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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 the time for your location)
On 2004 Jul 27 UT, the 80 km diameter asteroid (32) Pomona will occult a 11.6 mag star in the constellation Taurus for observers along a path across Tasmania.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 13.0 mag (the magnitude of the asteroid) for at most 3.1 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Ron Stone, 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
... .. .. -59 0 0 .. .. .. .. .. .. ... .. .. ... .. .. 114 35 46 ... .. ..
112 41 54 -58 0 0 19 56 44 1 50 -37 114 29 8 110 54 58 116 49 9 ... .. ..
114 58 21 -57 0 0 19 56 44 2 48 -36 116 43 11 113 13 55 119 0 14 110 58 37
Latitude Latitude Latitude Latitude
115 0 0 -56 59 16 19 56 44 2 48 -36 -57 46 17 -56 13 20 -58 49 11 -55 15 8
116 0 0 -56 32 30 19 56 44 3 47 -36 -57 19 27 -55 46 39 -58 22 15 -54 48 31
117 0 0 -56 5 32 19 56 44 4 46 -35 -56 52 24 -55 19 45 -57 55 4 -54 21 43
118 0 0 -55 38 22 19 56 45 5 45 -35 -56 25 8 -54 52 40 -57 27 41 -53 54 44
119 0 0 -55 11 2 19 56 45 5 45 -34 -55 57 42 -54 25 26 -57 0 7 -53 27 36
120 0 0 -54 43 32 19 56 46 6 44 -34 -55 30 6 -53 58 2 -56 32 21 -53 0 19
121 0 0 -54 15 53 19 56 46 7 43 -33 -55 2 20 -53 30 29 -56 4 25 -52 32 55
122 0 0 -53 48 7 19 56 47 7 42 -33 -54 34 26 -53 2 50 -55 36 21 -52 5 24
123 0 0 -53 20 14 19 56 48 8 41 -33 -54 6 25 -52 35 4 -55 8 9 -51 37 46
124 0 0 -52 52 15 19 56 49 9 40 -32 -53 38 19 -52 7 13 -54 39 51 -51 10 4
125 0 0 -52 24 12 19 56 50 10 40 -32 -53 10 7 -51 39 17 -54 11 27 -50 42 19
126 0 0 -51 56 5 19 56 51 10 39 -31 -52 41 51 -51 11 19 -53 42 58 -50 14 30
127 0 0 -51 27 55 19 56 52 11 38 -30 -52 13 32 -50 43 18 -53 14 27 -49 46 40
128 0 0 -50 59 44 19 56 53 12 37 -30 -51 45 12 -50 15 16 -52 45 53 -49 18 49
129 0 0 -50 31 33 19 56 54 13 36 -29 -51 16 51 -49 47 14 -52 17 18 -48 50 58
130 0 0 -50 3 23 19 56 55 13 35 -29 -50 48 30 -49 19 13 -51 48 43 -48 23 8
131 0 0 -49 35 14 19 56 57 14 35 -28 -50 20 11 -48 51 14 -51 20 9 -47 55 21
132 0 0 -49 7 8 19 56 58 15 34 -27 -49 51 55 -48 23 18 -50 51 38 -47 27 37
133 0 0 -48 39 7 19 57 0 16 33 -27 -49 23 42 -47 55 27 -50 23 11 -46 59 58
134 0 0 -48 11 10 19 57 1 16 32 -26 -48 55 35 -47 27 40 -49 54 47 -46 32 24
135 0 0 -47 43 19 19 57 3 17 31 -25 -48 27 33 -47 0 0 -49 26 30 -46 4 56
136 0 0 -47 15 36 19 57 5 18 30 -25 -47 59 38 -46 32 27 -48 58 20 -45 37 36
137 0 0 -46 48 1 19 57 7 19 30 -24 -47 31 52 -46 5 3 -48 30 17 -45 10 24
138 0 0 -46 20 35 19 57 9 19 29 -23 -47 4 14 -45 37 47 -48 2 24 -44 43 22
139 0 0 -45 53 19 19 57 11 20 28 -23 -46 36 47 -45 10 43 -47 34 40 -44 16 31
140 0 0 -45 26 15 19 57 13 21 27 -22 -46 9 31 -44 43 49 -47 7 8 -43 49 50
141 0 0 -44 59 23 19 57 15 22 26 -21 -45 42 27 -44 17 8 -46 39 48 -43 23 23
142 0 0 -44 32 44 19 57 17 22 25 -20 -45 15 37 -43 50 40 -46 12 42 -42 57 8
143 0 0 -44 6 19 19 57 20 23 24 -20 -44 49 1 -43 24 26 -45 45 49 -42 31 8
144 0 0 -43 40 10 19 57 22 24 23 -19 -44 22 40 -42 58 28 -45 19 12 -42 5 23
145 0 0 -43 14 16 19 57 25 24 22 -18 -43 56 35 -42 32 45 -44 52 51 -41 39 54
146 0 0 -42 48 40 19 57 27 25 21 -17 -43 30 47 -42 7 20 -44 26 46 -41 14 41
147 0 0 -42 23 21 19 57 30 26 21 -16 -43 5 16 -41 42 12 -44 1 0 -40 49 47
148 0 0 -41 58 21 19 57 33 26 20 -16 -42 40 5 -41 17 23 -43 35 33 -40 25 11
149 0 0 -41 33 41 19 57 36 27 19 -15 -42 15 13 -40 52 53 -43 10 26 -40 0 54
150 0 0 -41 9 21 19 57 38 28 18 -14 -41 50 42 -40 28 44 -42 45 39 -39 36 58
151 0 0 -40 45 22 19 57 41 28 17 -13 -41 26 32 -40 4 55 -42 21 13 -39 13 22
152 0 0 -40 21 45 19 57 44 29 16 -12 -41 2 44 -39 41 29 -41 57 10 -38 50 8
153 0 0 -39 58 30 19 57 48 29 15 -11 -40 39 19 -39 18 24 -41 33 30 -38 27 17
154 0 0 -39 35 39 19 57 51 30 14 -11 -40 16 17 -38 55 43 -41 10 13 -38 4 48
155 0 0 -39 13 12 19 57 54 31 13 -10 -39 53 39 -38 33 26 -40 47 21 -37 42 43
156 0 0 -38 51 9 19 57 57 31 12 -9 -39 31 26 -38 11 33 -40 24 53 -37 21 2
157 0 0 -38 29 32 19 58 0 32 10 -8 -39 9 38 -37 50 6 -40 2 52 -36 59 47
158 0 0 -38 8 20 19 58 4 32 9 -7 -38 48 17 -37 29 4 -39 41 16 -36 38 56
159 0 0 -37 47 35 19 58 7 33 8 -6 -38 27 22 -37 8 28 -39 20 8 -36 18 32
160 0 0 -37 27 18 19 58 11 33 7 -5 -38 6 55 -36 48 20 -38 59 27 -35 58 35
161 0 0 -37 7 27 19 58 14 33 6 -4 -37 46 55 -36 28 38 -38 39 14 -35 39 5
162 0 0 -36 48 5 19 58 18 34 5 -4 -37 27 24 -36 9 25 -38 19 30 -35 20 2
163 0 0 -36 29 12 19 58 21 34 4 -3 -37 8 21 -35 50 40 -38 0 15 -35 1 27
164 0 0 -36 10 47 19 58 25 35 3 -2 -36 49 48 -35 32 24 -37 41 30 -34 43 22
165 0 0 -35 52 52 19 58 28 35 1 -1 -36 31 44 -35 14 37 -37 23 15 -34 25 45
166 0 0 -35 35 27 19 58 32 35 0 0 -36 14 11 .. .. .. -37 5 30 .. .. ..
Use these links for further information:
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[Observing Details]
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[Asteroid Occultation Results]
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