IOTA/IOTA-ES occultation update for (28199) 1998 XA42 / TYC 6278-01364-1 event on 2024 Apr 02, 10:27 UT Visible from Summary ------- On 2024 Apr 02 UT, the 9.86397796676439 km diameter asteroid (28199) 1998 XA42 will occult a 9.0 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 9.65 mag to 18.67 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: 87 * date and approx. time of event: 2024 Apr 02, 10:21 - 2024 Apr 02, 10:33 * geocentric midpoint of event [JD]: 2460402.93578620 * magnitude of target star: 9.02 * magnitude drop [mag]: 9.65 * estimated maximum duration [s]: 0.690 * Moon: 47 % sunlit, 12° distance * Sun: 96° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 0.57 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.003", 97°) * approx speed of asteroid's shadow [km/s]: 14.4536 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6278-01364-1 by 28199 1998 XA42 on 2024 Apr 2 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 -141 0 0 37 42 18 10 21 56.0 1 118 -45 37 38 20 37 46 17 37 33 49 37 50 49 .... -140 0 0 37 17 36 10 21 56.2 2 118 -45 37 13 38 37 21 35 37 9 7 37 26 6 -0.46 -139 0 0 36 52 55 10 21 56.5 2 119 -46 36 48 57 36 56 53 36 44 27 37 1 24 -0.60 -138 0 0 36 28 15 10 21 56.9 3 120 -46 36 24 17 36 32 13 36 19 47 36 36 43 -0.66 -137 0 0 36 3 37 10 21 57.5 4 120 -46 35 59 40 36 7 35 35 55 11 36 12 5 -0.70 -136 0 0 35 39 3 10 21 58.2 5 121 -46 35 35 6 35 43 0 35 30 37 35 47 30 -0.72 -135 0 0 35 14 32 10 21 59.1 6 121 -46 35 10 36 35 18 29 35 6 7 35 22 58 -0.74 -134 0 0 34 50 6 10 22 0.2 7 122 -46 34 46 10 34 54 3 34 41 42 34 58 32 -0.75 -133 0 0 34 25 45 10 22 1.4 8 123 -46 34 21 49 34 29 41 34 17 22 34 34 10 -0.76 -132 0 0 34 1 30 10 22 2.7 9 123 -45 33 57 35 34 5 26 33 53 8 34 9 54 -0.77 -131 0 0 33 37 22 10 22 4.2 10 124 -45 33 33 27 33 41 17 33 29 0 33 45 45 -0.77 -130 0 0 33 13 21 10 22 5.8 11 124 -45 33 9 27 33 17 16 33 5 0 33 21 43 -0.78 -129 0 0 32 49 29 10 22 7.6 12 125 -45 32 45 35 32 53 23 32 41 9 32 57 50 -0.78 -128 0 0 32 25 45 10 22 9.6 12 125 -45 32 21 51 32 29 39 32 17 26 32 34 5 -0.79 -127 0 0 32 2 11 10 22 11.7 13 126 -44 31 58 18 32 6 4 31 53 53 32 10 30 -0.79 -126 0 0 31 38 47 10 22 14.0 14 127 -44 31 34 54 31 42 40 31 30 30 31 47 5 -0.79 -125 0 0 31 15 34 10 22 16.4 15 127 -44 31 11 42 31 19 27 31 7 18 31 23 52 -0.80 -124 0 0 30 52 33 10 22 19.0 16 128 -44 30 48 41 30 56 25 30 44 18 31 0 49 -0.80 -123 0 0 30 29 44 10 22 21.7 17 128 -43 30 25 53 30 33 36 30 21 30 30 38 0 -0.80 -122 0 0 30 7 9 10 22 24.6 18 129 -43 30 3 18 30 11 0 29 58 55 30 15 23 -0.80 -121 0 0 29 44 46 10 22 27.6 19 130 -42 29 40 56 29 48 37 29 36 34 29 53 0 -0.81 -120 0 0 29 22 39 10 22 30.8 20 130 -42 29 18 49 29 26 29 29 14 27 29 30 51 -0.81 -119 0 0 29 0 46 10 22 34.2 21 131 -42 28 56 56 29 4 36 28 52 36 29 8 57 -0.81 -118 0 0 28 39 9 10 22 37.7 22 131 -41 28 35 20 28 42 58 28 31 0 28 47 19 -0.81 -117 0 0 28 17 48 10 22 41.3 23 132 -41 28 14 0 28 21 37 28 9 40 28 25 57 -0.81 -116 0 0 27 56 44 10 22 45.1 23 133 -40 27 52 56 28 0 33 27 48 37 28 4 52 -0.81 -115 0 0 27 35 58 10 22 49.0 24 133 -40 27 32 10 27 39 46 27 27 52 27 44 5 -0.81 -114 0 0 27 15 29 10 22 53.1 25 134 -39 27 11 42 27 19 17 27 7 24 27 23 35 -0.82 -113 0 0 26 55 19 10 22 57.3 26 135 -38 26 51 33 26 59 6 26 47 15 27 3 24 -0.82 -112 0 0 26 35 29 10 23 1.7 27 135 -38 26 31 43 26 39 15 26 27 26 26 43 33 -0.82 -111 0 0 26 15 58 10 23 6.2 28 136 -37 26 12 12 26 19 44 26 7 56 26 24 1 -0.82 -110 0 0 25 56 47 10 23 10.8 29 137 -37 25 53 2 26 0 33 25 48 46 26 4 49 -0.82 -109 0 0 25 37 57 10 23 15.5 30 137 -36 25 34 13 25 41 42 25 29 57 25 45 58 -0.82 -108 0 0 25 19 29 10 23 20.4 30 138 -35 25 15 44 25 23 13 25 11 30 25 27 29 -0.82 -107 0 0 25 1 22 10 23 25.5 31 139 -34 24 57 38 25 5 6 24 53 24 25 9 21 -0.82 -106 0 0 24 43 37 10 23 30.6 32 139 -34 24 39 54 24 47 20 24 35 40 24 51 35 -0.82 -105 0 0 24 26 15 10 23 35.9 33 140 -33 24 22 32 24 29 58 24 18 19 24 34 12 -0.83 -104 0 0 24 9 16 10 23 41.3 34 141 -32 24 5 34 24 12 59 24 1 21 24 17 12 -0.83 -103 0 0 23 52 41 10 23 46.8 35 142 -32 23 48 59 23 56 23 23 44 47 24 0 36 -0.83 -102 0 0 23 36 29 10 23 52.4 35 143 -31 23 32 48 23 40 11 23 28 36 23 44 24 -0.83 -101 0 0 23 20 42 10 23 58.2 36 143 -30 23 17 1 23 24 24 23 12 50 23 28 36 -0.83 -100 0 0 23 5 20 10 24 4.0 37 144 -29 23 1 39 23 9 1 22 57 29 23 13 13 -0.83 - 99 0 0 22 50 23 10 24 10.0 38 145 -28 22 46 43 22 54 4 22 42 33 22 58 15 -0.83 - 98 0 0 22 35 52 10 24 16.0 38 146 -28 22 32 12 22 39 32 22 28 2 22 43 42 -0.83 - 97 0 0 22 21 46 10 24 22.2 39 147 -27 22 18 6 22 25 26 22 13 57 22 29 36 -0.83 - 96 0 0 22 8 6 10 24 28.4 40 148 -26 22 4 27 22 11 46 22 0 18 22 15 55 -0.83 - 95 0 0 21 54 53 10 24 34.8 40 149 -25 21 51 14 21 58 32 21 47 6 22 2 41 -0.83 - 94 0 0 21 42 7 10 24 41.2 41 150 -24 21 38 28 21 45 45 21 34 20 21 49 54 -0.83 - 93 0 0 21 29 47 10 24 47.7 42 151 -23 21 26 9 21 33 26 21 22 1 21 37 34 -0.84 - 92 0 0 21 17 55 10 24 54.3 42 152 -23 21 14 17 21 21 33 21 10 10 21 25 41 -0.84 - 91 0 0 21 6 30 10 25 1.0 43 153 -22 21 2 53 21 10 8 20 58 46 21 14 16 -0.84 - 90 0 0 20 55 34 10 25 7.8 44 154 -21 20 51 57 20 59 11 20 47 50 21 3 18 -0.84 - 89 0 0 20 45 5 10 25 14.6 44 155 -20 20 41 28 20 48 42 20 37 22 20 52 49 -0.84 - 88 0 0 20 35 5 10 25 21.5 45 156 -19 20 31 28 20 38 41 20 27 22 20 42 48 -0.84 - 87 0 0 20 25 33 10 25 28.5 45 158 -18 20 21 56 20 29 9 20 17 51 20 33 15 -0.84 - 86 0 0 20 16 29 10 25 35.5 46 159 -17 20 12 54 20 20 6 20 8 48 20 24 12 -0.84 - 85 0 0 20 7 55 10 25 42.6 46 160 -16 20 4 19 20 11 31 20 0 14 20 15 37 -0.84 - 84 0 0 19 59 50 10 25 49.7 47 161 -15 19 56 14 20 3 25 19 52 10 20 7 31 -0.84 - 83 0 0 19 52 14 10 25 56.9 47 163 -14 19 48 38 19 55 49 19 44 34 19 59 54 -0.84 - 82 0 0 19 45 7 10 26 4.2 47 164 -13 19 41 32 19 48 42 19 37 28 19 52 47 -0.84 - 81 0 0 19 38 30 10 26 11.4 48 165 -13 19 34 55 19 42 5 19 30 51 19 46 9 -0.84 - 80 0 0 19 32 22 10 26 18.8 48 167 -12 19 28 47 19 35 57 19 24 43 19 40 1 -0.84 - 79 0 0 19 26 44 10 26 26.1 48 168 -11 19 23 9 19 30 19 19 19 6 19 34 23 -0.84 - 78 0 0 19 21 36 10 26 33.5 49 169 -10 19 18 2 19 25 10 19 13 58 19 29 15 -0.84 - 77 0 0 19 16 58 10 26 40.9 49 171 -9 19 13 24 19 20 32 19 9 20 19 24 36 -0.84 - 76 0 0 19 12 50 10 26 48.4 49 172 -8 19 9 16 19 16 24 19 5 12 19 20 28 -0.84 - 75 0 0 19 9 12 10 26 55.8 49 174 -7 19 5 38 19 12 46 19 1 35 19 16 50 -0.84 - 74 0 0 19 6 4 10 27 3.3 50 175 -6 19 2 30 19 9 38 18 58 27 19 13 41 -0.84 - 73 0 0 19 3 26 10 27 10.8 50 177 -5 18 59 52 19 7 0 18 55 49 19 11 4 -0.85 - 72 0 0 19 1 19 10 27 18.3 50 178 -4 18 57 45 19 4 53 18 53 42 19 8 56 -0.85 - 71 0 0 18 59 42 10 27 25.8 50 180 -3 18 56 8 19 3 16 18 52 5 19 7 19 -0.85 - 70 0 0 18 58 35 10 27 33.3 50 181 -2 18 55 1 19 2 9 18 50 59 19 6 12 -0.85 - 69 0 0 18 57 59 10 27 40.9 50 183 -1 18 54 25 19 1 33 18 50 23 19 5 36 -0.85 - 68 0 0 18 57 53 10 27 48.4 50 184 0 18 54 20 19 1 27 18 50 17 19 5 30 -0.85 - 67 0 0 18 58 18 10 27 55.9 50 186 1 18 54 44 19 1 52 18 50 41 19 5 55 -0.85 - 66 0 0 18 59 13 10 28 3.4 49 187 2 18 55 39 19 2 46 18 51 36 19 6 50 -0.85 - 65 0 0 19 0 37 10 28 10.8 49 188 3 18 57 4 19 4 11 18 53 1 19 8 15 -0.85 - 64 0 0 19 2 33 10 28 18.3 49 190 4 18 58 59 19 6 7 18 54 56 19 10 10 -0.85 - 63 0 0 19 4 59 10 28 25.7 49 191 5 19 1 25 19 8 33 18 57 22 19 12 36 -0.85 - 62 0 0 19 7 54 10 28 33.1 49 193 6 19 4 20 19 11 29 19 0 18 19 15 32 -0.85 - 61 0 0 19 11 20 10 28 40.5 48 194 7 19 7 46 19 14 54 19 3 43 19 18 58 -0.85 - 60 0 0 19 15 16 10 28 47.8 48 196 8 19 11 42 19 18 51 19 7 39 19 22 54 -0.85 - 59 0 0 19 19 42 10 28 55.1 48 197 9 19 16 8 19 23 17 19 12 5 19 27 21 -0.85 - 58 0 0 19 24 38 10 29 2.4 47 198 10 19 21 4 19 28 13 19 17 0 19 32 17 -0.85 - 57 0 0 19 30 4 10 29 9.6 47 200 11 19 26 30 19 33 39 19 22 26 19 37 43 -0.85 - 56 0 0 19 36 0 10 29 16.8 47 201 12 19 32 25 19 39 35 19 28 21 19 43 39 -0.85 - 55 0 0 19 42 25 10 29 23.9 46 202 13 19 38 50 19 46 0 19 34 46 19 50 5 -0.85 - 54 0 0 19 49 19 10 29 31.0 46 203 14 19 45 44 19 52 55 19 41 40 19 57 0 -0.85 - 53 0 0 19 56 43 10 29 38.0 45 204 14 19 53 8 20 0 19 19 49 4 20 4 24 -0.85 - 52 0 0 20 4 37 10 29 44.9 45 206 15 20 1 1 20 8 12 19 56 56 20 12 18 -0.85 - 51 0 0 20 12 59 10 29 51.8 44 207 16 20 9 23 20 16 35 20 5 18 20 20 41 -0.85 - 50 0 0 20 21 50 10 29 58.6 43 208 17 20 18 14 20 25 26 20 14 8 20 29 32 -0.85 - 49 0 0 20 31 9 10 30 5.4 43 209 18 20 27 33 20 34 46 20 23 27 20 38 52 -0.85 - 48 0 0 20 40 58 10 30 12.0 42 210 19 20 37 21 20 44 34 20 33 15 20 48 41 -0.85 - 47 0 0 20 51 14 10 30 18.6 42 211 20 20 47 37 20 54 51 20 43 31 20 58 58 -0.85 - 46 0 0 21 1 58 10 30 25.1 41 212 21 20 58 21 21 5 36 20 54 14 21 9 43 -0.85 - 45 0 0 21 13 11 10 30 31.5 40 213 22 21 9 33 21 16 48 21 5 26 21 20 56 -0.85 - 44 0 0 21 24 50 10 30 37.8 40 214 23 21 21 12 21 28 28 21 17 5 21 32 37 -0.85 - 43 0 0 21 36 57 10 30 44.0 39 215 24 21 33 19 21 40 36 21 29 11 21 44 44 -0.85 - 42 0 0 21 49 32 10 30 50.2 38 216 25 21 45 53 21 53 10 21 41 45 21 57 19 -0.85 - 41 0 0 22 2 33 10 30 56.2 37 217 26 21 58 54 22 6 12 21 54 45 22 10 21 -0.85 - 40 0 0 22 16 0 10 31 2.1 37 218 27 22 12 21 22 19 40 22 8 12 22 23 49 -0.85 - 39 0 0 22 29 54 10 31 7.9 36 218 28 22 26 14 22 33 33 22 22 4 22 37 44 -0.85 - 38 0 0 22 44 13 10 31 13.7 35 219 29 22 40 33 22 47 53 22 36 23 22 52 4 -0.85 - 37 0 0 22 58 58 10 31 19.3 34 220 30 22 55 17 23 2 39 22 51 7 23 6 50 -0.85 - 36 0 0 23 14 8 10 31 24.7 34 221 30 23 10 27 23 17 49 23 6 16 23 22 1 -0.84 - 35 0 0 23 29 43 10 31 30.1 33 222 31 23 26 1 23 33 24 23 21 50 23 37 36 -0.84 - 34 0 0 23 45 42 10 31 35.4 32 222 32 23 42 0 23 49 24 23 37 48 23 53 36 -0.84 - 33 0 0 24 2 5 10 31 40.5 31 223 33 23 58 23 24 5 48 23 54 11 24 10 1 -0.84 - 32 0 0 24 18 52 10 31 45.5 30 224 34 24 15 9 24 22 35 24 10 57 24 26 48 -0.84 - 31 0 0 24 36 2 10 31 50.4 29 224 35 24 32 19 24 39 45 24 28 6 24 43 59 -0.84 - 30 0 0 24 53 35 10 31 55.1 29 225 36 24 49 51 24 57 19 24 45 37 25 1 33 -0.84 - 29 0 0 25 11 30 10 31 59.7 28 226 37 25 7 46 25 15 14 25 3 32 25 19 29 -0.84 - 28 0 0 25 29 47 10 32 4.2 27 226 37 25 26 2 25 33 31 25 21 48 25 37 47 -0.84 - 27 0 0 25 48 25 10 32 8.5 26 227 38 25 44 40 25 52 10 25 40 25 25 56 26 -0.84 - 26 0 0 26 7 24 10 32 12.7 25 228 39 26 3 39 26 11 10 25 59 23 26 15 27 -0.84 - 25 0 0 26 26 44 10 32 16.8 24 228 40 26 22 58 26 30 30 26 18 42 26 34 47 -0.84 - 24 0 0 26 46 23 10 32 20.7 23 229 41 26 42 37 26 50 10 26 38 20 26 54 28 -0.84 - 23 0 0 27 6 22 10 32 24.4 22 229 41 27 2 35 27 10 9 26 58 18 27 14 27 -0.84 - 22 0 0 27 26 39 10 32 28.0 21 230 42 27 22 52 27 30 27 27 18 34 27 34 46 -0.84 - 21 0 0 27 47 15 10 32 31.5 21 231 43 27 43 27 27 51 3 27 39 9 27 55 22 -0.84 - 20 0 0 28 8 8 10 32 34.8 20 231 43 28 4 20 28 11 57 28 0 1 28 16 17 -0.84 - 19 0 0 28 29 18 10 32 38.0 19 232 44 28 25 30 28 33 7 28 21 10 28 37 28 -0.85 - 18 0 0 28 50 45 10 32 41.0 18 232 45 28 46 56 28 54 35 28 42 36 28 58 56 -0.85 - 17 0 0 29 12 28 10 32 43.9 17 233 46 29 8 38 29 16 18 29 4 17 29 20 39 -0.85 - 16 0 0 29 34 26 10 32 46.6 16 234 46 29 30 35 29 38 16 29 26 14 29 42 38 -0.85 - 15 0 0 29 56 38 10 32 49.1 15 234 47 29 52 47 30 0 29 29 48 25 30 4 51 -0.85 - 14 0 0 30 19 4 10 32 51.5 14 235 47 30 15 13 30 22 55 30 10 51 30 27 19 -0.85 - 13 0 0 30 41 44 10 32 53.8 13 235 48 30 37 52 30 45 35 30 33 29 30 49 59 -0.85 - 12 0 0 31 4 36 10 32 55.8 12 236 49 31 0 44 31 8 28 30 56 20 31 12 52 -0.85 - 11 0 0 31 27 40 10 32 57.8 11 236 49 31 23 47 31 31 33 31 19 23 31 35 58 -0.85 - 10 0 0 31 50 55 10 32 59.5 10 237 50 31 47 2 31 54 48 31 42 38 31 59 14 -0.85 - 9 0 0 32 14 21 10 33 1.2 9 237 50 32 10 28 32 18 15 32 6 3 32 22 41 -0.85 - 8 0 0 32 37 57 10 33 2.6 8 238 50 32 34 3 32 41 51 32 29 38 32 46 17 -0.86 - 7 0 0 33 1 42 10 33 3.9 8 239 51 32 57 48 33 5 36 32 53 22 33 10 3 -0.86 - 6 0 0 33 25 35 10 33 5.1 7 239 51 33 21 41 33 29 30 33 17 14 33 33 58 -0.86 - 5 0 0 33 49 37 10 33 6.1 6 240 52 33 45 41 33 53 32 33 41 15 33 58 0 -0.87 - 4 0 0 34 13 45 10 33 6.9 5 240 52 34 9 49 34 17 40 34 5 22 34 22 9 -0.87 - 3 0 0 34 37 59 10 33 7.6 4 241 52 34 34 3 34 41 55 34 29 36 34 46 24 -0.88 - 2 0 0 35 2 19 10 33 8.1 3 241 53 34 58 23 35 6 16 34 53 55 35 10 45 -0.89 - 1 0 0 35 26 44 10 33 8.5 2 242 53 35 22 48 35 30 41 35 18 19 35 35 11 -0.92 0 0 0 35 51 14 10 33 8.8 1 243 53 35 47 17 35 55 11 35 42 48 35 59 41 -0.99 1 0 0 36 15 46 10 33 8.9 0 243 53 36 11 49 36 19 44 36 7 20 36 24 14 -1.66 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 14.3 Data for the target star ------------------------ * name: TYC 6278-01364-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 28 07.5689 DE: -21 21 00.604 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 28 07.5692 DE: -21 21 00.604 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.500,0.300) * V mag [mag]: 9.0 * B mag [mag]: 9.3 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (28199) 1998 XA42 asteroid class: approx. diameter [km]: 10 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.17880 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#45 date of fit: 2023 Apr 25 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): 0.013", 0.003", 96.7° remarks: * orbital elements for (28199)1998 XA42 : Mean anomaly = 184.7986988362 deg Arg. of pericenter = 337.3397578882 deg Long. of node = 90.8867024292 deg Inclination = 5.4944668614 deg Eccentricity = 0.0033973292 Semimajor axis = 2.4862205423 AU Perihelion dist = 2.4777740325 AU Mag: H = 13.90, G = 0.15 Epoch of elements : MJD 60402.43578591 TDT (2024 Apr 02.4358) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#452023Apr25,0.69,2024,4,2,10.458869,0.009273,0.645172,8.156994,-0.129914,-0.005605,-0.000303,0.000000,0.000000 -70.7497,-21.3360,23.98,5.20,False TYC 6278-01364-1,18.46876910,-21.3501679,9.30,9.02,8.87,0.1,0,,18.49292097,-21.3359768,9.65,9.36,0,0,0 28199,1998 XA42,18.67,10.022,2.1788,0,0,2.357,-0.52,,1.0,0 0,184.6891,2024,4,2,337.3398,90.8867,5.4945,0.00340,2.48622,2.47777,13.89,5.0,0.15 1.568,0.0133,0.0033,97,0.0036,Known errors,1.96,0,-1,-1 20240402_1364-1,60139.27 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 06:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org