IOTA/IOTA-ES occultation update for (18) Melpomene / TYC 0061-01117-1 event on 2023 Sep 05, 08:29 UT Visible from S USA, Mexico Summary ------- On 2023 Sep 05 UT, the 142.2 km diameter asteroid (18) Melpomene will occult a 8.5 mag star in the constellation Cetus for observers along a path across S USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.30 mag to 9.37 mag (the magnitude of the asteroid) for at most 14.660 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 05, 08:18 - 2023 Sep 05, 08:40 * geocentric midpoint of event [JD]: 2460192.85371016 * magnitude of target star: 8.46 * magnitude drop [mag]: 1.30 * estimated maximum duration [s]: 14.660 * Moon: 67 % sunlit, 16° distance * Sun: 116° distance * rough path description: S USA, Mexico The occultation path -------------------- * approximate projected width [km]: 145 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 0.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.006", 75°) * approx speed of asteroid's shadow [km/s]: 9.6974 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0061-01117-1 by 18 Melpomene on 2023 Sep 5 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 -155 0 0 32 58 23 8 18 37.6 0 84 -41 32 18 50 33 38 2 32 16 5 33 40 48 .... -154 0 0 33 3 48 8 18 37.7 1 84 -42 32 24 16 33 43 25 32 21 31 33 46 11 -0.17 -153 0 0 33 8 52 8 18 38.0 2 85 -42 32 29 22 33 48 27 32 26 37 33 51 13 -0.19 -152 0 0 33 13 37 8 18 38.4 3 85 -42 32 34 8 33 53 11 32 31 23 33 55 56 -0.19 -151 0 0 33 18 1 8 18 39.0 4 86 -43 32 38 35 33 57 34 32 35 50 34 0 19 -0.20 -150 0 0 33 22 6 8 18 39.7 5 87 -43 32 42 41 34 1 37 32 39 56 34 4 23 -0.20 -149 0 0 33 25 51 8 18 40.6 5 87 -44 32 46 27 34 5 21 32 43 43 34 8 6 -0.20 -148 0 1 33 29 17 8 18 41.6 6 88 -44 32 49 54 34 8 45 32 47 9 34 11 30 -0.20 -147 0 1 33 32 22 8 18 42.7 7 88 -45 32 53 0 34 11 49 32 50 16 34 14 34 -0.20 -146 0 1 33 35 7 8 18 44.0 8 89 -45 32 55 46 34 14 33 32 53 2 34 17 18 -0.20 -145 0 1 33 37 32 8 18 45.5 9 89 -45 32 58 12 34 16 58 32 55 28 34 19 43 -0.20 -144 0 1 33 39 37 8 18 47.1 10 90 -46 33 0 18 34 19 2 32 57 34 34 21 47 -0.20 -143 0 1 33 41 22 8 18 48.8 10 90 -46 33 2 4 34 20 46 32 59 20 34 23 31 -0.20 -142 0 1 33 42 47 8 18 50.6 11 91 -46 33 3 29 34 22 11 33 0 45 34 24 56 -0.20 -141 0 1 33 43 52 8 18 52.6 12 92 -47 33 4 35 34 23 15 33 1 51 34 26 0 -0.20 -140 0 1 33 44 37 8 18 54.8 13 92 -47 33 5 20 34 23 59 33 2 36 34 26 44 -0.20 -139 0 1 33 45 1 8 18 57.1 14 93 -47 33 5 44 34 24 23 33 3 0 34 27 8 -0.20 -138 0 1 33 45 5 8 18 59.5 15 93 -48 33 5 49 34 24 27 33 3 5 34 27 12 -0.20 -137 0 1 33 44 49 8 19 2.1 15 94 -48 33 5 32 34 24 11 33 2 48 34 26 56 -0.20 -136 0 1 33 44 13 8 19 4.8 16 94 -48 33 4 56 34 23 35 33 2 12 34 26 20 -0.20 -135 0 1 33 43 16 8 19 7.6 17 95 -48 33 3 59 34 22 38 33 1 15 34 25 23 -0.20 -134 0 0 33 41 59 8 19 10.6 18 96 -49 33 2 41 34 21 21 32 59 57 34 24 6 -0.20 -133 0 0 33 40 21 8 19 13.8 19 96 -49 33 1 3 34 19 44 32 58 19 34 22 29 -0.20 -132 0 0 33 38 23 8 19 17.0 20 97 -49 32 59 5 34 17 46 32 56 20 34 20 31 -0.20 -131 0 0 33 36 4 8 19 20.4 21 97 -49 32 56 45 34 15 28 32 54 1 34 18 13 -0.20 -130 0 0 33 33 25 8 19 24.0 21 98 -49 32 54 5 34 12 50 32 51 21 34 15 35 -0.20 -129 0 0 33 30 25 8 19 27.7 22 98 -50 32 51 5 34 9 51 32 48 20 34 12 36 -0.20 -128 0 0 33 27 4 8 19 31.5 23 99 -50 32 47 43 34 6 31 32 44 59 34 9 16 -0.20 -127 0 0 33 23 23 8 19 35.5 24 100 -50 32 44 1 34 2 51 32 41 17 34 5 36 -0.20 -126 0 0 33 19 22 8 19 39.7 25 100 -50 32 39 58 33 58 51 32 37 14 34 1 36 -0.20 -125 0 0 33 14 59 8 19 43.9 26 101 -50 32 35 34 33 54 29 32 32 50 33 57 15 -0.20 -124 0 0 33 10 16 8 19 48.3 26 101 -50 32 30 49 33 49 47 32 28 5 33 52 33 -0.20 -123 0 0 33 5 11 8 19 52.9 27 102 -50 32 25 44 33 44 45 32 22 59 33 47 30 -0.20 -122 0 0 32 59 46 8 19 57.6 28 103 -50 32 20 17 33 39 21 32 17 32 33 42 7 -0.20 -121 0 0 32 54 0 8 20 2.5 29 103 -50 32 14 29 33 33 37 32 11 44 33 36 23 -0.20 -120 0 0 32 47 54 8 20 7.4 30 104 -50 32 8 21 33 27 32 32 5 35 33 30 18 -0.20 -119 0 0 32 41 26 8 20 12.6 31 104 -50 32 1 51 33 21 6 31 59 5 33 23 52 -0.20 -118 0 0 32 34 37 8 20 17.9 32 105 -50 31 55 0 33 14 19 31 52 14 33 17 6 -0.20 -117 0 0 32 27 27 8 20 23.3 32 106 -50 31 47 48 33 7 12 31 45 2 33 9 58 -0.20 -116 0 0 32 19 56 8 20 28.9 33 106 -50 31 40 14 32 59 43 31 37 29 33 2 29 -0.20 -115 0 0 32 12 4 8 20 34.6 34 107 -50 31 32 20 32 51 53 31 29 34 32 54 40 -0.20 -114 0 0 32 3 51 8 20 40.4 35 108 -50 31 24 4 32 43 42 31 21 18 32 46 29 -0.20 -113 0 0 31 55 16 8 20 46.5 36 108 -50 31 15 27 32 35 11 31 12 41 32 37 58 -0.20 -112 0 0 31 46 21 8 20 52.6 37 109 -49 31 6 29 32 26 18 31 3 43 32 29 5 -0.20 -111 0 0 31 37 4 8 20 58.9 38 109 -49 30 57 10 32 17 4 30 54 23 32 19 51 -0.20 -110 0 0 31 27 26 8 21 5.4 39 110 -49 30 47 29 32 7 29 30 44 42 32 10 16 -0.20 -109 0 0 31 17 27 8 21 12.0 39 111 -49 30 37 27 31 57 32 30 34 40 32 0 20 -0.20 -108 0 0 31 7 6 8 21 18.7 40 111 -49 30 27 3 31 47 15 30 24 16 31 50 3 -0.20 -107 0 0 30 56 25 8 21 25.6 41 112 -48 30 16 19 31 36 36 30 13 31 31 39 25 -0.20 -106 0 0 30 45 22 8 21 32.7 42 113 -48 30 5 13 31 25 37 30 2 25 31 28 25 -0.20 -105 0 0 30 33 58 8 21 39.9 43 113 -48 29 53 45 31 14 16 29 50 57 31 17 4 -0.20 -104 0 0 30 22 12 8 21 47.2 44 114 -47 29 41 57 31 2 34 29 39 8 31 5 23 -0.20 -103 0 0 30 10 6 8 21 54.7 45 115 -47 29 29 47 30 50 31 29 26 58 30 53 20 -0.20 -102 0 0 29 57 38 8 22 2.3 46 116 -47 29 17 15 30 38 6 29 14 27 30 40 56 -0.20 -101 0 0 29 44 49 8 22 10.1 47 116 -46 29 4 23 30 25 21 29 1 34 30 28 10 -0.20 -100 0 0 29 31 39 8 22 18.1 48 117 -46 28 51 9 30 12 14 28 48 20 30 15 4 -0.20 - 99 0 0 29 18 8 8 22 26.2 48 118 -46 28 37 34 29 58 47 28 34 45 30 1 37 -0.20 - 98 0 0 29 4 16 8 22 34.4 49 119 -45 28 23 39 29 44 58 28 20 49 29 47 49 -0.20 - 97 0 0 28 50 2 8 22 42.8 50 119 -45 28 9 22 29 30 49 28 6 32 29 33 40 -0.20 - 96 0 0 28 35 28 8 22 51.3 51 120 -44 27 54 44 29 16 19 27 51 54 29 19 10 -0.20 - 95 0 0 28 20 33 8 23 0.0 52 121 -44 27 39 45 29 1 28 27 36 55 29 4 19 -0.20 - 94 0 0 28 5 18 8 23 8.8 53 122 -43 27 24 26 28 46 16 27 21 35 28 49 7 -0.20 - 93 0 0 27 49 41 8 23 17.8 54 123 -43 27 8 45 28 30 43 27 5 55 28 33 35 -0.20 - 92 0 0 27 33 45 8 23 26.9 55 123 -42 26 52 45 28 14 51 26 49 54 28 17 43 -0.20 - 91 0 0 27 17 27 8 23 36.2 56 124 -42 26 36 24 27 58 37 26 33 32 28 1 30 -0.20 - 90 0 0 27 0 50 8 23 45.6 57 125 -41 26 19 42 27 42 4 26 16 50 27 44 56 -0.20 - 89 0 0 26 43 52 8 23 55.2 58 126 -41 26 2 40 27 25 10 25 59 48 27 28 3 -0.20 - 88 0 0 26 26 35 8 24 4.8 58 127 -40 25 45 19 27 7 56 25 42 27 27 10 50 -0.20 - 87 0 0 26 8 57 8 24 14.7 59 128 -40 25 27 37 26 50 23 25 24 45 26 53 16 -0.20 - 86 0 0 25 51 0 8 24 24.6 60 129 -39 25 9 36 26 32 30 25 6 44 26 35 23 -0.20 - 85 0 0 25 32 43 8 24 34.7 61 130 -38 24 51 16 26 14 17 24 48 23 26 17 11 -0.20 - 84 0 0 25 14 8 8 24 45.0 62 132 -38 24 32 36 25 55 45 24 29 43 25 58 40 -0.20 - 83 0 0 24 55 13 8 24 55.4 63 133 -37 24 13 38 25 36 55 24 10 44 25 39 49 -0.20 - 82 0 0 24 36 0 8 25 5.9 64 134 -36 23 54 20 25 17 45 23 51 26 25 20 40 -0.20 - 81 0 0 24 16 28 8 25 16.5 65 135 -36 23 34 45 24 58 17 23 31 50 25 1 12 -0.20 - 80 0 0 23 56 37 8 25 27.2 66 137 -35 23 14 51 24 38 31 23 11 56 24 41 26 -0.20 - 79 0 0 23 36 29 8 25 38.1 67 138 -34 22 54 39 24 18 26 22 51 44 24 21 22 -0.20 - 78 0 0 23 16 4 8 25 49.1 68 140 -34 22 34 10 23 58 4 22 31 15 24 1 0 -0.20 - 77 0 0 22 55 21 8 26 0.2 68 142 -33 22 13 23 23 37 25 22 10 28 23 40 21 -0.20 - 76 0 0 22 34 21 8 26 11.5 69 144 -32 21 52 20 23 16 29 21 49 24 23 19 25 -0.20 - 75 0 0 22 13 5 8 26 22.8 70 146 -32 21 31 0 22 55 16 21 28 4 22 58 13 -0.20 - 74 0 0 21 51 32 8 26 34.3 71 148 -31 21 9 24 22 33 47 21 6 28 22 36 44 -0.21 - 73 0 0 21 29 44 8 26 45.8 72 150 -30 20 47 32 22 12 2 20 44 36 22 14 59 -0.21 - 72 0 0 21 7 40 8 26 57.5 73 153 -29 20 25 25 21 50 1 20 22 29 21 52 59 -0.21 - 71 0 0 20 45 21 8 27 9.2 73 155 -28 20 3 3 21 27 46 20 0 7 21 30 43 -0.21 - 70 0 0 20 22 48 8 27 21.0 74 158 -28 19 40 27 21 5 16 19 37 30 21 8 13 -0.21 - 69 0 0 20 0 1 8 27 33.0 75 161 -27 19 17 37 20 42 32 19 14 40 20 45 29 -0.21 - 68 0 0 19 37 0 8 27 45.0 75 165 -26 18 54 34 20 19 34 18 51 36 20 22 32 -0.21 - 67 0 0 19 13 47 8 27 57.1 76 169 -25 18 31 17 19 56 23 18 28 20 19 59 21 -0.21 - 66 0 0 18 50 20 8 28 9.2 77 173 -24 18 7 48 19 32 59 18 4 51 19 35 58 -0.21 - 65 0 0 18 26 42 8 28 21.4 77 177 -24 17 44 8 19 9 23 17 41 10 19 12 22 -0.21 - 64 0 0 18 2 53 8 28 33.7 77 182 -23 17 20 16 18 45 36 17 17 18 18 48 35 -0.21 - 63 0 0 17 38 52 8 28 46.1 78 187 -22 16 56 13 18 21 38 16 53 15 18 24 37 -0.21 - 62 0 0 17 14 42 8 28 58.5 78 192 -21 16 32 1 17 57 30 16 29 3 18 0 29 -0.21 - 61 0 0 16 50 22 8 29 10.9 78 198 -20 16 7 39 17 33 11 16 4 41 17 36 11 -0.21 - 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33 0 0 5 9 58 8 34 51.2 57 272 7 4 27 29 5 52 34 4 24 32 5 55 32 -0.22 - 32 0 0 4 45 59 8 35 2.1 56 273 8 4 3 33 5 28 32 4 0 36 5 31 31 -0.22 - 31 0 0 4 22 11 8 35 12.9 55 273 9 3 39 48 5 4 42 3 36 51 5 7 40 -0.22 - 30 0 0 3 58 35 8 35 23.5 54 274 10 3 16 15 4 41 3 3 13 18 4 44 0 -0.22 - 29 0 0 3 35 11 8 35 33.9 53 274 11 2 52 54 4 17 36 2 49 57 4 20 33 -0.22 - 28 0 0 3 12 0 8 35 44.2 52 275 12 2 29 46 3 54 22 2 26 50 3 57 19 -0.22 - 27 0 0 2 49 3 8 35 54.4 51 275 13 2 6 52 3 31 21 2 3 56 3 34 18 -0.22 - 26 0 0 2 26 19 8 36 4.4 50 276 13 1 44 11 3 8 34 1 41 16 3 11 31 -0.22 - 25 0 0 2 3 50 8 36 14.2 49 276 14 1 21 46 2 46 1 1 18 50 2 48 58 -0.22 - 24 0 0 1 41 36 8 36 23.8 48 276 15 0 59 35 2 23 44 0 56 40 2 26 40 -0.22 - 23 0 0 1 19 37 8 36 33.2 46 276 16 0 37 40 2 1 42 0 34 45 2 4 38 -0.22 - 22 0 0 0 57 55 8 36 42.5 45 277 17 0 16 1 1 39 56 0 13 6 1 42 51 -0.22 - 21 0 0 0 36 28 8 36 51.6 44 277 18 - 0 5 22 1 18 26 - 0 8 16 1 21 21 -0.23 - 20 0 0 0 15 19 8 37 0.4 43 277 19 - 0 26 27 0 57 13 - 0 29 22 1 0 8 -0.23 - 19 0 0 - 0 5 33 8 37 9.1 42 277 20 - 0 47 16 0 36 17 - 0 50 10 0 39 12 -0.23 - 18 0 0 - 0 26 7 8 37 17.6 41 278 21 - 1 7 46 0 15 39 - 1 10 40 0 18 34 -0.23 - 17 0 0 - 0 46 23 8 37 25.9 40 278 22 - 1 27 58 - 0 4 41 - 1 30 52 - 0 1 46 -0.23 - 16 0 0 - 1 6 21 8 37 34.0 39 278 23 - 1 47 52 - 0 24 42 - 1 50 45 - 0 21 48 -0.23 - 15 0 0 - 1 25 59 8 37 41.9 38 278 24 - 2 7 27 - 0 44 25 - 2 10 20 - 0 41 31 -0.23 - 14 0 0 - 1 45 19 8 37 49.6 37 278 25 - 2 26 43 - 1 3 48 - 2 29 35 - 1 0 54 -0.23 - 13 0 0 - 2 4 19 8 37 57.1 36 278 26 - 2 45 39 - 1 22 52 - 2 48 31 - 1 19 59 -0.23 - 12 0 0 - 2 22 59 8 38 4.4 35 278 27 - 3 4 15 - 1 41 36 - 3 7 7 - 1 38 43 -0.23 - 11 0 0 - 2 41 19 8 38 11.4 34 278 28 - 3 22 31 - 2 0 0 - 3 25 23 - 1 57 7 -0.23 - 10 0 0 - 2 59 19 8 38 18.3 33 278 29 - 3 40 27 - 2 18 3 - 3 43 19 - 2 15 11 -0.23 - 9 0 0 - 3 16 57 8 38 24.9 32 278 30 - 3 58 2 - 2 35 46 - 4 0 53 - 2 32 54 -0.23 - 8 0 0 - 3 34 15 8 38 31.3 30 278 31 - 4 15 16 - 2 53 8 - 4 18 7 - 2 50 16 -0.23 - 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7 26 8 - 6 5 31 - 7 28 56 - 6 2 42 -0.23 6 0 0 - 6 57 58 8 39 38.6 16 278 44 - 7 38 10 - 6 17 40 - 7 40 58 - 6 14 52 -0.23 7 0 0 - 7 9 41 8 39 41.8 15 278 45 - 7 49 50 - 6 29 26 - 7 52 37 - 6 26 37 -0.23 8 0 0 - 7 21 0 8 39 44.8 14 277 46 - 8 1 6 - 6 40 48 - 8 3 53 - 6 38 0 -0.23 9 0 0 - 7 31 56 8 39 47.6 13 277 47 - 8 11 59 - 6 51 47 - 8 14 46 - 6 48 59 -0.23 10 0 0 - 7 42 29 8 39 50.1 12 277 48 - 8 22 29 - 7 2 22 - 8 25 16 - 6 59 34 -0.23 11 0 0 - 7 52 38 8 39 52.4 11 277 49 - 8 32 35 - 7 12 34 - 8 35 22 - 7 9 46 -0.23 12 0 0 - 8 2 23 8 39 54.6 10 277 50 - 8 42 18 - 7 22 22 - 8 45 5 - 7 19 35 -0.23 13 0 0 - 8 11 45 8 39 56.5 9 277 50 - 8 51 38 - 7 31 47 - 8 54 24 - 7 29 0 -0.24 14 0 0 - 8 20 44 8 39 58.2 8 277 51 - 9 0 34 - 7 40 48 - 9 3 20 - 7 38 1 -0.24 15 0 0 - 8 29 19 8 39 59.7 7 277 52 - 9 9 7 - 7 49 25 - 9 11 53 - 7 46 38 -0.24 16 0 0 - 8 37 30 8 40 1.0 6 276 53 - 9 17 16 - 7 57 39 - 9 20 2 - 7 54 52 -0.24 17 0 0 - 8 45 18 8 40 2.0 5 276 54 - 9 25 1 - 8 5 29 - 9 27 47 - 8 2 42 -0.25 18 0 0 - 8 52 43 8 40 2.9 4 276 55 - 9 32 24 - 8 12 56 - 9 35 9 - 8 10 9 -0.26 19 0 0 - 8 59 43 8 40 3.6 3 276 56 - 9 39 22 - 8 19 58 - 9 42 8 - 8 17 12 -0.27 20 0 0 - 9 6 20 8 40 4.0 2 276 56 - 9 45 57 - 8 26 37 - 9 48 43 - 8 23 51 -0.30 21 0 0 - 9 12 34 8 40 4.3 1 276 57 - 9 52 9 - 8 32 52 - 9 54 54 - 8 30 6 -0.40 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: TYC 0061-01117-1 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 03 06 19.8831 DE: +05 18 53.260 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 03 06 19.8832 DE: +05 18 53.261 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 8.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (18) Melpomene asteroid class: ShapeModel approx. diameter [km]: 142 approx. diameter ["]: 0.177 distance from Earth [AU]: 1.10770 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#127 date of fit: 2023 Aug 22 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): 0.007", 0.006", 74.906° remarks: * orbital elements for (18)Melpomene : Mean anomaly = 358.2321622272 deg Arg. of pericenter = 228.1509316334 deg Long. of node = 150.3560870504 deg Inclination = 10.1316202490 deg Eccentricity = 0.2183827789 Semimajor axis = 2.2958313956 AU Perihelion dist = 1.7944613555 AU Mag: H = 6.34, G = 0.25 Epoch of elements : MJD 60192.35354167 TDT (2023 Sep 05.3535) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1272023Aug22,14.66,2023,9,5,8.489044,0.073703,0.191205,5.106900,-1.969491,-0.004314,-0.000796,0.000000,0.000000 -64.6333,5.4080,52.38,6.85,False TYC 0061-01117-1,3.10552307,5.3147945,0.00,8.46,0.00,0.0,0,,3.12635820,5.4080121,1.30,0.00,0,0,0 18,Melpomene,9.37,142.200,1.1077,0,0,2.715,-15.64,,8.0,0 0,358.1320,2023,9,5,228.1509,150.3561,10.1316,0.21838,2.29583,1.79446,6.57,5.0,0.15 1.035,0.0070,0.0057,75,0.0090,Known errors,-1.00,0,-1,-1 20230905_1117-1,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org