IOTA/IOTA-ES occultation update for (24) Themis / TYC 847-01351-1 event on 2024 Dec 18, 11:57 UT Visible from Summary ------- On 2024 Dec 18 UT, the 196.179 km diameter asteroid (24) Themis will occult a 10.8 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.82 mag to 12.35 mag (the magnitude of the asteroid) for at most 19.930 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: 2024 Dec 18, 11:46 - 2024 Dec 18, 12:08 * geocentric midpoint of event [JD]: 2460662.99829862 * magnitude of target star: 10.76 * magnitude drop [mag]: 1.82 * estimated maximum duration [s]: 19.930 * Moon: 89 % sunlit, 36° distance * Sun: 105° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 197 * 1 sigma uncertainty interval [path widths]: +/- 0.01 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.001", 113°) * approx speed of asteroid's shadow [km/s]: 9.8418 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 847-01351-1 by 24 Themis on 2024 Dec 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 166 0 0 24 54 52 11 46 47.0 0 81 -75 .. .. .. 25 48 48 .. .. .. 25 50 14 .... 167 0 0 25 2 56 11 46 47.1 1 82 -76 24 9 7 25 56 49 24 7 42 25 58 15 -0.09 168 0 0 25 10 39 11 46 47.4 2 82 -77 24 16 52 26 4 29 24 15 28 26 5 54 -0.08 169 0 0 25 18 1 11 46 47.8 3 83 -77 24 24 17 26 11 48 24 22 52 26 13 14 -0.08 170 0 0 25 25 2 11 46 48.4 4 83 -78 24 31 21 26 18 47 24 29 56 26 20 12 -0.08 171 0 0 25 31 41 11 46 49.2 5 84 -79 24 38 3 26 25 24 24 36 38 26 26 48 -0.08 172 0 0 25 38 0 11 46 50.1 6 84 -80 24 44 24 26 31 39 24 42 59 26 33 4 -0.08 173 0 0 25 43 57 11 46 51.2 6 84 -81 24 50 23 26 37 34 24 48 59 26 38 59 -0.08 174 0 0 25 49 33 11 46 52.4 7 85 -82 24 56 1 26 43 8 24 54 36 26 44 32 -0.08 175 0 0 25 54 47 11 46 53.8 8 85 -83 25 1 17 26 48 20 24 59 53 26 49 44 -0.08 176 0 0 25 59 40 11 46 55.4 9 86 -83 25 6 12 26 53 11 25 4 48 26 54 35 -0.08 177 0 0 26 4 11 11 46 57.1 10 86 -84 25 10 45 26 57 40 25 9 21 26 59 4 -0.07 178 0 0 26 8 21 11 46 59.0 11 87 -85 25 14 57 27 1 48 25 13 32 27 3 12 -0.07 179 0 0 26 12 9 11 47 1.1 12 87 -85 25 18 46 27 5 34 25 17 22 27 6 59 -0.07 -180 0 0 26 15 35 11 47 3.3 13 88 -86 25 22 14 27 8 59 25 20 50 27 10 24 -0.07 -179 0 0 26 18 40 11 47 5.6 14 88 -86 25 25 20 27 12 3 25 23 56 27 13 27 -0.07 -178 0 0 26 21 22 11 47 8.1 15 88 -86 25 28 4 27 14 44 25 26 40 27 16 9 -0.07 -177 0 0 26 23 43 11 47 10.8 16 89 -86 25 30 26 27 17 4 25 29 2 27 18 29 -0.07 -176 0 0 26 25 43 11 47 13.7 16 89 -86 25 32 26 27 19 2 25 31 2 27 20 27 -0.07 -175 0 0 26 27 20 11 47 16.6 17 90 -86 25 34 4 27 20 39 25 32 40 27 22 3 -0.07 -174 0 0 26 28 35 11 47 19.8 18 90 -85 25 35 20 27 21 54 25 33 56 27 23 18 -0.07 -173 0 0 26 29 28 11 47 23.1 19 91 -84 25 36 14 27 22 47 25 34 49 27 24 11 -0.07 -172 0 0 26 30 0 11 47 26.6 20 91 -84 25 36 45 27 23 18 25 35 21 27 24 42 -0.07 -171 0 0 26 30 9 11 47 30.2 21 92 -83 25 36 54 27 23 27 25 35 30 27 24 51 -0.07 -170 0 0 26 29 56 11 47 33.9 22 92 -82 25 36 41 27 23 14 25 35 17 27 24 38 -0.07 -169 0 0 26 29 21 11 47 37.9 23 93 -81 25 36 6 27 22 39 25 34 42 27 24 3 -0.07 -168 0 0 26 28 23 11 47 42.0 24 93 -80 25 35 8 27 21 42 25 33 44 27 23 6 -0.07 -167 0 0 26 27 4 11 47 46.2 25 93 -80 25 33 48 27 20 22 25 32 24 27 21 47 -0.07 -166 0 0 26 25 22 11 47 50.6 26 94 -79 25 32 6 27 18 41 25 30 41 27 20 5 -0.07 -165 0 0 26 23 17 11 47 55.1 26 94 -78 25 30 0 27 16 38 25 28 36 27 18 2 -0.07 -164 0 0 26 20 51 11 47 59.8 27 95 -77 25 27 33 27 14 12 25 26 9 27 15 36 -0.07 -163 0 0 26 18 2 11 48 4.7 28 95 -76 25 24 43 27 11 24 25 23 18 27 12 48 -0.07 -162 0 0 26 14 50 11 48 9.7 29 96 -75 25 21 30 27 8 14 25 20 6 27 9 38 -0.07 -161 0 0 26 11 16 11 48 14.8 30 96 -74 25 17 54 27 4 41 25 16 30 27 6 6 -0.07 -160 0 0 26 7 20 11 48 20.1 31 97 -73 25 13 56 27 0 46 25 12 32 27 2 11 -0.07 -159 0 0 26 3 1 11 48 25.6 32 97 -73 25 9 36 26 56 29 25 8 11 26 57 53 -0.07 -158 0 0 25 58 19 11 48 31.2 33 98 -72 25 4 52 26 51 49 25 3 27 26 53 14 -0.07 -157 0 0 25 53 14 11 48 37.0 34 98 -71 24 59 46 26 46 47 24 58 21 26 48 11 -0.07 -156 0 0 25 47 47 11 48 42.9 35 99 -70 24 54 16 26 41 22 24 52 52 26 42 47 -0.07 -155 0 0 25 41 58 11 48 49.0 36 99 -69 24 48 24 26 35 34 24 47 0 26 36 59 -0.07 -154 0 0 25 35 45 11 48 55.2 37 100 -68 24 42 9 26 29 25 24 40 45 26 30 49 -0.07 -153 0 0 25 29 10 11 49 1.6 38 100 -67 24 35 32 26 22 52 24 34 7 26 24 17 -0.07 -152 0 0 25 22 12 11 49 8.1 38 101 -66 24 28 31 26 15 57 24 27 6 26 17 22 -0.07 -151 0 0 25 14 52 11 49 14.8 39 101 -65 24 21 7 26 8 39 24 19 42 26 10 4 -0.07 -150 0 0 25 7 8 11 49 21.6 40 102 -64 24 13 21 26 0 59 24 11 56 26 2 24 -0.07 -149 0 0 24 59 2 11 49 28.6 41 102 -63 24 5 11 25 52 55 24 3 46 25 54 21 -0.07 -148 0 0 24 50 32 11 49 35.7 42 102 -62 23 56 38 25 44 29 23 55 13 25 45 55 -0.07 -147 0 0 24 41 40 11 49 43.0 43 103 -61 23 47 43 25 35 41 23 46 18 25 37 6 -0.07 -146 0 0 24 32 25 11 49 50.4 44 103 -61 23 38 24 25 26 30 23 36 59 25 27 55 -0.07 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140 -22 13 12 46 15 7 6 13 11 16 15 8 37 -0.07 -107 0 0 13 47 11 11 56 26.6 83 145 -21 12 49 58 14 44 27 12 48 28 14 45 58 -0.07 -106 0 0 13 24 12 11 56 38.9 84 151 -20 12 26 55 14 21 32 12 25 24 14 23 3 -0.07 -105 0 0 13 0 58 11 56 51.2 84 159 -19 12 3 37 13 58 23 12 2 6 13 59 54 -0.07 -104 0 0 12 37 30 11 57 3.6 85 168 -18 11 40 5 13 34 59 11 38 34 13 36 30 -0.07 -103 0 0 12 13 49 11 57 16.1 86 181 -16 11 16 20 13 11 22 11 14 49 13 12 53 -0.07 -102 0 0 11 49 54 11 57 28.5 86 196 -15 10 52 22 12 47 31 10 50 51 12 49 2 -0.07 -101 0 0 11 25 48 11 57 41.0 86 211 -14 10 28 11 12 23 28 10 26 40 12 24 59 -0.07 -100 0 0 11 1 29 11 57 53.6 85 225 -13 10 3 49 11 59 13 10 2 18 12 0 44 -0.07 - 99 0 0 10 36 59 11 58 6.1 85 237 -12 9 39 16 11 34 46 9 37 45 11 36 18 -0.07 - 98 0 0 10 12 19 11 58 18.7 84 246 -11 9 14 33 11 10 9 9 13 2 11 11 40 -0.07 - 97 0 0 9 47 28 11 58 31.3 83 253 -10 8 49 40 10 45 21 8 48 8 10 46 53 -0.07 - 96 0 0 9 22 28 11 58 43.8 82 259 -9 8 24 37 10 20 24 8 23 6 10 21 56 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35 4 20 50 2 23 3 4 22 22 -0.08 - 81 0 0 2 56 45 12 1 48.3 66 283 8 1 58 41 3 54 54 1 57 9 3 56 26 -0.08 - 80 0 0 2 30 52 12 2 0.0 65 283 9 1 32 49 3 29 0 1 31 17 3 30 32 -0.08 - 79 0 0 2 5 1 12 2 11.6 64 284 10 1 7 0 3 3 8 1 5 28 3 4 40 -0.08 - 78 0 0 1 39 15 12 2 23.1 63 284 12 0 41 14 2 37 20 0 39 43 2 38 52 -0.08 - 77 0 0 1 13 33 12 2 34.5 62 284 13 0 15 34 2 11 36 0 14 2 2 13 8 -0.08 - 76 0 0 0 47 55 12 2 45.7 61 285 14 - 0 10 1 1 45 57 - 0 11 33 1 47 29 -0.08 - 75 0 0 0 22 24 12 2 56.8 60 285 15 - 0 35 31 1 20 24 - 0 37 2 1 21 56 -0.08 - 74 0 0 - 0 3 1 12 3 7.8 59 285 16 - 1 0 53 0 54 57 - 1 2 25 0 56 28 -0.08 - 73 0 0 - 0 28 19 12 3 18.6 57 285 17 - 1 26 9 0 29 36 - 1 27 40 0 31 8 -0.08 - 72 0 0 - 0 53 29 12 3 29.3 56 286 18 - 1 51 16 0 4 24 - 1 52 47 0 5 55 -0.08 - 71 0 0 - 1 18 30 12 3 39.8 55 286 19 - 2 16 15 - 0 20 41 - 2 17 46 - 0 19 9 -0.08 - 70 0 0 - 1 43 23 12 3 50.2 54 286 21 - 2 41 4 - 0 45 36 - 2 42 35 - 0 44 5 -0.08 - 69 0 0 - 2 8 5 12 4 0.4 53 286 22 - 3 5 43 - 1 10 22 - 3 7 14 - 1 8 50 -0.08 - 68 0 0 - 2 32 37 12 4 10.5 52 286 23 - 3 30 12 - 1 34 57 - 3 31 43 - 1 33 26 -0.09 - 67 0 0 - 2 56 58 12 4 20.3 51 286 24 - 3 54 30 - 1 59 22 - 3 56 0 - 1 57 51 -0.09 - 66 0 0 - 3 21 8 12 4 30.0 50 286 25 - 4 18 35 - 2 23 35 - 4 20 6 - 2 22 4 -0.09 - 65 0 0 - 3 45 5 12 4 39.6 49 286 26 - 4 42 29 - 2 47 36 - 4 43 59 - 2 46 5 -0.09 - 64 0 0 - 4 8 50 12 4 48.9 47 286 27 - 5 6 9 - 3 11 25 - 5 7 40 - 3 9 54 -0.09 - 63 0 0 - 4 32 21 12 4 58.0 46 286 28 - 5 29 36 - 3 35 0 - 5 31 7 - 3 33 30 -0.09 - 62 0 0 - 4 55 38 12 5 7.0 45 286 29 - 5 52 50 - 3 58 22 - 5 54 20 - 3 56 51 -0.09 - 61 0 0 - 5 18 41 12 5 15.8 44 286 31 - 6 15 48 - 4 21 29 - 6 17 18 - 4 19 59 -0.09 - 60 0 0 - 5 41 30 12 5 24.4 43 286 32 - 6 38 32 - 4 44 22 - 6 40 2 - 4 42 52 -0.09 - 59 0 0 - 6 4 3 12 5 32.8 42 286 33 - 7 1 0 - 5 7 0 - 7 2 30 - 5 5 29 -0.09 - 58 0 0 - 6 26 20 12 5 41.0 41 286 34 - 7 23 13 - 5 29 22 - 7 24 43 - 5 27 51 -0.09 - 57 0 0 - 6 48 21 12 5 49.0 40 286 35 - 7 45 9 - 5 51 27 - 7 46 39 - 5 49 57 -0.09 - 56 0 0 - 7 10 5 12 5 56.7 39 286 36 - 8 6 48 - 6 13 16 - 8 8 18 - 6 11 47 -0.09 - 55 0 0 - 7 31 32 12 6 4.3 38 286 37 - 8 28 11 - 6 34 49 - 8 29 40 - 6 33 19 -0.09 - 54 0 0 - 7 52 42 12 6 11.7 37 286 38 - 8 49 16 - 6 56 3 - 8 50 45 - 6 54 34 -0.09 - 53 0 0 - 8 13 34 12 6 18.9 35 286 39 - 9 10 3 - 7 17 0 - 9 11 32 - 7 15 31 -0.09 - 52 0 0 - 8 34 8 12 6 25.8 34 286 40 - 9 30 31 - 7 37 39 - 9 32 0 - 7 36 10 -0.09 - 51 0 0 - 8 54 23 12 6 32.6 33 285 41 - 9 50 41 - 7 58 0 - 9 52 10 - 7 56 31 -0.09 - 50 0 0 - 9 14 20 12 6 39.2 32 285 42 -10 10 33 - 8 18 1 -10 12 2 - 8 16 32 -0.09 - 49 0 0 - 9 33 57 12 6 45.5 31 285 44 -10 30 5 - 8 37 44 -10 31 34 - 8 36 15 -0.09 - 48 0 0 - 9 53 15 12 6 51.6 30 285 45 -10 49 18 - 8 57 7 -10 50 46 - 8 55 38 -0.09 - 47 0 0 -10 12 13 12 6 57.5 29 285 46 -11 8 11 - 9 16 10 -11 9 39 - 9 14 42 -0.09 - 46 0 0 -10 30 51 12 7 3.2 28 285 47 -11 26 44 - 9 34 54 -11 28 12 - 9 33 25 -0.09 - 45 0 0 -10 49 9 12 7 8.7 27 285 48 -11 44 56 - 9 53 17 -11 46 25 - 9 51 49 -0.09 - 44 0 0 -11 7 7 12 7 14.0 26 284 49 -12 2 49 -10 11 20 -12 4 17 -10 9 52 -0.09 - 43 0 0 -11 24 44 12 7 19.1 25 284 50 -12 20 21 -10 29 2 -12 21 48 -10 27 34 -0.09 - 42 0 0 -11 42 0 12 7 24.0 24 284 51 -12 37 32 -10 46 23 -12 38 59 -10 44 55 -0.09 - 41 0 0 -11 58 55 12 7 28.6 23 284 52 -12 54 21 -11 3 23 -12 55 49 -11 1 55 -0.09 - 40 0 0 -12 15 28 12 7 33.0 22 284 53 -13 10 50 -11 20 2 -13 12 18 -11 18 34 -0.09 - 39 0 0 -12 31 41 12 7 37.3 21 283 54 -13 26 58 -11 36 19 -13 28 25 -11 34 52 -0.09 - 38 0 0 -12 47 32 12 7 41.3 20 283 55 -13 42 43 -11 52 15 -13 44 11 -11 50 48 -0.09 - 37 0 0 -13 3 1 12 7 45.1 19 283 56 -13 58 8 -12 7 49 -13 59 35 -12 6 22 -0.09 - 36 0 0 -13 18 8 12 7 48.7 18 283 57 -14 13 10 -12 23 1 -14 14 37 -12 21 34 -0.09 - 35 0 0 -13 32 54 12 7 52.1 17 283 58 -14 27 51 -12 37 52 -14 29 18 -12 36 25 -0.09 - 34 0 0 -13 47 17 12 7 55.3 16 282 59 -14 42 9 -12 52 20 -14 43 36 -12 50 53 -0.09 - 33 0 0 -14 1 18 12 7 58.3 15 282 60 -14 56 6 -13 6 26 -14 57 33 -13 4 59 -0.09 - 32 0 0 -14 14 57 12 8 1.1 14 282 61 -15 9 40 -13 20 9 -15 11 7 -13 18 43 -0.09 - 31 0 0 -14 28 14 12 8 3.6 13 282 62 -15 22 53 -13 33 30 -15 24 19 -13 32 4 -0.09 - 30 0 0 -14 41 8 12 8 6.0 12 281 63 -15 35 43 -13 46 29 -15 37 9 -13 45 3 -0.09 - 29 0 0 -14 53 40 12 8 8.2 11 281 64 -15 48 10 -13 59 5 -15 49 36 -13 57 39 -0.09 - 28 0 0 -15 5 49 12 8 10.2 10 281 65 -16 0 15 -14 11 19 -16 1 41 -14 9 53 -0.09 - 27 0 0 -15 17 36 12 8 12.0 9 281 66 -16 11 58 -14 23 10 -16 13 24 -14 21 44 -0.09 - 26 0 0 -15 29 1 12 8 13.5 8 280 67 -16 23 18 -14 34 38 -16 24 44 -14 33 12 -0.09 - 25 0 0 -15 40 2 12 8 14.9 7 280 68 -16 34 16 -14 45 44 -16 35 42 -14 44 18 -0.10 - 24 0 0 -15 50 41 12 8 16.1 6 280 69 -16 44 51 -14 56 26 -16 46 17 -14 55 1 -0.10 - 23 0 0 -16 0 57 12 8 17.1 5 279 70 -16 55 4 -15 6 46 -16 56 29 -15 5 21 -0.10 - 22 0 0 -16 10 51 12 8 17.9 4 279 71 -17 4 54 -15 16 44 -17 6 19 -15 15 18 -0.11 - 21 0 0 -16 20 22 12 8 18.6 3 279 71 -17 14 21 -15 26 18 -17 15 47 -15 24 52 -0.11 - 20 0 0 -16 29 30 12 8 19.0 2 279 72 -17 23 26 -15 35 29 -17 24 52 -15 34 4 -0.13 - 19 0 0 -16 38 15 12 8 19.2 1 278 73 -17 32 9 -15 44 18 -17 33 34 -15 42 53 -0.19 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 847-01351-1 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 10 54 02.9888 DE: +07 55 18.306 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 10 54 02.9889 DE: +07 55 18.306 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.8 * B mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (24) Themis asteroid class: approx. diameter [km]: 196 approx. diameter ["]: 0.115 distance from Earth [AU]: 2.35980 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#137 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): 0.026", 0.001", 112.932° remarks: * orbital elements for (24)Themis : Mean anomaly = 357.1732531880 deg Arg. of pericenter = 108.9821536461 deg Long. of node = 36.3898151994 deg Inclination = 0.7367615868 deg Eccentricity = 0.1152886844 Semimajor axis = 3.1427307849 AU Perihelion dist = 2.7804094874 AU Mag: H = 7.27, G = 0.19 Epoch of elements : MJD 60662.49829850 TDT (2024 Dec 18.4983) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1372023Apr24,19.93,2024,12,18,11.959167,0.025590,0.066728,5.189314,-1.982155,-0.005302,0.002166,0.000000,0.000000 -103.1398,7.7884,-0.18,-23.41,False TYC 847-01351-1,10.90083021,7.9217519,11.21,10.76,10.52,0.0,0,,10.92261708,7.7884380,1.82,1.65,0,0,0 24,Themis,12.35,196.179,2.3598,0,0,1.302,-7.39,,11.4,0 0,357.0851,2024,12,18,108.9822,36.3898,0.7368,0.11529,3.14273,2.78041,7.27,5.0,0.15 1.013,0.0257,0.0012,113,0.0015,Known errors,0.82,0,-1,-1 20241218_1351-1,60140.74 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org