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Updated: 2023 Jun 15, 05:09 UT
Event Rank : 94
(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 Aug 13 UT, the 60 km diameter asteroid (255) Oppavia will occult a 11.8 mag star in the constellation Scorpius for observers along a path across West Australia and Northern Territory.
In the case of an occultation, the combined light of the asteroid and the star will drop by 3.5 mag to 15.31 mag (the magnitude of the asteroid) for at most 10.4 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 277-099695 by 255 Oppavia on 2023 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
121 20 12 -36 59 1 15 14 18.8 44 255 -65 121 46 36 -37 2 19 120 54 0 -36 55 36 122 10 23 -37 5 8 120 30 45 -36 52 26 0.79
121 31 29 -36 39 10 15 14 25.1 44 254 -66 121 57 50 -36 42 24 121 5 19 -36 35 48 122 21 34 -36 45 10 120 42 7 -36 32 41 0.79
121 42 49 -36 19 14 15 14 31.4 44 254 -66 122 9 8 -36 22 25 121 16 43 -36 15 56 122 32 49 -36 25 8 120 53 33 -36 12 52 0.79
121 54 14 -35 59 15 15 14 37.7 43 254 -67 122 20 30 -36 2 22 121 28 11 -35 56 0 122 44 9 -36 5 1 121 5 3 -35 53 0 0.79
122 5 44 -35 39 11 15 14 43.9 43 253 -67 122 31 57 -35 42 14 121 39 43 -35 36 0 122 55 34 -35 44 51 121 16 38 -35 33 3 0.80
122 17 18 -35 19 4 15 14 50.2 43 253 -67 122 43 29 -35 22 3 121 51 20 -35 15 56 123 7 4 -35 24 36 121 28 16 -35 13 2 0.80
122 28 58 -34 58 51 15 14 56.5 43 252 -68 122 55 6 -35 1 47 122 3 1 -34 55 48 123 18 39 -35 4 16 121 40 0 -34 52 57 0.80
122 40 42 -34 38 35 15 15 2.8 42 252 -68 123 6 48 -34 41 26 122 14 47 -34 35 35 123 30 19 -34 43 52 121 51 48 -34 32 48 0.80
122 52 31 -34 18 13 15 15 9.1 42 252 -69 123 18 36 -34 21 1 122 26 39 -34 15 18 123 42 5 -34 23 23 122 3 41 -34 12 34 0.80
123 4 26 -33 57 47 15 15 15.4 42 251 -69 123 30 29 -34 0 31 122 38 35 -33 54 55 123 53 56 -34 2 50 122 15 39 -33 52 15 0.80
123 16 26 -33 37 16 15 15 21.7 42 251 -69 123 42 28 -33 39 56 122 50 37 -33 34 28 124 5 54 -33 42 11 122 27 43 -33 31 51 0.80
123 28 33 -33 16 40 15 15 28.0 41 251 -70 123 54 32 -33 19 16 123 2 45 -33 13 56 124 17 57 -33 21 27 122 39 52 -33 11 23 0.80
123 40 45 -32 55 59 15 15 34.2 41 250 -70 124 6 43 -32 58 30 123 14 58 -32 53 19 124 30 7 -33 0 38 122 52 6 -32 50 49 0.80
123 53 3 -32 35 12 15 15 40.5 41 250 -70 124 19 1 -32 37 39 123 27 18 -32 32 36 124 42 23 -32 39 43 123 4 27 -32 30 10 0.80
124 5 28 -32 14 20 15 15 46.8 40 250 -71 124 31 25 -32 16 42 123 39 44 -32 11 48 124 54 47 -32 18 42 123 16 53 -32 9 26 0.80
124 17 59 -31 53 22 15 15 53.1 40 249 -71 124 43 55 -31 55 40 123 52 16 -31 50 55 125 7 17 -31 57 36 123 29 26 -31 48 36 0.80
124 30 38 -31 32 18 15 15 59.4 40 249 -72 124 56 33 -31 34 31 124 4 55 -31 29 55 125 19 54 -31 36 23 123 42 6 -31 27 40 0.80
124 43 23 -31 11 7 15 16 5.7 39 249 -72 125 9 19 -31 13 16 124 17 41 -31 8 50 125 32 39 -31 15 4 123 54 52 -31 6 39 0.80
124 56 16 -30 49 51 15 16 12.0 39 248 -72 125 22 11 -30 51 55 124 30 34 -30 47 38 125 45 32 -30 53 39 124 7 45 -30 45 31 0.81
125 9 17 -30 28 28 15 16 18.3 39 248 -73 125 35 12 -30 30 28 124 43 34 -30 26 19 125 58 33 -30 32 6 124 20 46 -30 24 17 0.81
125 22 25 -30 6 58 15 16 24.5 38 248 -73 125 48 21 -30 8 53 124 56 43 -30 4 55 126 11 42 -30 10 27 124 33 54 -30 2 56 0.81
125 35 42 -29 45 22 15 16 30.8 38 247 -74 126 1 38 -29 47 11 125 9 59 -29 43 23 126 25 0 -29 48 41 124 47 10 -29 41 29 0.81
125 49 7 -29 23 38 15 16 37.1 38 247 -74 126 15 4 -29 25 22 125 23 23 -29 21 44 126 38 27 -29 26 47 125 0 34 -29 19 55 0.81
126 2 41 -29 1 47 15 16 43.4 37 247 -75 126 28 39 -29 3 26 125 36 56 -28 59 58 126 52 3 -29 4 46 125 14 7 -28 58 13 0.81
126 16 25 -28 39 48 15 16 49.7 37 246 -75 126 42 24 -28 41 21 125 50 39 -28 38 4 127 5 49 -28 42 36 125 27 48 -28 36 24 0.81
126 30 18 -28 17 41 15 16 56.0 37 246 -75 126 56 18 -28 19 9 126 4 30 -28 16 3 127 19 45 -28 20 19 125 41 39 -28 14 27 0.81
126 44 21 -27 55 25 15 17 2.3 36 246 -76 127 10 23 -27 56 48 126 18 32 -27 53 53 127 33 52 -27 57 52 125 55 39 -27 52 22 0.81
126 58 34 -27 33 1 15 17 8.5 36 245 -76 127 24 39 -27 34 18 126 32 43 -27 31 35 127 48 9 -27 35 17 126 9 49 -27 30 9 0.81
127 12 58 -27 10 29 15 17 14.8 36 245 -77 127 39 5 -27 11 39 126 47 5 -27 9 8 128 2 38 -27 12 33 126 24 9 -27 7 47 0.81
127 27 34 -26 47 47 15 17 21.1 35 245 -77 127 53 43 -26 48 51 127 1 38 -26 46 32 128 17 18 -26 49 39 126 38 40 -26 45 17 0.81
127 42 21 -26 24 55 15 17 27.4 35 245 -78 128 8 33 -26 25 53 127 16 22 -26 23 47 128 32 11 -26 26 35 126 53 21 -26 22 37 0.81
127 57 20 -26 1 53 15 17 33.7 34 244 -78 128 23 36 -26 2 45 127 31 18 -26 0 52 128 47 17 -26 3 21 127 8 15 -25 59 47 0.82
128 12 32 -25 38 42 15 17 40.0 34 244 -78 128 38 51 -25 39 26 127 46 27 -25 37 46 129 2 36 -25 39 56 127 23 20 -25 36 48 0.82
128 27 57 -25 15 19 15 17 46.3 34 244 -79 128 54 21 -25 15 56 128 1 48 -25 14 31 129 18 9 -25 16 20 127 38 38 -25 13 38 0.82
128 43 36 -24 51 45 15 17 52.6 33 243 -79 129 10 4 -24 52 15 128 17 23 -24 51 4 129 33 57 -24 52 32 127 54 10 -24 50 18 0.82
128 59 29 -24 28 0 15 17 58.8 33 243 -80 129 26 2 -24 28 22 128 33 12 -24 27 26 129 50 0 -24 28 32 128 9 54 -24 26 46 0.82
129 15 38 -24 4 2 15 18 5.1 32 243 -80 129 42 16 -24 4 16 128 49 15 -24 3 36 130 6 18 -24 4 19 128 25 54 -24 3 3 0.82
129 32 2 -23 39 52 15 18 11.4 32 243 -81 129 58 46 -23 39 58 129 5 34 -23 39 34 130 22 54 -23 39 53 128 42 8 -23 39 7 0.82
129 48 43 -23 15 28 15 18 17.7 32 242 -81 130 15 33 -23 15 26 129 22 9 -23 15 18 130 39 47 -23 15 13 128 58 38 -23 14 59 0.82
130 5 41 -22 50 51 15 18 24.0 31 242 -82 130 32 38 -22 50 39 129 39 1 -22 50 49 130 56 59 -22 50 18 129 15 24 -22 50 38 0.82
130 22 58 -22 25 59 15 18 30.3 31 242 -82 130 50 2 -22 25 38 129 56 10 -22 26 6 131 14 29 -22 25 9 129 32 27 -22 26 2 0.82
130 40 33 -22 0 52 15 18 36.6 30 242 -82 131 7 45 -22 0 22 130 13 37 -22 1 9 131 32 20 -21 59 43 129 49 49 -22 1 13 0.82
130 58 28 -21 35 29 15 18 42.8 30 241 -83 131 25 50 -21 34 48 130 31 25 -21 35 56 131 50 33 -21 34 0 130 7 29 -21 36 8 0.82
131 16 45 -21 9 49 15 18 49.1 29 241 -83 131 44 17 -21 8 58 130 49 33 -21 10 26 132 9 9 -21 8 0 130 25 29 -21 10 47 0.83
131 35 25 -20 43 51 15 18 55.4 29 241 -84 132 3 7 -20 42 49 131 8 3 -20 44 39 132 28 8 -20 41 40 130 43 51 -20 45 10 0.83
131 54 29 -20 17 35 15 19 1.7 28 241 -84 132 22 21 -20 16 21 131 26 56 -20 18 34 132 47 34 -20 15 1 131 2 35 -20 19 14 0.83
132 13 58 -19 50 59 15 19 8.0 28 240 -85 132 42 2 -19 49 32 131 46 14 -19 52 10 133 7 26 -19 48 1 131 21 43 -19 53 0 0.83
132 33 53 -19 24 2 15 19 14.3 27 240 -85 133 2 11 -19 22 22 132 5 57 -19 25 26 133 27 47 -19 20 39 131 41 16 -19 26 27 0.83
132 54 17 -18 56 43 15 19 20.6 27 240 -85 133 22 49 -18 54 49 132 26 7 -18 58 20 133 48 39 -18 52 53 132 1 15 -18 59 33 0.83
133 15 12 -18 29 1 15 19 26.9 26 240 -86 133 43 59 -18 26 52 132 46 47 -18 30 51 134 10 4 -18 24 42 132 21 43 -18 32 16 0.83
133 36 39 -18 0 53 15 19 33.1 26 239 -86 134 5 43 -17 58 29 133 7 59 -18 2 59 134 32 4 -17 56 4 132 42 41 -18 4 37 0.83
133 58 41 -17 32 19 15 19 39.4 25 239 -86 134 28 4 -17 29 37 133 29 43 -17 34 41 134 54 42 -17 26 56 133 4 11 -17 36 32 0.83
134 21 20 -17 3 16 15 19 45.7 25 239 -86 134 51 3 -17 0 16 133 52 4 -17 5 55 135 18 0 -16 57 18 133 26 15 -17 8 1 0.83
134 44 40 -16 33 42 15 19 52.0 24 239 -86 135 14 45 -16 30 23 134 15 3 -16 36 39 135 42 4 -16 27 7 133 48 57 -16 39 1 0.83
135 8 43 -16 3 35 15 19 58.3 23 239 -86 135 39 13 -15 59 55 134 38 43 -16 6 52 136 6 55 -15 56 19 134 12 18 -16 9 31 0.84
135 33 34 -15 32 52 15 20 4.6 23 238 -86 136 4 31 -15 28 49 135 3 9 -15 36 31 136 32 39 -15 24 51 134 36 23 -15 39 27 0.84
135 59 17 -15 1 30 15 20 10.9 22 238 -85 136 30 44 -14 57 2 135 28 24 -15 5 32 136 59 20 -14 52 41 135 1 15 -15 8 49 0.84
136 25 56 -14 29 25 15 20 17.1 21 238 -85 136 57 56 -14 24 30 135 54 33 -14 33 53 137 27 5 -14 19 42 135 26 58 -14 37 31 0.84
136 53 38 -13 56 34 15 20 23.4 21 238 -84 137 26 16 -13 51 9 136 21 40 -14 1 30 137 56 0 -13 45 52 135 53 37 -14 5 31 0.84
137 22 30 -13 22 51 15 20 29.7 20 238 -84 137 55 49 -13 16 52 136 49 53 -13 28 18 138 26 15 -13 11 3 136 21 17 -13 32 45 0.84
137 52 38 -12 48 10 15 20 36.0 19 237 -83 138 26 46 -12 41 34 137 19 18 -12 54 12 138 57 58 -12 35 8 136 50 6 -12 59 8 0.84
138 24 14 -12 12 25 15 20 42.3 18 237 -82 138 59 16 -12 5 6 137 50 4 -12 19 6 139 31 23 -11 57 59 137 20 11 -12 24 34 0.85
138 57 29 -11 35 27 15 20 48.6 18 237 -82 139 33 35 -11 27 19 138 22 21 -11 42 52 140 6 44 -11 19 24 137 51 42 -11 48 56 0.85
139 32 38 -10 57 5 15 20 54.9 17 237 -81 140 9 58 -10 48 1 138 56 23 -11 5 21 140 44 22 -10 39 10 138 24 50 -11 12 7 0.85
140 10 0 -10 17 7 15 21 1.2 16 237 -80 140 48 48 -10 6 56 139 32 26 -10 26 22 141 24 41 - 9 56 58 138 59 50 -10 33 56 0.85
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