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Updated: 2023 Jun 15, 05:10 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 Aug 15 UT, the 129 km diameter asteroid (393) Lampetia will occult a 11.8 mag star in the constellation Serpens for observers along a path across Northern Territory and South Australia, passing over Port Augusta, Whyalla, Adelaide and Kangaroo Island.
In the case of an occultation, the combined light of the asteroid and the star will drop by only 0.4 mag to 10.92 mag (the magnitude of the asteroid) for at most 26.3 seconds. This event may not be observable visually.
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 475-085818 by 393 Lampetia on 2023 Aug 15
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
138 20 31 -45 0 0 11 10 24.0 39 15 -34 137 28 25 139 12 25 137 8 56 139 31 44 0.34
138 18 40 -44 0 0 11 10 8.6 40 15 -34 137 27 27 139 9 41 137 8 17 139 28 42 0.34
138 16 31 -43 0 0 11 9 52.8 41 16 -35 137 26 9 139 6 43 137 7 17 139 25 25 0.34
138 14 5 -42 0 0 11 9 36.7 42 16 -35 137 24 30 139 3 30 137 5 56 139 21 54 0.34
138 11 22 -41 0 0 11 9 20.3 43 17 -35 137 22 32 139 0 2 137 4 15 139 18 10 0.34
138 8 24 -40 0 0 11 9 3.6 44 17 -35 137 20 16 138 56 21 137 2 15 139 14 13 0.34
138 5 9 -39 0 0 11 8 46.6 45 17 -35 137 17 42 138 52 27 136 59 57 139 10 4 0.34
138 1 40 -38 0 0 11 8 29.4 46 18 -35 137 14 51 138 48 20 136 57 20 139 5 42 0.34
137 57 57 -37 0 0 11 8 11.8 46 18 -35 137 11 44 138 44 0 136 54 26 139 1 9 0.34
137 53 58 -36 0 0 11 7 54.0 47 19 -35 137 8 20 138 39 27 136 51 16 138 56 24 0.34
137 49 46 -35 0 0 11 7 35.9 48 20 -35 137 4 41 138 34 43 136 47 48 138 51 27 0.34
137 45 20 -34 0 0 11 7 17.5 49 20 -35 137 0 46 138 29 46 136 44 5 138 46 19 0.35
137 40 41 -33 0 0 11 6 58.9 50 21 -35 136 56 36 138 24 37 136 40 6 138 40 59 0.35
137 35 48 -32 0 0 11 6 40.0 51 21 -35 136 52 10 138 19 16 136 35 51 138 35 28 0.35
137 30 41 -31 0 0 11 6 20.9 52 22 -35 136 47 30 138 13 44 136 31 21 138 29 46 0.35
137 25 22 -30 0 0 11 6 1.5 53 23 -35 136 42 35 138 7 59 136 26 35 138 23 52 0.35
137 19 49 -29 0 0 11 5 41.9 54 24 -35 136 37 26 138 2 3 136 21 34 138 17 47 0.35
137 14 2 -28 0 0 11 5 22.1 54 25 -35 136 32 1 137 55 54 136 16 18 138 11 30 0.35
137 8 2 -27 0 0 11 5 2.0 55 25 -35 136 26 22 137 49 33 136 10 47 138 5 1 0.35
137 1 49 -26 0 0 11 4 41.7 56 26 -35 136 20 29 137 43 0 136 5 0 137 58 21 0.35
136 55 22 -25 0 0 11 4 21.2 57 27 -35 136 14 20 137 36 15 135 58 59 137 51 28 0.35
136 48 41 -24 0 0 11 4 0.5 58 28 -34 136 7 56 137 29 16 135 52 42 137 44 24 0.36
136 41 46 -23 0 0 11 3 39.6 58 30 -34 136 1 18 137 22 5 135 46 9 137 37 6 0.36
136 34 37 -22 0 0 11 3 18.5 59 31 -34 135 54 24 137 14 41 135 39 21 137 29 36 0.36
136 27 13 -21 0 0 11 2 57.2 60 32 -34 135 47 14 137 7 3 135 32 16 137 21 53 0.36
136 19 34 -20 0 0 11 2 35.7 61 33 -33 135 39 49 136 59 11 135 24 56 137 13 57 0.36
136 11 41 -19 0 0 11 2 14.1 61 35 -33 135 32 7 136 51 6 135 17 19 137 5 47 0.36
136 3 32 -18 0 0 11 1 52.2 62 36 -33 135 24 9 136 42 46 135 9 25 136 57 22 0.36
135 55 7 -17 0 0 11 1 30.2 63 38 -32 135 15 54 136 34 11 135 1 14 136 48 44 0.37
135 46 26 -16 0 0 11 1 8.1 63 39 -32 135 7 23 136 25 20 134 52 45 136 39 50 0.37
135 37 28 -15 0 0 11 0 45.8 64 41 -32 134 58 33 136 16 15 134 43 59 136 30 41 0.37
135 28 14 -14 0 0 11 0 23.4 65 43 -31 134 49 26 136 6 52 134 34 54 136 21 16 0.37
135 18 41 -13 0 0 11 0 0.8 65 45 -31 134 40 0 135 57 14 134 25 31 136 11 35 0.37
135 8 51 -12 0 0 10 59 38.1 66 47 -31 134 30 15 135 47 18 134 15 48 136 1 36 0.37
134 58 41 -11 0 0 10 59 15.2 66 49 -30 134 20 10 135 37 4 134 5 45 135 51 21 0.38
134 48 13 -10 0 0 10 58 52.3 67 51 -30 134 9 45 135 26 31 133 55 21 135 40 47 0.38
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