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Updated: 2022 Jun 13, 20:48 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 2022 Aug 04 UT, the 121 km diameter asteroid (81) Terpsichore will occult a 10.4 mag star in the constellation Scorpius for observers along a path across New Zealand, passing over Wellington.
In the case of an occultation, the combined light of the asteroid and the star will drop by 3.8 mag to 14.21 mag (the magnitude of the asteroid) for at most 33.8 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 TYC 7349-02545-1 by 81 Terpsichore on 2022 Aug 4
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
177 3 54 -43 19 54 10 20 50.6 60 280 -54 176 20 35 -43 35 58 177 47 6 -43 3 36 175 57 34 -43 44 24 178 9 59 -42 54 52 -0.38
176 42 49 -43 0 50 10 21 1.9 60 280 -54 175 59 41 -43 16 48 177 25 52 -42 44 39 175 36 46 -43 25 10 177 48 39 -42 35 58 -0.38
176 22 3 -42 41 45 10 21 13.2 61 280 -54 175 39 5 -42 57 35 177 4 56 -42 25 40 175 16 15 -43 5 54 177 27 38 -42 17 2 -0.38
176 1 36 -42 22 37 10 21 24.4 61 279 -54 175 18 48 -42 38 21 176 44 18 -42 6 39 174 56 3 -42 46 37 177 6 56 -41 58 4 -0.38
175 41 25 -42 3 27 10 21 35.7 61 279 -54 174 58 47 -42 19 5 176 23 58 -41 47 35 174 36 8 -42 27 17 176 46 30 -41 39 4 -0.38
175 21 32 -41 44 16 10 21 47.0 61 279 -54 174 39 4 -41 59 48 176 3 55 -41 28 30 174 16 30 -42 7 57 176 26 22 -41 20 2 -0.38
175 1 56 -41 25 2 10 21 58.2 62 278 -54 174 19 37 -41 40 28 175 44 9 -41 9 23 173 57 9 -41 48 34 176 6 31 -41 0 58 -0.38
174 42 35 -41 5 47 10 22 9.5 62 278 -54 174 0 27 -41 21 8 175 24 39 -40 50 14 173 38 3 -41 29 10 175 46 56 -40 41 53 -0.38
174 23 31 -40 46 31 10 22 20.8 62 278 -54 173 41 32 -41 1 45 175 5 26 -40 31 3 173 19 14 -41 9 45 175 27 38 -40 22 45 -0.38
174 4 42 -40 27 12 10 22 32.0 62 277 -54 173 22 53 -40 42 21 174 46 28 -40 11 50 173 0 40 -40 50 18 175 8 35 -40 3 35 -0.38
173 46 9 -40 7 53 10 22 43.3 63 277 -54 173 4 29 -40 22 56 174 27 45 -39 52 36 172 42 21 -40 30 50 174 49 47 -39 44 24 -0.38
173 27 50 -39 48 31 10 22 54.6 63 276 -54 172 46 20 -40 3 29 174 9 17 -39 33 20 172 24 17 -40 11 20 174 31 15 -39 25 11 -0.38
173 9 47 -39 29 8 10 23 5.8 63 276 -54 172 28 25 -39 44 0 173 51 4 -39 14 2 172 6 27 -39 51 49 174 12 57 -39 5 56 -0.38
172 51 57 -39 9 43 10 23 17.1 63 276 -54 172 10 45 -39 24 31 173 33 5 -38 54 42 171 48 52 -39 32 16 173 54 53 -38 46 39 -0.38
172 34 21 -38 50 17 10 23 28.4 64 275 -54 171 53 18 -39 4 59 173 15 20 -38 35 21 171 31 30 -39 12 42 173 37 4 -38 27 21 -0.38
172 16 59 -38 30 50 10 23 39.7 64 275 -54 171 36 5 -38 45 27 172 57 49 -38 15 59 171 14 22 -38 53 7 173 19 28 -38 8 1 -0.38
171 59 50 -38 11 20 10 23 50.9 64 274 -54 171 19 5 -38 25 53 172 40 32 -37 56 35 170 57 26 -38 33 30 173 2 6 -37 48 39 -0.38
171 42 54 -37 51 50 10 24 2.2 64 274 -54 171 2 18 -38 6 18 172 23 27 -37 37 9 170 40 44 -38 13 52 172 44 57 -37 29 16 -0.38
171 26 11 -37 32 18 10 24 13.5 64 273 -54 170 45 43 -37 46 41 172 6 35 -37 17 42 170 24 14 -37 54 13 172 28 1 -37 9 52 -0.38
171 9 40 -37 12 45 10 24 24.7 65 273 -54 170 29 21 -37 27 3 171 49 56 -36 58 13 170 7 57 -37 34 33 172 11 17 -36 50 25 -0.38
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