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Updated: 2023 Jun 27, 04:30 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 17 UT, the 118 km diameter asteroid (203) Pompeja will occult a 12.2 mag star in the constellation Sagittarius for observers along a path across New Zealand, passing over Alexandra and Timaru and near Dunedin and Invercargill.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 13.64 mag (the magnitude of the asteroid) for at most 67.5 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 315-124712 by 203 Pompeja on 2023 Aug 17
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
169 28 56 -47 0 39 6 49 44.0 58 64 -10 170 21 23 -47 1 24 168 36 11 -46 59 37 170 39 49 -47 1 36 168 17 31 -46 59 10 -0.57
169 28 53 -46 40 25 6 50 4.7 58 64 -10 170 20 59 -46 41 9 168 36 30 -46 39 25 170 39 19 -46 41 20 168 17 57 -46 38 59 0.57
169 28 41 -46 20 13 6 50 25.4 58 65 -10 170 20 27 -46 20 55 168 36 39 -46 19 14 170 38 39 -46 21 6 168 18 13 -46 18 49 0.56
169 28 20 -46 0 3 6 50 46.2 58 65 -10 170 19 45 -46 0 43 168 36 38 -45 59 5 170 37 50 -46 0 53 168 18 20 -45 58 41 0.56
169 27 49 -45 39 54 6 51 6.9 58 65 -10 170 18 55 -45 40 33 168 36 27 -45 38 58 170 36 52 -45 40 42 168 18 16 -45 38 34 0.56
169 27 10 -45 19 47 6 51 27.6 59 66 -10 170 17 55 -45 20 24 168 36 7 -45 18 53 170 35 46 -45 20 33 168 18 3 -45 18 29 0.56
169 26 21 -44 59 41 6 51 48.3 59 66 -10 170 16 48 -45 0 17 168 35 38 -44 58 49 170 34 32 -45 0 26 168 17 41 -44 58 26 0.56
169 25 24 -44 39 37 6 52 9.0 59 67 -10 170 15 33 -44 40 12 168 35 0 -44 38 46 170 33 10 -44 40 20 168 17 9 -44 38 24 0.56
169 24 19 -44 19 35 6 52 29.7 59 67 -10 170 14 9 -44 20 8 168 34 13 -44 18 45 170 31 41 -44 20 16 168 16 29 -44 18 23 0.56
169 23 6 -43 59 34 6 52 50.4 59 68 -10 170 12 38 -44 0 6 168 33 18 -43 58 45 170 30 3 -44 0 14 168 15 40 -43 58 24 0.56
169 21 45 -43 39 34 6 53 11.2 60 68 -10 170 10 59 -43 40 5 168 32 15 -43 38 47 170 28 18 -43 40 12 168 14 43 -43 38 26 0.56
169 20 16 -43 19 36 6 53 31.9 60 68 -10 170 9 13 -43 20 6 168 31 3 -43 18 50 170 26 26 -43 20 13 168 13 38 -43 18 30 0.55
169 18 40 -42 59 39 6 53 52.6 60 69 -10 170 7 20 -43 0 8 168 29 44 -42 58 54 170 24 27 -43 0 15 168 12 24 -42 58 35 0.55
169 16 56 -42 39 44 6 54 13.3 60 69 -10 170 5 20 -42 40 12 168 28 17 -42 39 0 170 22 21 -42 40 18 168 11 3 -42 38 41 0.55
169 15 5 -42 19 50 6 54 34.0 60 70 -10 170 3 13 -42 20 17 168 26 42 -42 19 7 170 20 8 -42 20 22 168 9 34 -42 18 48 0.55
169 13 7 -41 59 57 6 54 54.7 60 70 -10 170 0 59 -42 0 23 168 25 1 -41 59 15 170 17 49 -42 0 28 168 7 58 -41 58 57 0.55
169 11 2 -41 40 5 6 55 15.4 60 71 -10 169 58 38 -41 40 30 168 23 11 -41 39 24 170 15 23 -41 40 35 168 6 15 -41 39 6 0.55
169 8 51 -41 20 14 6 55 36.1 61 71 -10 169 56 11 -41 20 39 168 21 15 -41 19 35 170 12 50 -41 20 43 168 4 24 -41 19 17 0.55
169 6 33 -41 0 25 6 55 56.9 61 72 -10 169 53 38 -41 0 48 168 19 12 -40 59 46 170 10 12 -41 0 53 168 2 26 -40 59 29 0.54
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