IOTA/IOTA-ES occultation update for (168) Sibylla / UCAC4 359-170519 event on 2024 Oct 13, 01:36 UT Visible from Summary ------- On 2024 Oct 13 UT, the 145.806 km diameter asteroid (168) Sibylla will occult a 11.5 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 2.81 mag to 14.20 mag (the magnitude of the asteroid) for at most 7.260 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: 2024 Oct 13, 01:32 - 2024 Oct 13, 01:39 * geocentric midpoint of event [JD]: 2460596.56683904 * magnitude of target star: 11.48 * magnitude drop [mag]: 2.81 * estimated maximum duration [s]: 7.260 * Moon: 73 % sunlit, 37° distance * Sun: 82° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 251 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 2.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.003", 83°) * approx speed of asteroid's shadow [km/s]: 20.0861 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 359-170519 by 168 Sibylla on 2024 Oct 13 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 171 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 50 40 38 .. .. .. .... 172 0 0 51 46 12 1 33 11.9 0 120 28 50 28 53 .. .. .. 50 19 0 .. .. .. .... 173 0 0 51 24 24 1 33 11.9 1 121 28 50 7 16 52 44 29 49 57 25 52 55 9 -0.42 174 0 0 51 2 39 1 33 12.1 1 122 29 49 45 41 52 22 32 49 35 51 52 33 10 -0.90 175 0 0 50 40 57 1 33 12.3 2 123 29 49 24 9 52 0 37 49 14 21 52 11 14 -1.06 176 0 0 50 19 17 1 33 12.6 3 123 29 49 2 41 51 38 45 48 52 54 51 49 20 -1.15 177 0 0 49 57 42 1 33 13.0 4 124 29 48 41 17 51 16 58 48 31 32 51 27 31 -1.20 178 0 0 49 36 12 1 33 13.5 4 125 29 48 19 58 50 55 15 48 10 14 51 5 46 -1.23 179 0 0 49 14 47 1 33 14.1 5 126 29 47 58 45 50 33 36 47 49 2 50 44 6 -1.26 -180 0 0 48 53 28 1 33 14.8 6 126 29 47 37 38 50 12 4 47 27 57 50 22 32 -1.27 -179 0 0 48 32 16 1 33 15.5 7 127 29 47 16 39 49 50 39 47 6 59 50 1 5 -1.29 -178 0 0 48 11 12 1 33 16.4 7 128 29 46 55 47 49 29 21 46 46 8 49 39 45 -1.30 -177 0 0 47 50 16 1 33 17.4 8 129 28 46 35 3 49 8 11 46 25 26 49 18 33 -1.31 -176 0 0 47 29 29 1 33 18.5 9 129 28 46 14 28 48 47 10 46 4 53 48 57 30 -1.32 -175 0 0 47 8 51 1 33 19.6 10 130 28 45 54 3 48 26 19 45 44 30 48 36 37 -1.33 -174 0 0 46 48 24 1 33 20.9 10 131 28 45 33 49 48 5 38 45 24 17 48 15 54 -1.33 -173 0 0 46 28 8 1 33 22.3 11 132 28 45 13 46 47 45 8 45 4 15 47 55 22 -1.34 -172 0 0 46 8 4 1 33 23.7 12 133 28 44 53 54 47 24 50 44 44 25 47 35 2 -1.34 -171 0 0 45 48 12 1 33 25.3 13 133 28 44 34 14 47 4 44 44 24 47 47 14 54 -1.35 -170 0 0 45 28 33 1 33 27.0 13 134 27 44 14 48 46 44 51 44 5 22 46 54 59 -1.35 -169 0 0 45 9 8 1 33 28.7 14 135 27 43 55 35 46 25 11 43 46 11 46 35 18 -1.35 -168 0 0 44 49 56 1 33 30.6 15 136 27 43 36 36 46 5 46 43 27 13 46 15 51 -1.36 -167 0 0 44 31 0 1 33 32.6 16 136 27 43 17 52 45 46 36 43 8 31 45 56 39 -1.36 -166 0 0 44 12 19 1 33 34.6 16 137 26 42 59 24 45 27 41 42 50 4 45 37 42 -1.36 -165 0 0 43 53 54 1 33 36.8 17 138 26 42 41 11 45 9 2 42 31 53 45 19 1 -1.36 -164 0 0 43 35 45 1 33 39.0 18 139 26 42 23 15 44 50 40 42 13 58 45 0 37 -1.37 -163 0 0 43 17 54 1 33 41.4 18 140 25 42 5 35 44 32 36 41 56 20 44 42 31 -1.37 -162 0 0 43 0 20 1 33 43.8 19 140 25 41 48 13 44 14 49 41 39 0 44 24 42 -1.37 -161 0 0 42 43 5 1 33 46.3 20 141 24 41 31 10 43 57 20 41 21 57 44 7 12 -1.37 -160 0 0 42 26 8 1 33 48.9 20 142 24 41 14 25 43 40 10 41 5 14 43 50 0 -1.37 -159 0 0 42 9 30 1 33 51.7 21 143 24 40 57 58 43 23 20 40 48 49 43 33 8 -1.38 -158 0 0 41 53 12 1 33 54.5 22 144 23 40 41 52 43 6 50 40 32 44 43 16 36 -1.38 -157 0 0 41 37 15 1 33 57.3 22 145 23 40 26 5 42 50 40 40 16 59 43 0 24 -1.38 -156 0 0 41 21 38 1 34 0.3 23 146 22 40 10 39 42 34 51 40 1 34 42 44 34 -1.38 -155 0 0 41 6 22 1 34 3.4 24 146 22 39 55 34 42 19 23 39 46 30 42 29 4 -1.38 -154 0 0 40 51 27 1 34 6.5 24 147 21 39 40 50 42 4 17 39 31 48 42 13 57 -1.38 -153 0 0 40 36 55 1 34 9.7 25 148 21 39 26 28 41 49 33 39 17 27 41 59 11 -1.39 -152 0 0 40 22 45 1 34 13.0 26 149 20 39 12 28 41 35 12 39 3 28 41 44 49 -1.39 -151 0 0 40 8 58 1 34 16.4 26 150 20 38 58 51 41 21 14 38 49 52 41 30 49 -1.39 -150 0 0 39 55 34 1 34 19.9 27 151 19 38 45 37 41 7 40 38 36 39 41 17 13 -1.39 -149 0 0 39 42 33 1 34 23.4 27 152 18 38 32 45 40 54 29 38 23 49 41 4 1 -1.39 -148 0 0 39 29 56 1 34 27.0 28 153 18 38 20 18 40 41 42 38 11 22 40 51 13 -1.39 -147 0 0 39 17 44 1 34 30.7 28 154 17 38 8 14 40 29 20 37 59 20 40 38 50 -1.39 -146 0 0 39 5 56 1 34 34.4 29 155 17 37 56 35 40 17 23 37 47 42 40 26 51 -1.39 -145 0 0 38 54 33 1 34 38.2 29 156 16 37 45 20 40 5 51 37 36 28 40 15 18 -1.40 -144 0 0 38 43 35 1 34 42.0 30 157 15 37 34 30 39 54 44 37 25 39 40 4 10 -1.40 -143 0 0 38 33 3 1 34 46.0 30 158 15 37 24 6 39 44 4 37 15 15 39 53 29 -1.40 -142 0 0 38 22 56 1 34 49.9 31 159 14 37 14 6 39 33 49 37 5 17 39 43 13 -1.40 -141 0 0 38 13 16 1 34 54.0 31 160 13 37 4 33 39 24 1 36 55 44 39 33 23 -1.40 -140 0 0 38 4 1 1 34 58.0 32 161 13 36 55 25 39 14 39 36 46 37 39 24 0 -1.40 -139 0 0 37 55 13 1 35 2.2 32 162 12 36 46 44 39 5 44 36 37 57 39 15 4 -1.40 -138 0 0 37 46 52 1 35 6.3 32 163 11 36 38 28 38 57 16 36 29 42 39 6 36 -1.40 -137 0 0 37 38 58 1 35 10.5 33 164 10 36 30 40 38 49 15 36 21 54 38 58 34 -1.40 -136 0 0 37 31 30 1 35 14.8 33 165 10 36 23 18 38 41 42 36 14 33 38 51 0 -1.40 -135 0 0 37 24 30 1 35 19.1 33 166 9 36 16 23 38 34 36 36 7 39 38 43 53 -1.40 -134 0 0 37 17 58 1 35 23.4 34 168 8 36 9 55 38 27 58 36 1 12 38 37 15 -1.41 -133 0 0 37 11 53 1 35 27.8 34 169 8 36 3 55 38 21 48 35 55 12 38 31 4 -1.41 -132 0 0 37 6 15 1 35 32.2 34 170 7 35 58 22 38 16 7 35 49 39 38 25 22 -1.41 -131 0 0 37 1 6 1 35 36.6 34 171 6 35 53 16 38 10 53 35 44 34 38 20 8 -1.41 -130 0 0 36 56 25 1 35 41.1 35 172 5 35 48 38 38 6 8 35 39 57 38 15 22 -1.41 -129 0 0 36 52 11 1 35 45.5 35 173 4 35 44 28 38 1 51 35 35 47 38 11 5 -1.41 -128 0 0 36 48 26 1 35 50.0 35 175 4 35 40 46 37 58 3 35 32 5 38 7 16 -1.41 -127 0 0 36 45 10 1 35 54.5 35 176 3 35 37 32 37 54 44 35 28 51 38 3 57 -1.41 -126 0 0 36 42 21 1 35 59.0 35 177 2 35 34 45 37 51 53 35 26 5 38 1 6 -1.41 -125 0 0 36 40 1 1 36 3.6 35 178 1 35 32 27 37 49 31 35 23 47 37 58 43 -1.41 -124 0 0 36 38 10 1 36 8.1 35 179 1 35 30 37 37 47 38 35 21 57 37 56 50 -1.41 -123 0 0 36 36 47 1 36 12.6 35 180 0 35 29 15 37 46 14 35 20 35 37 55 26 -1.41 -122 0 0 36 35 52 1 36 17.2 35 182 -1 35 28 21 37 45 19 35 19 42 37 54 31 -1.41 -121 0 0 36 35 26 1 36 21.7 35 183 -2 35 27 56 37 44 53 35 19 16 37 54 4 -1.41 -120 0 0 36 35 29 1 36 26.2 35 184 -3 35 27 59 37 44 55 35 19 19 37 54 7 -1.41 -119 0 0 36 36 1 1 36 30.8 35 185 -4 35 28 30 37 45 27 35 19 50 37 54 39 -1.41 -118 0 0 36 37 0 1 36 35.3 35 186 -4 35 29 29 37 46 28 35 20 49 37 55 40 -1.41 -117 0 0 36 38 29 1 36 39.8 35 188 -5 35 30 56 37 47 58 35 22 16 37 57 10 -1.41 -116 0 0 36 40 26 1 36 44.3 35 189 -6 35 32 52 37 49 56 35 24 12 37 59 8 -1.41 -115 0 0 36 42 52 1 36 48.8 35 190 -7 35 35 16 37 52 24 35 26 35 38 1 36 -1.42 -114 0 0 36 45 46 1 36 53.2 34 191 -8 35 38 8 37 55 20 35 29 27 38 4 33 -1.42 -113 0 0 36 49 8 1 36 57.6 34 192 -8 35 41 27 37 58 45 35 32 46 38 7 58 -1.42 -112 0 0 36 52 58 1 37 2.0 34 193 -9 35 45 15 38 2 38 35 36 34 38 11 52 -1.42 -111 0 0 36 57 17 1 37 6.4 34 194 -10 35 49 31 38 7 0 35 40 49 38 16 14 -1.42 -110 0 0 37 2 4 1 37 10.7 33 196 -11 35 54 14 38 11 51 35 45 32 38 21 6 -1.42 -109 0 0 37 7 19 1 37 15.0 33 197 -12 35 59 25 38 17 10 35 50 42 38 26 25 -1.42 -108 0 0 37 13 1 1 37 19.3 33 198 -13 36 5 3 38 22 57 35 56 20 38 32 13 -1.42 -107 0 0 37 19 11 1 37 23.5 32 199 -13 36 11 9 38 29 12 36 2 25 38 38 28 -1.42 -106 0 0 37 25 49 1 37 27.7 32 200 -14 36 17 42 38 35 55 36 8 57 38 45 12 -1.42 -105 0 0 37 32 54 1 37 31.8 32 201 -15 36 24 42 38 43 6 36 15 57 38 52 24 -1.42 -104 0 0 37 40 27 1 37 35.9 31 202 -16 36 32 9 38 50 44 36 23 23 39 0 3 -1.42 -103 0 0 37 48 26 1 37 39.9 31 203 -17 36 40 2 38 58 50 36 31 16 39 8 10 -1.42 -102 0 0 37 56 52 1 37 43.9 30 204 -17 36 48 22 39 7 23 36 39 35 39 16 43 -1.42 -101 0 0 38 5 45 1 37 47.8 30 205 -18 36 57 8 39 16 23 36 48 21 39 25 44 -1.42 -100 0 0 38 15 4 1 37 51.7 29 206 -19 37 6 21 39 25 49 36 57 32 39 35 12 -1.42 - 99 0 0 38 24 49 1 37 55.5 29 207 -20 37 15 59 39 35 42 37 7 9 39 45 6 -1.42 - 98 0 0 38 35 0 1 37 59.2 28 208 -20 37 26 3 39 46 1 37 17 12 39 55 26 -1.42 - 97 0 0 38 45 37 1 38 2.9 28 209 -21 37 36 31 39 56 46 37 27 40 40 6 12 -1.42 - 96 0 0 38 56 39 1 38 6.5 27 210 -22 37 47 26 40 7 57 37 38 33 40 17 24 -1.42 - 95 0 0 39 8 6 1 38 10.0 27 211 -23 37 58 44 40 19 33 37 49 51 40 29 1 -1.42 - 94 0 0 39 19 58 1 38 13.5 26 212 -23 38 10 27 40 31 34 38 1 33 40 41 4 -1.42 - 93 0 0 39 32 14 1 38 16.9 26 213 -24 38 22 35 40 44 0 38 13 39 40 53 31 -1.42 - 92 0 0 39 44 54 1 38 20.2 25 214 -25 38 35 6 40 56 50 38 26 9 41 6 22 -1.42 - 91 0 0 39 57 58 1 38 23.4 24 215 -26 38 48 1 41 10 4 38 39 3 41 19 38 -1.42 - 90 0 0 40 11 25 1 38 26.6 24 215 -26 39 1 18 41 23 42 38 52 19 41 33 17 -1.42 - 89 0 0 40 25 16 1 38 29.6 23 216 -27 39 14 59 41 37 43 39 5 59 41 47 20 -1.42 - 88 0 0 40 39 29 1 38 32.6 22 217 -28 39 29 2 41 52 7 39 20 0 42 1 46 -1.42 - 87 0 0 40 54 4 1 38 35.5 22 218 -28 39 43 27 42 6 54 39 34 24 42 16 34 -1.42 - 86 0 0 41 9 1 1 38 38.3 21 219 -29 39 58 13 42 22 3 39 49 9 42 31 44 -1.42 - 85 0 0 41 24 19 1 38 41.1 20 220 -30 40 13 21 42 37 33 40 4 16 42 47 16 -1.42 - 84 0 0 41 39 59 1 38 43.7 20 220 -30 40 28 49 42 53 24 40 19 43 43 3 9 -1.42 - 83 0 0 41 55 59 1 38 46.2 19 221 -31 40 44 38 43 9 37 40 35 30 43 19 23 -1.42 - 82 0 0 42 12 19 1 38 48.7 18 222 -32 41 0 47 43 26 9 40 51 37 43 35 57 -1.42 - 81 0 0 42 28 58 1 38 51.0 18 223 -32 41 17 15 43 43 1 41 8 4 43 52 51 -1.42 - 80 0 0 42 45 57 1 38 53.3 17 224 -33 41 34 2 44 0 13 41 24 49 44 10 4 -1.42 - 79 0 0 43 3 14 1 38 55.5 16 224 -33 41 51 7 44 17 43 41 41 53 44 27 36 -1.42 - 78 0 0 43 20 49 1 38 57.5 15 225 -34 42 8 30 44 35 31 41 59 15 44 45 26 -1.42 - 77 0 0 43 38 42 1 38 59.5 15 226 -35 42 26 11 44 53 37 42 16 54 45 3 34 -1.42 - 76 0 0 43 56 51 1 39 1.4 14 227 -35 42 44 8 45 12 0 42 34 50 45 21 59 -1.43 - 75 0 0 44 15 17 1 39 3.1 13 228 -36 43 2 22 45 30 40 42 53 2 45 40 41 -1.43 - 74 0 0 44 33 59 1 39 4.8 12 228 -36 43 20 51 45 49 35 43 11 30 45 59 38 -1.43 - 73 0 0 44 52 56 1 39 6.4 12 229 -37 43 39 36 46 8 46 43 30 13 46 18 51 -1.43 - 72 0 0 45 12 8 1 39 7.8 11 230 -37 43 58 35 46 28 12 43 49 10 46 38 18 -1.43 - 71 0 0 45 31 33 1 39 9.2 10 231 -37 44 17 48 46 47 51 44 8 22 46 58 0 -1.43 - 70 0 0 45 51 13 1 39 10.5 10 231 -38 44 37 15 47 7 44 44 27 47 47 17 55 -1.43 - 69 0 0 46 11 5 1 39 11.6 9 232 -38 44 56 54 47 27 50 44 47 25 47 38 3 -1.44 - 68 0 0 46 31 9 1 39 12.7 8 233 -39 45 16 46 47 48 8 45 7 15 47 58 23 -1.44 - 67 0 0 46 51 24 1 39 13.7 7 234 -39 45 36 49 48 8 38 45 27 17 48 18 54 -1.44 - 66 0 0 47 11 51 1 39 14.5 6 234 -39 45 57 3 48 29 18 45 47 29 48 39 37 -1.45 - 65 0 0 47 32 27 1 39 15.3 6 235 -40 46 17 27 48 50 9 46 7 52 49 0 29 -1.45 - 64 0 0 47 53 14 1 39 16.0 5 236 -40 46 38 1 49 11 9 46 28 24 49 21 31 -1.46 - 63 0 0 48 14 9 1 39 16.5 4 237 -40 46 58 44 49 32 18 46 49 5 49 42 42 -1.47 - 62 0 0 48 35 12 1 39 17.0 3 237 -40 47 19 35 49 53 35 47 9 55 50 4 0 -1.48 - 61 0 0 48 56 23 1 39 17.4 3 238 -41 47 40 33 50 14 59 47 30 52 50 25 26 -1.51 - 60 0 0 49 17 40 1 39 17.7 2 239 -41 48 1 39 50 36 29 47 51 56 50 46 59 -1.54 - 59 0 0 49 39 4 1 39 17.9 1 240 -41 48 22 51 50 58 6 48 13 7 51 8 37 -1.63 - 58 0 0 50 0 32 1 39 18.0 1 240 -41 48 44 8 .. .. .. 48 34 22 .. .. .. -1.96 - 57 0 0 .. .. .... .. .. .. .. .. .. 49 5 30 .. .. .. 48 55 43 .. .. .. .... Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 359-170519 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 49 41.6410 DE: -18 15 08.086 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 49 41.6409 DE: -18 15 08.086 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.5 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (168) Sibylla asteroid class: approx. diameter [km]: 146 approx. diameter ["]: 0.061 distance from Earth [AU]: 3.31430 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#66 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): 0.019", 0.003", 83.441° remarks: * orbital elements for (168)Sibylla : Mean anomaly = 285.2538859211 deg Arg. of pericenter = 176.4348493641 deg Long. of node = 205.9169417780 deg Inclination = 4.6705642219 deg Eccentricity = 0.0747573671 Semimajor axis = 3.3735900506 AU Perihelion dist = 3.1213893409 AU Mag: H = 8.09, G = 0.15 Epoch of elements : MJD 60596.06683912 TDT (2024 Oct 13.0668) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#662023Apr24,7.26,2024,10,13,1.604137,0.012466,0.814579,11.335822,-0.175107,0.005780,0.000585,0.000000,0.000000 -123.3912,-18.2244,152.50,-7.90,False UCAC4 359-170519,18.82823363,-18.2522460,12.10,11.48,11.15,0.0,0,,18.85225841,-18.2243992,2.81,2.70,0,0,1 168,Sibylla,14.20,145.806,3.3143,0,0,2.111,-0.47,,7.2,0 0,285.0842,2024,10,12,176.4348,205.9169,4.6706,0.07476,3.37359,3.12139,8.08,5.0,0.15 1.065,0.0193,0.0031,83,0.0040,Known errors,0.85,0,-1,-1 20241013_170519,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org