IOTA/IOTA-ES occultation update for (267) Tirza / UCAC4-569-029510 event on 2023 Sep 28, 19:23 UT Visible from Australia Summary ------- On 2023 Sep 28 UT, the 53 km diameter asteroid (267) Tirza will occult a 12.2 mag star in the constellation Gemini for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.89 mag to 16.01 mag (the magnitude of the asteroid) for at most 3.340 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: 100 * date and approx. time of event: 2023 Sep 28, 19:18 - 2023 Sep 28, 19:27 * geocentric midpoint of event [JD]: 2460216.30763771 * magnitude of target star: 12.15 * magnitude drop [mag]: 3.89 * estimated maximum duration [s]: 3.340 * Moon: 99 % sunlit, 100° distance * Sun: 88° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 79 * 1 sigma uncertainty interval [path widths]: +/- 0.01 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.000) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.000", 87°) * approx speed of asteroid's shadow [km/s]: 15.8466 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-569-029510 by 267 Tirza on 2023 Sep 28 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 98 59 59 -45 54 1 19 18 31.9 0 54 -35 -46 20 19 -45 28 0 -46 21 0 -45 27 20 .... 99 59 59 -45 24 17 19 18 32.1 1 54 -35 -45 50 30 -44 58 20 -45 51 11 -44 57 39 0.56 100 59 59 -44 54 32 19 18 32.3 2 53 -35 -45 20 40 -44 28 40 -45 21 21 -44 27 59 0.77 101 59 59 -44 24 48 19 18 32.7 3 52 -35 -44 50 52 -43 59 1 -44 51 33 -43 58 21 0.86 102 59 59 -43 55 7 19 18 33.3 4 51 -34 -44 21 5 -43 29 24 -44 21 46 -43 28 44 0.91 104 0 0 -43 25 29 19 18 34.0 5 51 -34 -43 51 22 -42 59 51 -43 52 3 -42 59 11 0.95 105 0 0 -42 55 55 19 18 34.8 6 50 -34 -43 21 43 -42 30 22 -43 22 23 -42 29 42 0.97 106 0 0 -42 26 26 19 18 35.8 7 49 -34 -42 52 9 -42 0 58 -42 52 49 -42 0 19 0.99 107 0 0 -41 57 4 19 18 36.9 7 49 -34 -42 22 41 -41 31 41 -42 23 22 -41 31 2 1.00 108 0 0 -41 27 49 19 18 38.2 8 48 -33 -41 53 21 -41 2 32 -41 54 2 -41 1 53 1.01 109 0 0 -40 58 43 19 18 39.6 9 47 -33 -41 24 10 -40 33 31 -41 24 50 -40 32 52 1.02 110 0 0 -40 29 47 19 18 41.2 10 47 -33 -40 55 8 -40 4 41 -40 55 48 -40 4 2 1.03 111 0 0 -40 1 1 19 18 42.9 11 46 -32 -40 26 17 -39 36 0 -40 26 56 -39 35 21 1.04 112 0 0 -39 32 27 19 18 44.8 12 45 -32 -39 57 37 -39 7 32 -39 58 16 -39 6 53 1.04 113 0 0 -39 4 6 19 18 46.9 13 45 -32 -39 29 10 -38 39 16 -39 29 49 -38 38 38 1.05 114 0 0 -38 35 59 19 18 49.1 14 44 -31 -39 0 57 -38 11 14 -39 1 36 -38 10 36 1.05 115 0 0 -38 8 6 19 18 51.4 15 43 -31 -38 32 58 -37 43 27 -38 33 37 -37 42 49 1.05 116 0 0 -37 40 28 19 18 53.9 15 42 -30 -38 5 15 -37 15 56 -38 5 54 -37 15 18 1.06 117 0 0 -37 13 8 19 18 56.5 16 42 -30 -37 37 48 -36 48 41 -37 38 27 -36 48 3 1.06 118 0 0 -36 46 5 19 18 59.3 17 41 -29 -37 10 40 -36 21 43 -37 11 18 -36 21 5 1.06 119 0 0 -36 19 20 19 19 2.3 18 40 -29 -36 43 49 -35 55 4 -36 44 27 -35 54 27 1.06 120 0 0 -35 52 55 19 19 5.4 19 40 -28 -36 17 18 -35 28 45 -36 17 56 -35 28 7 1.07 121 0 0 -35 26 49 19 19 8.6 20 39 -28 -35 51 7 -35 2 45 -35 51 45 -35 2 7 1.07 122 0 0 -35 1 5 19 19 12.0 21 38 -27 -35 25 17 -34 37 6 -35 25 55 -34 36 29 1.07 123 0 0 -34 35 43 19 19 15.5 21 38 -27 -34 59 49 -34 11 49 -35 0 26 -34 11 12 1.07 124 0 0 -34 10 43 19 19 19.2 22 37 -26 -34 34 43 -33 46 55 -34 35 21 -33 46 18 1.08 125 0 0 -33 46 6 19 19 23.0 23 36 -25 -34 10 1 -33 22 23 -34 10 38 -33 21 47 1.08 126 0 0 -33 21 54 19 19 26.9 24 35 -25 -33 45 43 -32 58 16 -33 46 20 -32 57 40 1.08 127 0 0 -32 58 6 19 19 31.0 25 34 -24 -33 21 50 -32 34 34 -33 22 27 -32 33 57 1.08 128 0 0 -32 34 44 19 19 35.2 26 34 -23 -32 58 22 -32 11 17 -32 58 59 -32 10 41 1.08 129 0 0 -32 11 48 19 19 39.5 26 33 -23 -32 35 21 -31 48 27 -32 35 58 -31 47 50 1.08 130 0 0 -31 49 19 19 19 44.0 27 32 -22 -32 12 46 -31 26 3 -32 13 23 -31 25 26 1.09 131 0 0 -31 27 17 19 19 48.5 28 31 -21 -31 50 39 -31 4 6 -31 51 16 -31 3 30 1.09 132 0 0 -31 5 43 19 19 53.2 29 30 -21 -31 29 1 -30 42 37 -31 29 37 -30 42 1 1.09 133 0 0 -30 44 38 19 19 58.0 29 30 -20 -31 7 51 -30 21 37 -31 8 27 -30 21 1 1.09 134 0 0 -30 24 2 19 20 3.0 30 29 -19 -30 47 10 -30 1 5 -30 47 46 -30 0 30 1.09 135 0 0 -30 3 56 19 20 8.0 31 28 -18 -30 26 59 -29 41 4 -30 27 35 -29 40 28 1.09 136 0 0 -29 44 20 19 20 13.1 32 27 -18 -30 7 18 -29 21 32 -30 7 54 -29 20 57 1.09 137 0 0 -29 25 14 19 20 18.4 32 26 -17 -29 48 8 -29 2 31 -29 48 44 -29 1 56 1.09 138 0 0 -29 6 40 19 20 23.7 33 25 -16 -29 29 29 -28 44 2 -29 30 5 -28 43 26 1.10 139 0 0 -28 48 37 19 20 29.2 34 24 -15 -29 11 22 -28 26 3 -29 11 58 -28 25 28 1.10 140 0 0 -28 31 7 19 20 34.7 34 23 -14 -28 53 47 -28 8 37 -28 54 23 -28 8 2 1.10 141 0 0 -28 14 8 19 20 40.3 35 22 -13 -28 36 45 -27 51 42 -28 37 20 -27 51 7 1.10 142 0 0 -27 57 43 19 20 46.0 35 21 -13 -28 20 15 -27 35 21 -28 20 51 -27 34 46 1.10 143 0 0 -27 41 50 19 20 51.8 36 20 -12 -28 4 19 -27 19 32 -28 4 54 -27 18 57 1.10 144 0 0 -27 26 31 19 20 57.7 36 19 -11 -27 48 56 -27 4 17 -27 49 32 -27 3 42 1.10 145 0 0 -27 11 46 19 21 3.6 37 18 -10 -27 34 8 -26 49 35 -27 34 43 -26 49 0 1.10 146 0 0 -26 57 35 19 21 9.6 37 17 -9 -27 19 53 -26 35 27 -27 20 28 -26 34 53 1.10 147 0 0 -26 43 58 19 21 15.7 38 16 -8 -27 6 13 -26 21 53 -27 6 48 -26 21 19 1.10 148 0 0 -26 30 56 19 21 21.8 38 15 -7 -26 53 8 -26 8 54 -26 53 42 -26 8 20 1.11 149 0 0 -26 18 29 19 21 28.0 39 14 -6 -26 40 37 -25 56 30 -26 41 12 -25 55 56 1.11 150 0 0 -26 6 37 19 21 34.2 39 13 -6 -26 28 42 -25 44 41 -26 29 17 -25 44 7 1.11 151 0 0 -25 55 20 19 21 40.5 40 11 -5 -26 17 23 -25 33 27 -26 17 57 -25 32 53 1.11 152 0 0 -25 44 39 19 21 46.9 40 10 -4 -26 6 39 -25 22 48 -26 7 13 -25 22 14 1.11 153 0 0 -25 34 33 19 21 53.2 40 9 -3 -25 56 31 -25 12 45 -25 57 5 -25 12 11 1.11 154 0 0 -25 25 4 19 21 59.7 41 8 -2 -25 46 59 -25 3 18 -25 47 33 -25 2 44 1.11 155 0 0 -25 16 10 19 22 6.1 41 7 -1 -25 38 3 -24 54 27 -25 38 38 -24 53 53 1.11 156 0 0 -25 7 53 19 22 12.6 41 5 0 -25 29 44 -24 46 11 -25 30 18 -24 45 37 1.11 157 0 0 -25 0 12 19 22 19.1 41 4 1 -25 22 1 -24 38 32 -25 22 35 -24 37 58 1.11 158 0 0 -24 53 7 19 22 25.6 41 3 2 -25 14 55 -24 31 29 -25 15 29 -24 30 56 1.11 159 0 0 -24 46 39 19 22 32.2 42 2 3 -25 8 25 -24 25 3 -25 8 59 -24 24 29 1.11 160 0 0 -24 40 48 19 22 38.8 42 0 4 -25 2 32 -24 19 13 -25 3 6 -24 18 39 1.11 161 0 0 -24 35 34 19 22 45.3 42 359 5 -24 57 17 -24 14 0 -24 57 51 -24 13 26 1.11 162 0 0 -24 30 56 19 22 51.9 42 358 5 -24 52 38 -24 9 23 -24 53 12 -24 8 50 1.11 163 0 0 -24 26 55 19 22 58.5 42 357 6 -24 48 36 -24 5 24 -24 49 10 -24 4 50 1.12 164 0 0 -24 23 32 19 23 5.1 42 355 7 -24 45 11 -24 2 1 -24 45 45 -24 1 27 1.12 165 0 0 -24 20 45 19 23 11.7 42 354 8 -24 42 24 -23 59 15 -24 42 58 -23 58 41 1.12 166 0 0 -24 18 35 19 23 18.3 42 353 9 -24 40 14 -23 57 5 -24 40 48 -23 56 32 1.12 167 0 0 -24 17 2 19 23 24.8 42 352 10 -24 38 40 -23 55 33 -24 39 14 -23 55 0 1.12 168 0 0 -24 16 7 19 23 31.4 42 350 11 -24 37 45 -23 54 38 -24 38 19 -23 54 4 1.12 169 0 0 -24 15 48 19 23 37.9 41 349 12 -24 37 26 -23 54 20 -24 38 0 -23 53 46 1.12 170 0 0 -24 16 7 19 23 44.4 41 348 13 -24 37 45 -23 54 38 -24 38 19 -23 54 5 1.12 171 0 0 -24 17 3 19 23 50.9 41 347 14 -24 38 41 -23 55 34 -24 39 15 -23 55 0 1.12 172 0 0 -24 18 35 19 23 57.3 41 345 15 -24 40 14 -23 57 6 -24 40 48 -23 56 33 1.12 173 0 0 -24 20 45 19 24 3.7 40 344 16 -24 42 24 -23 59 15 -24 42 58 -23 58 42 1.12 174 0 0 -24 23 32 19 24 10.1 40 343 17 -24 45 11 -24 2 1 -24 45 45 -24 1 28 1.12 175 0 0 -24 26 55 19 24 16.4 40 342 18 -24 48 36 -24 5 24 -24 49 10 -24 4 51 1.12 176 0 0 -24 30 56 19 24 22.7 39 341 19 -24 52 37 -24 9 24 -24 53 11 -24 8 50 1.12 177 0 0 -24 35 33 19 24 29.0 39 340 19 -24 57 15 -24 14 0 -24 57 49 -24 13 26 1.12 178 0 0 -24 40 47 19 24 35.1 39 339 20 -25 2 30 -24 19 13 -25 3 5 -24 18 39 1.12 179 0 0 -24 46 37 19 24 41.3 38 338 21 -25 8 22 -24 25 2 -25 8 56 -24 24 28 1.12 180 0 0 -24 53 4 19 24 47.3 38 336 22 -25 14 51 -24 31 27 -25 15 25 -24 30 54 1.12 -179 0 0 -25 0 8 19 24 53.3 37 335 23 -25 21 56 -24 38 29 -25 22 30 -24 37 55 1.12 -178 0 0 -25 7 47 19 24 59.3 37 334 24 -25 29 37 -24 46 7 -25 30 11 -24 45 33 1.12 -177 0 0 -25 16 3 19 25 5.1 36 333 25 -25 37 55 -24 54 20 -25 38 29 -24 53 46 1.12 -176 0 0 -25 24 55 19 25 10.9 36 332 26 -25 46 49 -25 3 10 -25 47 23 -25 2 36 1.12 -175 0 0 -25 34 22 19 25 16.6 35 331 27 -25 56 18 -25 12 36 -25 56 53 -25 12 2 1.12 -174 0 0 -25 44 25 19 25 22.3 34 330 28 -26 6 23 -25 22 36 -26 6 58 -25 22 2 1.12 -173 0 0 -25 55 3 19 25 27.8 34 330 28 -26 17 4 -25 33 12 -26 17 39 -25 32 38 1.12 -172 0 0 -26 6 17 19 25 33.3 33 329 29 -26 28 21 -25 44 23 -26 28 55 -25 43 48 1.12 -171 0 0 -26 18 5 19 25 38.6 33 328 30 -26 40 12 -25 56 8 -26 40 47 -25 55 34 1.12 -170 0 0 -26 30 29 19 25 43.9 32 327 31 -26 52 38 -26 8 29 -26 53 13 -26 7 54 1.12 -169 0 0 -26 43 26 19 25 49.1 31 326 32 -27 5 39 -26 21 23 -27 6 14 -26 20 49 1.12 -168 0 0 -26 56 58 19 25 54.1 31 325 33 -27 19 14 -26 34 52 -27 19 49 -26 34 18 1.12 -167 0 0 -27 11 4 19 25 59.1 30 324 33 -27 33 23 -26 48 55 -27 33 58 -26 48 20 1.12 -166 0 0 -27 25 44 19 26 3.9 29 324 34 -27 48 6 -27 3 31 -27 48 42 -27 2 56 1.12 -165 0 0 -27 40 57 19 26 8.7 28 323 35 -28 3 23 -27 18 40 -28 3 58 -27 18 6 1.12 -164 0 0 -27 56 43 19 26 13.3 28 322 36 -28 19 13 -27 34 23 -28 19 48 -27 33 48 1.12 -163 0 0 -28 13 1 19 26 17.8 27 321 36 -28 35 35 -27 50 37 -28 36 10 -27 50 3 1.12 -162 0 0 -28 29 52 19 26 22.2 26 321 37 -28 52 30 -28 7 24 -28 53 5 -28 6 49 1.12 -161 0 0 -28 47 15 19 26 26.5 25 320 38 -29 9 57 -28 24 43 -29 10 32 -28 24 8 1.12 -160 0 0 -29 5 9 19 26 30.6 24 319 39 -29 27 55 -28 42 33 -29 28 31 -28 41 58 1.12 -159 0 0 -29 23 35 19 26 34.7 24 318 39 -29 46 25 -29 0 55 -29 47 1 -29 0 19 1.12 -158 0 0 -29 42 31 19 26 38.5 23 318 40 -30 5 26 -29 19 46 -30 6 2 -29 19 11 1.12 -157 0 0 -30 1 57 19 26 42.3 22 317 41 -30 24 57 -29 39 8 -30 25 33 -29 38 33 1.12 -156 0 0 -30 21 53 19 26 45.9 21 316 41 -30 44 57 -29 59 0 -30 45 34 -29 58 24 1.12 -155 0 0 -30 42 18 19 26 49.4 20 316 42 -31 5 27 -30 19 20 -31 6 4 -30 18 45 1.12 -154 0 0 -31 3 13 19 26 52.7 19 315 43 -31 26 26 -30 40 10 -31 27 3 -30 39 34 1.12 -153 0 0 -31 24 35 19 26 55.9 19 314 43 -31 47 54 -31 1 27 -31 48 30 -31 0 51 1.12 -152 0 0 -31 46 25 19 26 59.0 18 314 44 -32 9 48 -31 23 12 -32 10 25 -31 22 36 1.12 -151 0 0 -32 8 41 19 27 1.9 17 313 44 -32 32 10 -31 45 24 -32 32 47 -31 44 48 1.12 -150 0 0 -32 31 25 19 27 4.6 16 312 45 -32 54 59 -32 8 2 -32 55 36 -32 7 26 1.12 -149 0 0 -32 54 34 19 27 7.3 15 312 45 -33 18 13 -32 31 6 -33 18 50 -32 30 29 1.12 -148 0 0 -33 18 8 19 27 9.7 14 311 46 -33 41 53 -32 54 35 -33 42 30 -32 53 58 1.12 -147 0 0 -33 42 7 19 27 12.0 13 311 46 -34 5 57 -33 18 28 -34 6 34 -33 17 51 1.12 -146 0 0 -34 6 29 19 27 14.2 12 310 46 -34 30 25 -33 42 45 -34 31 3 -33 42 8 1.12 -145 0 0 -34 31 15 19 27 16.2 11 309 47 -34 55 16 -34 7 26 -34 55 54 -34 6 48 1.13 -144 0 0 -34 56 22 19 27 18.0 10 309 47 -35 20 30 -34 32 28 -35 21 7 -34 31 51 1.13 -143 0 0 -35 21 52 19 27 19.7 10 308 47 -35 46 5 -34 57 52 -35 46 43 -34 57 14 1.13 -142 0 0 -35 47 42 19 27 21.2 9 308 48 -36 12 0 -35 23 36 -36 12 38 -35 22 59 1.13 -141 0 0 -36 13 52 19 27 22.6 8 307 48 -36 38 16 -35 49 41 -36 38 54 -35 49 3 1.14 -140 0 0 -36 40 21 19 27 23.8 7 306 48 -37 4 51 -36 16 4 -37 5 30 -36 15 27 1.14 -139 0 0 -37 7 9 19 27 24.9 6 306 48 -37 31 44 -36 42 46 -37 32 23 -36 42 8 1.15 -138 0 0 -37 34 13 19 27 25.8 5 305 48 -37 58 55 -37 9 45 -37 59 34 -37 9 7 1.15 -137 0 0 -38 1 35 19 27 26.6 4 304 49 -38 26 22 -37 37 1 -38 27 1 -37 36 23 1.16 -136 0 0 -38 29 12 19 27 27.2 3 304 49 -38 54 5 -38 4 33 -38 54 44 -38 3 54 1.18 -135 0 0 -38 57 3 19 27 27.6 2 303 49 -39 22 2 -38 32 19 -39 22 41 -38 31 40 1.21 -134 0 0 -39 25 9 19 27 27.9 1 303 49 -39 50 13 -39 0 18 -39 50 53 -38 59 40 1.28 -133 0 0 -39 53 27 19 27 28.0 0 302 49 -40 18 37 -39 28 31 -40 19 17 -39 27 52 1.62 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4-569-029510 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 31 51.9387 DE: +23 44 08.305 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 31 51.9388 DE: +23 44 08.305 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (267) Tirza asteroid class: approx. diameter [km]: 53 approx. diameter ["]: 0.025 distance from Earth [AU]: 2.91700 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#128 date of fit: 2023 Aug 23 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): 0.008", 0.000", 87.091° remarks: * orbital elements for (267)Tirza : Mean anomaly = 164.9780520587 deg Arg. of pericenter = 196.8808798894 deg Long. of node = 73.5858176162 deg Inclination = 6.0094155345 deg Eccentricity = 0.1018299159 Semimajor axis = 2.7732354341 AU Perihelion dist = 2.4908371029 AU Mag: H = 10.29, G = 0.15 Epoch of elements : MJD 60215.80763889 TDT (2023 Sep 28.8076) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1282023Aug23,3.34,2023,9,28,19.383305,0.046780,-0.742368,8.926633,0.561677,-0.005736,0.000334,0.000000,0.000000 160.2660,23.7194,-113.09,-2.15,False UCAC4-569-029510,6.53109405,23.7356403,0.00,12.15,0.00,0.0,0,,6.55505235,23.7194366,3.89,0.00,0,0,0 267,Tirza,16.01,53.000,2.9170,0,0,1.960,1.69,,2.4,0 0,164.8057,2023,9,28,196.8809,73.5858,6.0094,0.10183,2.77324,2.49084,10.29,5.0,0.15 1.013,0.0077,0.0003,87,0.0077,Known errors,-1.00,0,-1,-1 20230928_029510,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org