IOTA/IOTA-ES occultation update for (40316) 1999 LU4 / UCAC4 351-120303 event on 2024 Oct 11, 14:24 UT Visible from Summary ------- On 2024 Oct 11 UT, the 8.877 km diameter asteroid (40316) 1999 LU4 will occult a 11.8 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 6.66 mag to 18.50 mag (the magnitude of the asteroid) for at most 0.320 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: 96 * date and approx. time of event: 2024 Oct 11, 14:21 - 2024 Oct 11, 14:26 * geocentric midpoint of event [JD]: 2460595.10028891 * magnitude of target star: 11.84 * magnitude drop [mag]: 6.66 * estimated maximum duration [s]: 0.320 * Moon: 59 % sunlit, 32° distance * Sun: 70° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 14 * 1 sigma uncertainty interval [path widths]: +/- 0.42 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.002", 116°) * approx speed of asteroid's shadow [km/s]: 27.9062 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 351-120303 by 40316 1999 LU4 on 2024 Oct 11 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 - 14 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. 62 11 35 .. .. .. .... - 13 0 0 61 51 24 14 21 57.3 1 137 18 61 46 1 61 56 47 61 41 36 62 1 15 .... - 12 0 0 61 20 51 14 21 57.4 1 138 18 61 15 28 61 26 15 61 11 2 61 30 43 -0.66 - 11 0 0 60 49 45 14 21 57.5 2 139 18 60 44 21 60 55 9 60 39 55 60 59 37 -0.84 - 10 0 0 60 18 4 14 21 57.7 3 140 19 60 12 41 60 23 29 60 8 15 60 27 57 -0.92 - 9 0 0 59 45 52 14 21 57.9 3 141 19 59 40 28 59 51 16 59 36 2 59 55 45 -0.97 - 8 0 0 59 13 7 14 21 58.2 4 142 19 59 7 44 59 18 32 59 3 18 59 23 0 -1.00 - 7 0 0 58 39 52 14 21 58.6 5 143 19 58 34 29 58 45 16 58 30 3 58 49 45 -1.03 - 6 0 0 58 6 8 14 21 59.0 6 143 19 58 0 45 58 11 31 57 56 19 58 16 0 -1.04 - 5 0 0 57 31 54 14 21 59.5 7 144 20 57 26 32 57 37 18 57 22 6 57 41 46 -1.06 - 4 0 0 56 57 14 14 22 0.1 7 145 20 56 51 52 57 2 37 56 47 26 57 7 4 -1.07 - 3 0 0 56 22 7 14 22 0.8 8 146 20 56 16 46 56 27 30 56 12 21 56 31 57 -1.08 - 2 0 0 55 46 36 14 22 1.5 9 147 20 55 41 15 55 51 58 55 36 51 55 56 24 -1.09 - 1 0 0 55 10 41 14 22 2.3 10 148 20 55 5 21 55 16 2 55 0 58 55 20 28 -1.09 0 0 0 54 34 25 14 22 3.2 11 149 20 54 29 6 54 39 45 54 24 43 54 44 10 -1.10 1 0 0 53 57 48 14 22 4.2 11 149 20 53 52 30 54 3 7 53 48 8 54 7 32 -1.10 2 0 0 53 20 53 14 22 5.2 12 150 20 53 15 36 53 26 11 53 11 15 53 30 34 -1.11 3 0 0 52 43 41 14 22 6.4 13 151 20 52 38 25 52 48 58 52 34 5 52 53 20 -1.11 4 0 0 52 6 14 14 22 7.6 14 152 20 52 0 59 52 11 29 51 56 40 52 15 50 -1.11 5 0 0 51 28 33 14 22 9.0 15 153 20 51 23 20 51 33 47 51 19 1 51 38 7 -1.12 6 0 0 50 50 40 14 22 10.4 16 154 20 50 45 28 50 55 53 50 41 11 51 0 12 -1.12 7 0 0 50 12 38 14 22 11.9 16 155 20 50 7 27 50 17 49 50 3 11 50 22 7 -1.12 8 0 0 49 34 27 14 22 13.5 17 155 20 49 29 18 49 39 37 49 25 3 49 43 53 -1.12 9 0 0 48 56 10 14 22 15.2 18 156 20 48 51 3 49 1 18 48 46 49 49 5 34 -1.13 10 0 0 48 17 49 14 22 17.0 19 157 20 48 12 43 48 22 55 48 8 31 48 27 9 -1.13 11 0 0 47 39 25 14 22 18.9 20 158 20 47 34 21 47 44 30 47 30 10 47 48 43 -1.13 12 0 0 47 1 0 14 22 20.9 21 159 19 46 55 58 47 6 4 46 51 49 47 10 15 -1.13 13 0 0 46 22 37 14 22 23.0 21 160 19 46 17 37 46 27 39 46 13 29 46 31 48 -1.13 14 0 0 45 44 17 14 22 25.2 22 161 19 45 39 18 45 49 17 45 35 12 45 53 25 -1.13 15 0 0 45 6 1 14 22 27.4 23 162 19 45 1 4 45 10 59 44 56 59 45 15 6 -1.14 16 0 0 44 27 52 14 22 29.8 24 163 19 44 22 57 44 32 48 44 18 54 44 36 53 -1.14 17 0 0 43 49 51 14 22 32.2 25 164 18 43 44 58 43 54 45 43 40 56 43 58 49 -1.14 18 0 0 43 12 1 14 22 34.7 26 165 18 43 7 9 43 16 53 43 3 9 43 20 55 -1.14 19 0 0 42 34 22 14 22 37.3 26 165 18 42 29 32 42 39 12 42 25 33 42 43 12 -1.14 20 0 0 41 56 56 14 22 40.0 27 166 17 41 52 8 42 1 44 41 48 11 42 5 43 -1.14 21 0 0 41 19 45 14 22 42.8 28 167 17 41 14 59 41 24 31 41 11 3 41 28 29 -1.14 22 0 0 40 42 51 14 22 45.7 29 168 16 40 38 7 40 47 35 40 34 13 40 51 31 -1.15 23 0 0 40 6 15 14 22 48.6 29 169 16 40 1 33 40 10 57 39 57 40 40 14 51 -1.15 24 0 0 39 29 58 14 22 51.6 30 170 15 39 25 18 39 34 39 39 21 27 39 38 31 -1.15 25 0 0 38 54 2 14 22 54.7 31 172 15 38 49 24 38 58 41 38 45 34 39 2 32 -1.15 26 0 0 38 18 29 14 22 57.8 32 173 14 38 13 52 38 23 6 38 10 4 38 26 55 -1.15 27 0 0 37 43 19 14 23 1.1 32 174 14 37 38 45 37 47 54 37 34 58 37 51 42 -1.15 28 0 0 37 8 35 14 23 4.3 33 175 13 37 4 2 37 13 8 37 0 17 37 16 54 -1.15 29 0 0 36 34 17 14 23 7.7 34 176 13 36 29 46 36 38 48 36 26 2 36 42 33 -1.15 30 0 0 36 0 26 14 23 11.1 34 177 12 35 55 57 36 4 56 35 52 15 36 8 39 -1.15 31 0 0 35 27 4 14 23 14.5 35 178 12 35 22 36 35 31 31 35 18 56 35 35 13 -1.16 32 0 0 34 54 10 14 23 18.1 35 179 11 34 49 45 34 58 36 34 46 5 35 2 17 -1.16 33 0 0 34 21 48 14 23 21.6 36 180 10 34 17 24 34 26 12 34 13 46 34 29 51 -1.16 34 0 0 33 49 57 14 23 25.2 36 182 10 33 45 35 33 54 20 33 41 59 33 57 57 -1.16 35 0 0 33 18 39 14 23 28.9 37 183 9 33 14 18 33 23 0 33 10 43 33 26 36 -1.16 36 0 0 32 47 53 14 23 32.5 37 184 8 32 43 35 32 52 13 32 40 1 32 55 47 -1.16 37 0 0 32 17 43 14 23 36.3 38 185 8 32 13 26 32 22 1 32 9 53 32 25 34 -1.16 38 0 0 31 48 7 14 23 40.0 38 187 7 31 43 52 31 52 23 31 40 21 31 55 55 -1.16 39 0 0 31 19 7 14 23 43.8 39 188 6 31 14 53 31 23 22 31 11 24 31 26 53 -1.16 40 0 0 30 50 44 14 23 47.6 39 189 5 30 46 31 30 54 57 30 43 3 30 58 27 -1.16 41 0 0 30 22 58 14 23 51.4 39 190 5 30 18 47 30 27 9 30 15 19 30 30 38 -1.16 42 0 0 29 55 49 14 23 55.3 39 192 4 29 51 40 29 59 59 29 48 14 30 3 26 -1.17 43 0 0 29 29 19 14 23 59.1 40 193 3 29 25 11 29 33 28 29 21 46 29 36 54 -1.17 44 0 0 29 3 28 14 24 3.0 40 194 2 28 59 21 29 7 35 28 55 57 29 11 0 -1.17 45 0 0 28 38 15 14 24 6.9 40 196 1 28 34 10 28 42 21 28 30 47 28 45 45 -1.17 46 0 0 28 13 43 14 24 10.8 40 197 1 28 9 39 28 17 48 28 6 17 28 21 10 -1.17 47 0 0 27 49 51 14 24 14.7 40 198 0 27 45 48 27 53 55 27 42 28 27 57 16 -1.17 48 0 0 27 26 40 14 24 18.6 40 199 -1 27 22 38 27 30 42 27 19 18 27 34 2 -1.17 49 0 0 27 4 9 14 24 22.5 40 201 -2 27 0 9 27 8 10 26 56 50 27 11 30 -1.17 50 0 0 26 42 20 14 24 26.4 40 202 -3 26 38 21 26 46 20 26 35 3 26 49 39 -1.17 51 0 0 26 21 13 14 24 30.3 40 203 -4 26 17 14 26 25 11 26 13 58 26 28 29 -1.17 52 0 0 26 0 47 14 24 34.2 40 205 -5 25 56 50 26 4 45 25 53 34 26 8 1 -1.17 53 0 0 25 41 4 14 24 38.0 40 206 -5 25 37 8 25 45 0 25 33 53 25 48 16 -1.17 54 0 0 25 22 3 14 24 41.9 40 207 -6 25 18 8 25 25 58 25 14 53 25 29 13 -1.17 55 0 0 25 3 44 14 24 45.7 40 208 -7 24 59 50 25 7 39 24 56 37 25 10 53 -1.17 56 0 0 24 46 9 14 24 49.5 40 210 -8 24 42 15 24 50 2 24 39 3 24 53 16 -1.17 57 0 0 24 29 16 14 24 53.3 40 211 -9 24 25 24 24 33 9 24 22 12 24 36 21 -1.18 58 0 0 24 13 7 14 24 57.1 39 212 -10 24 9 15 24 16 59 24 6 4 24 20 10 -1.18 59 0 0 23 57 41 14 25 0.8 39 213 -11 23 53 50 24 1 32 23 50 40 24 4 43 -1.18 60 0 0 23 42 58 14 25 4.5 39 214 -12 23 39 8 23 46 49 23 35 58 23 49 59 -1.18 61 0 0 23 28 59 14 25 8.2 38 215 -13 23 25 10 23 32 49 23 22 1 23 35 59 -1.18 62 0 0 23 15 44 14 25 11.8 38 216 -14 23 11 55 23 19 33 23 8 47 23 22 42 -1.18 63 0 0 23 3 12 14 25 15.5 38 218 -14 22 59 25 23 7 1 22 56 16 23 10 10 -1.18 64 0 0 22 51 25 14 25 19.0 37 219 -15 22 47 37 22 55 12 22 44 30 22 58 21 -1.18 65 0 0 22 40 21 14 25 22.5 37 220 -16 22 36 34 22 44 8 22 33 27 22 47 16 -1.18 66 0 0 22 30 1 14 25 26.0 36 221 -17 22 26 15 22 33 47 22 23 8 22 36 55 -1.18 67 0 0 22 20 25 14 25 29.5 36 222 -18 22 16 39 22 24 11 22 13 33 22 27 18 -1.18 68 0 0 22 11 33 14 25 32.9 35 223 -19 22 7 47 22 15 18 22 4 41 22 18 25 -1.18 69 0 0 22 3 25 14 25 36.2 35 223 -20 21 59 40 22 7 10 21 56 34 22 10 16 -1.18 70 0 0 21 56 1 14 25 39.5 34 224 -21 21 52 16 21 59 45 21 49 11 22 2 51 -1.18 71 0 0 21 49 21 14 25 42.8 34 225 -22 21 45 37 21 53 5 21 42 32 21 56 11 -1.18 72 0 0 21 43 25 14 25 46.0 33 226 -23 21 39 41 21 47 9 21 36 36 21 50 14 -1.18 73 0 0 21 38 13 14 25 49.1 32 227 -24 21 34 30 21 41 57 21 31 25 21 45 2 -1.18 74 0 0 21 33 45 14 25 52.2 32 228 -25 21 30 2 21 37 29 21 26 58 21 40 34 -1.18 75 0 0 21 30 1 14 25 55.2 31 229 -26 21 26 19 21 33 45 21 23 14 21 36 49 -1.18 76 0 0 21 27 2 14 25 58.2 30 229 -27 21 23 19 21 30 45 21 20 15 21 33 49 -1.18 77 0 0 21 24 46 14 26 1.1 30 230 -28 21 21 3 21 28 29 21 18 0 21 31 33 -1.18 78 0 0 21 23 14 14 26 3.9 29 231 -29 21 19 32 21 26 57 21 16 28 21 30 2 -1.18 79 0 0 21 22 27 14 26 6.7 28 231 -30 21 18 44 21 26 9 21 15 40 21 29 14 -1.18 80 0 0 21 22 23 14 26 9.4 28 232 -30 21 18 40 21 26 5 21 15 37 21 29 10 -1.18 81 0 0 21 23 3 14 26 12.0 27 233 -31 21 19 20 21 26 46 21 16 17 21 29 50 -1.18 82 0 0 21 24 27 14 26 14.6 26 233 -32 21 20 44 21 28 9 21 17 40 21 31 14 -1.18 83 0 0 21 26 34 14 26 17.1 25 234 -33 21 22 52 21 30 17 21 19 48 21 33 22 -1.19 84 0 0 21 29 26 14 26 19.5 24 235 -34 21 25 43 21 33 9 21 22 39 21 36 13 -1.19 85 0 0 21 33 1 14 26 21.9 24 235 -35 21 29 18 21 36 44 21 26 14 21 39 48 -1.19 86 0 0 21 37 19 14 26 24.2 23 236 -36 21 33 36 21 41 3 21 30 32 21 44 8 -1.19 87 0 0 21 42 22 14 26 26.4 22 236 -37 21 38 39 21 46 5 21 35 34 21 49 10 -1.19 88 0 0 21 48 8 14 26 28.5 21 237 -38 21 44 24 21 51 52 21 41 20 21 54 57 -1.19 89 0 0 21 54 37 14 26 30.5 20 237 -39 21 50 53 21 58 21 21 47 48 22 1 27 -1.19 90 0 0 22 1 50 14 26 32.5 19 238 -40 21 58 5 22 5 34 21 55 0 22 8 40 -1.19 91 0 0 22 9 46 14 26 34.4 19 238 -41 22 6 1 22 13 30 22 2 56 22 16 37 -1.19 92 0 0 22 18 25 14 26 36.2 18 239 -41 22 14 40 22 22 10 22 11 34 22 25 16 -1.19 93 0 0 22 27 47 14 26 37.9 17 239 -42 22 24 2 22 31 33 22 20 56 22 34 40 -1.19 94 0 0 22 37 53 14 26 39.6 16 240 -43 22 34 7 22 41 39 22 31 0 22 44 46 -1.19 95 0 0 22 48 41 14 26 41.1 15 240 -44 22 44 54 22 52 28 22 41 47 22 55 35 -1.19 96 0 0 23 0 12 14 26 42.6 14 241 -45 22 56 25 23 3 59 22 53 17 23 7 7 -1.19 97 0 0 23 12 25 14 26 43.9 13 241 -46 23 8 38 23 16 13 23 5 30 23 19 22 -1.20 98 0 0 23 25 22 14 26 45.2 12 242 -47 23 21 33 23 29 10 23 18 25 23 32 19 -1.20 99 0 0 23 39 0 14 26 46.4 11 242 -48 23 35 11 23 42 49 23 32 2 23 45 59 -1.20 100 0 0 23 53 21 14 26 47.5 10 243 -48 23 49 31 23 57 11 23 46 22 24 0 21 -1.20 101 0 0 24 8 24 14 26 48.5 10 243 -49 24 4 34 24 12 15 24 1 24 24 15 25 -1.21 102 0 0 24 24 9 14 26 49.5 9 244 -50 24 20 18 24 28 0 24 17 7 24 31 12 -1.21 103 0 0 24 40 35 14 26 50.3 8 244 -51 24 36 44 24 44 28 24 33 32 24 47 40 -1.22 104 0 0 24 57 44 14 26 51.0 7 244 -51 24 53 51 25 1 37 24 50 39 25 4 50 -1.22 105 0 0 25 15 33 14 26 51.7 6 245 -52 25 11 39 25 19 27 25 8 27 25 22 41 -1.23 106 0 0 25 34 4 14 26 52.2 5 245 -53 25 30 9 25 37 59 25 26 56 25 41 13 -1.24 107 0 0 25 53 15 14 26 52.6 4 246 -54 25 49 19 25 57 11 25 46 5 26 0 26 -1.26 108 0 0 26 13 7 14 26 53.0 3 246 -54 26 9 10 26 17 4 26 5 55 26 20 20 -1.29 109 0 0 26 33 39 14 26 53.2 2 247 -55 26 29 41 26 37 37 26 26 25 26 40 53 -1.35 110 0 0 26 54 51 14 26 53.4 1 247 -56 26 50 52 26 58 50 26 47 35 27 2 7 -1.53 111 0 0 27 16 42 14 26 53.4 0 248 -56 27 12 43 27 20 42 27 9 25 27 24 1 -7.86 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 351-120303 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 55 02.9765 DE: -19 51 51.831 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 55 02.9764 DE: -19 51 51.831 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (40316) 1999 LU4 asteroid class: approx. diameter [km]: 9 approx. diameter ["]: 0.006 distance from Earth [AU]: 2.13480 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#38 date of fit: 2023 Apr 25 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", 0.002", 116.231° remarks: * orbital elements for (40316)1999 LU4 : Mean anomaly = 312.9515085717 deg Arg. of pericenter = 243.0173705471 deg Long. of node = 125.3222621500 deg Inclination = 23.0790617232 deg Eccentricity = 0.2493117458 Semimajor axis = 2.3276084323 AU Perihelion dist = 1.7473083104 AU Mag: H = 14.08, G = 0.15 Epoch of elements : MJD 60594.60028870 TDT (2024 Oct 11.6003) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#382023Apr25,0.32,2024,10,11,14.406934,0.265188,0.711814,14.757545,-5.505410,0.005005,0.000085,-0.000001,0.000000 32.3553,-19.8692,-39.46,-7.35,False UCAC4 351-120303,17.91749350,-19.8643975,12.63,11.84,11.41,0.0,0,,17.94178781,-19.8692090,6.66,6.63,0,0,0 40316,1999 LU4,18.50,8.877,2.1348,0,0,4.310,-22.68,,0.8,0 0,312.7849,2024,10,11,243.0174,125.3223,23.0791,0.24931,2.32761,1.74731,14.08,5.0,0.15 1.413,0.0170,0.0017,116,0.0024,Known errors,0.86,0,-1,-1 20241011_120303,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org