IOTA/IOTA-ES occultation update for (189) Phthia / TYC 6254-01222-1 event on 2023 Sep 21, 04:00 UT Visible from USA Summary ------- On 2023 Sep 21 UT, the 40.1 km diameter asteroid (189) Phthia will occult a 10.8 mag star in the constellation Sagittarius for observers along a path across USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.37 mag to 14.09 mag (the magnitude of the asteroid) for at most 2.430 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. The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2023 Sep 21, 03:55 - 2023 Sep 21, 04:04 * geocentric midpoint of event [JD]: 2460208.66667096 * magnitude of target star: 10.77 * magnitude drop [mag]: 3.37 * estimated maximum duration [s]: 2.430 * Moon: 32 % sunlit, 25° distance * Sun: 92° distance * rough path description: USA The occultation path -------------------- * approximate projected width [km]: 65 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.001", 88°) * approx speed of asteroid's shadow [km/s]: 16.5998 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6254-01222-1 by 189 Phthia on 2023 Sep 21 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 148 59 59 55 9 34 3 56 3.5 0 122 31 54 49 0 55 30 19 54 46 34 55 32 48 .... 149 59 59 54 47 55 3 56 3.6 1 123 31 54 27 22 55 8 40 54 24 56 55 11 9 -0.54 150 59 59 54 26 7 3 56 3.7 2 124 31 54 5 34 54 46 51 54 3 8 54 49 20 -0.84 151 59 59 54 4 10 3 56 4.0 2 125 30 53 43 38 54 24 53 53 41 12 54 27 22 -0.97 152 59 59 53 42 4 3 56 4.3 3 125 30 53 21 33 54 2 46 53 19 7 54 5 15 -1.03 153 59 59 53 19 51 3 56 4.7 4 126 30 52 59 20 53 40 32 52 56 55 53 43 0 -1.08 154 59 59 52 57 30 3 56 5.3 4 127 30 52 37 1 53 18 10 52 34 35 53 20 38 -1.10 155 59 59 52 35 3 3 56 5.9 5 128 30 52 14 35 52 55 41 52 12 10 52 58 9 -1.12 156 59 59 52 12 29 3 56 6.6 6 129 30 51 52 3 52 33 7 51 49 38 52 35 35 -1.14 157 59 59 51 49 51 3 56 7.4 7 130 30 51 29 26 52 10 27 51 27 1 52 12 54 -1.15 158 59 59 51 27 9 3 56 8.4 7 130 29 51 6 46 51 47 43 51 4 21 51 50 10 -1.17 159 59 59 51 4 22 3 56 9.4 8 131 29 50 44 1 51 24 54 50 41 36 51 27 22 -1.17 160 59 59 50 41 32 3 56 10.6 9 132 29 50 21 13 51 2 2 50 18 48 51 4 29 -1.18 161 59 59 50 18 39 3 56 11.9 9 133 29 49 58 22 50 39 7 49 55 58 50 41 34 -1.19 162 59 59 49 55 45 3 56 13.2 10 133 28 49 35 30 50 16 11 49 33 6 50 18 37 -1.19 163 59 59 49 32 49 3 56 14.7 11 134 28 49 12 36 49 53 13 49 10 13 49 55 39 -1.20 164 59 59 49 9 53 3 56 16.3 12 135 28 48 49 43 49 30 15 48 47 19 49 32 41 -1.20 165 59 59 48 46 58 3 56 18.0 12 136 28 48 26 50 49 7 17 48 24 27 49 9 43 -1.20 166 59 59 48 24 4 3 56 19.9 13 137 27 48 3 58 48 44 20 48 1 35 48 46 45 -1.21 167 59 59 48 1 11 3 56 21.8 14 138 27 47 41 8 48 21 25 47 38 46 48 23 50 -1.21 168 59 59 47 38 21 3 56 23.9 15 138 27 47 18 21 47 58 32 47 15 58 48 0 57 -1.21 169 59 59 47 15 35 3 56 26.1 15 139 26 46 55 37 47 35 43 46 53 15 47 38 8 -1.22 170 59 59 46 52 53 3 56 28.4 16 140 26 46 32 57 47 12 58 46 30 36 47 15 22 -1.22 171 59 59 46 30 15 3 56 30.8 17 141 25 46 10 23 46 50 17 46 8 1 46 52 41 -1.22 172 59 59 46 7 43 3 56 33.3 18 142 25 45 47 53 46 27 42 45 45 33 46 30 6 -1.22 173 59 59 45 45 17 3 56 35.9 18 142 24 45 25 31 46 5 14 45 23 10 46 7 37 -1.22 174 59 59 45 22 59 3 56 38.7 19 143 24 45 3 15 45 42 52 45 0 55 45 45 15 -1.23 175 59 59 45 0 48 3 56 41.6 20 144 23 44 41 8 45 20 39 44 38 48 45 23 1 -1.23 176 59 59 44 38 46 3 56 44.6 20 145 23 44 19 9 44 58 34 44 16 49 45 0 55 -1.23 177 59 59 44 16 54 3 56 47.7 21 146 22 43 57 19 44 36 38 43 55 0 44 38 59 -1.23 178 59 59 43 55 11 3 56 50.9 22 147 22 43 35 40 44 14 52 43 33 21 44 17 13 -1.23 -180 0 1 43 33 39 3 56 54.3 23 148 21 43 14 11 43 53 17 43 11 53 43 55 38 -1.23 -179 0 1 43 12 19 3 56 57.7 23 148 21 42 52 54 43 31 53 42 50 36 43 34 14 -1.24 -178 0 1 42 51 11 3 57 1.3 24 149 20 42 31 49 43 10 42 42 29 31 43 13 2 -1.24 -177 0 1 42 30 15 3 57 4.9 25 150 20 42 10 57 42 49 43 42 8 40 42 52 3 -1.24 -176 0 1 42 9 34 3 57 8.7 25 151 19 41 50 18 42 28 58 41 48 1 42 31 17 -1.24 -175 0 1 41 49 6 3 57 12.6 26 152 18 41 29 54 42 8 27 41 27 37 42 10 46 -1.24 -174 0 1 41 28 53 3 57 16.6 27 153 18 41 9 44 41 48 11 41 7 28 41 50 30 -1.24 -173 0 1 41 8 56 3 57 20.6 27 154 17 40 49 50 41 28 11 40 47 35 41 30 29 -1.24 -172 0 1 40 49 15 3 57 24.8 28 155 16 40 30 12 41 8 27 40 27 57 41 10 44 -1.24 -171 0 1 40 29 51 3 57 29.1 28 156 16 40 10 51 40 48 59 40 8 36 40 51 16 -1.25 -170 0 1 40 10 44 3 57 33.5 29 157 15 39 51 48 40 29 49 39 49 33 40 32 6 -1.25 -169 0 1 39 51 55 3 57 38.0 30 158 14 39 33 2 40 10 57 39 30 47 40 13 13 -1.25 -168 0 1 39 33 25 3 57 42.5 30 159 14 39 14 35 39 52 23 39 12 21 39 54 39 -1.25 -167 0 1 39 15 13 3 57 47.2 31 160 13 38 56 26 39 34 9 38 54 13 39 36 25 -1.25 -166 0 1 38 57 22 3 57 51.9 31 161 12 38 38 38 39 16 14 38 36 25 39 18 30 -1.25 -165 0 1 38 39 50 3 57 56.7 32 162 11 38 21 9 38 58 40 38 18 56 39 0 55 -1.25 -164 0 1 38 22 40 3 58 1.6 32 163 11 38 4 1 38 41 26 38 1 49 38 43 41 -1.25 -163 0 1 38 5 50 3 58 6.5 33 164 10 37 47 15 38 24 34 37 45 3 38 26 48 -1.25 -162 0 1 37 49 22 3 58 11.6 33 165 9 37 30 50 38 8 3 37 28 38 38 10 17 -1.26 -161 0 1 37 33 17 3 58 16.7 34 166 8 37 14 47 37 51 54 37 12 36 37 54 8 -1.26 -160 0 1 37 17 34 3 58 21.9 34 167 7 36 59 7 37 36 8 36 56 56 37 38 22 -1.26 -159 0 1 37 2 14 3 58 27.1 35 168 7 36 43 50 37 20 46 36 41 39 37 22 59 -1.26 -158 0 1 36 47 17 3 58 32.4 35 170 6 36 28 56 37 5 46 36 26 45 37 7 59 -1.26 -157 0 1 36 32 45 3 58 37.8 35 171 5 36 14 26 36 51 11 36 12 15 36 53 23 -1.26 -156 0 1 36 18 36 3 58 43.2 36 172 4 36 0 20 36 37 0 35 58 10 36 39 12 -1.26 -155 0 1 36 4 53 3 58 48.6 36 173 3 35 46 39 36 23 14 35 44 29 36 25 26 -1.26 -154 0 1 35 51 34 3 58 54.1 36 174 3 35 33 22 36 9 53 35 31 13 36 12 4 -1.26 -153 0 1 35 38 41 3 58 59.7 37 176 2 35 20 32 35 56 57 35 18 22 35 59 8 -1.26 -152 0 1 35 26 13 3 59 5.2 37 177 1 35 8 6 35 44 27 35 5 57 35 46 38 -1.26 -151 0 1 35 14 12 3 59 10.9 37 178 0 34 56 7 35 32 24 34 53 58 35 34 34 -1.26 -150 0 1 35 2 36 3 59 16.5 37 179 -1 34 44 34 35 20 46 34 42 25 35 22 56 -1.27 -149 0 1 34 51 28 3 59 22.2 38 180 -2 34 33 27 35 9 36 34 31 19 35 11 45 -1.27 -148 0 1 34 40 46 3 59 27.9 38 182 -2 34 22 47 34 58 52 34 20 40 35 1 1 -1.27 -147 0 1 34 30 31 3 59 33.6 38 183 -3 34 12 35 34 48 35 34 10 27 34 50 45 -1.27 -146 0 1 34 20 44 3 59 39.4 38 184 -4 34 2 49 34 38 46 34 0 42 34 40 55 -1.27 -145 0 1 34 11 24 3 59 45.1 38 185 -5 33 53 31 34 29 25 33 51 24 34 31 34 -1.27 -144 0 1 34 2 33 3 59 50.9 38 187 -6 33 44 41 34 20 31 33 42 34 34 22 40 -1.27 -143 0 1 33 54 9 3 59 56.7 38 188 -7 33 36 19 34 12 6 33 34 12 34 14 14 -1.27 -142 0 1 33 46 13 4 0 2.5 38 189 -8 33 28 25 34 4 9 33 26 18 34 6 17 -1.27 -141 0 1 33 38 46 4 0 8.2 38 190 -8 33 20 59 33 56 40 33 18 53 33 58 48 -1.27 -140 0 1 33 31 47 4 0 14.0 38 192 -9 33 14 2 33 49 40 33 11 55 33 51 48 -1.27 -139 0 1 33 25 17 4 0 19.8 38 193 -10 33 7 33 33 43 9 33 5 27 33 45 17 -1.27 -138 0 1 33 19 16 4 0 25.5 38 194 -11 33 1 33 33 37 6 32 59 27 33 39 14 -1.27 -137 0 1 33 13 44 4 0 31.3 38 195 -12 32 56 2 33 31 33 32 53 56 33 33 41 -1.27 -136 0 1 33 8 41 4 0 37.0 38 197 -13 32 51 0 33 26 29 32 48 54 33 28 37 -1.27 -135 0 1 33 4 7 4 0 42.7 38 198 -14 32 46 27 33 21 54 32 44 21 33 24 2 -1.27 -134 0 1 33 0 2 4 0 48.4 37 199 -14 32 42 23 33 17 49 32 40 17 33 19 56 -1.27 -133 0 1 32 56 27 4 0 54.0 37 200 -15 32 38 48 33 14 13 32 36 43 33 16 20 -1.27 -132 0 1 32 53 21 4 0 59.6 37 201 -16 32 35 43 33 11 6 32 33 38 33 13 13 -1.27 -131 0 1 32 50 45 4 1 5.2 37 202 -17 32 33 7 33 8 29 32 31 2 33 10 36 -1.27 -130 0 1 32 48 38 4 1 10.7 36 204 -18 32 31 1 33 6 21 32 28 55 33 8 29 -1.27 -129 0 1 32 47 0 4 1 16.2 36 205 -19 32 29 23 33 4 44 32 27 18 33 6 51 -1.28 -128 0 1 32 45 52 4 1 21.7 36 206 -20 32 28 16 33 3 35 32 26 10 33 5 42 -1.28 -127 0 1 32 45 14 4 1 27.1 35 207 -20 32 27 37 33 2 57 32 25 32 33 5 4 -1.28 -126 0 1 32 45 5 4 1 32.4 35 208 -21 32 27 29 33 2 48 32 25 23 33 4 54 -1.28 -125 0 1 32 45 25 4 1 37.7 34 209 -22 32 27 49 33 3 8 32 25 44 33 5 15 -1.28 -124 0 1 32 46 15 4 1 43.0 34 210 -23 32 28 39 33 3 58 32 26 34 33 6 5 -1.28 -123 0 1 32 47 35 4 1 48.1 33 211 -24 32 29 58 33 5 18 32 27 53 33 7 25 -1.28 -122 0 1 32 49 24 4 1 53.2 33 212 -24 32 31 47 33 7 7 32 29 42 33 9 14 -1.28 -121 0 1 32 51 42 4 1 58.3 33 213 -25 32 34 5 33 9 26 32 32 0 33 11 33 -1.28 -120 0 1 32 54 29 4 2 3.2 32 214 -26 32 36 52 33 12 13 32 34 47 33 14 20 -1.28 -119 0 1 32 57 46 4 2 8.1 31 215 -27 32 40 8 33 15 31 32 38 3 33 17 38 -1.28 -118 0 1 33 1 32 4 2 13.0 31 216 -28 32 43 53 33 19 17 32 41 48 33 21 24 -1.28 -117 0 1 33 5 46 4 2 17.7 30 217 -28 32 48 7 33 23 32 32 46 1 33 25 40 -1.28 -116 0 1 33 10 30 4 2 22.4 30 218 -29 32 52 50 33 28 17 32 50 44 33 30 24 -1.28 -115 0 1 33 15 42 4 2 26.9 29 219 -30 32 58 1 33 33 30 32 55 56 33 35 37 -1.28 -114 0 1 33 21 23 4 2 31.4 29 220 -31 33 3 41 33 39 12 33 1 35 33 41 19 -1.28 -113 0 1 33 27 32 4 2 35.8 28 221 -31 33 9 50 33 45 22 33 7 44 33 47 30 -1.28 -112 0 1 33 34 10 4 2 40.1 27 222 -32 33 16 26 33 52 1 33 14 20 33 54 9 -1.28 -111 0 1 33 41 16 4 2 44.3 27 222 -33 33 23 31 33 59 8 33 21 24 34 1 16 -1.28 -110 0 1 33 48 49 4 2 48.4 26 223 -34 33 31 3 34 6 43 33 28 57 34 8 51 -1.28 -109 0 1 33 56 51 4 2 52.4 25 224 -34 33 39 3 34 14 46 33 36 56 34 16 54 -1.28 -108 0 1 34 5 20 4 2 56.3 25 225 -35 33 47 31 34 23 16 33 45 24 34 25 25 -1.28 -107 0 1 34 14 16 4 3 0.1 24 226 -36 33 56 25 34 32 14 33 54 18 34 34 23 -1.28 -106 0 1 34 23 40 4 3 3.8 23 226 -36 34 5 47 34 41 39 34 3 40 34 43 48 -1.28 -105 0 1 34 33 30 4 3 7.4 22 227 -37 34 15 36 34 51 31 34 13 28 34 53 40 -1.28 -104 0 1 34 43 47 4 3 10.9 22 228 -37 34 25 51 35 1 50 34 23 43 35 3 59 -1.28 -103 0 1 34 54 30 4 3 14.2 21 229 -38 34 36 32 35 12 35 34 34 24 35 14 45 -1.28 -102 0 1 35 5 39 4 3 17.5 20 229 -39 34 47 40 35 23 46 34 45 32 35 25 56 -1.28 -101 0 1 35 17 14 4 3 20.6 19 230 -39 34 59 13 35 35 23 34 57 4 35 37 34 -1.28 -100 0 1 35 29 15 4 3 23.6 19 231 -40 35 11 11 35 47 26 35 9 2 35 49 36 -1.28 - 99 0 1 35 41 40 4 3 26.5 18 232 -40 35 23 34 35 59 54 35 21 26 36 2 4 -1.28 - 98 0 1 35 54 31 4 3 29.3 17 232 -41 35 36 22 36 12 46 35 34 13 36 14 57 -1.28 - 97 0 1 36 7 45 4 3 31.9 16 233 -41 35 49 35 36 26 3 35 47 26 36 28 15 -1.28 - 96 0 1 36 21 24 4 3 34.4 16 234 -42 36 3 12 36 39 45 36 1 2 36 41 56 -1.28 - 95 0 1 36 35 27 4 3 36.8 15 234 -42 36 17 12 36 53 50 36 15 2 36 56 2 -1.28 - 94 0 1 36 49 53 4 3 39.1 14 235 -42 36 31 35 37 8 18 36 29 25 37 10 30 -1.28 - 93 0 1 37 4 42 4 3 41.2 13 236 -43 36 46 22 37 23 10 36 44 11 37 25 22 -1.29 - 92 0 1 37 19 53 4 3 43.2 12 236 -43 37 1 30 37 38 24 36 59 20 37 40 37 -1.29 - 91 0 1 37 35 27 4 3 45.1 12 237 -44 37 17 1 37 54 0 37 14 50 37 56 13 -1.29 - 90 0 1 37 51 22 4 3 46.9 11 238 -44 37 32 54 38 9 58 37 30 43 38 12 12 -1.29 - 89 0 1 38 7 39 4 3 48.5 10 238 -44 37 49 8 38 26 18 37 46 56 38 28 31 -1.29 - 88 0 1 38 24 16 4 3 50.0 9 239 -44 38 5 42 38 42 58 38 3 30 38 45 12 -1.30 - 87 0 1 38 41 14 4 3 51.4 8 240 -45 38 22 37 38 59 59 38 20 25 39 2 13 -1.30 - 86 0 0 38 58 31 4 3 52.6 7 240 -45 38 39 52 39 17 19 38 37 39 39 19 34 -1.30 - 85 0 0 39 16 8 4 3 53.7 7 241 -45 38 57 26 39 34 59 38 55 13 39 37 14 -1.31 - 84 0 0 39 34 4 4 3 54.7 6 241 -45 39 15 19 39 52 58 39 13 5 39 55 13 -1.31 - 83 0 0 39 52 18 4 3 55.5 5 242 -45 39 33 30 40 11 15 39 31 16 40 13 30 -1.32 - 82 0 0 40 10 50 4 3 56.2 4 243 -45 39 51 58 40 29 49 39 49 44 40 32 6 -1.33 - 81 0 0 40 29 38 4 3 56.8 3 243 -46 40 10 44 40 48 41 40 8 30 40 50 58 -1.35 - 80 0 0 40 48 44 4 3 57.3 3 244 -46 40 29 47 41 7 50 40 27 32 41 10 7 -1.38 - 79 0 0 41 8 6 4 3 57.6 2 245 -46 40 49 5 41 27 15 40 46 50 41 29 32 -1.44 - 78 0 0 41 27 43 4 3 57.8 1 245 -46 41 8 39 41 46 55 41 6 24 41 49 13 -1.60 - 77 0 0 41 47 35 4 3 57.8 0 246 -46 41 28 28 .. .. .. 41 26 12 .. .. .. -5.35 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 26.9 Data for the target star ------------------------ * name: TYC 6254-01222-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 59 47.8897 DE: -17 38 56.575 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 59 47.8896 DE: -17 38 56.575 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.8 * B mag [mag]: 11.7 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (189) Phthia asteroid class: approx. diameter [km]: 40 approx. diameter ["]: 0.026 distance from Earth [AU]: 2.17150 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#105 date of fit: 2023 Aug 22 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.008", 0.001", 87.7° remarks: * orbital elements for (189)Phthia : Mean anomaly = 285.5888003281 deg Arg. of pericenter = 169.5367731013 deg Long. of node = 203.3428852130 deg Inclination = 5.1756970025 deg Eccentricity = 0.0359842545 Semimajor axis = 2.4500489723 AU Perihelion dist = 2.3618857865 AU Mag: H = 9.44, G = 0.15 Epoch of elements : MJD 60208.16666671 TDT (2023 Sep 21.1667) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1052023Aug22,2.43,2023,9,21,4.000103,0.103184,0.777563,9.287713,-1.234532,0.005561,-0.000006,0.000000,0.000000 -149.4871,-17.6506,118.32,0.82,False TYC 6254-01222-1,17.99663605,-17.6490485,11.72,10.77,10.26,0.1,0,,18.01955679,-17.6506077,3.37,3.43,0,0,0 189,Phthia,14.09,40.268,2.1715,0,0,2.632,-5.00,,2.2,0 0,285.5460,2023,9,21,169.5368,203.3429,5.1757,0.03598,2.45005,2.36189,9.34,5.0,0.15 1.059,0.0080,0.0007,88,0.0080,Known errors,0.81,0,-1,-1 20230921_1222-1,60182.92 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 22:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org