|
|
Updated: 2017 Dec 15, 17:01 UT
Event Rank : 80
(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 2018 Jan 10 UT, the 52 km diameter asteroid (1113) Katja will occult a 11.4 mag star in the constellation Auriga for observers along a path across south-east Queensland and eastern New South Wales during evening twilight.
In the case of an occultation, the combined light of the asteroid and the star will drop by 2.16 mag to 13.40 mag (the magnitude of the asteroid) for at most 5.5 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, 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 2896-00219-1 by 1113 Katja on 2018 Jan 10
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
147 18 33 -36 0 0 9 52 13 9 26 -5 146 57 13 147 39 54 146 34 34 148 2 34 0.35
147 59 31 -35 0 0 9 52 10 10 25 -6 147 38 25 148 20 36 147 16 2 148 43 1 0.36
148 40 5 -34 0 0 9 52 8 11 25 -7 148 19 14 149 0 57 147 57 5 149 23 7 0.36
149 20 20 -33 0 0 9 52 5 12 24 -8 148 59 42 149 40 59 148 37 48 150 2 56 0.37
150 0 18 -32 0 0 9 52 2 13 24 -9 149 39 52 150 20 45 149 18 11 150 42 29 0.37
150 40 2 -31 0 0 9 51 58 15 24 -10 150 19 47 151 0 17 149 58 18 151 21 48 0.37
151 19 32 -30 0 0 9 51 54 16 23 -11 150 59 28 151 39 37 150 38 11 152 0 57 0.37
151 58 53 -29 0 0 9 51 50 17 23 -12 151 38 59 152 18 48 151 17 52 152 39 57 0.38
152 38 5 -28 0 0 9 51 46 18 23 -13 152 18 21 152 57 51 151 57 24 153 18 51 0.38
153 17 11 -27 0 0 9 51 42 19 22 -14 152 57 35 153 36 48 152 36 48 153 57 39 0.38
153 56 13 -26 0 0 9 51 37 20 22 -15 153 36 45 154 15 42 153 16 6 154 36 25 0.38
154 35 13 -25 0 0 9 51 32 21 22 -16 154 15 53 154 54 35 153 55 21 155 15 10 0.38
155 14 12 -24 0 0 9 51 26 23 21 -17 154 54 59 155 33 27 154 34 34 155 53 55 0.38
Uncertainty in time = +/- 4 secs
Prediction of 2017 Dec 15.0
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]