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Updated: 2021 Nov 09, 04:50 UT
Event Rank : 96
(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 2021 Dec 28 UT, the 62 km diameter asteroid (1189) Terentia will occult a 11.6 mag star in the constellation Taurus for observers along a path across northern Queensland, passing over Cairns.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.7 mag to 14.28 mag (the magnitude of the asteroid) for at most 7.2 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 580-010238 by 1189 Terentia on 2021 Dec 28
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
133 19 8 -29 0 0 10 29 26.3 26 34 -5 132 52 12 133 46 4 132 29 53 134 8 20 0.29
134 21 36 -28 0 0 10 29 18.1 28 33 -6 133 54 57 134 48 15 133 32 52 135 10 18 0.29
135 23 23 -27 0 0 10 29 9.6 29 33 -8 134 56 59 135 49 47 134 35 8 136 11 37 0.29
136 24 33 -26 0 0 10 29 0.7 30 32 -9 135 58 23 136 50 43 135 36 44 137 12 21 0.29
137 25 10 -25 0 0 10 28 51.5 32 32 -10 136 59 14 137 51 7 136 37 46 138 12 35 0.29
138 25 19 -24 0 0 10 28 41.9 33 31 -11 137 59 34 138 51 4 137 38 17 139 12 22 0.29
139 25 3 -23 0 0 10 28 32.0 34 31 -13 138 59 29 139 50 37 138 38 21 140 11 46 0.29
140 24 26 -22 0 0 10 28 21.7 35 30 -14 139 59 2 140 49 50 139 38 2 141 10 51 0.29
141 23 31 -21 0 0 10 28 11.1 37 30 -15 140 58 16 141 48 46 140 37 23 142 9 41 0.29
142 22 22 -20 0 0 10 28 0.2 38 29 -17 141 57 15 142 47 29 141 36 29 143 8 17 0.29
143 21 1 -19 0 0 10 27 48.9 39 29 -18 142 56 2 143 46 2 142 35 22 144 6 44 0.29
144 19 33 -18 0 0 10 27 37.3 41 28 -19 143 54 40 144 44 28 143 34 5 145 5 5 0.29
145 18 0 -17 0 0 10 27 25.4 42 27 -20 144 53 12 145 42 50 144 32 42 146 3 23 0.29
146 16 25 -16 0 0 10 27 13.2 43 27 -22 145 51 42 146 41 11 145 31 15 147 1 41 0.29
147 14 52 -15 0 0 10 27 0.7 45 26 -23 146 50 11 147 39 34 146 29 48 148 0 1 0.29
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
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