|
|
Updated: 2021 Jul 15, 17:50 UT
Event Rank : 95
(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 2021 Aug 29 UT, the 45 km diameter asteroid (1191) Alfaterna will occult a 11.6 mag star in the constellation Sagittarius for observers along a path across Queensland and north-eastern South Australia, passing over Ingham.
In the case of an occultation, the combined light of the asteroid and the star will drop by 4.12 mag to 15.67 mag (the magnitude of the asteroid) for at most 5.8 seconds.
This update is based on, 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 365-170995 by 1191 Alfaterna on 2021 Aug 29
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
147 20 8 -16 41 54 9 46 53.0 73 94 -25 147 32 11 -16 47 5 147 8 4 -16 36 42 147 42 45 -16 51 37 146 57 30 -16 32 8 -0.28
147 8 43 -17 1 55 9 46 58.2 73 93 -25 147 20 47 -17 7 7 146 56 39 -16 56 43 147 31 22 -17 11 39 146 46 3 -16 52 9 -0.28
146 57 14 -17 21 56 9 47 3.4 72 92 -25 147 9 19 -17 27 8 146 45 9 -17 16 43 147 19 55 -17 31 41 146 34 32 -17 12 8 -0.28
146 45 40 -17 41 56 9 47 8.6 72 91 -25 146 57 46 -17 47 9 146 33 33 -17 36 42 147 8 23 -17 51 42 146 22 56 -17 32 7 -0.28
146 34 0 -18 1 55 9 47 13.8 72 90 -25 146 46 8 -18 7 9 146 21 53 -17 56 41 146 56 45 -18 11 43 146 11 14 -17 52 5 -0.28
146 22 16 -18 21 54 9 47 19.0 72 89 -25 146 34 24 -18 27 8 146 10 7 -18 16 39 146 45 3 -18 31 43 145 59 28 -18 12 3 -0.28
146 10 25 -18 41 52 9 47 24.2 72 88 -24 146 22 35 -18 47 7 145 58 16 -18 36 37 146 33 15 -18 51 42 145 47 35 -18 32 0 -0.28
145 58 30 -19 1 50 9 47 29.4 72 87 -24 146 10 41 -19 7 5 145 46 19 -18 56 34 146 21 22 -19 11 41 145 35 38 -18 51 56 -0.28
145 46 29 -19 21 47 9 47 34.6 71 86 -24 145 58 41 -19 27 3 145 34 16 -19 16 31 146 9 23 -19 31 40 145 23 34 -19 11 52 -0.28
145 34 22 -19 41 44 9 47 39.8 71 85 -24 145 46 35 -19 47 1 145 22 8 -19 36 27 145 57 18 -19 51 38 145 11 25 -19 31 48 -0.28
145 22 9 -20 1 40 9 47 45.0 71 84 -24 145 34 24 -20 6 58 145 9 55 -19 56 22 145 45 8 -20 11 36 144 59 10 -19 51 43 -0.28
145 9 51 -20 21 36 9 47 50.2 71 84 -24 145 22 7 -20 26 55 144 57 35 -20 16 17 145 32 52 -20 31 33 144 46 49 -20 11 37 -0.28
144 57 26 -20 41 32 9 47 55.4 71 83 -23 145 9 43 -20 46 51 144 45 9 -20 36 12 145 20 30 -20 51 30 144 34 22 -20 31 31 -0.28
144 44 55 -21 1 27 9 48 0.6 70 82 -23 144 57 14 -21 6 47 144 32 37 -20 56 7 145 8 1 -21 11 27 144 21 49 -20 51 25 -0.28
144 32 18 -21 21 22 9 48 5.8 70 81 -23 144 44 38 -21 26 42 144 19 58 -21 16 1 144 55 27 -21 31 23 144 9 9 -21 11 18 -0.28
144 19 35 -21 41 16 9 48 11.0 70 80 -23 144 31 56 -21 46 38 144 7 13 -21 35 54 144 42 46 -21 51 19 143 56 23 -21 31 11 -0.28
144 6 45 -22 1 11 9 48 16.2 70 80 -23 144 19 7 -22 6 33 143 54 22 -21 55 48 144 29 58 -22 11 15 143 43 30 -21 51 4 -0.28
143 53 48 -22 21 5 9 48 21.4 69 79 -23 144 6 12 -22 26 28 143 41 24 -22 15 41 144 17 4 -22 31 10 143 30 31 -22 10 56 -0.28
143 40 44 -22 40 58 9 48 26.6 69 78 -22 143 53 10 -22 46 22 143 28 18 -22 35 34 144 4 3 -22 51 6 143 17 25 -22 30 48 -0.28
143 27 34 -23 0 52 9 48 31.8 69 78 -22 143 40 1 -23 6 17 143 15 6 -22 55 26 143 50 55 -23 11 1 143 4 11 -22 50 40 -0.28
143 14 16 -23 20 45 9 48 37.1 69 77 -22 143 26 44 -23 26 11 143 1 47 -23 15 19 143 37 40 -23 30 56 142 50 51 -23 10 32 -0.28
143 0 51 -23 40 38 9 48 42.3 68 76 -22 143 13 21 -23 46 5 142 48 21 -23 35 11 143 24 18 -23 50 51 142 37 23 -23 30 23 -0.28
142 47 18 -24 0 31 9 48 47.5 68 76 -22 142 59 50 -24 5 59 142 34 46 -23 55 3 143 10 49 -24 10 46 142 23 47 -23 50 15 -0.28
142 33 38 -24 20 24 9 48 52.7 68 75 -22 142 46 11 -24 25 53 142 21 5 -24 14 55 142 57 11 -24 30 40 142 10 4 -24 10 6 -0.28
142 19 50 -24 40 17 9 48 57.9 68 75 -21 142 32 25 -24 45 47 142 7 15 -24 34 47 142 43 27 -24 50 35 141 56 13 -24 29 57 -0.28
142 5 54 -25 0 10 9 49 3.1 67 74 -21 142 18 31 -25 5 40 141 53 18 -24 54 39 142 29 34 -25 10 30 141 42 14 -24 49 48 -0.28
141 51 50 -25 20 3 9 49 8.3 67 73 -21 142 4 28 -25 25 34 141 39 12 -25 14 30 142 15 33 -25 30 24 141 28 7 -25 9 38 -0.28
141 37 38 -25 39 55 9 49 13.5 67 73 -21 141 50 18 -25 45 28 141 24 58 -25 34 22 142 1 24 -25 50 19 141 13 52 -25 29 29 -0.28
141 23 17 -25 59 48 9 49 18.7 67 72 -21 141 35 59 -26 5 21 141 10 36 -25 54 13 141 47 6 -26 10 13 140 59 28 -25 49 20 -0.28
141 8 48 -26 19 40 9 49 23.9 66 72 -20 141 21 31 -26 25 15 140 56 5 -26 14 5 141 32 40 -26 30 8 140 44 55 -26 9 10 -0.28
140 54 10 -26 39 33 9 49 29.1 66 72 -20 141 6 55 -26 45 9 140 41 25 -26 33 57 141 18 5 -26 50 3 140 30 14 -26 29 1 -0.27
140 39 22 -26 59 26 9 49 34.3 66 71 -20 140 52 9 -27 5 3 140 26 36 -26 53 48 141 3 21 -27 9 58 140 15 23 -26 48 51 -0.27
140 24 26 -27 19 18 9 49 39.5 65 71 -20 140 37 14 -27 24 57 140 11 37 -27 13 40 140 48 28 -27 29 52 140 0 23 -27 8 42 -0.27
140 9 20 -27 39 11 9 49 44.7 65 70 -20 140 22 10 -27 44 51 139 56 29 -27 33 31 140 33 25 -27 49 47 139 45 14 -27 28 32 -0.27
139 54 4 -27 59 4 9 49 49.9 65 70 -19 140 6 56 -28 4 45 139 41 12 -27 53 23 140 18 13 -28 9 43 139 29 55 -27 48 23 -0.27
139 38 38 -28 18 57 9 49 55.1 64 69 -19 139 51 32 -28 24 39 139 25 44 -28 13 15 140 2 51 -28 29 38 139 14 25 -28 8 14 -0.27
139 23 3 -28 38 50 9 50 0.3 64 69 -19 139 35 59 -28 44 33 139 10 7 -28 33 6 139 47 19 -28 49 33 138 58 46 -28 28 4 -0.27
139 7 16 -28 58 43 9 50 5.5 64 69 -19 139 20 14 -29 4 28 138 54 18 -28 52 58 139 31 36 -29 9 29 138 42 56 -28 47 55 -0.27
138 51 20 -29 18 37 9 50 10.7 63 68 -19 139 4 20 -29 24 22 138 38 20 -29 12 50 139 15 43 -29 29 25 138 26 56 -29 7 46 -0.27
138 35 12 -29 38 30 9 50 15.9 63 68 -18 138 48 14 -29 44 17 138 22 10 -29 32 42 138 59 39 -29 49 20 138 10 44 -29 27 37 -0.27
138 18 53 -29 58 24 9 50 21.1 63 68 -18 138 31 57 -30 4 12 138 5 49 -29 52 35 138 43 25 -30 9 17 137 54 22 -29 47 28 -0.27
138 2 23 -30 18 17 9 50 26.3 63 67 -18 138 15 29 -30 24 7 137 49 17 -30 12 27 138 26 58 -30 29 13 137 37 48 -30 7 19 -0.27
137 45 41 -30 38 11 9 50 31.5 62 67 -18 137 58 49 -30 44 2 137 32 33 -30 32 20 138 10 20 -30 49 10 137 21 2 -30 27 11 -0.27
137 28 47 -30 58 5 9 50 36.7 62 67 -17 137 41 58 -31 3 58 137 15 37 -30 52 12 137 53 30 -31 9 6 137 4 4 -30 47 2 -0.27
137 11 41 -31 18 0 9 50 41.9 62 67 -17 137 24 54 -31 23 54 136 58 29 -31 12 5 137 36 28 -31 29 3 136 46 54 -31 6 54 -0.27
136 54 23 -31 37 54 9 50 47.2 61 66 -17 137 7 37 -31 43 50 136 41 8 -31 31 58 137 19 14 -31 49 1 136 29 32 -31 26 45 -0.27
136 36 51 -31 57 49 9 50 52.4 61 66 -17 136 50 8 -32 3 46 136 23 35 -31 51 51 137 1 47 -32 8 58 136 11 56 -31 46 37 -0.27
136 19 7 -32 17 44 9 50 57.6 60 66 -17 136 32 26 -32 23 42 136 5 48 -32 11 45 136 44 6 -32 28 56 135 54 7 -32 6 29 -0.27
136 1 9 -32 37 39 9 51 2.8 60 66 -16 136 14 30 -32 43 39 135 47 47 -32 31 38 136 26 12 -32 48 54 135 36 5 -32 26 21 -0.27
135 42 57 -32 57 34 9 51 8.0 60 65 -16 135 56 20 -33 3 36 135 29 33 -32 51 32 136 8 5 -33 8 52 135 17 49 -32 46 13 -0.27
135 24 30 -33 17 30 9 51 13.2 59 65 -16 135 37 56 -33 23 33 135 11 5 -33 11 26 135 49 43 -33 28 51 134 59 18 -33 6 6 -0.27
135 5 50 -33 37 25 9 51 18.4 59 65 -16 135 19 18 -33 43 30 134 52 21 -33 31 20 135 31 6 -33 48 50 134 40 33 -33 25 58 -0.27
134 46 54 -33 57 21 9 51 23.6 59 65 -15 135 0 24 -34 3 28 134 33 23 -33 51 14 135 12 15 -34 8 49 134 21 33 -33 45 51 -0.27
134 27 43 -34 17 17 9 51 28.8 58 65 -15 134 41 16 -34 23 26 134 14 10 -34 11 8 134 53 9 -34 28 48 134 2 17 -34 5 44 -0.27
134 8 16 -34 37 13 9 51 34.0 58 65 -15 134 21 51 -34 43 23 133 54 41 -34 31 2 134 33 46 -34 48 47 133 42 46 -34 25 36 -0.27
133 48 33 -34 57 10 9 51 39.2 58 64 -15 134 2 11 -35 3 22 133 34 55 -34 50 57 134 14 8 -35 8 47 133 22 58 -34 45 29 -0.27
133 28 33 -35 17 6 9 51 44.4 57 64 -14 133 42 14 -35 23 20 133 14 53 -35 10 51 133 54 13 -35 28 47 133 2 54 -35 5 22 -0.27
133 8 17 -35 37 3 9 51 49.6 57 64 -14 133 21 59 -35 43 18 132 54 34 -35 30 46 133 34 1 -35 48 47 132 42 33 -35 25 15 -0.27
132 47 42 -35 56 59 9 51 54.8 56 64 -14 133 1 28 -36 3 17 132 33 57 -35 50 41 133 13 32 -36 8 48 132 21 54 -35 45 8 -0.27
132 26 50 -36 16 56 9 52 0.0 56 64 -14 132 40 38 -36 23 16 132 13 2 -36 10 36 132 52 44 -36 28 48 132 0 57 -36 5 1 -0.27
132 5 40 -36 36 53 9 52 5.2 56 64 -13 132 19 30 -36 43 15 131 51 49 -36 30 30 132 31 38 -36 48 49 131 39 41 -36 24 54 -0.27
131 44 10 -36 56 50 9 52 10.4 55 64 -13 131 58 3 -37 3 13 131 30 17 -36 50 25 132 10 14 -37 8 49 131 18 6 -36 44 47 -0.27
131 22 21 -37 16 47 9 52 15.6 55 64 -13 131 36 16 -37 23 12 131 8 25 -37 10 20 131 48 29 -37 28 50 130 56 12 -37 4 40 -0.27
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]