IOTA/IOTA-ES occultation update for (258) Tyche / UCAC4 501-029198 event on 2023 Oct 16, 23:40 UT Visible from Europe, SW Asia, India Summary ------- On 2023 Oct 16 UT, the 65.5 km diameter asteroid (258) Tyche will occult a 11.4 mag star in the constellation Monoceros for observers along a path across Europe, SW Asia, India. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.66 mag to 12.76 mag (the magnitude of the asteroid) for at most 5.450 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 Oct 16, 23:31 - 2023 Oct 16, 23:49 * geocentric midpoint of event [JD]: 2460234.48633200 * magnitude of target star: 11.37 * magnitude drop [mag]: 1.66 * estimated maximum duration [s]: 5.450 * Moon: 5 % sunlit, 128° distance * Sun: 103° distance * rough path description: Europe, SW Asia, India The occultation path -------------------- * approximate projected width [km]: 66 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.001", 98°) * approx speed of asteroid's shadow [km/s]: 12.0128 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 501-029198 by 258 Tyche on 2023 Oct 16 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 50 24 17 23 31 32.2 0 74 -44 .. .. .. 50 42 46 .. .. .. 50 47 13 .... - 20 0 0 50 34 54 23 31 32.2 1 75 -44 50 16 29 50 53 20 50 12 4 50 57 46 -0.17 - 19 0 0 50 44 59 23 31 32.3 1 76 -44 50 26 38 51 3 22 50 22 14 51 7 46 -0.14 - 18 0 0 50 54 33 23 31 32.5 2 76 -45 50 36 15 51 12 52 50 31 51 51 17 15 -0.13 - 17 0 0 51 3 35 23 31 32.8 3 77 -45 50 45 20 51 21 50 50 40 57 51 26 13 -0.12 - 16 0 0 51 12 6 23 31 33.1 3 78 -45 50 53 54 51 30 18 50 49 32 51 34 41 -0.12 - 15 0 0 51 20 6 23 31 33.5 4 79 -45 51 1 57 51 38 16 50 57 36 51 42 37 -0.12 - 14 0 0 51 27 36 23 31 33.9 5 80 -45 51 9 30 51 45 43 51 5 9 51 50 3 -0.12 - 13 0 0 51 34 35 23 31 34.4 5 80 -45 51 16 32 51 52 40 51 12 12 51 57 0 -0.11 - 12 0 0 51 41 5 23 31 35.0 6 81 -46 51 23 4 51 59 7 51 18 45 52 3 26 -0.11 - 11 0 0 51 47 5 23 31 35.6 6 82 -46 51 29 6 52 5 5 51 24 47 52 9 24 -0.11 - 10 0 0 51 52 36 23 31 36.3 7 83 -46 51 34 39 52 10 33 51 30 21 52 14 52 -0.11 - 9 0 0 51 57 37 23 31 37.1 8 84 -46 51 39 42 52 15 33 51 35 24 52 19 51 -0.11 - 8 0 0 52 2 10 23 31 37.9 8 84 -46 51 44 17 52 20 4 51 39 59 52 24 21 -0.11 - 7 0 0 52 6 13 23 31 38.8 9 85 -46 51 48 22 52 24 6 51 44 5 52 28 23 -0.11 - 6 0 0 52 9 48 23 31 39.7 10 86 -46 51 51 58 52 27 39 51 47 41 52 31 56 -0.11 - 5 0 0 52 12 55 23 31 40.7 10 87 -46 51 55 5 52 30 44 51 50 49 52 35 1 -0.11 - 4 0 0 52 15 33 23 31 41.8 11 87 -46 51 57 44 52 33 21 51 53 28 52 37 38 -0.11 - 3 0 0 52 17 42 23 31 42.9 11 88 -47 51 59 55 52 35 30 51 55 39 52 39 46 -0.11 - 2 0 0 52 19 23 23 31 44.0 12 89 -47 52 1 37 52 37 11 51 57 21 52 41 27 -0.11 - 1 0 0 52 20 36 23 31 45.3 13 90 -47 52 2 50 52 38 23 51 58 35 52 42 39 -0.11 0 0 0 52 21 21 23 31 46.6 13 91 -47 52 3 36 52 39 8 51 59 20 52 43 24 -0.11 1 0 0 52 21 38 23 31 47.9 14 91 -47 52 3 52 52 39 24 51 59 37 52 43 40 -0.10 2 0 0 52 21 26 23 31 49.3 15 92 -47 52 3 41 52 39 13 51 59 25 52 43 29 -0.10 3 0 0 52 20 47 23 31 50.8 15 93 -47 52 3 1 52 38 33 51 58 45 52 42 49 -0.10 4 0 0 52 19 39 23 31 52.3 16 94 -47 52 1 52 52 37 26 51 57 37 52 41 42 -0.10 5 0 0 52 18 2 23 31 53.9 16 95 -47 52 0 15 52 35 50 51 55 59 52 40 6 -0.10 6 0 0 52 15 57 23 31 55.6 17 95 -47 51 58 10 52 33 46 51 53 54 52 38 2 -0.10 7 0 0 52 13 24 23 31 57.3 18 96 -47 51 55 36 52 31 13 51 51 19 52 35 30 -0.10 8 0 0 52 10 22 23 31 59.1 18 97 -47 51 52 32 52 28 12 51 48 16 52 32 29 -0.10 9 0 0 52 6 51 23 32 0.9 19 98 -47 51 49 0 52 24 43 51 44 43 52 29 0 -0.10 10 0 0 52 2 51 23 32 2.9 19 99 -47 51 44 59 52 20 44 51 40 42 52 25 2 -0.10 11 0 0 51 58 22 23 32 4.8 20 99 -47 51 40 28 52 16 17 51 36 10 52 20 35 -0.10 12 0 0 51 53 24 23 32 6.9 21 100 -47 51 35 28 52 11 20 51 31 10 52 15 38 -0.10 13 0 0 51 47 55 23 32 9.0 21 101 -47 51 29 58 52 5 54 51 25 39 52 10 13 -0.10 14 0 0 51 41 57 23 32 11.2 22 102 -47 51 23 57 51 59 58 51 19 38 52 4 17 -0.10 15 0 0 51 35 29 23 32 13.4 23 103 -46 51 17 26 51 53 32 51 13 7 51 57 52 -0.10 16 0 0 51 28 30 23 32 15.8 23 103 -46 51 10 25 51 46 36 51 6 5 51 50 56 -0.10 17 0 0 51 21 0 23 32 18.2 24 104 -46 51 2 53 51 39 9 50 58 32 51 43 30 -0.10 18 0 0 51 13 0 23 32 20.6 25 105 -46 50 54 49 51 31 11 50 50 27 51 35 33 -0.10 19 0 0 51 4 27 23 32 23.2 25 106 -46 50 46 13 51 22 42 50 41 51 51 27 4 -0.10 20 0 0 50 55 23 23 32 25.8 26 107 -46 50 37 5 51 13 40 50 32 42 51 18 4 -0.10 21 0 0 50 45 46 23 32 28.5 27 107 -46 50 27 25 51 4 7 50 23 1 51 8 31 -0.10 22 0 0 50 35 36 23 32 31.3 27 108 -46 50 17 12 50 54 1 50 12 47 50 58 26 -0.10 23 0 0 50 24 53 23 32 34.2 28 109 -46 50 6 25 50 43 22 50 1 59 50 47 48 -0.10 24 0 0 50 13 36 23 32 37.2 29 110 -45 49 55 4 50 32 9 49 50 37 50 36 36 -0.10 25 0 0 50 1 45 23 32 40.2 29 111 -45 49 43 9 50 20 22 49 38 41 50 24 51 -0.10 26 0 0 49 49 19 23 32 43.4 30 111 -45 49 30 38 50 8 1 49 26 9 50 12 30 -0.10 27 0 0 49 36 18 23 32 46.6 31 112 -45 49 17 32 49 55 4 49 13 2 49 59 34 -0.10 28 0 0 49 22 40 23 32 50.0 31 113 -45 49 3 49 49 41 31 48 59 18 49 46 3 -0.10 29 0 0 49 8 26 23 32 53.4 32 114 -45 48 49 30 49 27 22 48 44 58 49 31 55 -0.10 30 0 0 48 53 34 23 32 57.0 33 115 -44 48 34 33 49 12 36 48 29 59 49 17 10 -0.10 31 0 0 48 38 5 23 33 0.6 33 115 -44 48 18 58 48 57 12 48 14 23 49 1 47 -0.10 32 0 0 48 21 56 23 33 4.4 34 116 -44 48 2 44 48 41 9 47 58 8 48 45 46 -0.10 33 0 0 48 5 9 23 33 8.2 35 117 -44 47 45 50 48 24 27 47 41 13 48 29 6 -0.10 34 0 0 47 47 41 23 33 12.2 36 118 -43 47 28 16 48 7 6 47 23 37 48 11 45 -0.10 35 0 0 47 29 32 23 33 16.3 36 119 -43 47 10 1 47 49 3 47 5 20 47 53 44 -0.09 36 0 0 47 10 41 23 33 20.6 37 119 -43 46 51 4 47 30 19 46 46 21 47 35 1 -0.09 37 0 0 46 51 7 23 33 24.9 38 120 -42 46 31 24 47 10 52 46 26 40 47 15 36 -0.09 38 0 0 46 30 51 23 33 29.4 39 121 -42 46 11 0 46 50 42 46 6 14 46 55 28 -0.09 39 0 0 46 9 49 23 33 34.0 39 122 -42 45 49 51 46 29 48 45 45 4 46 34 35 -0.09 40 0 0 45 48 3 23 33 38.8 40 123 -42 45 27 57 46 8 9 45 23 8 46 12 58 -0.09 41 0 0 45 25 30 23 33 43.7 41 123 -41 45 5 17 45 45 43 45 0 26 45 50 35 -0.09 42 0 0 45 2 10 23 33 48.7 42 124 -41 44 41 49 45 22 31 44 36 57 45 27 24 -0.09 43 0 0 44 38 2 23 33 53.9 43 125 -40 44 17 33 44 58 31 44 12 39 45 3 26 -0.09 44 0 0 44 13 4 23 33 59.3 44 126 -40 43 52 28 44 33 42 43 47 31 44 38 39 -0.09 45 0 0 43 47 17 23 34 4.8 44 126 -40 43 26 32 44 8 3 43 21 33 44 13 2 -0.09 46 0 0 43 20 38 23 34 10.5 45 127 -39 42 59 45 43 41 33 42 54 44 43 46 34 -0.09 47 0 0 42 53 8 23 34 16.3 46 128 -39 42 32 5 43 14 10 42 27 3 43 19 14 -0.09 48 0 0 42 24 43 23 34 22.3 47 129 -38 42 3 32 42 45 55 41 58 28 42 51 1 -0.09 49 0 0 41 55 25 23 34 28.5 48 130 -38 41 34 5 42 16 46 41 28 58 42 21 54 -0.09 50 0 0 41 25 11 23 34 34.9 49 130 -37 41 3 42 41 46 42 40 58 33 41 51 51 -0.09 51 0 0 40 54 1 23 34 41.5 50 131 -37 40 32 22 41 15 41 40 27 11 41 20 53 -0.09 52 0 0 40 21 53 23 34 48.3 51 132 -36 40 0 5 40 43 43 39 54 51 40 48 57 -0.09 53 0 0 39 48 47 23 34 55.3 52 133 -36 39 26 49 40 10 46 39 21 33 40 16 3 -0.09 54 0 0 39 14 41 23 35 2.4 53 134 -35 38 52 33 39 36 50 38 47 15 39 42 9 -0.09 55 0 0 38 39 35 23 35 9.8 54 135 -35 38 17 17 39 1 54 38 11 56 39 7 15 -0.09 56 0 0 38 3 27 23 35 17.4 55 135 -34 37 40 59 38 25 56 37 35 35 38 31 20 -0.09 57 0 0 37 26 17 23 35 25.3 56 136 -33 37 3 38 37 48 56 36 58 12 37 54 22 -0.09 58 0 0 36 48 3 23 35 33.3 57 137 -33 36 25 14 37 10 53 36 19 45 37 16 21 -0.09 59 0 0 36 8 45 23 35 41.6 58 138 -32 35 45 45 36 31 45 35 40 14 36 37 16 -0.09 60 0 0 35 28 22 23 35 50.1 59 139 -32 35 5 12 35 51 32 34 59 38 35 57 6 -0.09 61 0 0 34 46 53 23 35 58.9 60 140 -31 34 23 32 35 10 14 34 17 56 35 15 51 -0.09 62 0 0 34 4 18 23 36 7.8 61 141 -30 33 40 46 34 27 50 33 35 8 34 33 29 -0.10 63 0 0 33 20 35 23 36 17.1 62 142 -29 32 56 54 33 44 18 32 51 13 33 50 0 -0.10 64 0 0 32 35 46 23 36 26.6 63 143 -29 32 11 54 32 59 39 32 6 10 33 5 23 -0.10 65 0 0 31 49 49 23 36 36.3 64 144 -28 31 25 46 32 13 53 31 20 0 32 19 39 -0.10 66 0 0 31 2 44 23 36 46.3 65 145 -27 30 38 30 31 26 58 30 32 42 31 32 47 -0.10 67 0 0 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35 23 42 30.1 74 294 2 3 34 58 4 28 15 3 28 35 4 34 39 -0.11 94 0 0 2 55 10 23 42 43.7 73 296 3 2 28 36 3 21 46 2 22 14 3 28 10 -0.12 95 0 0 1 48 58 23 42 57.2 72 297 4 1 22 28 2 15 30 1 16 7 2 21 53 -0.12 96 0 0 0 43 4 23 43 10.6 70 299 5 0 16 39 1 9 32 0 10 19 1 15 53 -0.12 97 0 0 - 0 22 28 23 43 23.8 69 300 6 - 0 48 48 0 3 54 - 0 55 7 0 10 14 -0.12 98 0 0 - 1 27 34 23 43 36.8 67 301 8 - 1 53 48 - 1 1 18 - 2 0 6 - 0 54 59 -0.12 99 0 0 - 2 32 10 23 43 49.6 66 302 9 - 2 58 18 - 2 5 59 - 3 4 34 - 1 59 42 -0.12 100 0 0 - 3 36 11 23 44 2.3 64 302 10 - 4 2 12 - 3 10 8 - 4 8 26 - 3 3 52 -0.12 101 0 0 - 4 39 34 23 44 14.6 63 303 11 - 5 5 28 - 4 13 38 - 5 11 40 - 4 7 25 -0.12 102 0 0 - 5 42 16 23 44 26.8 61 303 12 - 6 8 2 - 5 16 28 - 6 14 13 - 5 10 16 -0.12 103 0 0 - 6 44 13 23 44 38.7 60 304 14 - 7 9 51 - 6 18 34 - 7 16 0 - 6 12 24 -0.12 104 0 0 - 7 45 23 23 44 50.3 59 304 15 - 8 10 52 - 7 19 52 - 8 16 59 - 7 13 44 -0.12 105 0 0 - 8 45 42 23 45 1.7 57 304 16 - 9 11 2 - 8 20 20 - 9 17 7 - 8 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130 0 0 -28 19 19 23 48 11.9 26 299 40 -28 40 28 -27 58 8 -28 45 32 -27 53 3 -0.13 131 0 0 -28 52 34 23 48 16.1 25 299 41 -29 13 34 -28 31 32 -29 18 36 -28 26 29 -0.13 132 0 0 -29 24 50 23 48 20.1 24 298 41 -29 45 42 -29 3 58 -29 50 42 -28 58 57 -0.13 133 0 0 -29 56 10 23 48 23.9 23 298 42 -30 16 53 -29 35 25 -30 21 51 -29 30 26 -0.13 134 0 0 -30 26 32 23 48 27.6 22 297 43 -30 47 7 -30 5 56 -30 52 3 -30 0 59 -0.13 135 0 0 -30 55 58 23 48 31.0 21 297 43 -31 16 25 -30 35 30 -31 21 20 -30 30 35 -0.13 136 0 0 -31 24 30 23 48 34.2 20 296 44 -31 44 49 -31 4 9 -31 49 41 -30 59 16 -0.13 137 0 0 -31 52 7 23 48 37.2 19 296 45 -32 12 19 -31 31 54 -32 17 9 -31 27 3 -0.13 138 0 0 -32 18 51 23 48 40.1 18 295 45 -32 38 55 -31 58 46 -32 43 44 -31 53 56 -0.13 139 0 0 -32 44 43 23 48 42.8 17 294 46 -33 4 40 -32 24 45 -33 9 27 -32 19 57 -0.13 140 0 0 -33 9 43 23 48 45.3 16 294 47 -33 29 33 -32 49 52 -33 34 18 -32 45 6 -0.13 141 0 0 -33 33 52 23 48 47.6 15 293 47 -33 53 35 -33 14 8 -33 58 19 -33 9 24 -0.13 142 0 0 -33 57 12 23 48 49.8 14 293 48 -34 16 48 -33 37 34 -34 21 30 -33 32 51 -0.13 143 0 0 -34 19 42 23 48 51.9 13 292 48 -34 39 12 -34 0 11 -34 43 53 -33 55 29 -0.13 144 0 0 -34 41 24 23 48 53.8 13 292 49 -35 0 48 -34 21 59 -35 5 27 -34 17 19 -0.13 145 0 0 -35 2 18 23 48 55.5 12 291 49 -35 21 36 -34 42 59 -35 26 14 -34 38 21 -0.13 146 0 0 -35 22 26 23 48 57.1 11 291 50 -35 41 38 -35 3 13 -35 46 15 -34 58 36 -0.13 147 0 0 -35 41 48 23 48 58.6 10 290 50 -36 0 54 -35 22 40 -36 5 29 -35 18 4 -0.13 148 0 0 -36 0 24 23 48 59.9 9 289 51 -36 19 25 -35 41 22 -36 23 59 -35 36 47 -0.13 149 0 0 -36 18 16 23 49 1.1 8 289 51 -36 37 12 -35 59 18 -36 41 44 -35 54 45 -0.14 150 0 0 -36 35 23 23 49 2.1 7 288 52 -36 54 14 -36 16 31 -36 58 46 -36 11 59 -0.14 151 0 0 -36 51 48 23 49 3.1 6 288 52 -37 10 34 -36 33 0 -37 15 4 -36 28 30 -0.14 152 0 0 -37 7 29 23 49 3.9 6 287 53 -37 26 11 -36 48 47 -37 30 40 -36 44 17 -0.14 153 0 0 -37 22 29 23 49 4.6 5 286 53 -37 41 6 -37 3 51 -37 45 34 -36 59 22 -0.14 154 0 0 -37 36 47 23 49 5.1 4 286 54 -37 55 20 -37 18 13 -37 59 47 -37 13 45 -0.15 155 0 0 -37 50 24 23 49 5.6 3 285 54 -38 8 53 -37 31 54 -38 13 19 -37 27 27 -0.16 156 0 0 -38 3 21 23 49 6.0 2 285 54 -38 21 46 -37 44 54 -38 26 11 -37 40 29 -0.17 157 0 0 -38 15 38 23 49 6.2 1 284 55 -38 33 59 -37 57 15 -38 38 24 -37 52 50 -0.20 158 0 0 -38 27 15 23 49 6.3 1 283 55 -38 45 33 -38 8 56 -38 49 57 -38 4 32 -0.29 Uncertainty in time = +/- 1 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: UCAC4 501-029198 * constellation : Monoceros * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 06 36 16.2814 DE: +10 06 27.519 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 06 36 16.2814 DE: +10 06 27.518 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (258) Tyche asteroid class: approx. diameter [km]: 66 approx. diameter ["]: 0.047 distance from Earth [AU]: 1.91660 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#95 date of fit: 2023 Oct 09 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", 0.001", 98.238° remarks: * orbital elements for (258)Tyche : Mean anomaly = 51.0713110949 deg Arg. of pericenter = 155.4903289551 deg Long. of node = 207.5375903138 deg Inclination = 14.3292501159 deg Eccentricity = 0.2053772255 Semimajor axis = 2.6147400128 AU Perihelion dist = 2.0777319635 AU Mag: H = 8.33, G = 0.23 Epoch of elements : MJD 60233.98638889 TDT (2023 Oct 16.9864) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#952023Oct09,5.45,2023,10,16,23.671968,0.075256,0.074560,4.776721,-4.812063,-0.005434,0.000672,0.000000,0.000000 79.0879,10.0901,-178.70,-9.07,False UCAC4 501-029198,6.60452258,10.1076441,0.00,11.37,0.00,0.0,0,,6.62634862,10.0900679,1.65,0.00,0,0,0 258,Tyche,12.76,65.500,1.9166,0,0,1.484,-22.08,,3.6,0 0,50.8414,2023,10,16,155.4903,207.5376,14.3293,0.20538,2.61474,2.07773,8.35,5.0,0.15 1.120,0.0093,0.0008,98,0.0094,Known errors,-1.00,0,-1,-1 20231016_029198,60232.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 20:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org