|
|
Updated: 2019 NOV 28, 03:42 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 2020 Jan 26 UT, the 121.1 km diameter asteroid (81) Terpsichore will occult a 11.6 mag star in the constellation Gemini for observers along a path across Australia from Mackay across central Queensland, southern Northern Territory, north-western South Australia and southern Western Australia to Esperence.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.03 mag to 12.07 mag (the magnitude of the asteroid) for at most 12.7 seconds.
This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, astrometry for the asteroid kindly provided by Bill Owen, 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, inparticular 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 617-041628 by 81 Terpsichore on 2020 Jan 26
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
115 21 55 -38 0 0 13 3 19.8 11 31 -15 113 41 1 117 5 30 113 14 35 117 33 33 1.26
116 42 25 -37 0 0 13 3 14.3 12 30 -17 115 0 44 118 26 57 114 34 7 118 55 17 1.27
118 5 18 -36 0 0 13 3 7.9 14 29 -18 116 22 38 119 51 1 115 55 46 120 19 43 1.28
119 30 49 -35 0 0 13 3 0.6 15 28 -20 117 46 55 121 17 59 117 19 46 121 47 6 1.29
120 59 14 -34 0 0 13 2 52.5 17 27 -21 119 13 50 122 48 9 118 46 20 123 17 48 1.30
122 30 53 -33 0 0 13 2 43.3 18 26 -23 120 43 42 124 21 55 120 15 45 124 52 12 1.30
124 6 9 -32 0 0 13 2 33.2 19 25 -25 122 16 49 125 59 44 121 48 22 126 30 45 1.31
125 45 30 -31 0 0 13 2 21.8 21 24 -26 123 53 36 127 42 7 123 24 31 128 14 2 1.31
127 29 30 -30 0 0 13 2 9.3 22 23 -28 125 34 31 129 29 45 125 4 42 130 2 46 1.31
129 18 48 -29 0 0 13 1 55.3 24 22 -30 127 20 8 131 23 30 126 49 26 131 57 50 1.31
131 14 19 -28 0 0 13 1 39.8 25 20 -32 129 11 10 133 24 26 128 39 25 134 0 26 1.31
133 17 10 -27 0 0 13 1 22.5 27 19 -33 131 8 32 135 34 3 130 35 29 136 12 7 1.31
Latitude Latitude Latitude Latitude
134 0 0 -26 40 0 13 1 16.3 27 18 -34 -25 38 36 -27 43 6 -25 22 32 -28 0 12 1.34
135 0 0 -26 12 46 13 1 7.5 28 17 -35 -25 11 52 -27 15 20 -24 55 55 -27 32 17 1.33
136 0 0 -25 46 28 13 0 58.6 29 17 -36 -24 46 2 -26 48 31 -24 30 12 -27 5 20 1.33
137 0 0 -25 21 4 13 0 49.4 29 16 -37 -24 21 6 -26 22 39 -24 5 23 -26 39 19 1.33
138 0 0 -24 56 36 13 0 40.2 30 15 -38 -23 57 3 -25 57 42 -23 41 27 -26 14 15 1.33
139 0 0 -24 33 2 13 0 30.8 31 14 -38 -23 33 53 -25 33 42 -23 18 23 -25 50 7 1.33
140 0 0 -24 10 22 13 0 21.3 31 13 -39 -23 11 37 -25 10 37 -22 56 13 -25 26 55 1.33
141 0 0 -23 48 36 13 0 11.6 32 12 -40 -22 50 14 -24 48 27 -22 34 55 -25 4 38 1.33
142 0 0 -23 27 44 13 0 1.9 32 12 -41 -22 29 43 -24 27 12 -22 14 30 -24 43 17 1.33
143 0 0 -23 7 46 12 59 52.1 33 11 -42 -22 10 4 -24 6 52 -21 54 56 -24 22 51 1.33
144 0 0 -22 48 41 12 59 42.1 33 10 -42 -21 51 18 -23 47 27 -21 36 15 -24 3 20 1.33
145 0 0 -22 30 29 12 59 32.1 34 9 -43 -21 33 24 -23 28 55 -21 18 25 -23 44 43 1.33
146 0 0 -22 13 9 12 59 22.0 34 8 -44 -21 16 22 -23 11 18 -21 1 27 -23 27 0 1.33
147 0 0 -21 56 43 12 59 11.9 35 7 -44 -21 0 11 -22 54 34 -20 45 21 -23 10 12 1.33
148 0 0 -21 41 8 12 59 1.6 35 6 -45 -20 44 52 -22 38 43 -20 30 5 -22 54 17 1.33
149 0 0 -21 26 26 12 58 51.3 35 5 -46 -20 30 24 -22 23 46 -20 15 41 -22 39 15 1.33
150 0 0 -21 12 36 12 58 41.0 36 4 -46 -20 16 47 -22 9 42 -20 2 7 -22 25 7 1.33
151 0 0 -20 59 38 12 58 30.6 36 3 -47 -20 4 1 -21 56 30 -19 49 24 -22 11 52 1.33
152 0 0 -20 47 31 12 58 20.2 36 2 -47 -19 52 5 -21 44 11 -19 37 32 -21 59 30 1.33
153 0 0 -20 36 16 12 58 9.7 36 1 -48 -19 41 1 -21 32 45 -19 26 30 -21 48 0 1.33
154 0 0 -20 25 52 12 57 59.2 36 0 -48 -19 30 47 -21 22 11 -19 16 19 -21 37 23 1.33
155 0 0 -20 16 19 12 57 48.7 37 359 -49 -19 21 23 -21 12 29 -19 6 57 -21 27 39 1.33
156 0 0 -20 7 38 12 57 38.2 37 358 -49 -19 12 49 -21 3 39 -18 58 25 -21 18 46 1.33
157 0 0 -19 59 47 12 57 27.6 37 357 -50 -19 5 6 -20 55 41 -18 50 44 -21 10 46 1.33
158 0 0 -19 52 48 12 57 17.1 37 356 -50 -18 58 13 -20 48 34 -18 43 52 -21 3 38 1.33
159 0 0 -19 46 39 12 57 6.5 37 355 -50 -18 52 9 -20 42 19 -18 37 50 -20 57 21 1.33
160 0 0 -19 41 21 12 56 56.0 37 354 -51 -18 46 56 -20 36 56 -18 32 38 -20 51 57 1.33
161 0 0 -19 36 53 12 56 45.5 37 353 -51 -18 42 32 -20 32 24 -18 28 15 -20 47 24 1.33
162 0 0 -19 33 16 12 56 34.9 37 352 -51 -18 38 58 -20 28 44 -18 24 42 -20 43 43 1.33
163 0 0 -19 30 30 12 56 24.5 37 351 -51 -18 36 14 -20 25 56 -18 21 59 -20 40 53 1.33
164 0 0 -19 28 34 12 56 14.0 37 350 -52 -18 34 20 -20 23 58 -18 20 5 -20 38 55 1.33
165 0 0 -19 27 29 12 56 3.6 36 349 -52 -18 33 16 -20 22 52 -18 19 1 -20 37 49 1.33
166 0 0 -19 27 15 12 55 53.2 36 348 -52 -18 33 1 -20 22 38 -18 18 46 -20 37 35 1.33
167 0 0 -19 27 51 12 55 42.8 36 347 -52 -18 33 36 -20 23 15 -18 19 21 -20 38 12 1.34
168 0 0 -19 29 17 12 55 32.5 36 346 -52 -18 35 1 -20 24 43 -18 20 46 -20 39 41 1.34
169 0 0 -19 31 35 12 55 22.3 36 345 -52 -18 37 16 -20 27 3 -18 23 0 -20 42 1 1.34
170 0 0 -19 34 43 12 55 12.1 35 344 -52 -18 40 21 -20 30 14 -18 26 4 -20 45 14 1.34
Uncertainty in time = +/- 3 secs
Prediction of 2019 Nov 28.0
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
[Timing Details]
[Reporting Details]
[Report Form]
[Asteroid Occultation Results]
[Top of Page][Return to Home Page]