IOTA/IOTA-ES occultation update for (974) Lioba / UCAC4 321-134814 event on 2024 Oct 12, 13:29 UT Visible from Summary ------- On 2024 Oct 12 UT, the 24.838 km diameter asteroid (974) Lioba will occult a 11.7 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 4.03 mag to 15.66 mag (the magnitude of the asteroid) for at most 0.960 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 12, 13:26 - 2024 Oct 12, 13:32 * geocentric midpoint of event [JD]: 2460596.06204346 * magnitude of target star: 11.66 * magnitude drop [mag]: 4.03 * estimated maximum duration [s]: 0.960 * Moon: 70 % sunlit, 41° distance * Sun: 72° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 32 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.002", 100°) * approx speed of asteroid's shadow [km/s]: 25.9302 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 321-134814 by 974 Lioba on 2024 Oct 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 - 20 0 0 35 10 58 13 26 11.0 1 123 47 35 0 43 35 21 14 34 56 21 35 25 39 .... - 19 0 0 34 39 58 13 26 11.1 2 123 47 34 29 45 34 50 12 34 25 22 34 54 37 -0.45 - 18 0 0 34 9 2 13 26 11.3 3 124 48 33 58 51 34 19 15 33 54 29 34 23 39 -0.58 - 17 0 0 33 38 12 13 26 11.6 4 124 48 33 28 2 33 48 24 33 23 41 33 52 47 -0.64 - 16 0 0 33 7 29 13 26 12.0 5 125 48 32 57 20 33 17 39 32 53 0 33 22 1 -0.68 - 15 0 0 32 36 53 13 26 12.5 6 125 49 32 26 47 32 47 2 32 22 27 32 51 23 -0.70 - 14 0 0 32 6 27 13 26 13.0 7 126 49 31 56 21 32 16 33 31 52 3 32 20 54 -0.72 - 13 0 0 31 36 9 13 26 13.7 8 127 49 31 26 6 31 46 14 31 21 48 31 50 34 -0.73 - 12 0 0 31 6 3 13 26 14.5 9 127 49 30 56 1 31 16 6 30 51 44 31 20 26 -0.74 - 11 0 0 30 36 9 13 26 15.3 10 128 50 30 26 9 30 46 10 30 21 52 30 50 29 -0.75 - 10 0 0 30 6 27 13 26 16.3 11 128 50 29 56 29 30 16 26 29 52 13 30 20 44 -0.76 - 9 0 0 29 36 59 13 26 17.3 12 129 50 29 27 2 29 46 56 29 22 47 29 51 13 -0.76 - 8 0 0 29 7 45 13 26 18.5 12 129 50 28 57 51 29 17 41 28 53 36 29 21 57 -0.77 - 7 0 0 28 38 47 13 26 19.7 13 130 50 28 28 55 28 48 42 28 24 41 28 52 57 -0.77 - 6 0 0 28 10 6 13 26 21.1 14 130 50 28 0 15 28 19 58 27 56 2 28 24 13 -0.77 - 5 0 0 27 41 42 13 26 22.5 15 131 50 27 31 53 27 51 32 27 27 41 27 55 46 -0.78 - 4 0 0 27 13 36 13 26 24.0 16 131 50 27 3 49 27 23 24 26 59 38 27 27 37 -0.78 - 3 0 0 26 45 49 13 26 25.7 17 132 50 26 36 4 26 55 36 26 31 54 26 59 48 -0.78 - 2 0 0 26 18 22 13 26 27.4 18 132 49 26 8 39 26 28 7 26 4 29 26 32 18 -0.78 - 1 0 0 25 51 16 13 26 29.2 19 133 49 25 41 35 26 0 59 25 37 26 26 5 9 -0.79 0 0 0 25 24 31 13 26 31.1 20 133 49 25 14 52 25 34 12 25 10 44 25 38 22 -0.79 1 0 0 24 58 9 13 26 33.1 21 134 49 24 48 31 25 7 48 24 44 24 25 11 56 -0.79 2 0 0 24 32 9 13 26 35.2 22 135 48 24 22 33 24 41 46 24 18 27 24 45 54 -0.79 3 0 0 24 6 33 13 26 37.4 23 135 48 23 56 59 24 16 8 23 52 53 24 20 15 -0.79 4 0 0 23 41 21 13 26 39.6 24 136 48 23 31 49 23 50 54 23 27 44 23 55 0 -0.79 5 0 0 23 16 34 13 26 42.0 25 136 47 23 7 4 23 26 5 23 3 0 23 30 11 -0.80 6 0 0 22 52 13 13 26 44.4 26 137 47 22 42 44 23 1 42 22 38 41 23 5 47 -0.80 7 0 0 22 28 18 13 26 46.9 27 137 46 22 18 51 22 37 46 22 14 49 22 41 50 -0.80 8 0 0 22 4 50 13 26 49.5 28 138 46 21 55 25 22 14 16 21 51 23 22 18 19 -0.80 9 0 0 21 41 49 13 26 52.1 29 139 45 21 32 26 21 51 13 21 28 25 21 55 15 -0.80 10 0 0 21 19 16 13 26 54.9 30 139 45 21 9 55 21 28 38 21 5 54 21 32 40 -0.80 11 0 0 20 57 11 13 26 57.7 31 140 44 20 47 52 21 6 32 20 43 52 21 10 33 -0.80 12 0 0 20 35 36 13 27 0.6 31 141 44 20 26 18 20 44 55 20 22 19 20 48 55 -0.80 13 0 0 20 14 29 13 27 3.6 32 141 43 20 5 13 20 23 47 20 1 15 20 27 46 -0.80 14 0 0 19 53 53 13 27 6.6 33 142 43 19 44 38 20 3 8 19 40 41 20 7 7 -0.80 15 0 0 19 33 46 13 27 9.7 34 143 42 19 24 34 19 43 0 19 20 37 19 46 58 -0.81 16 0 0 19 14 11 13 27 12.9 35 143 41 19 4 59 19 23 23 19 1 3 19 27 20 -0.81 17 0 0 18 55 6 13 27 16.1 36 144 41 18 45 56 19 4 17 18 42 1 19 8 13 -0.81 18 0 0 18 36 32 13 27 19.4 36 145 40 18 27 24 18 45 42 18 23 30 18 49 38 -0.81 19 0 0 18 18 31 13 27 22.8 37 146 39 18 9 24 18 27 39 18 5 30 18 31 34 -0.81 20 0 0 18 1 1 13 27 26.2 38 147 38 17 51 56 18 10 8 17 48 3 18 14 2 -0.81 21 0 0 17 44 4 13 27 29.7 39 147 38 17 35 0 17 53 9 17 31 7 17 57 3 -0.81 22 0 0 17 27 39 13 27 33.2 40 148 37 17 18 37 17 36 43 17 14 45 17 40 37 -0.81 23 0 0 17 11 48 13 27 36.8 40 149 36 17 2 46 17 20 50 16 58 55 17 24 43 -0.81 24 0 0 16 56 29 13 27 40.4 41 150 35 16 47 29 17 5 30 16 43 38 17 9 23 -0.81 25 0 0 16 41 44 13 27 44.1 42 151 35 16 32 45 16 50 44 16 28 55 16 54 36 -0.81 26 0 0 16 27 32 13 27 47.8 42 152 34 16 18 35 16 36 31 16 14 45 16 40 22 -0.81 27 0 0 16 13 55 13 27 51.6 43 153 33 16 4 59 16 22 52 16 1 9 16 26 43 -0.81 28 0 0 16 0 51 13 27 55.4 44 154 32 15 51 56 16 9 48 15 48 7 16 13 38 -0.81 29 0 0 15 48 22 13 27 59.3 44 155 31 15 39 28 15 57 17 15 35 39 16 1 7 -0.82 30 0 0 15 36 27 13 28 3.1 45 156 30 15 27 34 15 45 21 15 23 46 15 49 11 -0.82 31 0 0 15 25 7 13 28 7.1 45 157 30 15 16 15 15 34 0 15 12 27 15 37 49 -0.82 32 0 0 15 14 21 13 28 11.0 46 158 29 15 5 30 15 23 14 15 1 43 15 27 2 -0.82 33 0 0 15 4 10 13 28 15.0 46 159 28 14 55 20 15 13 2 14 51 33 15 16 50 -0.82 34 0 0 14 54 35 13 28 19.1 47 161 27 14 45 45 15 3 25 14 41 58 15 7 13 -0.82 35 0 0 14 45 34 13 28 23.1 47 162 26 14 36 45 14 54 24 14 32 59 14 58 12 -0.82 36 0 0 14 37 9 13 28 27.2 48 163 25 14 28 21 14 45 58 14 24 35 14 49 45 -0.82 37 0 0 14 29 19 13 28 31.3 48 164 24 14 20 31 14 38 7 14 16 45 14 41 54 -0.82 38 0 0 14 22 4 13 28 35.4 49 166 23 14 13 17 14 30 52 14 9 32 14 34 39 -0.82 39 0 0 14 15 25 13 28 39.6 49 167 22 14 6 39 14 24 12 14 2 53 14 27 59 -0.82 40 0 0 14 9 21 13 28 43.7 49 168 21 14 0 36 14 18 8 13 56 51 14 21 54 -0.82 41 0 0 14 3 53 13 28 47.9 50 170 20 13 55 8 14 12 40 13 51 23 14 16 26 -0.82 42 0 0 13 59 1 13 28 52.1 50 171 20 13 50 16 14 7 47 13 46 32 14 11 33 -0.82 43 0 0 13 54 45 13 28 56.3 50 172 19 13 46 0 14 3 30 13 42 16 14 7 16 -0.82 44 0 0 13 51 4 13 29 0.5 50 174 18 13 42 20 13 59 49 13 38 36 14 3 35 -0.82 45 0 0 13 47 59 13 29 4.8 50 175 17 13 39 15 13 56 44 13 35 31 14 0 30 -0.82 46 0 0 13 45 30 13 29 9.0 50 177 16 13 36 47 13 54 15 13 33 3 13 58 0 -0.82 47 0 0 13 43 37 13 29 13.2 51 178 15 13 34 54 13 52 22 13 31 10 13 56 7 -0.82 48 0 0 13 42 20 13 29 17.5 51 179 14 13 33 37 13 51 5 13 29 53 13 54 50 -0.82 49 0 0 13 41 39 13 29 21.7 51 181 13 13 32 56 13 50 23 13 29 12 13 54 9 -0.82 50 0 0 13 41 34 13 29 26.0 51 182 12 13 32 50 13 50 18 13 29 6 13 54 3 -0.82 51 0 0 13 42 4 13 29 30.2 50 184 11 13 33 21 13 50 49 13 29 37 13 54 34 -0.82 52 0 0 13 43 11 13 29 34.5 50 185 10 13 34 28 13 51 55 13 30 43 13 55 41 -0.82 53 0 0 13 44 53 13 29 38.7 50 187 9 13 36 10 13 53 38 13 32 26 13 57 23 -0.82 54 0 0 13 47 12 13 29 42.9 50 188 8 13 38 28 13 55 57 13 34 44 13 59 42 -0.82 55 0 0 13 50 6 13 29 47.1 50 189 7 13 41 22 13 58 51 13 37 38 14 2 37 -0.82 56 0 0 13 53 36 13 29 51.3 50 191 6 13 44 52 14 2 22 13 41 7 14 6 7 -0.82 57 0 0 13 57 42 13 29 55.5 49 192 5 13 48 57 14 6 28 13 45 13 14 10 14 -0.82 58 0 0 14 2 24 13 29 59.7 49 194 4 13 53 39 14 11 10 13 49 54 14 14 56 -0.82 59 0 0 14 7 41 13 30 3.8 49 195 3 13 58 56 14 16 28 13 55 11 14 20 14 -0.82 60 0 0 14 13 34 13 30 8.0 48 196 2 14 4 48 14 22 21 14 1 3 14 26 8 -0.82 61 0 0 14 20 3 13 30 12.1 48 197 1 14 11 16 14 28 50 14 7 31 14 32 37 -0.82 62 0 0 14 27 7 13 30 16.2 48 199 0 14 18 20 14 35 55 14 14 34 14 39 42 -0.82 63 0 0 14 34 46 13 30 20.2 47 200 -1 14 25 59 14 43 35 14 22 13 14 47 22 -0.82 64 0 0 14 43 1 13 30 24.3 47 201 -2 14 34 13 14 51 51 14 30 26 14 55 38 -0.82 65 0 0 14 51 51 13 30 28.3 46 202 -3 14 43 2 15 0 42 14 39 15 15 4 29 -0.82 66 0 0 15 1 16 13 30 32.2 46 203 -4 14 52 26 15 10 8 14 48 39 15 13 56 -0.82 67 0 0 15 11 17 13 30 36.2 45 204 -5 15 2 26 15 20 9 14 58 38 15 23 57 -0.82 68 0 0 15 21 52 13 30 40.1 45 206 -6 15 13 0 15 30 45 15 9 12 15 34 34 -0.82 69 0 0 15 33 2 13 30 44.0 44 207 -7 15 24 9 15 41 55 15 20 21 15 45 45 -0.82 70 0 0 15 44 46 13 30 47.8 43 208 -8 15 35 52 15 53 41 15 32 4 15 57 31 -0.82 71 0 0 15 57 5 13 30 51.6 43 209 -9 15 48 10 16 6 1 15 44 21 16 9 51 -0.82 72 0 0 16 9 58 13 30 55.3 42 210 -10 16 1 2 16 18 55 15 57 12 16 22 46 -0.82 73 0 0 16 23 25 13 30 59.0 41 211 -11 16 14 28 16 32 23 16 10 38 16 36 14 -0.82 74 0 0 16 37 26 13 31 2.7 41 211 -12 16 28 28 16 46 25 16 24 37 16 50 17 -0.82 75 0 0 16 52 1 13 31 6.3 40 212 -13 16 43 1 17 1 1 16 39 10 17 4 53 -0.82 76 0 0 17 7 9 13 31 9.8 39 213 -14 16 58 8 17 16 11 16 54 16 17 20 3 -0.82 77 0 0 17 22 50 13 31 13.3 38 214 -15 17 13 48 17 31 53 17 9 56 17 35 46 -0.82 78 0 0 17 39 4 13 31 16.7 38 215 -16 17 30 1 17 48 9 17 26 8 17 52 3 -0.82 79 0 0 17 55 51 13 31 20.1 37 216 -17 17 46 46 18 4 57 17 42 53 18 8 52 -0.82 80 0 0 18 13 11 13 31 23.4 36 216 -18 18 4 4 18 22 18 18 0 11 18 26 13 -0.82 81 0 0 18 31 2 13 31 26.7 35 217 -19 18 21 54 18 40 11 18 18 0 18 44 6 -0.82 82 0 0 18 49 25 13 31 29.9 34 218 -20 18 40 16 18 58 35 18 36 21 19 2 32 -0.82 83 0 0 19 8 20 13 31 33.0 34 219 -21 18 59 9 19 17 32 18 55 13 19 21 29 -0.82 84 0 0 19 27 45 13 31 36.1 33 219 -22 19 18 33 19 36 59 19 14 37 19 40 56 -0.82 85 0 0 19 47 42 13 31 39.1 32 220 -23 19 38 28 19 56 57 19 34 31 20 0 55 -0.82 86 0 0 20 8 8 13 31 42.0 31 221 -24 19 58 53 20 17 25 19 54 55 20 21 24 -0.82 87 0 0 20 29 5 13 31 44.9 30 221 -25 20 19 48 20 38 23 20 15 49 20 42 23 -0.82 88 0 0 20 50 31 13 31 47.7 29 222 -25 20 41 12 20 59 51 20 37 13 21 3 52 -0.82 89 0 0 21 12 26 13 31 50.4 28 222 -26 21 3 5 21 21 48 20 59 5 21 25 49 -0.82 90 0 0 21 34 49 13 31 53.0 27 223 -27 21 25 27 21 44 13 21 21 26 21 48 15 -0.82 91 0 0 21 57 41 13 31 55.6 27 224 -28 21 48 17 22 7 6 21 44 15 22 11 9 -0.82 92 0 0 22 21 0 13 31 58.0 26 224 -29 22 11 34 22 30 27 22 7 32 22 34 31 -0.82 93 0 0 22 44 46 13 32 0.4 25 225 -30 22 35 18 22 54 15 22 31 15 22 58 19 -0.82 94 0 0 23 8 58 13 32 2.7 24 225 -31 22 59 28 23 18 29 22 55 25 23 22 34 -0.82 95 0 0 23 33 36 13 32 4.9 23 226 -32 23 24 5 23 43 9 23 20 0 23 47 15 -0.82 96 0 0 23 58 39 13 32 7.1 22 226 -33 23 49 6 24 8 13 23 45 0 24 12 20 -0.83 97 0 0 24 24 6 13 32 9.1 21 227 -34 24 14 31 24 33 43 24 10 25 24 37 50 -0.83 98 0 0 24 49 58 13 32 11.1 20 227 -34 24 40 21 24 59 36 24 36 14 25 3 44 -0.83 99 0 0 25 16 12 13 32 12.9 19 228 -35 25 6 33 25 25 52 25 2 26 25 30 1 -0.83 100 0 0 25 42 49 13 32 14.7 18 229 -36 25 33 8 25 52 31 25 29 0 25 56 41 -0.83 101 0 0 26 9 47 13 32 16.4 17 229 -37 26 0 5 26 19 31 25 55 55 26 23 42 -0.83 102 0 0 26 37 7 13 32 18.0 16 230 -38 26 27 22 26 46 52 26 23 12 26 51 4 -0.83 103 0 0 27 4 46 13 32 19.5 15 230 -38 26 55 0 27 14 34 26 50 49 27 18 46 -0.83 104 0 0 27 32 45 13 32 20.9 14 231 -39 27 22 57 27 42 35 27 18 45 27 46 48 -0.83 105 0 0 28 1 2 13 32 22.2 13 231 -40 27 51 12 28 10 54 27 47 0 28 15 8 -0.83 106 0 0 28 29 37 13 32 23.4 12 232 -41 28 19 45 28 39 31 28 15 32 28 43 46 -0.83 107 0 0 28 58 29 13 32 24.5 11 232 -41 28 48 35 29 8 24 28 44 21 29 12 40 -0.83 108 0 0 29 27 36 13 32 25.5 10 233 -42 29 17 40 29 37 33 29 13 25 29 41 50 -0.83 109 0 0 29 56 58 13 32 26.4 9 233 -43 29 47 1 30 6 57 29 42 45 30 11 14 -0.84 110 0 0 30 26 34 13 32 27.2 8 234 -43 30 16 35 30 36 35 30 12 19 30 40 53 -0.84 111 0 0 30 56 23 13 32 27.9 7 234 -44 30 46 22 31 6 26 30 42 5 31 10 45 -0.84 112 0 0 31 26 25 13 32 28.6 6 235 -45 31 16 22 31 36 29 31 12 4 31 40 49 -0.84 113 0 0 31 56 37 13 32 29.1 5 235 -45 31 46 33 32 6 43 31 42 14 32 11 4 -0.85 114 0 0 32 26 59 13 32 29.5 4 236 -46 32 16 53 32 37 7 32 12 34 32 41 28 -0.86 115 0 0 32 57 31 13 32 29.9 3 236 -46 32 47 23 33 7 40 32 43 3 33 12 2 -0.87 116 0 0 33 28 10 13 32 30.1 2 237 -47 33 18 1 33 38 21 33 13 40 33 42 44 -0.90 117 0 0 33 58 57 13 32 30.3 1 237 -47 33 48 46 34 9 9 33 44 24 34 13 33 -0.97 118 0 0 34 29 49 13 32 30.3 0 238 -48 34 19 37 34 40 3 34 15 15 34 44 27 -1.65 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 321-134814 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 07 47.6598 DE: -25 49 13.173 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 07 47.6598 DE: -25 49 13.173 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * B mag [mag]: 11.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (974) Lioba asteroid class: approx. diameter [km]: 25 approx. diameter ["]: 0.013 distance from Earth [AU]: 2.64400 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.009", 0.002", 100.119° remarks: * orbital elements for (974)Lioba : Mean anomaly = 277.5370304705 deg Arg. of pericenter = 302.4041046316 deg Long. of node = 86.6294723137 deg Inclination = 5.4532107547 deg Eccentricity = 0.1096629876 Semimajor axis = 2.5339956832 AU Perihelion dist = 2.2561101460 AU Mag: H = 10.48, G = 0.15 Epoch of elements : MJD 60595.56204317 TDT (2024 Oct 12.5620) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,0.96,2024,10,12,13.489043,0.005795,0.634955,14.635048,-0.143091,0.005390,0.000017,-0.000001,0.000000 48.3789,-25.8181,-25.75,-7.71,False UCAC4 321-134814,18.12990553,-25.8203258,11.85,11.66,11.56,0.0,0,,18.15533664,-25.8180717,4.03,3.69,0,0,0 974,Lioba,15.66,24.838,2.6440,0,0,3.605,-0.48,,1.6,0 0,277.3997,2024,10,12,302.4041,86.6295,5.4532,0.10966,2.53400,2.25611,10.47,5.0,0.15 1.214,0.0093,0.0023,100,0.0028,Known errors,0.61,0,-1,-1 20241012_134814,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org