IOTA/IOTA-ES occultation update for (2930) Euripides / UCAC4 303-153358 event on 2024 Jul 11, 18:56 UT Visible from Summary ------- On 2024 Jul 11 UT, the 17.5496652059299 km diameter asteroid (2930) Euripides will occult a 10.1 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 7.29 mag to 17.35 mag (the magnitude of the asteroid) for at most 1.790 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 Jul 11, 18:47 - 2024 Jul 11, 19:05 * geocentric midpoint of event [JD]: 2460503.28930005 * magnitude of target star: 10.06 * magnitude drop [mag]: 7.29 * estimated maximum duration [s]: 1.790 * Moon: 30 % sunlit, 93° distance * Sun: 158° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.002", 92°) * approx speed of asteroid's shadow [km/s]: 10.0501 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 303-153358 by 2930 Euripides on 2024 Jul 11 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 - 14 0 0 34 57 24 19 5 16.0 0 127 12 35 4 56 34 49 53 35 7 34 34 47 16 .... - 13 0 0 34 20 6 19 5 15.8 1 128 11 34 27 36 34 12 36 34 30 13 34 9 59 -0.30 - 12 0 0 33 42 45 19 5 15.3 2 128 10 33 50 15 33 35 17 33 52 52 33 32 41 -0.48 - 11 0 0 33 5 25 19 5 14.6 4 129 9 33 12 54 32 57 58 33 15 30 32 55 22 -0.55 - 10 0 0 32 28 6 19 5 13.6 5 129 8 32 35 34 32 20 40 32 38 10 32 18 5 -0.59 - 9 0 0 31 50 50 19 5 12.4 6 130 7 31 58 16 31 43 25 32 0 52 31 40 50 -0.61 - 8 0 0 31 13 39 19 5 10.9 7 131 6 31 21 3 31 6 15 31 23 38 31 3 41 -0.63 - 7 0 0 30 36 33 19 5 9.2 8 131 5 30 43 56 30 29 10 30 46 31 30 26 37 -0.64 - 6 0 0 29 59 34 19 5 7.2 9 132 4 30 6 56 29 52 13 30 9 30 29 49 40 -0.65 - 5 0 0 29 22 44 19 5 4.9 10 132 3 29 30 4 29 15 24 29 32 38 29 12 52 -0.66 - 4 0 0 28 46 3 19 5 2.4 11 133 1 28 53 22 28 38 45 28 55 55 28 36 13 -0.67 - 3 0 0 28 9 34 19 4 59.6 12 133 0 28 16 51 28 2 17 28 19 23 27 59 46 -0.67 - 2 0 0 27 33 16 19 4 56.5 13 134 -1 27 40 32 27 26 2 27 43 4 27 23 31 -0.68 - 1 0 0 26 57 13 19 4 53.2 14 134 -2 27 4 27 26 50 0 27 6 58 26 47 29 -0.68 0 0 0 26 21 24 19 4 49.6 15 135 -3 26 28 36 26 14 12 26 31 7 26 11 42 -0.68 1 0 0 25 45 51 19 4 45.8 16 135 -4 25 53 1 25 38 41 25 55 31 25 36 11 -0.69 2 0 0 25 10 34 19 4 41.7 17 136 -5 25 17 43 25 3 26 25 20 12 25 0 57 -0.69 3 0 0 24 35 36 19 4 37.4 18 136 -6 24 42 43 24 28 30 24 45 12 24 26 2 -0.69 4 0 0 24 0 57 19 4 32.8 19 136 -7 24 8 2 23 53 53 24 10 31 23 51 25 -0.69 5 0 0 23 26 38 19 4 28.0 20 137 -8 23 33 42 23 19 36 23 36 9 23 17 9 -0.69 6 0 0 22 52 41 19 4 22.9 21 137 -9 22 59 42 22 45 40 23 2 9 22 43 13 -0.69 7 0 0 22 19 5 19 4 17.6 22 138 -10 22 26 5 22 12 6 22 28 31 22 9 40 -0.69 8 0 0 21 45 53 19 4 12.1 23 138 -11 21 52 51 21 38 55 21 55 16 21 36 30 -0.70 9 0 0 21 13 4 19 4 6.4 24 139 -12 21 20 0 21 6 8 21 22 25 21 3 44 -0.70 10 0 0 20 40 40 19 4 0.4 25 139 -13 20 47 34 20 33 46 20 49 59 20 31 22 -0.70 11 0 0 20 8 41 19 3 54.2 26 140 -14 20 15 33 20 1 49 20 17 57 19 59 25 -0.70 12 0 0 19 37 8 19 3 47.8 27 140 -15 19 43 59 19 30 18 19 46 22 19 27 55 -0.70 13 0 0 19 6 2 19 3 41.2 28 141 -16 19 12 51 18 59 13 19 15 14 18 56 51 -0.70 14 0 0 18 35 23 19 3 34.4 29 142 -18 18 42 11 18 28 37 18 44 33 18 26 15 -0.70 15 0 0 18 5 13 19 3 27.4 30 142 -19 18 11 58 17 58 28 18 14 20 17 56 7 -0.70 16 0 0 17 35 31 19 3 20.2 31 143 -20 17 42 15 17 28 48 17 44 36 17 26 27 -0.70 17 0 0 17 6 18 19 3 12.8 32 143 -21 17 13 0 16 59 37 17 15 20 16 57 17 -0.70 18 0 0 16 37 35 19 3 5.3 33 144 -22 16 44 16 16 30 55 16 46 35 16 28 36 -0.70 19 0 0 16 9 22 19 2 57.6 34 144 -23 16 16 1 16 2 44 16 18 20 16 0 25 -0.70 20 0 0 15 41 40 19 2 49.7 35 145 -24 15 48 17 15 35 3 15 50 35 15 32 45 -0.70 21 0 0 15 14 28 19 2 41.6 36 146 -25 15 21 4 15 7 53 15 23 22 15 5 36 -0.70 22 0 0 14 47 48 19 2 33.4 37 146 -26 14 54 22 14 41 15 14 56 40 14 38 58 -0.70 23 0 0 14 21 40 19 2 25.0 38 147 -27 14 28 13 14 15 9 14 30 29 14 12 52 -0.70 24 0 0 13 56 4 19 2 16.5 38 148 -28 14 2 35 13 49 34 14 4 51 13 47 18 -0.70 25 0 0 13 31 1 19 2 7.8 39 148 -29 13 37 30 13 24 32 13 39 46 13 22 17 -0.70 26 0 0 13 6 30 19 1 59.1 40 149 -30 13 12 58 13 0 3 13 15 13 12 57 48 -0.70 27 0 0 12 42 32 19 1 50.1 41 150 -31 12 48 59 12 36 7 12 51 13 12 33 52 -0.70 28 0 0 12 19 8 19 1 41.1 42 150 -32 12 25 33 12 12 43 12 27 47 12 10 30 -0.70 29 0 0 11 56 17 19 1 31.9 42 151 -33 12 2 40 11 49 54 12 4 54 11 47 41 -0.70 30 0 0 11 33 59 19 1 22.7 43 152 -34 11 40 21 11 27 38 11 42 34 11 25 25 -0.70 31 0 0 11 12 16 19 1 13.3 44 153 -35 11 18 36 11 5 55 11 20 49 11 3 43 -0.70 32 0 0 10 51 6 19 1 3.8 45 154 -36 10 57 25 10 44 47 10 59 38 10 42 35 -0.70 33 0 0 10 30 31 19 0 54.2 45 155 -37 10 36 49 10 24 13 10 39 0 10 22 2 -0.70 34 0 0 10 10 29 19 0 44.5 46 155 -38 10 16 46 10 4 13 10 18 58 10 2 2 -0.70 35 0 0 9 51 3 19 0 34.8 47 156 -39 9 57 18 9 44 47 9 59 29 9 42 37 -0.70 36 0 0 9 32 10 19 0 24.9 48 157 -39 9 38 25 9 25 56 9 40 35 9 23 46 -0.70 37 0 0 9 13 53 19 0 15.0 48 158 -40 9 20 6 9 7 40 9 22 16 9 5 30 -0.70 38 0 0 8 56 10 19 0 5.0 49 159 -41 9 2 22 8 49 58 9 4 32 8 47 49 -0.70 39 0 0 8 39 2 18 59 54.9 49 160 -42 8 45 13 8 32 51 8 47 23 8 30 42 -0.70 40 0 0 8 22 29 18 59 44.8 50 162 -43 8 28 39 8 16 19 8 30 48 8 14 11 -0.70 41 0 0 8 6 31 18 59 34.6 50 163 -44 8 12 40 8 0 22 8 14 49 7 58 14 -0.70 42 0 0 7 51 8 18 59 24.3 51 164 -45 7 57 16 7 45 0 7 59 24 7 42 52 -0.70 43 0 0 7 36 20 18 59 14.0 51 165 -46 7 42 27 7 30 13 7 44 35 7 28 5 -0.70 44 0 0 7 22 7 18 59 3.7 52 166 -47 7 28 13 7 16 1 7 30 21 7 13 53 -0.70 45 0 0 7 8 29 18 58 53.3 52 167 -47 7 14 34 7 2 24 7 16 42 7 0 17 -0.70 46 0 0 6 55 26 18 58 42.9 53 169 -48 7 1 31 6 49 22 7 3 38 6 47 15 -0.70 47 0 0 6 42 58 18 58 32.4 53 170 -49 6 49 2 6 36 55 6 51 9 6 34 48 -0.70 48 0 0 6 31 6 18 58 21.9 54 171 -50 6 37 9 6 25 3 6 39 16 6 22 57 -0.69 49 0 0 6 19 49 18 58 11.4 54 173 -51 6 25 51 6 13 46 6 27 57 6 11 41 -0.69 50 0 0 6 9 6 18 58 0.8 54 174 -51 6 15 8 6 3 5 6 17 14 6 0 59 -0.69 51 0 0 5 59 0 18 57 50.3 54 175 -52 6 5 1 5 52 59 6 7 7 5 50 53 -0.69 52 0 0 5 49 28 18 57 39.7 55 177 -53 5 55 29 5 43 28 5 57 34 5 41 22 -0.69 53 0 0 5 40 31 18 57 29.1 55 178 -54 5 46 31 5 34 32 5 48 37 5 32 27 -0.69 54 0 0 5 32 10 18 57 18.5 55 180 -54 5 38 10 5 26 11 5 40 15 5 24 6 -0.69 55 0 0 5 24 24 18 57 7.9 55 181 -55 5 30 23 5 18 25 5 32 28 5 16 21 -0.69 56 0 0 5 17 13 18 56 57.3 55 183 -56 5 23 12 5 11 15 5 25 17 5 9 10 -0.69 57 0 0 5 10 38 18 56 46.7 55 184 -56 5 16 36 5 4 40 5 18 41 5 2 35 -0.69 58 0 0 5 4 37 18 56 36.1 55 186 -57 5 10 35 4 58 40 5 12 40 4 56 36 -0.69 59 0 0 4 59 12 18 56 25.5 55 187 -58 5 5 10 4 53 15 5 7 14 4 51 11 -0.69 60 0 0 4 54 22 18 56 14.9 55 188 -58 5 0 20 4 48 26 5 2 24 4 46 21 -0.69 61 0 0 4 50 8 18 56 4.4 55 190 -59 4 56 5 4 44 11 4 58 9 4 42 7 -0.69 62 0 0 4 46 29 18 55 53.8 55 191 -59 4 52 25 4 40 32 4 54 30 4 38 28 -0.69 63 0 0 4 43 25 18 55 43.3 55 193 -60 4 49 21 4 37 28 4 51 25 4 35 25 -0.69 64 0 0 4 40 56 18 55 32.8 55 194 -60 4 46 52 4 35 0 4 48 56 4 32 56 -0.70 65 0 0 4 39 2 18 55 22.3 54 196 -61 4 44 59 4 33 7 4 47 3 4 31 3 -0.70 66 0 0 4 37 44 18 55 11.9 54 197 -61 4 43 41 4 31 48 4 45 45 4 29 45 -0.70 67 0 0 4 37 2 18 55 1.5 54 198 -61 4 42 58 4 31 6 4 45 2 4 29 2 -0.70 68 0 0 4 36 54 18 54 51.1 54 200 -62 4 42 50 4 30 58 4 44 54 4 28 54 -0.70 69 0 0 4 37 22 18 54 40.8 53 201 -62 4 43 18 4 31 26 4 45 22 4 29 22 -0.70 70 0 0 4 38 25 18 54 30.5 53 202 -62 4 44 22 4 32 29 4 46 26 4 30 25 -0.70 71 0 0 4 40 4 18 54 20.3 52 203 -63 4 46 0 4 34 8 4 48 5 4 32 4 -0.70 72 0 0 4 42 18 18 54 10.1 52 204 -63 4 48 15 4 36 22 4 50 19 4 34 18 -0.70 73 0 0 4 45 7 18 53 59.9 52 206 -63 4 51 4 4 39 11 4 53 9 4 37 7 -0.70 74 0 0 4 48 32 18 53 49.9 51 207 -63 4 54 29 4 42 36 4 56 34 4 40 32 -0.70 75 0 0 4 52 33 18 53 39.8 51 208 -63 4 58 30 4 46 36 5 0 35 4 44 32 -0.70 76 0 0 4 57 9 18 53 29.9 50 209 -63 5 3 6 4 51 12 5 5 11 4 49 7 -0.70 77 0 0 5 2 20 18 53 20.0 50 210 -63 5 8 18 4 56 23 5 10 23 4 54 18 -0.70 78 0 0 5 8 7 18 53 10.2 49 211 -63 5 14 6 5 2 9 5 16 11 5 0 5 -0.70 79 0 0 5 14 30 18 53 0.4 48 212 -63 5 20 29 5 8 32 5 22 34 5 6 27 -0.70 80 0 0 5 21 29 18 52 50.8 48 213 -63 5 27 28 5 15 30 5 29 33 5 13 25 -0.70 81 0 0 5 29 3 18 52 41.2 47 214 -62 5 35 2 5 23 3 5 37 8 5 20 58 -0.70 82 0 0 5 37 12 18 52 31.7 47 215 -62 5 43 13 5 31 12 5 45 18 5 29 7 -0.70 83 0 0 5 45 58 18 52 22.3 46 215 -62 5 51 59 5 39 57 5 54 5 5 37 52 -0.70 84 0 0 5 55 19 18 52 13.0 45 216 -62 6 1 21 5 49 18 6 3 27 5 47 12 -0.70 85 0 0 6 5 16 18 52 3.7 44 217 -61 6 11 18 5 59 14 6 13 25 5 57 8 -0.70 86 0 0 6 15 49 18 51 54.6 44 218 -61 6 21 52 6 9 47 6 23 58 6 7 40 -0.70 87 0 0 6 26 58 18 51 45.6 43 218 -60 6 33 1 6 20 55 6 35 8 6 18 48 -0.70 88 0 0 6 38 42 18 51 36.7 42 219 -60 6 44 47 6 32 38 6 46 54 6 30 32 -0.70 89 0 0 6 51 3 18 51 27.9 42 220 -59 6 57 8 6 44 58 6 59 16 6 42 51 -0.71 90 0 0 7 4 0 18 51 19.2 41 220 -59 7 10 6 6 57 54 7 12 13 6 55 47 -0.71 91 0 0 7 17 32 18 51 10.6 40 221 -58 7 23 39 7 11 26 7 25 47 7 9 18 -0.71 92 0 0 7 31 41 18 51 2.1 39 222 -58 7 37 49 7 25 33 7 39 57 7 23 25 -0.71 93 0 0 7 46 25 18 50 53.8 38 222 -57 7 52 34 7 40 17 7 54 43 7 38 9 -0.71 94 0 0 8 1 46 18 50 45.6 37 223 -57 8 7 56 7 55 36 8 10 4 7 53 28 -0.71 95 0 0 8 17 42 18 50 37.5 37 223 -56 8 23 53 8 11 32 8 26 2 8 9 23 -0.71 96 0 0 8 34 14 18 50 29.6 36 224 -55 8 40 26 8 28 3 8 42 36 8 25 54 -0.71 97 0 0 8 51 23 18 50 21.8 35 224 -54 8 57 36 8 45 10 8 59 46 8 43 0 -0.71 98 0 0 9 9 7 18 50 14.2 34 225 -54 9 15 21 9 2 53 9 17 32 9 0 43 -0.71 99 0 0 9 27 27 18 50 6.7 33 225 -53 9 33 42 9 21 12 9 35 53 9 19 1 -0.71 100 0 0 9 46 23 18 49 59.4 32 226 -52 9 52 40 9 40 7 9 54 51 9 37 56 -0.71 101 0 0 10 5 54 18 49 52.2 31 226 -51 10 12 12 9 59 37 10 14 24 9 57 26 -0.71 102 0 0 10 26 2 18 49 45.2 30 226 -51 10 32 21 10 19 43 10 34 33 10 17 31 -0.71 103 0 0 10 46 45 18 49 38.4 29 227 -50 10 53 5 10 40 24 10 55 18 10 38 12 -0.72 104 0 0 11 8 3 18 49 31.7 29 227 -49 11 14 25 11 1 41 11 16 38 10 59 29 -0.72 105 0 0 11 29 56 18 49 25.2 28 228 -48 11 36 20 11 23 34 11 38 33 11 21 20 -0.72 106 0 0 11 52 25 18 49 19.0 27 228 -47 11 58 50 11 46 1 12 1 4 11 43 47 -0.72 107 0 0 12 15 29 18 49 12.9 26 228 -46 12 21 55 12 9 3 12 24 10 12 6 49 -0.72 108 0 0 12 39 8 18 49 6.9 25 229 -45 12 45 35 12 32 40 12 47 51 12 30 26 -0.72 109 0 0 13 3 21 18 49 1.2 24 229 -44 13 9 50 12 56 52 13 12 6 12 54 37 -0.72 110 0 0 13 28 9 18 48 55.7 23 229 -43 13 34 40 13 21 38 13 36 56 13 19 22 -0.72 111 0 0 13 53 30 18 48 50.4 22 230 -43 14 0 3 13 46 58 14 2 20 13 44 42 -0.72 112 0 0 14 19 26 18 48 45.4 21 230 -42 14 26 0 14 12 53 14 28 18 14 10 36 -0.72 113 0 0 14 45 55 18 48 40.5 20 231 -41 14 52 31 14 39 20 14 54 49 14 37 3 -0.73 114 0 0 15 12 58 18 48 35.8 19 231 -40 15 19 36 15 6 21 15 21 54 15 4 3 -0.73 115 0 0 15 40 33 18 48 31.4 18 231 -39 15 47 13 15 33 55 15 49 32 15 31 36 -0.73 116 0 0 16 8 41 18 48 27.2 17 232 -38 16 15 22 16 2 1 16 17 42 15 59 42 -0.73 117 0 0 16 37 21 18 48 23.3 16 232 -37 16 44 4 16 30 39 16 46 24 16 28 19 -0.73 118 0 0 17 6 33 18 48 19.6 15 232 -36 17 13 17 16 59 49 17 15 38 16 57 29 -0.73 119 0 0 17 36 16 18 48 16.1 14 233 -35 17 43 2 17 29 30 17 45 24 17 27 9 -0.73 120 0 0 18 6 29 18 48 12.9 12 233 -34 18 13 17 17 59 41 18 15 39 17 57 20 -0.73 121 0 0 18 37 12 18 48 9.9 11 233 -33 18 44 2 18 30 23 18 46 25 18 28 0 -0.74 122 0 0 19 8 25 18 48 7.2 10 234 -32 19 15 17 19 1 34 19 17 40 18 59 11 -0.74 123 0 0 19 40 6 18 48 4.8 9 234 -31 19 47 0 19 33 14 19 49 24 19 30 50 -0.74 124 0 0 20 12 16 18 48 2.6 8 234 -29 20 19 11 20 5 21 20 21 36 20 2 57 -0.74 125 0 0 20 44 53 18 48 0.6 7 235 -28 20 51 50 20 37 56 20 54 16 20 35 31 -0.75 126 0 0 21 17 56 18 47 59.0 6 235 -27 21 24 55 21 10 58 21 27 21 21 8 32 -0.75 127 0 0 21 51 25 18 47 57.6 5 235 -26 21 58 26 21 44 25 22 0 53 21 41 59 -0.76 128 0 0 22 25 19 18 47 56.5 4 236 -25 22 32 22 22 18 17 22 34 50 22 15 50 -0.77 129 0 0 22 59 37 18 47 55.6 3 236 -24 23 6 42 22 52 33 23 9 10 22 50 5 -0.79 130 0 0 23 34 18 18 47 55.0 2 237 -23 23 41 24 23 27 12 23 43 53 23 24 44 -0.82 131 0 0 24 9 20 18 47 54.7 1 237 -22 24 16 29 24 2 13 24 18 58 23 59 44 -0.98 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 303-153358 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 53 08.7079 DE: -29 33 03.815 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 53 08.7079 DE: -29 33 03.815 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 10.1 * B mag [mag]: 11.5 * Diameter [mas]: 0.30 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2930) Euripides asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.013 distance from Earth [AU]: 1.87670 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#51 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): 0.017", 0.002", 91.838° remarks: * orbital elements for (2930)Euripides : Mean anomaly = 172.6804000448 deg Arg. of pericenter = 103.7517060401 deg Long. of node = 359.1348791625 deg Inclination = 4.0597794602 deg Eccentricity = 0.0234695885 Semimajor axis = 2.7803754185 AU Perihelion dist = 2.7151211514 AU Mag: H = 13.17, G = 0.15 Epoch of elements : MJD 60502.78930034 TDT (2024 Jul 11.7893) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr24,1.79,2024,7,11,18.943201,0.064162,0.566738,-5.636555,0.638315,0.002039,0.000535,0.000001,0.000000 54.3608,-29.5573,-102.73,21.96,False UCAC4 303-153358,17.88575221,-29.5510597,11.50,10.06,9.28,0.3,0,,17.91221095,-29.5573314,7.29,7.61,0,0,0 2930,Euripides,17.35,17.958,1.8767,0,0,-2.024,2.99,,3.0,0 0,172.5126,2024,7,11,103.7517,359.1349,4.0598,0.02347,2.78038,2.71512,13.16,5.0,0.15 1.174,0.0167,0.0019,92,0.0023,Known errors,0.62,0,-1,-1 20240711_153358,60140.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org