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Updated: 2018 Jun 14, 23:47 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 2018 Aug 11 UT, the 154 km diameter asteroid (173) Ino will occult a 12.4 mag star in the constellation Pisces for observers along a path across Queensland, New South Wales, Victoria and Tasmania.
In the case of an occultation, the combined light of the asteroid and the star will drop by only 0.31 mag to 11.21 mag (the magnitude of the asteroid) for at most 23.1 seconds.This event may not be observable visually.
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 UCAC4-424-000282 by 173 Ino on 2018 Aug 11
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
150 23 44 -18 6 34 14 52 10 58 70 -78 151 13 58 -17 59 40 149 33 1 -18 13 24 151 35 59 -17 56 36 149 10 29 -18 16 24 0.58
150 23 28 -18 49 10 14 52 21 58 69 -78 151 13 55 -18 42 14 149 32 30 -18 56 1 151 36 3 -18 39 9 149 9 51 -18 59 1 -0.58
150 22 53 -19 31 52 14 52 33 58 68 -77 151 13 35 -19 24 55 149 31 40 -19 38 44 151 35 49 -19 21 50 149 8 54 -19 41 45 -0.58
150 22 0 -20 14 42 14 52 45 57 67 -77 151 12 58 -20 7 43 149 30 31 -20 21 36 151 35 18 -20 4 37 149 7 38 -20 24 37 -0.58
150 20 47 -20 57 39 14 52 56 57 66 -77 151 12 2 -20 50 40 149 29 2 -21 4 35 151 34 30 -20 47 33 149 6 1 -21 7 37 -0.58
150 19 16 -21 40 46 14 53 8 57 64 -77 151 10 48 -21 33 44 149 27 12 -21 47 43 151 33 23 -21 30 37 149 4 4 -21 50 45 -0.58
150 17 24 -22 24 1 14 53 19 57 63 -76 151 9 15 -22 16 58 149 25 2 -22 30 59 151 31 58 -22 13 50 149 1 45 -22 34 3 -0.58
150 15 13 -23 7 26 14 53 31 56 63 -76 151 7 22 -23 0 21 149 22 31 -23 14 26 151 30 14 -22 57 12 148 59 5 -23 17 30 -0.58
150 12 40 -23 51 1 14 53 43 56 62 -75 151 5 10 -23 43 54 149 19 38 -23 58 2 151 28 11 -23 40 45 148 56 2 -24 1 7 -0.58
150 9 47 -24 34 46 14 53 54 56 61 -75 151 2 38 -24 27 38 149 16 22 -24 41 49 151 25 48 -24 24 27 148 52 37 -24 44 55 -0.58
150 6 31 -25 18 42 14 54 6 55 60 -75 150 59 45 -25 11 32 149 12 44 -25 25 47 151 23 4 -25 8 21 148 48 48 -25 28 54 -0.57
150 2 53 -26 2 50 14 54 18 55 59 -74 150 56 30 -25 55 39 149 8 41 -26 9 57 151 19 59 -25 52 27 148 44 34 -26 13 4 -0.57
149 58 51 -26 47 11 14 54 29 54 58 -74 150 52 53 -26 39 57 149 4 14 -26 54 20 151 16 33 -26 36 44 148 39 56 -26 57 27 -0.57
149 54 25 -27 31 44 14 54 41 54 57 -73 150 48 52 -27 24 28 148 59 21 -27 38 55 151 12 44 -27 21 14 148 34 51 -27 42 3 -0.57
149 49 33 -28 16 31 14 54 52 54 56 -73 150 44 28 -28 9 13 148 54 1 -28 23 44 151 8 31 -28 5 58 148 29 18 -28 26 53 -0.57
149 44 16 -29 1 32 14 55 4 53 56 -72 150 39 39 -28 54 12 148 48 14 -29 8 47 151 3 55 -28 50 56 148 23 18 -29 11 57 -0.57
149 38 31 -29 46 47 14 55 16 53 55 -72 150 34 24 -29 39 25 148 41 58 -29 54 4 150 58 53 -29 36 9 148 16 48 -29 57 16 -0.57
149 32 17 -30 32 19 14 55 27 52 54 -71 150 28 43 -30 24 55 148 35 12 -30 39 38 150 53 25 -30 21 37 148 9 47 -30 42 50 -0.57
149 25 34 -31 18 7 14 55 39 52 53 -70 150 22 33 -31 10 40 148 27 55 -31 25 28 150 47 29 -31 7 21 148 2 14 -31 28 41 -0.57
149 18 19 -32 4 12 14 55 51 51 53 -70 150 15 53 -31 56 42 148 20 4 -32 11 35 150 41 5 -31 53 23 147 54 7 -32 14 50 -0.57
149 10 32 -32 50 34 14 56 2 51 52 -69 150 8 43 -32 43 3 148 11 38 -32 58 1 150 34 10 -32 39 42 147 45 24 -33 1 16 -0.57
149 2 10 -33 37 16 14 56 14 50 51 -69 150 1 0 -33 29 42 148 2 36 -33 44 45 150 26 44 -33 26 20 147 36 4 -33 48 1 -0.57
148 53 12 -34 24 18 14 56 26 50 51 -68 149 52 42 -34 16 41 147 52 56 -34 31 49 150 18 45 -34 13 17 147 26 4 -34 35 6 -0.57
148 43 35 -35 11 40 14 56 37 49 50 -67 149 43 49 -35 4 0 147 42 34 -35 19 14 150 10 10 -35 0 35 147 15 23 -35 22 32 -0.57
148 33 18 -35 59 23 14 56 49 48 50 -67 149 34 17 -35 51 41 147 31 29 -36 7 0 150 0 57 -35 48 15 147 3 57 -36 10 20 -0.57
148 22 17 -36 47 30 14 57 0 48 49 -66 149 24 4 -36 39 44 147 19 39 -36 55 9 149 51 6 -36 36 17 146 51 43 -36 58 30 -0.57
148 10 30 -37 36 0 14 57 12 47 49 -65 149 13 9 -37 28 11 147 6 59 -37 43 42 149 40 32 -37 24 43 146 38 39 -37 47 4 -0.57
147 57 54 -38 24 55 14 57 24 47 48 -65 149 1 27 -38 17 4 146 53 27 -38 32 40 149 29 13 -38 13 33 146 24 42 -38 36 4 -0.57
147 44 26 -39 14 17 14 57 35 46 48 -64 148 48 56 -39 6 22 146 38 59 -39 22 5 149 17 7 -39 2 50 146 9 47 -39 25 29 -0.57
147 30 1 -40 4 5 14 57 47 45 47 -63 148 35 32 -39 56 7 146 23 31 -40 11 57 149 4 9 -39 52 34 145 53 51 -40 15 23 -0.56
147 14 36 -40 54 23 14 57 59 45 47 -63 148 21 11 -40 46 22 146 6 59 -41 2 18 148 50 16 -40 42 47 145 36 47 -41 5 45 -0.56
146 58 5 -41 45 12 14 58 10 44 47 -62 148 5 50 -41 37 7 145 49 17 -41 53 9 148 35 25 -41 33 30 145 18 33 -41 56 38 -0.56
146 40 24 -42 36 32 14 58 22 43 46 -61 147 49 22 -42 28 23 145 30 19 -42 44 33 148 19 29 -42 24 45 144 59 0 -42 48 3 -0.56
146 21 27 -43 28 26 14 58 33 42 46 -61 147 31 44 -43 20 13 145 10 0 -43 36 30 148 2 24 -43 16 34 144 38 4 -43 40 2 -0.56
146 1 6 -44 20 55 14 58 45 42 46 -60 147 12 48 -44 12 39 144 48 11 -44 29 3 147 44 4 -44 8 58 144 15 35 -44 32 36 -0.56
Uncertainty in time = +/- 5 secs
Prediction of 2018 Jun 14.0
Use these links for further information:
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