IOTA/IOTA-ES occultation update for (859) Bouzareah / TYC 6765-00722-1 event on 2012 Aug 26, 08:46 UT Visible from Australia Summary ------- On 2012 Aug 26 UT, the 77 km diameter asteroid (859) Bouzareah will occult a 11.5 mag star in the constellation Libra for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.5 mag to 16.0 mag (the magnitude of the asteroid) for at most 3.8 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 61 * date and approx. time of event: 2012 Aug 26, 08:47 - 2012 Aug 26, 08:51 UT * geocentric midpoint of event [JD]: 2456165.86555417 * magnitude of target star: 11.5 * magnitude drop [mag]: 4.5 * estimated maximum duration [s]: 3.8 * Moon: 70 % sunlit, 36° distance * Sun: 78° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 77 * 1 sigma uncertainty interval [path widths]: +/- 1.00 * 1 sigma uncertainty interval [seconds]: +/- 3.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .029", 98° ) * approx speed of asteroid's shadow [km/s]: 20.2261 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6765-00722-1 by 859 Bouzareah on 2012 Aug 26 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 133 0 0 -29 44 34 8 47 27 78 289 0 -30 5 45 -29 23 23 -30 48 8 -28 41 2 134 0 0 -29 53 41 8 47 32 77 288 -1 -30 14 50 -29 32 32 -30 57 9 -28 50 14 135 0 0 -30 2 20 8 47 37 76 287 -2 -30 23 27 -29 41 13 -31 5 43 -28 58 59 136 0 0 -30 10 31 8 47 42 75 286 -3 -30 31 36 -29 49 25 -31 13 48 -29 7 15 137 0 0 -30 18 13 8 47 47 74 285 -4 -30 39 17 -29 57 10 -31 21 26 -29 15 3 138 0 0 -30 25 28 8 47 51 73 284 -5 -30 46 31 -30 4 26 -31 28 36 -29 22 22 139 0 0 -30 32 15 8 47 56 73 283 -6 -30 53 16 -30 11 14 -31 35 19 -29 29 13 140 0 0 -30 38 34 8 48 1 72 282 -6 -30 59 34 -30 17 35 -31 41 34 -29 35 36 141 0 0 -30 44 25 8 48 5 71 282 -7 -31 5 24 -30 23 27 -31 47 21 -29 41 31 142 0 0 -30 49 49 8 48 10 70 281 -8 -31 10 46 -30 28 52 -31 52 42 -29 46 58 143 0 0 -30 54 45 8 48 14 69 280 -9 -31 15 41 -30 33 49 -31 57 34 -29 51 57 144 0 0 -30 59 13 8 48 19 68 279 -10 -31 20 8 -30 38 18 -32 1 59 -29 56 28 145 0 0 -31 3 14 8 48 23 67 279 -11 -31 24 8 -30 42 19 -32 5 58 -30 0 32 146 0 0 -31 6 47 8 48 28 66 278 -12 -31 27 40 -30 45 53 -32 9 28 -30 4 7 147 0 0 -31 9 52 8 48 32 66 277 -13 -31 30 45 -30 49 0 -32 12 32 -30 7 15 148 0 0 -31 12 30 8 48 36 65 277 -14 -31 33 23 -30 51 38 -32 15 8 -30 9 54 149 0 0 -31 14 41 8 48 41 64 276 -14 -31 35 33 -30 53 50 -32 17 18 -30 12 7 150 0 0 -31 16 25 8 48 45 63 275 -15 -31 37 16 -30 55 33 -32 19 0 -30 13 51 151 0 0 -31 17 41 8 48 49 62 275 -16 -31 38 32 -30 56 50 -32 20 15 -30 15 8 152 0 0 -31 18 29 8 48 54 61 274 -17 -31 39 20 -30 57 38 -32 21 3 -30 15 57 153 0 0 -31 18 51 8 48 58 60 274 -18 -31 39 42 -30 58 0 -32 21 25 -30 16 19 154 0 0 -31 18 45 8 49 2 59 273 -19 -31 39 36 -30 57 54 -32 21 19 -30 16 13 155 0 0 -31 18 12 8 49 6 59 272 -20 -31 39 3 -30 57 21 -32 20 46 -30 15 39 156 0 0 -31 17 11 8 49 10 58 272 -20 -31 38 3 -30 56 20 -32 19 46 -30 14 38 157 0 0 -31 15 43 8 49 14 57 271 -21 -31 36 35 -30 54 52 -32 18 19 -30 13 9 158 0 0 -31 13 48 8 49 18 56 270 -22 -31 34 41 -30 52 57 -32 16 26 -30 11 13 159 0 0 -31 11 26 8 49 22 55 270 -23 -31 32 19 -30 50 34 -32 14 5 -30 8 49 160 0 0 -31 8 37 8 49 26 54 269 -24 -31 29 30 -30 47 44 -32 11 17 -30 5 58 161 0 0 -31 5 20 8 49 30 53 269 -25 -31 26 14 -30 44 26 -32 8 2 -30 2 39 162 0 0 -31 1 36 8 49 34 53 268 -26 -31 22 30 -30 40 41 -32 4 21 -29 58 52 163 0 0 -30 57 24 8 49 38 52 268 -27 -31 18 20 -30 36 29 -32 0 12 -29 54 38 164 0 0 -30 52 45 8 49 41 51 267 -27 -31 13 42 -30 31 49 -31 55 36 -29 49 56 165 0 0 -30 47 39 8 49 45 50 266 -28 -31 8 37 -30 26 41 -31 50 33 -29 44 47 166 0 0 -30 42 5 8 49 49 49 266 -29 -31 3 4 -30 21 7 -31 45 3 -29 39 10 167 0 0 -30 36 4 8 49 52 48 265 -30 -30 57 5 -30 15 4 -31 39 6 -29 33 5 168 0 0 -30 29 36 8 49 56 47 265 -31 -30 50 37 -30 8 34 -31 32 41 -29 26 32 169 0 0 -30 22 40 8 49 59 46 264 -32 -30 43 43 -30 1 37 -31 25 50 -29 19 32 170 0 0 -30 15 16 8 50 3 46 264 -33 -30 36 21 -29 54 12 -31 18 31 -29 12 3 171 0 0 -30 7 25 8 50 6 45 263 -34 -30 28 31 -29 46 19 -31 10 45 -29 4 7 172 0 0 -29 59 6 8 50 10 44 263 -35 -30 20 14 -29 37 58 -31 2 31 -28 55 43 173 0 0 -29 50 20 8 50 13 43 262 -35 -30 11 30 -29 29 10 -30 53 50 -28 46 52 174 0 0 -29 41 6 8 50 17 42 262 -36 -30 2 17 -29 19 54 -30 44 42 -28 37 32 175 0 0 -29 31 24 8 50 20 41 261 -37 -29 52 37 -29 10 10 -30 35 6 -28 27 44 176 0 0 -29 21 14 8 50 23 40 261 -38 -29 42 30 -28 59 59 -30 25 2 -28 17 28 177 0 0 -29 10 36 8 50 26 39 260 -39 -29 31 54 -28 49 19 -30 14 31 -28 6 44 178 0 0 -28 59 31 8 50 29 38 260 -40 -29 20 51 -28 38 11 -30 3 32 -27 55 32 179 0 0 -28 47 58 8 50 32 37 259 -41 -29 9 20 -28 26 36 -29 52 6 -27 43 52 180 0 0 -28 35 57 8 50 36 37 259 -42 -28 57 21 -28 14 32 -29 40 12 -27 31 44 -179 0 0 -28 23 27 8 50 38 36 258 -43 -28 44 55 -28 2 0 -29 27 50 -27 19 7 -178 0 0 -28 10 30 8 50 41 35 258 -44 -28 32 0 -27 49 1 -29 15 0 -27 6 2 -177 0 0 -27 57 5 8 50 44 34 257 -44 -28 18 37 -27 35 33 -29 1 43 -26 52 29 -176 0 0 -27 43 12 8 50 47 33 257 -45 -28 4 47 -27 21 37 -28 47 57 -26 38 28 -175 0 0 -27 28 50 8 50 50 32 256 -46 -27 50 28 -27 7 13 -28 33 44 -26 23 59 -174 0 0 -27 14 1 8 50 52 31 256 -47 -27 35 41 -26 52 21 -28 19 3 -26 9 1 -173 0 0 -26 58 43 8 50 55 30 255 -48 -27 20 27 -26 37 0 -28 3 54 -25 53 35 -172 0 0 -26 42 58 8 50 58 29 255 -49 -27 4 44 -26 21 12 -27 48 17 -25 37 41 -171 0 0 -26 26 44 8 51 0 28 254 -50 -26 48 33 -26 4 55 -27 32 12 -25 21 19 -170 0 0 -26 10 2 8 51 3 27 254 -51 -26 31 54 -25 48 11 -27 15 39 -25 4 28 -169 0 0 -25 52 53 8 51 5 26 253 -52 -26 14 48 -25 30 58 -26 58 39 -24 47 9 -168 0 0 -25 35 15 8 51 7 25 253 -53 -25 57 13 -25 13 17 -26 41 10 -24 29 22 -167 0 0 -25 17 9 8 51 10 24 252 -54 -25 39 11 -24 55 8 -26 23 14 -24 11 7 -166 0 0 -24 58 36 8 51 12 23 252 -55 -25 20 40 -24 36 32 -26 4 50 -23 52 24 -165 0 0 -24 39 34 8 51 14 22 252 -56 -25 1 42 -24 17 27 -25 45 58 -23 33 14 -164 0 0 -24 20 5 8 51 16 21 251 -57 -24 42 16 -23 57 55 -25 26 39 -23 13 35 -163 0 0 -24 0 9 8 51 18 21 251 -58 -24 22 23 -23 37 55 -25 6 52 -22 53 29 -162 0 0 -23 39 45 8 51 20 20 250 -59 -24 2 2 -23 17 28 -24 46 37 -22 32 55 -161 0 0 -23 18 53 8 51 21 19 250 -60 -23 41 13 -22 56 33 -24 25 55 -22 11 53 -160 0 0 -22 57 34 8 51 23 18 250 -61 -23 19 58 -22 35 11 -24 4 47 -21 50 25 -159 0 0 -22 35 48 8 51 25 17 249 -62 -22 58 15 -22 13 22 -23 43 11 -21 28 29 -158 0 0 -22 13 36 8 51 26 16 249 -63 -22 36 6 -21 51 6 -23 21 8 -21 6 7 -157 0 0 -21 50 56 8 51 28 15 248 -64 -22 13 30 -21 28 23 -22 58 38 -20 43 17 -156 0 0 -21 27 50 8 51 29 14 248 -65 -21 50 27 -21 5 14 -22 35 42 -20 20 2 -155 0 0 -21 4 18 8 51 30 13 248 -66 -21 26 58 -20 41 38 -22 12 20 -19 56 20 -154 0 0 -20 40 20 8 51 31 12 247 -67 -21 3 3 -20 17 37 -21 48 31 -19 32 12 -153 0 0 -20 15 56 8 51 32 10 247 -68 -20 38 43 -19 53 10 -21 24 17 -19 7 38 -152 0 0 -19 51 7 8 51 33 9 247 -69 -20 13 57 -19 28 17 -20 59 38 -18 42 39 -151 0 0 -19 25 53 8 51 34 8 246 -70 -19 48 46 -19 3 0 -20 34 33 -18 17 16 -150 0 0 -19 0 14 8 51 35 7 246 -71 -19 23 10 -18 37 18 -20 9 3 -17 51 27 -149 0 0 -18 34 10 8 51 36 6 246 -72 -18 57 9 -18 11 11 -19 43 9 -17 25 14 -148 0 0 -18 7 43 8 51 36 5 245 -73 -18 30 45 -17 44 41 -19 16 51 -16 58 38 -147 0 0 -17 40 52 8 51 37 4 245 -74 -18 3 57 -17 17 47 -18 50 9 -16 31 38 -146 0 0 -17 13 38 8 51 37 3 245 -75 -17 36 46 -16 50 30 -18 23 4 -16 4 15 -145 0 0 -16 46 1 8 51 38 2 244 -76 -17 9 13 -16 22 51 -17 55 37 -15 36 30 -144 0 0 -16 18 3 8 51 38 1 244 -77 -16 41 17 -15 54 49 -17 27 47 -15 8 23 Uncertainty in time = +/- 4 secs Prediction of 2012 Jul 8.0 Data for the target star ------------------------ * name: TYC 6765-00722-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 08 33.6618 DE: -25 02 45.029 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .027, .027 ) * V mag [mag]: 11.5 * B mag [mag]: 12.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (859) Bouzareah approx. diameter [km]: 77 approx. diameter ["]: .029 distance from Earth [AU]: 3.62000 * orbital information: orbit source: Preston date of fit: 2012 Jul 07 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 867 number of rejected observations: 58 time covered by the observations: 1916 Sep 21 - 2012 Jun 26 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.012, 120° remarks: * orbital elements for (859) Bouzareah : Mean anomaly = 198.35121533 deg Arg. of pericenter = 17.82191807 deg Long. of node = 35.84095520 deg Inclination = 13.51004247 deg Eccentricity = 0.10606271 Semimajor axis = 3.22909791 AU Perihelion dist = 2.88661102 AU Mag: H = 9.62, G = 0.15 Epoch of elements : MJD 56165.36500000 TDT (2012 Aug 26.365) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 26 859 Bouzareah 8h 46.4m UT 11.5 15 8 33.662-25 2 45.03TYC 6765-00722-1 12.8 16.0 77 3.8 3.620 1.967 -7.42 120.5314 -25.044 48.84 10.21 8.7733 -0.00542 -0.03299 11.00010 -3.05402 0.00537 -0.00168 2000 197.4399352012 821.00000 17.821918 35.840955 13.5100420.10606271 3.2290979 2.8866110 9.6 5.00.15 RATE 1.6985650 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.029 98 2.00 0.029 0 0-2 1 056116.0020120826_0722-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 08, 00:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org