IOTA/IOTA-ES occultation update for (1135) Colchis / UCAC4 312-135447 event on 2024 Sep 20, 03:26 UT Visible from Summary ------- On 2024 Sep 20 UT, the 51.03 km diameter asteroid (1135) Colchis will occult a 11.6 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 3.83 mag to 15.43 mag (the magnitude of the asteroid) for at most 3.160 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 20, 03:21 - 2024 Sep 20, 03:31 * geocentric midpoint of event [JD]: 2460573.64337167 * magnitude of target star: 11.63 * magnitude drop [mag]: 3.83 * estimated maximum duration [s]: 3.160 * Moon: 94 % sunlit, 116° distance * Sun: 93° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 67 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.003", 89°) * approx speed of asteroid's shadow [km/s]: 16.1684 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 312-135447 by 1135 Colchis on 2024 Sep 20 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 147 0 0 27 39 9 3 21 28.1 0 122 58 27 18 0 28 0 26 27 13 28 28 5 1 .... 148 0 0 27 6 29 3 21 28.2 1 122 58 26 45 25 27 27 41 26 40 55 27 32 14 -0.34 149 0 0 26 34 12 3 21 28.5 2 123 57 26 13 14 26 55 18 26 8 45 26 59 51 -0.56 150 0 0 26 2 20 3 21 29.0 3 123 57 25 41 27 26 23 20 25 36 59 26 27 51 -0.65 151 0 0 25 30 52 3 21 29.6 4 124 57 25 10 4 25 51 47 25 5 38 25 56 17 -0.69 152 0 0 24 59 50 3 21 30.4 5 124 57 24 39 8 25 20 39 24 34 42 25 25 8 -0.72 153 0 0 24 29 15 3 21 31.4 7 124 56 24 8 38 24 49 58 24 4 14 24 54 26 -0.74 154 0 0 23 59 7 3 21 32.5 8 125 56 23 38 36 24 19 46 23 34 13 24 24 12 -0.76 155 0 0 23 29 28 3 21 33.9 9 125 55 23 9 2 23 50 1 23 4 40 23 54 27 -0.77 156 0 0 23 0 18 3 21 35.3 10 126 55 22 39 58 23 20 46 22 35 37 23 25 10 -0.78 157 0 0 22 31 39 3 21 37.0 11 126 54 22 11 23 22 52 1 22 7 3 22 56 24 -0.78 158 0 0 22 3 30 3 21 38.8 12 126 54 21 43 19 22 23 47 21 39 1 22 28 9 -0.79 159 0 0 21 35 52 3 21 40.8 13 127 53 21 15 47 21 56 4 21 11 29 22 0 25 -0.79 160 0 0 21 8 47 3 21 43.0 14 127 53 20 48 46 21 28 54 20 44 30 21 33 14 -0.80 161 0 0 20 42 14 3 21 45.3 15 128 52 20 22 19 21 2 16 20 18 3 21 6 35 -0.80 162 0 0 20 16 15 3 21 47.8 16 128 51 19 56 24 20 36 12 19 52 10 20 40 29 -0.81 163 0 0 19 50 49 3 21 50.4 17 129 51 19 31 3 20 10 42 19 26 50 20 14 58 -0.81 164 0 0 19 25 58 3 21 53.2 18 129 50 19 6 17 19 45 46 19 2 5 19 50 2 -0.81 165 0 0 19 1 42 3 21 56.1 19 129 49 18 42 6 19 21 25 18 37 54 19 25 40 -0.81 166 0 0 18 38 2 3 21 59.2 20 130 49 18 18 30 18 57 40 18 14 19 19 1 54 -0.82 167 0 0 18 14 57 3 22 2.5 21 130 48 17 55 29 18 34 31 17 51 20 18 38 44 -0.82 168 0 0 17 52 29 3 22 5.9 22 131 47 17 33 5 18 11 58 17 28 56 18 16 10 -0.82 169 0 0 17 30 37 3 22 9.4 23 131 46 17 11 18 17 50 3 17 7 10 17 54 13 -0.82 170 0 0 17 9 23 3 22 13.1 24 132 45 16 50 8 17 28 44 16 46 1 17 32 54 -0.82 171 0 0 16 48 46 3 22 16.9 25 132 45 16 29 35 17 8 3 16 25 28 17 12 12 -0.83 172 0 0 16 28 47 3 22 20.8 26 133 44 16 9 39 16 48 0 16 5 34 16 52 8 -0.83 173 0 0 16 9 26 3 22 24.9 26 133 43 15 50 22 16 28 36 15 46 18 16 32 43 -0.83 174 0 0 15 50 44 3 22 29.1 27 134 42 15 31 43 16 9 49 15 27 39 16 13 56 -0.83 175 0 0 15 32 40 3 22 33.5 28 134 41 15 13 43 15 51 42 15 9 40 15 55 48 -0.83 176 0 0 15 15 15 3 22 37.9 29 135 40 14 56 22 15 34 14 14 52 19 15 38 19 -0.83 177 0 0 14 58 29 3 22 42.5 30 135 39 14 39 39 15 17 25 14 35 38 15 21 30 -0.83 178 0 0 14 42 23 3 22 47.2 31 136 38 14 23 36 15 1 16 14 19 35 15 5 20 -0.84 179 0 0 14 26 57 3 22 52.0 32 136 37 14 8 13 14 45 46 14 4 12 14 49 49 -0.84 -180 0 0 14 12 10 3 22 57.0 33 137 37 13 53 29 14 30 57 13 49 29 14 34 59 -0.84 -179 0 0 13 58 4 3 23 2.0 34 138 36 13 39 25 14 16 48 13 35 26 14 20 49 -0.84 -178 0 0 13 44 37 3 23 7.2 34 138 35 13 26 2 14 3 19 13 22 3 14 7 20 -0.84 -177 0 0 13 31 52 3 23 12.4 35 139 34 13 13 18 13 50 30 13 9 20 13 54 31 -0.84 -176 0 0 13 19 46 3 23 17.8 36 140 33 13 1 15 13 38 22 12 57 17 13 42 22 -0.84 -175 0 0 13 8 21 3 23 23.2 37 140 32 12 49 52 13 26 55 12 45 55 13 30 55 -0.84 -174 0 0 12 57 37 3 23 28.8 38 141 31 12 39 10 13 16 9 12 35 14 13 20 8 -0.84 -173 0 0 12 47 34 3 23 34.4 38 142 30 12 29 9 13 6 4 12 25 13 13 10 3 -0.84 -172 0 0 12 38 12 3 23 40.1 39 143 29 12 19 49 12 56 40 12 15 53 13 0 38 -0.85 -171 0 0 12 29 31 3 23 46.0 40 143 28 12 11 9 12 47 57 12 7 14 12 51 55 -0.85 -170 0 0 12 21 31 3 23 51.8 40 144 27 12 3 11 12 39 56 11 59 16 12 43 53 -0.85 -169 0 0 12 14 12 3 23 57.8 41 145 26 11 55 54 12 32 35 11 51 59 12 36 33 -0.85 -168 0 0 12 7 35 3 24 3.9 42 146 25 11 49 17 12 25 57 11 45 23 12 29 54 -0.85 -167 0 0 12 1 39 3 24 10.0 42 147 24 11 43 23 12 20 0 11 39 28 12 23 56 -0.85 -166 0 0 11 56 24 3 24 16.2 43 148 23 11 38 9 12 14 44 11 34 15 12 18 41 -0.85 -165 0 0 11 51 51 3 24 22.5 44 149 22 11 33 37 12 10 10 11 29 43 12 14 7 -0.85 -164 0 0 11 48 0 3 24 28.8 44 150 21 11 29 46 12 6 18 11 25 52 12 10 14 -0.85 -163 0 0 11 44 50 3 24 35.2 45 151 20 11 26 37 12 3 8 11 22 43 12 7 4 -0.85 -162 0 0 11 42 22 3 24 41.7 45 152 19 11 24 9 12 0 39 11 20 16 12 4 35 -0.85 -161 0 0 11 40 36 3 24 48.2 46 153 18 11 22 23 11 58 53 11 18 30 12 2 49 -0.85 -160 0 0 11 39 31 3 24 54.7 46 154 17 11 21 19 11 57 48 11 17 25 12 1 44 -0.85 -159 0 0 11 39 8 3 25 1.4 47 155 16 11 20 56 11 57 25 11 17 2 12 1 21 -0.85 -158 0 0 11 39 27 3 25 8.0 47 156 15 11 21 15 11 57 44 11 17 21 12 1 40 -0.85 -157 0 0 11 40 28 3 25 14.7 47 158 14 11 22 15 11 58 45 11 18 22 12 2 41 -0.85 -156 0 0 11 42 10 3 25 21.5 48 159 13 11 23 57 12 0 28 11 20 4 12 4 24 -0.85 -155 0 0 11 44 35 3 25 28.3 48 160 12 11 26 21 12 2 53 11 22 27 12 6 49 -0.85 -154 0 0 11 47 41 3 25 35.1 48 161 11 11 29 27 12 6 0 11 25 33 12 9 57 -0.86 -153 0 0 11 51 29 3 25 41.9 49 163 10 11 33 14 12 9 49 11 29 20 12 13 46 -0.86 -152 0 0 11 55 59 3 25 48.8 49 164 9 11 37 43 12 14 20 11 33 49 12 18 17 -0.86 -151 0 0 12 1 11 3 25 55.7 49 166 8 11 42 54 12 19 33 11 39 0 12 23 30 -0.86 -150 0 0 12 7 5 3 26 2.7 49 167 7 11 48 47 12 25 28 11 44 52 12 29 26 -0.86 -149 0 0 12 13 40 3 26 9.6 49 168 6 11 55 21 12 32 5 11 51 26 12 36 3 -0.86 -148 0 0 12 20 58 3 26 16.6 49 170 5 12 2 37 12 39 24 11 58 41 12 43 22 -0.86 -147 0 0 12 28 57 3 26 23.5 49 171 4 12 10 34 12 47 25 12 6 38 12 51 23 -0.86 -146 0 0 12 37 38 3 26 30.5 49 172 3 12 19 13 12 56 8 12 15 17 13 0 6 -0.86 -145 0 0 12 47 1 3 26 37.5 49 174 2 12 28 34 13 5 32 12 24 37 13 9 32 -0.86 -144 0 0 12 57 5 3 26 44.5 49 175 1 12 38 36 13 15 39 12 34 39 13 19 38 -0.86 -143 0 0 13 7 51 3 26 51.5 49 177 0 12 49 20 13 26 27 12 45 22 13 30 27 -0.86 -142 0 0 13 19 18 3 26 58.5 49 178 -1 13 0 45 13 37 57 12 56 47 13 41 57 -0.86 -141 0 0 13 31 27 3 27 5.5 49 179 -2 13 12 51 13 50 8 13 8 52 13 54 9 -0.86 -140 0 0 13 44 17 3 27 12.5 49 181 -3 13 25 39 14 3 1 13 21 39 14 7 3 -0.86 -139 0 0 13 57 48 3 27 19.4 48 182 -4 13 39 7 14 16 35 13 35 7 14 20 37 -0.86 -138 0 0 14 12 1 3 27 26.4 48 184 -5 13 53 17 14 30 51 13 49 16 14 34 54 -0.86 -137 0 0 14 26 54 3 27 33.3 48 185 -6 14 8 7 14 45 47 14 4 6 14 49 51 -0.86 -136 0 0 14 42 29 3 27 40.2 47 186 -7 14 23 38 15 1 25 14 19 37 15 5 29 -0.86 -135 0 0 14 58 44 3 27 47.0 47 188 -8 14 39 50 15 17 43 14 35 48 15 21 48 -0.86 -134 0 0 15 15 39 3 27 53.9 47 189 -9 14 56 42 15 34 42 14 52 39 15 38 48 -0.86 -133 0 0 15 33 15 3 28 0.6 46 190 -10 15 14 15 15 52 22 15 10 11 15 56 28 -0.86 -132 0 0 15 51 31 3 28 7.4 46 191 -11 15 32 27 16 10 41 15 28 22 16 14 49 -0.86 -131 0 0 16 10 27 3 28 14.1 45 192 -12 15 51 19 16 29 41 15 47 14 16 33 49 -0.86 -130 0 0 16 30 3 3 28 20.7 45 194 -13 16 10 51 16 49 21 16 6 44 16 53 30 -0.86 -129 0 0 16 50 18 3 28 27.3 44 195 -14 16 31 2 17 9 40 16 26 54 17 13 50 -0.86 -128 0 0 17 11 12 3 28 33.9 43 196 -15 16 51 51 17 30 38 16 47 43 17 34 49 -0.85 -127 0 0 17 32 44 3 28 40.3 43 197 -16 17 13 20 17 52 15 17 9 11 17 56 27 -0.85 -126 0 0 17 54 55 3 28 46.7 42 198 -17 17 35 26 18 14 30 17 31 16 18 18 43 -0.85 -125 0 0 18 17 44 3 28 53.1 42 199 -18 17 58 11 18 37 24 17 54 0 18 41 37 -0.85 -124 0 0 18 41 11 3 28 59.3 41 200 -19 18 21 33 19 0 55 18 17 21 19 5 10 -0.85 -123 0 0 19 5 15 3 29 5.5 40 201 -19 18 45 32 19 25 4 18 41 19 19 29 19 -0.85 -122 0 0 19 29 55 3 29 11.6 39 202 -20 19 10 8 19 49 49 19 5 54 19 54 6 -0.85 -121 0 0 19 55 12 3 29 17.6 39 203 -21 19 35 20 20 15 11 19 31 5 20 19 29 -0.85 -120 0 0 20 21 4 3 29 23.5 38 204 -22 20 1 7 20 41 8 19 56 51 20 45 27 -0.85 -119 0 0 20 47 32 3 29 29.3 37 205 -23 20 27 30 21 7 41 20 23 13 21 12 1 -0.85 -118 0 0 21 14 34 3 29 35.1 36 206 -24 20 54 27 21 34 48 20 50 9 21 39 10 -0.85 -117 0 0 21 42 10 3 29 40.7 35 207 -25 21 21 58 22 2 30 21 17 38 22 6 52 -0.85 -116 0 0 22 10 20 3 29 46.2 35 207 -25 21 50 2 22 30 45 21 45 41 22 35 8 -0.85 -115 0 0 22 39 2 3 29 51.5 34 208 -26 22 18 39 22 59 32 22 14 17 23 3 57 -0.85 -114 0 0 23 8 16 3 29 56.8 33 209 -27 22 47 47 23 28 52 22 43 24 23 33 18 -0.85 -113 0 0 23 38 1 3 30 2.0 32 210 -28 23 17 27 23 58 42 23 13 3 24 3 9 -0.85 -112 0 0 24 8 16 3 30 7.0 31 210 -29 23 47 36 24 29 3 23 43 11 24 33 31 -0.85 -111 0 0 24 39 1 3 30 11.9 30 211 -29 24 18 16 24 59 53 24 13 49 25 4 23 -0.85 -110 0 0 25 10 14 3 30 16.6 29 212 -30 24 49 23 25 31 13 24 44 56 25 35 43 -0.85 -109 0 0 25 41 55 3 30 21.2 28 213 -31 25 20 59 26 2 59 25 16 30 26 7 31 -0.85 -108 0 0 26 14 3 3 30 25.7 27 213 -32 25 53 1 26 35 13 25 48 31 26 39 46 -0.85 -107 0 0 26 46 36 3 30 30.0 26 214 -32 26 25 28 27 7 52 26 20 57 27 12 26 -0.85 -106 0 0 27 19 34 3 30 34.2 25 215 -33 26 58 21 27 40 56 26 53 49 27 45 31 -0.85 -105 0 0 27 52 56 3 30 38.3 24 215 -34 27 31 37 28 14 23 27 27 4 28 19 0 -0.85 -104 0 0 28 26 40 3 30 42.1 23 216 -34 28 5 15 28 48 13 28 0 41 28 52 51 -0.85 -103 0 0 29 0 46 3 30 45.9 22 217 -35 28 39 15 29 22 24 28 34 39 29 27 4 -0.85 -102 0 0 29 35 11 3 30 49.4 21 217 -35 29 13 35 29 56 55 29 8 58 30 1 36 -0.85 -101 0 0 30 9 56 3 30 52.8 20 218 -36 29 48 14 30 31 46 29 43 36 30 36 28 -0.85 -100 0 0 30 44 58 3 30 56.1 19 219 -36 30 23 11 31 6 53 30 18 32 31 11 37 -0.85 - 99 0 0 31 20 17 3 30 59.2 18 219 -37 30 58 24 31 42 18 30 53 44 31 47 2 -0.85 - 98 0 0 31 55 50 3 31 2.1 17 220 -37 31 33 53 32 17 57 31 29 11 32 22 42 -0.85 - 97 0 0 32 31 38 3 31 4.8 16 220 -38 32 9 35 32 53 49 32 4 52 32 58 36 -0.85 - 96 0 0 33 7 37 3 31 7.4 15 221 -38 32 45 29 33 29 55 32 40 45 33 34 43 -0.85 - 95 0 0 33 43 48 3 31 9.8 14 222 -39 33 21 35 34 6 11 33 16 50 34 11 0 -0.85 - 94 0 0 34 20 8 3 31 12.1 13 222 -39 33 57 50 34 42 36 33 53 4 34 47 26 -0.85 - 93 0 0 34 56 37 3 31 14.1 12 223 -39 34 34 14 35 19 9 34 29 27 35 24 1 -0.86 - 92 0 0 35 33 12 3 31 16.1 11 224 -40 35 10 44 35 55 49 35 5 56 36 0 42 -0.86 - 91 0 0 36 9 53 3 31 17.8 10 224 -40 35 47 20 36 32 35 35 42 31 36 37 28 -0.86 - 90 0 0 36 46 37 3 31 19.4 9 225 -40 36 24 0 37 9 24 36 19 10 37 14 18 -0.86 - 89 0 0 37 23 24 3 31 20.8 8 225 -40 37 0 42 37 46 15 36 55 51 37 51 10 -0.86 - 88 0 0 38 0 11 3 31 22.0 7 226 -40 37 37 26 38 23 6 37 32 34 38 28 3 -0.86 - 87 0 0 38 36 58 3 31 23.1 6 227 -41 38 14 9 38 59 57 38 9 16 39 4 55 -0.87 - 86 0 0 39 13 43 3 31 24.0 5 227 -41 38 50 50 39 36 46 38 45 57 39 41 44 -0.87 - 85 0 0 39 50 24 3 31 24.8 4 228 -41 39 27 28 40 13 31 39 22 34 40 18 30 -0.88 - 84 0 0 40 27 1 3 31 25.4 3 229 -41 40 4 1 40 50 11 39 59 6 40 55 11 -0.89 - 83 0 0 41 3 31 3 31 25.8 3 229 -41 40 40 28 41 26 44 40 35 32 41 31 45 -0.91 - 82 0 0 41 39 53 3 31 26.1 2 230 -41 41 16 47 42 3 10 41 11 51 42 8 11 -0.94 - 81 0 0 42 16 6 3 31 26.2 1 231 -41 41 52 58 42 39 26 41 48 1 42 44 27 -1.11 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 312-135447 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 01 08.4043 DE: -27 40 36.314 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 01 08.4043 DE: -27 40 36.314 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.6 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1135) Colchis asteroid class: approx. diameter [km]: 51 approx. diameter ["]: 0.032 distance from Earth [AU]: 2.22910 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#61 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", 0.003", 89.098° remarks: * orbital elements for (1135)Colchis : Mean anomaly = 310.5545360074 deg Arg. of pericenter = 3.6716496837 deg Long. of node = 350.6018849127 deg Inclination = 4.5404488853 deg Eccentricity = 0.1139006187 Semimajor axis = 2.6661800672 AU Perihelion dist = 2.3625005081 AU Mag: H = 10.60, G = 0.15 Epoch of elements : MJD 60573.14337141 TDT (2024 Sep 20.1434) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612023Apr24,3.16,2024,9,20,3.440920,-0.102082,0.642287,9.013256,1.429423,0.005541,0.000047,0.000000,0.000000 -140.4590,-27.6787,126.73,0.93,False UCAC4 312-135447,18.01900122,-27.6767539,11.78,11.63,11.55,0.0,0,,18.04489596,-27.6787129,3.83,3.47,0,0,0 1135,Colchis,15.43,51.030,2.2291,0,0,2.677,5.64,,2.8,0 0,310.5221,2024,9,20,3.6716,350.6019,4.5404,0.11390,2.66618,2.36250,10.59,5.0,0.15 1.107,0.0117,0.0030,89,0.0034,Known errors,0.76,0,-1,-1 20240920_135447,60140.57 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org