IOTA/IOTA-ES occultation update for (101) Helena / TYC 7344-01290-1 event on 2021 Feb 25, 08:06 UT Visible from South America Summary ------- On 2021 Feb 25 UT, the 65 km diameter asteroid (101) Helena will occult a 11.7 mag star in the constellation Scorpius 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 1.84 mag to 13.34 mag (the magnitude of the asteroid) for at most 3.1 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, astrometry for the asteroid kindly provided by Bill Owen, 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: 2021 Feb 25, 08:01 - 2021 Feb 25, 08:11 * geocentric midpoint of event [JD]: 2459270.83792083 * magnitude of target star: 11.72 * magnitude drop [mag]: 1.84 * estimated maximum duration [s]: 3.1 * Moon: 95 % sunlit, 120° distance * Sun: 86° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 65 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.009", 100°) * approx speed of asteroid's shadow [km/s]: 20.6864 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7344-01290-1 by 101 Helena on 2021 Feb 25 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 -107 0 0 17 2 6 8 1 28.7 1 123 -77 16 40 55 17 23 16 16 29 41 17 34 29 .... -106 0 0 16 23 36 8 1 28.8 2 124 -77 16 2 20 16 44 52 15 51 4 16 56 8 0.15 -105 0 0 15 44 27 8 1 29.0 3 124 -76 15 23 6 16 5 48 15 11 46 16 17 7 0.12 -104 0 0 15 4 39 8 1 29.4 4 124 -76 14 43 12 15 26 5 14 31 49 15 37 27 0.10 -103 0 0 14 24 12 8 1 29.9 5 125 -75 14 2 39 14 45 44 13 51 14 14 57 8 0.10 -102 0 0 13 43 7 8 1 30.5 6 125 -74 13 21 29 14 4 44 13 10 1 14 16 12 0.09 -101 0 0 13 1 25 8 1 31.3 8 125 -74 12 39 42 13 23 8 12 28 12 13 34 38 0.09 -100 0 0 12 19 8 8 1 32.2 9 125 -73 11 57 19 12 40 55 11 45 46 12 52 28 0.09 - 99 0 0 11 36 14 8 1 33.3 10 125 -72 11 14 21 11 58 7 11 2 45 12 9 42 0.08 - 98 0 0 10 52 47 8 1 34.5 11 126 -71 10 30 49 11 14 44 10 19 10 11 26 22 0.08 - 97 0 0 10 8 46 8 1 35.9 12 126 -70 9 46 44 10 30 48 9 35 2 10 42 29 0.08 - 96 0 0 9 24 14 8 1 37.4 14 126 -69 9 2 7 9 46 20 8 50 23 9 58 3 0.08 - 95 0 0 8 39 11 8 1 39.0 15 126 -68 8 16 59 9 1 22 8 5 13 9 13 7 0.08 - 94 0 0 7 53 38 8 1 40.8 16 126 -67 7 31 23 8 15 53 7 19 34 8 27 41 0.08 - 93 0 0 7 7 38 8 1 42.8 17 126 -66 6 45 18 7 29 57 6 33 28 7 41 47 0.08 - 92 0 0 6 21 11 8 1 44.9 19 126 -65 5 58 48 6 43 34 5 46 55 6 55 26 0.08 - 91 0 0 5 34 20 8 1 47.1 20 127 -64 5 11 52 5 56 46 4 59 58 6 8 40 0.08 - 90 0 0 4 47 5 8 1 49.6 21 127 -63 4 24 34 5 9 35 4 12 38 5 21 30 0.08 - 89 0 0 3 59 29 8 1 52.1 23 127 -62 3 36 55 4 22 2 3 24 57 4 33 59 0.08 - 88 0 0 3 11 33 8 1 54.8 24 127 -60 2 48 56 3 34 10 2 36 57 3 46 8 0.08 - 87 0 0 2 23 20 8 1 57.7 25 127 -59 2 0 40 2 45 59 1 48 39 2 57 59 0.08 - 86 0 0 1 34 51 8 2 0.7 26 127 -58 1 12 9 1 57 32 1 0 6 2 9 33 0.08 - 85 0 0 0 46 8 8 2 3.9 28 127 -57 0 23 23 1 8 51 0 11 20 1 20 54 0.08 - 84 0 0 - 0 2 47 8 2 7.2 29 127 -56 - 0 25 33 0 19 59 - 0 37 38 0 32 2 0.08 - 83 0 0 - 0 51 51 8 2 10.7 30 127 -54 - 1 14 39 - 0 29 4 - 1 26 45 - 0 17 0 0.08 - 82 0 0 - 1 41 3 8 2 14.3 32 127 -53 - 2 3 52 - 1 18 15 - 2 15 59 - 1 6 10 0.07 - 81 0 0 - 2 30 20 8 2 18.0 33 127 -52 - 2 53 11 - 2 7 31 - 3 5 18 - 1 55 25 0.07 - 80 0 0 - 3 19 41 8 2 21.9 34 127 -51 - 3 42 32 - 2 56 51 - 3 54 39 - 2 44 45 0.07 - 79 0 0 - 4 9 3 8 2 25.9 35 126 -50 - 4 31 54 - 3 46 12 - 4 44 2 - 3 34 5 0.07 - 78 0 0 - 4 58 23 8 2 30.1 37 126 -48 - 5 21 15 - 4 35 32 - 5 33 22 - 4 23 26 0.07 - 77 0 0 - 5 47 40 8 2 34.3 38 126 -47 - 6 10 32 - 5 24 49 - 6 22 39 - 5 12 43 0.07 - 76 0 0 - 6 36 51 8 2 38.7 39 126 -46 - 6 59 43 - 6 14 1 - 7 11 50 - 6 1 55 0.07 - 75 0 0 - 7 25 55 8 2 43.2 41 126 -45 - 7 48 45 - 7 3 5 - 8 0 52 - 6 51 0 0.07 - 74 0 0 - 8 14 49 8 2 47.8 42 126 -43 - 8 37 38 - 7 52 0 - 8 49 44 - 7 39 55 0.07 - 73 0 0 - 9 3 30 8 2 52.5 43 125 -42 - 9 26 18 - 8 40 43 - 9 38 24 - 8 28 38 0.07 - 72 0 0 - 9 51 58 8 2 57.3 45 125 -41 -10 14 44 - 9 29 12 -10 26 49 - 9 17 8 0.07 - 71 0 0 -10 40 9 8 3 2.2 46 125 -40 -11 2 53 -10 17 25 -11 14 57 -10 5 22 0.07 - 70 0 0 -11 28 2 8 3 7.2 47 125 -39 -11 50 44 -11 5 20 -12 2 46 -10 53 19 0.07 - 69 0 0 -12 15 34 8 3 12.3 48 124 -37 -12 38 14 -11 52 55 -12 50 15 -11 40 55 0.07 - 68 0 0 -13 2 45 8 3 17.5 50 124 -36 -13 25 22 -12 40 9 -13 37 21 -12 28 10 0.07 - 67 0 0 -13 49 32 8 3 22.7 51 124 -35 -14 12 6 -13 26 58 -14 24 4 -13 15 1 0.07 - 66 0 0 -14 35 53 8 3 28.0 52 123 -34 -14 58 23 -14 13 23 -15 10 20 -14 1 27 0.07 - 65 0 0 -15 21 46 8 3 33.3 53 123 -33 -15 44 14 -14 59 20 -15 56 8 -14 47 26 0.07 - 64 0 0 -16 7 11 8 3 38.7 55 123 -31 -16 29 35 -15 44 48 -16 41 27 -15 32 57 0.07 - 63 0 0 -16 52 6 8 3 44.2 56 122 -30 -17 14 25 -16 29 47 -17 26 15 -16 17 57 0.07 - 62 0 0 -17 36 28 8 3 49.7 57 122 -29 -17 58 43 -17 14 13 -18 10 31 -17 2 26 0.07 - 61 0 0 -18 20 17 8 3 55.2 58 121 -28 -18 42 28 -17 58 7 -18 54 14 -17 46 22 0.07 - 60 0 0 -19 3 32 8 4 0.8 59 121 -27 -19 25 39 -18 41 27 -19 37 22 -18 29 44 0.07 - 59 0 0 -19 46 12 8 4 6.4 61 120 -25 -20 8 13 -19 24 11 -20 19 54 -19 12 31 0.07 - 58 0 0 -20 28 14 8 4 12.0 62 119 -24 -20 50 11 -20 6 18 -21 1 49 -19 54 41 0.07 - 57 0 0 -21 9 39 8 4 17.6 63 119 -23 -21 31 31 -20 47 48 -21 43 6 -20 36 14 0.07 - 56 0 0 -21 50 26 8 4 23.3 64 118 -22 -22 12 12 -21 28 40 -22 23 45 -21 17 8 0.07 - 55 0 0 -22 30 33 8 4 28.9 65 118 -21 -22 52 14 -22 8 52 -23 3 44 -21 57 23 0.07 - 54 0 0 -23 9 59 8 4 34.6 66 117 -20 -23 31 35 -22 48 24 -23 43 2 -22 36 58 0.06 - 53 0 0 -23 48 46 8 4 40.2 68 116 -19 -24 10 16 -23 27 16 -24 21 40 -23 15 53 0.06 - 52 0 0 -24 26 50 8 4 45.9 69 115 -18 -24 48 15 -24 5 26 -24 59 36 -23 54 6 0.06 - 51 0 0 -25 4 13 8 4 51.5 70 114 -17 -25 25 32 -24 42 55 -25 36 50 -24 31 38 0.06 - 50 0 0 -25 40 54 8 4 57.1 71 113 -15 -26 2 7 -25 19 41 -26 13 22 -25 8 27 0.06 - 49 0 0 -26 16 52 8 5 2.8 72 112 -14 -26 37 59 -25 55 45 -26 49 11 -25 44 34 0.06 - 48 0 0 -26 52 7 8 5 8.3 73 111 -13 -27 13 9 -26 31 6 -27 24 17 -26 19 58 0.06 - 47 0 0 -27 26 39 8 5 13.9 74 110 -12 -27 47 35 -27 5 44 -27 58 40 -26 54 39 0.06 - 46 0 0 -28 0 28 8 5 19.5 75 109 -11 -28 21 18 -27 39 39 -28 32 20 -27 28 37 0.06 - 45 0 0 -28 33 34 8 5 25.0 76 107 -10 -28 54 17 -28 12 50 -29 5 17 -28 1 52 0.06 - 44 0 0 -29 5 56 8 5 30.5 77 106 -9 -29 26 33 -28 45 18 -29 37 30 -28 34 23 0.06 - 43 0 0 -29 37 34 8 5 35.9 78 104 -8 -29 58 6 -29 17 3 -30 8 59 -29 6 10 0.06 - 42 0 0 -30 8 30 8 5 41.3 79 102 -7 -30 28 56 -29 48 4 -30 39 46 -29 37 15 0.06 - 41 0 0 -30 38 42 8 5 46.7 80 100 -6 -30 59 2 -30 18 22 -31 9 49 -30 7 36 0.06 - 40 0 0 -31 8 11 8 5 52.1 81 97 -5 -31 28 25 -30 47 57 -31 39 9 -30 37 13 0.06 - 39 0 0 -31 36 56 8 5 57.4 82 94 -4 -31 57 5 -31 16 48 -32 7 46 -31 6 8 0.06 - 38 0 0 -32 5 0 8 6 2.6 82 90 -3 -32 25 2 -31 44 57 -32 35 40 -31 34 20 0.06 - 37 0 0 -32 32 20 8 6 7.9 83 85 -2 -32 52 17 -32 12 23 -33 2 52 -32 1 49 0.06 - 36 0 0 -32 58 58 8 6 13.0 84 79 -2 -33 18 50 -32 39 7 -33 29 22 -32 28 36 0.07 - 35 0 0 -33 24 55 8 6 18.2 85 72 -1 -33 44 41 -33 5 9 -33 55 9 -32 54 41 0.07 - 34 0 0 -33 50 9 8 6 23.3 85 62 0 -34 9 50 -33 30 29 -34 20 16 -33 20 4 0.07 - 33 0 0 -34 14 42 8 6 28.3 85 49 1 -34 34 18 -33 55 8 -34 44 40 -33 44 45 0.07 - 32 0 0 -34 38 35 8 6 33.4 86 34 2 -34 58 4 -34 19 5 -35 8 24 -34 8 45 0.07 - 31 0 0 -35 1 46 8 6 38.3 86 18 3 -35 21 10 -34 42 22 -35 31 28 -34 32 5 0.08 - 30 0 0 -35 24 17 8 6 43.2 85 3 4 -35 43 36 -35 4 58 -35 53 51 -34 54 44 0.07 - 29 0 0 -35 46 8 8 6 48.1 85 350 5 -36 5 22 -35 26 54 -36 15 34 -35 16 42 0.07 - 28 0 0 -36 7 19 8 6 53.0 85 340 6 -36 26 29 -35 48 10 -36 36 38 -35 38 1 0.07 - 27 0 0 -36 27 51 8 6 57.7 84 332 6 -36 46 56 -36 8 47 -36 57 3 -35 58 41 0.07 - 26 0 0 -36 47 45 8 7 2.5 83 326 7 -37 6 45 -36 28 45 -37 16 49 -36 18 41 0.06 - 25 0 0 -37 7 0 8 7 7.2 83 321 8 -37 25 55 -36 48 5 -37 35 57 -36 38 3 0.06 - 24 0 0 -37 25 36 8 7 11.8 82 317 9 -37 44 27 -37 6 46 -37 54 27 -36 56 47 0.06 - 23 0 0 -37 43 36 8 7 16.4 81 314 10 -38 2 22 -37 24 49 -38 12 19 -37 14 52 0.06 - 22 0 0 -38 0 57 8 7 21.0 81 311 11 -38 19 40 -37 42 15 -38 29 35 -37 32 21 0.06 - 21 0 0 -38 17 42 8 7 25.5 80 309 11 -38 36 20 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54 41 -42 39 16 -41 45 21 0.06 5 0 0 -42 14 49 8 9 8.9 60 279 31 -42 32 25 -41 57 12 -42 41 46 -41 47 52 0.06 6 0 0 -42 16 49 8 9 12.4 59 278 32 -42 34 25 -41 59 13 -42 43 45 -41 49 53 0.06 7 0 0 -42 18 19 8 9 15.9 58 277 32 -42 35 55 -42 0 43 -42 45 15 -41 51 24 0.06 8 0 0 -42 19 19 8 9 19.3 58 276 33 -42 36 54 -42 1 43 -42 46 14 -41 52 24 0.06 9 0 0 -42 19 49 8 9 22.7 57 276 34 -42 37 24 -42 2 13 -42 46 44 -41 52 54 0.06 10 0 0 -42 19 48 8 9 26.1 56 275 34 -42 37 24 -42 2 13 -42 46 43 -41 52 54 0.06 11 0 0 -42 19 18 8 9 29.5 55 274 35 -42 36 53 -42 1 42 -42 46 13 -41 52 23 0.06 12 0 0 -42 18 17 8 9 32.8 55 273 36 -42 35 53 -42 0 42 -42 45 13 -41 51 22 0.06 13 0 0 -42 16 47 8 9 36.1 54 272 37 -42 34 23 -41 59 11 -42 43 43 -41 49 51 0.06 14 0 0 -42 14 46 8 9 39.3 53 272 37 -42 32 23 -41 57 9 -42 41 43 -41 47 49 0.06 15 0 0 -42 12 15 8 9 42.6 52 271 38 -42 29 53 -41 54 38 -42 39 13 -41 45 17 0.06 16 0 0 -42 9 14 8 9 45.8 52 270 39 -42 26 52 -41 51 36 -42 36 13 -41 42 15 0.06 17 0 0 -42 5 42 8 9 49.0 51 269 39 -42 23 22 -41 48 3 -42 32 43 -41 38 42 0.06 18 0 0 -42 1 41 8 9 52.1 50 269 40 -42 19 21 -41 44 0 -42 28 43 -41 34 39 0.06 19 0 0 -41 57 8 8 9 55.3 49 268 41 -42 14 50 -41 39 27 -42 24 13 -41 30 4 0.06 20 0 0 -41 52 5 8 9 58.4 49 267 41 -42 9 48 -41 34 23 -42 19 12 -41 24 59 0.06 21 0 0 -41 46 32 8 10 1.4 48 266 42 -42 4 16 -41 28 47 -42 13 40 -41 19 23 0.06 22 0 0 -41 40 27 8 10 4.5 47 266 43 -41 58 13 -41 22 41 -42 7 38 -41 13 16 0.06 23 0 0 -41 33 51 8 10 7.5 46 265 43 -41 51 39 -41 16 4 -42 1 5 -41 6 38 0.06 24 0 0 -41 26 45 8 10 10.5 46 264 44 -41 44 34 -41 8 55 -41 54 2 -40 59 29 0.06 25 0 0 -41 19 7 8 10 13.4 45 264 45 -41 36 58 -41 1 15 -41 46 27 -40 51 47 0.06 26 0 0 -41 10 57 8 10 16.4 44 263 46 -41 28 51 -40 53 3 -41 38 20 -40 43 34 0.06 27 0 0 -41 2 16 8 10 19.3 43 262 46 -41 20 12 -40 44 20 -41 29 42 -40 34 50 0.06 28 0 0 -40 53 2 8 10 22.1 43 261 47 -41 11 1 -40 35 4 -41 20 33 -40 25 32 0.06 29 0 0 -40 43 17 8 10 25.0 42 261 48 -41 1 18 -40 25 16 -41 10 51 -40 15 43 0.06 30 0 0 -40 32 59 8 10 27.8 41 260 48 -40 51 2 -40 14 55 -41 0 37 -40 5 21 0.06 31 0 0 -40 22 8 8 10 30.6 40 259 49 -40 40 15 -40 4 2 -40 49 51 -39 54 26 0.06 32 0 0 -40 10 45 8 10 33.3 39 259 50 -40 28 54 -39 52 35 -40 38 32 -39 42 58 0.06 33 0 0 -39 58 48 8 10 36.1 39 258 50 -40 17 0 -39 40 36 -40 26 40 -39 30 57 0.06 34 0 0 -39 46 18 8 10 38.7 38 257 51 -40 4 33 -39 28 2 -40 14 14 -39 18 22 0.06 35 0 0 -39 33 14 8 10 41.4 37 257 52 -39 51 33 -39 14 55 -40 1 15 -39 5 13 0.07 36 0 0 -39 19 36 8 10 44.0 36 256 53 -39 37 58 -39 1 14 -39 47 43 -38 51 30 0.07 37 0 0 -39 5 24 8 10 46.6 35 255 53 -39 23 50 -38 46 58 -39 33 36 -38 37 12 0.07 38 0 0 -38 50 37 8 10 49.2 35 255 54 -39 9 6 -38 32 8 -39 18 55 -38 22 20 0.07 39 0 0 -38 35 15 8 10 51.7 34 254 55 -38 53 48 -38 16 42 -39 3 39 -38 6 52 0.07 40 0 0 -38 19 18 8 10 54.2 33 253 55 -38 37 55 -38 0 41 -38 47 47 -37 50 49 0.07 41 0 0 -38 2 45 8 10 56.6 32 253 56 -38 21 26 -37 44 4 -38 31 21 -37 34 10 0.07 42 0 0 -37 45 37 8 10 59.0 31 252 57 -38 4 22 -37 26 52 -38 14 19 -37 16 56 0.07 43 0 0 -37 27 52 8 11 1.4 30 252 57 -37 46 41 -37 9 3 -37 56 40 -36 59 4 0.07 44 0 0 -37 9 31 8 11 3.7 29 251 58 -37 28 24 -36 50 37 -37 38 25 -36 40 36 0.07 45 0 0 -36 50 32 8 11 6.0 29 250 59 -37 9 31 -36 31 34 -37 19 34 -36 21 32 0.07 46 0 0 -36 30 57 8 11 8.2 28 250 60 -36 50 0 -36 11 55 -37 0 5 -36 1 49 0.07 47 0 0 -36 10 44 8 11 10.4 27 249 60 -36 29 51 -35 51 37 -36 39 59 -35 41 29 0.07 48 0 0 -35 49 53 8 11 12.5 26 248 61 -36 9 5 -35 30 41 -36 19 16 -35 20 31 0.07 49 0 0 -35 28 24 8 11 14.6 25 248 62 -35 47 41 -35 9 8 -35 57 54 -34 58 55 0.07 50 0 0 -35 6 17 8 11 16.7 24 247 62 -35 25 38 -34 46 55 -35 35 54 -34 36 40 0.07 51 0 0 -34 43 30 8 11 18.6 23 247 63 -35 2 57 -34 24 4 -35 13 15 -34 13 46 0.07 52 0 0 -34 20 5 8 11 20.6 22 246 64 -34 39 37 -34 0 34 -34 49 58 -33 50 13 0.07 53 0 0 -33 56 0 8 11 22.4 21 246 64 -34 15 37 -33 36 24 -34 26 1 -33 26 0 0.07 54 0 0 -33 31 16 8 11 24.2 21 245 65 -33 50 58 -33 11 34 -34 1 24 -33 1 8 0.07 55 0 0 -33 5 52 8 11 26.0 20 244 65 -33 25 39 -32 46 5 -33 36 8 -32 35 36 0.08 56 0 0 -32 39 47 8 11 27.7 19 244 66 -32 59 40 -32 19 55 -33 10 12 -32 9 24 0.08 57 0 0 -32 13 3 8 11 29.3 18 243 67 -32 33 0 -31 53 5 -32 43 35 -31 42 31 0.08 58 0 0 -31 45 38 8 11 30.8 17 243 67 -32 5 41 -31 25 35 -32 16 19 -31 14 58 0.08 59 0 0 -31 17 32 8 11 32.3 16 242 68 -31 37 40 -30 57 24 -31 48 21 -30 46 44 0.08 60 0 0 -30 48 45 8 11 33.7 15 242 68 -31 8 59 -30 28 32 -31 19 43 -30 17 49 0.08 61 0 0 -30 19 18 8 11 35.1 14 241 69 -30 39 37 -29 58 59 -30 50 24 -29 48 13 0.08 62 0 0 -29 49 10 8 11 36.3 13 241 69 -30 9 34 -29 28 45 -30 20 24 -29 17 57 0.08 63 0 0 -29 18 20 8 11 37.5 12 240 70 -29 38 51 -28 57 50 -29 49 43 -28 46 59 0.08 64 0 0 -28 46 50 8 11 38.6 11 240 70 -29 7 26 -28 26 15 -29 18 21 -28 15 20 0.09 65 0 0 -28 14 39 8 11 39.5 10 239 70 -28 35 20 -27 53 58 -28 46 18 -27 43 1 0.09 66 0 0 -27 41 47 8 11 40.4 9 239 71 -28 2 34 -27 21 1 -28 13 35 -27 10 0 0.09 67 0 0 -27 8 14 8 11 41.3 8 238 71 -27 29 6 -26 47 22 -27 40 10 -26 36 19 0.10 68 0 0 -26 34 1 8 11 42.0 7 238 71 -26 54 58 -26 13 4 -27 6 5 -26 1 58 0.10 69 0 0 -25 59 7 8 11 42.6 5 237 71 -26 20 10 -25 38 5 -26 31 20 -25 26 56 0.11 70 0 0 -25 23 34 8 11 43.1 4 237 71 -25 44 42 -25 2 26 -25 55 55 -24 51 15 0.12 71 0 0 -24 47 21 8 11 43.5 3 237 71 -25 8 34 -24 26 8 -25 19 50 -24 14 54 0.13 72 0 0 -24 10 29 8 11 43.8 2 236 71 -24 31 47 -23 49 11 -24 43 5 -23 37 54 0.17 73 0 0 -23 32 58 8 11 44.0 1 236 71 -23 54 22 -23 11 35 -24 5 42 -23 0 15 0.26 Uncertainty in time = +/- 1 secs Prediction of 2020 Dec 31.0 Data for the target star ------------------------ * name: TYC 7344-01290-1 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 27 54.0531 DE: -31 34 56.381 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 27 54.0532 DE: -31 34 56.381 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (101) Helena asteroid class: approx. diameter [km]: 65 approx. diameter ["]: 0.036 distance from Earth [AU]: 2.48630 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: Preston date of fit: 2020 Dec 31 source of used astrometry: MPC, FASTT, TMO number of used observations: 2234 number of rejected observations: 8 time covered by the observations: 1962 Mar 13 - 2020 Jul 19 1 sigma uncertainty ellipse (major, minor, PA): 0.016", 0.009", 99.7° remarks: * orbital elements for (101)Helena : Mean anomaly = 272.34686720 deg Arg. of pericenter = 348.42225796 deg Long. of node = 343.38483525 deg Inclination = 10.19762096 deg Eccentricity = 0.14079232 Semimajor axis = 2.58255818 AU Perihelion dist = 2.21895381 AU Mag: H = 8.20, G = 0.15 Epoch of elements : MJD 59270.33800000 TDT (2021 Feb 25.3380) ------ occelmnt file for Occult BEGIN ----------------------------------- Preston2020Dec31,3.1,2021,2,25,8.1101,-0.02329,-0.05379,10.69068,-4.69443,-0.00571,0.00084,0.00000,0.00000 -29.7528,-31.6271,61.61,-8.96,False TYC 7344-01290-1,16.46501475,-31.5823280,0.00,11.72,0.00,0.0,0,,16.48717455,-31.6270742 101,Helena,13.34,65.0,2.4863,0,0,2.961,-16.61,,3.2 0,272.2666,2021,2,25,348.4223,343.3848,10.1976,0.14079,2.58256,2.21895,8.20,5.0,0.15 1.265,0.0160,0.0090,100,0.0096,Known errors 20210225_1290-1,59214.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2020 Dec 31, 01:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org