IOTA/IOTA-ES occultation update for (168) Sibylla / UCAC4 376-069705 event on 2023 Apr 10, 07:22 UT Visible from USA, Canada Summary ------- On 2023 Apr 10 UT, the 145.7 km diameter asteroid (168) Sibylla will occult a 12.3 mag star in the constellation Libra for observers along a path across USA, Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.59 mag to 13.55 mag (the magnitude of the asteroid) for at most 12.110 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: 2023 Apr 10, 07:16 - 2023 Apr 10, 07:28 * geocentric midpoint of event [JD]: 2460044.80750284 * magnitude of target star: 12.25 * magnitude drop [mag]: 1.59 * estimated maximum duration [s]: 12.110 * Moon: 82 % sunlit, 26° distance * Sun: 156° distance * rough path description: USA, Canada The occultation path -------------------- * approximate projected width [km]: 226 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.008", 115°) * approx speed of asteroid's shadow [km/s]: 12.0363 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 376-069705 by 168 Sibylla on 2023 Apr 10 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 -138 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 67 38 13 .. .. .. 67 20 6 .... -137 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 67 17 0 .. .. .. 66 58 47 .... -136 0 0 68 19 29 7 28 27.9 0 134 -12 .. .. .. 66 55 14 .. .. .. 66 36 56 .... -135 0 0 67 57 35 7 28 27.8 1 135 -12 .. .. .. 66 32 55 .. .. .. 66 14 31 -0.38 -134 0 0 67 35 6 7 28 27.7 1 136 -13 69 3 51 66 10 2 .. .. .. 65 51 33 -0.75 -133 0 0 67 12 3 7 28 27.5 2 137 -13 68 41 14 65 46 35 69 1 38 65 28 1 -0.89 -132 0 0 66 48 24 7 28 27.3 2 138 -14 68 18 1 65 22 34 68 38 31 65 3 56 -0.96 -131 0 0 66 24 11 7 28 26.9 3 139 -14 67 54 11 64 57 59 68 14 47 64 39 17 -1.01 -130 0 0 65 59 21 7 28 26.5 3 140 -15 67 29 45 64 32 50 67 50 26 64 14 4 -1.04 -129 0 0 65 33 57 7 28 26.0 4 141 -16 67 4 41 64 7 7 67 25 28 63 48 17 -1.06 -128 0 0 65 7 56 7 28 25.3 5 142 -16 66 39 1 63 40 50 66 59 52 63 21 56 -1.08 -127 0 0 64 41 21 7 28 24.6 5 142 -17 66 12 43 63 13 59 66 33 38 62 55 2 -1.10 -126 0 0 64 14 11 7 28 23.7 6 143 -17 65 45 48 62 46 35 66 6 48 62 27 35 -1.11 -125 0 0 63 46 25 7 28 22.7 6 144 -18 65 18 17 62 18 37 65 39 20 61 59 35 -1.12 -124 0 0 63 18 6 7 28 21.7 7 145 -18 64 50 10 61 50 7 65 11 15 61 31 3 -1.12 -123 0 0 62 49 12 7 28 20.4 8 146 -19 64 21 26 61 21 5 64 42 34 61 1 59 -1.13 -122 0 0 62 19 45 7 28 19.1 8 147 -19 63 52 7 60 51 31 64 13 17 60 32 24 -1.14 -121 0 0 61 49 44 7 28 17.6 9 148 -20 63 22 12 60 21 25 63 43 24 60 2 17 -1.14 -120 0 0 61 19 12 7 28 16.0 10 149 -21 62 51 44 59 50 50 63 12 57 59 31 41 -1.15 -119 0 0 60 48 8 7 28 14.2 10 150 -21 62 20 42 59 19 44 62 41 55 59 0 35 -1.15 -118 0 0 60 16 34 7 28 12.3 11 151 -22 61 49 8 58 48 11 62 10 21 58 29 2 -1.15 -117 0 0 59 44 30 7 28 10.2 12 151 -22 61 17 1 58 16 9 61 38 14 57 57 0 -1.16 -116 0 0 59 11 57 7 28 7.9 13 152 -23 60 44 24 57 43 40 61 5 36 57 24 33 -1.16 -115 0 0 58 38 58 7 28 5.5 13 153 -24 60 11 18 57 10 47 60 32 28 56 51 40 -1.16 -114 0 0 58 5 32 7 28 3.0 14 154 -24 59 37 43 56 37 28 59 58 51 56 18 23 -1.17 -113 0 0 57 31 40 7 28 0.2 15 155 -25 59 3 42 56 3 46 59 24 47 55 44 43 -1.17 -112 0 0 56 57 26 7 27 57.3 16 156 -25 58 29 14 55 29 43 58 50 17 55 10 42 -1.17 -111 0 0 56 22 49 7 27 54.2 16 157 -26 57 54 23 54 55 19 58 15 22 54 36 21 -1.17 -110 0 0 55 47 51 7 27 50.9 17 158 -26 57 19 9 54 20 35 57 40 4 54 1 40 -1.17 -109 0 0 55 12 34 7 27 47.4 18 159 -27 56 43 34 53 45 34 57 4 25 53 26 43 -1.18 -108 0 0 54 37 0 7 27 43.7 19 160 -28 56 7 40 53 10 17 56 28 25 52 51 29 -1.18 -107 0 0 54 1 9 7 27 39.9 19 160 -28 55 31 27 52 34 45 55 52 8 52 16 1 -1.18 -106 0 0 53 25 3 7 27 35.8 20 161 -29 54 54 59 51 59 0 55 15 34 51 40 20 -1.18 -105 0 0 52 48 45 7 27 31.6 21 162 -29 54 18 17 51 23 3 54 38 46 51 4 27 -1.18 -104 0 0 52 12 16 7 27 27.2 22 163 -30 53 41 22 50 46 56 54 1 45 50 28 25 -1.18 -103 0 0 51 35 37 7 27 22.6 22 164 -30 53 4 16 50 10 41 53 24 33 49 52 15 -1.18 -102 0 0 50 58 50 7 27 17.8 23 165 -31 52 27 2 49 34 19 52 47 12 49 15 58 -1.18 -101 0 0 50 21 58 7 27 12.8 24 166 -31 51 49 40 48 57 51 52 9 43 48 39 36 -1.19 -100 0 0 49 45 0 7 27 7.6 25 167 -32 51 12 13 48 21 21 51 32 9 48 3 10 -1.19 - 99 0 0 49 8 0 7 27 2.3 25 168 -32 50 34 42 47 44 48 50 54 31 47 26 43 -1.19 - 98 0 0 48 31 0 7 26 56.7 26 169 -32 49 57 10 47 8 15 50 16 51 46 50 16 -1.19 - 97 0 0 47 53 59 7 26 51.0 27 170 -33 49 19 38 46 31 43 49 39 11 46 13 50 -1.19 - 96 0 0 47 17 1 7 26 45.1 28 171 -33 48 42 7 45 55 14 49 1 32 45 37 27 -1.19 - 95 0 0 46 40 7 7 26 39.0 28 172 -34 48 4 40 45 18 49 48 23 57 45 1 8 -1.19 - 94 0 0 46 3 18 7 26 32.8 29 173 -34 47 27 17 44 42 30 47 46 27 44 24 55 -1.19 - 93 0 0 45 26 36 7 26 26.4 30 174 -34 46 50 2 44 6 18 47 9 3 43 48 50 -1.19 - 92 0 0 44 50 3 7 26 19.8 30 175 -35 46 12 54 43 30 15 46 31 47 43 12 53 -1.19 - 91 0 0 44 13 39 7 26 13.1 31 176 -35 45 35 57 42 54 22 45 54 42 42 37 6 -1.19 - 90 0 0 43 37 27 7 26 6.2 32 177 -35 44 59 11 42 18 41 45 17 47 42 1 31 -1.19 - 89 0 0 43 1 28 7 25 59.2 32 178 -35 44 22 37 41 43 12 44 41 6 41 26 9 -1.19 - 88 0 0 42 25 43 7 25 52.0 33 179 -36 43 46 18 41 7 57 44 4 39 40 51 1 -1.19 - 87 0 0 41 50 13 7 25 44.7 33 181 -36 43 10 14 40 32 59 43 28 27 40 16 8 -1.19 - 86 0 0 41 15 1 7 25 37.3 34 182 -36 42 34 28 39 58 16 42 52 32 39 41 32 -1.19 - 85 0 0 40 40 6 7 25 29.8 35 183 -36 41 58 59 39 23 52 42 16 55 39 7 14 -1.19 - 84 0 0 40 5 30 7 25 22.1 35 184 -36 41 23 50 38 49 46 41 41 38 38 33 15 -1.19 - 83 0 0 39 31 15 7 25 14.3 36 185 -36 40 49 2 38 16 1 41 6 42 37 59 36 -1.19 - 82 0 0 38 57 21 7 25 6.5 36 186 -36 40 14 35 37 42 36 40 32 7 37 26 18 -1.19 - 81 0 0 38 23 49 7 24 58.5 36 188 -36 39 40 31 37 9 34 39 57 56 36 53 21 -1.19 - 80 0 0 37 50 41 7 24 50.4 37 189 -36 39 6 50 36 36 55 39 24 8 36 20 48 -1.19 - 79 0 0 37 17 57 7 24 42.3 37 190 -36 38 33 35 36 4 40 38 50 45 35 48 39 -1.19 - 78 0 0 36 45 39 7 24 34.1 38 191 -36 38 0 46 35 32 50 38 17 48 35 16 55 -1.19 - 77 0 0 36 13 47 7 24 25.8 38 193 -36 37 28 23 35 1 25 37 45 18 34 45 37 -1.19 - 76 0 0 35 42 21 7 24 17.4 38 194 -36 36 56 28 34 30 28 37 13 16 34 14 45 -1.19 - 75 0 0 35 11 24 7 24 9.0 39 195 -35 36 25 1 33 59 57 36 41 42 33 44 20 -1.19 - 74 0 0 34 40 56 7 24 0.5 39 196 -35 35 54 3 33 29 55 36 10 38 33 14 24 -1.19 - 73 0 0 34 10 56 7 23 52.0 39 198 -35 35 23 35 33 0 22 35 40 3 32 44 56 -1.19 - 72 0 0 33 41 27 7 23 43.5 39 199 -35 34 53 38 32 31 18 35 9 59 32 15 57 -1.19 - 71 0 0 33 12 28 7 23 34.9 40 200 -34 34 24 12 32 2 44 34 40 26 31 47 28 -1.19 - 70 0 0 32 44 0 7 23 26.3 40 202 -34 33 55 17 31 34 40 34 11 26 31 19 30 -1.19 - 69 0 0 32 16 4 7 23 17.7 40 203 -34 33 26 55 31 7 8 33 42 58 30 52 3 -1.19 - 68 0 0 31 48 40 7 23 9.1 40 204 -33 32 59 6 30 40 8 33 15 3 30 25 8 -1.19 - 67 0 0 31 21 50 7 23 0.4 40 205 -33 32 31 51 30 13 40 32 47 41 29 58 45 -1.19 - 66 0 0 30 55 32 7 22 51.8 40 207 -33 32 5 9 29 47 45 32 20 54 29 32 55 -1.19 - 65 0 0 30 29 49 7 22 43.2 40 208 -32 31 39 2 29 22 24 31 54 41 29 7 38 -1.19 - 64 0 0 30 4 39 7 22 34.5 40 209 -32 31 13 30 28 57 36 31 29 4 28 42 54 -1.19 - 63 0 0 29 40 5 7 22 25.9 40 210 -31 30 48 33 28 33 22 31 4 2 28 18 45 -1.19 - 62 0 0 29 16 5 7 22 17.4 40 212 -31 30 24 12 28 9 42 30 39 35 27 55 9 -1.19 - 61 0 0 28 52 41 7 22 8.8 40 213 -30 30 0 27 27 46 38 30 15 45 27 32 9 -1.19 - 60 0 0 28 29 53 7 22 0.3 40 214 -30 29 37 18 27 24 8 29 52 32 27 9 44 -1.19 - 59 0 0 28 7 41 7 21 51.9 39 215 -29 29 14 46 27 2 14 29 29 55 26 47 54 -1.19 - 58 0 0 27 46 5 7 21 43.4 39 217 -28 28 52 51 26 40 56 29 7 56 26 26 39 -1.19 - 57 0 0 27 25 6 7 21 35.1 39 218 -28 28 31 33 26 20 14 28 46 34 26 6 1 -1.19 - 56 0 0 27 4 44 7 21 26.7 39 219 -27 28 10 53 26 0 9 28 25 50 25 45 59 -1.19 - 55 0 0 26 44 59 7 21 18.5 38 220 -27 27 50 51 25 40 39 28 5 44 25 26 33 -1.19 - 54 0 0 26 25 51 7 21 10.3 38 221 -26 27 31 27 25 21 47 27 46 16 25 7 44 -1.19 - 53 0 0 26 7 21 7 21 2.2 38 222 -25 27 12 41 25 3 32 27 27 26 24 49 32 -1.19 - 52 0 0 25 49 29 7 20 54.1 37 223 -25 26 54 34 24 45 54 27 9 15 24 31 58 -1.19 - 51 0 0 25 32 15 7 20 46.2 37 224 -24 26 37 5 24 28 54 26 51 43 24 15 0 -1.19 - 50 0 0 25 15 40 7 20 38.3 37 225 -23 26 20 15 24 12 32 26 34 50 23 58 40 -1.19 - 49 0 0 24 59 42 7 20 30.5 36 226 -22 26 4 5 23 56 47 26 18 36 23 42 58 -1.19 - 48 0 0 24 44 24 7 20 22.8 36 227 -22 25 48 33 23 41 40 26 3 2 23 27 54 -1.19 - 47 0 0 24 29 44 7 20 15.2 35 228 -21 25 33 41 23 27 12 25 48 7 23 13 28 -1.19 - 46 0 0 24 15 43 7 20 7.7 35 229 -20 25 19 29 23 13 22 25 33 52 22 59 40 -1.19 - 45 0 0 24 2 21 7 20 0.3 34 230 -19 25 5 56 23 0 10 25 20 16 22 46 31 -1.19 - 44 0 0 23 49 38 7 19 53.0 34 231 -19 24 53 3 22 47 37 25 7 21 22 34 0 -1.19 - 43 0 0 23 37 35 7 19 45.8 33 232 -18 24 40 50 22 35 43 24 55 6 22 22 8 -1.19 - 42 0 0 23 26 12 7 19 38.7 32 233 -17 24 29 17 22 24 28 24 43 31 22 10 55 -1.19 - 41 0 0 23 15 27 7 19 31.8 32 234 -16 24 18 24 22 13 52 24 32 36 22 0 20 -1.19 - 40 0 0 23 5 23 7 19 25.0 31 234 -15 24 8 12 22 3 55 24 22 22 21 50 25 -1.19 - 39 0 0 22 55 58 7 19 18.3 31 235 -15 23 58 40 21 54 37 24 12 48 21 41 9 -1.19 - 38 0 0 22 47 14 7 19 11.7 30 236 -14 23 49 49 21 45 59 24 3 55 21 32 32 -1.19 - 37 0 0 22 39 9 7 19 5.3 29 237 -13 23 41 38 21 38 0 23 55 43 21 24 34 -1.19 - 36 0 0 22 31 45 7 18 59.0 29 237 -12 23 34 8 21 30 40 23 48 12 21 17 16 -1.20 - 35 0 0 22 25 0 7 18 52.8 28 238 -11 23 27 19 21 24 1 23 41 21 21 10 37 -1.20 - 34 0 0 22 18 56 7 18 46.8 27 239 -10 23 21 10 21 18 1 23 35 12 21 4 38 -1.20 - 33 0 0 22 13 33 7 18 40.9 26 239 -10 23 15 43 21 12 41 23 29 44 20 59 19 -1.20 - 32 0 0 22 8 50 7 18 35.2 26 240 -9 23 10 57 21 8 1 23 24 57 20 54 39 -1.20 - 31 0 0 22 4 48 7 18 29.7 25 240 -8 23 6 52 21 4 1 23 20 52 20 50 40 -1.20 - 30 0 0 22 1 26 7 18 24.2 24 241 -7 23 3 29 21 0 41 23 17 28 20 47 20 -1.20 - 29 0 0 21 58 45 7 18 19.0 23 242 -6 23 0 47 20 58 1 23 14 46 20 44 41 -1.20 - 28 0 0 21 56 46 7 18 13.9 23 242 -5 22 58 46 20 56 2 23 12 45 20 42 42 -1.20 - 27 0 0 21 55 27 7 18 9.0 22 243 -4 22 57 28 20 54 44 23 11 26 20 41 23 -1.21 - 26 0 0 21 54 49 7 18 4.2 21 243 -3 22 56 50 20 54 5 23 10 49 20 40 45 -1.21 - 25 0 0 21 54 52 7 17 59.6 20 244 -2 22 56 55 20 54 8 23 10 54 20 40 47 -1.21 - 24 0 0 21 55 37 7 17 55.2 19 244 -2 22 57 41 20 54 51 23 11 41 20 41 30 -1.21 - 23 0 0 21 57 3 7 17 50.9 19 245 -1 22 59 10 20 56 15 23 13 10 20 42 54 -1.21 - 22 0 0 21 59 11 7 17 46.9 18 245 0 23 1 20 20 58 20 23 15 21 20 44 58 -1.21 - 21 0 0 22 2 0 7 17 43.0 17 246 1 23 4 13 21 1 6 23 18 15 20 47 43 -1.22 - 20 0 0 22 5 31 7 17 39.3 16 246 2 23 7 48 21 4 32 23 21 51 20 51 9 -1.22 - 19 0 0 22 9 43 7 17 35.8 15 247 3 23 12 5 21 8 40 23 26 9 20 55 16 -1.22 - 18 0 0 22 14 38 7 17 32.4 14 247 4 23 17 5 21 13 29 23 31 10 21 0 4 -1.22 - 17 0 0 22 20 13 7 17 29.3 13 248 5 23 22 47 21 19 0 23 36 53 21 5 33 -1.23 - 16 0 0 22 26 31 7 17 26.3 12 248 6 23 29 12 21 25 11 23 43 20 21 11 43 -1.23 - 15 0 0 22 33 32 7 17 23.6 12 248 7 23 36 19 21 32 5 23 50 29 21 18 35 -1.23 - 14 0 0 22 41 14 7 17 21.0 11 249 8 23 44 10 21 39 39 23 58 21 21 26 8 -1.24 - 13 0 0 22 49 38 7 17 18.7 10 249 9 23 52 43 21 47 56 24 6 56 21 34 23 -1.24 - 12 0 0 22 58 45 7 17 16.5 9 250 9 24 1 59 21 56 54 24 16 14 21 43 19 -1.25 - 11 0 0 23 8 34 7 17 14.6 8 250 10 24 11 58 22 6 33 24 26 16 21 52 57 -1.25 - 10 0 0 23 19 6 7 17 12.8 7 250 11 24 22 40 22 16 55 24 37 0 22 3 16 -1.26 - 9 0 0 23 30 19 7 17 11.3 6 251 12 24 34 5 22 27 58 24 48 28 22 14 17 -1.27 - 8 0 0 23 42 16 7 17 10.0 5 251 13 24 46 13 22 39 44 25 0 39 22 26 0 -1.28 - 7 0 0 23 54 55 7 17 8.9 4 252 14 24 59 5 22 52 11 25 13 34 22 38 24 -1.30 - 6 0 0 24 8 16 7 17 8.0 3 252 15 25 12 40 23 5 20 25 27 11 22 51 31 -1.33 - 5 0 0 24 22 20 7 17 7.3 2 252 16 25 26 57 23 19 10 25 41 32 23 5 19 -1.38 - 4 0 0 24 37 7 7 17 6.9 1 253 17 25 41 59 23 33 43 25 56 37 23 19 49 -1.49 - 3 0 0 24 52 36 7 17 6.7 1 253 18 25 57 43 23 48 58 26 12 25 23 35 0 -2.03 Uncertainty in time = +/- 3 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 376-069705 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 47 27.0491 DE: -14 48 59.902 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 47 27.0491 DE: -14 48 59.902 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (168) Sibylla asteroid class: approx. diameter [km]: 146 approx. diameter ["]: 0.075 distance from Earth [AU]: 2.67940 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#65 date of fit: 2023 Feb 07 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", 0.008", 114.864° remarks: * orbital elements for (168)Sibylla : Mean anomaly = 198.0036443901 deg Arg. of pericenter = 175.9876421706 deg Long. of node = 205.9214264399 deg Inclination = 4.6704806661 deg Eccentricity = 0.0747281188 Semimajor axis = 3.3753549582 AU Perihelion dist = 3.1231210318 AU Mag: H = 8.10, G = 0.15 Epoch of elements : MJD 60044.30756945 TDT (2023 Apr 10.3076) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#652023Feb07,12.11,2023,4,10,7.380068,0.311017,0.697579,-6.204722,2.766721,-0.002340,0.000601,0.000001,0.000000 -86.7862,-14.9150,69.66,7.88,False UCAC4 376-069705,14.79084697,-14.8166393,0.00,12.25,0.00,0.0,0,,14.81237467,-14.9150431,1.58,0.00,0,0,0 168,Sibylla,13.55,145.7,2.6794,0,0,-1.405,9.08,,7.2,0 0,197.9548,2023,4,10,175.9876,205.9214,4.6705,0.07473,3.37535,3.12312,8.12,5.0,0.15 1.111,0.0170,0.0083,115,0.0083,Known errors,-1.00,-1,-1,-1 20230410_069705,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org