|
|
Updated: 2017 MAY 01, 00:53 UT
Event Rank : 70
(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 Jun 20 UT, the 67 km diameter asteroid (977) Philippa will occult a 11.8 mag star in the constellation Piscis Austrinus for observers along a narrow path across eastern Australia, including Kangaroo Island, and across Adelaide, across eastern South Australia and western Queensland to near Karumba.
In the case of an occultation, the combined light of the asteroid and the star will drop by 3.35 mag to 15.10 mag (the magnitude of the asteroid) for at most 8.4 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.
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
131 27 13 - 1 20 16 14 20 2 9 117 -64 132 52 43 - 1 55 2 129 45 19 - 0 36 54 134 34 41 - 2 34 35 126 14 28 0 59 25 1.65
132 46 34 - 2 45 31 14 20 12 11 117 -66 134 0 32 - 3 14 12 131 23 14 - 2 11 53 135 32 1 - 3 48 11 129 1 48 - 1 11 37 1.74
133 50 9 - 4 2 29 14 20 22 13 117 -68 134 56 47 - 4 27 17 132 37 9 - 3 34 19 136 21 0 - 4 57 22 130 41 2 - 2 47 19 1.78
134 43 17 - 5 13 58 14 20 31 14 117 -69 135 44 48 - 5 36 1 133 37 3 - 4 49 23 137 3 39 - 6 3 12 131 55 7 - 4 9 53 1.80
135 28 48 - 6 21 26 14 20 41 15 116 -70 136 26 29 - 6 41 25 134 27 23 - 5 59 27 137 41 12 - 7 6 21 132 54 45 - 5 24 53 1.82
136 8 24 - 7 25 49 14 20 51 16 116 -72 137 3 9 - 7 44 11 135 10 37 - 7 5 47 138 14 33 - 8 7 17 133 44 38 - 6 34 48 1.83
136 43 15 - 8 27 42 14 21 1 17 116 -73 137 35 38 - 8 44 47 135 48 18 - 8 9 14 138 44 22 - 9 6 23 134 27 20 - 7 40 57 1.83
137 14 8 - 9 27 32 14 21 11 18 116 -74 138 4 35 - 9 43 32 136 21 27 - 9 10 19 139 11 6 -10 3 52 135 4 24 - 8 44 11 1.84
137 41 37 -10 25 37 14 21 21 19 115 -75 138 30 29 -10 40 42 136 50 48 -10 9 26 139 35 8 -10 59 59 135 36 54 - 9 45 3 1.84
138 6 9 -11 22 12 14 21 31 20 115 -76 138 53 41 -11 36 31 137 16 53 -11 6 54 139 56 45 -11 54 53 136 5 33 -10 43 57 1.85
138 28 5 -12 17 27 14 21 41 21 115 -77 139 14 28 -12 31 7 137 40 6 -12 2 54 140 16 12 -12 48 41 136 30 55 -11 41 10 1.85
138 47 40 -13 11 33 14 21 51 21 114 -78 139 33 6 -13 24 39 138 0 48 -12 57 39 140 33 40 -13 41 31 136 53 25 -12 36 57 1.85
139 5 8 -14 4 37 14 22 1 22 114 -79 139 49 44 -14 17 12 138 19 12 -13 51 16 140 49 19 -14 33 28 137 13 20 -13 31 28 1.85
139 20 39 -14 56 45 14 22 11 23 114 -80 140 4 32 -15 8 54 138 35 31 -14 43 54 141 3 16 -15 24 36 137 30 57 -14 24 52 1.85
139 34 21 -15 48 2 14 22 21 23 113 -81 140 17 38 -15 59 47 138 49 55 -15 35 36 141 15 38 -16 15 1 137 46 28 -15 17 15 1.85
139 46 23 -16 38 32 14 22 30 24 113 -82 140 29 9 -16 49 57 139 2 33 -16 26 30 141 26 31 -17 4 46 138 0 3 -16 8 44 1.84
139 56 51 -17 28 20 14 22 40 24 112 -82 140 39 9 -17 39 27 139 13 30 -17 16 38 141 35 59 -17 53 53 138 11 49 -16 59 24 1.84
140 5 48 -18 17 29 14 22 50 25 112 -83 140 47 44 -18 28 20 139 22 54 -18 6 5 141 44 6 -18 42 25 138 21 55 -17 49 18 1.84
140 13 20 -19 6 2 14 23 0 25 112 -84 140 54 56 -19 16 38 139 30 48 -18 54 53 141 50 56 -19 30 25 138 30 24 -18 38 31 1.84
140 19 31 -19 54 1 14 23 10 26 111 -84 141 0 50 -20 4 24 139 37 17 -19 43 6 141 56 31 -20 17 55 138 37 23 -19 27 5 1.84
140 24 22 -20 41 28 14 23 20 26 111 -85 141 5 29 -20 51 40 139 42 24 -20 30 46 142 0 53 -21 4 57 138 42 55 -20 15 4 1.84
140 27 57 -21 28 26 14 23 30 26 111 -85 141 8 53 -21 38 28 139 46 12 -21 17 54 142 4 6 -21 51 33 138 47 3 -21 2 29 1.83
140 30 18 -22 14 56 14 23 40 27 110 -86 141 11 6 -22 24 49 139 48 42 -22 4 34 142 6 9 -22 37 43 138 49 50 -21 49 24 1.83
140 31 27 -23 1 0 14 23 50 27 110 -86 141 12 8 -23 10 45 139 49 58 -22 50 46 142 7 5 -23 23 30 138 51 19 -22 35 49 1.83
140 31 24 -23 46 39 14 24 0 27 109 -86 141 12 1 -23 56 18 139 50 0 -23 36 32 142 6 55 -24 8 54 138 51 30 -23 21 46 -1.83
140 30 10 -24 31 55 14 24 10 28 109 -86 141 10 46 -24 41 28 139 48 49 -24 21 54 142 5 39 -24 53 57 138 50 25 -24 7 17 -1.83
140 27 47 -25 16 48 14 24 19 28 109 -86 141 8 23 -25 26 16 139 46 27 -25 6 52 142 3 17 -25 38 40 138 48 6 -24 52 23 -1.82
140 24 15 -26 1 19 14 24 29 28 108 -85 141 4 53 -26 10 44 139 42 54 -25 51 28 141 59 51 -26 23 3 138 44 33 -25 37 5 -1.82
140 19 34 -26 45 31 14 24 39 28 108 -85 141 0 15 -26 54 53 139 38 10 -26 35 42 141 55 19 -27 7 8 138 39 46 -26 21 24 -1.82
140 13 44 -27 29 22 14 24 49 28 108 -84 140 54 31 -27 38 42 139 32 15 -27 19 36 141 49 43 -27 50 55 138 33 45 -27 5 21 -1.82
140 6 44 -28 12 54 14 24 59 29 107 -84 140 47 38 -28 22 13 139 25 9 -28 3 9 141 43 1 -28 34 24 138 26 31 -27 48 57 -1.82
139 58 35 -28 56 8 14 25 9 29 107 -83 140 39 38 -29 5 26 139 16 51 -28 46 24 141 35 13 -29 17 37 138 18 3 -28 32 12 -1.81
139 49 15 -29 39 4 14 25 19 29 107 -82 140 30 28 -29 48 22 139 7 22 -29 29 19 141 26 18 -30 0 34 138 8 21 -29 15 7 -1.81
139 38 44 -30 21 42 14 25 29 29 106 -82 140 20 9 -30 31 1 138 56 39 -30 11 56 141 16 15 -30 43 15 137 57 23 -29 57 43 -1.81
139 27 0 -31 4 2 14 25 39 29 106 -81 140 8 38 -31 13 24 138 44 42 -30 54 15 141 5 3 -31 25 40 137 45 8 -30 39 59 -1.81
139 14 3 -31 46 6 14 25 49 29 106 -81 139 55 55 -31 55 31 138 31 30 -31 36 16 140 52 41 -32 7 50 137 31 35 -31 21 56 -1.81
138 59 50 -32 27 53 14 25 59 29 105 -80 139 41 59 -32 37 21 138 17 0 -32 17 59 140 39 7 -32 49 45 137 16 43 -32 3 34 -1.80
138 44 19 -33 9 23 14 26 9 29 105 -79 139 26 46 -33 18 55 138 1 12 -32 59 25 140 24 20 -33 31 24 137 0 29 -32 44 54 -1.80
138 27 30 -33 50 36 14 26 18 29 105 -78 139 10 16 -34 0 13 137 44 2 -33 40 33 140 8 16 -34 12 49 136 42 52 -33 25 54 -1.80
138 9 18 -34 31 33 14 26 28 29 105 -78 138 52 27 -34 41 16 137 25 30 -34 21 23 139 50 56 -34 53 59 136 23 50 -34 6 36 -1.80
137 49 43 -35 12 12 14 26 38 29 104 -77 138 33 14 -35 22 2 137 5 31 -35 1 55 139 32 15 -35 34 54 136 3 19 -34 46 58 -1.80
137 28 41 -35 52 34 14 26 48 29 104 -76 138 12 37 -36 2 31 136 44 4 -35 42 9 139 12 11 -36 15 34 135 41 17 -35 27 0 -1.80
137 6 10 -36 32 38 14 26 58 29 104 -76 137 50 32 -36 42 44 136 21 6 -36 22 5 138 50 41 -36 55 57 135 17 41 -36 6 43 -1.79
136 42 5 -37 12 24 14 27 8 29 104 -75 137 26 55 -37 22 39 135 56 32 -37 1 41 138 27 43 -37 36 5 134 52 27 -36 46 4 -1.79
136 16 23 -37 51 51 14 27 18 28 104 -74 137 1 44 -38 2 17 135 30 20 -37 40 57 138 3 12 -38 15 57 134 25 31 -37 25 4 -1.79
135 49 1 -38 30 59 14 27 28 28 104 -73 136 34 54 -38 41 36 135 2 25 -38 19 53 137 37 6 -38 55 31 133 56 50 -38 3 42 -1.79
135 19 54 -39 9 46 14 27 38 28 103 -73 136 6 21 -39 20 36 134 32 44 -38 58 27 137 9 19 -39 34 48 133 26 19 -38 41 57 -1.79
134 48 58 -39 48 12 14 27 48 28 103 -72 135 36 1 -39 59 16 134 1 10 -39 36 38 136 39 47 -40 13 46 132 53 52 -39 19 46 -1.79
134 16 7 -40 26 16 14 27 58 28 103 -71 135 3 48 -40 37 35 133 27 40 -40 14 25 136 8 26 -40 52 24 132 19 26 -39 57 10 -1.79
133 41 16 -41 3 55 14 28 7 27 103 -71 134 29 38 -41 15 31 132 52 7 -40 51 47 135 35 11 -41 30 41 131 42 53 -40 34 6 -1.79
.. .. .. .. .. .. .. .. .. .. .. .. 91 56 55 -48 53 48 ... .. .. .. .. .. 95 55 44 -50 58 53 ... .. .. .. .. .. ....
.. .. .. .. .. .. .. .. .. .. .. .. ... .. .. .. .. .. ... .. .. .. .. .. 91 13 52 -49 35 51 ... .. .. .. .. .. ....
Uncertainty in time = +/- 6 secs
Prediction of 2017 May 1.0
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]