IOTA/IOTA-ES occultation update for (4179) Toutatis / UCAC4 335-187231 event on 2024 Oct 22, 00:54 UT Visible from Summary ------- On 2024 Oct 22 UT, the 2.902 km diameter asteroid (4179) Toutatis will occult a 12.1 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 6.32 mag to 18.44 mag (the magnitude of the asteroid) for at most 0.150 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 Oct 22, 00:49 - 2024 Oct 22, 00:58 * geocentric midpoint of event [JD]: 2460605.53751688 * magnitude of target star: 12.12 * magnitude drop [mag]: 6.32 * estimated maximum duration [s]: 0.150 * Moon: 73 % sunlit, 169° distance * Sun: 72° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 4 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 0.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.002, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.002", 0.000", 75°) * approx speed of asteroid's shadow [km/s]: 19.3230 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 335-187231 by 4179 Toutatis on 2024 Oct 22 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 167 0 0 35 58 18 0 50 4.3 0 119 43 35 57 4 35 59 33 35 56 42 35 59 54 .... 168 0 0 35 31 22 0 50 4.4 1 120 43 35 30 7 35 32 36 35 29 46 35 32 57 -0.45 169 0 0 35 4 37 0 50 4.6 2 120 44 35 3 23 35 5 51 35 3 2 35 6 12 -0.66 170 0 0 34 38 4 0 50 4.9 3 121 44 34 36 50 34 39 18 34 36 29 34 39 39 -0.74 171 0 0 34 11 45 0 50 5.4 4 122 44 34 10 31 34 12 58 34 10 10 34 13 19 -0.79 172 0 0 33 45 39 0 50 6.0 5 122 44 33 44 26 33 46 52 33 44 5 33 47 13 -0.82 173 0 0 33 19 48 0 50 6.7 6 123 45 33 18 35 33 21 2 33 18 14 33 21 22 -0.84 174 0 0 32 54 13 0 50 7.5 7 123 45 32 53 0 32 55 26 32 52 40 32 55 47 -0.86 175 0 0 32 28 55 0 50 8.5 8 124 45 32 27 42 32 30 7 32 27 21 32 30 28 -0.87 176 0 0 32 3 53 0 50 9.6 9 124 45 32 2 41 32 5 6 32 2 20 32 5 26 -0.88 177 0 0 31 39 10 0 50 10.8 10 125 45 31 37 57 31 40 22 31 37 37 31 40 43 -0.89 178 0 0 31 14 45 0 50 12.1 11 125 45 31 13 33 31 15 57 31 13 12 31 16 17 -0.89 179 0 0 30 50 39 0 50 13.6 12 126 46 30 49 27 30 51 51 30 49 7 30 52 12 -0.90 -180 0 0 30 26 54 0 50 15.2 13 127 46 30 25 42 30 28 5 30 25 22 30 28 26 -0.90 -179 0 0 30 3 29 0 50 16.9 13 127 46 30 2 18 30 4 41 30 1 57 30 5 1 -0.91 -178 0 0 29 40 26 0 50 18.7 14 128 46 29 39 15 29 41 37 29 38 54 29 41 57 -0.91 -177 0 0 29 17 45 0 50 20.7 15 128 45 29 16 34 29 18 56 29 16 13 29 19 16 -0.91 -176 0 0 28 55 26 0 50 22.7 16 129 45 28 54 15 28 56 37 28 53 55 28 56 57 -0.92 -175 0 0 28 33 31 0 50 24.9 17 129 45 28 32 20 28 34 41 28 32 0 28 35 1 -0.92 -174 0 0 28 11 59 0 50 27.2 18 130 45 28 10 49 28 13 10 28 10 29 28 13 30 -0.92 -173 0 0 27 50 52 0 50 29.7 19 130 45 27 49 42 27 52 3 27 49 22 27 52 22 -0.92 -172 0 0 27 30 10 0 50 32.2 20 131 45 27 29 0 27 31 20 27 28 41 27 31 40 -0.93 -171 0 0 27 9 54 0 50 34.9 21 132 44 27 8 44 27 11 4 27 8 24 27 11 24 -0.93 -170 0 0 26 50 3 0 50 37.7 22 132 44 26 48 54 26 51 13 26 48 34 26 51 33 -0.93 -169 0 0 26 30 40 0 50 40.5 23 133 44 26 29 30 26 31 49 26 29 10 26 32 9 -0.93 -168 0 0 26 11 43 0 50 43.5 23 133 44 26 10 33 26 12 52 26 10 14 26 13 11 -0.93 -167 0 0 25 53 13 0 50 46.7 24 134 43 25 52 4 25 54 22 25 51 45 25 54 42 -0.93 -166 0 0 25 35 12 0 50 49.9 25 135 43 25 34 3 25 36 20 25 33 43 25 36 40 -0.94 -165 0 0 25 17 38 0 50 53.2 26 135 42 25 16 30 25 18 47 25 16 10 25 19 6 -0.94 -164 0 0 25 0 34 0 50 56.6 27 136 42 24 59 25 25 1 42 24 59 6 25 2 2 -0.94 -163 0 0 24 43 58 0 51 0.1 28 137 41 24 42 50 24 45 6 24 42 30 24 45 26 -0.94 -162 0 0 24 27 52 0 51 3.7 29 137 41 24 26 44 24 29 0 24 26 24 24 29 19 -0.94 -161 0 0 24 12 16 0 51 7.5 29 138 40 24 11 8 24 13 24 24 10 48 24 13 43 -0.94 -160 0 0 23 57 9 0 51 11.3 30 139 40 23 56 2 23 58 17 23 55 42 23 58 37 -0.94 -159 0 0 23 42 34 0 51 15.2 31 140 39 23 41 26 23 43 41 23 41 7 23 44 1 -0.94 -158 0 0 23 28 29 0 51 19.2 32 140 39 23 27 21 23 29 36 23 27 2 23 29 55 -0.95 -157 0 0 23 14 55 0 51 23.3 32 141 38 23 13 47 23 16 2 23 13 28 23 16 21 -0.95 -156 0 0 23 1 52 0 51 27.4 33 142 38 23 0 45 23 2 59 23 0 26 23 3 19 -0.95 -155 0 0 22 49 21 0 51 31.7 34 143 37 22 48 14 22 50 28 22 47 55 22 50 47 -0.95 -154 0 0 22 37 22 0 51 36.0 35 143 36 22 36 15 22 38 29 22 35 56 22 38 48 -0.95 -153 0 0 22 25 55 0 51 40.4 35 144 36 22 24 48 22 27 2 22 24 29 22 27 21 -0.95 -152 0 0 22 15 0 0 51 44.9 36 145 35 22 13 53 22 16 7 22 13 34 22 16 26 -0.95 -151 0 0 22 4 37 0 51 49.5 37 146 34 22 3 31 22 5 44 22 3 12 22 6 3 -0.95 -150 0 0 21 54 48 0 51 54.1 37 147 33 21 53 41 21 55 54 21 53 22 21 56 13 -0.95 -149 0 0 21 45 31 0 51 58.8 38 148 33 21 44 24 21 46 37 21 44 5 21 46 56 -0.95 -148 0 0 21 36 47 0 52 3.5 39 149 32 21 35 40 21 37 53 21 35 21 21 38 12 -0.95 -147 0 0 21 28 36 0 52 8.4 39 150 31 21 27 30 21 29 42 21 27 11 21 30 1 -0.95 -146 0 0 21 20 58 0 52 13.3 40 151 30 21 19 52 21 22 4 21 19 33 21 22 23 -0.96 -145 0 0 21 13 54 0 52 18.2 40 152 30 21 12 48 21 15 0 21 12 29 21 15 19 -0.96 -144 0 0 21 7 24 0 52 23.2 41 153 29 21 6 18 21 8 30 21 5 59 21 8 49 -0.96 -143 0 0 21 1 27 0 52 28.2 41 154 28 21 0 21 21 2 33 21 0 2 21 2 52 -0.96 -142 0 0 20 56 4 0 52 33.3 42 155 27 20 54 58 20 57 10 20 54 39 20 57 29 -0.96 -141 0 0 20 51 15 0 52 38.5 42 156 26 20 50 9 20 52 21 20 49 50 20 52 40 -0.96 -140 0 0 20 47 0 0 52 43.7 43 157 26 20 45 54 20 48 6 20 45 35 20 48 24 -0.96 -139 0 0 20 43 19 0 52 48.9 43 159 25 20 42 13 20 44 25 20 41 54 20 44 43 -0.96 -138 0 0 20 40 12 0 52 54.2 44 160 24 20 39 6 20 41 18 20 38 48 20 41 36 -0.96 -137 0 0 20 37 39 0 52 59.5 44 161 23 20 36 34 20 38 45 20 36 15 20 39 4 -0.96 -136 0 0 20 35 41 0 53 4.8 44 162 22 20 34 35 20 36 46 20 34 16 20 37 5 -0.96 -135 0 0 20 34 16 0 53 10.2 45 163 21 20 33 11 20 35 22 20 32 52 20 35 41 -0.96 -134 0 0 20 33 26 0 53 15.6 45 165 20 20 32 21 20 34 32 20 32 2 20 34 51 -0.96 -133 0 0 20 33 11 0 53 21.1 45 166 19 20 32 5 20 34 16 20 31 47 20 34 35 -0.96 -132 0 0 20 33 29 0 53 26.5 45 167 18 20 32 24 20 34 35 20 32 5 20 34 54 -0.96 -131 0 0 20 34 23 0 53 32.0 46 169 18 20 33 17 20 35 28 20 32 58 20 35 47 -0.96 -130 0 0 20 35 50 0 53 37.5 46 170 17 20 34 44 20 36 56 20 34 26 20 37 14 -0.96 -129 0 0 20 37 52 0 53 43.0 46 171 16 20 36 46 20 38 57 20 36 27 20 39 16 -0.96 -128 0 0 20 40 28 0 53 48.5 46 173 15 20 39 22 20 41 33 20 39 3 20 41 52 -0.96 -127 0 0 20 43 38 0 53 54.0 46 174 14 20 42 32 20 44 44 20 42 13 20 45 2 -0.96 -126 0 0 20 47 22 0 53 59.5 46 175 13 20 46 17 20 48 28 20 45 58 20 48 47 -0.96 -125 0 0 20 51 41 0 54 5.0 46 177 12 20 50 35 20 52 47 20 50 16 20 53 6 -0.96 -124 0 0 20 56 34 0 54 10.6 46 178 11 20 55 28 20 57 40 20 55 9 20 57 58 -0.96 -123 0 0 21 2 1 0 54 16.1 46 179 10 21 0 55 21 3 7 21 0 36 21 3 25 -0.96 -122 0 0 21 8 1 0 54 21.6 46 181 9 21 6 55 21 9 7 21 6 37 21 9 26 -0.96 -121 0 0 21 14 36 0 54 27.1 46 182 8 21 13 30 21 15 42 21 13 11 21 16 1 -0.96 -120 0 0 21 21 44 0 54 32.6 46 183 7 21 20 38 21 22 51 21 20 19 21 23 9 -0.96 -119 0 0 21 29 27 0 54 38.1 45 185 6 21 28 20 21 30 33 21 28 1 21 30 52 -0.96 -118 0 0 21 37 42 0 54 43.5 45 186 5 21 36 36 21 38 49 21 36 17 21 39 7 -0.96 -117 0 0 21 46 31 0 54 49.0 45 187 4 21 45 25 21 47 38 21 45 6 21 47 57 -0.97 -116 0 0 21 55 54 0 54 54.4 45 189 3 21 54 47 21 57 0 21 54 28 21 57 19 -0.97 -115 0 0 22 5 49 0 54 59.8 44 190 3 22 4 42 22 6 56 22 4 23 22 7 15 -0.97 -114 0 0 22 16 17 0 55 5.2 44 191 2 22 15 11 22 17 24 22 14 52 22 17 43 -0.97 -113 0 0 22 27 18 0 55 10.5 44 192 1 22 26 12 22 28 25 22 25 53 22 28 44 -0.97 -112 0 0 22 38 52 0 55 15.8 43 194 0 22 37 45 22 39 59 22 37 26 22 40 18 -0.97 -111 0 0 22 50 58 0 55 21.0 43 195 -1 22 49 51 22 52 5 22 49 32 22 52 25 -0.97 -110 0 0 23 3 36 0 55 26.2 42 196 -2 23 2 29 23 4 44 23 2 10 23 5 3 -0.97 -109 0 0 23 16 47 0 55 31.4 42 197 -3 23 15 39 23 17 54 23 15 20 23 18 13 -0.96 -108 0 0 23 30 28 0 55 36.5 41 198 -4 23 29 21 23 31 36 23 29 2 23 31 55 -0.96 -107 0 0 23 44 42 0 55 41.6 41 199 -5 23 43 34 23 45 49 23 43 15 23 46 9 -0.96 -106 0 0 23 59 26 0 55 46.6 40 201 -6 23 58 18 24 0 34 23 57 59 24 0 53 -0.96 -105 0 0 24 14 41 0 55 51.6 40 202 -7 24 13 33 24 15 49 24 13 14 24 16 8 -0.96 -104 0 0 24 30 27 0 55 56.5 39 203 -8 24 29 18 24 31 35 24 28 59 24 31 54 -0.96 -103 0 0 24 46 42 0 56 1.3 38 204 -9 24 45 34 24 47 51 24 45 15 24 48 10 -0.96 -102 0 0 25 3 28 0 56 6.1 38 205 -10 25 2 20 25 4 37 25 2 0 25 4 56 -0.96 -101 0 0 25 20 43 0 56 10.8 37 206 -11 25 19 35 25 21 52 25 19 15 25 22 12 -0.96 -100 0 0 25 38 28 0 56 15.4 36 207 -12 25 37 19 25 39 37 25 36 59 25 39 56 -0.96 - 99 0 0 25 56 41 0 56 20.0 36 208 -13 25 55 32 25 57 50 25 55 12 25 58 10 -0.96 - 98 0 0 26 15 22 0 56 24.5 35 208 -14 26 14 13 26 16 31 26 13 53 26 16 51 -0.96 - 97 0 0 26 34 31 0 56 28.9 34 209 -15 26 33 21 26 35 40 26 33 2 26 36 0 -0.96 - 96 0 0 26 54 7 0 56 33.2 34 210 -16 26 52 58 26 55 17 26 52 38 26 55 37 -0.96 - 95 0 0 27 14 11 0 56 37.4 33 211 -17 27 13 1 27 15 21 27 12 41 27 15 40 -0.96 - 94 0 0 27 34 40 0 56 41.6 32 212 -17 27 33 30 27 35 50 27 33 10 27 36 10 -0.96 - 93 0 0 27 55 36 0 56 45.6 31 213 -18 27 54 25 27 56 46 27 54 5 27 57 6 -0.96 - 92 0 0 28 16 56 0 56 49.6 31 214 -19 28 15 46 28 18 7 28 15 26 28 18 27 -0.96 - 91 0 0 28 38 42 0 56 53.5 30 214 -20 28 37 31 28 39 53 28 37 11 28 40 13 -0.96 - 90 0 0 29 0 52 0 56 57.2 29 215 -21 28 59 41 29 2 3 28 59 20 29 2 23 -0.96 - 89 0 0 29 23 25 0 57 0.9 28 216 -22 29 22 14 29 24 36 29 21 53 29 24 56 -0.96 - 88 0 0 29 46 21 0 57 4.5 27 217 -23 29 45 10 29 47 33 29 44 49 29 47 53 -0.96 - 87 0 0 30 9 40 0 57 8.0 26 217 -24 30 8 28 30 10 51 30 8 8 30 11 12 -0.96 - 86 0 0 30 33 20 0 57 11.3 26 218 -25 30 32 8 30 34 32 30 31 48 30 34 52 -0.96 - 85 0 0 30 57 21 0 57 14.6 25 219 -26 30 56 9 30 58 33 30 55 49 30 58 54 -0.96 - 84 0 0 31 21 43 0 57 17.8 24 220 -26 31 20 30 31 22 55 31 20 10 31 23 16 -0.96 - 83 0 0 31 46 24 0 57 20.8 23 220 -27 31 45 11 31 47 36 31 44 51 31 47 57 -0.96 - 82 0 0 32 11 24 0 57 23.7 22 221 -28 32 10 11 32 12 36 32 9 50 32 12 57 -0.96 - 81 0 0 32 36 41 0 57 26.5 21 222 -29 32 35 28 32 37 54 32 35 8 32 38 15 -0.96 - 80 0 0 33 2 17 0 57 29.2 20 222 -30 33 1 3 33 3 30 33 0 43 33 3 51 -0.96 - 79 0 0 33 28 8 0 57 31.8 19 223 -30 33 26 55 33 29 22 33 26 34 33 29 43 -0.96 - 78 0 0 33 54 16 0 57 34.3 19 224 -31 33 53 2 33 55 29 33 52 41 33 55 50 -0.97 - 77 0 0 34 20 38 0 57 36.6 18 224 -32 34 19 24 34 21 51 34 19 3 34 22 12 -0.97 - 76 0 0 34 47 14 0 57 38.9 17 225 -33 34 46 0 34 48 28 34 45 38 34 48 49 -0.97 - 75 0 0 35 14 3 0 57 41.0 16 226 -33 35 12 49 35 15 17 35 12 27 35 15 38 -0.97 - 74 0 0 35 41 4 0 57 43.0 15 226 -34 35 39 50 35 42 19 35 39 29 35 42 40 -0.97 - 73 0 0 36 8 17 0 57 44.8 14 227 -35 36 7 2 36 9 32 36 6 41 36 9 53 -0.97 - 72 0 0 36 35 40 0 57 46.6 13 228 -36 36 34 25 36 36 55 36 34 4 36 37 16 -0.97 - 71 0 0 37 3 13 0 57 48.2 12 228 -36 37 1 58 37 4 28 37 1 36 37 4 49 -0.97 - 70 0 0 37 30 54 0 57 49.7 11 229 -37 37 29 39 37 32 9 37 29 17 37 32 31 -0.97 - 69 0 0 37 58 43 0 57 51.1 10 230 -38 37 57 28 37 59 59 37 57 6 38 0 20 -0.97 - 68 0 0 38 26 39 0 57 52.4 10 230 -38 38 25 23 38 27 55 38 25 2 38 28 16 -0.97 - 67 0 0 38 54 40 0 57 53.5 9 231 -39 38 53 25 38 55 56 38 53 3 38 56 18 -0.98 - 66 0 0 39 22 47 0 57 54.5 8 232 -39 39 21 31 39 24 3 39 21 9 39 24 25 -0.98 - 65 0 0 39 50 57 0 57 55.5 7 232 -40 39 49 41 39 52 13 39 49 19 39 52 35 -0.98 - 64 0 0 40 19 11 0 57 56.3 6 233 -40 40 17 54 40 20 27 40 17 32 40 20 49 -0.99 - 63 0 0 40 47 26 0 57 56.9 5 233 -41 40 46 9 40 48 43 40 45 48 40 49 4 -0.99 - 62 0 0 41 15 42 0 57 57.5 4 234 -41 41 14 26 41 16 59 41 14 4 41 17 21 -1.00 - 61 0 0 41 43 59 0 57 58.0 3 235 -42 41 42 42 41 45 16 41 42 20 41 45 38 -1.01 - 60 0 0 42 12 15 0 57 58.3 2 235 -42 42 10 58 42 13 32 42 10 36 42 13 54 -1.03 - 59 0 0 42 40 29 0 57 58.5 2 236 -43 42 39 12 42 41 46 42 38 50 42 42 8 -1.07 - 58 0 0 43 8 40 0 57 58.7 1 237 -43 43 7 23 43 9 58 43 7 1 43 10 20 -1.22 Uncertainty in time = +/- 0 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 335-187231 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 46 28.8548 DE: -23 09 10.653 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 46 28.8548 DE: -23 09 10.653 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.1 * B mag [mag]: 12.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (4179) Toutatis asteroid class: approx. diameter [km]: 3 approx. diameter ["]: 0.003 distance from Earth [AU]: 1.34020 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#627 date of fit: 2023 Jun 16 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): 0.002", 0.000", 75.131° remarks: * orbital elements for (4179)Toutatis : Mean anomaly = 340.8996556198 deg Arg. of pericenter = 277.8772057589 deg Long. of node = 125.3589790766 deg Inclination = 0.4480320532 deg Eccentricity = 0.6247573280 Semimajor axis = 2.5432954408 AU Perihelion dist = 0.9543529768 AU Mag: H = 15.32, G = 0.10 Epoch of elements : MJD 60605.03751688 TDT (2024 Oct 22.0375) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#6272023Jun16,0.15,2024,10,22,0.900405,-0.051862,0.691455,10.876281,0.810686,0.003683,0.000299,-0.000001,0.000000 -122.4677,-23.1274,162.61,-11.16,False UCAC4 335-187231,18.77468195,-23.1529591,12.93,12.12,11.68,0.0,0,,18.79954837,-23.1274413,6.32,6.31,0,0,0 4179,Toutatis,18.44,2.902,1.3402,0,0,5.176,5.33,,0.0,0 0,340.6475,2024,10,21,277.8772,125.3590,0.4480,0.62476,2.54330,0.95435,15.32,5.0,0.10 1.142,0.0017,0.0003,75,0.0004,Known errors,0.91,0,-1,-1 20241022_187231,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:38 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org