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Updated: 2022 Jun 29, 05:39 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 2022 Aug 18 UT, the 72 km diameter asteroid (1796) Riga will occult a 12.5 mag star in the constellation Serpens for observers along a path across north-western Queensland, eastern Northern Territory and central South Australia.
In the case of an occultation, the combined light of the asteroid and the star will drop by 3.0 mag to 15.40 mag (the magnitude of the asteroid) for at most 6.7 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 TYC 0441-00921-1 by 1796 Riga on 2022 Aug 18
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
140 36 36 - 9 52 20 11 54 53.3 73 328 -49 140 56 9 - 9 57 51 140 17 5 - 9 46 51 141 9 9 -10 1 31 140 4 8 - 9 43 12 0.23
140 30 24 -10 14 38 11 54 57.2 72 329 -49 140 49 59 -10 20 9 140 10 51 -10 9 7 141 2 59 -10 23 49 139 57 54 -10 5 29 0.23
140 24 13 -10 36 57 11 55 1.0 72 330 -49 140 43 49 -10 42 29 140 4 38 -10 31 27 140 56 50 -10 46 9 139 51 40 -10 27 48 0.23
140 18 2 -10 59 19 11 55 4.8 72 330 -49 140 37 39 -11 4 51 139 58 26 -10 53 48 140 50 42 -11 8 32 139 45 27 -10 50 9 0.23
140 11 52 -11 21 44 11 55 8.7 71 331 -49 140 31 31 -11 27 16 139 52 15 -11 16 12 140 44 35 -11 30 57 139 39 15 -11 12 33 0.23
140 5 43 -11 44 11 11 55 12.5 71 332 -49 140 25 24 -11 49 44 139 46 5 -11 38 39 140 38 28 -11 53 25 139 33 3 -11 34 59 0.23
139 59 35 -12 6 41 11 55 16.4 71 333 -49 140 19 17 -12 12 14 139 39 54 -12 1 9 140 32 23 -12 15 56 139 26 52 -11 57 28 0.23
139 53 27 -12 29 14 11 55 20.2 71 333 -49 140 13 11 -12 34 47 139 33 45 -12 23 41 140 26 17 -12 38 30 139 20 42 -12 20 0 0.23
139 47 20 -12 51 49 11 55 24.0 70 334 -49 140 7 5 -12 57 23 139 27 36 -12 46 16 140 20 13 -13 1 6 139 14 32 -12 42 35 0.23
139 41 13 -13 14 27 11 55 27.9 70 335 -49 140 1 0 -13 20 2 139 21 28 -13 8 53 140 14 9 -13 23 45 139 8 22 -13 5 12 0.23
139 35 7 -13 37 9 11 55 31.7 70 335 -49 139 54 56 -13 42 44 139 15 20 -13 31 34 140 8 6 -13 46 27 139 2 13 -13 27 52 0.23
139 29 1 -13 59 53 11 55 35.5 69 336 -49 139 48 52 -14 5 29 139 9 12 -13 54 18 140 2 4 -14 9 13 138 56 4 -13 50 36 0.23
139 22 56 -14 22 41 11 55 39.4 69 337 -49 139 42 49 -14 28 17 139 3 5 -14 17 5 139 56 2 -14 32 1 138 49 56 -14 13 22 0.23
139 16 51 -14 45 31 11 55 43.2 69 337 -48 139 36 46 -14 51 9 138 56 59 -14 39 55 139 50 1 -14 54 53 138 43 48 -14 36 12 0.24
139 10 47 -15 8 25 11 55 47.1 68 338 -48 139 30 44 -15 14 3 138 50 52 -15 2 48 139 44 0 -15 17 48 138 37 40 -14 59 5 0.24
139 4 43 -15 31 23 11 55 50.9 68 338 -48 139 24 42 -15 37 1 138 44 46 -15 25 45 139 38 0 -15 40 46 138 31 33 -15 22 1 0.24
138 58 40 -15 54 23 11 55 54.7 68 339 -48 139 18 41 -16 0 3 138 38 41 -15 48 45 139 32 0 -16 3 48 138 25 26 -15 45 1 0.24
138 52 36 -16 17 28 11 55 58.6 67 340 -48 139 12 40 -16 23 8 138 32 35 -16 11 49 139 26 0 -16 26 54 138 19 19 -16 8 4 0.24
138 46 33 -16 40 36 11 56 2.4 67 340 -48 139 6 39 -16 46 17 138 26 30 -16 34 56 139 20 1 -16 50 3 138 13 12 -16 31 11 0.24
138 40 31 -17 3 48 11 56 6.2 67 341 -48 139 0 39 -17 9 29 138 20 25 -16 58 7 139 14 3 -17 13 16 138 7 5 -16 54 21 0.24
138 34 28 -17 27 3 11 56 10.1 66 341 -48 138 54 39 -17 32 45 138 14 20 -17 21 22 139 8 4 -17 36 33 138 0 58 -17 17 36 0.24
138 28 26 -17 50 23 11 56 13.9 66 342 -48 138 48 39 -17 56 6 138 8 15 -17 44 40 139 2 6 -17 59 54 137 54 52 -17 40 54 0.24
138 22 24 -18 13 46 11 56 17.8 66 342 -48 138 42 40 -18 19 30 138 2 10 -18 8 3 138 56 8 -18 23 19 137 48 45 -18 4 16 0.24
138 16 21 -18 37 14 11 56 21.6 65 342 -48 138 36 40 -18 42 58 137 56 5 -18 31 30 138 50 11 -18 46 48 137 42 39 -18 27 42 0.24
138 10 19 -19 0 45 11 56 25.4 65 343 -48 138 30 41 -19 6 31 137 50 0 -18 55 1 138 44 13 -19 10 21 137 36 32 -18 51 12 0.24
138 4 17 -19 24 21 11 56 29.3 65 343 -48 138 24 42 -19 30 8 137 43 55 -19 18 36 138 38 16 -19 33 58 137 30 25 -19 14 47 0.24
137 58 15 -19 48 2 11 56 33.1 64 344 -47 138 18 42 -19 53 49 137 37 50 -19 42 15 138 32 19 -19 57 40 137 24 19 -19 38 26 0.24
137 52 13 -20 11 47 11 56 36.9 64 344 -47 138 12 43 -20 17 35 137 31 45 -20 6 0 138 26 22 -20 21 27 137 18 11 -20 2 9 0.24
137 46 11 -20 35 37 11 56 40.8 64 345 -47 138 6 44 -20 41 26 137 25 40 -20 29 48 138 20 25 -20 45 18 137 12 4 -20 25 58 0.24
137 40 8 -20 59 31 11 56 44.6 63 345 -47 138 0 45 -21 5 21 137 19 34 -20 53 42 138 14 27 -21 9 14 137 5 57 -20 49 50 0.24
137 34 6 -21 23 30 11 56 48.5 63 345 -47 137 54 46 -21 29 22 137 13 29 -21 17 40 138 8 30 -21 33 15 136 59 49 -21 13 48 0.24
137 28 3 -21 47 35 11 56 52.3 63 346 -47 137 48 46 -21 53 27 137 7 23 -21 41 43 138 2 33 -21 57 21 136 53 40 -21 37 51 0.24
137 22 0 -22 11 44 11 56 56.1 62 346 -47 137 42 47 -22 17 37 137 1 16 -22 5 52 137 56 36 -22 21 33 136 47 32 -22 1 58 0.24
137 15 57 -22 35 59 11 57 0.0 62 346 -47 137 36 47 -22 41 53 136 55 9 -22 30 5 137 50 39 -22 45 49 136 41 23 -22 26 11 0.24
137 9 53 -23 0 19 11 57 3.8 61 347 -47 137 30 47 -23 6 14 136 49 2 -22 54 24 137 44 41 -23 10 11 136 35 13 -22 50 29 0.24
137 3 49 -23 24 44 11 57 7.6 61 347 -47 137 24 47 -23 30 41 136 42 55 -23 18 48 137 38 43 -23 34 38 136 29 3 -23 14 53 0.24
136 57 45 -23 49 15 11 57 11.5 61 347 -46 137 18 46 -23 55 13 136 36 46 -23 43 18 137 32 45 -23 59 12 136 22 52 -23 39 22 0.24
136 51 40 -24 13 52 11 57 15.3 60 348 -46 137 12 45 -24 19 51 136 30 37 -24 7 54 137 26 47 -24 23 50 136 16 41 -24 3 57 0.24
136 45 34 -24 38 35 11 57 19.2 60 348 -46 137 6 44 -24 44 35 136 24 28 -24 32 35 137 20 48 -24 48 35 136 10 29 -24 28 37 0.24
136 39 28 -25 3 24 11 57 23.0 59 348 -46 137 0 42 -25 9 26 136 18 18 -24 57 23 137 14 49 -25 13 26 136 4 16 -24 53 24 0.24
136 33 22 -25 28 19 11 57 26.8 59 349 -46 136 54 39 -25 34 22 136 12 7 -25 22 17 137 8 49 -25 38 24 135 58 2 -25 18 17 0.24
136 27 14 -25 53 20 11 57 30.7 59 349 -46 136 48 36 -25 59 25 136 5 55 -25 47 17 137 2 49 -26 3 27 135 51 48 -25 43 16 0.24
136 21 6 -26 18 28 11 57 34.5 58 349 -46 136 42 33 -26 24 34 135 59 43 -26 12 23 136 56 49 -26 28 38 135 45 33 -26 8 22 0.24
136 14 57 -26 43 43 11 57 38.3 58 350 -45 136 36 29 -26 49 50 135 53 30 -26 37 37 136 50 47 -26 53 55 135 39 16 -26 33 34 0.24
136 8 48 -27 9 4 11 57 42.2 57 350 -45 136 30 24 -27 15 13 135 47 15 -27 2 57 136 44 46 -27 19 19 135 32 59 -26 58 53 0.24
136 2 37 -27 34 33 11 57 46.0 57 350 -45 136 24 18 -27 40 44 135 41 0 -27 28 24 136 38 43 -27 44 50 135 26 40 -27 24 19 0.24
135 56 26 -28 0 9 11 57 49.9 57 350 -45 136 18 11 -28 6 21 135 34 43 -27 53 58 136 32 40 -28 10 29 135 20 21 -27 49 52 0.24
135 50 13 -28 25 52 11 57 53.7 56 351 -45 136 12 4 -28 32 6 135 28 26 -28 19 40 136 26 36 -28 36 15 135 14 0 -28 15 33 0.24
135 43 59 -28 51 43 11 57 57.5 56 351 -45 136 5 55 -28 57 58 135 22 7 -28 45 29 136 20 31 -29 2 8 135 7 38 -28 41 21 0.24
135 37 45 -29 17 42 11 58 1.4 55 351 -45 135 59 46 -29 23 59 135 15 47 -29 11 26 136 14 25 -29 28 10 135 1 14 -29 7 17 0.24
135 31 29 -29 43 49 11 58 5.2 55 351 -44 135 53 35 -29 50 7 135 9 25 -29 37 31 136 8 18 -29 54 20 134 54 49 -29 33 21 0.24
135 25 11 -30 10 4 11 58 9.0 55 352 -44 135 47 24 -30 16 24 135 3 3 -30 3 44 136 2 11 -30 20 38 134 48 22 -29 59 33 0.24
135 18 53 -30 36 27 11 58 12.9 54 352 -44 135 41 11 -30 42 50 134 56 38 -30 30 6 135 56 2 -30 47 4 134 41 54 -30 25 53 0.24
135 12 33 -31 2 59 11 58 16.7 54 352 -44 135 34 57 -31 9 24 134 50 12 -30 56 36 135 49 51 -31 13 40 134 35 24 -30 52 22 0.24
135 6 11 -31 29 40 11 58 20.6 53 352 -44 135 28 41 -31 36 7 134 43 44 -31 23 15 135 43 40 -31 40 24 134 28 53 -31 19 0 0.24
134 59 48 -31 56 31 11 58 24.4 53 353 -44 135 22 25 -32 2 59 134 37 15 -31 50 4 135 37 28 -32 7 18 134 22 19 -31 45 47 0.24
134 53 23 -32 23 30 11 58 28.2 52 353 -43 135 16 6 -32 30 1 134 30 44 -32 17 1 135 31 13 -32 34 21 134 15 44 -32 12 44 0.24
134 46 56 -32 50 40 11 58 32.1 52 353 -43 135 9 46 -32 57 13 134 24 10 -32 44 9 135 24 58 -33 1 34 134 9 6 -32 39 50 0.24
134 40 28 -33 18 0 11 58 35.9 52 353 -43 135 3 24 -33 24 34 134 17 35 -33 11 26 135 18 41 -33 28 58 134 2 26 -33 7 6 0.24
134 33 57 -33 45 29 11 58 39.7 51 353 -43 134 57 1 -33 52 7 134 10 58 -33 38 54 135 12 22 -33 56 31 133 55 44 -33 34 32 0.25
134 27 25 -34 13 10 11 58 43.6 51 354 -43 134 50 36 -34 19 49 134 4 18 -34 6 32 135 6 2 -34 24 16 133 49 0 -34 2 8 0.25
134 20 50 -34 41 1 11 58 47.4 50 354 -42 134 44 8 -34 47 43 133 57 36 -34 34 21 134 59 40 -34 52 11 133 42 13 -34 29 55 0.25
134 14 13 -35 9 4 11 58 51.3 50 354 -42 134 37 39 -35 15 48 133 50 51 -35 2 21 134 53 15 -35 20 18 133 35 23 -34 57 54 0.25
134 7 33 -35 37 18 11 58 55.1 49 354 -42 134 31 8 -35 44 5 133 44 4 -35 30 32 134 46 49 -35 48 36 133 28 30 -35 26 4 0.25
134 0 51 -36 5 44 11 58 58.9 49 355 -42 134 24 34 -36 12 34 133 37 14 -35 58 56 134 40 21 -36 17 7 133 21 35 -35 54 26 0.25
133 54 7 -36 34 22 11 59 2.8 48 355 -42 134 17 58 -36 41 15 133 30 21 -36 27 32 134 33 50 -36 45 50 133 14 37 -36 23 0 0.25
133 47 19 -37 3 14 11 59 6.6 48 355 -41 134 11 19 -37 10 9 133 23 25 -36 56 20 134 27 18 -37 14 46 133 7 35 -36 51 46 0.25
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