IOTA/IOTA-ES occultation update for (169) Zelia / UCAC4 316-220154 event on 2024 Oct 15, 00:47 UT Visible from Summary ------- On 2024 Oct 15 UT, the 36.361 km diameter asteroid (169) Zelia will occult a 11.9 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 2.07 mag to 13.84 mag (the magnitude of the asteroid) for at most 1.490 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 15, 00:43 - 2024 Oct 15, 00:50 * geocentric midpoint of event [JD]: 2460598.53279942 * magnitude of target star: 11.94 * magnitude drop [mag]: 2.07 * estimated maximum duration [s]: 1.490 * Moon: 91 % sunlit, 64° distance * Sun: 81° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 46 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.003", 83°) * approx speed of asteroid's shadow [km/s]: 24.4355 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 316-220154 by 169 Zelia on 2024 Oct 15 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 172 0 0 22 35 42 0 43 48.2 1 119 58 22 21 28 22 49 58 22 17 50 22 53 38 .... 173 0 0 22 4 55 0 43 48.3 2 120 59 21 50 45 22 19 8 21 47 8 22 22 47 -0.38 174 0 0 21 34 35 0 43 48.5 3 120 59 21 20 29 21 48 44 21 16 53 21 52 23 -0.54 175 0 0 21 4 43 0 43 48.9 4 121 59 20 50 41 21 18 49 20 47 5 21 22 26 -0.61 176 0 0 20 35 20 0 43 49.3 5 121 59 20 21 21 20 49 22 20 17 46 20 52 58 -0.64 177 0 0 20 6 25 0 43 49.9 6 121 59 19 52 30 20 20 24 19 48 56 20 24 0 -0.67 178 0 0 19 38 1 0 43 50.5 7 122 59 19 24 8 19 51 56 19 20 35 19 55 31 -0.68 179 0 0 19 10 7 0 43 51.3 8 122 59 18 56 18 19 23 59 18 52 46 19 27 33 -0.70 -180 0 0 18 42 44 0 43 52.2 9 122 59 18 28 58 18 56 33 18 25 27 19 0 6 -0.71 -179 0 0 18 15 53 0 43 53.2 10 123 59 18 2 10 18 29 38 17 58 40 18 33 10 -0.71 -178 0 0 17 49 34 0 43 54.3 11 123 59 17 35 55 18 3 16 17 32 25 18 6 48 -0.72 -177 0 0 17 23 48 0 43 55.5 12 123 59 17 10 12 17 37 27 17 6 43 17 40 58 -0.72 -176 0 0 16 58 36 0 43 56.8 13 124 59 16 45 3 17 12 12 16 41 35 17 15 41 -0.73 -175 0 0 16 33 57 0 43 58.2 14 124 58 16 20 27 16 47 30 16 17 0 16 50 59 -0.73 -174 0 0 16 9 53 0 43 59.7 15 124 58 15 56 26 16 23 23 15 53 0 16 26 51 -0.74 -173 0 0 15 46 24 0 44 1.3 16 125 58 15 33 0 15 59 51 15 29 34 16 3 18 -0.74 -172 0 0 15 23 30 0 44 3.1 17 125 57 15 10 9 15 36 54 15 6 43 15 40 20 -0.74 -171 0 0 15 1 11 0 44 4.9 18 125 57 14 47 53 15 14 32 14 44 28 15 17 58 -0.74 -170 0 0 14 39 28 0 44 6.8 19 126 56 14 26 13 14 52 47 14 22 49 14 56 12 -0.75 -169 0 0 14 18 22 0 44 8.8 20 126 56 14 5 9 14 31 38 14 1 46 14 35 2 -0.75 -168 0 0 13 57 52 0 44 10.9 21 126 55 13 44 42 14 11 5 13 41 20 14 14 29 -0.75 -167 0 0 13 37 59 0 44 13.1 22 127 55 13 24 51 13 51 10 13 21 30 13 54 33 -0.75 -166 0 0 13 18 44 0 44 15.4 23 127 54 13 5 38 13 31 51 13 2 17 13 35 14 -0.75 -165 0 0 13 0 5 0 44 17.8 24 128 54 12 47 2 13 13 11 12 43 42 13 16 33 -0.75 -164 0 0 12 42 5 0 44 20.3 25 128 53 12 29 4 12 55 8 12 25 44 12 58 29 -0.76 -163 0 0 12 24 42 0 44 22.8 26 128 52 12 11 43 12 37 43 12 8 24 12 41 3 -0.76 -162 0 0 12 7 57 0 44 25.5 27 129 51 11 55 1 12 20 56 11 51 42 12 24 16 -0.76 -161 0 0 11 51 51 0 44 28.2 28 129 51 11 38 56 12 4 47 11 35 38 12 8 7 -0.76 -160 0 0 11 36 23 0 44 31.0 29 130 50 11 23 30 11 49 17 11 20 13 11 52 36 -0.76 -159 0 0 11 21 33 0 44 33.9 30 130 49 11 8 43 11 34 26 11 5 26 11 37 44 -0.76 -158 0 0 11 7 23 0 44 36.9 31 130 49 10 54 34 11 20 13 10 51 17 11 23 31 -0.76 -157 0 0 10 53 51 0 44 39.9 32 131 48 10 41 4 11 6 40 10 37 48 11 9 58 -0.76 -156 0 0 10 40 58 0 44 43.0 32 131 47 10 28 13 10 53 46 10 24 57 10 57 3 -0.76 -155 0 0 10 28 45 0 44 46.2 33 132 46 10 16 1 10 41 30 10 12 46 10 44 47 -0.77 -154 0 0 10 17 10 0 44 49.4 34 133 45 10 4 28 10 29 55 10 1 13 10 33 11 -0.77 -153 0 0 10 6 15 0 44 52.8 35 133 44 9 53 35 10 18 58 9 50 20 10 22 14 -0.77 -152 0 0 9 56 0 0 44 56.2 36 134 44 9 43 21 10 8 41 9 40 6 10 11 57 -0.77 -151 0 0 9 46 24 0 44 59.6 37 134 43 9 33 46 9 59 4 9 30 32 10 2 19 -0.77 -150 0 0 9 37 28 0 45 3.2 38 135 42 9 24 51 9 50 7 9 21 37 9 53 22 -0.77 -149 0 0 9 29 11 0 45 6.7 38 136 41 9 16 35 9 41 49 9 13 22 9 45 4 -0.77 -148 0 0 9 21 34 0 45 10.4 39 136 40 9 8 59 9 34 11 9 5 46 9 37 25 -0.77 -147 0 0 9 14 37 0 45 14.1 40 137 39 9 2 3 9 27 13 8 58 50 9 30 27 -0.77 -146 0 0 9 8 20 0 45 17.9 41 138 38 8 55 46 9 20 55 8 52 34 9 24 9 -0.77 -145 0 0 9 2 42 0 45 21.7 41 138 37 8 50 10 9 15 17 8 46 57 9 18 30 -0.77 -144 0 0 8 57 45 0 45 25.6 42 139 36 8 45 13 9 10 19 8 42 1 9 13 32 -0.77 -143 0 0 8 53 27 0 45 29.5 43 140 35 8 40 56 9 6 1 8 37 44 9 9 14 -0.77 -142 0 0 8 49 50 0 45 33.5 43 141 34 8 37 19 9 2 23 8 34 7 9 5 36 -0.77 -141 0 0 8 46 53 0 45 37.5 44 142 34 8 34 22 8 59 25 8 31 10 9 2 38 -0.77 -140 0 0 8 44 35 0 45 41.6 45 143 33 8 32 5 8 57 8 8 28 53 9 0 21 -0.77 -139 0 0 8 42 58 0 45 45.7 45 144 32 8 30 28 8 55 30 8 27 16 8 58 44 -0.78 -138 0 0 8 42 1 0 45 49.8 46 145 31 8 29 32 8 54 33 8 26 20 8 57 47 -0.78 -137 0 0 8 41 45 0 45 54.0 47 146 30 8 29 15 8 54 17 8 26 3 8 57 30 -0.78 -136 0 0 8 42 8 0 45 58.3 47 147 29 8 29 38 8 54 40 8 26 26 8 57 53 -0.78 -135 0 0 8 43 12 0 46 2.6 48 148 28 8 30 42 8 55 44 8 27 30 8 58 57 -0.78 -134 0 0 8 44 56 0 46 6.9 48 149 27 8 32 25 8 57 28 8 29 13 9 0 42 -0.78 -133 0 0 8 47 20 0 46 11.2 49 150 26 8 34 49 8 59 53 8 31 37 9 3 6 -0.78 -132 0 0 8 50 24 0 46 15.6 49 151 25 8 37 53 9 2 58 8 34 41 9 6 11 -0.78 -131 0 0 8 54 9 0 46 20.0 50 152 24 8 41 37 9 6 43 8 38 25 9 9 57 -0.78 -130 0 0 8 58 34 0 46 24.5 50 154 23 8 46 2 9 11 9 8 42 49 9 14 22 -0.78 -129 0 0 9 3 39 0 46 29.0 50 155 22 8 51 6 9 16 14 8 47 53 9 19 28 -0.78 -128 0 0 9 9 25 0 46 33.5 51 156 21 8 56 51 9 22 1 8 53 38 9 25 15 -0.78 -127 0 0 9 15 50 0 46 38.0 51 158 20 9 3 16 9 28 27 9 0 2 9 31 42 -0.78 -126 0 0 9 22 56 0 46 42.6 51 159 19 9 10 21 9 35 34 9 7 7 9 38 49 -0.78 -125 0 0 9 30 43 0 46 47.1 51 160 18 9 18 6 9 43 22 9 14 52 9 46 37 -0.78 -124 0 0 9 39 9 0 46 51.7 52 162 17 9 26 31 9 51 49 9 23 17 9 55 5 -0.78 -123 0 0 9 48 16 0 46 56.3 52 163 16 9 35 36 10 0 57 9 32 22 10 4 13 -0.78 -122 0 0 9 58 3 0 47 0.9 52 165 15 9 45 22 10 10 45 9 42 7 10 14 1 -0.78 -121 0 0 10 8 29 0 47 5.6 52 166 14 9 55 47 10 21 14 9 52 32 10 24 30 -0.78 -120 0 0 10 19 36 0 47 10.2 52 168 13 10 6 53 10 32 22 10 3 37 10 35 39 -0.78 -119 0 0 10 31 23 0 47 14.9 52 169 12 10 18 38 10 44 11 10 15 22 10 47 28 -0.78 -118 0 0 10 43 50 0 47 19.5 52 171 11 10 31 3 10 56 39 10 27 47 10 59 57 -0.78 -117 0 0 10 56 57 0 47 24.2 52 172 10 10 44 8 11 9 48 10 40 51 11 13 6 -0.78 -116 0 0 11 10 43 0 47 28.9 52 174 9 10 57 52 11 23 36 10 54 35 11 26 55 -0.78 -115 0 0 11 25 9 0 47 33.5 52 175 8 11 12 17 11 38 4 11 8 59 11 41 23 -0.78 -114 0 0 11 40 15 0 47 38.2 52 177 7 11 27 20 11 53 12 11 24 2 11 56 31 -0.78 -113 0 0 11 56 0 0 47 42.9 51 178 5 11 43 3 12 8 59 11 39 44 12 12 19 -0.78 -112 0 0 12 12 24 0 47 47.5 51 180 4 11 59 25 12 25 26 11 56 6 12 28 47 -0.78 -111 0 0 12 29 28 0 47 52.2 51 181 3 12 16 27 12 42 32 12 13 7 12 45 53 -0.78 -110 0 0 12 47 11 0 47 56.8 50 182 2 12 34 7 13 0 17 12 30 46 13 3 39 -0.78 -109 0 0 13 5 32 0 48 1.4 50 184 1 12 52 26 13 18 40 12 49 5 13 22 3 -0.78 -108 0 0 13 24 32 0 48 6.0 50 185 0 13 11 23 13 37 43 13 8 2 13 41 6 -0.78 -107 0 0 13 44 10 0 48 10.6 49 187 -1 13 30 59 13 57 24 13 27 37 14 0 48 -0.78 -106 0 0 14 4 27 0 48 15.1 49 188 -2 13 51 13 14 17 43 13 47 50 14 21 8 -0.78 -105 0 0 14 25 21 0 48 19.7 48 189 -3 14 12 5 14 38 40 14 8 41 14 42 6 -0.78 -104 0 0 14 46 53 0 48 24.2 48 190 -4 14 33 34 15 0 15 14 30 9 15 3 41 -0.78 -103 0 0 15 9 3 0 48 28.7 47 192 -5 14 55 40 15 22 28 14 52 15 15 25 54 -0.78 -102 0 0 15 31 49 0 48 33.1 47 193 -6 15 18 24 15 45 17 15 14 58 15 48 44 -0.78 -101 0 0 15 55 12 0 48 37.5 46 194 -7 15 41 44 16 8 43 15 38 17 16 12 11 -0.78 -100 0 0 16 19 11 0 48 41.9 45 195 -8 16 5 40 16 32 45 16 2 12 16 36 14 -0.78 - 99 0 0 16 43 46 0 48 46.2 45 196 -9 16 30 11 16 57 23 16 26 43 17 0 53 -0.78 - 98 0 0 17 8 56 0 48 50.5 44 197 -10 16 55 18 17 22 37 16 51 49 17 26 7 -0.78 - 97 0 0 17 34 41 0 48 54.7 43 198 -11 17 21 0 17 48 25 17 17 30 17 51 57 -0.78 - 96 0 0 18 1 1 0 48 58.9 43 200 -12 17 47 17 18 14 48 17 43 46 18 18 21 -0.78 - 95 0 0 18 27 55 0 49 3.1 42 201 -13 18 14 7 18 41 45 18 10 36 18 45 19 -0.78 - 94 0 0 18 55 22 0 49 7.2 41 202 -14 18 41 31 19 9 16 18 37 58 19 12 50 -0.78 - 93 0 0 19 23 21 0 49 11.2 40 202 -15 19 9 27 19 37 19 19 5 53 19 40 54 -0.78 - 92 0 0 19 51 53 0 49 15.1 40 203 -16 19 37 55 20 5 54 19 34 21 20 9 30 -0.78 - 91 0 0 20 20 56 0 49 19.0 39 204 -17 20 6 55 20 35 1 20 3 19 20 38 38 -0.78 - 90 0 0 20 50 30 0 49 22.9 38 205 -18 20 36 25 21 4 38 20 32 49 21 8 16 -0.78 - 89 0 0 21 20 33 0 49 26.6 37 206 -19 21 6 25 21 34 45 21 2 48 21 38 24 -0.78 - 88 0 0 21 51 6 0 49 30.3 36 207 -20 21 36 54 22 5 21 21 33 16 22 9 1 -0.78 - 87 0 0 22 22 7 0 49 33.9 35 208 -21 22 7 51 22 36 26 22 4 12 22 40 7 -0.78 - 86 0 0 22 53 36 0 49 37.5 34 208 -22 22 39 16 23 7 59 22 35 37 23 11 40 -0.78 - 85 0 0 23 25 31 0 49 40.9 33 209 -23 23 11 8 23 39 58 23 7 27 23 43 40 -0.78 - 84 0 0 23 57 52 0 49 44.3 33 210 -24 23 43 25 24 12 22 23 39 44 24 16 6 -0.78 - 83 0 0 24 30 37 0 49 47.6 32 211 -24 24 16 7 24 45 11 24 12 24 24 48 56 -0.78 - 82 0 0 25 3 46 0 49 50.8 31 211 -25 24 49 12 25 18 24 24 45 29 25 22 9 -0.78 - 81 0 0 25 37 18 0 49 53.9 30 212 -26 25 22 41 25 51 59 25 18 56 25 55 46 -0.78 - 80 0 0 26 11 11 0 49 56.9 29 213 -27 25 56 30 26 25 56 25 52 45 26 29 43 -0.78 - 79 0 0 26 45 25 0 49 59.8 28 214 -28 26 30 40 27 0 13 26 26 54 27 4 2 -0.78 - 78 0 0 27 19 58 0 50 2.6 27 214 -29 27 5 10 27 34 50 27 1 23 27 38 39 -0.78 - 77 0 0 27 54 49 0 50 5.4 26 215 -30 27 39 57 28 9 44 27 36 9 28 13 34 -0.78 - 76 0 0 28 29 57 0 50 8.0 25 216 -30 28 15 2 28 44 56 28 11 13 28 48 47 -0.78 - 75 0 0 29 5 20 0 50 10.5 24 216 -31 28 50 22 29 20 22 28 46 32 29 24 14 -0.78 - 74 0 0 29 40 58 0 50 12.9 23 217 -32 29 25 56 29 56 3 29 22 5 29 59 56 -0.78 - 73 0 0 30 16 48 0 50 15.2 22 218 -33 30 1 43 30 31 57 29 57 52 30 35 51 -0.78 - 72 0 0 30 52 51 0 50 17.4 21 218 -34 30 37 42 31 8 3 30 33 50 31 11 57 -0.78 - 71 0 0 31 29 3 0 50 19.5 20 219 -34 31 13 52 31 44 19 31 9 58 31 48 14 -0.78 - 70 0 0 32 5 25 0 50 21.5 19 219 -35 31 50 10 32 20 43 31 46 16 32 24 39 -0.78 - 69 0 0 32 41 53 0 50 23.4 18 220 -36 32 26 36 32 57 15 32 22 41 33 1 12 -0.78 - 68 0 0 33 18 29 0 50 25.2 17 221 -36 33 3 8 33 33 53 32 59 13 33 37 51 -0.78 - 67 0 0 33 55 8 0 50 26.9 16 221 -37 33 39 45 34 10 36 33 35 49 34 14 34 -0.78 - 66 0 0 34 31 51 0 50 28.4 15 222 -38 34 16 26 34 47 21 34 12 29 34 51 20 -0.78 - 65 0 0 35 8 36 0 50 29.9 14 223 -38 34 53 8 35 24 9 34 49 11 35 28 9 -0.78 - 64 0 0 35 45 22 0 50 31.2 13 223 -39 35 29 51 36 0 57 35 25 53 36 4 57 -0.78 - 63 0 0 36 22 6 0 50 32.5 12 224 -39 36 6 33 36 37 43 36 2 34 36 41 44 -0.78 - 62 0 0 36 58 48 0 50 33.6 11 224 -40 36 43 13 37 14 28 36 39 14 37 18 29 -0.78 - 61 0 0 37 35 26 0 50 34.6 10 225 -40 37 19 49 37 51 8 37 15 49 37 55 10 -0.79 - 60 0 0 38 11 59 0 50 35.5 9 226 -41 37 56 20 38 27 43 37 52 20 38 31 45 -0.79 - 59 0 0 38 48 25 0 50 36.3 8 226 -41 38 32 44 39 4 11 38 28 44 39 8 14 -0.79 - 58 0 0 39 24 44 0 50 37.0 7 227 -42 39 9 1 39 40 30 39 5 0 39 44 34 -0.79 - 57 0 0 40 0 53 0 50 37.6 6 228 -42 39 45 9 40 16 41 39 41 7 40 20 45 -0.79 - 56 0 0 40 36 51 0 50 38.1 5 228 -42 40 21 6 40 52 40 40 17 4 40 56 45 -0.80 - 55 0 0 41 12 37 0 50 38.6 4 229 -43 40 56 51 41 28 28 40 52 49 41 32 32 -0.81 - 54 0 0 41 48 10 0 50 38.9 3 230 -43 41 32 23 42 4 2 41 28 21 42 8 6 -0.82 - 53 0 0 42 23 29 0 50 39.1 2 230 -43 42 7 41 42 39 21 42 3 38 42 43 26 -0.84 - 52 0 0 42 58 32 0 50 39.2 1 231 -44 42 42 43 43 14 25 42 38 40 43 18 30 -0.90 - 51 0 0 43 33 18 0 50 39.3 0 232 -44 43 17 29 .. .. .. 43 13 26 .. .. .. -2.42 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 316-220154 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 55 46.4182 DE: -26 48 57.463 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 55 46.4182 DE: -26 48 57.463 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (169) Zelia asteroid class: approx. diameter [km]: 36 approx. diameter ["]: 0.025 distance from Earth [AU]: 1.97610 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 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): 0.022", 0.003", 83.078° remarks: * orbital elements for (169)Zelia : Mean anomaly = 345.6947029064 deg Arg. of pericenter = 334.8141143678 deg Long. of node = 354.7188419637 deg Inclination = 5.5001000957 deg Eccentricity = 0.1302098225 Semimajor axis = 2.3582937472 AU Perihelion dist = 2.0512207371 AU Mag: H = 9.53, G = 0.15 Epoch of elements : MJD 60598.03279942 TDT (2024 Oct 15.0328) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,1.49,2024,10,15,0.787186,-0.131505,0.600500,13.473678,2.946483,0.005250,0.000459,0.000000,0.000000 -111.5315,-26.7854,164.64,-8.63,False UCAC4 316-220154,18.92956066,-26.8159618,12.66,11.94,11.55,0.0,0,,18.95513376,-26.7854018,2.07,2.02,0,0,0 169,Zelia,13.84,36.361,1.9761,0,0,4.478,13.11,,2.2,0 0,345.4136,2024,10,14,334.8141,354.7188,5.5001,0.13021,2.35829,2.05122,9.53,5.0,0.15 1.128,0.0220,0.0025,83,0.0033,Known errors,0.90,0,-1,-1 20241015_220154,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org