IOTA/IOTA-ES occultation update for (169) Zelia / UCAC4 305-188600 event on 2024 Sep 12, 20:41 UT Visible from Summary ------- On 2024 Sep 12 UT, the 36.349 km diameter asteroid (169) Zelia 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 1.83 mag to 13.45 mag (the magnitude of the asteroid) for at most 2.660 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 Sep 12, 20:34 - 2024 Sep 12, 20:48 * geocentric midpoint of event [JD]: 2460566.36210079 * magnitude of target star: 11.84 * magnitude drop [mag]: 1.83 * estimated maximum duration [s]: 2.660 * Moon: 66 % sunlit, 8° distance * Sun: 101° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.003", 90°) * approx speed of asteroid's shadow [km/s]: 13.6612 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 305-188600 by 169 Zelia on 2024 Sep 12 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 -108 0 0 17 45 42 20 35 0.9 1 121 65 17 31 57 17 59 30 17 26 7 18 5 23 .... -107 0 0 17 11 59 20 35 1.1 2 121 64 16 58 18 17 25 43 16 52 29 17 31 35 -0.36 -106 0 0 16 38 47 20 35 1.6 3 122 63 16 25 9 16 52 27 16 19 22 16 58 17 -0.48 -105 0 0 16 6 4 20 35 2.3 4 122 63 15 52 30 16 19 41 15 46 45 16 25 29 -0.53 -104 0 0 15 33 54 20 35 3.1 5 122 62 15 20 23 15 47 27 15 14 39 15 53 14 -0.56 -103 0 0 15 2 16 20 35 4.2 6 122 61 14 48 48 15 15 45 14 43 6 15 21 30 -0.58 -102 0 0 14 31 10 20 35 5.5 7 123 61 14 17 47 14 44 36 14 12 6 14 50 20 -0.59 -101 0 0 14 0 39 20 35 7.0 8 123 60 13 47 19 14 14 2 13 41 39 14 19 44 -0.60 -100 0 0 13 30 42 20 35 8.7 10 123 59 13 17 25 13 44 1 13 11 47 13 49 42 -0.61 - 99 0 0 13 1 21 20 35 10.6 11 123 58 12 48 7 13 14 36 12 42 30 13 20 16 -0.62 - 98 0 0 12 32 35 20 35 12.6 12 124 57 12 19 25 12 45 47 12 13 49 12 51 25 -0.62 - 97 0 0 12 4 25 20 35 14.9 13 124 56 11 51 18 12 17 34 11 45 44 12 23 10 -0.63 - 96 0 0 11 36 52 20 35 17.4 14 124 56 11 23 49 11 49 58 11 18 16 11 55 33 -0.63 - 95 0 0 11 9 57 20 35 20.1 15 124 55 10 56 56 11 22 59 10 51 25 11 28 33 -0.64 - 94 0 0 10 43 39 20 35 22.9 16 125 54 10 30 42 10 56 39 10 25 12 11 2 11 -0.64 - 93 0 0 10 18 0 20 35 26.0 17 125 53 10 5 6 10 30 56 9 59 37 10 36 27 -0.64 - 92 0 0 9 52 59 20 35 29.2 18 125 52 9 40 8 10 5 52 9 34 40 10 11 22 -0.65 - 91 0 0 9 28 37 20 35 32.6 19 125 51 9 15 49 9 41 28 9 10 23 9 46 56 -0.65 - 90 0 0 9 4 55 20 35 36.2 20 126 50 8 52 10 9 17 43 8 46 45 9 23 10 -0.65 - 89 0 0 8 41 53 20 35 40.0 21 126 49 8 29 10 8 54 37 8 23 46 9 0 3 -0.65 - 88 0 0 8 19 30 20 35 43.9 22 126 48 8 6 50 8 32 12 8 1 27 8 37 37 -0.65 - 87 0 0 7 57 48 20 35 48.0 23 127 47 7 45 10 8 10 27 7 39 49 8 15 51 -0.66 - 86 0 0 7 36 46 20 35 52.2 24 127 46 7 24 11 7 49 23 7 18 51 7 54 45 -0.66 - 85 0 0 7 16 25 20 35 56.6 25 127 45 7 3 53 7 28 59 6 58 33 7 34 21 -0.66 - 84 0 0 6 56 45 20 36 1.2 26 127 44 6 44 15 7 9 17 6 38 57 7 14 37 -0.66 - 83 0 0 6 37 46 20 36 6.0 27 128 43 6 25 19 6 50 16 6 20 2 6 55 35 -0.66 - 82 0 0 6 19 29 20 36 10.8 28 128 42 6 7 4 6 31 56 6 1 48 6 37 15 -0.66 - 81 0 0 6 1 53 20 36 15.9 29 128 41 5 49 30 6 14 18 5 44 15 6 19 36 -0.66 - 80 0 0 5 44 59 20 36 21.0 30 129 40 5 32 39 5 57 22 5 27 24 6 2 39 -0.67 - 79 0 0 5 28 47 20 36 26.4 31 129 39 5 16 28 5 41 8 5 11 15 5 46 24 -0.67 - 78 0 0 5 13 17 20 36 31.8 32 129 38 5 1 0 5 25 36 4 55 47 5 30 51 -0.67 - 77 0 0 4 58 29 20 36 37.4 33 130 37 4 46 14 5 10 46 4 41 2 5 16 0 -0.67 - 76 0 0 4 44 23 20 36 43.1 34 130 36 4 32 10 4 56 38 4 26 58 5 1 52 -0.67 - 75 0 0 4 31 0 20 36 49.0 35 131 35 4 18 48 4 43 13 4 13 37 4 48 26 -0.67 - 74 0 0 4 18 19 20 36 55.0 36 131 34 4 6 8 4 30 30 4 0 58 4 35 42 -0.67 - 73 0 0 4 6 20 20 37 1.1 37 132 33 3 54 12 4 18 30 3 49 2 4 23 42 -0.67 - 72 0 0 3 55 4 20 37 7.3 38 132 32 3 42 57 4 7 13 3 37 48 4 12 24 -0.67 - 71 0 0 3 44 31 20 37 13.6 39 133 31 3 32 25 3 56 38 3 27 16 4 1 48 -0.67 - 70 0 0 3 34 40 20 37 20.1 39 133 30 3 22 35 3 46 46 3 17 27 3 51 56 -0.68 - 69 0 0 3 25 32 20 37 26.6 40 134 29 3 13 28 3 37 37 3 8 21 3 42 46 -0.68 - 68 0 0 3 17 6 20 37 33.3 41 134 28 3 5 4 3 29 10 2 59 57 3 34 19 -0.68 - 67 0 0 3 9 24 20 37 40.1 42 135 27 2 57 22 3 21 27 2 52 16 3 26 35 -0.68 - 66 0 0 3 2 24 20 37 47.0 43 135 26 2 50 23 3 14 26 2 45 17 3 19 34 -0.68 - 65 0 0 2 56 7 20 37 53.9 44 136 25 2 44 7 3 8 9 2 39 2 3 13 16 -0.68 - 64 0 0 2 50 33 20 38 1.0 44 137 24 2 38 34 3 2 34 2 33 29 3 7 41 -0.68 - 63 0 0 2 45 42 20 38 8.2 45 138 23 2 33 44 2 57 43 2 28 39 3 2 50 -0.68 - 62 0 0 2 41 34 20 38 15.5 46 138 22 2 29 36 2 53 34 2 24 31 2 58 41 -0.68 - 61 0 0 2 38 10 20 38 22.8 47 139 21 2 26 12 2 50 9 2 21 7 2 55 16 -0.68 - 60 0 0 2 35 28 20 38 30.2 47 140 19 2 23 31 2 47 27 2 18 26 2 52 34 -0.68 - 59 0 0 2 33 29 20 38 37.8 48 141 18 2 21 32 2 45 28 2 16 28 2 50 35 -0.68 - 58 0 0 2 32 14 20 38 45.4 49 142 17 2 20 17 2 44 13 2 15 12 2 49 19 -0.68 - 57 0 0 2 31 42 20 38 53.0 49 143 16 2 19 45 2 43 41 2 14 40 2 48 47 -0.68 - 56 0 0 2 31 53 20 39 0.8 50 144 15 2 19 56 2 43 52 2 14 51 2 48 58 -0.68 - 55 0 0 2 32 47 20 39 8.6 50 145 14 2 20 50 2 44 46 2 15 45 2 49 53 -0.68 - 54 0 0 2 34 25 20 39 16.5 51 146 13 2 22 27 2 46 25 2 17 23 2 51 31 -0.68 - 53 0 0 2 36 46 20 39 24.5 51 147 12 2 24 48 2 48 46 2 19 43 2 53 53 -0.68 - 52 0 0 2 39 51 20 39 32.5 52 148 11 2 27 52 2 51 51 2 22 47 2 56 58 -0.69 - 51 0 0 2 43 39 20 39 40.6 52 150 10 2 31 39 2 55 39 2 26 34 3 0 46 -0.69 - 50 0 0 2 48 10 20 39 48.7 53 151 9 2 36 10 3 0 11 2 31 5 3 5 19 -0.69 - 49 0 0 2 53 25 20 39 56.9 53 152 8 2 41 24 3 5 27 2 36 18 3 10 35 -0.69 - 48 0 0 2 59 23 20 40 5.2 54 154 7 2 47 22 3 11 26 2 42 16 3 16 35 -0.69 - 47 0 0 3 6 5 20 40 13.5 54 155 6 2 54 3 3 18 9 2 48 56 3 23 18 -0.69 - 46 0 0 3 13 31 20 40 21.8 54 156 5 3 1 28 3 25 36 2 56 21 3 30 45 -0.69 - 45 0 0 3 21 40 20 40 30.2 55 158 4 3 9 36 3 33 47 3 4 28 3 38 56 -0.69 - 44 0 0 3 30 34 20 40 38.6 55 159 3 3 18 28 3 42 41 3 13 20 3 47 51 -0.69 - 43 0 0 3 40 10 20 40 47.1 55 161 2 3 28 3 3 52 19 3 22 54 3 57 30 -0.69 - 42 0 0 3 50 31 20 40 55.6 55 162 1 3 38 22 4 2 41 3 33 13 4 7 52 -0.69 - 41 0 0 4 1 35 20 41 4.1 55 164 0 3 49 25 4 13 47 3 44 15 4 18 59 -0.69 - 40 0 0 4 13 23 20 41 12.7 55 166 -1 4 1 11 4 25 37 3 56 1 4 30 49 -0.69 - 39 0 0 4 25 55 20 41 21.3 56 167 -2 4 13 42 4 38 10 4 8 30 4 43 24 -0.69 - 38 0 0 4 39 11 20 41 29.9 56 169 -3 4 26 55 4 51 28 4 21 43 4 56 42 -0.69 - 37 0 0 4 53 10 20 41 38.5 55 170 -4 4 40 53 5 5 29 4 35 40 5 10 44 -0.69 - 36 0 0 5 7 53 20 41 47.1 55 172 -5 4 55 34 5 20 14 4 50 20 5 25 30 -0.69 - 35 0 0 5 23 20 20 41 55.8 55 174 -6 5 10 59 5 35 43 5 5 44 5 41 0 -0.69 - 34 0 0 5 39 31 20 42 4.4 55 175 -7 5 27 7 5 51 56 5 21 52 5 57 14 -0.69 - 33 0 0 5 56 25 20 42 13.1 55 177 -8 5 43 59 6 8 53 5 38 43 6 14 11 -0.69 - 32 0 0 6 14 3 20 42 21.7 55 178 -9 6 1 35 6 26 33 5 56 17 6 31 53 -0.69 - 31 0 0 6 32 24 20 42 30.4 54 180 -10 6 19 54 6 44 57 6 14 35 6 50 17 -0.69 - 30 0 0 6 51 29 20 42 39.0 54 182 -11 6 38 56 7 4 4 6 33 36 7 9 26 -0.69 - 29 0 0 7 11 17 20 42 47.6 54 183 -12 6 58 41 7 23 55 6 53 20 7 29 18 -0.69 - 28 0 0 7 31 48 20 42 56.2 53 185 -13 7 19 10 7 44 29 7 13 48 7 49 53 -0.69 - 27 0 0 7 53 2 20 43 4.8 53 186 -14 7 40 21 8 5 45 7 34 58 8 11 11 -0.68 - 26 0 0 8 14 59 20 43 13.3 52 187 -15 8 2 15 8 27 45 7 56 51 8 33 12 -0.68 - 25 0 0 8 37 39 20 43 21.8 52 189 -16 8 24 52 8 50 28 8 19 26 8 55 56 -0.68 - 24 0 0 9 1 1 20 43 30.3 51 190 -17 8 48 11 9 13 53 8 42 44 9 19 22 -0.68 - 23 0 0 9 25 5 20 43 38.7 51 191 -18 9 12 11 9 38 0 9 6 43 9 43 30 -0.68 - 22 0 0 9 49 50 20 43 47.1 50 193 -19 9 36 54 10 2 49 9 31 24 10 8 21 -0.68 - 21 0 0 10 15 18 20 43 55.4 49 194 -20 10 2 18 10 28 19 9 56 47 10 33 53 -0.68 - 20 0 0 10 41 26 20 44 3.6 49 195 -21 10 28 23 10 54 31 10 22 51 11 0 6 -0.68 - 19 0 0 11 8 15 20 44 11.8 48 196 -22 10 55 9 11 21 24 10 49 35 11 27 0 -0.68 - 18 0 0 11 35 45 20 44 19.9 47 197 -23 11 22 35 11 48 57 11 17 0 11 54 34 -0.68 - 17 0 0 12 3 54 20 44 28.0 47 199 -24 11 50 41 12 17 10 11 45 5 12 22 49 -0.68 - 16 0 0 12 32 43 20 44 35.9 46 200 -25 12 19 27 12 46 2 12 13 48 12 51 43 -0.68 - 15 0 0 13 2 11 20 44 43.8 45 201 -25 12 48 51 13 15 34 12 43 11 13 21 16 -0.68 - 14 0 0 13 32 17 20 44 51.6 44 202 -26 13 18 53 13 45 43 13 13 12 13 51 27 -0.68 - 13 0 0 14 3 1 20 44 59.2 43 203 -27 13 49 33 14 16 31 13 43 50 14 22 16 -0.68 - 12 0 0 14 34 22 20 45 6.8 42 203 -28 14 20 50 14 47 55 14 15 6 14 53 42 -0.68 - 11 0 0 15 6 19 20 45 14.3 42 204 -29 14 52 44 15 19 56 14 46 58 15 25 45 -0.68 - 10 0 0 15 38 51 20 45 21.6 41 205 -30 15 25 12 15 52 33 15 19 25 15 58 23 -0.68 - 9 0 0 16 11 58 20 45 28.8 40 206 -31 15 58 16 16 25 44 15 52 27 16 31 36 -0.68 - 8 0 0 16 45 40 20 45 35.9 39 207 -31 16 31 53 16 59 29 16 26 2 17 5 22 -0.68 - 7 0 0 17 19 54 20 45 42.8 38 208 -32 17 6 3 17 33 47 17 0 11 17 39 42 -0.68 - 6 0 0 17 54 40 20 45 49.7 37 208 -33 17 40 45 18 8 37 17 34 51 18 14 33 -0.68 - 5 0 0 18 29 57 20 45 56.3 36 209 -34 18 15 59 18 43 57 18 10 3 18 49 56 -0.68 - 4 0 0 19 5 44 20 46 2.8 35 210 -34 18 51 42 19 19 48 18 45 44 19 25 48 -0.68 - 3 0 0 19 41 59 20 46 9.2 34 211 -35 19 27 54 19 56 8 19 21 55 20 2 10 -0.68 - 2 0 0 20 18 43 20 46 15.3 33 211 -36 20 4 33 20 32 55 19 58 32 20 38 59 -0.68 - 1 0 0 20 55 52 20 46 21.4 32 212 -37 20 41 39 21 10 9 20 35 37 21 16 14 -0.68 0 0 0 21 33 27 20 46 27.2 31 213 -37 21 19 10 21 47 48 21 13 6 21 53 54 -0.68 1 0 0 22 11 26 20 46 32.9 30 213 -38 21 57 5 22 25 50 21 51 0 22 31 59 -0.68 2 0 0 22 49 48 20 46 38.3 29 214 -38 22 35 23 23 4 15 22 29 16 23 10 25 -0.67 3 0 0 23 28 30 20 46 43.6 28 215 -39 23 14 2 23 43 1 23 7 53 23 49 13 -0.67 4 0 0 24 7 32 20 46 48.7 27 215 -40 23 53 0 24 22 7 23 46 50 24 28 20 -0.67 5 0 0 24 46 52 20 46 53.6 25 216 -40 24 32 17 25 1 31 24 26 5 25 7 46 -0.67 6 0 0 25 26 29 20 46 58.4 24 216 -41 25 11 50 25 41 12 25 5 37 25 47 28 -0.67 7 0 0 26 6 22 20 47 2.9 23 217 -41 25 51 39 26 21 7 25 45 25 26 27 25 -0.67 8 0 0 26 46 27 20 47 7.2 22 218 -41 26 31 42 27 1 16 26 25 26 27 7 36 -0.67 9 0 0 27 26 45 20 47 11.3 21 218 -42 27 11 56 27 41 37 27 5 39 27 47 58 -0.67 10 0 0 28 7 13 20 47 15.1 20 219 -42 27 52 21 28 22 8 27 46 2 28 28 30 -0.67 11 0 0 28 47 50 20 47 18.8 19 219 -42 28 32 54 29 2 48 28 26 34 29 9 11 -0.67 12 0 0 29 28 33 20 47 22.3 18 220 -43 29 13 35 29 43 34 29 7 14 29 49 59 -0.68 13 0 0 30 9 22 20 47 25.5 17 220 -43 29 54 21 30 24 26 29 47 58 30 30 52 -0.68 14 0 0 30 50 14 20 47 28.6 16 221 -43 30 35 10 31 5 21 30 28 47 31 11 48 -0.68 15 0 0 31 31 8 20 47 31.4 15 222 -43 31 16 2 31 46 18 31 9 37 31 52 46 -0.68 16 0 0 32 12 2 20 47 34.0 14 222 -44 31 56 54 32 27 14 31 50 28 32 33 43 -0.68 17 0 0 32 52 55 20 47 36.4 12 223 -44 32 37 44 33 8 9 32 31 18 33 14 39 -0.68 18 0 0 33 33 44 20 47 38.6 11 223 -44 33 18 31 33 49 1 33 12 4 33 55 32 -0.68 19 0 0 34 14 29 20 47 40.6 10 224 -44 33 59 14 34 29 47 33 52 46 34 36 19 -0.68 20 0 0 34 55 7 20 47 42.4 9 224 -44 34 39 50 35 10 27 34 33 21 35 17 0 -0.68 21 0 0 35 35 36 20 47 44.0 8 225 -44 35 20 18 35 50 58 35 13 48 35 57 32 -0.68 22 0 0 36 15 56 20 47 45.3 7 226 -44 36 0 36 36 31 19 35 54 6 36 37 53 -0.68 23 0 0 36 56 4 20 47 46.5 6 226 -44 36 40 42 37 11 28 36 34 12 37 18 3 -0.69 24 0 0 37 35 58 20 47 47.5 5 227 -44 37 20 36 37 51 24 37 14 5 37 57 59 -0.69 25 0 0 38 15 39 20 47 48.3 4 228 -43 38 0 15 38 31 6 37 53 44 38 37 41 -0.70 26 0 0 38 55 3 20 47 48.9 3 228 -43 38 39 39 39 10 31 38 33 7 39 17 7 -0.70 27 0 0 39 34 10 20 47 49.3 2 229 -43 39 18 46 39 49 39 39 12 13 39 56 15 -0.72 28 0 0 40 12 58 20 47 49.5 1 229 -43 39 57 33 40 28 27 39 51 1 40 35 4 -0.77 29 0 0 .. .. .... .. .. .. .. .. .. 40 36 1 .. .. .. 40 29 29 .. .. .. .... Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 305-188600 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 06 11.6496 DE: -29 09 36.189 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 06 11.6495 DE: -29 09 36.189 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (169) Zelia asteroid class: approx. diameter [km]: 36 approx. diameter ["]: 0.031 distance from Earth [AU]: 1.64100 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): 0.026", 0.003", 89.803° remarks: * orbital elements for (169)Zelia : Mean anomaly = 336.9439418037 deg Arg. of pericenter = 334.8090827079 deg Long. of node = 354.7193835294 deg Inclination = 5.5000556263 deg Eccentricity = 0.1302301710 Semimajor axis = 2.3583542858 AU Perihelion dist = 2.0512254038 AU Mag: H = 9.53, G = 0.15 Epoch of elements : MJD 60565.86210046 TDT (2024 Sep 12.8621) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,2.66,2024,9,12,20.690419,-0.134474,0.549925,7.490497,1.829777,0.005174,0.000172,0.000000,0.000000 -30.7559,-29.1590,-131.36,3.74,False UCAC4 305-188600,18.10323602,-29.1600525,12.52,11.84,11.47,0.0,0,,18.12948614,-29.1590383,1.83,1.77,0,0,1 169,Zelia,13.45,36.349,1.6410,0,0,3.066,9.81,,2.2,0 0,336.7093,2024,9,12,334.8091,354.7194,5.5001,0.13023,2.35835,2.05123,9.53,5.0,0.15 1.213,0.0257,0.0026,90,0.0065,Known errors,0.63,0,-1,-1 20240912_188600,60140.56 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org