IOTA/IOTA-ES occultation update for (2241) Alcathous / TYC 1154-01808-1 event on 2012 Nov 05, 13:28 UT Visible from E Russia, W Australia Summary ------- On 2012 Nov 05 UT, the 119 km diameter asteroid (2241) Alcathous will occult a 11.9 mag star in the constellation Pegasus for observers along a path across E Russia, W Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.5 mag to 16.4 mag (the magnitude of the asteroid) for at most 15.3 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 30 * date and approx. time of event: 2012 Nov 05, 13:18 - 2012 Nov 05, 13:41 UT * geocentric midpoint of event [JD]: 2456237.06263333 * magnitude of target star: 11.9 * magnitude drop [mag]: 4.5 * estimated maximum duration [s]: 15.3 * Moon: 64 % sunlit, 132° distance * Sun: 119° distance * rough path description: E Russia, W Australia The occultation path -------------------- * approximate projected width [km]: 136 * 1 sigma uncertainty interval [path widths]: +/- 2.21 * 1 sigma uncertainty interval [seconds]: +/- 20.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .072 +/- .046) * 1 sigma uncertainty ellipse (major, minor, PA): ( .074", .043", 74° ) * approx speed of asteroid's shadow [km/s]: 7.7910 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1154-01808-1 by 2241 Alcathous on 2012 Nov 5 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude -170 49 14 64 15 1 13 18 24 7 280 -37 -165 19 48 63 14 9 -174 55 57 64 58 24 ... .. .. .. .. .. 171 44 7 67 4 8 174 43 2 64 0 43 13 18 42 13 267 -40 177 28 59 63 34 59 172 7 59 64 23 50 -162 54 6 60 6 17 162 2 51 65 45 7 165 37 10 62 53 8 13 19 0 17 259 -43 167 47 15 62 35 25 163 31 58 63 9 34 178 57 21 60 53 58 155 0 37 64 10 12 158 56 23 61 28 16 13 19 19 21 254 -44 160 47 31 61 14 39 157 8 12 61 41 2 169 48 2 60 1 30 149 37 33 62 29 8 153 44 50 59 56 1 13 19 37 24 250 -46 155 23 27 59 45 0 152 8 17 60 6 26 163 11 20 58 47 19 145 21 38 60 46 3 149 34 14 58 20 39 13 19 55 26 246 -47 151 3 42 58 11 25 148 6 20 58 29 23 158 2 22 57 23 50 141 53 35 59 2 52 146 7 41 56 44 13 13 20 13 29 244 -49 147 30 4 56 36 18 144 46 34 56 51 43 153 52 15 55 55 53 139 0 53 57 20 34 143 14 12 55 7 49 13 20 31 31 242 -50 144 30 53 55 0 55 141 58 34 55 14 23 150 24 33 54 25 52 136 35 5 55 39 37 140 46 16 53 32 4 13 20 49 33 240 -51 141 58 15 53 25 58 139 35 9 53 37 52 147 28 49 52 55 4 134 30 14 54 0 15 138 38 29 51 57 17 13 21 7 35 239 -52 139 46 33 51 51 49 137 31 13 52 2 28 144 57 58 51 24 14 132 42 5 52 22 31 136 46 58 50 23 37 13 21 26 36 238 -52 137 51 39 50 18 41 135 42 58 50 28 18 142 46 54 49 53 48 131 7 24 50 46 25 135 8 44 48 51 8 13 21 44 38 238 -53 136 10 32 48 46 39 134 7 34 48 55 25 140 51 54 48 24 0 129 43 49 49 11 55 133 41 33 47 19 52 13 22 2 40 237 -54 134 40 48 47 15 45 132 42 51 47 23 48 139 10 9 46 55 0 128 29 27 47 38 55 132 23 37 45 49 48 13 22 20 41 237 -54 133 20 38 45 46 0 131 27 6 45 53 26 137 39 28 45 26 50 127 22 51 46 7 23 131 13 34 44 20 53 13 22 38 43 237 -55 132 8 36 44 17 21 130 18 59 44 24 15 136 18 8 43 59 34 126 22 52 44 37 12 130 10 15 42 53 5 13 22 56 44 237 -56 131 3 32 42 49 47 129 17 25 42 56 13 135 4 49 42 33 10 125 28 35 43 8 17 129 12 47 41 26 19 13 23 14 45 238 -56 130 4 29 41 23 13 128 21 30 41 29 15 133 58 23 41 7 39 124 39 14 41 40 33 128 20 25 40 0 32 13 23 33 47 238 -57 129 10 42 39 57 38 127 30 31 40 3 19 132 57 57 39 42 57 123 54 11 40 13 56 127 32 31 38 35 42 13 23 51 48 239 -57 128 21 31 38 32 57 126 43 54 38 38 19 132 2 47 38 19 4 123 12 55 38 48 20 126 48 36 37 11 44 13 24 9 49 239 -57 127 36 25 37 9 7 126 1 7 37 14 13 131 12 15 36 55 56 122 35 1 37 23 42 126 8 11 35 48 34 13 24 27 50 240 -58 126 54 57 35 46 5 125 21 46 35 50 56 130 25 51 35 33 32 122 0 7 35 59 57 125 30 57 34 26 10 13 24 45 51 241 -58 126 16 44 34 23 48 124 45 29 34 28 25 129 43 9 34 11 48 121 27 55 34 37 1 124 56 33 33 4 28 13 25 3 52 242 -58 125 41 27 33 2 12 124 11 57 33 6 38 129 3 46 32 50 42 120 58 8 33 14 51 124 24 44 31 43 25 13 25 21 53 243 -58 125 8 49 31 41 14 123 40 57 31 45 30 128 27 23 31 30 12 120 30 33 31 53 23 123 55 16 30 22 58 13 25 39 54 244 -59 124 38 36 30 20 52 123 12 13 30 24 58 127 53 43 30 10 14 120 4 58 30 32 33 123 27 57 29 3 4 13 25 58 55 245 -59 124 10 36 29 1 2 122 45 35 29 5 0 127 22 34 28 50 46 119 41 14 29 12 19 123 2 37 27 43 41 13 26 16 56 247 -59 123 44 38 27 41 43 122 20 52 27 45 32 126 53 42 27 31 45 119 19 11 27 52 36 122 39 6 26 24 44 13 26 34 56 248 -59 123 20 32 26 22 50 121 57 56 26 26 33 126 26 57 26 13 10 118 58 42 26 33 24 122 17 17 25 6 13 13 26 52 57 250 -59 122 58 11 25 4 22 121 36 38 25 7 58 126 2 9 24 54 57 118 39 40 25 14 37 121 57 3 23 48 4 13 27 10 58 252 -59 122 37 28 23 46 15 121 16 53 23 49 46 125 39 11 23 37 5 118 22 0 23 56 15 121 38 18 22 30 14 13 27 28 58 253 -59 122 18 15 22 28 28 120 58 34 22 31 55 125 17 55 22 19 30 118 5 36 22 38 14 121 20 56 21 12 42 13 27 46 59 255 -59 122 0 29 21 10 59 120 41 37 21 14 21 124 58 16 21 2 12 117 50 24 21 20 31 121 4 53 19 55 26 13 28 5 59 257 -59 121 44 3 19 53 44 120 25 56 19 57 2 124 40 7 19 45 7 117 36 20 20 3 5 120 50 5 18 38 22 13 28 23 60 259 -58 121 28 54 18 36 42 120 11 29 18 39 56 124 23 24 18 28 13 117 23 20 18 45 53 120 36 28 17 21 28 13 28 41 60 261 -58 121 14 59 17 19 50 119 58 10 17 23 1 124 8 4 17 11 29 117 11 22 17 28 52 120 24 0 16 4 43 13 28 59 61 263 -58 121 2 13 16 3 6 119 45 59 16 6 15 123 54 2 15 54 51 117 0 23 16 12 1 120 12 37 14 48 4 13 29 17 61 266 -58 120 50 36 14 46 28 119 34 51 14 49 35 123 41 16 14 38 19 116 50 21 14 55 17 120 2 18 13 31 29 13 29 35 61 268 -58 120 40 3 13 29 54 119 24 46 13 32 59 123 29 42 13 21 49 116 41 13 13 38 38 119 53 1 12 14 55 13 29 53 61 270 -57 120 30 34 12 13 21 119 15 40 12 16 25 123 19 19 12 5 19 116 33 0 12 22 1 119 44 43 10 58 21 13 30 12 61 272 -57 120 22 6 10 56 47 119 7 33 10 59 50 123 10 5 10 48 49 116 25 38 11 5 25 119 37 25 9 41 45 13 30 30 61 275 -57 120 14 39 9 40 11 119 0 24 9 43 13 123 1 59 9 32 14 116 19 7 9 48 47 119 31 5 8 25 3 13 30 48 61 277 -56 120 8 12 8 23 30 118 54 11 8 26 32 122 54 59 8 15 34 116 13 27 8 32 4 119 25 42 7 8 15 13 31 6 61 279 -56 120 2 43 7 6 41 118 48 54 7 9 43 122 49 5 6 58 45 116 8 37 7 15 16 119 21 17 5 51 17 13 31 24 61 281 -55 119 58 13 5 49 43 118 44 33 5 52 45 122 44 16 5 41 46 116 4 36 5 58 19 119 17 48 4 34 7 13 31 42 60 284 -55 119 54 42 4 32 33 118 41 8 4 35 36 122 40 33 4 24 34 116 1 25 4 41 11 119 15 17 3 16 43 13 32 0 60 286 -55 119 52 9 3 15 8 118 38 38 3 18 13 122 37 56 3 7 6 115 59 3 3 23 50 119 13 44 1 59 2 13 32 18 60 288 -54 119 50 36 1 57 27 118 37 5 2 0 33 122 36 25 1 49 21 115 57 32 2 6 13 119 13 10 0 41 2 13 32 37 59 290 -54 119 50 4 0 39 26 118 36 30 0 42 34 122 36 1 0 31 15 115 56 52 0 48 18 119 13 36 - 0 37 19 13 32 55 58 292 -53 119 50 32 - 0 38 57 118 36 53 - 0 35 47 122 36 46 - 0 47 13 115 57 4 - 0 29 59 119 15 3 - 1 56 6 13 33 13 58 294 -53 119 52 4 - 1 57 45 118 38 15 - 1 54 32 122 38 42 - 2 6 8 115 58 10 - 1 48 38 119 17 33 - 3 15 20 13 33 31 57 296 -52 119 54 41 - 3 17 1 118 40 40 - 3 13 45 122 41 50 - 3 25 32 116 0 10 - 3 7 45 119 21 9 - 4 35 5 13 33 49 57 297 -51 119 58 25 - 4 36 47 118 44 8 - 4 33 28 122 46 14 - 4 45 27 116 3 7 - 4 27 21 119 25 54 - 5 55 24 13 34 7 56 299 -51 120 3 19 - 5 57 8 118 48 43 - 5 53 45 122 51 57 - 6 5 59 116 7 3 - 5 47 30 119 31 50 - 7 16 20 13 34 25 55 300 -50 120 9 27 - 7 18 7 118 54 27 - 7 14 39 122 59 2 - 7 27 10 116 12 1 - 7 8 15 119 39 1 - 8 37 58 13 34 44 54 302 -50 120 16 52 - 8 39 48 119 1 25 - 8 36 14 123 7 35 - 8 49 3 116 18 4 - 8 29 40 119 47 32 -10 0 21 13 35 2 53 303 -49 120 25 39 -10 2 14 119 9 40 - 9 58 34 123 17 40 -10 11 45 116 25 16 - 9 51 48 119 57 27 -11 23 34 13 35 20 52 305 -48 120 35 53 -11 25 30 119 19 18 -11 21 43 123 29 24 -11 35 18 116 33 41 -11 14 45 120 8 53 -12 47 41 13 35 38 51 306 -47 120 47 41 -12 49 40 119 30 24 -12 45 47 123 42 53 -12 59 48 116 43 23 -12 38 34 120 21 57 -14 12 47 13 35 56 50 307 -47 121 1 9 -14 14 51 119 43 4 -14 10 49 123 58 17 -14 25 20 116 54 29 -14 3 20 120 36 47 -15 38 59 13 36 14 49 308 -46 121 16 25 -15 41 8 119 57 28 -15 36 56 124 15 46 -15 52 1 117 7 6 -15 29 9 120 53 32 -17 6 22 13 36 32 48 309 -45 121 33 41 -17 8 36 120 13 43 -17 4 14 124 35 30 -17 19 56 117 21 20 -16 56 7 121 12 23 -18 35 4 13 36 51 47 310 -44 121 53 7 -18 37 24 120 32 1 -18 32 50 124 57 45 -18 49 15 117 37 22 -18 24 20 121 33 34 -20 5 11 13 37 9 45 310 -44 122 14 57 -20 7 39 120 52 34 -20 2 51 125 22 46 -20 20 5 117 55 21 -19 53 56 121 57 21 -21 36 55 13 37 27 44 311 -43 122 39 28 -21 39 30 121 15 38 -21 34 27 125 50 54 -21 52 35 118 15 32 -21 25 2 122 24 1 -23 10 23 13 37 45 43 312 -42 123 6 59 -23 13 7 121 41 30 -23 7 47 126 22 33 -23 26 58 118 38 8 -22 57 49 122 53 59 -24 45 48 13 38 3 41 312 -41 123 37 54 -24 48 42 122 10 32 -24 43 2 126 58 13 -25 3 26 119 3 28 -24 32 26 123 27 42 -26 23 23 13 38 21 40 313 -40 124 12 43 -26 26 29 122 43 12 -26 20 26 127 38 30 -26 42 14 119 31 53 -26 9 7 124 5 45 -28 3 24 13 38 39 38 313 -39 124 52 2 -28 6 45 123 20 1 -28 0 14 128 24 12 -28 23 41 120 3 52 -27 48 5 124 48 52 -29 46 11 13 38 57 36 313 -38 125 36 38 -29 49 48 124 1 43 -29 42 45 129 16 19 -30 8 9 120 39 57 -29 29 37 125 37 59 -31 32 5 13 39 16 35 313 -37 126 27 30 -31 36 2 124 49 10 -31 28 21 130 16 8 -31 56 6 121 20 51 -31 14 3 126 34 20 -33 21 36 13 39 34 33 313 -36 127 25 57 -33 25 56 125 43 31 -33 17 30 131 25 29 -33 48 7 122 7 28 -33 1 48 127 39 34 -35 15 20 13 39 52 31 313 -34 128 33 45 -35 20 9 126 46 20 -35 10 46 132 46 49 -35 44 59 123 0 59 -34 53 21 128 55 58 -37 14 2 13 40 10 29 313 -33 129 53 22 -37 19 29 127 59 44 -37 8 53 134 23 48 -37 47 45 124 2 59 -36 49 21 130 26 53 -39 18 48 13 40 28 26 312 -32 131 28 27 -39 25 4 129 26 47 -39 12 54 136 22 6 -39 57 59 125 15 42 -38 50 38 132 17 23 -41 31 7 13 40 46 24 311 -30 133 24 36 -41 38 31 131 12 6 -41 24 12 138 51 24 -42 18 9 126 42 20 -40 58 17 134 35 54 -43 53 20 13 41 4 21 310 -29 135 51 22 -44 2 24 133 23 12 -43 44 55 142 10 36 -44 52 43 128 27 46 -43 13 56 137 38 9 -46 29 28 13 41 23 17 308 -27 139 7 9 -46 41 18 136 13 41 -46 18 39 147 7 55 -47 52 18 130 40 2 -45 39 57 142 0 6 -49 27 57 13 41 41 13 305 -24 143 57 20 -49 45 34 140 12 53 -49 12 28 159 28 55 -52 26 56 133 33 52 -48 20 25 150 0 12 -53 18 34 13 41 59 7 298 -21 154 22 13 -54 5 22 146 54 54 -52 47 12 ... .. .. .. .. .. 137 41 53 -51 23 30 Uncertainty in time = +/- 34 secs Prediction of 2012 Sep 27.0 Data for the target star ------------------------ * name: TYC 1154-01808-1 * constellation : Pegasus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 22 31 32.7455 DE: +10 37 10.292 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .050, .026 ) * V mag [mag]: 11.9 * B mag [mag]: 13.1 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2241) Alcathous approx. diameter [km]: 119 approx. diameter ["]: .033 distance from Earth [AU]: 4.95100 * orbital information: orbit source: Preston date of fit: 2012 Sep 26 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 691 number of rejected observations: 17 time covered by the observations: 1950 Jun 19 - 2012 Sep 18 1 sigma uncertainty ellipse (major, minor, PA): 0.056, 0.035, 62° remarks: * orbital elements for (2241) Alcathous : Mean anomaly = 150.71098447 deg Arg. of pericenter = 291.13373059 deg Long. of node = 267.99831777 deg Inclination = 16.61287965 deg Eccentricity = 0.06533397 Semimajor axis = 5.19530638 AU Perihelion dist = 4.85587638 AU Mag: H = 8.63, G = 0.15 Epoch of elements : MJD 56236.56100000 TDT (2012 Nov 05.561) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 5 2241 Alcathous 13h 30.2m UT 11.9 22 31 32.746 10 37 10.29TYC 1154-01808-1 13.1 16.4 119 15.3 4.951 0.031 -7.79 90.1560 10.622 -26.64 -15.90 13.5032 0.48235 0.02717 0.25059 -4.39034 0.00521 0.00113 2000 150.16490320121030.00000291.133731267.998318 16.6128800.06533397 5.1953064 4.8558764 8.6 5.00.15 RATE 0.8323140 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.074 0.043 74 3.21 0.073 0 0-5 2 056197.0020121105_1808-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Sep 26, 23:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org