IOTA/IOTA-ES occultation update for (34) Circe / UCAC4 369-103082 event on 2023 Aug 18, 13:27 UT Visible from New Zealand, Australia, SE Asia, China Summary ------- On 2023 Aug 18 UT, the 118.5 km diameter asteroid (34) Circe will occult a 11.6 mag star in the constellation Sagittarius for observers along a path across New Zealand, Australia, SE Asia, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.11 mag to 13.58 mag (the magnitude of the asteroid) for at most 36.360 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: 2023 Aug 18, 12:55 - 2023 Aug 18, 13:58 * geocentric midpoint of event [JD]: 2460175.06055425 * magnitude of target star: 11.64 * magnitude drop [mag]: 2.11 * estimated maximum duration [s]: 36.360 * Moon: 4 % sunlit, 97° distance * Sun: 121° distance * rough path description: New Zealand, Australia, SE Asia, China Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 126 * 1 sigma uncertainty interval [path widths]: +/- 0.23 * 1 sigma uncertainty interval [seconds]: +/- 6.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.011) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.011", 90°) * approx speed of asteroid's shadow [km/s]: 3.2590 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 369-103082 by 34 Circe on 2023 Aug 18 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 75 0 0 .. .. .... .. .. .. .. .. .. 68 35 54 .. .. .. 68 5 56 .. .. .. .... 76 0 1 69 5 14 12 56 35.2 2 152 12 67 56 57 70 14 29 67 26 19 .. .. .. .... 77 0 1 68 25 29 12 56 36.3 3 152 12 67 15 40 69 36 17 66 44 22 70 8 41 -0.23 78 0 1 67 43 17 12 56 37.9 4 153 12 66 31 54 68 55 42 65 59 55 69 28 51 -0.24 79 0 1 66 58 28 12 56 40.0 4 154 11 65 45 28 68 12 33 65 12 46 68 46 29 -0.25 80 0 1 66 10 51 12 56 42.7 5 155 11 64 56 11 67 26 39 64 22 45 68 1 23 -0.26 81 0 1 65 20 12 12 56 46.2 6 156 10 64 3 50 66 37 48 63 29 38 67 13 21 -0.26 82 0 1 64 26 20 12 56 50.4 7 157 9 63 8 12 65 45 45 62 33 12 66 22 9 -0.26 83 0 1 63 28 59 12 56 55.6 8 158 9 62 9 2 64 50 16 61 33 14 65 27 32 -0.27 84 0 1 62 27 54 12 57 1.8 9 159 8 61 6 5 63 51 6 60 29 28 64 29 15 -0.27 85 0 1 61 22 49 12 57 9.3 11 160 7 59 59 7 62 47 58 59 21 39 63 27 2 -0.27 86 0 0 60 13 27 12 57 18.2 12 161 7 58 47 49 61 40 36 58 9 30 62 20 35 -0.27 87 0 0 58 59 31 12 57 28.7 13 162 6 57 31 54 60 28 41 56 52 43 61 9 36 -0.27 88 0 0 57 40 41 12 57 41.1 15 163 5 56 11 5 59 11 54 55 31 0 59 53 46 -0.27 89 0 0 56 16 38 12 57 55.7 16 164 4 54 45 2 57 49 55 54 4 3 58 32 44 -0.27 90 0 0 54 47 4 12 58 12.7 18 165 3 53 13 27 56 22 24 52 31 35 57 6 11 -0.26 91 0 0 53 11 39 12 58 32.5 20 165 2 51 36 1 54 49 3 50 53 15 55 33 46 -0.26 92 0 0 51 30 5 12 58 55.4 21 166 1 49 52 28 53 9 30 49 8 48 53 55 9 -0.26 93 0 0 49 42 3 12 59 21.9 23 167 -1 48 2 29 51 23 28 47 17 58 52 10 2 -0.26 94 0 0 47 47 19 12 59 52.3 25 168 -2 46 5 52 49 30 39 45 20 30 50 18 6 -0.26 95 0 0 45 45 40 13 0 27.2 27 169 -4 44 2 25 47 30 49 43 16 15 48 19 7 -0.26 96 0 0 43 36 58 13 1 6.8 30 170 -5 41 52 3 45 23 50 41 5 8 46 12 54 -0.26 97 0 0 41 21 11 13 1 51.8 32 172 -7 39 34 45 43 9 35 38 47 9 43 59 21 -0.26 98 0 0 38 58 22 13 2 42.4 35 173 -9 37 10 39 40 48 7 36 22 29 41 38 30 -0.26 99 0 0 36 28 49 13 3 39.0 37 174 -11 34 40 3 38 19 37 33 51 27 39 10 30 -0.26 100 0 0 33 52 55 13 4 41.7 40 175 -13 32 3 28 35 44 29 31 14 33 36 35 43 -0.26 101 0 0 31 11 21 13 5 50.8 43 177 -15 29 21 34 33 3 16 28 32 31 33 54 41 -0.26 102 0 0 28 24 56 13 7 5.9 45 179 -17 26 35 16 30 16 48 25 46 18 31 8 13 -0.27 103 0 0 25 34 47 13 8 26.8 48 180 -19 23 45 42 27 26 6 22 57 1 28 17 17 -0.27 104 0 0 22 42 9 13 9 53.0 51 182 -22 20 54 10 24 32 26 20 6 0 25 23 9 -0.27 105 0 0 19 48 26 13 11 23.6 54 185 -24 18 2 2 21 37 10 17 14 36 22 27 11 -0.28 106 0 0 16 55 6 13 12 57.8 57 188 -26 15 10 46 18 41 47 14 24 16 19 30 54 -0.29 107 0 0 14 3 35 13 14 34.4 59 191 -29 12 21 43 15 47 48 11 36 19 16 35 47 -0.29 108 0 0 11 15 13 13 16 12.5 62 195 -31 9 36 8 12 56 35 8 52 0 13 43 17 -0.30 109 0 0 8 31 8 13 17 50.8 64 199 -34 6 55 5 10 9 24 6 12 18 10 54 40 -0.31 110 0 0 5 52 16 13 19 28.6 66 204 -36 4 19 25 7 27 16 3 38 3 8 11 0 -0.32 111 0 0 3 19 18 13 21 4.9 67 210 -38 1 49 43 4 50 56 1 9 48 5 33 7 -0.32 112 0 0 0 52 43 13 22 39.0 69 216 -40 - 0 33 36 2 20 59 - 1 12 4 3 1 36 -0.33 113 0 0 - 1 27 13 13 24 10.4 70 222 -42 - 2 50 20 - 0 2 18 - 3 27 24 0 36 46 -0.34 114 0 0 - 3 40 27 13 25 38.8 70 229 -44 - 5 0 28 - 2 18 45 - 5 36 9 - 1 41 11 -0.35 115 0 0 - 5 46 59 13 27 4.0 70 236 -46 - 7 4 2 - 4 28 23 - 7 38 25 - 3 52 16 -0.35 116 0 0 - 7 47 0 13 28 25.7 70 243 -48 - 9 1 13 - 6 31 20 - 9 34 21 - 5 56 35 -0.36 117 0 0 - 9 40 41 13 29 43.9 70 249 -49 -10 52 14 - 8 27 48 -11 24 12 - 7 54 21 -0.37 118 0 0 -11 28 20 13 30 58.6 69 254 -51 -12 37 23 -10 18 3 -13 8 14 - 9 45 49 -0.37 119 0 0 -13 10 13 13 32 9.9 68 259 -52 -14 16 54 -12 2 23 -14 46 44 -11 31 17 -0.38 120 0 0 -14 46 38 13 33 17.9 67 263 -53 -15 51 8 -13 41 5 -16 20 0 -13 11 3 -0.38 121 0 0 -16 17 53 13 34 22.8 66 266 -55 -17 20 21 -15 14 28 -17 48 19 -14 45 25 -0.39 122 0 0 -17 44 17 13 35 24.5 65 269 -56 -18 44 50 -16 42 50 -19 11 58 -16 14 43 -0.39 123 0 0 -19 6 6 13 36 23.4 64 271 -57 -20 4 53 -18 6 30 -20 31 13 -17 39 15 -0.39 124 0 0 -20 23 37 13 37 19.5 63 274 -58 -21 20 44 -19 25 44 -21 46 21 -18 59 17 -0.40 125 0 0 -21 37 6 13 38 13.0 61 275 -59 -22 32 40 -20 40 49 -22 57 36 -20 15 6 -0.40 126 0 0 -22 46 46 13 39 4.0 60 277 -60 -23 40 54 -21 51 59 -24 5 12 -21 26 57 -0.40 127 0 0 -23 52 52 13 39 52.6 59 278 -61 -24 45 40 -22 59 28 -25 9 22 -22 35 5 -0.40 128 0 0 -24 55 37 13 40 39.0 58 279 -61 -25 47 9 -24 3 31 -26 10 17 -23 39 44 -0.41 129 0 0 -25 55 11 13 41 23.4 57 279 -62 -26 45 33 -25 4 18 -27 8 10 -24 41 5 -0.41 130 0 0 -26 51 47 13 42 5.8 55 280 -62 -27 41 2 -26 2 1 -28 3 10 -25 39 19 -0.41 131 0 0 -27 45 33 13 42 46.3 54 280 -63 -28 33 47 -26 56 51 -28 55 28 -26 34 39 -0.41 132 0 0 -28 36 40 13 43 25.1 53 281 -63 -29 23 56 -27 48 58 -29 45 12 -27 27 13 -0.41 133 0 0 -29 25 16 13 44 2.2 52 281 -64 -30 11 38 -28 38 30 -30 32 29 -28 17 11 -0.41 134 0 0 -30 11 29 13 44 37.7 51 281 -64 -30 57 0 -29 25 35 -31 17 29 -29 4 40 -0.41 135 0 0 -30 55 27 13 45 11.8 50 281 -65 -31 40 10 -30 10 22 -32 0 18 -29 49 50 -0.41 136 0 0 -31 37 16 13 45 44.5 48 281 -65 -32 21 14 -30 52 57 -32 41 2 -30 32 46 -0.41 137 0 0 -32 17 3 13 46 15.8 47 281 -65 -33 0 19 -31 33 27 -33 19 48 -31 13 36 -0.41 138 0 0 -32 54 54 13 46 45.9 46 281 -65 -33 37 30 -32 11 59 -33 56 41 -31 52 27 -0.41 139 0 0 -33 30 53 13 47 14.8 45 281 -65 -34 12 52 -32 48 37 -34 31 46 -32 29 22 -0.41 140 0 0 -34 5 7 13 47 42.6 44 281 -65 -34 46 30 -33 23 26 -35 5 9 -33 4 29 -0.41 141 0 0 -34 37 40 13 48 9.3 43 280 -65 -35 18 30 -33 56 33 -35 36 54 -33 37 51 -0.41 142 0 0 -35 8 36 13 48 35.0 42 280 -65 -35 48 55 -34 28 1 -36 7 5 -34 9 34 -0.41 143 0 0 -35 37 59 13 48 59.8 41 280 -65 -36 17 48 -34 57 54 -36 35 45 -34 39 41 -0.41 144 0 0 -36 5 53 13 49 23.6 40 279 -65 -36 45 15 -35 26 17 -37 2 59 -35 8 16 -0.41 145 0 0 -36 32 22 13 49 46.6 39 279 -65 -37 11 17 -35 53 12 -37 28 50 -35 35 24 -0.41 146 0 0 -36 57 28 13 50 8.7 39 278 -65 -37 35 59 -36 18 44 -37 53 21 -36 1 8 -0.41 147 0 0 -37 21 16 13 50 30.0 38 278 -65 -37 59 24 -36 42 55 -38 16 35 -36 25 30 -0.41 148 0 0 -37 43 47 13 50 50.5 37 278 -65 -38 21 33 -37 5 49 -38 38 35 -36 48 33 -0.40 149 0 0 -38 5 4 13 51 10.4 36 277 -65 -38 42 30 -37 27 27 -38 59 22 -37 10 22 -0.40 150 0 0 -38 25 11 13 51 29.5 35 277 -65 -39 2 17 -37 47 53 -39 19 1 -37 30 56 -0.40 151 0 0 -38 44 8 13 51 48.0 34 276 -64 -39 20 56 -38 7 9 -39 37 32 -37 50 20 -0.40 152 0 0 -39 1 58 13 52 5.8 33 275 -64 -39 38 29 -38 25 16 -39 54 57 -38 8 36 -0.40 153 0 0 -39 18 43 13 52 23.0 32 275 -64 -39 54 58 -38 42 18 -40 11 20 -38 25 45 -0.40 154 0 0 -39 34 26 13 52 39.6 31 274 -64 -40 10 26 -38 58 15 -40 26 40 -38 41 50 -0.40 155 0 0 -39 49 6 13 52 55.6 31 274 -63 -40 24 53 -39 13 10 -40 41 1 -38 56 51 -0.39 156 0 0 -40 2 47 13 53 11.1 30 273 -63 -40 38 21 -39 27 5 -40 54 23 -39 10 51 -0.39 157 0 0 -40 15 30 13 53 26.0 29 273 -63 -40 50 51 -39 39 59 -41 6 48 -39 23 52 -0.39 158 0 0 -40 27 16 13 53 40.4 28 272 -62 -41 2 26 -39 51 56 -41 18 18 -39 35 54 -0.39 159 0 0 -40 38 5 13 53 54.4 27 271 -62 -41 13 5 -40 2 57 -41 28 53 -39 46 59 -0.39 160 0 0 -40 48 0 13 54 7.8 27 271 -62 -41 22 51 -40 13 2 -41 38 34 -39 57 9 -0.39 161 0 0 -40 57 2 13 54 20.8 26 270 -61 -41 31 43 -40 22 12 -41 47 23 -40 6 23 -0.38 162 0 0 -41 5 11 13 54 33.3 25 270 -61 -41 39 44 -40 30 29 -41 55 20 -40 14 44 -0.38 163 0 0 -41 12 28 13 54 45.4 24 269 -60 -41 46 54 -40 37 54 -42 2 27 -40 22 12 -0.38 164 0 0 -41 18 54 13 54 57.0 23 268 -60 -41 53 14 -40 44 26 -42 8 44 -40 28 48 -0.38 165 0 0 -41 24 30 13 55 8.2 23 268 -60 -41 58 44 -40 50 8 -42 14 12 -40 34 32 -0.38 166 0 0 -41 29 17 13 55 19.1 22 267 -59 -42 3 26 -40 55 0 -42 18 51 -40 39 26 -0.38 167 0 0 -41 33 14 13 55 29.5 21 266 -59 -42 7 19 -40 59 2 -42 22 42 -40 43 30 -0.37 168 0 0 -41 36 23 13 55 39.5 20 266 -58 -42 10 24 -41 2 15 -42 25 46 -40 46 45 -0.37 169 0 0 -41 38 44 13 55 49.1 20 265 -58 -42 12 42 -41 4 39 -42 28 2 -40 49 10 -0.37 170 0 0 -41 40 17 13 55 58.3 19 264 -57 -42 14 13 -41 6 14 -42 29 32 -40 50 47 -0.37 171 0 0 -41 41 3 13 56 7.2 18 264 -57 -42 14 57 -41 7 2 -42 30 15 -40 51 36 -0.37 172 0 0 -41 41 2 13 56 15.7 17 263 -56 -42 14 55 -41 7 2 -42 30 13 -40 51 37 -0.37 173 0 0 -41 40 15 13 56 23.8 16 262 -56 -42 14 7 -41 6 15 -42 29 24 -40 50 50 -0.36 174 0 0 -41 38 40 13 56 31.5 16 262 -56 -42 12 32 -41 4 41 -42 27 50 -40 49 15 -0.36 175 0 0 -41 36 19 13 56 38.9 15 261 -55 -42 10 12 -41 2 19 -42 25 30 -40 46 53 -0.36 176 0 0 -41 33 11 13 56 45.9 14 261 -55 -42 7 5 -40 59 10 -42 22 24 -40 43 44 -0.36 177 0 0 -41 29 17 13 56 52.6 13 260 -54 -42 3 13 -40 55 14 -42 18 33 -40 39 47 -0.36 178 0 0 -41 24 37 13 56 58.9 13 259 -54 -41 58 35 -40 50 31 -42 13 55 -40 35 3 -0.35 179 0 0 -41 19 9 13 57 4.9 12 259 -53 -41 53 11 -40 45 1 -42 8 32 -40 29 31 -0.35 180 0 0 -41 12 55 13 57 10.4 11 258 -53 -41 47 0 -40 38 43 -42 2 23 -40 23 12 -0.35 -179 0 0 -41 5 54 13 57 15.7 10 257 -52 -41 40 3 -40 31 38 -41 55 28 -40 16 5 -0.35 -178 0 0 -40 58 5 13 57 20.5 9 257 -52 -41 32 19 -40 23 44 -41 47 46 -40 8 9 -0.35 -177 0 0 -40 49 29 13 57 25.1 9 256 -51 -41 23 48 -40 15 3 -41 39 18 -39 59 25 -0.35 -176 0 0 -40 40 5 13 57 29.2 8 255 -50 -41 14 30 -40 5 33 -41 30 2 -39 49 52 -0.35 -175 0 0 -40 29 52 13 57 33.0 7 255 -50 -41 4 23 -39 55 14 -41 19 59 -39 39 31 -0.34 -174 0 0 -40 18 51 13 57 36.3 6 254 -49 -40 53 29 -39 44 5 -41 9 8 -39 28 19 -0.34 -173 0 0 -40 7 0 13 57 39.4 6 253 -49 -40 41 46 -39 32 7 -40 57 28 -39 16 17 -0.34 -172 0 0 -39 54 20 13 57 42.0 5 253 -48 -40 29 14 -39 19 18 -40 44 59 -39 3 25 -0.34 -171 0 0 -39 40 49 13 57 44.2 4 252 -48 -40 15 51 -39 5 39 -40 31 41 -38 49 41 -0.34 -170 0 0 -39 26 27 13 57 46.0 3 251 -47 -40 1 39 -38 51 8 -40 17 32 -38 35 6 -0.34 -169 0 0 -39 11 13 13 57 47.5 2 251 -47 -39 46 35 -38 35 44 -40 2 33 -38 19 38 -0.35 -168 0 0 -38 55 7 13 57 48.5 1 250 -46 -39 30 39 -38 19 28 -39 46 42 -38 3 17 -0.36 -167 0 0 -38 38 8 13 57 49.0 1 249 -45 -39 13 51 -38 2 17 -39 29 59 -37 46 1 -0.40 -166 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -39 12 22 .. .. .. .... Uncertainty in time = +/- 9 secs Prediction of 2023 Aug 6.7 Data for the target star ------------------------ * name: UCAC4 369-103082 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 44 38.8213 DE: -16 20 33.199 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 44 38.8211 DE: -16 20 33.199 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.800,0.500) * V mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (34) Circe asteroid class: approx. diameter [km]: 119 approx. diameter ["]: 0.074 distance from Earth [AU]: 2.19360 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#105 date of fit: 2023 Jul 30 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): 0.018", 0.011", 90.09° remarks: * orbital elements for (34)Circe : Mean anomaly = 119.8189280608 deg Arg. of pericenter = 329.9651331350 deg Long. of node = 184.3312435397 deg Inclination = 5.4973877109 deg Eccentricity = 0.1066378174 Semimajor axis = 2.6864629050 AU Perihelion dist = 2.3999843644 AU Mag: H = 8.80, G = 0.15 Epoch of elements : MJD 60174.56062500 TDT (2023 Aug 18.5606) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1052023Jul30,36.36,2023,8,18,13.453302,0.291559,0.168461,0.921824,-1.591838,0.004821,-0.000477,0.000001,0.000000 98.0491,-16.3527,-20.82,13.06,False UCAC4 369-103082,17.74411705,-16.3425554,0.00,11.64,0.00,0.0,0,,17.76693364,-16.3527189,2.10,0.00,0,0,0 34,Circe,13.58,118.500,2.1936,0,0,0.257,-6.38,,5.8,0 0,119.6934,2023,8,18,329.9651,184.3312,5.4974,0.10664,2.68646,2.39998,8.67,5.0,0.15 1.226,0.0184,0.0113,90,0.0216,Known errors,-1.00,0,-1,-1 20230818_103082,60162.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 06, 16:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org