IOTA/IOTA-ES occultation update for (132) Aethra / TYC 6850-02001-1 event on 2008 May 07, 15:13 UT Visible from Indonesia, SE China Summary ------- On 2008 May 07 UT, the 43 km diameter asteroid (132) Aethra will occult a 11.5 mag star in the constellation Sagittarius for observers along a path across Indonesia, SE China. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.8 mag to 13.1 mag (the magnitude of the asteroid) for at most 4.3 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: 65 * date and approx. time of event: 2008 May 07, 15:04 - 2008 May 07, 15:23 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 1.8 * estimated maximum duration [s]: 4.3 * Moon: 7 % sunlit, 166° distance * Sun: 136° distance * rough path description: Indonesia, SE China The occultation path -------------------- * approximate projected width [km]: 43 * 1 sigma uncertainty interval [path widths]: +/- 0.93 * 1 sigma uncertainty interval [seconds]: +/- 2.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .024", 69° ) * approx speed of asteroid's shadow [km/s]: 10.0197 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6850-02001-1 by 132 Aethra on 2008 May 7 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 ' " Longitude Longitude Longitude Longitude 105 23 24 33 0 0 15 23 44 1 123 -36 105 48 44 104 57 54 106 35 21 104 9 58 107 9 59 32 0 0 15 23 43 3 124 -37 107 34 19 106 45 30 108 19 10 105 59 31 108 51 15 31 0 0 15 23 42 4 125 -39 109 14 43 108 27 39 109 58 1 107 43 23 110 27 51 30 0 0 15 23 40 6 126 -40 110 50 33 110 5 2 111 32 28 109 22 16 112 0 19 29 0 0 15 23 38 8 126 -41 112 22 20 111 38 11 113 3 0 110 56 45 113 29 3 28 0 0 15 23 35 9 127 -43 113 50 28 113 7 33 114 30 1 112 27 18 114 54 28 27 0 0 15 23 32 11 128 -44 115 15 19 114 33 32 115 53 53 113 54 21 116 16 52 26 0 0 15 23 28 13 128 -46 116 37 13 115 56 26 117 14 52 115 18 13 117 36 32 25 0 0 15 23 24 14 129 -47 117 56 26 117 16 34 118 33 16 116 39 14 118 53 43 24 0 0 15 23 20 16 129 -48 119 13 12 118 34 10 119 49 17 117 57 38 120 8 38 23 0 0 15 23 15 17 130 -49 120 27 45 119 49 28 121 3 8 119 13 39 121 21 29 22 0 0 15 23 10 19 130 -50 121 40 14 121 2 40 122 15 0 120 27 31 122 32 25 21 0 0 15 23 5 20 131 -52 122 50 52 122 13 55 123 25 3 121 39 23 123 41 37 20 0 0 15 22 59 22 131 -53 123 59 46 123 23 25 124 33 25 122 49 26 124 49 12 19 0 0 15 22 53 23 131 -54 125 7 5 124 31 16 125 40 14 123 57 49 125 55 18 18 0 0 15 22 46 25 132 -55 126 12 56 125 37 37 126 45 39 125 4 38 127 0 2 17 0 0 15 22 40 26 132 -56 127 17 27 126 42 36 127 49 45 126 10 3 128 3 31 16 0 0 15 22 33 27 132 -57 128 20 43 127 46 17 128 52 38 127 14 8 129 5 50 15 0 0 15 22 25 29 132 -58 129 22 51 128 48 48 129 54 24 128 17 2 130 7 5 14 0 0 15 22 18 30 133 -59 130 23 55 129 50 14 130 55 9 129 18 48 131 7 21 13 0 0 15 22 10 31 133 -60 131 24 1 130 50 40 131 54 57 130 19 32 132 6 42 12 0 0 15 22 2 33 133 -61 132 23 14 131 50 10 132 53 53 131 19 20 133 5 13 11 0 0 15 21 54 34 133 -62 133 21 36 132 48 49 133 52 1 132 18 15 134 2 58 10 0 0 15 21 45 36 133 -62 134 19 14 133 46 42 134 49 25 133 16 22 135 0 1 9 0 0 15 21 36 37 133 -63 135 16 10 134 43 51 135 46 8 134 13 44 135 56 25 8 0 0 15 21 27 38 133 -64 136 12 28 135 40 22 136 42 15 135 10 27 136 52 14 7 0 0 15 21 18 40 133 -65 137 8 11 136 36 16 137 37 48 136 6 32 137 47 31 6 0 0 15 21 8 41 133 -65 138 3 23 137 31 38 138 32 51 137 2 3 138 42 19 5 0 0 15 20 58 42 133 -66 138 58 7 138 26 31 139 27 27 137 57 4 139 36 41 4 0 0 15 20 48 43 133 -66 139 52 25 139 20 57 140 21 39 138 51 38 140 30 41 3 0 0 15 20 38 45 133 -67 140 46 21 140 14 59 141 15 29 139 45 47 141 24 20 2 0 0 15 20 28 46 133 -67 141 39 57 141 8 41 142 9 0 140 39 34 142 17 41 1 0 0 15 20 17 47 133 -68 142 33 17 142 2 5 143 2 16 141 33 3 143 10 48 0 0 0 15 20 6 49 133 -68 143 26 22 142 55 14 143 55 17 142 26 15 144 3 42 - 1 0 0 15 19 55 50 133 -68 144 19 15 143 48 10 144 48 8 143 19 13 Latitude Latitude Latitude Latitude 145 0 0 - 2 4 3 15 19 44 51 132 -68 - 1 46 22 - 2 21 45 - 1 13 30 - 2 54 42 146 0 0 - 3 12 29 15 19 31 53 132 -69 - 2 54 46 - 3 30 13 - 2 21 50 - 4 3 14 147 0 0 - 4 21 2 15 19 17 54 132 -68 - 4 3 17 - 4 38 47 - 3 30 19 - 5 11 51 148 0 0 - 5 29 37 15 19 4 56 131 -68 - 5 11 51 - 5 47 24 - 4 38 51 - 6 20 30 149 0 0 - 6 38 11 15 18 50 57 131 -68 - 6 20 25 - 6 55 59 - 5 47 23 - 7 29 7 150 0 0 - 7 46 40 15 18 36 59 130 -68 - 7 28 53 - 8 4 28 - 6 55 50 - 8 37 37 151 0 0 - 8 55 0 15 18 22 60 130 -68 - 8 37 12 - 9 12 48 - 8 4 9 - 9 45 57 152 0 0 -10 3 5 15 18 8 61 129 -67 - 9 45 18 -10 20 53 - 9 12 16 -10 54 2 153 0 0 -11 10 54 15 17 53 63 128 -67 -10 53 8 -11 28 41 -10 20 6 -12 1 49 154 0 0 -12 18 22 15 17 39 64 127 -66 -12 0 36 -12 36 8 -11 27 36 -13 9 14 155 0 0 -13 25 24 15 17 24 66 126 -65 -13 7 40 -13 43 9 -12 34 43 -14 16 13 156 0 0 -14 31 59 15 17 10 67 125 -65 -14 14 16 -14 49 42 -13 41 22 -15 22 43 157 0 0 -15 38 1 15 16 55 68 124 -64 -15 20 20 -15 55 43 -14 47 30 -16 28 40 158 0 0 -16 43 28 15 16 40 70 123 -63 -16 25 50 -17 1 7 -15 53 3 -17 34 0 159 0 0 -17 48 17 15 16 26 71 121 -62 -17 30 41 -18 5 54 -16 57 59 -18 38 42 160 0 0 -18 52 24 15 16 11 72 120 -61 -18 34 51 -19 9 58 -18 2 15 -19 42 41 161 0 0 -19 55 47 15 15 56 74 118 -61 -19 38 17 -20 13 18 -19 5 47 -20 45 54 162 0 0 -20 58 23 15 15 42 75 116 -60 -20 40 57 -21 15 50 -20 8 33 -21 48 21 163 0 0 -22 0 10 15 15 27 76 113 -59 -21 42 47 -22 17 33 -21 10 30 -22 49 56 164 0 0 -23 1 4 15 15 12 77 110 -58 -22 43 46 -23 18 24 -22 11 37 -23 50 40 165 0 0 -24 1 5 15 14 58 78 106 -57 -23 43 51 -24 18 20 -23 11 50 -24 50 28 166 0 0 -25 0 10 15 14 44 79 102 -56 -24 43 0 -25 17 21 -24 11 8 -25 49 20 167 0 0 -25 58 18 15 14 30 80 97 -55 -25 41 13 -26 15 23 -25 9 29 -26 47 14 168 0 0 -26 55 26 15 14 16 81 91 -54 -26 38 26 -27 12 27 -26 6 51 -27 44 8 169 0 0 -27 51 34 15 14 2 82 84 -53 -27 34 39 -28 8 30 -27 3 14 -28 40 1 170 0 0 -28 46 40 15 13 48 83 75 -52 -28 29 51 -29 3 30 -27 58 35 -29 34 52 171 0 0 -29 40 44 15 13 35 83 66 -51 -29 24 0 -29 57 28 -28 52 55 -30 28 40 172 0 0 -30 33 44 15 13 21 83 55 -50 -30 17 5 -30 50 23 -29 46 11 -31 21 24 173 0 0 -31 25 39 15 13 8 83 44 -49 -31 9 7 -31 42 13 -30 38 23 -32 13 3 174 0 0 -32 16 31 15 12 55 83 33 -48 -32 0 4 -32 32 58 -31 29 31 -33 3 37 175 0 0 -33 6 17 15 12 42 83 23 -47 -32 49 56 -33 22 38 -32 19 35 -33 53 5 176 0 0 -33 54 57 15 12 30 82 14 -46 -33 38 43 -34 11 12 -33 8 33 -34 41 28 177 0 0 -34 42 33 15 12 17 82 7 -45 -34 26 25 -34 58 41 -33 56 26 -35 28 46 178 0 0 -35 29 3 15 12 5 81 1 -45 -35 13 1 -35 45 5 -34 43 14 -36 14 57 179 0 0 -36 14 27 15 11 53 80 355 -44 -35 58 32 -36 30 24 -35 28 58 -37 0 4 180 0 0 -36 58 47 15 11 42 79 351 -43 -36 42 59 -37 14 37 -36 13 36 -37 44 5 -179 0 0 -37 42 3 15 11 30 79 347 -42 -37 26 20 -37 57 46 -36 57 10 -38 27 2 -178 0 0 -38 24 14 15 11 19 78 344 -41 -38 8 38 -38 39 50 -37 39 39 -39 8 54 -177 0 0 -39 5 21 15 11 8 77 341 -40 -38 49 52 -39 20 51 -38 21 5 -39 49 43 -176 0 0 -39 45 26 15 10 57 76 338 -39 -39 30 3 -40 0 49 -39 1 29 -40 29 29 -175 0 0 -40 24 28 15 10 47 75 336 -38 -40 9 12 -40 39 45 -39 40 49 -41 8 12 -174 0 0 -41 2 28 15 10 36 74 334 -38 -40 47 19 -41 17 39 -40 19 9 -41 45 54 -173 0 0 -41 39 28 15 10 26 73 332 -37 -41 24 25 -41 54 32 -40 56 27 -42 22 35 -172 0 0 -42 15 28 15 10 16 72 330 -36 -42 0 31 -42 30 25 -41 32 45 -42 58 16 -171 0 0 -42 50 29 15 10 6 72 329 -35 -42 35 38 -43 5 20 -42 8 4 -43 32 59 -170 0 0 -43 24 31 15 9 57 71 327 -34 -43 9 47 -43 39 16 -42 42 25 -44 6 43 -169 0 0 -43 57 36 15 9 47 70 326 -34 -43 42 59 -44 12 15 -43 15 48 -44 39 30 -168 0 0 -44 29 45 15 9 38 69 324 -33 -44 15 14 -44 44 17 -43 48 14 -45 11 21 -167 0 0 -45 0 59 15 9 29 68 323 -32 -44 46 33 -45 15 24 -44 19 45 -45 42 16 -166 0 0 -45 31 18 15 9 21 67 322 -31 -45 16 58 -45 45 37 -44 50 22 -46 12 18 -165 0 0 -46 0 43 15 9 12 67 321 -31 -45 46 30 -46 14 57 -45 20 5 -46 41 26 -164 0 0 -46 29 17 15 9 4 66 319 -30 -46 15 9 -46 43 24 -45 48 55 -47 9 43 -163 0 0 -46 56 58 15 8 55 65 318 -29 -46 42 57 -47 11 0 -46 16 53 -47 37 8 -162 0 0 -47 23 50 15 8 47 64 317 -29 -47 9 54 -47 37 46 -46 44 1 -48 3 43 -161 0 0 -47 49 52 15 8 39 64 316 -28 -47 36 2 -48 3 42 -47 10 19 -48 29 28 -160 0 0 -48 15 5 15 8 32 63 315 -27 -48 1 21 -48 28 50 -47 35 48 -48 54 26 -159 0 0 -48 39 31 15 8 24 62 314 -26 -48 25 52 -48 53 11 -48 0 30 -49 18 36 -158 0 0 -49 3 11 15 8 17 61 313 -26 -48 49 37 -49 16 45 -48 24 25 -49 42 1 -157 0 0 -49 26 4 15 8 10 61 312 -25 -49 12 36 -49 39 33 -48 47 33 -50 4 39 -156 0 0 -49 48 14 15 8 2 60 311 -25 -49 34 50 -50 1 37 -49 9 57 -50 26 34 -155 0 0 -50 9 39 15 7 56 59 310 -24 -49 56 20 -50 22 58 -49 31 37 -50 47 45 -154 0 0 -50 30 21 15 7 49 58 309 -23 -50 17 8 -50 43 35 -49 52 33 -51 8 13 -153 0 0 -50 50 22 15 7 42 58 308 -23 -50 37 13 -51 3 31 -50 12 47 -51 28 0 -152 0 0 -51 9 41 15 7 36 57 307 -22 -50 56 37 -51 22 46 -50 32 19 -51 47 6 -151 0 0 -51 28 20 15 7 29 56 306 -21 -51 15 20 -51 41 20 -50 51 11 -52 5 32 -150 0 0 -51 46 19 15 7 23 56 305 -21 -51 33 24 -51 59 15 -51 9 23 -52 23 19 -149 0 0 -52 3 40 15 7 17 55 304 -20 -51 50 49 -52 16 31 -51 26 55 -52 40 27 -148 0 0 -52 20 22 15 7 11 54 303 -20 -52 7 35 -52 33 9 -51 43 50 -52 56 58 -147 0 0 -52 36 27 15 7 5 54 303 -19 -52 23 44 -52 49 11 -52 0 6 -53 12 51 -146 0 0 -52 51 56 15 6 59 53 302 -18 -52 39 17 -53 4 35 -52 15 46 -53 28 9 -145 0 0 -53 6 49 15 6 53 53 301 -18 -52 54 13 -53 19 24 -52 30 50 -53 42 51 -144 0 0 -53 21 6 15 6 48 52 300 -17 -53 8 35 -53 33 38 -52 45 17 -53 56 58 -143 0 0 -53 34 49 15 6 42 51 299 -17 -53 22 21 -53 47 17 -52 59 10 -54 10 30 -142 0 0 -53 47 58 15 6 37 51 298 -16 -53 35 33 -54 0 23 -53 12 29 -54 23 30 -141 0 0 -54 0 33 15 6 31 50 297 -16 -53 48 12 -54 12 55 -53 25 14 -54 35 56 -140 0 0 -54 12 36 15 6 26 49 296 -15 -54 0 18 -54 24 55 -53 37 25 -54 47 49 -139 0 0 -54 24 6 15 6 21 49 295 -15 -54 11 51 -54 36 22 -53 49 4 -54 59 11 -138 0 0 -54 35 5 15 6 16 48 294 -14 -54 22 52 -54 47 17 -54 0 11 -55 10 1 -137 0 0 -54 45 32 15 6 11 48 294 -14 -54 33 23 -54 57 42 -54 10 46 -55 20 20 -136 0 0 -54 55 29 15 6 6 47 293 -13 -54 43 22 -55 7 36 -54 20 50 -55 30 9 -135 0 0 -55 4 55 15 6 2 47 292 -13 -54 52 50 -55 16 59 -54 30 24 -55 39 28 -134 0 0 -55 13 51 15 5 57 46 291 -12 -55 1 49 -55 25 53 -54 39 27 -55 48 17 -133 0 0 -55 22 17 15 5 52 45 290 -11 -55 10 18 -55 34 17 -54 48 0 -55 56 37 -132 0 0 -55 30 15 15 5 48 45 289 -11 -55 18 17 -55 42 13 -54 56 3 -56 4 29 -131 0 0 -55 37 43 15 5 43 44 288 -10 -55 25 48 -55 49 39 -55 3 38 -56 11 51 -130 0 0 -55 44 43 15 5 39 44 288 -10 -55 32 50 -55 56 37 -55 10 43 -56 18 46 -129 0 0 -55 51 15 15 5 34 43 287 -9 -55 39 24 -56 3 8 -55 17 20 -56 25 13 -128 0 0 -55 57 20 15 5 30 43 286 -9 -55 45 29 -56 9 10 -55 23 29 -56 31 12 -127 0 0 -56 2 56 15 5 26 42 285 -8 -55 51 7 -56 14 45 -55 29 10 -56 36 44 -126 0 0 -56 8 5 15 5 22 41 284 -8 -55 56 18 -56 19 53 -55 34 23 -56 41 49 -125 0 0 -56 12 47 15 5 18 41 283 -7 -56 1 1 -56 24 33 -55 39 9 -56 46 28 -124 0 0 -56 17 2 15 5 14 40 282 -7 -56 5 18 -56 28 47 -55 43 28 -56 50 39 -123 0 0 -56 20 51 15 5 10 40 281 -6 -56 9 7 -56 32 35 -55 47 19 -56 54 25 -122 0 0 -56 24 13 15 5 6 39 281 -6 -56 12 30 -56 35 56 -55 50 44 -56 57 44 -121 0 0 -56 27 8 15 5 2 39 280 -6 -56 15 26 -56 38 50 -55 53 41 -57 0 37 -120 0 0 -56 29 37 15 4 58 38 279 -5 -56 17 56 -56 41 18 -55 56 12 -57 3 4 -119 0 0 -56 31 40 15 4 54 38 278 -5 -56 19 59 -56 43 21 -55 58 17 -57 5 5 -118 0 0 -56 33 17 15 4 51 37 277 -4 -56 21 37 -56 44 57 -55 59 55 -57 6 40 -117 0 0 -56 34 27 15 4 47 37 276 -4 -56 22 48 -56 46 7 -56 1 7 -57 7 50 -116 0 0 -56 35 12 15 4 43 36 276 -3 -56 23 33 -56 46 52 -56 1 52 -57 8 34 -115 0 0 -56 35 31 15 4 40 35 275 -3 -56 23 51 -56 47 11 -56 2 11 -57 8 53 -114 0 0 -56 35 24 15 4 36 35 274 -2 -56 23 44 -56 47 3 -56 2 4 -57 8 45 -113 0 0 -56 34 50 15 4 33 34 273 -2 -56 23 11 -56 46 30 -56 1 30 -57 8 12 -112 0 0 -56 33 51 15 4 29 34 272 -1 -56 22 11 -56 45 31 -56 0 30 -57 7 14 -111 0 0 -56 32 25 15 4 26 33 271 -1 -56 20 45 -56 44 6 -55 59 4 -57 5 49 -110 0 0 -56 30 34 15 4 23 33 270 0 -56 18 53 -56 42 15 -55 57 10 -57 3 59 Uncertainty in time = +/- 4 secs [Prediction of 2008 Apr 23.0] Data for the target star ------------------------ * name: TYC 6850-02001-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 07 14.5170 DE: -26 37 39.322 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .022 ) * V mag [mag]: 11.5 * B mag [mag]: 11.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (132) Aethra approx. diameter [km]: 43 approx. diameter ["]: .038 distance from Earth [AU]: 1.56000 * orbital information: orbit source: Preston date of fit: 2008 Apr 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 869 number of rejected observations: 52 time covered by the observations: 1932 Jun 21 - 2008 Apr 18 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.010, 60° remarks: * orbital elements for (132) Aethra : Mean anomaly = 55.67385291 deg Arg. of pericenter = 254.40460872 deg Long. of node = 258.91553309 deg Inclination = 25.05053249 deg Eccentricity = 0.38799333 Semimajor axis = 2.60969205 AU Perihelion dist = 1.59714894 AU Mag: H = 8.91, G = 0.15 Epoch of elements : MJD 54593.63400000 TDT (2008 May 07.634) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 7 132 Aethra 15h 13.2m UT 11.5 18 7 14.517-26 37 39.32TYC 6850-02001-1 11.6 13.1 43 4.3 1.560 -1.706 22.23 177.6792 -26.634 -49.16 17.04 15.2198 -0.07554 -0.07846 -4.05428 3.94289 -0.00383 0.00017 2000 54.8242712008 5 4.00000254.404609258.915533 25.0505320.38799333 2.6096921 1.5971489 9.4 5.00.15 RATE 2.3378690 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.038 0.024 69 1.93 0.035 0 54579.5020080507_2001-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 23, 04:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org