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Updated: 2021 Dec 31, 01:50 UT
Event Rank : 98
(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 Feb 18 UT, the 38 km diameter asteroid (136) Austria will occult a 11.7 mag star in the constellation Orion for observers along a path across New Zealand, passing over Westport during mid-evening twilight.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.4 mag to 13.91 mag (the magnitude of the asteroid) for at most 7.5 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 TYC 0735-01974-1 by 136 Austria on 2022 Feb 18
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
171 41 45 -46 49 27 8 42 12.9 33 5 -10 171 26 56 -46 49 43 171 56 33 -46 49 12 171 16 31 -46 49 54 172 6 57 -46 49 2 -0.10
171 42 52 -46 8 12 8 42 21.2 33 5 -11 171 28 15 -46 8 27 171 57 29 -46 7 57 171 17 57 -46 8 38 172 7 45 -46 7 48 -0.10
171 43 49 -45 27 41 8 42 29.5 34 5 -11 171 29 22 -45 27 55 171 58 15 -45 27 27 171 19 13 -45 28 6 172 8 24 -45 27 17 -0.10
171 44 37 -44 47 51 8 42 37.7 35 5 -11 171 30 20 -44 48 5 171 58 53 -44 47 38 171 20 18 -44 48 16 172 8 55 -44 47 29 -0.10
171 45 16 -44 8 41 8 42 46.0 35 5 -12 171 31 9 -44 8 55 171 59 23 -44 8 28 171 21 14 -44 9 5 172 9 18 -44 8 19 -0.10
171 45 48 -43 30 8 8 42 54.3 36 5 -12 171 31 50 -43 30 21 171 59 45 -43 29 55 171 22 1 -43 30 31 172 9 34 -43 29 46 -0.10
171 46 12 -42 52 9 8 43 2.6 37 5 -12 171 32 23 -42 52 23 172 0 0 -42 51 57 171 22 39 -42 52 32 172 9 43 -42 51 49 -0.10
171 46 29 -42 14 44 8 43 10.9 37 5 -13 171 32 48 -42 14 57 172 0 9 -42 14 32 171 23 11 -42 15 7 172 9 46 -42 14 24 -0.10
171 46 40 -41 37 51 8 43 19.2 38 5 -13 171 33 7 -41 38 4 172 0 12 -41 37 39 171 23 35 -41 38 13 172 9 44 -41 37 31 -0.10
171 46 45 -41 1 28 8 43 27.5 38 5 -13 171 33 20 -41 1 40 172 0 10 -41 1 16 171 23 53 -41 1 49 172 9 36 -41 1 8 -0.10
171 46 45 -40 25 33 8 43 35.7 39 5 -14 171 33 27 -40 25 45 172 0 2 -40 25 22 171 24 5 -40 25 54 172 9 23 -40 25 14 0.10
171 46 39 -39 50 5 8 43 44.0 40 5 -14 171 33 28 -39 50 17 171 59 50 -39 49 54 171 24 11 -39 50 26 172 9 6 -39 49 47 0.10
171 46 28 -39 15 4 8 43 52.3 40 5 -14 171 33 24 -39 15 15 171 59 33 -39 14 53 171 24 12 -39 15 24 172 8 44 -39 14 46 0.10
171 46 13 -38 40 27 8 44 0.6 41 5 -14 171 33 15 -38 40 38 171 59 11 -38 40 17 171 24 8 -38 40 47 172 8 18 -38 40 9 0.10
171 45 54 -38 6 14 8 44 8.9 41 5 -15 171 33 2 -38 6 25 171 58 46 -38 6 4 171 23 59 -38 6 34 172 7 48 -38 5 57 0.10
171 45 31 -37 32 24 8 44 17.2 42 5 -15 171 32 45 -37 32 35 171 58 16 -37 32 14 171 23 46 -37 32 43 172 7 15 -37 32 7 0.10
171 45 3 -36 58 56 8 44 25.5 42 5 -15 171 32 23 -36 59 7 171 57 43 -36 58 46 171 23 28 -36 59 15 172 6 38 -36 58 39 0.10
171 44 33 -36 25 49 8 44 33.8 43 5 -16 171 31 58 -36 25 59 171 57 7 -36 25 39 171 23 7 -36 26 7 172 5 58 -36 25 33 0.10
171 43 58 -35 53 2 8 44 42.0 44 5 -16 171 31 29 -35 53 12 171 56 28 -35 52 52 171 22 41 -35 53 20 172 5 15 -35 52 46 0.10
171 43 21 -35 20 34 8 44 50.3 44 5 -16 171 30 56 -35 20 44 171 55 45 -35 20 25 171 22 13 -35 20 52 172 4 28 -35 20 18 0.10
171 42 40 -34 48 25 8 44 58.6 45 5 -16 171 30 21 -34 48 35 171 55 0 -34 48 16 171 21 40 -34 48 43 172 3 40 -34 48 10 0.10
171 41 57 -34 16 34 8 45 6.9 45 5 -17 171 29 42 -34 16 44 171 54 12 -34 16 25 171 21 5 -34 16 51 172 2 48 -34 16 19 0.10
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