 57 144 51 20 139 52 58
142 13 38 -25 0 0 14 35 51 25 283 -71 143 36 35 140 54 26 144 47 51 139 51 56
142 13 54 -24 0 0 14 36 1 25 283 -72 143 36 19 140 55 12 144 47 6 139 53 5
142 16 32 -23 0 0 14 36 11 25 283 -73 143 38 34 140 58 13 144 49 1 139 56 23
142 21 32 -22 0 0 14 36 21 25 282 -74 143 43 19 141 3 26 144 53 34 140 1 48
142 28 51 -21 0 0 14 36 31 25 281 -75 143 50 33 141 10 52 145 0 45 140 9 19
142 38 30 -20 0 0 14 36 41 25 281 -76 144 0 16 141 20 29 145 10 33 140 18 57
142 50 30 -19 0 0 14 36 51 25 280 -77 144 12 28 141 32 19 145 22 59 140 30 41
143 4 52 -18 0 0 14 37 2 25 280 -78 144 27 13 141 46 24 145 38 7 140 44 34
143 21 39 -17 0 0 14 37 12 25 279 -79 144 44 33 142 2 44 145 56 0 141 0 36
143 40 55 -16 0 0 14 37 22 25 279 -80 145 4 33 142 21 24 146 16 44 141 18 51
144 2 44 -15 0 0 14 37 33 24 278 -81 145 27 18 142 42 27 146 40 24 141 39 21
144 27 13 -14 0 0 14 37 43 24 277 -81 145 52 56 143 5 58 147 7 11 142 2 13
144 54 29 -13 0 0 14 37 54 24 277 -82 146 21 36 143 32 5 147 37 15 142 27 31
145 24 42 -12 0 0 14 38 4 23 276 -83 146 53 31 144 0 54 148 10 51 142 55 23
145 58 3 -11 0 0 14 38 15 23 276 -83 147 28 54 144 32 36 148 48 17 143 25 56
146 34 47 -10 0 0 14 38 26 22 275 -83 148 8 4 145 7 22 149 29 54 143 59 20
Uncertainty in time = +/- 5 secs
Prediction of 2013 Feb 9.0
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