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Updated: 2021 Jul 15, 17:30 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 2021 Aug 10 UT, the 97 km diameter asteroid (227) Philosophia will occult a 12.3 mag star in the constellation Scorpius for observers along a path across western Tasmania, Victoria, New South Wales and Queensland, passing over Melbourne, Benalla and Mackay.
In the case of an occultation, the combined light of the asteroid and the star will drop by 1.71 mag to 13.73 mag (the magnitude of the asteroid) for at most 17.4 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 7379-00122-1 by 227 Philosophia on 2021 Aug 10
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
144 37 18 -44 53 44 12 24 54.4 65 291 -51 143 57 49 -44 48 6 145 17 3 -44 59 11 143 44 18 -44 46 8 145 30 47 -45 1 1 0.45
144 40 17 -44 32 26 12 25 1.5 65 290 -51 144 1 2 -44 26 50 145 19 48 -44 37 51 143 47 36 -44 24 52 145 33 27 -44 39 40 0.46
144 43 17 -44 11 9 12 25 8.7 65 289 -51 144 4 17 -44 5 34 145 22 34 -44 16 32 143 50 55 -44 3 37 145 36 8 -44 18 21 0.46
144 46 19 -43 49 53 12 25 15.8 65 288 -52 144 7 32 -43 44 20 145 25 22 -43 55 15 143 54 15 -43 42 23 145 38 52 -43 57 3 0.46
144 49 23 -43 28 37 12 25 23.0 65 287 -52 144 10 49 -43 23 6 145 28 12 -43 33 58 143 57 37 -43 21 10 145 41 37 -43 35 45 0.46
144 52 28 -43 7 23 12 25 30.2 65 286 -52 144 14 7 -43 1 53 145 31 4 -43 12 41 144 0 59 -42 59 58 145 44 24 -43 14 28 0.46
144 55 34 -42 46 9 12 25 37.3 65 286 -52 144 17 26 -42 40 41 145 33 57 -42 51 26 144 4 23 -42 38 46 145 47 13 -42 53 13 0.46
144 58 42 -42 24 56 12 25 44.5 65 285 -53 144 20 47 -42 19 30 145 36 53 -42 30 12 144 7 48 -42 17 35 145 50 4 -42 31 57 0.46
145 1 52 -42 3 44 12 25 51.6 65 284 -53 144 24 8 -41 58 19 145 39 50 -42 8 58 144 11 14 -41 56 25 145 52 56 -42 10 43 0.46
145 5 3 -41 42 32 12 25 58.8 65 283 -53 144 27 31 -41 37 9 145 42 48 -41 47 44 144 14 41 -41 35 16 145 55 51 -41 49 29 0.46
145 8 15 -41 21 21 12 26 6.0 65 282 -54 144 30 56 -41 16 0 145 45 49 -41 26 32 144 18 9 -41 14 7 145 58 47 -41 28 16 0.46
145 11 29 -41 0 11 12 26 13.1 65 281 -54 144 34 22 -40 54 51 145 48 51 -41 5 20 144 21 39 -40 52 59 146 1 46 -41 7 3 0.46
145 14 45 -40 39 1 12 26 20.3 65 281 -54 144 37 49 -40 33 43 145 51 55 -40 44 8 144 25 10 -40 31 51 146 4 46 -40 45 51 0.46
145 18 2 -40 17 51 12 26 27.4 65 280 -54 144 41 17 -40 12 34 145 55 1 -40 22 57 144 28 42 -40 10 43 146 7 48 -40 24 39 0.46
145 21 21 -39 56 41 12 26 34.6 65 279 -55 144 44 47 -39 51 27 145 58 9 -40 1 46 144 32 15 -39 49 36 146 10 52 -40 3 28 0.46
145 24 41 -39 35 32 12 26 41.8 65 278 -55 144 48 18 -39 30 19 146 1 19 -39 40 35 144 35 50 -39 28 29 146 13 57 -39 42 17 0.46
145 28 3 -39 14 24 12 26 48.9 65 277 -55 144 51 50 -39 9 12 146 4 30 -39 19 25 144 39 26 -39 7 23 146 17 5 -39 21 6 0.46
145 31 27 -38 53 15 12 26 56.1 65 276 -55 144 55 24 -38 48 5 146 7 43 -38 58 15 144 43 4 -38 46 16 146 20 15 -38 59 55 0.46
145 34 52 -38 32 7 12 27 3.2 65 276 -56 144 59 0 -38 26 58 146 10 58 -38 37 4 144 46 43 -38 25 10 146 23 26 -38 38 44 0.46
145 38 19 -38 10 58 12 27 10.4 65 275 -56 145 2 37 -38 5 51 146 14 15 -38 15 54 144 50 23 -38 4 4 146 26 40 -38 17 34 0.46
145 41 48 -37 49 50 12 27 17.6 65 274 -56 145 6 15 -37 44 45 146 17 34 -37 54 45 144 54 4 -37 42 57 146 29 55 -37 56 24 0.46
145 45 18 -37 28 41 12 27 24.7 65 273 -56 145 9 55 -37 23 38 146 20 55 -37 33 35 144 57 48 -37 21 51 146 33 12 -37 35 13 0.46
145 48 50 -37 7 33 12 27 31.9 65 272 -57 145 13 36 -37 2 31 146 24 17 -37 12 25 145 1 32 -37 0 45 146 36 32 -37 14 2 0.46
145 52 24 -36 46 24 12 27 39.0 65 272 -57 145 17 19 -36 41 24 146 27 42 -36 51 14 145 5 18 -36 39 38 146 39 53 -36 52 52 0.46
145 55 59 -36 25 15 12 27 46.2 65 271 -57 145 21 4 -36 20 16 146 31 8 -36 30 4 145 9 6 -36 18 31 146 43 16 -36 31 41 0.46
145 59 37 -36 4 6 12 27 53.4 65 270 -57 145 24 50 -35 59 9 146 34 36 -36 8 53 145 12 55 -35 57 24 146 46 41 -36 10 30 0.47
146 3 16 -35 42 57 12 28 0.5 65 269 -58 145 28 37 -35 38 1 146 38 7 -35 47 42 145 16 46 -35 36 17 146 50 8 -35 49 18 0.47
146 6 57 -35 21 47 12 28 7.7 65 268 -58 145 32 27 -35 16 53 146 41 39 -35 26 31 145 20 38 -35 15 9 146 53 38 -35 28 6 0.47
146 10 39 -35 0 37 12 28 14.8 65 267 -58 145 36 18 -34 55 44 146 45 13 -35 5 19 145 24 32 -34 54 1 146 57 9 -35 6 54 0.47
146 14 24 -34 39 26 12 28 22.0 64 267 -58 145 40 10 -34 34 35 146 48 49 -34 44 7 145 28 27 -34 32 53 147 0 43 -34 45 41 0.47
146 18 10 -34 18 15 12 28 29.2 64 266 -59 145 44 5 -34 13 26 146 52 28 -34 22 54 145 32 24 -34 11 44 147 4 18 -34 24 28 0.47
146 21 59 -33 57 3 12 28 36.3 64 265 -59 145 48 1 -33 52 15 146 56 8 -34 1 41 145 36 23 -33 50 34 147 7 56 -34 3 14 0.47
146 25 49 -33 35 51 12 28 43.5 64 264 -59 145 51 59 -33 31 5 146 59 51 -33 40 27 145 40 24 -33 29 24 147 11 35 -33 42 0 0.47
146 29 41 -33 14 38 12 28 50.7 64 264 -59 145 55 59 -33 9 53 147 3 35 -33 19 13 145 44 26 -33 8 13 147 15 17 -33 20 45 0.47
146 33 35 -32 53 24 12 28 57.8 64 263 -60 146 0 0 -32 48 41 147 7 22 -32 57 57 145 48 30 -32 47 1 147 19 2 -32 59 29 0.47
146 37 32 -32 32 9 12 29 5.0 64 262 -60 146 4 4 -32 27 28 147 11 11 -32 36 41 145 52 36 -32 25 49 147 22 48 -32 38 12 0.47
146 41 30 -32 10 54 12 29 12.1 64 261 -60 146 8 9 -32 6 14 147 15 2 -32 15 24 145 56 44 -32 4 35 147 26 37 -32 16 55 0.47
146 45 30 -31 49 37 12 29 19.3 64 261 -60 146 12 17 -31 44 59 147 18 55 -31 54 6 146 0 54 -31 43 21 147 30 27 -31 55 36 0.47
146 49 33 -31 28 20 12 29 26.5 63 260 -60 146 16 26 -31 23 43 147 22 51 -31 32 47 146 5 5 -31 22 5 147 34 21 -31 34 17 0.47
146 53 37 -31 7 1 12 29 33.6 63 259 -61 146 20 37 -31 2 26 147 26 49 -31 11 27 146 9 19 -31 0 49 147 38 16 -31 12 56 0.47
146 57 44 -30 45 42 12 29 40.8 63 258 -61 146 24 50 -30 41 8 147 30 49 -30 50 6 146 13 34 -30 39 32 147 42 14 -30 51 34 0.47
147 1 53 -30 24 21 12 29 47.9 63 258 -61 146 29 6 -30 19 49 147 34 51 -30 28 43 146 17 52 -30 18 13 147 46 14 -30 30 11 0.47
147 6 4 -30 2 59 12 29 55.1 63 257 -61 146 33 23 -29 58 28 147 38 56 -30 7 20 146 22 11 -29 56 53 147 50 17 -30 8 47 0.47
147 10 17 -29 41 36 12 30 2.3 63 256 -62 146 37 43 -29 37 7 147 43 3 -29 45 55 146 26 33 -29 35 32 147 54 22 -29 47 22 0.47
147 14 33 -29 20 11 12 30 9.4 62 256 -62 146 42 4 -29 15 44 147 47 13 -29 24 29 146 30 57 -29 14 10 147 58 29 -29 25 55 0.48
147 18 51 -28 58 45 12 30 16.6 62 255 -62 146 46 28 -28 54 19 147 51 25 -29 3 1 146 35 23 -28 52 46 148 2 39 -29 4 27 0.48
147 23 12 -28 37 18 12 30 23.7 62 254 -62 146 50 55 -28 32 53 147 55 40 -28 41 32 146 39 51 -28 31 20 148 6 52 -28 42 57 0.48
147 27 35 -28 15 49 12 30 30.9 62 254 -63 146 55 23 -28 11 26 147 59 57 -28 20 2 146 44 21 -28 9 53 148 11 7 -28 21 26 0.48
147 32 0 -27 54 18 12 30 38.1 62 253 -63 146 59 54 -27 49 57 148 4 17 -27 58 29 146 48 54 -27 48 25 148 15 25 -27 59 54 0.48
147 36 28 -27 32 46 12 30 45.2 62 252 -63 147 4 27 -27 28 26 148 8 39 -27 36 55 146 53 29 -27 26 55 148 19 46 -27 38 19 0.48
147 40 58 -27 11 12 12 30 52.4 61 252 -63 147 9 3 -27 6 54 148 13 4 -27 15 20 146 58 7 -27 5 23 148 24 9 -27 16 43 0.48
147 45 31 -26 49 36 12 30 59.5 61 251 -63 147 13 41 -26 45 20 148 17 32 -26 53 42 147 2 47 -26 43 49 148 28 35 -26 55 5 0.48
147 50 7 -26 27 58 12 31 6.7 61 251 -64 147 18 22 -26 23 44 148 22 3 -26 32 3 147 7 29 -26 22 14 148 33 4 -26 33 25 0.48
147 54 45 -26 6 19 12 31 13.9 61 250 -64 147 23 5 -26 2 6 148 26 36 -26 10 22 147 12 14 -26 0 36 148 37 36 -26 11 43 0.48
147 59 26 -25 44 37 12 31 21.0 61 249 -64 147 27 51 -25 40 26 148 31 12 -25 48 38 147 17 1 -25 38 57 148 42 10 -25 49 59 0.48
148 4 10 -25 22 53 12 31 28.2 60 249 -64 147 32 39 -25 18 44 148 35 51 -25 26 53 147 21 51 -25 17 16 148 46 48 -25 28 13 0.48
148 8 57 -25 1 7 12 31 35.3 60 248 -64 147 37 30 -24 56 59 148 40 33 -25 5 5 147 26 44 -24 55 32 148 51 28 -25 6 25 0.48
148 13 46 -24 39 19 12 31 42.5 60 248 -65 147 42 24 -24 35 13 148 45 18 -24 43 16 147 31 40 -24 33 46 148 56 12 -24 44 35 0.48
148 18 39 -24 17 29 12 31 49.7 60 247 -65 147 47 21 -24 13 24 148 50 7 -24 21 24 147 36 38 -24 11 58 149 0 58 -24 22 42 0.48
148 23 34 -23 55 36 12 31 56.8 59 247 -65 147 52 21 -23 51 33 148 54 58 -23 59 29 147 41 39 -23 50 7 149 5 48 -24 0 47 0.48
148 28 33 -23 33 41 12 32 4.0 59 246 -65 147 57 23 -23 29 40 148 59 52 -23 37 32 147 46 43 -23 28 15 149 10 41 -23 38 49 0.48
148 33 34 -23 11 43 12 32 11.1 59 246 -65 148 2 29 -23 7 44 149 4 50 -23 15 33 147 51 50 -23 6 19 149 15 37 -23 16 49 0.49
148 38 39 -22 49 43 12 32 18.3 59 245 -66 148 7 38 -22 45 45 149 9 51 -22 53 30 147 57 0 -22 44 21 149 20 37 -22 54 46 0.49
148 43 47 -22 27 40 12 32 25.5 58 245 -66 148 12 49 -22 23 44 149 14 55 -22 31 26 148 2 13 -22 22 20 149 25 40 -22 32 41 0.49
148 48 58 -22 5 34 12 32 32.6 58 244 -66 148 18 4 -22 1 40 149 20 3 -22 9 18 148 7 29 -22 0 17 149 30 46 -22 10 33 0.49
148 54 13 -21 43 25 12 32 39.8 58 244 -66 148 23 23 -21 39 33 149 25 14 -21 47 7 148 12 49 -21 38 11 149 35 56 -21 48 22 0.49
148 59 31 -21 21 13 12 32 46.9 58 243 -66 148 28 44 -21 17 23 149 30 29 -21 24 54 148 18 11 -21 16 2 149 41 10 -21 26 8 0.49
149 4 53 -20 58 59 12 32 54.1 57 243 -66 148 34 9 -20 55 10 149 35 47 -21 2 38 148 23 37 -20 53 49 149 46 27 -21 3 50 0.49
149 10 18 -20 36 41 12 33 1.3 57 242 -67 148 39 37 -20 32 54 149 41 9 -20 40 18 148 29 7 -20 31 34 149 51 48 -20 41 30 0.49
149 15 47 -20 14 20 12 33 8.4 57 242 -67 148 45 9 -20 10 35 149 46 35 -20 17 55 148 34 40 -20 9 16 149 57 13 -20 19 7 0.49
149 21 19 -19 51 56 12 33 15.6 57 241 -67 148 50 45 -19 48 13 149 52 5 -19 55 29 148 40 16 -19 46 54 150 2 42 -19 56 40 0.49
149 26 56 -19 29 28 12 33 22.7 56 241 -67 148 56 24 -19 25 47 149 57 38 -19 32 59 148 45 56 -19 24 29 150 8 14 -19 34 9 0.49
149 32 36 -19 6 57 12 33 29.9 56 240 -67 149 2 7 -19 3 18 150 3 16 -19 10 26 148 51 40 -19 2 0 150 13 51 -19 11 36 0.49
149 38 20 -18 44 22 12 33 37.1 56 240 -67 149 7 54 -18 40 45 150 8 57 -18 47 49 148 57 28 -18 39 28 150 19 32 -18 48 58 0.49
149 44 9 -18 21 44 12 33 44.2 55 239 -68 149 13 44 -18 18 8 150 14 43 -18 25 9 149 3 20 -18 16 52 150 25 17 -18 26 17 0.49
149 50 1 -17 59 1 12 33 51.4 55 239 -68 149 19 39 -17 55 28 150 20 33 -18 2 24 149 9 15 -17 54 12 150 31 6 -18 3 32 0.49
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