IOTA/IOTA-ES occultation update for (82) Alkmene / TYC 5558-01041-1 event on 2022 Feb 18, 04:25 UT Visible from South America Summary ------- On 2022 Feb 18 UT, the 59.6 km diameter asteroid (82) Alkmene will occult a 8.7 mag star in the constellation Virgo for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.79 mag to 12.41 mag (the magnitude of the asteroid) for at most 10.750 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: 2022 Feb 18, 04:10 - 2022 Feb 18, 04:40 * geocentric midpoint of event [JD]: 2459628.68435921 * magnitude of target star: 8.65 * magnitude drop [mag]: 3.79 * estimated maximum duration [s]: 10.750 * Moon: 98 % sunlit, 48° distance * Sun: 115° distance * rough path description: South America Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 77 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 5.8 * 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]: 5.5439 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5558-01041-1 by 82 Alkmene on 2022 Feb 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 - 90 0 0 -12 19 38 4 10 37.9 1 102 -51 -12 41 21 -11 58 1 -12 43 20 -11 56 3 .... - 89 0 0 -12 33 33 4 10 38.4 2 102 -52 -12 55 21 -12 11 53 -12 57 20 -12 9 55 0.64 - 88 0 0 -12 48 10 4 10 39.4 3 102 -52 -13 10 1 -12 26 25 -13 12 1 -12 24 27 0.72 - 87 0 0 -13 3 27 4 10 40.9 4 102 -53 -13 25 23 -12 41 38 -13 27 23 -12 39 39 0.75 - 86 0 0 -13 19 24 4 10 42.8 5 102 -54 -13 41 25 -12 57 31 -13 43 26 -12 55 31 0.78 - 85 0 0 -13 36 3 4 10 45.2 6 101 -54 -13 58 8 -13 14 4 -14 0 10 -13 12 5 0.79 - 84 0 0 -13 53 22 4 10 48.1 7 101 -55 -14 15 33 -13 31 19 -14 17 34 -13 29 19 0.80 - 83 0 0 -14 11 22 4 10 51.4 8 101 -55 -14 33 38 -13 49 14 -14 35 41 -13 47 13 0.81 - 82 0 0 -14 30 4 4 10 55.3 9 100 -56 -14 52 25 -14 7 50 -14 54 28 -14 5 49 0.81 - 81 0 0 -14 49 27 4 10 59.7 10 100 -56 -15 11 53 -14 27 8 -15 13 57 -14 25 6 0.82 - 80 0 0 -15 9 30 4 11 4.5 11 100 -56 -15 32 3 -14 47 6 -15 34 7 -14 45 4 0.82 - 79 0 0 -15 30 16 4 11 9.8 12 100 -57 -15 52 54 -15 7 45 -15 54 58 -15 5 42 0.82 - 78 0 0 -15 51 42 4 11 15.7 13 99 -57 -16 14 26 -15 29 6 -16 16 31 -15 27 2 0.83 - 77 0 0 -16 13 49 4 11 22.0 14 99 -57 -16 36 40 -15 51 7 -16 38 45 -15 49 3 0.83 - 76 0 0 -16 36 38 4 11 28.8 15 99 -57 -16 59 35 -16 13 49 -17 1 41 -16 11 45 0.83 - 75 0 0 -17 0 8 4 11 36.2 16 98 -58 -17 23 11 -16 37 13 -17 25 17 -16 35 7 0.83 - 74 0 0 -17 24 18 4 11 44.0 17 98 -58 -17 47 28 -17 1 17 -17 49 35 -16 59 11 0.84 - 73 0 0 -17 49 9 4 11 52.4 18 97 -58 -18 12 26 -17 26 1 -18 14 34 -17 23 55 0.84 - 72 0 0 -18 14 41 4 12 1.3 19 97 -58 -18 38 5 -17 51 26 -18 40 14 -17 49 19 0.84 - 71 0 0 -18 40 54 4 12 10.7 20 97 -58 -19 4 25 -18 17 32 -19 6 34 -18 15 24 0.84 - 70 0 0 -19 7 46 4 12 20.6 21 96 -58 -19 31 24 -18 44 17 -19 33 34 -18 42 9 0.84 - 69 0 0 -19 35 18 4 12 30.9 22 96 -58 -19 59 4 -19 11 42 -20 1 14 -19 9 33 0.84 - 68 0 0 -20 3 30 4 12 41.8 23 95 -57 -20 27 23 -19 39 46 -20 29 34 -19 37 37 0.84 - 67 0 0 -20 32 21 4 12 53.3 24 95 -57 -20 56 21 -20 8 29 -20 58 33 -20 6 19 0.84 - 66 0 0 -21 1 50 4 13 5.2 25 94 -57 -21 25 58 -20 37 51 -21 28 11 -20 35 40 0.84 - 65 0 0 -21 31 57 4 13 17.6 26 93 -57 -21 56 14 -21 7 50 -21 58 27 -21 5 39 0.85 - 64 0 0 -22 2 42 4 13 30.4 27 93 -56 -22 27 6 -21 38 27 -22 29 20 -21 36 15 0.85 - 63 0 0 -22 34 3 4 13 43.8 28 92 -56 -22 58 36 -22 9 41 -23 0 51 -22 7 28 0.85 - 62 0 0 -23 6 1 4 13 57.7 29 92 -55 -23 30 42 -22 41 31 -23 32 57 -22 39 17 0.85 - 61 0 0 -23 38 34 4 14 12.0 30 91 -55 -24 3 23 -23 13 56 -24 5 39 -23 11 42 0.85 - 60 0 0 -24 11 42 4 14 26.8 31 90 -54 -24 36 39 -23 46 56 -24 38 56 -23 44 41 0.85 - 59 0 0 -24 45 23 4 14 42.0 32 89 -54 -25 10 28 -24 20 29 -25 12 46 -24 18 13 0.85 - 58 0 0 -25 19 37 4 14 57.7 33 88 -53 -25 44 51 -24 54 35 -25 47 9 -24 52 18 0.85 - 57 0 0 -25 54 23 4 15 13.8 34 88 -52 -26 19 44 -25 29 12 -26 22 4 -25 26 55 0.85 - 56 0 0 -26 29 39 4 15 30.4 35 87 -52 -26 55 9 -26 4 20 -26 57 29 -26 2 2 0.85 - 55 0 0 -27 5 25 4 15 47.3 36 86 -51 -27 31 2 -26 39 58 -27 33 23 -26 37 39 0.85 - 54 0 0 -27 41 38 4 16 4.6 37 85 -50 -28 7 24 -27 16 3 -28 9 46 -27 13 44 0.84 - 53 0 0 -28 18 18 4 16 22.3 38 84 -49 -28 44 12 -27 52 36 -28 46 35 -27 50 15 0.84 - 52 0 0 -28 55 24 4 16 40.4 39 83 -49 -29 21 26 -28 29 33 -29 23 49 -28 27 12 0.84 - 51 0 0 -29 32 53 4 16 58.8 39 82 -48 -29 59 3 -29 6 55 -30 1 26 -29 4 33 0.84 - 50 0 0 -30 10 44 4 17 17.5 40 80 -47 -30 37 2 -29 44 39 -30 39 26 -29 42 17 0.84 - 49 0 0 -30 48 56 4 17 36.5 41 79 -46 -31 15 21 -30 22 43 -31 17 47 -30 20 21 0.84 - 48 0 0 -31 27 27 4 17 55.9 42 78 -45 -31 54 0 -31 1 7 -31 56 25 -30 58 44 0.84 - 47 0 0 -32 6 15 4 18 15.4 43 77 -44 -32 32 55 -31 39 48 -32 35 21 -31 37 24 0.84 - 46 0 0 -32 45 19 4 18 35.3 43 75 -43 -33 12 5 -32 18 45 -33 14 32 -32 16 20 0.84 - 45 0 0 -33 24 35 4 18 55.3 44 74 -42 -33 51 28 -32 57 55 -33 53 56 -32 55 29 0.84 - 44 0 0 -34 4 4 4 19 15.5 45 72 -42 -34 31 3 -33 37 17 -34 33 32 -33 34 51 0.84 - 43 0 0 -34 43 41 4 19 35.9 45 71 -41 -35 10 47 -34 16 48 -35 13 16 -34 14 22 0.84 - 42 0 0 -35 23 27 4 19 56.5 46 69 -40 -35 50 38 -34 56 28 -35 53 8 -34 54 1 0.84 - 41 0 0 -36 3 17 4 20 17.1 46 68 -39 -36 30 34 -35 36 13 -36 33 4 -35 33 46 0.83 - 40 0 0 -36 43 11 4 20 37.9 47 66 -38 -37 10 34 -36 16 2 -37 13 4 -36 13 34 0.83 - 39 0 0 -37 23 7 4 20 58.7 48 64 -37 -37 50 34 -36 55 53 -37 53 5 -36 53 25 0.83 - 38 0 0 -38 3 2 4 21 19.6 48 62 -36 -38 30 33 -37 35 44 -38 33 5 -37 33 15 0.83 - 37 0 0 -38 42 54 4 21 40.5 48 61 -35 -39 10 29 -38 15 32 -39 13 1 -38 13 2 0.83 - 36 0 0 -39 22 41 4 22 1.4 49 59 -34 -39 50 20 -38 55 15 -39 52 52 -38 52 46 0.83 - 35 0 0 -40 2 21 4 22 22.3 49 57 -33 -40 30 3 -39 34 52 -40 32 36 -39 32 22 0.83 - 34 0 0 -40 41 52 4 22 43.1 49 55 -32 -41 9 37 -40 14 20 -41 12 10 -40 11 50 0.83 - 33 0 0 -41 21 12 4 23 3.9 50 53 -31 -41 49 0 -40 53 38 -41 51 33 -40 51 8 0.83 - 32 0 0 -42 0 20 4 23 24.5 50 51 -30 -42 28 9 -41 32 44 -42 30 42 -41 30 13 0.83 - 31 0 0 -42 39 12 4 23 45.1 50 49 -29 -43 7 3 -42 11 35 -43 9 36 -42 9 4 0.82 - 30 0 0 -43 17 48 4 24 5.5 50 47 -28 -43 45 40 -42 50 10 -43 48 13 -42 47 39 0.82 - 29 0 0 -43 56 5 4 24 25.7 50 45 -27 -44 23 58 -43 28 27 -44 26 31 -43 25 56 0.82 - 28 0 0 -44 34 3 4 24 45.8 51 43 -26 -45 1 55 -44 6 24 -45 4 28 -44 3 53 0.82 - 27 0 0 -45 11 38 4 25 5.7 51 42 -25 -45 39 30 -44 44 0 -45 42 3 -44 41 29 0.82 - 26 0 0 -45 48 50 4 25 25.4 51 40 -24 -46 16 42 -45 21 13 -46 19 15 -45 18 42 0.82 - 25 0 0 -46 25 38 4 25 44.8 51 38 -23 -46 53 28 -45 58 1 -46 56 1 -45 55 31 0.82 - 24 0 0 -47 1 59 4 26 4.1 51 36 -22 -47 29 47 -46 34 24 -47 32 20 -46 31 54 0.82 - 23 0 0 -47 37 53 4 26 23.0 51 34 -21 -48 5 39 -47 10 20 -48 8 12 -47 7 50 0.82 - 22 0 0 -48 13 18 4 26 41.7 50 32 -20 -48 41 1 -47 45 48 -48 43 34 -47 43 18 0.82 - 21 0 0 -48 48 13 4 27 0.1 50 30 -19 -49 15 54 -48 20 46 -49 18 26 -48 18 17 0.82 - 20 0 0 -49 22 38 4 27 18.3 50 28 -18 -49 50 15 -48 55 14 -49 52 47 -48 52 45 0.81 - 19 0 0 -49 56 31 4 27 36.1 50 26 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46 0.81 - 6 0 0 -56 24 38 4 30 59.5 46 4 -7 -56 50 55 -55 58 33 -56 53 19 -55 56 10 0.81 - 5 0 0 -56 50 19 4 31 12.9 45 3 -6 -57 16 29 -56 24 21 -57 18 53 -56 21 59 0.81 - 4 0 0 -57 15 25 4 31 26.0 45 1 -5 -57 41 27 -56 49 34 -57 43 50 -56 47 13 0.81 - 3 0 0 -57 39 55 4 31 38.8 45 360 -5 -58 5 50 -57 14 11 -58 8 12 -57 11 51 0.81 - 2 0 0 -58 3 50 4 31 51.3 44 358 -4 -58 29 37 -57 38 14 -58 31 59 -57 35 54 0.81 - 1 0 0 -58 27 10 4 32 3.6 44 357 -3 -58 52 49 -58 1 42 -58 55 10 -57 59 23 0.81 0 0 0 -58 49 56 4 32 15.5 43 355 -3 -59 15 28 -58 24 35 -59 17 48 -58 22 17 0.81 1 0 0 -59 12 8 4 32 27.2 43 354 -2 -59 37 31 -58 46 55 -59 39 51 -58 44 37 0.81 2 0 0 -59 33 46 4 32 38.5 43 353 -1 -59 59 2 -59 8 40 -60 1 21 -59 6 24 0.81 3 0 0 -59 54 51 4 32 49.6 42 351 -1 -60 19 59 -59 29 53 -60 22 17 -59 27 37 0.81 4 0 0 -60 15 23 4 33 0.5 42 350 0 -60 40 23 -59 50 33 -60 42 40 -59 48 17 0.81 5 0 0 -60 35 22 4 33 11.1 41 349 1 -61 0 15 -60 10 40 -61 2 31 -60 8 25 0.81 6 0 0 -60 54 50 4 33 21.4 41 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14 22 -68 57 49 -68 12 29 0.82 57 0 0 -68 36 29 4 38 32.1 21 292 23 -68 57 17 -68 15 46 -68 59 12 -68 13 53 0.82 58 0 0 -68 37 37 4 38 35.6 21 291 23 -68 58 26 -68 16 55 -69 0 20 -68 15 2 0.82 59 0 0 -68 38 31 4 38 39.0 21 290 23 -68 59 19 -68 17 50 -69 1 13 -68 15 57 0.82 60 0 0 -68 39 10 4 38 42.4 20 289 23 -68 59 58 -68 18 29 -69 1 52 -68 16 36 0.82 61 0 0 -68 39 34 4 38 45.7 20 288 24 -69 0 22 -68 18 53 -69 2 16 -68 17 0 0.82 62 0 0 -68 39 43 4 38 49.0 20 287 24 -69 0 31 -68 19 2 -69 2 25 -68 17 9 0.82 63 0 0 -68 39 37 4 38 52.2 19 286 24 -69 0 26 -68 18 55 -69 2 20 -68 17 2 0.83 64 0 0 -68 39 17 4 38 55.4 19 285 25 -69 0 5 -68 18 34 -69 2 0 -68 16 41 0.83 65 0 0 -68 38 41 4 38 58.5 19 284 25 -68 59 30 -68 17 58 -69 1 25 -68 16 5 0.83 66 0 0 -68 37 51 4 39 1.5 18 283 25 -68 58 41 -68 17 7 -69 0 35 -68 15 14 0.83 67 0 0 -68 36 46 4 39 4.5 18 282 26 -68 57 37 -68 16 1 -68 59 31 -68 14 7 0.83 68 0 0 -68 35 25 4 39 7.4 18 281 26 -68 56 17 -68 14 39 -68 58 12 -68 12 46 0.83 69 0 0 -68 33 50 4 39 10.3 17 280 26 -68 54 43 -68 13 3 -68 56 38 -68 11 9 0.83 70 0 0 -68 32 0 4 39 13.1 17 279 27 -68 52 55 -68 11 11 -68 54 50 -68 9 18 0.83 71 0 0 -68 29 55 4 39 15.9 16 278 27 -68 50 51 -68 9 4 -68 52 46 -68 7 11 0.83 72 0 0 -68 27 34 4 39 18.6 16 277 27 -68 48 32 -68 6 42 -68 50 28 -68 4 48 0.83 73 0 0 -68 24 59 4 39 21.3 16 276 27 -68 45 59 -68 4 5 -68 47 54 -68 2 11 0.83 74 0 0 -68 22 8 4 39 23.9 15 275 28 -68 43 10 -68 1 12 -68 45 5 -67 59 17 0.83 75 0 0 -68 19 1 4 39 26.5 15 274 28 -68 40 6 -67 58 3 -68 42 1 -67 56 9 0.84 76 0 0 -68 15 39 4 39 29.0 15 274 28 -68 36 46 -67 54 39 -68 38 42 -67 52 44 0.84 77 0 0 -68 12 2 4 39 31.5 14 273 29 -68 33 11 -67 50 59 -68 35 8 -67 49 4 0.84 78 0 0 -68 8 9 4 39 33.9 14 272 29 -68 29 21 -67 47 3 -68 31 17 -67 45 8 0.84 79 0 0 -68 4 0 4 39 36.3 13 271 29 -68 25 15 -67 42 51 -68 27 11 -67 40 56 0.84 80 0 0 -67 59 35 4 39 38.6 13 270 30 -68 20 53 -67 38 23 -68 22 50 -67 36 27 0.84 81 0 0 -67 54 53 4 39 40.9 13 269 30 -68 16 15 -67 33 39 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4 40 5.1 7 257 34 -66 50 20 -66 5 54 -66 52 22 -66 3 53 0.87 95 0 0 -66 19 15 4 40 6.5 7 256 34 -66 41 37 -65 57 1 -66 43 40 -65 55 0 0.87 96 0 0 -66 10 8 4 40 7.9 7 255 34 -66 32 35 -65 47 48 -66 34 38 -65 45 47 0.88 97 0 0 -66 0 41 4 40 9.1 6 254 35 -66 23 14 -65 38 16 -66 25 17 -65 36 14 0.88 98 0 0 -65 50 54 4 40 10.4 6 253 35 -66 13 32 -65 28 23 -66 15 36 -65 26 20 0.89 99 0 0 -65 40 46 4 40 11.5 5 252 35 -66 3 30 -65 18 10 -66 5 35 -65 16 7 0.89 100 0 0 -65 30 19 4 40 12.5 5 251 35 -65 53 8 -65 7 37 -65 55 14 -65 5 33 0.90 101 0 0 -65 19 30 4 40 13.5 4 250 36 -65 42 25 -64 56 42 -65 44 31 -64 54 37 0.91 102 0 0 -65 8 20 4 40 14.4 4 249 36 -65 31 21 -64 45 26 -65 33 28 -64 43 21 0.92 103 0 0 -64 56 48 4 40 15.2 3 248 36 -65 19 56 -64 33 48 -65 22 3 -64 31 43 0.93 104 0 0 -64 44 55 4 40 15.9 3 247 37 -65 8 9 -64 21 49 -65 10 16 -64 19 43 0.95 105 0 0 -64 32 39 4 40 16.5 3 247 37 -64 55 59 -64 9 27 -64 58 8 -64 7 20 0.97 106 0 0 -64 20 1 4 40 17.0 2 246 37 -64 43 28 -63 56 42 -64 45 37 -63 54 35 1.01 107 0 0 -64 7 0 4 40 17.4 2 245 37 -64 30 33 -63 43 35 -64 32 43 -63 41 27 1.07 108 0 0 -63 53 36 4 40 17.8 1 244 38 -64 17 16 -63 30 5 -64 19 26 -63 27 56 1.18 109 0 0 -63 39 48 4 40 18.0 1 243 38 -64 3 35 -63 16 11 -64 5 46 -63 14 2 1.48 110 0 0 -63 25 37 4 40 18.0 0 242 38 -63 49 30 .. .. .. -63 51 42 .. .. .. 6.88 Uncertainty in time = +/- 6 secs Prediction of 2022 Feb 14.8 Data for the target star ------------------------ * name: TYC 5558-01041-1 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 09 56.3563 DE: -12 09 40.066 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 09 56.3564 DE: -12 09 40.066 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.800,0.700) * V mag [mag]: 8.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (82) Alkmene asteroid class: approx. diameter [km]: 60 approx. diameter ["]: 0.047 distance from Earth [AU]: 1.74410 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#123 date of fit: 2022 Feb 04 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", 113.263° remarks: * orbital elements for (82)Alkmene : Mean anomaly = 36.4765837886 deg Arg. of pericenter = 111.0499247312 deg Long. of node = 25.4373489183 deg Inclination = 2.8262312562 deg Eccentricity = 0.2204647522 Semimajor axis = 2.7640309225 AU Perihelion dist = 2.1546595301 AU Mag: H = 8.27, G = 0.28 Epoch of elements : MJD 59628.18444444 TDT (2022 Feb 18.1844) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1232022Feb04,10.75,2022,2,18,4.424621,-0.284863,-0.563317,2.793938,-1.409093,-0.004871,0.001687,0.000000,0.000000 -1.7076,-12.2654,117.11,-11.65,False TYC 5558-01041-1,14.16565454,-12.1611294,0.00,8.65,0.00,0.0,0,,14.18541803,-12.2653659,3.79,0.00,0,0,0 82,Alkmene,12.41,59.6,1.7441,0,0,0.961,-7.10,,3.2 0,36.4370,2022,2,18,111.0499,25.4373,2.8262,0.22046,2.76403,2.15466,8.28,5.0,0.15 1.046,0.0257,0.0015,113,0.0021,Known errors,-1.00,-1,-1,-1 20220218_1041-1,59624.80 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Feb 14, 19:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org