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Updated: 2022 Jun 29, 05:39 UT
Event Rank : 87
(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 2022 Aug 18 UT, the 55 km diameter asteroid (1428) Mombasa will occult a 12.5 mag star in the constellation Piscis Austrinus for observers along a slightly uncertain path across Northern Territory and West Australia, passing over Katherine and Albany.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.6 mag to 13.72 mag (the magnitude of the asteroid) for at most 4.9 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, in particular 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 313-260781 by 1428 Mombasa on 2022 Aug 18
Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 Alt
E. Longitude Latitude U.T. Alt Az Alt Crn
o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' "
Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude
136 25 6 -10 22 43 19 6 29.7 26 244 -29 136 50 52 -10 22 50 135 59 39 -10 22 24 137 21 5 -10 22 42 135 30 42 -10 21 49 0.73
136 0 9 -10 48 59 19 6 33.0 27 245 -30 136 25 39 -10 49 16 135 34 59 -10 48 30 136 55 31 -10 49 22 135 6 19 -10 47 43 0.73
135 35 48 -11 14 54 19 6 36.2 27 245 -30 136 1 2 -11 15 22 135 10 53 -11 14 15 136 30 34 -11 15 41 134 42 29 -11 13 18 0.73
135 11 59 -11 40 31 19 6 39.5 28 245 -31 135 36 58 -11 41 9 134 47 18 -11 39 43 136 6 13 -11 41 39 134 19 9 -11 38 35 0.73
134 48 41 -12 5 51 19 6 42.7 28 245 -31 135 13 26 -12 6 38 134 24 12 -12 4 53 135 42 25 -12 7 19 133 56 18 -12 3 36 0.73
134 25 51 -12 30 53 19 6 46.0 29 245 -31 134 50 24 -12 31 49 134 1 35 -12 29 48 135 19 7 -12 32 41 133 33 54 -12 28 20 0.73
134 3 29 -12 55 40 19 6 49.2 29 246 -32 134 27 50 -12 56 44 133 39 24 -12 54 26 134 56 18 -12 57 45 133 11 55 -12 52 50 0.73
133 41 32 -13 20 11 19 6 52.5 30 246 -32 134 5 42 -13 21 23 133 17 37 -13 18 50 134 33 57 -13 22 34 132 50 20 -13 17 6 0.73
133 20 0 -13 44 28 19 6 55.8 30 246 -33 133 44 0 -13 45 48 132 56 15 -13 43 0 134 12 2 -13 47 8 132 29 8 -13 41 8 0.73
132 58 50 -14 8 32 19 6 59.0 31 246 -33 133 22 41 -14 9 58 132 35 15 -14 6 57 133 50 32 -14 11 27 132 8 18 -14 4 57 0.73
132 38 3 -14 32 23 19 7 2.3 31 247 -33 133 1 45 -14 33 56 132 14 36 -14 30 41 133 29 25 -14 35 33 131 47 49 -14 28 34 0.73
132 17 37 -14 56 1 19 7 5.5 32 247 -34 132 41 10 -14 57 41 131 54 18 -14 54 13 133 8 41 -14 59 26 131 27 40 -14 51 59 0.73
131 57 31 -15 19 28 19 7 8.8 32 247 -34 132 20 56 -15 21 14 131 34 19 -15 17 33 132 48 17 -15 23 6 131 7 49 -15 15 12 0.73
131 37 44 -15 42 43 19 7 12.0 33 247 -34 132 1 2 -15 44 35 131 14 39 -15 40 43 132 28 14 -15 46 34 130 48 17 -15 38 15 0.73
131 18 15 -16 5 47 19 7 15.3 33 247 -35 131 41 26 -16 7 45 130 55 17 -16 3 42 132 8 30 -16 9 51 130 29 2 -16 1 8 0.73
130 59 4 -16 28 41 19 7 18.5 33 248 -35 131 22 8 -16 30 45 130 36 12 -16 26 31 131 49 4 -16 32 58 130 10 3 -16 23 50 0.73
130 40 9 -16 51 26 19 7 21.8 34 248 -35 131 3 8 -16 53 34 130 17 23 -16 49 10 131 29 56 -16 55 54 129 51 21 -16 46 24 0.73
130 21 30 -17 14 0 19 7 25.0 34 248 -36 130 44 23 -17 16 14 129 58 49 -17 11 39 131 11 5 -17 18 40 129 32 53 -17 8 48 0.73
130 3 7 -17 36 26 19 7 28.3 35 248 -36 130 25 54 -17 38 45 129 40 31 -17 34 0 130 52 30 -17 41 16 129 14 41 -17 31 3 0.73
129 44 58 -17 58 43 19 7 31.5 35 249 -36 130 7 41 -18 1 7 129 22 27 -17 56 12 130 34 10 -18 3 44 128 56 42 -17 53 10 0.73
129 27 3 -18 20 51 19 7 34.8 35 249 -37 129 49 42 -18 23 20 129 4 37 -18 18 16 130 16 5 -18 26 2 128 38 56 -18 15 9 0.73
129 9 22 -18 42 51 19 7 38.0 36 249 -37 129 31 56 -18 45 24 128 47 0 -18 40 12 129 58 15 -18 48 13 128 21 24 -18 36 59 0.73
128 51 55 -19 4 44 19 7 41.3 36 249 -37 129 14 25 -19 7 21 128 29 36 -19 2 0 129 40 38 -19 10 15 128 4 4 -18 58 43 0.73
128 34 39 -19 26 29 19 7 44.6 37 250 -37 128 57 6 -19 29 10 128 12 24 -19 23 41 129 23 15 -19 32 9 127 46 57 -19 20 19 0.73
128 17 36 -19 48 6 19 7 47.8 37 250 -38 128 39 59 -19 50 52 127 55 24 -19 45 14 129 6 4 -19 53 56 127 30 0 -19 41 48 0.73
128 0 45 -20 9 37 19 7 51.1 37 250 -38 128 23 4 -20 12 27 127 38 36 -20 6 41 128 49 5 -20 15 35 127 13 15 -20 3 10 0.73
127 44 5 -20 31 1 19 7 54.3 38 251 -38 128 6 21 -20 33 55 127 21 59 -20 28 1 128 32 18 -20 37 8 126 56 41 -20 24 26 0.73
127 27 35 -20 52 18 19 7 57.6 38 251 -38 127 49 49 -20 55 16 127 5 32 -20 49 15 128 15 43 -20 58 33 126 40 17 -20 45 35 0.73
127 11 17 -21 13 29 19 8 0.8 38 251 -39 127 33 28 -21 16 31 126 49 16 -21 10 22 127 59 19 -21 19 53 126 24 4 -21 6 38 0.73
126 55 8 -21 34 34 19 8 4.1 39 251 -39 127 17 17 -21 37 39 126 33 10 -21 31 23 127 43 5 -21 41 6 126 8 0 -21 27 36 0.73
126 39 10 -21 55 34 19 8 7.3 39 252 -39 127 1 16 -21 58 42 126 17 13 -21 52 19 127 27 2 -22 2 13 125 52 5 -21 48 27 0.73
126 23 20 -22 16 27 19 8 10.6 39 252 -39 126 45 25 -22 19 39 126 1 26 -22 13 9 127 11 9 -22 23 14 125 36 20 -22 9 14 0.73
126 7 40 -22 37 15 19 8 13.8 40 252 -40 126 29 44 -22 40 30 125 45 47 -22 33 54 126 55 25 -22 44 9 125 20 43 -22 29 54 0.74
125 52 9 -22 57 57 19 8 17.1 40 253 -40 126 14 11 -23 1 16 125 30 18 -22 54 33 126 39 50 -23 4 59 125 5 15 -22 50 30 0.74
125 36 47 -23 18 35 19 8 20.3 40 253 -40 125 58 47 -23 21 57 125 14 57 -23 15 7 126 24 25 -23 25 43 124 49 56 -23 11 1 0.74
125 21 33 -23 39 7 19 8 23.6 41 253 -40 125 43 32 -23 42 33 124 59 44 -23 35 36 126 9 8 -23 46 23 124 34 44 -23 31 26 0.74
125 6 27 -23 59 35 19 8 26.8 41 254 -40 125 28 25 -24 3 3 124 44 39 -23 56 1 125 54 0 -24 6 57 124 19 40 -23 51 47 0.74
124 51 29 -24 19 58 19 8 30.1 41 254 -41 125 13 26 -24 23 29 124 29 41 -24 16 21 125 39 0 -24 27 27 124 4 44 -24 12 4 0.74
124 36 38 -24 40 16 19 8 33.3 41 254 -41 124 58 35 -24 43 51 124 14 51 -24 36 36 125 24 8 -24 47 52 123 49 54 -24 32 16 0.74
124 21 55 -25 0 30 19 8 36.6 42 255 -41 124 43 51 -25 4 8 124 0 9 -24 56 48 125 9 23 -25 8 12 123 35 12 -24 52 24 0.74
124 7 19 -25 20 40 19 8 39.9 42 255 -41 124 29 15 -25 24 21 123 45 33 -25 16 54 124 54 46 -25 28 29 123 20 37 -25 12 27 0.74
123 52 50 -25 40 46 19 8 43.1 42 255 -41 124 14 46 -25 44 29 123 31 4 -25 36 57 124 40 17 -25 48 41 123 6 8 -25 32 27 0.74
123 38 28 -26 0 48 19 8 46.4 43 256 -41 124 0 23 -26 4 34 123 16 42 -25 56 56 124 25 54 -26 8 48 122 51 46 -25 52 23 0.74
123 24 12 -26 20 45 19 8 49.6 43 256 -42 123 46 7 -26 24 34 123 2 27 -26 16 51 124 11 38 -26 28 52 122 37 31 -26 12 15 0.74
123 10 3 -26 40 40 19 8 52.9 43 256 -42 123 31 58 -26 44 31 122 48 17 -26 36 43 123 57 29 -26 48 52 122 23 21 -26 32 3 0.74
122 56 0 -27 0 30 19 8 56.1 43 257 -42 123 17 55 -27 4 25 122 34 14 -26 56 31 123 43 26 -27 8 49 122 9 17 -26 51 48 0.74
122 42 3 -27 20 17 19 8 59.4 44 257 -42 123 3 59 -27 24 14 122 20 16 -27 16 15 123 29 30 -27 28 42 121 55 19 -27 11 29 0.74
122 28 11 -27 40 1 19 9 2.6 44 257 -42 122 50 8 -27 44 0 122 6 24 -27 35 56 123 15 40 -27 48 31 121 41 26 -27 31 7 0.74
122 14 26 -27 59 41 19 9 5.9 44 258 -42 122 36 23 -28 3 43 121 52 38 -27 55 34 123 1 55 -28 8 17 121 27 39 -27 50 42 0.74
122 0 45 -28 19 18 19 9 9.1 44 258 -43 122 22 43 -28 23 23 121 38 57 -28 15 8 122 48 17 -28 28 0 121 13 57 -28 10 14 0.74
121 47 11 -28 38 52 19 9 12.4 45 259 -43 122 9 9 -28 43 0 121 25 21 -28 34 40 122 34 44 -28 47 39 121 0 21 -28 29 43 0.74
121 33 41 -28 58 23 19 9 15.6 45 259 -43 121 55 41 -29 2 33 121 11 51 -28 54 8 122 21 16 -29 7 16 120 46 49 -28 49 8 0.74
121 20 16 -29 17 51 19 9 18.9 45 259 -43 121 42 17 -29 22 4 120 58 25 -29 13 34 122 7 54 -29 26 49 120 33 22 -29 8 31 0.74
121 6 57 -29 37 17 19 9 22.1 45 260 -43 121 28 59 -29 41 31 120 45 4 -29 32 57 121 54 37 -29 46 20 120 20 0 -29 27 51 0.74
120 53 42 -29 56 39 19 9 25.4 46 260 -43 121 15 45 -30 0 57 120 31 48 -29 52 17 121 41 25 -30 5 48 120 6 42 -29 47 9 0.74
120 40 32 -30 15 59 19 9 28.6 46 261 -43 121 2 36 -30 20 19 120 18 36 -30 11 35 121 28 18 -30 25 13 119 53 29 -30 6 24 0.74
120 27 26 -30 35 17 19 9 31.9 46 261 -43 120 49 32 -30 39 39 120 5 29 -30 30 50 121 15 15 -30 44 35 119 40 20 -30 25 36 0.74
120 14 25 -30 54 32 19 9 35.2 46 261 -44 120 36 33 -30 58 56 119 52 26 -30 50 3 121 2 18 -31 3 55 119 27 15 -30 44 46 0.74
120 1 28 -31 13 44 19 9 38.4 47 262 -44 120 23 37 -31 18 11 119 39 27 -31 9 13 120 49 24 -31 23 13 119 14 14 -31 3 54 0.74
119 48 35 -31 32 55 19 9 41.7 47 262 -44 120 10 46 -31 37 24 119 26 33 -31 28 21 120 36 36 -31 42 28 119 1 17 -31 22 59 0.74
119 35 46 -31 52 3 19 9 44.9 47 263 -44 119 57 59 -31 56 34 119 13 42 -31 47 27 120 23 51 -32 1 42 118 48 24 -31 42 2 0.74
119 23 1 -32 11 9 19 9 48.2 47 263 -44 119 45 17 -32 15 42 119 0 55 -32 6 30 120 11 10 -32 20 52 118 35 35 -32 1 3 0.74
119 10 20 -32 30 12 19 9 51.4 47 263 -44 119 32 38 -32 34 48 118 48 12 -32 25 32 119 58 34 -32 40 1 118 22 49 -32 20 2 0.74
118 57 42 -32 49 14 19 9 54.7 48 264 -44 119 20 2 -32 53 53 118 35 32 -32 44 32 119 46 1 -32 59 8 118 10 7 -32 38 59 0.75
118 45 9 -33 8 14 19 9 57.9 48 264 -44 119 7 31 -33 12 55 118 22 56 -33 3 29 119 33 33 -33 18 13 117 57 28 -32 57 55 0.75
118 32 38 -33 27 12 19 10 1.2 48 265 -44 118 55 3 -33 31 55 118 10 23 -33 22 25 119 21 8 -33 37 16 117 44 52 -33 16 48 0.75
118 20 11 -33 46 9 19 10 4.4 48 265 -44 118 42 39 -33 50 54 117 57 53 -33 41 19 119 8 46 -33 56 17 117 32 20 -33 35 40 0.75
118 7 48 -34 5 3 19 10 7.7 48 266 -44 118 30 18 -34 9 50 117 45 27 -34 0 12 118 56 29 -34 15 16 117 19 51 -33 54 29 0.75
117 55 27 -34 23 56 19 10 10.9 49 266 -44 118 18 0 -34 28 46 117 33 4 -34 19 2 118 44 14 -34 34 14 117 7 25 -34 13 18 0.75
117 43 10 -34 42 48 19 10 14.2 49 267 -44 118 5 46 -34 47 39 117 20 44 -34 37 52 118 32 3 -34 53 10 116 55 1 -34 32 4 0.75
117 30 56 -35 1 37 19 10 17.4 49 267 -45 117 53 34 -35 6 31 117 8 27 -34 56 39 118 19 55 -35 12 5 116 42 41 -34 50 50 0.75
117 18 44 -35 20 26 19 10 20.7 49 267 -45 117 41 26 -35 25 22 116 56 12 -35 15 26 118 7 51 -35 30 58 116 30 23 -35 9 33 0.75
117 6 36 -35 39 13 19 10 23.9 49 268 -45 117 29 21 -35 44 11 116 44 1 -35 34 10 117 55 49 -35 49 49 116 18 7 -35 28 16 0.75
116 54 30 -35 57 58 19 10 27.2 49 268 -45 117 17 18 -36 2 59 116 31 52 -35 52 54 117 43 50 -36 8 40 116 5 55 -35 46 57 0.75
116 42 27 -36 16 43 19 10 30.5 50 269 -45 117 5 19 -36 21 45 116 19 45 -36 11 36 117 31 54 -36 27 29 115 53 45 -36 5 37 0.75
116 30 27 -36 35 26 19 10 33.7 50 269 -45 116 53 22 -36 40 30 116 7 41 -36 30 17 117 20 1 -36 46 16 115 41 37 -36 24 15 0.75
116 18 29 -36 54 8 19 10 37.0 50 270 -45 116 41 27 -36 59 15 115 55 40 -36 48 57 117 8 11 -37 5 3 115 29 31 -36 42 53 0.75
116 6 33 -37 12 49 19 10 40.2 50 270 -45 116 29 35 -37 17 58 115 43 41 -37 7 36 116 56 24 -37 23 48 115 17 28 -37 1 29 0.75
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