IOTA/IOTA-ES occultation update for (4179) Toutatis / UCAC4 335-138077 event on 2024 Jul 29, 22:40 UT Visible from Summary ------- On 2024 Jul 29 UT, the 2.893 km diameter asteroid (4179) Toutatis will occult a 13.5 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 4.78 mag to 18.23 mag (the magnitude of the asteroid) for at most 0.270 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: 97 * date and approx. time of event: 2024 Jul 29, 22:33 - 2024 Jul 29, 22:46 * geocentric midpoint of event [JD]: 2460521.44451380 * magnitude of target star: 13.46 * magnitude drop [mag]: 4.78 * estimated maximum duration [s]: 0.270 * Moon: 30 % sunlit, 148° distance * Sun: 146° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 5 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 0.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.004, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.004", 0.001", 73°) * approx speed of asteroid's shadow [km/s]: 10.8306 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 335-138077 by 4179 Toutatis on 2024 Jul 29 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 - 80 0 0 44 57 24 22 46 3.0 1 125 20 44 58 59 44 55 50 45 0 12 44 54 37 .... - 79 0 0 44 29 6 22 46 2.8 2 125 19 44 30 40 44 27 32 44 31 53 44 26 20 -0.82 - 78 0 0 44 1 3 22 46 2.3 2 126 18 44 2 36 43 59 29 44 3 48 43 58 17 -1.00 - 77 0 0 43 33 15 22 46 1.5 3 127 18 43 34 48 43 31 43 43 36 0 43 30 31 -1.08 - 76 0 0 43 5 45 22 46 0.6 4 127 17 43 7 17 43 4 13 43 8 29 43 3 1 -1.14 - 75 0 0 42 38 32 22 45 59.5 5 128 16 42 40 4 42 37 0 42 41 15 42 35 49 -1.17 - 74 0 0 42 11 38 22 45 58.1 6 129 15 42 13 10 42 10 7 42 14 21 42 8 56 -1.19 - 73 0 0 41 45 4 22 45 56.5 7 129 14 41 46 35 41 43 33 41 47 45 41 42 22 -1.21 - 72 0 0 41 18 49 22 45 54.7 8 130 14 41 20 20 41 17 19 41 21 30 41 16 9 -1.23 - 71 0 0 40 52 56 22 45 52.7 8 131 13 40 54 26 40 51 26 40 55 36 40 50 17 -1.24 - 70 0 0 40 27 25 22 45 50.5 9 131 12 40 28 54 40 25 55 40 30 4 40 24 46 -1.25 - 69 0 0 40 2 16 22 45 48.0 10 132 11 40 3 45 40 0 47 40 4 54 39 59 38 -1.25 - 68 0 0 39 37 30 22 45 45.3 11 133 10 39 38 59 39 36 1 39 40 7 39 34 53 -1.26 - 67 0 0 39 13 8 22 45 42.5 12 133 9 39 14 36 39 11 40 39 15 45 39 10 32 -1.27 - 66 0 0 38 49 10 22 45 39.4 13 134 9 38 50 38 38 47 43 38 51 46 38 46 35 -1.27 - 65 0 0 38 25 38 22 45 36.1 13 135 8 38 27 5 38 24 10 38 28 13 38 23 3 -1.27 - 64 0 0 38 2 30 22 45 32.6 14 135 7 38 3 57 38 1 3 38 5 5 37 59 56 -1.28 - 63 0 0 37 39 49 22 45 28.9 15 136 6 37 41 16 37 38 23 37 42 23 37 37 16 -1.28 - 62 0 0 37 17 35 22 45 25.0 16 137 5 37 19 1 37 16 9 37 20 8 37 15 2 -1.28 - 61 0 0 36 55 47 22 45 20.9 17 137 4 36 57 13 36 54 22 36 58 19 36 53 15 -1.28 - 60 0 0 36 34 27 22 45 16.6 18 138 3 36 35 53 36 33 2 36 36 59 36 31 56 -1.29 - 59 0 0 36 13 35 22 45 12.1 18 139 3 36 15 0 36 12 10 36 16 6 36 11 5 -1.29 - 58 0 0 35 53 11 22 45 7.5 19 140 2 35 54 36 35 51 47 35 55 42 35 50 41 -1.29 - 57 0 0 35 33 16 22 45 2.6 20 140 1 35 34 41 35 31 52 35 35 46 35 30 47 -1.29 - 56 0 0 35 13 50 22 44 57.6 21 141 0 35 15 14 35 12 27 35 16 19 35 11 22 -1.29 - 55 0 0 34 54 54 22 44 52.4 21 142 -1 34 56 17 34 53 30 34 57 22 34 52 26 -1.29 - 54 0 0 34 36 27 22 44 47.0 22 142 -2 34 37 50 34 35 4 34 38 54 34 33 59 -1.29 - 53 0 0 34 18 30 22 44 41.5 23 143 -3 34 19 53 34 17 7 34 20 57 34 16 3 -1.30 - 52 0 0 34 1 3 22 44 35.8 24 144 -4 34 2 26 33 59 41 34 3 30 33 58 37 -1.30 - 51 0 0 33 44 7 22 44 29.9 24 145 -4 33 45 29 33 42 45 33 46 33 33 41 41 -1.30 - 50 0 0 33 27 42 22 44 23.9 25 145 -5 33 29 4 33 26 20 33 30 7 33 25 17 -1.30 - 49 0 0 33 11 47 22 44 17.7 26 146 -6 33 13 9 33 10 26 33 14 12 33 9 23 -1.30 - 48 0 0 32 56 24 22 44 11.4 26 147 -7 32 57 46 32 55 3 32 58 49 32 54 0 -1.30 - 47 0 0 32 41 33 22 44 5.0 27 148 -8 32 42 54 32 40 12 32 43 57 32 39 9 -1.30 - 46 0 0 32 27 13 22 43 58.4 28 149 -9 32 28 33 32 25 52 32 29 36 32 24 49 -1.30 - 45 0 0 32 13 24 22 43 51.6 28 150 -9 32 14 45 32 12 4 32 15 47 32 11 1 -1.30 - 44 0 0 32 0 8 22 43 44.8 29 150 -10 32 1 28 31 58 48 32 2 30 31 57 46 -1.30 - 43 0 0 31 47 24 22 43 37.8 29 151 -11 31 48 44 31 46 4 31 49 46 31 45 2 -1.30 - 42 0 0 31 35 12 22 43 30.7 30 152 -12 31 36 31 31 33 52 31 37 33 31 32 50 -1.30 - 41 0 0 31 23 32 22 43 23.5 30 153 -13 31 24 51 31 22 12 31 25 53 31 21 11 -1.30 - 40 0 0 31 12 25 22 43 16.1 31 154 -13 31 13 44 31 11 5 31 14 46 31 10 4 -1.30 - 39 0 0 31 1 50 22 43 8.7 32 155 -14 31 3 9 31 0 31 31 4 11 30 59 29 -1.30 - 38 0 0 30 51 48 22 43 1.2 32 156 -15 30 53 7 30 50 29 30 54 8 30 49 28 -1.30 - 37 0 0 30 42 19 22 42 53.5 32 157 -16 30 43 38 30 41 0 30 44 39 30 39 59 -1.30 - 36 0 0 30 33 22 22 42 45.8 33 158 -17 30 34 41 30 32 4 30 35 42 30 31 3 -1.30 - 35 0 0 30 24 59 22 42 38.0 33 159 -17 30 26 17 30 23 40 30 27 18 30 22 39 -1.30 - 34 0 0 30 17 8 22 42 30.1 34 160 -18 30 18 27 30 15 50 30 19 28 30 14 49 -1.30 - 33 0 0 30 9 51 22 42 22.1 34 160 -19 30 11 9 30 8 32 30 12 10 30 7 32 -1.30 - 32 0 0 30 3 6 22 42 14.0 35 161 -20 30 4 25 30 1 48 30 5 25 30 0 48 -1.30 - 31 0 0 29 56 55 22 42 5.9 35 163 -20 29 58 13 29 55 37 29 59 14 29 54 37 -1.30 - 30 0 0 29 51 17 22 41 57.7 35 164 -21 29 52 35 29 49 59 29 53 35 29 48 59 -1.30 - 29 0 0 29 46 12 22 41 49.4 36 165 -22 29 47 30 29 44 54 29 48 30 29 43 54 -1.30 - 28 0 0 29 41 40 22 41 41.1 36 166 -23 29 42 58 29 40 23 29 43 58 29 39 22 -1.30 - 27 0 0 29 37 42 22 41 32.7 36 167 -23 29 39 0 29 36 24 29 40 0 29 35 24 -1.30 - 26 0 0 29 34 17 22 41 24.3 36 168 -24 29 35 35 29 32 59 29 36 35 29 31 59 -1.30 - 25 0 0 29 31 25 22 41 15.9 37 169 -25 29 32 43 29 30 7 29 33 43 29 29 7 -1.30 - 24 0 0 29 29 7 22 41 7.4 37 170 -25 29 30 24 29 27 49 29 31 24 29 26 49 -1.30 - 23 0 0 29 27 21 22 40 58.8 37 171 -26 29 28 39 29 26 4 29 29 39 29 25 4 -1.30 - 22 0 0 29 26 9 22 40 50.3 37 172 -26 29 27 27 29 24 52 29 28 27 29 23 52 -1.30 - 21 0 0 29 25 31 22 40 41.7 37 173 -27 29 26 48 29 24 13 29 27 48 29 23 13 -1.30 - 20 0 0 29 25 26 22 40 33.1 37 174 -28 29 26 43 29 24 8 29 27 43 29 23 8 -1.30 - 19 0 0 29 25 54 22 40 24.5 37 175 -28 29 27 11 29 24 36 29 28 11 29 23 36 -1.31 - 18 0 0 29 26 55 22 40 15.8 37 177 -29 29 28 13 29 25 37 29 29 13 29 24 37 -1.31 - 17 0 0 29 28 30 22 40 7.2 37 178 -29 29 29 47 29 27 12 29 30 47 29 26 12 -1.31 - 16 0 0 29 30 38 22 39 58.6 37 179 -30 29 31 55 29 29 20 29 32 55 29 28 20 -1.31 - 15 0 0 29 33 19 22 39 49.9 37 180 -30 29 34 37 29 32 1 29 35 37 29 31 1 -1.31 - 14 0 0 29 36 33 22 39 41.3 37 181 -31 29 37 51 29 35 15 29 38 51 29 34 15 -1.31 - 13 0 0 29 40 21 22 39 32.7 37 182 -31 29 41 39 29 39 3 29 42 39 29 38 3 -1.31 - 12 0 0 29 44 42 22 39 24.1 37 183 -32 29 45 59 29 43 24 29 47 0 29 42 24 -1.31 - 11 0 0 29 49 36 22 39 15.5 37 184 -32 29 50 54 29 48 18 29 51 54 29 47 17 -1.31 - 10 0 0 29 55 3 22 39 7.0 37 185 -33 29 56 21 29 53 45 29 57 21 29 52 44 -1.31 - 9 0 0 30 1 2 22 38 58.4 37 187 -33 30 2 20 29 59 44 30 3 21 29 58 44 -1.31 - 8 0 0 30 7 35 22 38 50.0 36 188 -34 30 8 54 30 6 17 30 9 54 30 5 17 -1.31 - 7 0 0 30 14 41 22 38 41.5 36 189 -34 30 16 0 30 13 23 30 17 0 30 12 22 -1.31 - 6 0 0 30 22 20 22 38 33.1 36 190 -34 30 23 39 30 21 2 30 24 39 30 20 1 -1.31 - 5 0 0 30 30 32 22 38 24.8 36 191 -35 30 31 50 30 29 13 30 32 51 30 28 12 -1.31 - 4 0 0 30 39 16 22 38 16.5 35 192 -35 30 40 35 30 37 57 30 41 36 30 36 56 -1.31 - 3 0 0 30 48 33 22 38 8.3 35 193 -35 30 49 52 30 47 14 30 50 53 30 46 13 -1.31 - 2 0 0 30 58 22 22 38 0.1 35 194 -36 30 59 42 30 57 3 31 0 43 30 56 2 -1.32 - 1 0 0 31 8 44 22 37 52.0 34 195 -36 31 10 4 31 7 25 31 11 5 31 6 24 -1.32 0 0 0 31 19 39 22 37 44.0 34 196 -36 31 20 58 31 18 19 31 22 0 31 17 18 -1.32 1 0 0 31 31 5 22 37 36.0 33 197 -36 31 32 25 31 29 45 31 33 27 31 28 44 -1.32 2 0 0 31 43 4 22 37 28.1 33 198 -36 31 44 24 31 41 44 31 45 25 31 40 42 -1.32 3 0 0 31 55 34 22 37 20.4 33 199 -36 31 56 54 31 54 14 31 57 56 31 53 12 -1.32 4 0 0 32 8 37 22 37 12.7 32 200 -37 32 9 57 32 7 16 32 10 59 32 6 14 -1.32 5 0 0 32 22 11 22 37 5.1 32 201 -37 32 23 31 32 20 50 32 24 34 32 19 48 -1.32 6 0 0 32 36 16 22 36 57.6 31 202 -37 32 37 37 32 34 55 32 38 40 32 33 53 -1.32 7 0 0 32 50 53 22 36 50.2 31 203 -37 32 52 14 32 49 32 32 53 17 32 48 29 -1.32 8 0 0 33 6 1 22 36 43.0 30 204 -37 33 7 22 33 4 39 33 8 25 33 3 36 -1.32 9 0 0 33 21 40 22 36 35.8 29 204 -37 33 23 1 33 20 18 33 24 5 33 19 15 -1.33 10 0 0 33 37 49 22 36 28.8 29 205 -37 33 39 11 33 36 27 33 40 15 33 35 24 -1.33 11 0 0 33 54 29 22 36 21.9 28 206 -37 33 55 51 33 53 7 33 56 55 33 52 3 -1.33 12 0 0 34 11 40 22 36 15.1 28 207 -37 34 13 2 34 10 17 34 14 6 34 9 13 -1.33 13 0 0 34 29 20 22 36 8.5 27 208 -36 34 30 43 34 27 57 34 31 47 34 26 53 -1.33 14 0 0 34 47 30 22 36 2.0 26 209 -36 34 48 53 34 46 7 34 49 58 34 45 2 -1.33 15 0 0 35 6 9 22 35 55.6 26 210 -36 35 7 33 35 4 46 35 8 38 35 3 41 -1.33 16 0 0 35 25 18 22 35 49.4 25 210 -36 35 26 42 35 23 54 35 27 47 35 22 49 -1.33 17 0 0 35 44 56 22 35 43.4 24 211 -36 35 46 20 35 43 32 35 47 25 35 42 26 -1.33 18 0 0 36 5 2 22 35 37.5 24 212 -35 36 6 26 36 3 37 36 7 32 36 2 32 -1.34 19 0 0 36 25 36 22 35 31.7 23 213 -35 36 27 1 36 24 11 36 28 7 36 23 5 -1.34 20 0 0 36 46 38 22 35 26.2 22 214 -35 36 48 3 36 45 12 36 49 9 36 44 6 -1.34 21 0 0 37 8 7 22 35 20.8 21 214 -35 37 9 33 37 6 41 37 10 39 37 5 35 -1.34 22 0 0 37 30 2 22 35 15.5 21 215 -34 37 31 29 37 28 36 37 32 35 37 27 30 -1.34 23 0 0 37 52 24 22 35 10.5 20 216 -34 37 53 51 37 50 58 37 54 58 37 49 51 -1.34 24 0 0 38 15 12 22 35 5.6 19 217 -33 38 16 39 38 13 45 38 17 47 38 12 38 -1.34 25 0 0 38 38 26 22 35 0.9 18 217 -33 38 39 53 38 36 58 38 41 1 38 35 51 -1.34 26 0 0 39 2 4 22 34 56.4 18 218 -33 39 3 32 39 0 36 39 4 40 38 59 28 -1.35 27 0 0 39 26 7 22 34 52.1 17 219 -32 39 27 35 39 24 39 39 28 43 39 23 30 -1.35 28 0 0 39 50 33 22 34 48.0 16 220 -32 39 52 2 39 49 5 39 53 11 39 47 56 -1.35 29 0 0 40 15 23 22 34 44.1 15 220 -31 40 16 52 40 13 54 40 18 1 40 12 45 -1.35 30 0 0 40 40 35 22 34 40.4 14 221 -31 40 42 4 40 39 5 40 43 14 40 37 56 -1.35 31 0 0 41 6 9 22 34 36.9 14 222 -30 41 7 39 41 4 39 41 8 49 41 3 29 -1.35 32 0 0 41 32 4 22 34 33.6 13 222 -30 41 33 34 41 30 33 41 34 44 41 29 23 -1.36 33 0 0 41 58 19 22 34 30.4 12 223 -29 41 59 50 41 56 48 42 1 0 41 55 37 -1.36 34 0 0 42 24 54 22 34 27.5 11 224 -28 42 26 25 42 23 22 42 27 36 42 22 12 -1.36 35 0 0 42 51 48 22 34 24.9 10 225 -28 42 53 20 42 50 16 42 54 31 42 49 5 -1.36 36 0 0 43 18 59 22 34 22.4 10 225 -27 43 20 32 43 17 27 43 21 43 43 16 15 -1.37 37 0 0 43 46 28 22 34 20.1 9 226 -27 43 48 1 43 44 55 43 49 13 43 43 43 -1.37 38 0 0 44 14 13 22 34 18.1 8 227 -26 44 15 46 44 12 40 44 16 59 44 11 27 -1.37 39 0 0 44 42 13 22 34 16.2 7 227 -25 44 43 47 44 40 39 44 45 0 44 39 27 -1.38 40 0 0 45 10 27 22 34 14.6 6 228 -25 45 12 2 45 8 53 45 13 15 45 7 40 -1.38 41 0 0 45 38 55 22 34 13.2 5 229 -24 45 40 30 45 37 21 45 41 44 45 36 7 -1.39 42 0 0 46 7 36 22 34 12.0 5 230 -23 46 9 11 46 6 1 46 10 25 46 4 47 -1.40 43 0 0 46 36 27 22 34 11.0 4 230 -23 46 38 3 46 34 52 46 39 17 46 33 38 -1.41 44 0 0 47 5 29 22 34 10.2 3 231 -22 47 7 6 47 3 53 47 8 20 47 2 39 -1.43 45 0 0 47 34 41 22 34 9.6 2 232 -21 47 36 17 47 33 4 47 37 32 47 31 49 -1.47 46 0 0 48 4 0 22 34 9.2 1 232 -21 48 5 37 48 2 23 48 6 52 48 1 8 -1.56 47 0 0 48 33 26 22 34 9.1 0 233 -20 48 35 4 48 31 49 48 36 19 48 30 33 -2.04 Uncertainty in time = +/- 0 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 335-138077 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 10 58.1301 DE: -23 11 11.447 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 10 58.1301 DE: -23 11 11.447 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 13.5 * B mag [mag]: 14.6 * 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]: 1.18630 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): 0.004", 0.001", 73.43° remarks: * orbital elements for (4179)Toutatis : Mean anomaly = 320.4680635456 deg Arg. of pericenter = 277.8733844124 deg Long. of node = 125.3590763104 deg Inclination = 0.4480278059 deg Eccentricity = 0.6247586419 Semimajor axis = 2.5434135038 AU Perihelion dist = 0.9543939373 AU Mag: H = 15.32, G = 0.10 Epoch of elements : MJD 60520.94451370 TDT (2024 Jul 29.9445) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#6272023Jun16,0.27,2024,7,29,22.668331,-0.028685,0.792496,-6.109085,-0.220727,0.002914,0.000044,0.000001,0.000000 -14.9739,-23.1819,-158.41,18.45,False UCAC4 335-138077,18.18281393,-23.1865129,14.58,13.46,12.86,0.0,0,,18.20800803,-23.1818536,4.78,4.93,0,0,1 4179,Toutatis,18.23,2.893,1.1863,0,0,-3.283,-1.63,,0.0,0 0,320.2386,2024,7,29,277.8734,125.3591,0.4480,0.62476,2.54341,0.95439,15.32,5.0,0.10 1.387,0.0040,0.0009,73,0.0013,Known errors,0.91,0,-1,-1 20240729_138077,60140.22 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 05:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org