IOTA/IOTA-ES occultation update for (82) Alkmene / UCAC4 328-192742 event on 2023 Oct 20, 01:49 UT Visible from SE Canada, USA, Mexico Summary ------- On 2023 Oct 20 UT, the 59.6 km diameter asteroid (82) Alkmene will occult a 12.4 mag star in the constellation Sagittarius for observers along a path across SE Canada, USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.20 mag to 14.42 mag (the magnitude of the asteroid) for at most 3.470 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 Oct 20, 01:45 - 2023 Oct 20, 01:54 * geocentric midpoint of event [JD]: 2460237.57618850 * magnitude of target star: 12.37 * magnitude drop [mag]: 2.20 * estimated maximum duration [s]: 3.470 * Moon: 27 % sunlit, 22° distance * Sun: 85° distance * rough path description: SE Canada, USA, Mexico Additional comments ------------------- RUWE The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 0.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.003, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.003", 0.001", 80°) * approx speed of asteroid's shadow [km/s]: 17.1848 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 328-192742 by 82 Alkmene on 2023 Oct 20 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 0 0 0 .. .. .... .. .. .. .. .. .. 26 44 23 .. .. .. 26 42 56 .. .. .. .... 163 0 0 26 41 9 1 45 14.2 1 118 51 26 16 16 27 6 14 26 14 50 27 7 41 .... 164 0 0 26 13 25 1 45 14.4 2 119 51 25 48 39 26 38 23 25 47 13 26 39 50 -0.57 165 0 0 25 46 11 1 45 14.7 3 119 51 25 21 31 26 11 2 25 20 5 26 12 29 -0.70 166 0 0 25 19 27 1 45 15.2 4 119 51 24 54 53 25 44 11 24 53 28 25 45 38 -0.76 167 0 0 24 53 13 1 45 15.9 5 120 51 24 28 46 25 17 52 24 27 21 25 19 18 -0.80 168 0 0 24 27 32 1 45 16.7 6 120 51 24 3 10 24 52 4 24 1 46 24 53 30 -0.83 169 0 0 24 2 22 1 45 17.7 7 121 51 23 38 7 24 26 49 23 36 43 24 28 14 -0.84 170 0 0 23 37 46 1 45 18.9 8 121 51 23 13 36 24 2 6 23 12 12 24 3 31 -0.86 171 0 0 23 13 42 1 45 20.2 9 122 51 22 49 39 23 37 57 22 48 15 23 39 21 -0.87 172 0 0 22 50 13 1 45 21.6 10 122 51 22 26 15 23 14 21 22 24 52 23 15 46 -0.87 173 0 0 22 27 18 1 45 23.2 11 122 50 22 3 25 22 51 21 22 2 2 22 52 44 -0.88 174 0 0 22 4 57 1 45 25.0 12 123 50 21 41 10 22 28 55 21 39 47 22 30 18 -0.89 175 0 0 21 43 12 1 45 26.9 13 123 50 21 19 30 22 7 4 21 18 8 22 8 27 -0.89 176 0 0 21 22 2 1 45 28.9 14 124 49 20 58 25 21 45 49 20 57 3 21 47 12 -0.90 177 0 0 21 1 29 1 45 31.1 15 124 49 20 37 57 21 25 11 20 36 35 21 26 33 -0.90 178 0 0 20 41 32 1 45 33.5 16 124 49 20 18 4 21 5 9 20 16 43 21 6 31 -0.90 179 0 0 20 22 11 1 45 36.0 17 125 48 19 58 49 20 45 43 19 57 28 20 47 6 -0.91 -180 0 0 20 3 28 1 45 38.6 18 125 48 19 40 10 20 26 56 19 38 49 20 28 17 -0.91 -179 0 0 19 45 22 1 45 41.4 19 126 47 19 22 9 20 8 45 19 20 48 20 10 7 -0.91 -178 0 0 19 27 54 1 45 44.3 20 126 47 19 4 45 19 51 13 19 3 24 19 52 34 -0.92 -177 0 0 19 11 4 1 45 47.3 20 127 46 18 47 59 19 34 18 18 46 39 19 35 40 -0.92 -176 0 0 18 54 52 1 45 50.5 21 127 45 18 31 51 19 18 3 18 30 31 19 19 23 -0.92 -175 0 0 18 39 19 1 45 53.8 22 128 45 18 16 21 19 2 25 18 15 1 19 3 46 -0.92 -174 0 0 18 24 24 1 45 57.2 23 128 44 18 1 30 18 47 27 18 0 11 18 48 47 -0.92 -173 0 0 18 10 8 1 46 0.8 24 129 44 17 47 18 18 33 8 17 45 59 18 34 28 -0.92 -172 0 0 17 56 32 1 46 4.5 25 129 43 17 33 45 18 19 28 17 32 26 18 20 48 -0.93 -171 0 0 17 43 35 1 46 8.3 26 130 42 17 20 51 18 6 28 17 19 32 18 7 47 -0.93 -170 0 0 17 31 17 1 46 12.2 27 130 42 17 8 36 17 54 7 17 7 17 17 55 27 -0.93 -169 0 0 17 19 39 1 46 16.2 28 131 41 16 57 1 17 42 26 16 55 42 17 43 46 -0.93 -168 0 0 17 8 41 1 46 20.4 28 131 40 16 46 5 17 31 25 16 44 47 17 32 45 -0.93 -167 0 0 16 58 23 1 46 24.7 29 132 39 16 35 50 17 21 5 16 34 32 17 22 24 -0.93 -166 0 0 16 48 45 1 46 29.1 30 133 39 16 26 14 17 11 25 16 24 56 17 12 44 -0.93 -165 0 0 16 39 48 1 46 33.5 31 133 38 16 17 19 17 2 25 16 16 1 17 3 44 -0.94 -164 0 0 16 31 30 1 46 38.1 32 134 37 16 9 3 16 54 6 16 7 46 16 55 24 -0.94 -163 0 0 16 23 54 1 46 42.8 33 134 36 16 1 28 16 46 27 16 0 11 16 47 46 -0.94 -162 0 0 16 16 57 1 46 47.6 33 135 35 15 54 34 16 39 29 15 53 16 16 40 48 -0.94 -161 0 0 16 10 42 1 46 52.5 34 136 34 15 48 20 16 33 12 15 47 3 16 34 31 -0.94 -160 0 0 16 5 7 1 46 57.5 35 137 34 15 42 47 16 27 36 15 41 29 16 28 55 -0.94 -159 0 0 16 0 14 1 47 2.6 36 137 33 15 37 54 16 22 42 15 36 37 16 24 0 -0.94 -158 0 0 15 56 1 1 47 7.8 36 138 32 15 33 42 16 18 28 15 32 25 16 19 46 -0.94 -157 0 0 15 52 29 1 47 13.0 37 139 31 15 30 11 16 14 55 15 28 54 16 16 13 -0.94 -156 0 0 15 49 38 1 47 18.4 38 140 30 15 27 21 16 12 4 15 26 4 16 13 22 -0.94 -155 0 0 15 47 29 1 47 23.8 38 141 29 15 25 12 16 9 54 15 23 55 16 11 12 -0.94 -154 0 0 15 46 0 1 47 29.3 39 141 28 15 23 44 16 8 25 15 22 27 16 9 44 -0.95 -153 0 0 15 45 13 1 47 34.9 40 142 27 15 22 57 16 7 38 15 21 39 16 8 56 -0.95 -152 0 0 15 45 7 1 47 40.5 40 143 26 15 22 51 16 7 32 15 21 34 16 8 51 -0.95 -151 0 0 15 45 43 1 47 46.2 41 144 25 15 23 26 16 8 8 15 22 9 16 9 26 -0.95 -150 0 0 15 47 0 1 47 52.0 41 145 25 15 24 42 16 9 25 15 23 25 16 10 44 -0.95 -149 0 0 15 48 58 1 47 57.9 42 146 24 15 26 40 16 11 24 15 25 23 16 12 43 -0.95 -148 0 0 15 51 38 1 48 3.8 42 147 23 15 29 19 16 14 5 15 28 1 16 15 23 -0.95 -147 0 0 15 54 59 1 48 9.8 43 148 22 15 32 39 16 17 27 15 31 21 16 18 45 -0.95 -146 0 0 15 59 1 1 48 15.8 43 149 21 15 36 40 16 21 31 15 35 23 16 22 49 -0.95 -145 0 0 16 3 45 1 48 21.9 44 151 20 15 41 23 16 26 16 15 40 5 16 27 34 -0.95 -144 0 0 16 9 10 1 48 28.0 44 152 19 15 46 47 16 31 43 15 45 29 16 33 1 -0.95 -143 0 0 16 15 17 1 48 34.2 44 153 18 15 52 52 16 37 51 15 51 34 16 39 10 -0.95 -142 0 0 16 22 5 1 48 40.4 45 154 17 15 59 38 16 44 41 15 58 20 16 46 0 -0.95 -141 0 0 16 29 35 1 48 46.7 45 155 16 16 7 5 16 52 13 16 5 47 16 53 32 -0.95 -140 0 0 16 37 46 1 48 53.0 45 157 15 16 15 14 17 0 26 16 13 56 17 1 45 -0.95 -139 0 0 16 46 38 1 48 59.4 46 158 14 16 24 4 17 9 20 16 22 46 17 10 40 -0.95 -138 0 0 16 56 11 1 49 5.7 46 159 13 16 33 35 17 18 56 16 32 16 17 20 16 -0.95 -137 0 0 17 6 26 1 49 12.1 46 160 12 16 43 47 17 29 14 16 42 28 17 30 33 -0.95 -136 0 0 17 17 22 1 49 18.6 46 162 11 16 54 39 17 40 12 16 53 21 17 41 32 -0.95 -135 0 0 17 28 58 1 49 25.0 46 163 10 17 6 13 17 51 52 17 4 54 17 53 12 -0.95 -134 0 0 17 41 16 1 49 31.5 46 164 9 17 18 27 18 4 13 17 17 8 18 5 33 -0.95 -133 0 0 17 54 14 1 49 38.0 46 166 8 17 31 23 18 17 15 17 30 3 18 18 36 -0.95 -132 0 0 18 7 54 1 49 44.5 46 167 7 17 44 58 18 30 58 17 43 39 18 32 19 -0.95 -131 0 0 18 22 13 1 49 51.0 46 169 6 17 59 14 18 45 22 17 57 55 18 46 43 -0.95 -130 0 0 18 37 14 1 49 57.5 46 170 5 18 14 10 19 0 26 18 12 51 19 1 47 -0.95 -129 0 0 18 52 54 1 50 4.0 46 171 4 18 29 47 19 16 11 18 28 27 19 17 32 -0.95 -128 0 0 19 9 15 1 50 10.5 46 173 3 18 46 3 19 32 36 18 44 43 19 33 57 -0.95 -127 0 0 19 26 15 1 50 17.0 46 174 2 19 2 59 19 49 41 19 1 39 19 51 2 -0.95 -126 0 0 19 43 55 1 50 23.5 46 175 1 19 20 35 20 7 25 19 19 14 20 8 47 -0.95 -125 0 0 20 2 15 1 50 30.0 45 177 0 19 38 50 20 25 50 19 37 28 20 27 12 -0.95 -124 0 0 20 21 14 1 50 36.4 45 178 -1 19 57 43 20 44 53 19 56 22 20 46 16 -0.95 -123 0 0 20 40 51 1 50 42.8 45 179 -2 20 17 16 21 4 36 20 15 54 21 5 59 -0.95 -122 0 0 21 1 7 1 50 49.2 45 181 -3 20 37 27 21 24 58 20 36 5 21 26 21 -0.95 -121 0 0 21 22 2 1 50 55.6 44 182 -4 20 58 16 21 45 57 20 56 54 21 47 21 -0.95 -120 0 0 21 43 34 1 51 1.9 44 183 -5 21 19 43 22 7 35 21 18 20 22 8 59 -0.95 -119 0 0 22 5 44 1 51 8.2 43 185 -6 21 41 47 22 29 51 21 40 24 22 31 15 -0.95 -118 0 0 22 28 31 1 51 14.5 43 186 -7 22 4 28 22 52 44 22 3 5 22 54 8 -0.95 -117 0 0 22 51 54 1 51 20.7 42 187 -8 22 27 46 23 16 13 22 26 22 23 17 38 -0.95 -116 0 0 23 15 54 1 51 26.8 42 188 -9 22 51 40 23 40 19 22 50 16 23 41 45 -0.95 -115 0 0 23 40 30 1 51 32.9 41 189 -10 23 16 9 24 5 1 23 14 45 24 6 27 -0.95 -114 0 0 24 5 41 1 51 38.9 41 191 -11 23 41 14 24 30 19 23 39 49 24 31 45 -0.95 -113 0 0 24 31 26 1 51 44.9 40 192 -12 24 6 53 24 56 10 24 5 28 24 57 37 -0.95 -112 0 0 24 57 46 1 51 50.8 39 193 -13 24 33 6 25 22 37 24 31 40 25 24 3 -0.95 -111 0 0 25 24 38 1 51 56.6 39 194 -14 24 59 52 25 49 36 24 58 26 25 51 3 -0.95 -110 0 0 25 52 4 1 52 2.3 38 195 -15 25 27 11 26 17 9 25 25 45 26 18 36 -0.95 -109 0 0 26 20 2 1 52 8.0 37 196 -16 25 55 2 26 45 13 25 53 35 26 46 41 -0.95 -108 0 0 26 48 31 1 52 13.5 37 197 -17 26 23 24 27 13 49 26 21 57 27 15 18 -0.95 -107 0 0 27 17 30 1 52 19.0 36 198 -18 26 52 16 27 42 56 26 50 49 27 44 25 -0.95 -106 0 0 27 47 0 1 52 24.4 35 199 -19 27 21 39 28 12 33 27 20 11 28 14 2 -0.95 -105 0 0 28 16 58 1 52 29.7 35 200 -20 27 51 30 28 42 38 27 50 2 28 44 8 -0.95 -104 0 0 28 47 24 1 52 34.8 34 201 -21 28 21 49 29 13 12 28 20 21 29 14 42 -0.95 -103 0 0 29 18 17 1 52 39.9 33 202 -21 28 52 35 29 44 12 28 51 6 29 45 43 -0.95 -102 0 0 29 49 37 1 52 44.8 32 203 -22 29 23 48 30 15 39 29 22 18 30 17 10 -0.95 -101 0 0 30 21 22 1 52 49.7 31 204 -23 29 55 25 30 47 31 29 53 55 30 49 3 -0.95 -100 0 0 30 53 30 1 52 54.4 30 205 -24 30 27 26 31 19 48 30 25 56 31 21 19 -0.95 - 99 0 0 31 26 2 1 52 59.0 30 205 -25 30 59 51 31 52 27 30 58 20 31 53 59 -0.95 - 98 0 0 31 58 56 1 53 3.4 29 206 -26 31 32 37 32 25 28 31 31 6 32 27 1 -0.95 - 97 0 0 32 32 10 1 53 7.7 28 207 -27 32 5 44 32 58 50 32 4 13 33 0 23 -0.95 - 96 0 0 33 5 44 1 53 11.9 27 208 -27 32 39 11 33 32 31 32 37 39 33 34 5 -0.95 - 95 0 0 33 39 36 1 53 16.0 26 209 -28 33 12 56 34 6 31 33 11 24 34 8 5 -0.95 - 94 0 0 34 13 46 1 53 19.9 25 209 -29 33 46 58 34 40 48 33 45 26 34 42 22 -0.95 - 93 0 0 34 48 11 1 53 23.7 24 210 -30 34 21 17 35 15 20 34 19 43 35 16 55 -0.95 - 92 0 0 35 22 51 1 53 27.3 23 211 -30 34 55 49 35 50 7 34 54 16 35 51 42 -0.95 - 91 0 0 35 57 43 1 53 30.8 22 212 -31 35 30 35 36 25 7 35 29 1 36 26 43 -0.95 - 90 0 0 36 32 48 1 53 34.2 21 212 -32 36 5 33 37 0 19 36 3 59 37 1 55 -0.95 - 89 0 0 37 8 3 1 53 37.3 20 213 -32 36 40 41 37 35 40 36 39 7 37 37 17 -0.95 - 88 0 0 37 43 27 1 53 40.4 20 214 -33 37 15 59 38 11 11 37 14 24 38 12 48 -0.95 - 87 0 0 38 18 59 1 53 43.3 19 215 -34 37 51 24 38 46 50 37 49 49 38 48 27 -0.95 - 86 0 0 38 54 37 1 53 46.0 18 215 -34 38 26 56 39 22 34 38 25 20 39 24 12 -0.95 - 85 0 0 39 30 20 1 53 48.6 17 216 -35 39 2 33 39 58 23 39 0 57 40 0 1 -0.95 - 84 0 0 40 6 6 1 53 51.1 16 217 -35 39 38 13 40 34 15 39 36 36 40 35 54 -0.95 - 83 0 0 40 41 54 1 53 53.4 15 218 -36 40 13 55 41 10 9 40 12 18 41 11 48 -0.95 - 82 0 0 41 17 42 1 53 55.5 14 218 -36 40 49 37 41 46 3 40 48 0 41 47 42 -0.95 - 81 0 0 41 53 29 1 53 57.5 13 219 -37 41 25 19 42 21 55 41 23 42 42 23 35 -0.95 - 80 0 0 42 29 13 1 53 59.3 12 220 -37 42 0 58 42 57 45 41 59 21 42 59 25 -0.95 - 79 0 0 43 4 54 1 54 1.0 11 221 -38 42 36 34 43 33 30 42 34 56 43 35 10 -0.96 - 78 0 0 43 40 29 1 54 2.6 10 221 -38 43 12 5 44 9 10 43 10 26 44 10 50 -0.96 - 77 0 0 44 15 57 1 54 4.0 9 222 -39 43 47 28 44 44 42 43 45 50 44 46 23 -0.96 - 76 0 0 44 51 17 1 54 5.2 8 223 -39 44 22 44 45 20 6 44 21 6 45 21 47 -0.96 - 75 0 0 45 26 27 1 54 6.3 7 223 -39 44 57 51 45 55 20 44 56 12 45 57 1 -0.96 - 74 0 0 46 1 26 1 54 7.3 7 224 -40 45 32 47 46 30 23 45 31 8 46 32 4 -0.97 - 73 0 0 46 36 13 1 54 8.2 6 225 -40 46 7 31 47 5 13 46 5 51 47 6 55 -0.97 - 72 0 0 47 10 46 1 54 8.9 5 226 -40 46 42 1 47 39 49 46 40 22 47 41 31 -0.97 - 71 0 0 47 45 5 1 54 9.4 4 226 -40 47 16 17 48 14 10 47 14 38 48 15 52 -0.98 - 70 0 0 48 19 7 1 54 9.9 3 227 -41 47 50 18 48 48 15 47 48 38 48 49 57 -0.99 - 69 0 0 48 52 53 1 54 10.2 2 228 -41 48 24 1 49 22 2 48 22 22 49 23 44 -1.01 - 68 0 0 49 26 19 1 54 10.4 1 229 -41 48 57 27 49 55 30 48 55 47 49 57 12 -1.06 - 67 0 0 49 59 27 1 54 10.5 0 229 -41 49 30 33 50 28 39 49 28 53 50 30 21 -1.32 Uncertainty in time = +/- 0 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: UCAC4 328-192742 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 31 59.7362 DE: -24 35 54.435 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 31 59.7361 DE: -24 35 54.435 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (82) Alkmene asteroid class: approx. diameter [km]: 60 approx. diameter ["]: 0.025 distance from Earth [AU]: 3.30340 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#134 date of fit: 2023 Oct 09 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): 0.003", 0.001", 80.246° remarks: * orbital elements for (82)Alkmene : Mean anomaly = 167.2913729357 deg Arg. of pericenter = 110.9052086120 deg Long. of node = 25.4315995349 deg Inclination = 2.8262343098 deg Eccentricity = 0.2206916725 Semimajor axis = 2.7623270630 AU Perihelion dist = 2.1527044834 AU Mag: H = 8.29, G = 0.28 Epoch of elements : MJD 60237.07618055 TDT (2023 Oct 20.0762) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1342023Oct09,3.47,2023,10,20,1.828524,-0.164024,0.669496,9.420855,2.308537,0.005833,0.000907,0.000000,0.000000 -122.3444,-24.5492,148.80,-10.19,False UCAC4 328-192742,19.53326008,-24.5984542,0.00,12.37,0.00,0.0,0,,19.55712103,-24.5492134,2.21,0.00,0,0,0 82,Alkmene,14.42,59.600,3.3034,0,0,1.839,6.15,,3.2,0 0,167.0603,2023,10,19,110.9052,25.4316,2.8262,0.22069,2.76233,2.15270,8.29,5.0,0.15 1.029,0.0029,0.0007,80,0.0029,Known errors,-1.00,0,-1,-1 20231020_192742,60232.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 20:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org