IOTA/IOTA-ES occultation update for (331) Etheridgea / HIP 5837 event on 2021 Feb 04, 11:35 UT Visible from S Australia Summary ------- On 2021 Feb 04 UT, the 75 km diameter asteroid (331) Etheridgea will occult a 7.9 mag star in the constellation Pisces for observers along a path across S Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.43 mag to 15.33 mag (the magnitude of the asteroid) for at most 2.5 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 04, 11:33 - 2021 Feb 04, 11:38 * geocentric midpoint of event [JD]: 2459249.98330417 * magnitude of target star: 7.90 * magnitude drop [mag]: 7.43 * estimated maximum duration [s]: 2.5 * Moon: 54 % sunlit, 159° distance * Sun: 65° distance * rough path description: S Australia Additional comments ------------------- duplicated source flag The occultation path -------------------- * approximate projected width [km]: 131 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.012) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.009", 61°) * approx speed of asteroid's shadow [km/s]: 30.0449 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 5837 by 331 Etheridgea on 2021 Feb 4 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 ' " Longitude Longitude Longitude Longitude .. .. .. -76 0 0 .. .. .... .. .. .. 26 15 38 ... .. .. 28 6 1 ... .. .. .... 26 50 46 -75 0 0 11 33 56.6 1 43 30 29 59 53 23 37 3 31 40 32 21 50 1 .... 30 26 2 -74 0 0 11 33 56.8 3 40 31 33 19 44 27 29 8 34 52 32 25 51 54 0.96 Latitude Latitude Latitude Latitude 31 0 0 -73 49 54 11 33 56.9 3 39 31 -74 42 37 -72 58 50 -75 11 53 -72 31 52 1.30 32 0 0 -73 31 37 11 33 57.0 3 38 31 -74 24 42 -72 40 12 -74 54 12 -72 13 4 1.28 33 0 0 -73 12 45 11 33 57.2 4 37 31 -74 6 13 -72 21 1 -74 35 55 -71 53 42 1.29 34 0 0 -72 53 18 11 33 57.4 4 36 32 -73 47 7 -72 1 15 -74 17 2 -71 33 46 1.31 35 0 0 -72 33 16 11 33 57.6 4 35 32 -73 27 26 -71 40 54 -73 57 32 -71 13 16 1.32 36 0 0 -72 12 38 11 33 57.8 5 34 32 -73 7 7 -71 19 58 -73 37 25 -70 52 11 1.33 37 0 0 -71 51 23 11 33 58.1 5 33 32 -72 46 11 -70 58 26 -73 16 40 -70 30 31 1.33 38 0 0 -71 29 31 11 33 58.4 6 32 32 -72 24 37 -70 36 18 -72 55 17 -70 8 14 1.34 39 0 0 -71 7 2 11 33 58.8 6 31 32 -72 2 25 -70 13 33 -72 33 14 -69 45 22 1.35 40 0 0 -70 43 54 11 33 59.1 7 30 32 -71 39 33 -69 50 12 -72 10 32 -69 21 54 1.35 41 0 0 -70 20 9 11 33 59.6 7 29 33 -71 16 2 -69 26 14 -71 47 10 -68 57 49 1.36 42 0 0 -69 55 46 11 34 0.0 8 29 33 -70 51 52 -69 1 39 -71 23 7 -68 33 8 1.36 43 0 0 -69 30 44 11 34 0.5 8 28 33 -70 27 3 -68 36 26 -70 58 25 -68 7 50 1.36 44 0 0 -69 5 4 11 34 1.0 9 27 33 -70 1 33 -68 10 37 -70 33 1 -67 41 56 1.37 45 0 0 -68 38 46 11 34 1.6 10 26 33 -69 35 24 -67 44 11 -70 6 58 -67 15 26 1.37 46 0 0 -68 11 50 11 34 2.3 10 25 33 -69 8 35 -67 17 8 -69 40 13 -66 48 20 1.37 47 0 0 -67 44 17 11 34 3.0 11 24 33 -68 41 8 -66 49 29 -69 12 49 -66 20 38 1.38 48 0 0 -67 16 5 11 34 3.7 11 23 33 -68 13 1 -66 21 14 -68 44 45 -65 52 21 1.38 49 0 0 -66 47 18 11 34 4.5 12 22 33 -67 44 16 -65 52 23 -68 16 2 -65 23 29 1.38 50 0 0 -66 17 54 11 34 5.4 12 21 33 -67 14 53 -65 22 58 -67 46 40 -64 54 3 1.38 51 0 0 -65 47 54 11 34 6.3 13 20 33 -66 44 53 -64 52 59 -67 16 39 -64 24 4 1.38 52 0 0 -65 17 20 11 34 7.3 14 19 33 -66 14 17 -64 22 26 -66 46 2 -63 53 32 1.39 53 0 0 -64 46 12 11 34 8.3 14 18 33 -65 43 6 -63 51 22 -66 14 48 -63 22 29 1.39 54 0 0 -64 14 31 11 34 9.4 15 17 33 -65 11 20 -63 19 46 -65 43 0 -62 50 55 1.39 55 0 0 -63 42 19 11 34 10.6 16 16 33 -64 39 1 -62 47 39 -65 10 37 -62 18 52 1.39 56 0 0 -63 9 37 11 34 11.9 16 15 33 -64 6 10 -62 15 4 -64 37 41 -61 46 21 1.39 57 0 0 -62 36 25 11 34 13.2 17 14 33 -63 32 49 -61 42 1 -64 4 14 -61 13 22 1.39 58 0 0 -62 2 46 11 34 14.6 18 13 33 -62 58 59 -61 8 32 -63 30 17 -60 39 58 1.39 59 0 0 -61 28 41 11 34 16.1 18 12 33 -62 24 41 -60 34 38 -62 55 52 -60 6 9 1.40 60 0 0 -60 54 11 11 34 17.6 19 11 33 -61 49 58 -60 0 21 -62 21 1 -59 31 58 1.40 61 0 0 -60 19 19 11 34 19.3 20 10 33 -61 14 50 -59 25 42 -61 45 44 -58 57 26 1.40 62 0 0 -59 44 5 11 34 21.0 20 9 32 -60 39 20 -58 50 43 -61 10 5 -58 22 34 1.40 63 0 0 -59 8 32 11 34 22.7 21 8 32 -60 3 30 -58 15 25 -60 34 5 -57 47 24 1.40 64 0 0 -58 32 41 11 34 24.6 22 7 32 -59 27 21 -57 39 51 -59 57 45 -57 11 58 1.40 65 0 0 -57 56 35 11 34 26.5 22 6 32 -58 50 56 -57 4 2 -59 21 8 -56 36 18 1.40 66 0 0 -57 20 15 11 34 28.5 23 5 31 -58 14 15 -56 28 0 -58 44 16 -56 0 25 1.40 67 0 0 -56 43 42 11 34 30.6 23 4 31 -57 37 22 -55 51 46 -58 7 11 -55 24 21 1.40 68 0 0 -56 7 0 11 34 32.8 24 3 31 -57 0 19 -55 15 24 -57 29 54 -54 48 8 1.41 69 0 0 -55 30 10 11 34 35.0 25 2 30 -56 23 6 -54 38 54 -56 52 29 -54 11 48 1.41 70 0 0 -54 53 14 11 34 37.3 25 1 30 -55 45 47 -54 2 18 -56 14 57 -53 35 23 1.41 71 0 0 -54 16 13 11 34 39.7 26 359 30 -55 8 23 -53 25 38 -55 37 19 -52 58 54 1.41 72 0 0 -53 39 10 11 34 42.2 27 358 29 -54 30 57 -52 48 57 -54 59 39 -52 22 24 1.41 73 0 0 -53 2 7 11 34 44.7 27 357 29 -53 53 30 -52 12 16 -54 21 58 -51 45 53 1.41 74 0 0 -52 25 6 11 34 47.3 28 356 28 -53 16 4 -51 35 37 -53 44 19 -51 9 25 1.41 75 0 0 -51 48 8 11 34 50.0 28 355 28 -52 38 42 -50 59 1 -53 6 42 -50 33 1 1.41 76 0 0 -51 11 15 11 34 52.7 29 354 27 -52 1 25 -50 22 31 -52 29 11 -49 56 42 1.41 77 0 0 -50 34 30 11 34 55.5 29 353 27 -51 24 15 -49 46 8 -51 51 46 -49 20 30 1.41 78 0 0 -49 57 53 11 34 58.4 30 351 26 -50 47 14 -49 9 54 -51 14 31 -48 44 28 1.42 79 0 0 -49 21 27 11 35 1.3 30 350 26 -50 10 23 -48 33 50 -50 37 26 -48 8 36 1.42 80 0 0 -48 45 14 11 35 4.2 31 349 25 -49 33 45 -47 57 59 -50 0 34 -47 32 57 1.42 81 0 0 -48 9 14 11 35 7.2 31 348 24 -48 57 21 -47 22 22 -49 23 55 -46 57 31 1.42 82 0 0 -47 33 30 11 35 10.3 32 346 24 -48 21 13 -46 47 1 -48 47 33 -46 22 21 1.42 83 0 0 -46 58 3 11 35 13.4 32 345 23 -47 45 22 -46 11 56 -48 11 28 -45 47 28 1.42 84 0 0 -46 22 55 11 35 16.6 33 344 22 -47 9 50 -45 37 10 -47 35 43 -45 12 53 1.42 85 0 0 -45 48 7 11 35 19.8 33 343 22 -46 34 38 -45 2 44 -47 0 17 -44 38 38 1.42 86 0 0 -45 13 41 11 35 23.0 33 341 21 -45 59 48 -44 28 39 -46 25 14 -44 4 45 1.42 87 0 0 -44 39 37 11 35 26.3 34 340 20 -45 25 21 -43 54 57 -45 50 34 -43 31 13 1.42 88 0 0 -44 5 57 11 35 29.6 34 339 19 -44 51 19 -43 21 39 -45 16 19 -42 58 6 1.43 89 0 0 -43 32 43 11 35 32.9 34 337 19 -44 17 43 -42 48 45 -44 42 30 -42 25 23 1.43 90 0 0 -42 59 56 11 35 36.2 34 336 18 -43 44 33 -42 16 18 -44 9 8 -41 53 6 1.43 91 0 0 -42 27 36 11 35 39.6 34 335 17 -43 11 52 -41 44 18 -43 36 14 -41 21 17 1.43 92 0 0 -41 55 45 11 35 43.0 35 334 16 -42 39 39 -41 12 47 -43 3 50 -40 49 56 1.43 93 0 0 -41 24 23 11 35 46.3 35 332 15 -42 7 57 -40 41 45 -42 31 56 -40 19 4 1.43 94 0 0 -40 53 33 11 35 49.7 35 331 14 -41 36 47 -40 11 14 -42 0 33 -39 48 43 1.43 95 0 0 -40 23 14 11 35 53.2 35 330 14 -41 6 8 -39 41 14 -41 29 43 -39 18 52 1.43 96 0 0 -39 53 28 11 35 56.6 35 328 13 -40 36 2 -39 11 46 -40 59 27 -38 49 33 1.43 97 0 0 -39 24 15 11 36 0.0 35 327 12 -40 6 30 -38 42 51 -40 29 44 -38 20 48 1.43 98 0 0 -38 55 36 11 36 3.4 35 326 11 -39 37 33 -38 14 30 -40 0 36 -37 52 35 1.43 99 0 0 -38 27 33 11 36 6.8 35 325 10 -39 9 11 -37 46 43 -39 32 4 -37 24 58 1.44 100 0 0 -38 0 5 11 36 10.2 35 323 9 -38 41 26 -37 19 31 -39 4 9 -36 57 55 1.44 101 0 0 -37 33 13 11 36 13.6 35 322 8 -38 14 17 -36 52 56 -38 36 50 -36 31 27 1.44 102 0 0 -37 6 58 11 36 16.9 34 321 8 -37 47 45 -36 26 57 -38 10 9 -36 5 36 1.44 103 0 0 -36 41 20 11 36 20.3 34 320 7 -37 21 52 -36 1 34 -37 44 6 -35 40 22 1.44 104 0 0 -36 16 21 11 36 23.6 34 318 6 -36 56 37 -35 36 50 -37 18 42 -35 15 45 1.44 105 0 0 -35 52 0 11 36 26.9 34 317 5 -36 32 0 -35 12 43 -36 53 58 -34 51 46 1.44 106 0 0 -35 28 18 11 36 30.2 33 316 4 -36 8 4 -34 49 15 -36 29 52 -34 28 26 1.44 107 0 0 -35 5 16 11 36 33.4 33 315 3 -35 44 47 -34 26 26 -36 6 28 -34 5 44 1.44 108 0 0 -34 42 53 11 36 36.6 33 314 2 -35 22 10 -34 4 17 -35 43 43 -33 43 41 1.44 109 0 0 -34 21 10 11 36 39.8 32 313 1 -35 0 14 -33 42 47 -35 21 40 -33 22 17 1.44 110 0 0 -34 0 8 11 36 42.9 32 312 0 -34 38 59 -33 21 57 -35 0 18 -33 1 34 1.44 111 0 0 -33 39 47 11 36 46.0 32 310 -1 -34 18 26 -33 1 48 -34 39 37 -32 41 31 1.45 112 0 0 -33 20 7 11 36 49.1 31 309 -1 -33 58 34 -32 42 19 -34 19 38 -32 22 8 1.45 113 0 0 -33 1 8 11 36 52.1 31 308 -2 -33 39 24 -32 23 31 -34 0 22 -32 3 26 1.45 114 0 0 -32 42 51 11 36 55.1 30 307 -3 -33 20 56 -32 5 25 -33 41 47 -31 45 25 1.45 115 0 0 -32 25 16 11 36 58.0 30 306 -4 -33 3 10 -31 48 0 -33 23 56 -31 28 5 1.45 116 0 0 -32 8 23 11 37 0.9 29 305 -5 -32 46 7 -31 31 16 -33 6 47 -31 11 27 1.45 117 0 0 -31 52 12 11 37 3.7 29 305 -6 -32 29 46 -31 15 14 -32 50 21 -30 55 30 1.45 118 0 0 -31 36 44 11 37 6.5 28 304 -7 -32 14 8 -30 59 55 -32 34 38 -30 40 15 1.45 119 0 0 -31 21 58 11 37 9.2 28 303 -8 -31 59 14 -30 45 17 -32 19 38 -30 25 42 1.45 120 0 0 -31 7 55 11 37 11.8 27 302 -9 -31 45 2 -30 31 22 -32 5 22 -30 11 51 1.45 121 0 0 -30 54 34 11 37 14.4 26 301 -10 -31 31 34 -30 18 9 -31 51 49 -29 58 42 1.45 122 0 0 -30 41 57 11 37 17.0 26 300 -10 -31 18 49 -30 5 39 -31 39 0 -29 46 15 1.45 123 0 0 -30 30 2 11 37 19.4 25 299 -11 -31 6 47 -29 53 51 -31 26 54 -29 34 31 1.45 124 0 0 -30 18 51 11 37 21.8 24 299 -12 -30 55 29 -29 42 46 -31 15 32 -29 23 29 1.45 125 0 0 -30 8 23 11 37 24.2 24 298 -13 -30 44 55 -29 32 24 -31 4 55 -29 13 10 1.46 126 0 0 -29 58 38 11 37 26.5 23 297 -14 -30 35 4 -29 22 44 -30 55 0 -29 3 33 1.46 127 0 0 -29 49 36 11 37 28.7 22 296 -15 -30 25 57 -29 13 48 -30 45 50 -28 54 39 1.46 128 0 0 -29 41 17 11 37 30.8 22 296 -16 -30 17 33 -29 5 34 -30 37 24 -28 46 28 1.46 129 0 0 -29 33 42 11 37 32.9 21 295 -16 -30 9 53 -28 58 3 -30 29 42 -28 38 59 1.46 130 0 0 -29 26 50 11 37 34.9 20 294 -17 -30 2 57 -28 51 15 -30 22 43 -28 32 14 1.46 131 0 0 -29 20 42 11 37 36.8 19 294 -18 -29 56 45 -28 45 10 -30 16 29 -28 26 10 1.46 132 0 0 -29 15 16 11 37 38.6 18 293 -19 -29 51 16 -28 39 48 -30 10 58 -28 20 50 1.46 133 0 0 -29 10 34 11 37 40.4 18 292 -20 -29 46 32 -28 35 9 -30 6 12 -28 16 13 1.46 134 0 0 -29 6 36 11 37 42.1 17 292 -20 -29 42 31 -28 31 13 -30 2 10 -28 12 18 1.46 135 0 0 -29 3 21 11 37 43.7 16 291 -21 -29 39 13 -28 28 0 -29 58 51 -28 9 6 1.47 136 0 0 -29 0 49 11 37 45.3 15 291 -22 -29 36 40 -28 25 29 -29 56 17 -28 6 36 1.47 137 0 0 -28 59 0 11 37 46.7 14 290 -23 -29 34 50 -28 23 42 -29 54 26 -28 4 49 1.47 138 0 0 -28 57 55 11 37 48.1 14 290 -23 -29 33 43 -28 22 38 -29 53 19 -28 3 45 1.47 139 0 0 -28 57 33 11 37 49.4 13 289 -24 -29 33 21 -28 22 16 -29 52 56 -28 3 24 1.47 140 0 0 -28 57 54 11 37 50.7 12 288 -25 -29 33 42 -28 22 37 -29 53 17 -28 3 45 1.48 141 0 0 -28 58 58 11 37 51.8 11 288 -25 -29 34 46 -28 23 41 -29 54 21 -28 4 49 1.48 142 0 0 -29 0 45 11 37 52.9 10 287 -26 -29 36 34 -28 25 27 -29 56 10 -28 6 35 1.48 143 0 0 -29 3 15 11 37 53.8 9 287 -27 -29 39 5 -28 27 56 -29 58 42 -28 9 3 1.49 144 0 0 -29 6 28 11 37 54.7 9 286 -27 -29 42 20 -28 31 8 -30 1 57 -28 12 14 1.49 145 0 0 -29 10 24 11 37 55.5 8 286 -28 -29 46 18 -28 35 2 -30 5 56 -28 16 8 1.50 146 0 0 -29 15 3 11 37 56.3 7 285 -29 -29 50 59 -28 39 39 -30 10 38 -28 20 43 1.51 147 0 0 -29 20 25 11 37 56.9 6 285 -29 -29 56 23 -28 44 58 -30 16 4 -28 26 1 1.52 148 0 0 -29 26 29 11 37 57.5 5 284 -30 -30 2 30 -28 50 59 -30 22 13 -28 32 1 1.53 149 0 0 -29 33 16 11 37 57.9 4 284 -30 -30 9 21 -28 57 43 -30 29 5 -28 38 42 1.55 150 0 0 -29 40 45 11 37 58.3 3 283 -31 -30 16 54 -29 5 8 -30 36 41 -28 46 6 1.59 151 0 0 -29 48 56 11 37 58.6 3 283 -31 -30 25 10 -29 13 16 -30 44 59 -28 54 11 1.64 152 0 0 -29 57 50 11 37 58.8 2 282 -32 -30 34 8 -29 22 5 -30 54 0 .. .. .. 1.75 153 0 0 -30 7 26 11 37 58.9 1 282 -32 -30 43 49 -29 31 37 -31 3 44 .. .. .. 2.12 Uncertainty in time = +/- 1 secs Prediction of 2020 Dec 31.0 Data for the target star ------------------------ * name: HIP 5837 * constellation : Pisces * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 01 14 51.1607 DE: +09 44 27.451 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 01 14 51.1601 DE: +09 44 27.447 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 7.9 * B mag [mag]: 8.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (331) Etheridgea asteroid class: approx. diameter [km]: 75 approx. diameter ["]: 0.034 distance from Earth [AU]: 3.06750 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: Preston date of fit: 2020 Dec 12 source of used astrometry: MPC, FASTT, TMO number of used observations: 3084 number of rejected observations: 5 time covered by the observations: 1960 Mar 28 - 2020 Oct 20 1 sigma uncertainty ellipse (major, minor, PA): 0.019", 0.009", 60.7° remarks: * orbital elements for (331)Etheridgea : Mean anomaly = 37.01442374 deg Arg. of pericenter = 333.51336174 deg Long. of node = 21.86178982 deg Inclination = 6.03682416 deg Eccentricity = 0.09603974 Semimajor axis = 3.02469008 AU Perihelion dist = 2.73419964 AU Mag: H = 9.70, G = 0.15 Epoch of elements : MJD 59249.48300000 TDT (2021 Feb 04.4830) ------ occelmnt file for Occult BEGIN ----------------------------------- Preston2020Dec12,2.5,2021,2,4,11.5993,0.33947,-0.74479,15.44312,7.00648,0.00498,0.00210,0.00000,0.00000 70.1404,9.8499,9.49,-16.08,False HIP 5837,1.24754450,9.7409578,8.60,7.90,7.52,0.0,0,,1.26557143,9.8499286 331,Etheridgea,15.33,75.0,3.0675,0,0,2.996,20.08,,4.8 0,36.9239,2021,2,4,333.5134,21.8618,6.0368,0.09604,3.02469,2.73420,9.70,5.0,0.15 1.270,0.0190,0.0090,61,0.0091,Known errors 20210204_P_5837,59214.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2020 Dec 31, 01:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org