IOTA/IOTA-ES occultation update for (2805) Kalle / UCAC4 312-092050 event on 2024 Sep 11, 14:20 UT Visible from Summary ------- On 2024 Sep 11 UT, the 16.835 km diameter asteroid (2805) Kalle will occult a 11.9 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.85 mag to 17.74 mag (the magnitude of the asteroid) for at most 0.870 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 11, 14:15 - 2024 Sep 11, 14:24 * geocentric midpoint of event [JD]: 2460565.09727979 * magnitude of target star: 11.89 * magnitude drop [mag]: 5.85 * estimated maximum duration [s]: 0.870 * Moon: 54 % sunlit, 10° distance * Sun: 85° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.33 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.002", 105°) * approx speed of asteroid's shadow [km/s]: 19.2620 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 312-092050 by 2805 Kalle on 2024 Sep 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 - 21 0 0 34 10 30 14 15 31.7 1 125 57 34 3 51 34 17 9 33 59 27 34 21 35 .... - 20 0 0 33 36 20 14 15 31.8 2 125 58 33 29 42 33 42 59 33 25 18 33 47 24 -0.35 - 19 0 0 33 2 6 14 15 32.1 3 126 58 32 55 28 33 8 44 32 51 5 33 13 9 -0.47 - 18 0 0 32 27 49 14 15 32.5 4 126 58 32 21 12 32 34 26 32 16 49 32 38 51 -0.52 - 17 0 0 31 53 30 14 15 33.0 5 127 58 31 46 54 32 0 7 31 42 31 32 4 31 -0.55 - 16 0 0 31 19 11 14 15 33.7 6 128 58 31 12 36 31 25 47 31 8 13 31 30 11 -0.57 - 15 0 0 30 44 53 14 15 34.5 7 128 58 30 38 18 30 51 28 30 33 56 30 55 51 -0.59 - 14 0 0 30 10 36 14 15 35.4 8 129 58 30 4 2 30 17 10 29 59 41 30 21 33 -0.60 - 13 0 0 29 36 22 14 15 36.5 9 129 57 29 29 49 29 42 56 29 25 28 29 47 17 -0.61 - 12 0 0 29 2 13 14 15 37.6 10 130 57 28 55 41 29 8 45 28 51 21 29 13 7 -0.61 - 11 0 0 28 28 9 14 15 39.0 11 130 57 28 21 38 28 34 41 28 17 18 28 39 1 -0.62 - 10 0 0 27 54 12 14 15 40.4 12 131 57 27 47 42 28 0 42 27 43 23 28 5 2 -0.62 - 9 0 0 27 20 22 14 15 42.0 13 131 56 27 13 53 27 26 52 27 9 35 27 31 11 -0.63 - 8 0 0 26 46 42 14 15 43.8 14 132 56 26 40 14 26 53 11 26 35 56 26 57 29 -0.63 - 7 0 0 26 13 12 14 15 45.6 15 132 55 26 6 45 26 19 39 26 2 28 26 23 57 -0.63 - 6 0 0 25 39 53 14 15 47.6 16 133 55 25 33 27 25 46 20 25 29 11 25 50 37 -0.64 - 5 0 0 25 6 47 14 15 49.8 17 133 55 25 0 22 25 13 12 24 56 7 25 17 29 -0.64 - 4 0 0 24 33 54 14 15 52.0 18 134 54 24 27 30 24 40 18 24 23 16 24 44 34 -0.64 - 3 0 0 24 1 16 14 15 54.4 19 134 53 23 54 54 24 7 39 23 50 40 24 11 54 -0.64 - 2 0 0 23 28 54 14 15 57.0 20 135 53 23 22 32 23 35 16 23 18 19 23 39 30 -0.64 - 1 0 0 22 56 48 14 15 59.6 21 135 52 22 50 28 23 3 9 22 46 16 23 7 22 -0.65 0 0 0 22 25 0 14 16 2.4 22 136 52 22 18 42 22 31 20 22 14 30 22 35 32 -0.65 1 0 0 21 53 32 14 16 5.4 23 136 51 21 47 14 21 59 50 21 43 3 22 4 1 -0.65 2 0 0 21 22 23 14 16 8.4 25 137 50 21 16 6 21 28 39 21 11 56 21 32 50 -0.65 3 0 0 20 51 34 14 16 11.6 26 137 50 20 45 19 20 57 50 20 41 10 21 2 0 -0.65 4 0 0 20 21 8 14 16 14.9 27 138 49 20 14 54 20 27 22 20 10 46 20 31 31 -0.65 5 0 0 19 51 4 14 16 18.3 28 138 48 19 44 51 19 57 17 19 40 44 20 1 25 -0.65 6 0 0 19 21 23 14 16 21.8 29 139 47 19 15 12 19 27 35 19 11 5 19 31 43 -0.65 7 0 0 18 52 7 14 16 25.5 30 139 46 18 45 57 18 58 18 18 41 51 19 2 24 -0.66 8 0 0 18 23 16 14 16 29.2 31 140 46 18 17 7 18 29 25 18 13 2 18 33 31 -0.66 9 0 0 17 54 50 14 16 33.1 32 140 45 17 48 43 18 0 58 17 44 39 18 5 3 -0.66 10 0 0 17 26 52 14 16 37.1 32 141 44 17 20 45 17 32 59 17 16 42 17 37 3 -0.66 11 0 0 16 59 20 14 16 41.2 33 142 43 16 53 15 17 5 26 16 49 13 17 9 29 -0.66 12 0 0 16 32 17 14 16 45.4 34 142 42 16 26 13 16 38 21 16 22 11 16 42 24 -0.66 13 0 0 16 5 42 14 16 49.6 35 143 41 15 59 39 16 11 45 15 55 39 16 15 47 -0.66 14 0 0 15 39 36 14 16 54.0 36 144 40 15 33 35 15 45 38 15 29 35 15 49 39 -0.66 15 0 0 15 14 1 14 16 58.5 37 144 40 15 8 0 15 20 1 15 4 1 15 24 1 -0.66 16 0 0 14 48 55 14 17 3.1 38 145 39 14 42 56 14 54 55 14 38 58 14 58 54 -0.66 17 0 0 14 24 21 14 17 7.7 39 146 38 14 18 23 14 30 19 14 14 26 14 34 18 -0.67 18 0 0 14 0 18 14 17 12.5 40 146 37 13 54 21 14 6 15 13 50 25 14 10 13 -0.67 19 0 0 13 36 47 14 17 17.3 41 147 36 13 30 52 13 42 43 13 26 56 13 46 40 -0.67 20 0 0 13 13 49 14 17 22.2 42 148 35 13 7 54 13 19 44 13 3 59 13 23 40 -0.67 21 0 0 12 51 23 14 17 27.1 42 149 34 12 45 30 12 57 17 12 41 35 13 1 12 -0.67 22 0 0 12 29 31 14 17 32.2 43 150 33 12 23 38 12 35 23 12 19 45 12 39 18 -0.67 23 0 0 12 8 12 14 17 37.3 44 151 32 12 2 21 12 14 3 11 58 28 12 17 57 -0.67 24 0 0 11 47 27 14 17 42.5 45 151 31 11 41 37 11 53 17 11 37 44 11 57 10 -0.67 25 0 0 11 27 16 14 17 47.7 46 152 30 11 21 27 11 33 6 11 17 36 11 36 58 -0.67 26 0 0 11 7 40 14 17 53.0 46 153 29 11 1 52 11 13 29 10 58 1 11 17 21 -0.67 27 0 0 10 48 39 14 17 58.4 47 154 28 10 42 52 10 54 27 10 39 2 10 58 18 -0.67 28 0 0 10 30 14 14 18 3.8 48 155 27 10 24 27 10 36 0 10 20 38 10 39 50 -0.67 29 0 0 10 12 23 14 18 9.2 48 156 26 10 6 38 10 18 9 10 2 49 10 21 59 -0.67 30 0 0 9 55 8 14 18 14.8 49 158 25 9 49 24 10 0 53 9 45 36 10 4 42 -0.67 31 0 0 9 38 30 14 18 20.3 50 159 24 9 32 46 9 44 13 9 28 58 9 48 2 -0.67 32 0 0 9 22 27 14 18 25.9 50 160 23 9 16 44 9 28 10 9 12 57 9 31 58 -0.67 33 0 0 9 7 0 14 18 31.5 51 161 22 9 1 19 9 12 43 8 57 32 9 16 30 -0.68 34 0 0 8 52 10 14 18 37.2 52 162 21 8 46 30 8 57 52 8 42 43 9 1 39 -0.68 35 0 0 8 37 57 14 18 42.9 52 164 20 8 32 17 8 43 38 8 28 31 8 47 24 -0.68 36 0 0 8 24 20 14 18 48.7 53 165 19 8 18 41 8 30 0 8 14 56 8 33 46 -0.68 37 0 0 8 11 21 14 18 54.4 53 166 18 8 5 42 8 17 0 8 1 57 8 20 45 -0.68 38 0 0 7 58 58 14 19 0.2 53 168 17 7 53 20 8 4 36 7 49 36 8 8 22 -0.68 39 0 0 7 47 13 14 19 6.0 54 169 16 7 41 35 7 52 50 7 37 51 7 56 35 -0.68 40 0 0 7 36 4 14 19 11.9 54 171 15 7 30 27 7 41 41 7 26 44 7 45 26 -0.68 41 0 0 7 25 33 14 19 17.7 54 172 14 7 19 57 7 31 10 7 16 14 7 34 54 -0.68 42 0 0 7 15 40 14 19 23.6 55 174 13 7 10 4 7 21 16 7 6 21 7 24 59 -0.68 43 0 0 7 6 24 14 19 29.5 55 175 12 7 0 48 7 11 59 6 57 6 7 15 42 -0.68 44 0 0 6 57 45 14 19 35.4 55 177 11 6 52 10 7 3 20 6 48 28 7 7 3 -0.68 45 0 0 6 49 44 14 19 41.3 55 178 10 6 44 10 6 55 18 6 40 28 6 59 1 -0.68 46 0 0 6 42 20 14 19 47.2 56 180 9 6 36 47 6 47 55 6 33 5 6 51 37 -0.68 47 0 0 6 35 35 14 19 53.1 56 182 8 6 30 1 6 41 8 6 26 20 6 44 50 -0.68 48 0 0 6 29 27 14 19 59.0 56 183 7 6 23 54 6 35 0 6 20 12 6 38 42 -0.68 49 0 0 6 23 56 14 20 4.9 56 185 6 6 18 24 6 29 29 6 14 43 6 33 11 -0.68 50 0 0 6 19 4 14 20 10.8 56 186 4 6 13 31 6 24 37 6 9 51 6 28 18 -0.68 51 0 0 6 14 49 14 20 16.7 56 188 3 6 9 17 6 20 22 6 5 36 6 24 3 -0.68 52 0 0 6 11 12 14 20 22.6 56 190 2 6 5 40 6 16 45 6 2 0 6 20 26 -0.68 53 0 0 6 8 13 14 20 28.5 55 191 1 6 2 41 6 13 45 5 59 1 6 17 26 -0.68 54 0 0 6 5 52 14 20 34.3 55 193 0 6 0 20 6 11 24 5 56 40 6 15 5 -0.68 55 0 0 6 4 8 14 20 40.2 55 194 -1 5 58 36 6 9 40 5 54 56 6 13 21 -0.68 56 0 0 6 3 2 14 20 46.0 55 196 -2 5 57 31 6 8 34 5 53 51 6 12 15 -0.68 57 0 0 6 2 34 14 20 51.8 55 197 -3 5 57 3 6 8 6 5 53 23 6 11 47 -0.68 58 0 0 6 2 44 14 20 57.6 54 199 -4 5 57 13 6 8 16 5 53 33 6 11 57 -0.68 59 0 0 6 3 32 14 21 3.4 54 200 -5 5 58 1 6 9 4 5 54 20 6 12 45 -0.68 60 0 0 6 4 58 14 21 9.1 53 202 -6 5 59 26 6 10 30 5 55 46 6 14 10 -0.68 61 0 0 6 7 1 14 21 14.8 53 203 -7 6 1 29 6 12 33 5 57 49 6 16 14 -0.68 62 0 0 6 9 42 14 21 20.5 53 204 -8 6 4 10 6 15 14 6 0 30 6 18 55 -0.68 63 0 0 6 13 1 14 21 26.1 52 206 -9 6 7 29 6 18 33 6 3 48 6 22 14 -0.68 64 0 0 6 16 57 14 21 31.8 52 207 -10 6 11 25 6 22 30 6 7 44 6 26 11 -0.68 65 0 0 6 21 32 14 21 37.3 51 208 -11 6 15 59 6 27 4 6 12 18 6 30 46 -0.68 66 0 0 6 26 43 14 21 42.9 51 209 -12 6 21 11 6 32 16 6 17 30 6 35 58 -0.68 67 0 0 6 32 33 14 21 48.3 50 210 -13 6 27 0 6 38 6 6 23 18 6 41 48 -0.68 68 0 0 6 38 59 14 21 53.8 49 211 -14 6 33 26 6 44 33 6 29 45 6 48 15 -0.68 69 0 0 6 46 4 14 21 59.2 49 212 -15 6 40 30 6 51 38 6 36 48 6 55 20 -0.68 70 0 0 6 53 45 14 22 4.5 48 213 -16 6 48 11 6 59 20 6 44 29 7 3 3 -0.68 71 0 0 7 2 4 14 22 9.8 47 214 -17 6 56 30 7 7 40 6 52 48 7 11 22 -0.68 72 0 0 7 11 1 14 22 15.1 47 215 -18 7 5 26 7 16 36 7 1 43 7 20 19 -0.68 73 0 0 7 20 34 14 22 20.2 46 216 -19 7 14 59 7 26 10 7 11 16 7 29 54 -0.68 74 0 0 7 30 45 14 22 25.4 45 217 -20 7 25 9 7 36 21 7 21 25 7 40 5 -0.68 75 0 0 7 41 32 14 22 30.4 44 218 -21 7 35 56 7 47 9 7 32 12 7 50 54 -0.68 76 0 0 7 52 57 14 22 35.4 44 219 -22 7 47 19 7 58 35 7 43 35 8 2 19 -0.68 77 0 0 8 4 58 14 22 40.4 43 219 -23 7 59 20 8 10 36 7 55 36 8 14 21 -0.68 78 0 0 8 17 36 14 22 45.2 42 220 -24 8 11 57 8 23 15 8 8 12 8 27 0 -0.68 79 0 0 8 30 50 14 22 50.0 41 221 -25 8 25 11 8 36 30 8 21 26 8 40 16 -0.68 80 0 0 8 44 41 14 22 54.8 40 221 -26 8 39 1 8 50 22 8 35 15 8 54 8 -0.68 81 0 0 8 59 8 14 22 59.4 40 222 -26 8 53 27 9 4 49 8 49 41 9 8 36 -0.68 82 0 0 9 14 11 14 23 4.0 39 223 -27 9 8 30 9 19 53 9 4 43 9 23 41 -0.68 83 0 0 9 29 50 14 23 8.5 38 223 -28 9 24 8 9 35 33 9 20 20 9 39 21 -0.68 84 0 0 9 46 5 14 23 12.9 37 224 -29 9 40 22 9 51 49 9 36 34 9 55 37 -0.68 85 0 0 10 2 55 14 23 17.2 36 225 -30 9 57 11 10 8 40 9 53 22 10 12 29 -0.68 86 0 0 10 20 20 14 23 21.4 35 225 -31 10 14 35 10 26 6 10 10 46 10 29 56 -0.68 87 0 0 10 38 21 14 23 25.6 34 226 -32 10 32 35 10 44 7 10 28 45 10 47 58 -0.68 88 0 0 10 56 56 14 23 29.6 33 226 -33 10 51 9 11 2 43 10 47 19 11 6 34 -0.68 89 0 0 11 16 6 14 23 33.6 32 227 -34 11 10 18 11 21 54 11 6 27 11 25 46 -0.68 90 0 0 11 35 49 14 23 37.5 31 227 -35 11 30 1 11 41 39 11 26 9 11 45 31 -0.68 91 0 0 11 56 7 14 23 41.2 30 228 -36 11 50 17 12 1 58 11 46 25 12 5 51 -0.68 92 0 0 12 16 59 14 23 44.9 29 228 -37 12 11 8 12 22 50 12 7 15 12 26 44 -0.68 93 0 0 12 38 23 14 23 48.5 28 228 -37 12 32 31 12 44 16 12 28 38 12 48 10 -0.68 94 0 0 13 0 21 14 23 51.9 27 229 -38 12 54 28 13 6 14 12 50 33 13 10 10 -0.68 95 0 0 13 22 51 14 23 55.3 26 229 -39 13 16 57 13 28 45 13 13 1 13 32 41 -0.68 96 0 0 13 45 53 14 23 58.5 25 230 -40 13 39 57 13 51 48 13 36 1 13 55 45 -0.68 97 0 0 14 9 26 14 24 1.6 24 230 -41 14 3 30 14 15 23 13 59 33 14 19 20 -0.68 98 0 0 14 33 31 14 24 4.6 23 230 -42 14 27 33 14 39 29 14 23 36 14 43 27 -0.68 99 0 0 14 58 6 14 24 7.5 22 231 -42 14 52 7 15 4 5 14 48 9 15 8 4 -0.68 100 0 0 15 23 12 14 24 10.3 21 231 -43 15 17 12 15 29 12 15 13 13 15 33 12 -0.68 101 0 0 15 48 47 14 24 12.9 20 232 -44 15 42 46 15 54 48 15 38 46 15 58 49 -0.68 102 0 0 16 14 51 14 24 15.5 19 232 -45 16 8 48 16 20 53 16 4 48 16 24 55 -0.68 103 0 0 16 41 23 14 24 17.9 18 232 -45 16 35 20 16 47 27 16 31 18 16 51 29 -0.68 104 0 0 17 8 24 14 24 20.1 17 233 -46 17 2 19 17 14 29 16 58 17 17 18 32 -0.68 105 0 0 17 35 51 14 24 22.3 16 233 -47 17 29 45 17 41 57 17 25 42 17 46 1 -0.68 106 0 0 18 3 45 14 24 24.3 15 233 -47 17 57 38 18 9 52 17 53 34 18 13 57 -0.68 107 0 0 18 32 5 14 24 26.2 14 234 -48 18 25 56 18 38 13 18 21 52 18 42 19 -0.68 108 0 0 19 0 49 14 24 27.9 13 234 -48 18 54 40 19 6 59 18 50 34 19 11 6 -0.68 109 0 0 19 29 58 14 24 29.6 12 235 -49 19 23 47 19 36 10 19 19 41 19 40 17 -0.68 110 0 0 19 59 31 14 24 31.0 11 235 -50 19 53 19 20 5 43 19 49 12 20 9 51 -0.68 111 0 0 20 29 26 14 24 32.4 10 235 -50 20 23 13 20 35 40 20 19 5 20 39 48 -0.69 112 0 0 20 59 43 14 24 33.6 9 236 -51 20 53 28 21 5 58 20 49 20 21 10 7 -0.69 113 0 0 21 30 21 14 24 34.7 8 236 -51 21 24 5 21 36 37 21 19 56 21 40 47 -0.69 114 0 0 22 1 19 14 24 35.6 7 236 -51 21 55 2 22 7 36 21 50 52 22 11 47 -0.69 115 0 0 22 32 36 14 24 36.4 6 237 -52 22 26 18 22 38 55 22 22 7 22 43 7 -0.70 116 0 0 23 4 11 14 24 37.1 5 237 -52 22 57 52 23 10 31 22 53 40 23 14 44 -0.70 117 0 0 23 36 4 14 24 37.6 4 238 -52 23 29 43 23 42 25 23 25 30 23 46 38 -0.71 118 0 0 24 8 12 14 24 38.0 3 238 -53 24 1 51 24 14 35 23 57 37 24 18 49 -0.73 119 0 0 24 40 36 14 24 38.2 1 238 -53 24 34 13 24 47 0 24 29 59 24 51 15 -0.77 120 0 0 25 13 14 14 24 38.4 0 239 -53 25 6 50 25 19 39 25 2 35 25 23 55 -1.03 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 312-092050 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 46 40.8504 DE: -27 43 43.039 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 46 40.8502 DE: -27 43 43.039 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.9 * B mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2805) Kalle asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.009 distance from Earth [AU]: 2.47930 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 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): 0.012", 0.002", 105.23° remarks: * orbital elements for (2805)Kalle : Mean anomaly = 293.6352472762 deg Arg. of pericenter = 310.2104140058 deg Long. of node = 49.0737718530 deg Inclination = 6.8802347025 deg Eccentricity = 0.1440402327 Semimajor axis = 2.6946870112 AU Perihelion dist = 2.3065436672 AU Mag: H = 12.62, G = 0.15 Epoch of elements : MJD 60564.59727950 TDT (2024 Sep 11.5973) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,0.87,2024,9,11,14.334715,0.053260,0.560379,10.823486,-1.026301,0.005521,-0.000733,0.000000,0.000000 45.9376,-27.7743,-35.91,4.22,False UCAC4 312-092050,16.77801402,-27.7286220,12.14,11.89,11.76,0.0,0,,16.80357137,-27.7742882,5.86,5.55,0,0,0 2805,Kalle,17.74,16.835,2.4793,0,0,2.894,-3.64,,1.0,0 0,293.5022,2024,9,11,310.2104,49.0738,6.8802,0.14404,2.69469,2.30654,12.62,5.0,0.15 1.332,0.0123,0.0023,105,0.0031,Known errors,1.31,0,-1,-1 20240911_092050,60140.56 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org