IOTA/IOTA-ES occultation update for (3502) Huangpu / UCAC4 332-138540 event on 2024 Oct 26, 16:25 UT Visible from Summary ------- On 2024 Oct 26 UT, the 21.900724308528 km diameter asteroid (3502) Huangpu will occult a 11.1 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.30 mag to 17.39 mag (the magnitude of the asteroid) for at most 0.690 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: 99 * date and approx. time of event: 2024 Oct 26, 16:22 - 2024 Oct 26, 16:27 * geocentric midpoint of event [JD]: 2460610.18412796 * magnitude of target star: 11.09 * magnitude drop [mag]: 6.30 * estimated maximum duration [s]: 0.690 * Moon: 28 % sunlit, 124° distance * Sun: 60° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 29 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.021, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.003", 92°) * approx speed of asteroid's shadow [km/s]: 33.5114 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 332-138540 by 3502 Huangpu on 2024 Oct 26 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 - 79 0 0 33 49 1 16 22 38.7 1 119 43 33 40 3 33 58 1 33 35 15 34 2 51 .... - 78 0 0 33 21 20 16 22 38.7 1 120 43 33 12 22 33 30 19 33 7 35 33 35 8 -0.39 - 77 0 0 32 53 43 16 22 38.9 2 120 44 32 44 46 33 2 41 32 39 59 33 7 29 -0.54 - 76 0 0 32 26 11 16 22 39.1 3 121 45 32 17 15 32 35 7 32 12 29 32 39 55 -0.60 - 75 0 0 31 58 44 16 22 39.3 4 121 45 31 49 49 32 7 40 31 45 4 32 12 27 -0.64 - 74 0 0 31 31 24 16 22 39.7 5 122 46 31 22 31 31 40 19 31 17 45 31 45 6 -0.66 - 73 0 0 31 4 12 16 22 40.1 6 123 46 30 55 19 31 13 6 30 50 35 31 17 52 -0.68 - 72 0 0 30 37 8 16 22 40.6 7 123 47 30 28 17 30 46 1 30 23 33 30 50 46 -0.69 - 71 0 0 30 10 13 16 22 41.1 8 124 47 30 1 23 30 19 5 29 56 40 30 23 50 -0.70 - 70 0 0 29 43 28 16 22 41.7 9 124 48 29 34 39 29 52 19 29 29 57 29 57 3 -0.71 - 69 0 0 29 16 54 16 22 42.4 10 125 48 29 8 6 29 25 43 29 3 24 29 30 27 -0.72 - 68 0 0 28 50 32 16 22 43.2 11 125 48 28 41 45 28 59 20 28 37 4 29 4 3 -0.72 - 67 0 0 28 24 22 16 22 44.0 12 126 49 28 15 36 28 33 8 28 10 56 28 37 51 -0.73 - 66 0 0 27 58 25 16 22 44.9 13 126 49 27 49 41 28 7 10 27 45 1 28 11 52 -0.73 - 65 0 0 27 32 42 16 22 45.9 14 127 50 27 23 59 27 41 26 27 19 20 27 46 7 -0.73 - 64 0 0 27 7 14 16 22 46.9 15 127 50 26 58 32 27 15 57 26 53 54 27 20 37 -0.73 - 63 0 0 26 42 1 16 22 48.0 16 128 50 26 33 21 26 50 43 26 28 43 26 55 22 -0.74 - 62 0 0 26 17 5 16 22 49.2 17 128 50 26 8 26 26 25 45 26 3 48 26 30 24 -0.74 - 61 0 0 25 52 25 16 22 50.5 18 129 51 25 43 47 26 1 4 25 39 11 26 5 42 -0.74 - 60 0 0 25 28 3 16 22 51.8 19 129 51 25 19 26 25 36 40 25 14 50 25 41 18 -0.74 - 59 0 0 25 3 59 16 22 53.1 20 130 51 24 55 24 25 12 35 24 50 48 25 17 12 -0.75 - 58 0 0 24 40 13 16 22 54.6 21 130 51 24 31 40 24 48 48 24 27 5 24 53 24 -0.75 - 57 0 0 24 16 48 16 22 56.1 22 131 51 24 8 15 24 25 21 24 3 41 24 29 57 -0.75 - 56 0 0 23 53 42 16 22 57.7 23 131 51 23 45 11 24 2 14 23 40 38 24 6 49 -0.75 - 55 0 0 23 30 57 16 22 59.3 24 132 51 23 22 27 23 39 28 23 17 55 23 44 2 -0.75 - 54 0 0 23 8 34 16 23 1.0 25 132 51 23 0 5 23 17 3 22 55 33 23 21 36 -0.75 - 53 0 0 22 46 32 16 23 2.8 25 133 51 22 38 4 22 55 0 22 33 33 22 59 33 -0.75 - 52 0 0 22 24 52 16 23 4.7 26 134 51 22 16 26 22 33 19 22 11 56 22 37 51 -0.75 - 51 0 0 22 3 36 16 23 6.5 27 134 51 21 55 11 22 12 2 21 50 41 22 16 33 -0.76 - 50 0 0 21 42 43 16 23 8.5 28 135 50 21 34 19 21 51 7 21 29 50 21 55 38 -0.76 - 49 0 0 21 22 14 16 23 10.5 29 135 50 21 13 52 21 30 37 21 9 23 21 35 7 -0.76 - 48 0 0 21 2 9 16 23 12.6 30 136 50 20 53 48 21 10 31 20 49 20 21 15 0 -0.76 - 47 0 0 20 42 29 16 23 14.7 31 137 50 20 34 9 20 50 50 20 29 42 20 55 18 -0.76 - 46 0 0 20 23 15 16 23 16.9 32 137 49 20 14 56 20 31 34 20 10 30 20 36 2 -0.76 - 45 0 0 20 4 26 16 23 19.1 33 138 49 19 56 8 20 12 44 19 51 43 20 17 11 -0.76 - 44 0 0 19 46 3 16 23 21.4 34 139 49 19 37 47 19 54 20 19 33 22 19 58 47 -0.76 - 43 0 0 19 28 7 16 23 23.8 34 139 48 19 19 52 19 36 23 19 15 27 19 40 48 -0.76 - 42 0 0 19 10 37 16 23 26.2 35 140 48 19 2 24 19 18 52 18 58 0 19 23 17 -0.76 - 41 0 0 18 53 35 16 23 28.6 36 141 47 18 45 22 19 1 49 18 40 59 19 6 14 -0.76 - 40 0 0 18 37 1 16 23 31.1 37 141 47 18 28 49 18 45 13 18 24 26 18 49 37 -0.76 - 39 0 0 18 20 54 16 23 33.6 38 142 46 18 12 43 18 29 5 18 8 21 18 33 29 -0.76 - 38 0 0 18 5 15 16 23 36.2 38 143 46 17 57 6 18 13 26 17 52 44 18 17 49 -0.77 - 37 0 0 17 50 5 16 23 38.8 39 144 45 17 41 57 17 58 15 17 37 35 18 2 37 -0.77 - 36 0 0 17 35 24 16 23 41.5 40 145 45 17 27 16 17 43 32 17 22 56 17 47 54 -0.77 - 35 0 0 17 21 12 16 23 44.2 41 145 44 17 13 5 17 29 19 17 8 45 17 33 40 -0.77 - 34 0 0 17 7 28 16 23 46.9 41 146 44 16 59 23 17 15 35 16 55 3 17 19 56 -0.77 - 33 0 0 16 54 15 16 23 49.7 42 147 43 16 46 10 17 2 21 16 41 51 17 6 41 -0.77 - 32 0 0 16 41 31 16 23 52.5 43 148 42 16 33 27 16 49 36 16 29 8 16 53 56 -0.77 - 31 0 0 16 29 17 16 23 55.4 44 149 42 16 21 14 16 37 21 16 16 56 16 41 41 -0.77 - 30 0 0 16 17 33 16 23 58.3 44 150 41 16 9 31 16 25 37 16 5 13 16 29 56 -0.77 - 29 0 0 16 6 20 16 24 1.2 45 151 40 15 58 19 16 14 22 15 54 1 16 18 41 -0.77 - 28 0 0 15 55 37 16 24 4.2 45 152 40 15 47 36 16 3 39 15 43 19 16 7 57 -0.77 - 27 0 0 15 45 25 16 24 7.1 46 153 39 15 37 25 15 53 26 15 33 8 15 57 44 -0.77 - 26 0 0 15 35 43 16 24 10.1 47 154 38 15 27 44 15 43 44 15 23 28 15 48 1 -0.77 - 25 0 0 15 26 33 16 24 13.2 47 156 37 15 18 34 15 34 33 15 14 18 15 38 50 -0.77 - 24 0 0 15 17 54 16 24 16.2 48 157 36 15 9 55 15 25 53 15 5 40 15 30 9 -0.77 - 23 0 0 15 9 45 16 24 19.3 48 158 36 15 1 48 15 17 44 14 57 33 15 22 0 -0.77 - 22 0 0 15 2 9 16 24 22.4 49 159 35 14 54 12 15 10 7 14 49 57 15 14 23 -0.77 - 21 0 0 14 55 4 16 24 25.6 49 160 34 14 47 7 15 3 1 14 42 52 15 7 17 -0.77 - 20 0 0 14 48 30 16 24 28.7 50 162 33 14 40 34 14 56 27 14 36 19 15 0 42 -0.77 - 19 0 0 14 42 28 16 24 31.9 50 163 32 14 34 32 14 50 24 14 30 18 14 54 40 -0.77 - 18 0 0 14 36 57 16 24 35.0 50 164 32 14 29 2 14 44 53 14 24 48 14 49 8 -0.77 - 17 0 0 14 31 58 16 24 38.2 51 166 31 14 24 3 14 39 54 14 19 50 14 44 9 -0.77 - 16 0 0 14 27 32 16 24 41.4 51 167 30 14 19 37 14 35 27 14 15 23 14 39 42 -0.77 - 15 0 0 14 23 37 16 24 44.7 51 169 29 14 15 42 14 31 32 14 11 29 14 35 47 -0.78 - 14 0 0 14 20 14 16 24 47.9 51 170 28 14 12 20 14 28 9 14 8 6 14 32 23 -0.78 - 13 0 0 14 17 23 16 24 51.1 52 172 27 14 9 29 14 25 18 14 5 16 14 29 32 -0.78 - 12 0 0 14 15 4 16 24 54.4 52 173 26 14 7 10 14 22 59 14 2 57 14 27 13 -0.78 - 11 0 0 14 13 17 16 24 57.6 52 175 25 14 5 24 14 21 12 14 1 11 14 25 26 -0.78 - 10 0 0 14 12 3 16 25 0.9 52 176 25 14 4 9 14 19 57 13 59 56 14 24 11 -0.78 - 9 0 0 14 11 20 16 25 4.2 52 178 24 14 3 27 14 19 15 13 59 14 14 23 29 -0.78 - 8 0 0 14 11 10 16 25 7.4 52 179 23 14 3 16 14 19 4 13 59 3 14 23 18 -0.78 - 7 0 0 14 11 32 16 25 10.7 52 181 22 14 3 38 14 19 26 13 59 25 14 23 40 -0.78 - 6 0 0 14 12 25 16 25 13.9 52 182 21 14 4 32 14 20 20 14 0 19 14 24 34 -0.78 - 5 0 0 14 13 51 16 25 17.2 52 184 20 14 5 58 14 21 46 14 1 45 14 26 0 -0.78 - 4 0 0 14 15 49 16 25 20.5 52 185 19 14 7 56 14 23 44 14 3 42 14 27 59 -0.78 - 3 0 0 14 18 20 16 25 23.7 52 187 18 14 10 26 14 26 14 14 6 12 14 30 29 -0.78 - 2 0 0 14 21 22 16 25 27.0 52 188 17 14 13 28 14 29 17 14 9 14 14 33 31 -0.78 - 1 0 0 14 24 56 16 25 30.2 51 190 16 14 17 2 14 32 51 14 12 48 14 37 6 -0.78 0 0 0 14 29 2 16 25 33.4 51 191 15 14 21 7 14 36 58 14 16 54 14 41 13 -0.78 1 0 0 14 33 40 16 25 36.7 51 192 14 14 25 45 14 41 36 14 21 31 14 45 51 -0.78 2 0 0 14 38 50 16 25 39.9 51 194 13 14 30 55 14 46 46 14 26 40 14 51 2 -0.78 3 0 0 14 44 32 16 25 43.1 50 195 12 14 36 36 14 52 28 14 32 21 14 56 44 -0.78 4 0 0 14 50 45 16 25 46.2 50 197 11 14 42 49 14 58 42 14 38 34 15 2 58 -0.78 5 0 0 14 57 30 16 25 49.4 49 198 10 14 49 33 15 5 27 14 45 18 15 9 44 -0.78 6 0 0 15 4 46 16 25 52.5 49 199 9 14 56 49 15 12 44 14 52 34 15 17 1 -0.78 7 0 0 15 12 34 16 25 55.7 49 200 8 15 4 36 15 20 33 15 0 21 15 24 49 -0.78 8 0 0 15 20 53 16 25 58.8 48 202 7 15 12 55 15 28 53 15 8 39 15 33 10 -0.78 9 0 0 15 29 44 16 26 1.9 48 203 6 15 21 45 15 37 44 15 17 29 15 42 1 -0.78 10 0 0 15 39 5 16 26 4.9 47 204 5 15 31 6 15 47 6 15 26 49 15 51 23 -0.78 11 0 0 15 48 58 16 26 7.9 47 205 4 15 40 57 15 56 59 15 36 40 16 1 17 -0.78 12 0 0 15 59 21 16 26 10.9 46 206 3 15 51 20 16 7 23 15 47 3 16 11 41 -0.78 13 0 0 16 10 15 16 26 13.9 45 207 2 16 2 13 16 18 17 15 57 55 16 22 36 -0.78 14 0 0 16 21 39 16 26 16.9 45 208 2 16 13 36 16 29 42 16 9 18 16 34 1 -0.78 15 0 0 16 33 33 16 26 19.8 44 209 1 16 25 30 16 41 38 16 21 11 16 45 57 -0.78 16 0 0 16 45 58 16 26 22.7 43 210 0 16 37 54 16 54 3 16 33 35 16 58 23 -0.78 17 0 0 16 58 52 16 26 25.5 43 211 -1 16 50 47 17 6 58 16 46 28 17 11 19 -0.78 18 0 0 17 12 17 16 26 28.3 42 212 -2 17 4 11 17 20 23 16 59 51 17 24 45 -0.78 19 0 0 17 26 10 16 26 31.1 41 213 -3 17 18 3 17 34 18 17 13 43 17 38 40 -0.78 20 0 0 17 40 33 16 26 33.9 41 214 -4 17 32 25 17 48 42 17 28 4 17 53 4 -0.78 21 0 0 17 55 25 16 26 36.6 40 215 -5 17 47 16 18 3 34 17 42 54 18 7 57 -0.78 22 0 0 18 10 45 16 26 39.2 39 216 -6 18 2 35 18 18 56 17 58 13 18 23 19 -0.78 23 0 0 18 26 34 16 26 41.8 38 217 -7 18 18 23 18 34 46 18 14 0 18 39 9 -0.78 24 0 0 18 42 50 16 26 44.4 38 217 -8 18 34 38 18 51 3 18 30 15 18 55 28 -0.78 25 0 0 18 59 35 16 26 46.9 37 218 -9 18 51 22 19 7 49 18 46 58 19 12 14 -0.78 26 0 0 19 16 47 16 26 49.4 36 219 -10 19 8 33 19 25 2 19 4 9 19 29 28 -0.78 27 0 0 19 34 26 16 26 51.8 35 220 -11 19 26 11 19 42 43 19 21 46 19 47 9 -0.78 28 0 0 19 52 32 16 26 54.2 34 220 -12 19 44 16 20 0 50 19 39 50 20 5 17 -0.78 29 0 0 20 11 5 16 26 56.6 33 221 -13 20 2 47 20 19 24 19 58 21 20 23 51 -0.78 30 0 0 20 30 3 16 26 58.8 33 222 -14 20 21 44 20 38 23 20 17 18 20 42 51 -0.78 31 0 0 20 49 27 16 27 1.1 32 222 -15 20 41 7 20 57 48 20 36 40 21 2 17 -0.78 32 0 0 21 9 16 16 27 3.2 31 223 -16 21 0 55 21 17 38 20 56 27 21 22 8 -0.78 33 0 0 21 29 30 16 27 5.4 30 224 -17 21 21 7 21 37 54 21 16 39 21 42 24 -0.78 34 0 0 21 50 8 16 27 7.4 29 224 -18 21 41 44 21 58 33 21 37 15 22 3 4 -0.78 35 0 0 22 11 10 16 27 9.4 28 225 -19 22 2 45 22 19 36 21 58 14 22 24 7 -0.78 36 0 0 22 32 35 16 27 11.4 27 226 -20 22 24 8 22 41 2 22 19 38 22 45 34 -0.78 37 0 0 22 54 23 16 27 13.2 26 226 -21 22 45 55 23 2 51 22 41 24 23 7 24 -0.78 38 0 0 23 16 33 16 27 15.1 25 227 -22 23 8 4 23 25 3 23 3 32 23 29 36 -0.78 39 0 0 23 39 4 16 27 16.8 24 227 -23 23 30 34 23 47 36 23 26 1 23 52 10 -0.78 40 0 0 24 1 57 16 27 18.5 23 228 -24 23 53 25 24 10 30 23 48 52 24 15 5 -0.78 41 0 0 24 25 10 16 27 20.2 22 228 -25 24 16 38 24 33 45 24 12 3 24 38 20 -0.78 42 0 0 24 48 44 16 27 21.7 22 229 -26 24 40 9 24 57 19 24 35 35 25 1 55 -0.78 43 0 0 25 12 36 16 27 23.2 21 229 -27 25 4 1 25 21 13 24 59 25 25 25 50 -0.78 44 0 0 25 36 48 16 27 24.7 20 230 -28 25 28 11 25 45 26 25 23 34 25 50 3 -0.78 45 0 0 26 1 17 16 27 26.0 19 231 -29 25 52 38 26 9 56 25 48 1 26 14 35 -0.78 46 0 0 26 26 3 16 27 27.3 18 231 -30 26 17 24 26 34 44 26 12 46 26 39 23 -0.78 47 0 0 26 51 6 16 27 28.6 17 232 -30 26 42 26 26 59 48 26 37 47 27 4 28 -0.78 48 0 0 27 16 25 16 27 29.7 16 232 -31 27 7 43 27 25 9 27 3 4 27 29 49 -0.78 49 0 0 27 42 0 16 27 30.8 15 233 -32 27 33 16 27 50 44 27 28 37 27 55 25 -0.78 50 0 0 28 7 48 16 27 31.8 14 233 -33 27 59 4 28 16 34 27 54 23 28 21 16 -0.78 51 0 0 28 33 51 16 27 32.8 13 234 -34 28 25 5 28 42 38 28 20 24 28 47 20 -0.79 52 0 0 29 0 5 16 27 33.7 12 234 -35 28 51 18 29 8 54 28 46 37 29 13 37 -0.79 53 0 0 29 26 33 16 27 34.5 11 235 -36 29 17 44 29 35 22 29 13 2 29 40 6 -0.79 54 0 0 29 53 11 16 27 35.2 10 235 -36 29 44 22 30 2 2 29 39 39 30 6 46 -0.79 55 0 0 30 20 0 16 27 35.9 9 236 -37 30 11 9 30 28 52 30 6 26 30 33 37 -0.79 56 0 0 30 46 59 16 27 36.5 8 236 -38 30 38 7 30 55 52 30 33 23 31 0 38 -0.79 57 0 0 31 14 7 16 27 37.1 7 237 -39 31 5 14 31 23 1 31 0 29 31 27 47 -0.80 58 0 0 31 41 23 16 27 37.5 6 237 -40 31 32 29 31 50 18 31 27 43 31 55 5 -0.80 59 0 0 32 8 45 16 27 37.9 5 238 -40 31 59 50 32 17 42 31 55 4 32 22 29 -0.80 60 0 0 32 36 15 16 27 38.2 4 238 -41 32 27 19 32 45 12 32 22 32 32 50 0 -0.81 61 0 0 33 3 50 16 27 38.5 3 239 -42 32 54 53 33 12 48 32 50 6 33 17 37 -0.82 62 0 0 33 31 29 16 27 38.7 2 239 -43 33 22 31 33 40 29 33 17 44 33 45 18 -0.84 63 0 0 33 59 13 16 27 38.8 1 240 -43 33 50 14 34 8 13 33 45 26 34 13 3 -0.89 64 0 0 34 26 59 16 27 38.9 0 241 -44 34 17 59 34 36 0 34 13 11 34 40 50 -1.17 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 332-138540 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 16 15.7727 DE: -23 44 03.526 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 16 15.7727 DE: -23 44 03.526 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.300) * V mag [mag]: 11.1 * B mag [mag]: 13.0 * Diameter [mas]: 0.50 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3502) Huangpu asteroid class: approx. diameter [km]: 22 approx. diameter ["]: 0.010 distance from Earth [AU]: 2.97620 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#53 date of fit: 2023 Apr 24 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): 0.021", 0.003", 91.86° remarks: * orbital elements for (3502)Huangpu : Mean anomaly = 343.8447217112 deg Arg. of pericenter = 211.0162563181 deg Long. of node = 104.8738142472 deg Inclination = 2.8193856170 deg Eccentricity = 0.1710873093 Semimajor axis = 3.1357934064 AU Perihelion dist = 2.5992989500 AU Mag: H = 11.96, G = 0.15 Epoch of elements : MJD 60609.68412771 TDT (2024 Oct 26.6841) ------ occelmnt file for Occult BEGIN ----------------------------------- <Occultations> <Event> <Elements>JPL#532023Apr24,0.69,2024,10,26,16.419071,-0.004068,0.613100,18.914493,0.106669,0.005036,0.000136,-0.000001,0.000000</Elements> <Earth>-7.3805,-23.7268,-70.31,-12.77,False</Earth> <Star>UCAC4 332-138540,18.27104802,-23.7343126,12.99,11.09,10.06,0.5,0,,18.29602859,-23.7267892,6.30,6.88,0,0,0</Star> <Object>3502,Huangpu,17.39,22.980,2.9762,0,0,4.070,0.32,,1.8,0</Object> <Orbit>0,343.7233,2024,10,26,211.0163,104.8738,2.8194,0.17109,3.13579,2.59930,11.95,5.0,0.15</Orbit> <Errors>1.268,0.0210,0.0027,92,0.0028,Known errors,0.69,0,-1,-1</Errors> <ID>20241026_138540,60140.66</ID> </Event> </Occultations> ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org