IOTA/IOTA-ES occultation update for (137) Meliboea / UCAC4-378-069458 event on 2023 Jan 02, 16:08 UT Visible from Australia Summary ------- On 2023 Jan 02 UT, the 140.4 km diameter asteroid (137) Meliboea will occult a 12.5 mag star in the constellation Libra 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 2.04 mag to 14.34 mag (the magnitude of the asteroid) for at most 4.530 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 Jan 02, 16:06 - 2023 Jan 02, 16:11 * geocentric midpoint of event [JD]: 2459947.17279050 * magnitude of target star: 12.48 * magnitude drop [mag]: 2.04 * estimated maximum duration [s]: 4.530 * Moon: 84 % sunlit, 165° distance * Sun: 61° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 206 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.003", 95°) * approx speed of asteroid's shadow [km/s]: 31.0151 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-378-069458 by 137 Meliboea on 2023 Jan 2 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 134 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -36 3 12 .. .. .. .... 135 0 0 -35 12 36 16 6 28.8 1 107 -30 -36 12 6 -34 14 16 -36 19 18 -34 7 21 .... 136 0 0 -35 28 51 16 6 28.9 1 107 -30 -36 28 28 -34 30 23 -36 35 41 -34 23 27 0.85 137 0 0 -35 45 22 16 6 29.1 2 106 -29 -36 45 6 -34 46 47 -36 52 20 -34 39 50 0.94 138 0 0 -36 2 9 16 6 29.3 3 106 -29 -37 2 1 -35 3 27 -37 9 16 -34 56 30 0.98 139 0 0 -36 19 13 16 6 29.6 4 105 -28 -37 19 12 -35 20 23 -37 26 28 -35 13 25 1.00 140 0 0 -36 36 31 16 6 29.9 5 105 -28 -37 36 38 -35 37 35 -37 43 55 -35 30 36 1.02 141 0 0 -36 54 5 16 6 30.3 6 104 -27 -37 54 19 -35 55 1 -38 1 37 -35 48 1 1.03 142 0 0 -37 11 53 16 6 30.8 6 103 -26 -38 12 15 -36 12 42 -38 19 34 -36 5 41 1.03 143 0 0 -37 29 54 16 6 31.3 7 103 -26 -38 30 24 -36 30 36 -38 37 44 -36 23 35 1.04 144 0 0 -37 48 10 16 6 32.0 8 102 -25 -38 48 47 -36 48 45 -38 56 8 -36 41 42 1.04 145 0 0 -38 6 38 16 6 32.6 9 101 -25 -39 7 23 -37 7 6 -39 14 45 -37 0 2 1.05 146 0 0 -38 25 19 16 6 33.4 10 101 -24 -39 26 12 -37 25 39 -39 33 34 -37 18 35 1.05 147 0 0 -38 44 12 16 6 34.2 11 100 -23 -39 45 12 -37 44 25 -39 52 36 -37 37 20 1.05 148 0 0 -39 3 16 16 6 35.0 12 99 -23 -40 4 24 -38 3 23 -40 11 48 -37 56 17 1.06 149 0 0 -39 22 32 16 6 35.9 12 99 -22 -40 23 47 -38 22 31 -40 31 12 -38 15 24 1.06 150 0 0 -39 41 57 16 6 36.9 13 98 -21 -40 43 19 -38 41 50 -40 50 46 -38 34 42 1.06 151 0 0 -40 1 32 16 6 38.0 14 97 -21 -41 3 2 -39 1 18 -41 10 29 -38 54 10 1.06 152 0 0 -40 21 17 16 6 39.1 15 97 -20 -41 22 54 -39 20 56 -41 30 22 -39 13 47 1.06 153 0 0 -40 41 10 16 6 40.2 16 96 -19 -41 42 54 -39 40 42 -41 50 23 -39 33 33 1.06 154 0 0 -41 1 11 16 6 41.4 16 95 -19 -42 3 2 -40 0 37 -42 10 32 -39 53 27 1.06 155 0 0 -41 21 20 16 6 42.7 17 95 -18 -42 23 18 -40 20 40 -42 30 48 -40 13 28 1.07 156 0 0 -41 41 36 16 6 44.0 18 94 -17 -42 43 40 -40 40 49 -42 51 11 -40 33 37 1.07 157 0 0 -42 1 58 16 6 45.4 19 93 -16 -43 4 8 -41 1 5 -43 11 41 -40 53 52 1.07 158 0 0 -42 22 25 16 6 46.8 19 92 -16 -43 24 42 -41 21 27 -43 32 15 -41 14 14 1.07 159 0 0 -42 42 58 16 6 48.2 20 91 -15 -43 45 21 -41 41 54 -43 52 55 -41 34 40 1.07 160 0 0 -43 3 36 16 6 49.8 21 91 -14 -44 6 4 -42 2 26 -44 13 39 -41 55 11 1.07 161 0 0 -43 24 17 16 6 51.3 22 90 -14 -44 26 51 -42 23 2 -44 34 27 -42 15 46 1.07 162 0 0 -43 45 1 16 6 52.9 22 89 -13 -44 47 41 -42 43 41 -44 55 17 -42 36 25 1.07 163 0 0 -44 5 48 16 6 54.6 23 88 -12 -45 8 34 -43 4 23 -45 16 10 -42 57 7 1.07 164 0 0 -44 26 38 16 6 56.2 24 87 -11 -45 29 28 -43 25 8 -45 37 5 -43 17 51 1.07 165 0 0 -44 47 29 16 6 58.0 25 86 -11 -45 50 24 -43 45 54 -45 58 2 -43 38 36 1.07 166 0 0 -45 8 20 16 6 59.7 25 86 -10 -46 11 20 -44 6 41 -46 18 58 -43 59 23 1.07 167 0 0 -45 29 12 16 7 1.5 26 85 -9 -46 32 16 -44 27 29 -46 39 55 -44 20 11 1.07 168 0 0 -45 50 3 16 7 3.4 27 84 -8 -46 53 11 -44 48 17 -47 0 51 -44 40 58 1.07 169 0 0 -46 10 54 16 7 5.2 27 83 -8 -47 14 6 -45 9 4 -47 21 46 -45 1 44 1.07 170 0 0 -46 31 43 16 7 7.1 28 82 -7 -47 34 58 -45 29 49 -47 42 39 -45 22 30 1.07 171 0 0 -46 52 30 16 7 9.1 28 81 -6 -47 55 49 -45 50 34 -48 3 30 -45 43 14 1.07 172 0 0 -47 13 15 16 7 11.0 29 80 -5 -48 16 36 -46 11 15 -48 24 17 -46 3 55 1.07 173 0 0 -47 33 56 16 7 13.0 30 79 -5 -48 37 20 -46 31 54 -48 45 1 -46 24 33 1.07 174 0 0 -47 54 33 16 7 15.0 30 78 -4 -48 57 59 -46 52 29 -49 5 41 -46 45 8 1.07 175 0 0 -48 15 6 16 7 17.1 31 77 -3 -49 18 34 -47 13 0 -49 26 16 -47 5 39 1.07 176 0 0 -48 35 34 16 7 19.1 31 76 -2 -49 39 4 -47 33 27 -49 46 46 -47 26 6 1.07 177 0 0 -48 55 57 16 7 21.2 32 75 -2 -49 59 28 -47 53 48 -50 7 10 -47 46 27 1.07 178 0 0 -49 16 13 16 7 23.3 33 74 -1 -50 19 46 -48 14 4 -50 27 28 -48 6 42 1.08 179 0 0 -49 36 23 16 7 25.4 33 73 0 -50 39 57 -48 34 13 -50 47 39 -48 26 52 1.08 -180 0 0 -49 56 27 16 7 27.5 34 71 0 -51 0 0 -48 54 16 -51 7 43 -48 46 55 1.08 -179 0 0 -50 16 23 16 7 29.7 34 70 1 -51 19 56 -49 14 12 -51 27 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37 43 -56 35 3 -58 45 14 -56 27 52 1.08 -153 0 0 -57 50 26 16 8 26.2 42 37 18 -58 52 18 -56 49 51 -58 59 48 -56 42 41 1.08 -152 0 0 -58 4 53 16 8 28.3 42 36 19 -59 6 38 -57 4 25 -59 14 7 -56 57 15 1.08 -151 0 0 -58 19 5 16 8 30.4 42 34 19 -59 20 42 -57 18 43 -59 28 11 -57 11 34 1.08 -150 0 0 -58 33 2 16 8 32.5 42 33 20 -59 34 32 -57 32 47 -59 42 0 -57 25 39 1.08 -149 0 0 -58 46 44 16 8 34.5 43 31 20 -59 48 7 -57 46 36 -59 55 33 -57 39 28 1.08 -148 0 0 -59 0 11 16 8 36.5 43 30 21 -60 1 26 -58 0 10 -60 8 52 -57 53 3 1.08 -147 0 0 -59 13 23 16 8 38.6 43 29 22 -60 14 31 -58 13 29 -60 21 55 -58 6 23 1.08 -146 0 0 -59 26 19 16 8 40.6 43 27 22 -60 27 20 -58 26 33 -60 34 44 -58 19 28 1.08 -145 0 0 -59 39 1 16 8 42.5 43 26 23 -60 39 54 -58 39 22 -60 47 17 -58 32 18 1.08 -144 0 0 -59 51 28 16 8 44.5 43 25 23 -60 52 13 -58 51 56 -60 59 35 -58 44 52 1.08 -143 0 0 -60 3 40 16 8 46.5 43 23 24 -61 4 17 -59 4 15 -61 11 38 -58 57 12 1.08 -142 0 0 -60 15 36 16 8 48.4 43 22 24 -61 16 6 -59 16 18 -61 23 26 -59 9 17 1.08 -141 0 0 -60 27 18 16 8 50.3 43 20 25 -61 27 39 -59 28 7 -61 34 58 -59 21 7 1.08 -140 0 0 -60 38 44 16 8 52.3 43 19 25 -61 38 58 -59 39 41 -61 46 16 -59 32 42 1.08 -139 0 0 -60 49 56 16 8 54.1 43 18 26 -61 50 2 -59 51 0 -61 57 19 -59 44 1 1.08 -138 0 0 -61 0 53 16 8 56.0 43 16 26 -62 0 51 -60 2 4 -62 8 7 -59 55 6 1.08 -137 0 0 -61 11 34 16 8 57.9 43 15 27 -62 11 25 -60 12 54 -62 18 40 -60 5 56 1.08 -136 0 0 -61 22 1 16 8 59.7 43 14 27 -62 21 44 -60 23 28 -62 28 58 -60 16 32 1.08 -135 0 0 -61 32 13 16 9 1.6 43 12 28 -62 31 48 -60 33 47 -62 39 2 -60 26 52 1.08 -134 0 0 -61 42 11 16 9 3.4 43 11 28 -62 41 38 -60 43 52 -62 48 50 -60 36 58 1.08 -133 0 0 -61 51 54 16 9 5.2 42 9 29 -62 51 13 -60 53 42 -62 58 25 -60 46 48 1.08 -132 0 0 -62 1 22 16 9 7.0 42 8 29 -63 0 34 -61 3 18 -63 7 44 -60 56 25 1.08 -131 0 0 -62 10 36 16 9 8.7 42 7 29 -63 9 40 -61 12 39 -63 16 50 -61 5 46 1.08 -130 0 0 -62 19 35 16 9 10.5 42 5 30 -63 18 32 -61 21 45 -63 25 40 -61 14 54 1.08 -129 0 0 -62 28 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-66 17 17 -64 12 37 1.08 - 92 0 0 -65 15 3 16 10 6.8 34 319 43 -66 11 12 -64 19 53 -66 17 59 -64 13 20 1.08 - 91 0 0 -65 15 34 16 10 8.0 34 318 44 -66 11 42 -64 20 24 -66 18 30 -64 13 52 1.08 - 90 0 0 -65 15 53 16 10 9.3 34 317 44 -66 12 0 -64 20 43 -66 18 48 -64 14 11 1.08 - 89 0 0 -65 15 59 16 10 10.5 33 315 44 -66 12 7 -64 20 50 -66 18 54 -64 14 17 1.08 - 88 0 0 -65 15 54 16 10 11.7 33 314 44 -66 12 1 -64 20 44 -66 18 49 -64 14 11 1.08 - 87 0 0 -65 15 36 16 10 13.0 33 313 45 -66 11 44 -64 20 26 -66 18 32 -64 13 53 1.08 - 86 0 0 -65 15 6 16 10 14.2 33 312 45 -66 11 15 -64 19 56 -66 18 2 -64 13 23 1.08 - 85 0 0 -65 14 24 16 10 15.4 32 311 45 -66 10 34 -64 19 13 -66 17 21 -64 12 40 1.08 - 84 0 0 -65 13 30 16 10 16.5 32 310 45 -66 9 41 -64 18 18 -66 16 28 -64 11 44 1.08 - 83 0 0 -65 12 24 16 10 17.7 32 309 45 -66 8 36 -64 17 10 -66 15 24 -64 10 37 1.08 - 82 0 0 -65 11 5 16 10 18.9 31 308 46 -66 7 19 -64 15 50 -66 14 7 -64 9 17 1.08 - 81 0 0 -65 9 35 16 10 20.1 31 307 46 -66 5 50 -64 14 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35 38 -62 27 0 1.09 - 56 0 0 -63 23 49 16 10 46.0 22 281 49 -64 21 53 -62 26 48 -64 28 55 -62 20 3 1.09 - 55 0 0 -63 16 45 16 10 46.9 21 280 49 -64 14 56 -62 19 39 -64 21 59 -62 12 52 1.09 - 54 0 0 -63 9 28 16 10 47.8 21 279 49 -64 7 46 -62 12 15 -64 14 49 -62 5 28 1.09 - 53 0 0 -63 1 57 16 10 48.7 20 278 49 -64 0 22 -62 4 38 -64 7 26 -61 57 50 1.09 - 52 0 0 -62 54 12 16 10 49.6 20 277 49 -63 52 44 -61 56 46 -63 59 49 -61 49 58 1.09 - 51 0 0 -62 46 14 16 10 50.4 20 276 49 -63 44 52 -61 48 41 -63 51 58 -61 41 52 1.09 - 50 0 0 -62 38 1 16 10 51.3 19 275 49 -63 36 47 -61 40 22 -63 43 54 -61 33 31 1.10 - 49 0 0 -62 29 34 16 10 52.1 19 274 49 -63 28 27 -61 31 48 -63 35 35 -61 24 57 1.10 - 48 0 0 -62 20 54 16 10 52.9 18 273 49 -63 19 54 -61 23 0 -63 27 3 -61 16 8 1.10 - 47 0 0 -62 11 59 16 10 53.7 18 272 49 -63 11 6 -61 13 58 -63 18 16 -61 7 6 1.10 - 46 0 0 -62 2 49 16 10 54.5 17 272 49 -63 2 5 -61 4 42 -63 9 15 -60 57 48 1.10 - 45 0 0 -61 53 26 16 10 55.3 17 271 49 -62 52 49 -60 55 11 -63 0 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35 2 1.12 - 32 0 0 -59 29 14 16 11 3.8 10 259 48 -60 30 17 -58 29 25 -60 37 41 -58 22 20 1.12 - 31 0 0 -59 16 25 16 11 4.3 10 258 48 -60 17 35 -58 16 30 -60 25 0 -58 9 24 1.13 - 30 0 0 -59 3 22 16 11 4.8 9 257 47 -60 4 40 -58 3 20 -60 12 5 -57 56 13 1.13 - 29 0 0 -58 50 4 16 11 5.3 9 256 47 -59 51 29 -57 49 55 -59 58 55 -57 42 47 1.13 - 28 0 0 -58 36 31 16 11 5.7 8 255 47 -59 38 3 -57 36 15 -59 45 31 -57 29 7 1.14 - 27 0 0 -58 22 44 16 11 6.1 8 254 47 -59 24 23 -57 22 21 -59 31 51 -57 15 12 1.14 - 26 0 0 -58 8 42 16 11 6.5 7 254 46 -59 10 28 -57 8 13 -59 17 57 -57 1 3 1.15 - 25 0 0 -57 54 26 16 11 6.9 6 253 46 -58 56 19 -56 53 50 -59 3 49 -56 46 40 1.15 - 24 0 0 -57 39 55 16 11 7.2 6 252 46 -58 41 54 -56 39 13 -58 49 25 -56 32 2 1.16 - 23 0 0 -57 25 10 16 11 7.5 5 251 46 -58 27 15 -56 24 22 -58 34 47 -56 17 10 1.18 - 22 0 0 -57 10 10 16 11 7.8 5 250 45 -58 12 22 -56 9 16 -58 19 54 -56 2 3 1.19 - 21 0 0 -56 54 56 16 11 8.0 4 249 45 -57 57 14 -55 53 56 -58 4 47 -55 46 43 1.21 - 20 0 0 -56 39 28 16 11 8.2 3 249 45 -57 41 52 -55 38 23 -57 49 26 -55 31 9 1.23 - 19 0 0 -56 23 47 16 11 8.4 3 248 44 -57 26 16 -55 22 36 -57 33 51 -55 15 21 1.26 - 18 0 0 -56 7 51 16 11 8.5 2 247 44 -57 10 26 -55 6 35 -57 18 2 -54 59 20 1.32 - 17 0 0 -55 51 42 16 11 8.7 2 246 44 -56 54 22 -54 50 21 -57 1 59 -54 43 6 1.42 - 16 0 0 -55 35 20 16 11 8.7 1 245 43 -56 38 5 -54 33 54 -56 45 42 -54 26 38 1.66 - 15 0 0 -55 18 44 16 11 8.8 0 244 43 -56 21 34 .. .. .. -56 29 11 .. .. .. 3.00 - 14 0 0 .. .. .... .. .. .. .. .. .. -56 4 50 .. .. .. -56 12 28 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: UCAC4-378-069458 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 32 42.7385 DE: -14 27 13.311 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 32 42.7386 DE: -14 27 13.311 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (137) Meliboea asteroid class: approx. diameter [km]: 140 approx. diameter ["]: 0.055 distance from Earth [AU]: 3.51260 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#123 date of fit: 2022 Nov 25 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): 0.013", 0.003", 94.568° remarks: * orbital elements for (137)Meliboea : Mean anomaly = 279.1260725311 deg Arg. of pericenter = 107.5936079239 deg Long. of node = 202.1728610668 deg Inclination = 13.4313694245 deg Eccentricity = 0.2115122393 Semimajor axis = 3.1251857989 AU Perihelion dist = 2.4641707523 AU Mag: H = 8.23, G = 0.15 Epoch of elements : MJD 59946.67277778 TDT (2023 Jan 02.6728) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1232022Nov25,4.53,2023,1,2,16.146972,-0.135898,-0.717551,17.197195,-3.272327,-0.005020,0.001672,-0.000001,0.000000 -125.7546,-14.5535,-61.21,-22.90,False UCAC4-378-069458,14.54520512,-14.4536973,0.00,12.48,0.00,0.0,0,,14.56582598,-14.5535379,2.04,0.00,0,0,0 137,Meliboea,14.34,140.4,3.5126,0,0,2.966,-8.19,,7.8,0 0,279.0061,2023,1,2,107.5936,202.1729,13.4314,0.21151,3.12519,2.46417,8.25,5.0,0.15 1.060,0.0130,0.0030,95,0.0033,Known errors,-1.00,-1,-1,-1 20230102_069458,59914.09 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org