IOTA/IOTA-ES occultation update for (87) Sylvia / TYC 1868-01952-1 event on 2012 Nov 24, 05:49 UT Visible from S Canada Summary ------- On 2012 Nov 24 UT, the 263 km diameter asteroid (87) Sylvia will occult a 11.3 mag star in the constellation Gemini for observers along a path across S Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 12.4 mag (the magnitude of the asteroid) for at most 21.9 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: 99 * date and approx. time of event: 2012 Nov 24, 05:42 - 2012 Nov 24, 05:57 UT * geocentric midpoint of event [JD]: 2456255.74280833 * magnitude of target star: 11.3 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 21.9 * Moon: 84 % sunlit, 76° distance * Sun: 151° distance * rough path description: S Canada The occultation path -------------------- * approximate projected width [km]: 282 * 1 sigma uncertainty interval [path widths]: +/- 0.18 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .024) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .024", 88° ) * approx speed of asteroid's shadow [km/s]: 11.9815 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1868-01952-1 by 87 Sylvia on 2012 Nov 24 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 -170 0 0 34 30 53 5 57 53 1 58 -22 36 0 47 .. .. .. 36 33 26 .. .. .. -169 0 0 35 1 35 5 57 53 2 59 -23 36 31 17 33 32 53 37 3 51 33 1 11 -168 0 0 35 31 50 5 57 53 3 60 -23 37 1 19 34 3 21 37 33 48 33 31 43 -167 0 0 36 1 38 5 57 52 4 60 -24 37 30 54 34 33 22 38 3 18 34 1 48 -166 0 0 36 30 58 5 57 52 4 61 -25 38 0 1 35 2 55 38 32 20 34 31 27 -165 0 0 36 59 51 5 57 51 5 61 -26 38 28 40 35 32 1 39 0 54 35 0 37 -164 0 0 37 28 15 5 57 50 6 62 -27 38 56 50 36 0 39 39 28 59 35 29 21 -163 0 0 37 56 12 5 57 49 7 63 -28 39 24 32 36 28 50 39 56 36 35 57 36 -162 0 0 38 23 39 5 57 48 8 63 -29 39 51 45 36 56 32 40 23 43 36 25 23 -161 0 0 38 50 39 5 57 46 9 64 -29 40 18 29 37 23 45 40 50 22 36 52 41 -160 0 0 39 17 9 5 57 45 10 64 -30 40 44 44 37 50 30 41 16 32 37 19 32 -159 0 0 39 43 10 5 57 43 11 65 -31 41 10 30 38 16 46 41 42 12 37 45 53 -158 0 0 40 8 42 5 57 41 12 66 -32 41 35 47 38 42 34 42 7 23 38 11 46 -157 0 0 40 33 46 5 57 40 13 66 -32 42 0 35 39 7 52 42 32 5 38 37 10 -156 0 0 40 58 20 5 57 38 13 67 -33 42 24 54 39 32 42 42 56 18 39 2 5 -155 0 0 41 22 25 5 57 36 14 68 -34 42 48 43 39 57 3 43 20 1 39 26 31 -154 0 0 41 46 1 5 57 34 15 68 -35 43 12 3 40 20 54 43 43 16 39 50 28 -153 0 0 42 9 9 5 57 31 16 69 -35 43 34 54 40 44 17 44 6 1 40 13 56 -152 0 0 42 31 47 5 57 29 17 70 -36 43 57 17 41 7 11 44 28 18 40 36 55 -151 0 0 42 53 56 5 57 27 18 70 -37 44 19 10 41 29 36 44 50 5 40 59 26 -150 0 0 43 15 37 5 57 24 18 71 -37 44 40 35 41 51 32 45 11 24 41 21 28 -149 0 0 43 36 49 5 57 21 19 72 -38 45 1 31 42 13 0 45 32 14 41 43 1 -148 0 0 43 57 33 5 57 19 20 73 -39 45 21 59 42 33 59 45 52 36 42 4 5 -147 0 0 44 17 48 5 57 16 21 73 -39 45 41 58 42 54 29 46 12 30 42 24 41 -146 0 0 44 37 35 5 57 13 21 74 -40 46 1 29 43 14 32 46 31 55 42 44 49 -145 0 0 44 56 54 5 57 10 22 75 -41 46 20 33 43 34 6 46 50 53 43 4 29 -144 0 0 45 15 45 5 57 7 23 76 -41 46 39 8 43 53 12 47 9 23 43 23 41 -143 0 0 45 34 9 5 57 4 24 76 -42 46 57 16 44 11 51 47 27 25 43 42 24 -142 0 0 45 52 5 5 57 1 24 77 -43 47 14 57 44 30 2 47 45 0 44 0 40 -141 0 0 46 9 34 5 56 58 25 78 -43 47 32 11 44 47 45 48 2 8 44 18 29 -140 0 0 46 26 35 5 56 55 26 79 -44 47 48 58 45 5 1 48 18 49 44 35 50 -139 0 0 46 43 10 5 56 52 27 79 -44 48 5 18 45 21 50 48 35 4 44 52 44 -138 0 0 46 59 18 5 56 48 27 80 -45 48 21 11 45 38 13 48 50 52 45 9 12 -137 0 0 47 15 0 5 56 45 28 81 -45 48 36 39 45 54 8 49 6 14 45 25 12 -136 0 0 47 30 15 5 56 42 29 82 -46 48 51 40 46 9 37 49 21 11 45 40 46 -135 0 0 47 45 5 5 56 38 29 83 -46 49 6 15 46 24 40 49 35 41 45 55 54 -134 0 0 47 59 28 5 56 35 30 83 -47 49 20 26 46 39 17 49 49 46 46 10 36 -133 0 0 48 13 26 5 56 31 31 84 -47 49 34 10 46 53 28 50 3 26 46 24 51 -132 0 0 48 26 59 5 56 28 32 85 -48 49 47 30 47 7 14 50 16 41 46 38 41 -131 0 0 48 40 7 5 56 24 32 86 -48 50 0 25 47 20 34 50 29 31 46 52 6 -130 0 0 48 52 50 5 56 20 33 87 -49 50 12 55 47 33 29 50 41 57 47 5 5 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31 31 50 59 6 53 59 15 50 31 55 -100 0 0 52 16 35 5 54 15 50 116 -58 53 33 6 51 0 43 54 0 49 50 33 33 - 99 0 0 52 17 51 5 54 10 51 117 -58 53 34 20 51 2 0 54 2 2 50 34 51 - 98 0 0 52 18 46 5 54 5 52 118 -58 53 35 14 51 2 56 54 2 56 50 35 47 - 97 0 0 52 19 20 5 54 1 52 119 -58 53 35 48 51 3 31 54 3 30 50 36 22 - 96 0 0 52 19 34 5 53 56 53 120 -58 53 36 2 51 3 45 54 3 44 50 36 36 - 95 0 0 52 19 28 5 53 51 53 122 -58 53 35 56 51 3 39 54 3 38 50 36 30 - 94 0 0 52 19 1 5 53 46 54 123 -58 53 35 30 51 3 11 54 3 12 50 36 2 - 93 0 0 52 18 14 5 53 42 54 124 -58 53 34 44 51 2 23 54 2 27 50 35 13 - 92 0 0 52 17 7 5 53 37 55 125 -58 53 33 38 51 1 14 54 1 21 50 34 4 - 91 0 0 52 15 39 5 53 32 55 126 -58 53 32 12 50 59 44 53 59 56 50 32 33 - 90 0 0 52 13 50 5 53 27 56 128 -58 53 30 26 50 57 53 53 58 10 50 30 42 - 89 0 0 52 11 41 5 53 22 56 129 -58 53 28 19 50 55 41 53 56 5 50 28 29 - 88 0 0 52 9 11 5 53 17 57 130 -58 53 25 53 50 53 9 53 53 39 50 25 55 - 87 0 0 52 6 21 5 53 12 57 132 -58 53 23 6 50 50 15 53 50 54 50 23 1 - 86 0 0 52 3 10 5 53 7 58 133 -58 53 19 59 50 47 1 53 47 48 50 19 45 - 85 0 0 51 59 39 5 53 2 58 134 -58 53 16 32 50 43 25 53 44 23 50 16 8 - 84 0 0 51 55 47 5 52 56 58 136 -58 53 12 44 50 39 29 53 40 37 50 12 9 - 83 0 0 51 51 33 5 52 51 59 137 -58 53 8 36 50 35 11 53 36 30 50 7 50 - 82 0 0 51 46 59 5 52 46 59 139 -58 53 4 7 50 30 31 53 32 4 50 3 9 - 81 0 0 51 42 4 5 52 41 60 140 -58 52 59 18 50 25 31 53 27 16 49 58 6 - 80 0 0 51 36 48 5 52 35 60 142 -58 52 54 8 50 20 9 53 22 9 49 52 42 - 79 0 0 51 31 11 5 52 30 61 143 -58 52 48 37 50 14 25 53 16 40 49 46 56 - 78 0 0 51 25 13 5 52 25 61 145 -57 52 42 45 50 8 20 53 10 51 49 40 49 - 77 0 0 51 18 53 5 52 19 62 146 -57 52 36 33 50 1 53 53 4 41 49 34 20 - 76 0 0 51 12 11 5 52 14 62 148 -57 52 29 59 49 55 4 52 58 10 49 27 28 - 75 0 0 51 5 8 5 52 8 62 150 -57 52 23 3 49 47 54 52 51 17 49 20 15 - 74 0 0 50 57 43 5 52 3 63 151 -57 52 15 47 49 40 21 52 44 4 49 12 39 - 73 0 0 50 49 57 5 51 57 63 153 -57 52 8 9 49 32 26 52 36 29 49 4 41 - 72 0 0 50 41 48 5 51 51 64 155 -56 52 0 9 49 24 9 52 28 32 48 56 21 - 71 0 0 50 33 17 5 51 46 64 157 -56 51 51 47 49 15 29 52 20 14 48 47 38 - 70 0 0 50 24 24 5 51 40 64 158 -56 51 43 3 49 6 26 52 11 34 48 38 32 - 69 0 0 50 15 8 5 51 34 65 160 -56 51 33 58 48 57 1 52 2 32 48 29 3 - 68 0 0 50 5 30 5 51 28 65 162 -55 51 24 30 48 47 13 51 53 7 48 19 12 - 67 0 0 49 55 29 5 51 22 65 164 -55 51 14 39 48 37 2 51 43 20 48 8 57 - 66 0 0 49 45 5 5 51 17 66 166 -55 51 4 26 48 26 27 51 33 11 47 58 19 - 65 0 0 49 34 18 5 51 11 66 168 -54 50 53 50 48 15 29 51 22 39 47 47 17 - 64 0 0 49 23 7 5 51 5 66 170 -54 50 42 51 48 4 8 51 11 45 47 35 52 - 63 0 0 49 11 34 5 50 58 67 172 -54 50 31 29 47 52 23 51 0 27 47 24 3 - 62 0 0 48 59 36 5 50 52 67 175 -53 50 19 43 47 40 14 50 48 46 47 11 50 - 61 0 0 48 47 15 5 50 46 67 177 -53 50 7 34 47 27 41 50 36 41 46 59 13 - 60 0 0 48 34 30 5 50 40 67 179 -53 49 55 2 47 14 44 50 24 13 46 46 11 - 59 0 0 48 21 21 5 50 34 68 181 -52 49 42 5 47 1 22 50 11 21 46 32 45 - 58 0 0 48 7 47 5 50 27 68 184 -52 49 28 44 46 47 36 49 58 5 46 18 55 - 57 0 0 47 53 49 5 50 21 68 186 -51 49 15 0 46 33 26 49 44 25 46 4 40 - 56 0 0 47 39 26 5 50 14 68 189 -51 49 0 50 46 18 50 49 30 21 45 50 0 - 55 0 0 47 24 39 5 50 8 68 191 -51 48 46 16 46 3 49 49 15 52 45 34 54 - 54 0 0 47 9 26 5 50 1 68 194 -50 48 31 17 45 48 24 49 0 58 45 19 24 - 53 0 0 46 53 49 5 49 55 68 196 -50 48 15 53 45 32 32 48 45 39 45 3 28 - 52 0 0 46 37 46 5 49 48 69 199 -49 48 0 4 45 16 16 48 29 55 44 47 6 - 51 0 0 46 21 17 5 49 41 69 201 -49 47 43 50 44 59 33 48 13 46 44 30 19 - 50 0 0 46 4 23 5 49 34 69 204 -48 47 27 10 44 42 25 47 57 11 44 13 6 - 49 0 0 45 47 3 5 49 28 69 206 -48 47 10 4 44 24 51 47 40 11 43 55 27 - 48 0 0 45 29 17 5 49 21 69 209 -47 46 52 33 44 6 51 47 22 45 43 37 22 - 47 0 0 45 11 5 5 49 14 68 212 -47 46 34 35 43 48 25 47 4 53 43 18 51 - 46 0 0 44 52 26 5 49 7 68 214 -46 46 16 12 43 29 32 46 46 35 42 59 53 - 45 0 0 44 33 21 5 49 0 68 217 -46 45 57 22 43 10 13 46 27 50 42 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11 - 30 0 0 38 53 41 5 47 8 63 251 -36 40 21 17 37 27 5 40 53 5 36 56 7 - 29 0 0 38 27 29 5 47 1 62 253 -35 39 55 18 37 0 40 40 27 10 36 29 38 - 28 0 0 38 0 50 5 46 53 61 255 -34 39 28 52 36 33 49 40 0 49 36 2 43 - 27 0 0 37 33 46 5 46 45 61 256 -33 39 2 0 36 6 32 39 34 2 35 35 22 - 26 0 0 37 6 16 5 46 37 60 258 -33 38 34 42 35 38 50 39 6 48 35 7 35 - 25 0 0 36 38 20 5 46 30 60 260 -32 38 6 58 35 10 43 38 39 8 34 39 24 - 24 0 0 36 9 59 5 46 22 59 261 -31 37 38 48 34 42 11 38 11 3 34 10 48 - 23 0 0 35 41 13 5 46 14 58 263 -30 37 10 14 34 13 14 37 42 33 33 41 47 - 22 0 0 35 12 3 5 46 6 57 264 -29 36 41 14 33 43 53 37 13 37 33 12 23 - 21 0 0 34 42 28 5 45 58 57 266 -29 36 11 50 33 14 9 36 44 16 32 42 35 - 20 0 0 34 12 30 5 45 51 56 267 -28 35 42 1 32 44 1 36 14 32 32 12 24 - 19 0 0 33 42 8 5 45 43 55 268 -27 35 11 49 32 13 30 35 44 23 31 41 50 - 18 0 0 33 11 24 5 45 35 54 270 -26 34 41 14 31 42 37 35 13 51 31 10 53 - 17 0 0 32 40 17 5 45 27 54 271 -25 34 10 15 31 11 22 34 42 56 30 39 35 - 16 0 0 32 8 48 5 45 19 53 272 -24 33 38 55 30 39 45 34 11 38 30 7 56 - 15 0 0 31 36 59 5 45 12 52 273 -23 33 7 13 30 7 49 33 39 59 29 35 57 - 14 0 0 31 4 49 5 45 4 51 274 -22 32 35 9 29 35 31 33 7 58 29 3 37 - 13 0 0 30 32 18 5 44 56 50 275 -21 32 2 46 29 2 55 32 35 36 28 30 59 - 12 0 0 29 59 29 5 44 49 49 276 -21 31 30 2 28 30 0 32 2 55 27 58 2 - 11 0 0 29 26 21 5 44 41 48 277 -20 30 56 59 27 56 47 31 29 54 27 24 47 - 10 0 0 28 52 55 5 44 34 47 278 -19 30 23 38 27 23 16 30 56 35 26 51 14 - 9 0 0 28 19 12 5 44 26 47 279 -18 29 49 59 26 49 29 30 22 57 26 17 26 - 8 0 0 27 45 13 5 44 19 46 280 -17 29 16 4 26 15 27 29 49 3 25 43 22 - 7 0 0 27 10 59 5 44 12 45 281 -16 28 41 52 25 41 9 29 14 53 25 9 4 - 6 0 0 26 36 30 5 44 4 44 282 -15 28 7 26 25 6 38 28 40 27 24 34 32 - 5 0 0 26 1 47 5 43 57 43 283 -14 27 32 45 24 31 54 28 5 47 23 59 47 - 4 0 0 25 26 52 5 43 50 42 283 -13 26 57 51 23 56 57 27 30 53 23 24 50 - 3 0 0 24 51 45 5 43 43 41 284 -12 26 22 44 23 21 50 26 55 46 22 49 42 - 2 0 0 24 16 27 5 43 36 40 285 -11 25 47 26 22 46 32 26 20 28 22 14 24 - 1 0 0 23 40 59 5 43 30 39 285 -10 25 11 57 22 11 5 25 44 59 21 38 58 0 0 0 23 5 23 5 43 23 38 286 -9 24 36 20 21 35 30 25 9 21 21 3 23 1 0 0 22 29 39 5 43 17 37 287 -8 24 0 33 20 59 47 24 33 34 20 27 41 2 0 0 21 53 48 5 43 10 36 287 -7 23 24 40 20 23 59 23 57 39 19 51 54 3 0 0 21 17 51 5 43 4 35 288 -5 22 48 40 19 48 6 23 21 38 19 16 1 4 0 0 20 41 50 5 42 58 34 288 -4 22 12 35 19 12 8 22 45 32 18 40 5 5 0 0 20 5 46 5 42 52 33 289 -3 21 36 26 18 36 8 22 9 22 18 4 6 6 0 0 19 29 39 5 42 46 31 289 -2 21 0 14 18 0 6 21 33 8 17 28 6 7 0 0 18 53 31 5 42 41 30 290 -1 20 24 1 17 24 3 20 56 52 16 52 5 8 0 0 18 17 23 5 42 35 29 290 0 19 47 47 16 48 1 20 20 36 16 16 5 Uncertainty in time = +/- 5 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: TYC 1868-01952-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 05 40.8189 DE: +26 04 52.575 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .030, .023 ) * V mag [mag]: 11.3 * B mag [mag]: 12.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (87) Sylvia approx. diameter [km]: 263 approx. diameter ["]: .137 distance from Earth [AU]: 2.65600 * orbital information: orbit source: Preston date of fit: 2012 Nov 16 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 2219 number of rejected observations: 104 time covered by the observations: 1909 Apr 21 - 2012 Nov 08 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.008, 80° remarks: * orbital elements for (87) Sylvia : Mean anomaly = 95.34476826 deg Arg. of pericenter = 265.34582551 deg Long. of node = 73.14322518 deg Inclination = 10.88653244 deg Eccentricity = 0.08769238 Semimajor axis = 3.49580754 AU Perihelion dist = 3.18925185 AU Mag: H = 6.70, G = 0.15 Epoch of elements : MJD 56255.24200000 TDT (2012 Nov 24.242) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 24 87 Sylvia 5h 49.6m UT 11.3 6 5 40.819 26 4 52.58TYC 1868-01952-1 12.0 12.4 263 21.9 2.656 -1.587 6.67 -59.5865 26.080 89.28 -20.63 5.8274 0.10547 0.34462 -6.45580 2.01406 -0.00291 -0.00022 2000 94.55430820121119.00000265.345826 73.143225 10.8865320.08769238 3.4958075 3.1892519 6.9 5.00.15 RATE 1.5079360 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.032 0.024 88 1.18 0.025 2 7 706 18 1356 0-1-5 056247.0020121124_1952-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Nov 16, 08:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org