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Updated: 2022 Jun 13, 20:52 UT
Event Rank : 82
(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 13 UT, the 56 km diameter asteroid (269) Justitia will occult a 11.5 mag star in the constellation Sagittarius for observers along a slightly uncertain path running along the western coast of West Australia from Shark Bay to Point D'Entrecasteaux.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.5 mag to 12.77 mag (the magnitude of the asteroid) for at most 18.1 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 364-132722 by 269 Justitia on 2022 Aug 13
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
111 26 3 -20 32 23 14 42 35.3 74 279 -62 111 41 49 -20 27 25 111 10 17 -20 37 20 112 2 22 -20 20 55 110 49 45 -20 43 45 -0.26
111 31 2 -20 53 26 14 42 48.6 74 280 -62 111 46 50 -20 48 27 111 15 14 -20 58 24 112 7 26 -20 41 56 110 54 40 -21 4 50 -0.27
111 36 7 -21 14 29 14 43 1.8 74 281 -62 111 51 57 -21 9 29 111 20 17 -21 19 27 112 12 35 -21 2 57 110 59 40 -21 25 54 -0.27
111 41 16 -21 35 32 14 43 15.1 74 282 -62 111 57 8 -21 30 31 111 25 24 -21 40 31 112 17 49 -21 23 58 111 4 44 -21 46 59 -0.27
111 46 31 -21 56 35 14 43 28.3 73 283 -62 112 2 25 -21 51 33 111 30 36 -22 1 35 112 23 8 -21 44 59 111 9 54 -22 8 4 -0.27
111 51 50 -22 17 38 14 43 41.6 73 284 -62 112 7 47 -22 12 36 111 35 54 -22 22 39 112 28 33 -22 6 0 111 15 9 -22 29 9 -0.27
111 57 16 -22 38 41 14 43 54.8 73 285 -62 112 13 14 -22 33 38 111 41 17 -22 43 43 112 34 3 -22 27 2 111 20 29 -22 50 14 -0.27
112 2 46 -22 59 45 14 44 8.1 73 286 -62 112 18 47 -22 54 41 111 46 46 -23 4 47 112 39 39 -22 48 3 111 25 55 -23 11 19 -0.27
112 8 23 -23 20 48 14 44 21.3 73 287 -62 112 24 26 -23 15 43 111 52 20 -23 25 52 112 45 21 -23 9 5 111 31 26 -23 32 25 -0.27
112 14 5 -23 41 52 14 44 34.6 72 288 -62 112 30 11 -23 36 46 111 58 0 -23 46 56 112 51 8 -23 30 6 111 37 3 -23 53 31 -0.27
112 19 53 -24 2 56 14 44 47.8 72 289 -62 112 36 1 -23 57 50 112 3 46 -24 8 2 112 57 2 -23 51 9 111 42 46 -24 14 37 -0.27
112 25 47 -24 24 1 14 45 1.1 72 289 -62 112 41 57 -24 18 53 112 9 37 -24 29 7 113 3 1 -24 12 11 111 48 34 -24 35 44 -0.27
112 31 48 -24 45 6 14 45 14.3 72 290 -62 112 48 0 -24 39 57 112 15 35 -24 50 13 113 9 7 -24 33 14 111 54 29 -24 56 51 -0.27
112 37 54 -25 6 11 14 45 27.6 71 291 -62 112 54 9 -25 1 2 112 21 39 -25 11 19 113 15 19 -24 54 17 112 0 30 -25 17 59 -0.28
112 44 7 -25 27 17 14 45 40.9 71 292 -62 113 0 25 -25 22 6 112 27 50 -25 32 26 113 21 38 -25 15 20 112 6 37 -25 39 7 -0.28
112 50 26 -25 48 23 14 45 54.1 71 292 -62 113 6 47 -25 43 12 112 34 7 -25 53 33 113 28 3 -25 36 24 112 12 50 -26 0 16 -0.28
112 56 53 -26 9 30 14 46 7.4 70 293 -62 113 13 15 -26 4 17 112 40 30 -26 14 41 113 34 35 -25 57 28 112 19 10 -26 21 25 -0.28
113 3 26 -26 30 37 14 46 20.6 70 294 -62 113 19 51 -26 25 23 112 47 0 -26 35 50 113 41 14 -26 18 33 112 25 37 -26 42 34 -0.28
113 10 6 -26 51 45 14 46 33.9 70 294 -62 113 26 34 -26 46 30 112 53 38 -26 56 59 113 48 1 -26 39 38 112 32 11 -27 3 45 -0.28
113 16 53 -27 12 54 14 46 47.1 70 295 -62 113 33 24 -27 7 38 113 0 22 -27 18 8 113 54 54 -27 0 44 112 38 52 -27 24 56 -0.28
113 23 47 -27 34 3 14 47 0.4 69 296 -62 113 40 21 -27 28 46 113 7 14 -27 39 19 114 1 55 -27 21 51 112 45 40 -27 46 8 -0.28
113 30 49 -27 55 13 14 47 13.6 69 296 -62 113 47 26 -27 49 54 113 14 13 -28 0 30 114 9 4 -27 42 58 112 52 35 -28 7 20 -0.28
113 37 59 -28 16 23 14 47 26.9 69 297 -62 113 54 38 -28 11 4 113 21 20 -28 21 41 114 16 20 -28 4 6 112 59 38 -28 28 34 -0.28
113 45 17 -28 37 35 14 47 40.1 68 297 -62 114 1 59 -28 32 14 113 28 34 -28 42 54 114 23 44 -28 25 15 113 6 49 -28 49 48 -0.28
113 52 42 -28 58 47 14 47 53.4 68 298 -62 114 9 27 -28 53 25 113 35 57 -29 4 7 114 31 17 -28 46 24 113 14 8 -29 11 3 -0.28
114 0 16 -29 20 0 14 48 6.6 68 298 -62 114 17 4 -29 14 37 113 43 28 -29 25 22 114 38 57 -29 7 34 113 21 34 -29 32 19 -0.28
114 7 58 -29 41 14 14 48 19.9 68 299 -62 114 24 49 -29 35 49 113 51 7 -29 46 37 114 46 47 -29 28 45 113 29 9 -29 53 36 -0.29
114 15 49 -30 2 29 14 48 33.2 67 299 -62 114 32 43 -29 57 3 113 58 54 -30 7 53 114 54 45 -29 49 57 113 36 53 -30 14 54 -0.29
114 23 48 -30 23 44 14 48 46.4 67 300 -62 114 40 46 -30 18 17 114 6 51 -30 29 10 115 2 52 -30 11 9 113 44 45 -30 36 13 -0.29
114 31 57 -30 45 1 14 48 59.7 67 300 -62 114 48 58 -30 39 33 114 14 56 -30 50 28 115 11 8 -30 32 23 113 52 46 -30 57 33 -0.29
114 40 15 -31 6 19 14 49 12.9 66 300 -62 114 57 19 -31 0 49 114 23 10 -31 11 48 115 19 33 -30 53 37 114 0 56 -31 18 54 -0.29
114 48 42 -31 27 38 14 49 26.2 66 301 -62 115 5 50 -31 22 6 114 31 34 -31 33 8 115 28 9 -31 14 53 114 9 16 -31 40 16 -0.29
114 57 20 -31 48 58 14 49 39.4 66 301 -62 115 14 31 -31 43 25 114 40 8 -31 54 29 115 36 54 -31 36 9 114 17 45 -32 1 39 -0.29
115 6 7 -32 10 19 14 49 52.7 65 302 -62 115 23 21 -32 4 44 114 48 52 -32 15 52 115 45 49 -31 57 27 114 26 24 -32 23 3 -0.29
115 15 4 -32 31 41 14 50 5.9 65 302 -62 115 32 22 -32 26 5 114 57 45 -32 37 15 115 54 54 -32 18 46 114 35 13 -32 44 29 -0.29
115 24 12 -32 53 4 14 50 19.2 65 302 -62 115 41 34 -32 47 27 115 6 50 -32 58 40 116 4 10 -32 40 5 114 44 12 -33 5 56 -0.29
115 33 30 -33 14 29 14 50 32.4 64 303 -62 115 50 56 -33 8 50 115 16 5 -33 20 6 116 13 38 -33 1 26 114 53 22 -33 27 24 -0.29
115 43 0 -33 35 54 14 50 45.7 64 303 -62 116 0 29 -33 30 14 115 25 30 -33 41 34 116 23 16 -33 22 48 115 2 43 -33 48 54 -0.29
115 52 41 -33 57 21 14 50 58.9 64 303 -62 116 10 14 -33 51 39 115 35 8 -34 3 2 116 33 5 -33 44 11 115 12 15 -34 10 25 -0.29
116 2 33 -34 18 50 14 51 12.2 63 303 -62 116 20 10 -34 13 6 115 44 56 -34 24 32 116 43 7 -34 5 36 115 21 59 -34 31 57 -0.29
116 12 38 -34 40 19 14 51 25.5 63 304 -62 116 30 19 -34 34 34 115 54 57 -34 46 4 116 53 20 -34 27 1 115 31 54 -34 53 30 -0.29
116 22 55 -35 1 50 14 51 38.7 63 304 -62 116 40 40 -34 56 3 116 5 9 -35 7 37 117 3 46 -34 48 28 115 42 2 -35 15 6 -0.30
116 33 24 -35 23 23 14 51 52.0 62 304 -61 116 51 13 -35 17 33 116 15 35 -35 29 11 117 14 25 -35 9 56 115 52 22 -35 36 42 -0.30
116 44 6 -35 44 57 14 52 5.2 62 304 -61 117 1 59 -35 39 5 116 26 13 -35 50 47 117 25 17 -35 31 26 116 2 54 -35 58 20 -0.30
116 55 2 -36 6 32 14 52 18.5 61 305 -61 117 12 59 -36 0 39 116 37 4 -36 12 24 117 36 22 -35 52 57 116 13 40 -36 20 0 -0.30
117 6 11 -36 28 9 14 52 31.7 61 305 -61 117 24 13 -36 22 14 116 48 9 -36 34 2 117 47 41 -36 14 29 116 24 39 -36 41 41 -0.30
117 17 34 -36 49 47 14 52 45.0 61 305 -61 117 35 40 -36 43 50 116 59 28 -36 55 43 117 59 14 -36 36 3 116 35 53 -37 3 24 -0.30
117 29 12 -37 11 27 14 52 58.2 60 305 -61 117 47 22 -37 5 28 117 11 1 -37 17 24 118 11 2 -36 57 38 116 47 20 -37 25 8 -0.30
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