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Updated: 2022 DEC 01, 02:16 UT
Event Rank : 99
(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 2023 Jan 23 UT, the 127.6 km diameter asteroid (426) Hippo will occult a 12.4 mag star in the constellation Corvus for observers along a path across Australia, from Darwin across tt and into eastern South Australia in morning twilight.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.37 mag to 13.40 mag (the magnitude of the asteroid) for at most 8.490 seconds.
This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center.
This work has made use of data from the European Space Agency (ESA)mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, inparticular the institutions participating in the Gaia Multilateral Agreement.
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 UCAC4-337-065362 by 426 Hippo on 2023 Jan 23
Centre Star Star Sun Path Limits Error Limits Alt
E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' "
Longitude Longitude Longitude Longitude
128 30 22 0 0 0 19 50 49.8 67 177 -25 127 54 28 129 6 18 127 39 41 129 21 7 -0.09
128 47 27 - 1 0 0 19 50 57.0 68 178 -24 128 11 31 129 23 25 127 56 44 129 38 14 -0.09
129 4 39 - 2 0 0 19 51 4.2 69 178 -24 128 28 41 129 40 39 128 13 53 129 55 30 -0.09
129 21 59 - 3 0 0 19 51 11.5 70 179 -23 128 45 59 129 58 3 128 31 10 130 12 55 -0.09
129 39 29 - 4 0 0 19 51 18.8 71 180 -22 129 3 25 130 15 36 128 48 34 130 30 30 -0.10
129 57 9 - 5 0 0 19 51 26.2 72 181 -22 129 21 0 130 33 20 129 6 7 130 48 16 -0.10
130 14 59 - 6 0 0 19 51 33.6 73 182 -21 129 38 45 130 51 16 129 23 50 131 6 13 -0.10
130 33 1 - 7 0 0 19 51 41.1 74 183 -20 129 56 41 131 9 24 129 41 44 131 24 24 -0.10
130 51 15 - 8 0 0 19 51 48.6 75 185 -20 130 14 48 131 27 45 129 59 49 131 42 48 -0.10
131 9 43 - 9 0 0 19 51 56.2 76 186 -19 130 33 8 131 46 21 130 18 6 132 1 27 -0.10
131 28 25 -10 0 0 19 52 3.8 77 188 -18 130 51 42 132 5 12 130 36 36 132 20 21 -0.10
131 47 23 -11 0 0 19 52 11.5 78 190 -18 131 10 31 132 24 19 130 55 21 132 39 32 -0.10
132 6 37 -12 0 0 19 52 19.1 79 193 -17 131 29 35 132 43 43 131 14 21 132 59 1 -0.10
132 26 8 -13 0 0 19 52 26.8 80 196 -16 131 48 55 133 3 26 131 33 37 133 18 49 -0.10
132 45 59 -14 0 0 19 52 34.6 80 200 -15 132 8 34 133 23 28 131 53 11 133 38 56 -0.10
133 6 9 -15 0 0 19 52 42.3 81 204 -15 132 28 31 133 43 52 132 13 3 133 59 25 -0.10
133 26 40 -16 0 0 19 52 50.1 82 209 -14 132 48 49 134 4 37 132 33 15 134 20 16 -0.10
133 47 34 -17 0 0 19 52 57.9 83 215 -13 133 9 28 134 25 46 132 53 48 134 41 31 -0.10
134 8 51 -18 0 0 19 53 5.8 83 223 -12 133 30 29 134 47 19 133 14 43 135 3 11 -0.11
134 30 34 -19 0 0 19 53 13.6 83 231 -12 133 51 55 135 9 19 133 36 2 135 25 18 -0.11
134 52 43 -20 0 0 19 53 21.5 84 240 -11 134 13 46 135 31 46 133 57 46 135 47 53 -0.11
135 15 21 -21 0 0 19 53 29.4 84 250 -10 134 36 5 135 54 43 134 19 56 136 10 58 -0.11
135 38 28 -22 0 0 19 53 37.3 84 260 -9 134 58 52 136 18 11 134 42 35 136 34 35 -0.11
136 2 8 -23 0 0 19 53 45.2 83 269 -8 135 22 10 136 42 13 135 5 44 136 58 45 -0.11
136 26 20 -24 0 0 19 53 53.2 83 277 -8 135 46 0 137 6 49 135 29 25 137 23 31 -0.11
136 51 9 -25 0 0 19 54 1.1 82 284 -7 136 10 24 137 32 2 135 53 39 137 48 54 -0.11
137 16 35 -26 0 0 19 54 9.1 82 290 -6 136 35 25 137 57 54 136 18 29 138 14 58 -0.11
137 42 42 -27 0 0 19 54 17.0 81 295 -5 137 1 4 138 24 28 136 43 57 138 41 43 -0.11
138 9 30 -28 0 0 19 54 25.0 80 299 -4 137 27 24 138 51 46 137 10 6 139 9 14 -0.11
138 37 4 -29 0 0 19 54 32.9 79 302 -4 137 54 27 139 19 51 137 36 57 139 37 32 -0.11
139 5 26 -30 0 0 19 54 40.9 78 305 -3 138 22 17 139 48 46 138 4 33 140 6 40 -0.11
139 34 39 -31 0 0 19 54 48.8 77 307 -2 138 50 55 140 18 34 138 32 58 140 36 42 -0.11
140 4 46 -32 0 0 19 54 56.7 76 309 -1 139 20 26 140 49 18 139 2 14 141 7 41 -0.11
Latitude Latitude Latitude Latitude
141 0 0 -33 45 20 19 55 10.7 75 312 0 -35 9 30 -32 20 28 -35 43 57 -31 45 17 -0.11
142 0 0 -35 33 12 19 55 24.9 73 314 2 -36 54 40 -34 11 5 -37 28 2 -33 37 4 -0.11
143 0 0 -37 14 40 19 55 38.3 71 315 3 -38 33 34 -35 55 10 -39 5 54 -35 22 14 -0.12
144 0 0 -38 50 9 19 55 50.8 69 316 5 -40 6 38 -37 33 6 -40 37 59 -37 1 12 -0.12
145 0 0 -40 20 2 19 56 2.6 68 316 6 -41 34 16 -39 5 18 -42 4 41 -38 34 23 -0.12
146 0 0 -41 44 43 19 56 13.6 66 316 7 -42 56 48 -40 32 11 -43 26 21 -40 2 10 -0.12
147 0 0 -43 4 34 19 56 24.0 64 317 8 -44 14 37 -41 54 5 -44 43 21 -41 24 55 -0.12
148 0 0 -44 19 53 19 56 33.7 63 316 9 -45 28 1 -43 11 20 -45 55 59 -42 42 59 -0.12
149 0 0 -45 30 59 19 56 42.9 62 316 10 -46 37 20 -44 24 17 -47 4 33 -43 56 42 -0.12
Uncertainty in time = +/- 3 secs
Prediction of 2022 Dec 1.1
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