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Updated: 2017 May 30, 03:37 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 2017 Jul 02 UT, the 100 km diameter asteroid (350) Ornamenta will occult a 12.3 mag star in the constellation Sagittarius for observers along a path across New Zealand, passing over Aucland and Dunedin.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.41 mag to 13.40 mag (the magnitude of the asteroid) for at most 6.2 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 2UCAC 17614878 by 350 Ornamenta on 2017 Jul 2
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
175 6 4 -34 11 3 18 46 58 27 246 -8 176 11 48 -33 59 19 174 1 57 -34 21 30 176 50 45 -33 51 52 173 25 28 -34 27 1 1.29
174 31 29 -35 15 23 18 47 4 28 246 -9 175 36 44 -35 4 28 173 27 46 -35 25 5 176 15 20 -34 57 32 172 51 27 -35 30 11 1.29
173 59 1 -36 18 30 18 47 10 28 247 -10 175 3 56 -36 8 18 172 55 32 -36 27 32 175 42 18 -36 1 50 172 19 20 -36 32 16 1.30
173 28 31 -37 20 32 18 47 16 29 248 -10 174 33 14 -37 10 59 172 25 9 -37 28 58 175 11 27 -37 4 55 171 49 0 -37 33 23 1.30
172 59 50 -38 21 37 18 47 22 30 249 -11 174 4 29 -38 12 39 171 56 30 -38 29 31 174 42 38 -38 6 56 171 20 19 -38 33 38 1.30
172 32 53 -39 21 50 18 47 28 30 249 -12 173 37 35 -39 13 23 171 29 27 -39 29 15 174 15 43 -39 7 59 170 53 13 -39 33 6 1.30
172 7 35 -40 21 16 18 47 34 31 250 -12 173 12 25 -40 13 17 171 3 58 -40 28 15 173 50 36 -40 8 10 170 27 36 -40 31 52 1.31
171 43 51 -41 19 59 18 47 40 32 251 -13 172 48 55 -41 12 25 170 39 58 -41 26 35 173 27 13 -41 7 34 170 3 26 -41 29 59 1.31
171 21 39 -42 18 4 18 47 46 32 252 -14 172 27 2 -42 10 53 170 17 25 -42 24 19 173 5 30 -42 6 16 169 40 40 -42 27 31 1.31
171 0 56 -43 15 35 18 47 52 33 252 -14 172 6 43 -43 8 44 169 56 16 -43 21 30 172 45 25 -43 4 18 169 19 16 -43 24 31 1.31
170 41 40 -44 12 33 18 47 59 33 253 -15 171 47 56 -44 6 1 169 36 30 -44 18 11 172 26 54 -44 1 46 168 59 11 -44 21 2 1.31
170 23 50 -45 9 3 18 48 5 34 254 -15 171 30 41 -45 2 46 169 18 5 -45 14 24 172 9 58 -44 58 42 168 40 26 -45 17 7 1.31
170 7 26 -46 5 6 18 48 11 34 255 -15 171 14 56 -45 59 4 169 1 1 -46 10 13 171 54 35 -45 55 8 168 22 59 -46 12 48 1.32
169 52 28 -47 0 45 18 48 17 34 255 -16 171 0 42 -46 54 56 168 45 19 -47 5 39 171 40 46 -46 51 8 168 6 51 -47 8 7 1.32
Uncertainty in time = +/- 3 secs
Prediction of 2017 May 30.0
Use these links for further information:
[Planetary Occultations]
[Using the Predictions]
[Observing Details]
[Timing Details]
[Reporting Details]
[Report Form]
[Asteroid Occultation Results]
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