IOTA/IOTA-ES occultation update for (19661) 1999 RR130 / HIP 36581 event on 2024 Dec 09, 08:26 UT Visible from Summary ------- On 2024 Dec 09 UT, the 14.4337581146966 km diameter asteroid (19661) 1999 RR130 will occult a 8.8 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 9.10 mag to 17.90 mag (the magnitude of the asteroid) for at most 1.760 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: 97 * date and approx. time of event: 2024 Dec 09, 08:17 - 2024 Dec 09, 08:34 * geocentric midpoint of event [JD]: 2460653.85155933 * magnitude of target star: 8.80 * magnitude drop [mag]: 9.10 * estimated maximum duration [s]: 1.760 * Moon: 58 % sunlit, 113° distance * Sun: 147° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 22 * 1 sigma uncertainty interval [path widths]: +/- 0.39 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.003", 105°) * approx speed of asteroid's shadow [km/s]: 8.2782 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 36581 by 19661 1999 RR130 on 2024 Dec 9 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 -162 0 0 .. .. .... .. .. .. .. .. .. -35 48 37 .. .. .. -35 42 41 .. .. .. .... -161 0 0 -35 22 19 8 34 38.0 1 55 -25 -35 14 52 -35 29 48 -35 8 59 -35 35 43 .... -160 0 0 -34 49 3 8 34 37.5 2 54 -26 -34 41 39 -34 56 28 -34 35 49 -35 2 21 0.75 -159 0 0 -34 16 20 8 34 36.7 3 54 -27 -34 8 59 -34 23 42 -34 3 12 -34 29 32 0.90 -158 0 0 -33 44 10 8 34 35.5 4 53 -28 -33 36 53 -33 51 29 -33 31 7 -33 57 17 0.98 -157 0 0 -33 12 34 8 34 34.0 5 52 -29 -33 5 20 -33 19 50 -32 59 37 -33 25 36 1.02 -156 0 0 -32 41 34 8 34 32.2 6 52 -29 -32 34 22 -32 48 46 -32 28 42 -32 54 29 1.05 -155 0 0 -32 11 9 8 34 30.0 7 51 -30 -32 4 0 -32 18 18 -31 58 22 -32 23 59 1.07 -154 0 0 -31 41 19 8 34 27.5 8 51 -31 -31 34 14 -31 48 26 -31 28 38 -31 54 4 1.09 -153 0 0 -31 12 7 8 34 24.6 9 50 -32 -31 5 4 -31 19 11 -30 59 31 -31 24 47 1.10 -152 0 0 -30 43 31 8 34 21.5 10 50 -33 -30 36 31 -30 50 32 -30 31 0 -30 56 6 1.11 -151 0 0 -30 15 33 8 34 18.0 11 49 -33 -30 8 36 -30 22 31 -30 3 7 -30 28 3 1.12 -150 0 0 -29 48 13 8 34 14.2 12 49 -34 -29 41 18 -29 55 8 -29 35 51 -30 0 38 1.12 -149 0 0 -29 21 31 8 34 10.1 13 48 -35 -29 14 39 -29 28 24 -29 9 14 -29 33 51 1.13 -148 0 0 -28 55 27 8 34 5.6 13 48 -36 -28 48 38 -29 2 18 -28 43 15 -29 7 43 1.13 -147 0 0 -28 30 3 8 34 0.9 14 47 -36 -28 23 16 -28 36 51 -28 17 55 -28 42 14 1.13 -146 0 0 -28 5 17 8 33 55.9 15 47 -37 -27 58 32 -28 12 3 -27 53 13 -28 17 24 1.14 -145 0 0 -27 41 11 8 33 50.7 16 46 -38 -27 34 28 -27 47 54 -27 29 11 -27 53 14 1.14 -144 0 0 -27 17 44 8 33 45.1 17 45 -38 -27 11 4 -27 24 25 -27 5 48 -27 29 43 1.14 -143 0 0 -26 54 56 8 33 39.2 18 45 -39 -26 48 18 -27 1 35 -26 43 4 -27 6 51 1.14 -142 0 0 -26 32 49 8 33 33.1 19 44 -39 -26 26 13 -26 39 26 -26 21 1 -26 44 40 1.15 -141 0 0 -26 11 21 8 33 26.8 20 44 -40 -26 4 47 -26 17 56 -25 59 37 -26 23 9 1.15 -140 0 0 -25 50 34 8 33 20.1 21 43 -40 -25 44 2 -25 57 6 -25 38 53 -26 2 18 1.15 -139 0 0 -25 30 26 8 33 13.3 21 43 -41 -25 23 56 -25 36 57 -25 18 48 -25 42 7 1.15 -138 0 0 -25 10 59 8 33 6.2 22 42 -41 -25 4 31 -25 17 28 -24 59 24 -25 22 36 1.15 -137 0 0 -24 52 11 8 32 58.8 23 41 -42 -24 45 45 -24 58 39 -24 40 40 -25 3 46 1.15 -136 0 0 -24 34 4 8 32 51.2 24 41 -42 -24 27 40 -24 40 30 -24 22 36 -24 45 36 1.15 -135 0 0 -24 16 38 8 32 43.4 25 40 -43 -24 10 15 -24 23 2 -24 5 12 -24 28 6 1.15 -134 0 0 -23 59 51 8 32 35.4 25 40 -43 -23 53 30 -24 6 14 -23 48 28 -24 11 17 1.15 -133 0 0 -23 43 45 8 32 27.1 26 39 -43 -23 37 25 -23 50 6 -23 32 25 -23 55 8 1.15 -132 0 0 -23 28 19 8 32 18.7 27 38 -44 -23 22 0 -23 34 38 -23 17 2 -23 39 39 1.15 -131 0 0 -23 13 33 8 32 10.0 28 38 -44 -23 7 16 -23 19 51 -23 2 18 -23 24 51 1.15 -130 0 0 -22 59 28 8 32 1.2 28 37 -44 -22 53 12 -23 5 45 -22 48 15 -23 10 43 1.15 -129 0 0 -22 46 3 8 31 52.2 29 36 -44 -22 39 48 -22 52 18 -22 34 52 -22 57 16 1.15 -128 0 0 -22 33 18 8 31 43.0 30 36 -45 -22 27 4 -22 39 32 -22 22 9 -22 44 29 1.15 -127 0 0 -22 21 13 8 31 33.6 30 35 -45 -22 15 1 -22 27 26 -22 10 7 -22 32 22 1.15 -126 0 0 -22 9 48 8 31 24.0 31 34 -45 -22 3 37 -22 16 0 -21 58 44 -22 20 55 1.15 -125 0 0 -21 59 4 8 31 14.3 32 33 -45 -21 52 53 -22 5 15 -21 48 1 -22 10 9 1.15 -124 0 0 -21 48 59 8 31 4.4 32 33 -45 -21 42 49 -21 55 9 -21 37 58 -22 0 3 1.15 -123 0 0 -21 39 34 8 30 54.4 33 32 -45 -21 33 26 -21 45 43 -21 28 35 -21 50 36 1.15 -122 0 0 -21 30 49 8 30 44.2 34 31 -45 -21 24 42 -21 36 58 -21 19 51 -21 41 50 1.15 -121 0 0 -21 22 44 8 30 33.9 34 30 -45 -21 16 37 -21 28 52 -21 11 48 -21 33 44 1.15 -120 0 0 -21 15 19 8 30 23.5 35 29 -45 -21 9 13 -21 21 26 -21 4 24 -21 26 17 1.15 -119 0 0 -21 8 34 8 30 12.9 35 29 -45 -21 2 28 -21 14 40 -20 57 40 -21 19 31 1.15 -118 0 0 -21 2 28 8 30 2.2 36 28 -45 -20 56 23 -21 8 34 -20 51 35 -21 13 24 1.15 -117 0 0 -20 57 2 8 29 51.4 36 27 -45 -20 50 58 -21 3 8 -20 46 10 -21 7 57 1.15 -116 0 0 -20 52 16 8 29 40.5 37 26 -44 -20 46 12 -20 58 21 -20 41 24 -21 3 10 1.15 -115 0 0 -20 48 9 8 29 29.4 37 25 -44 -20 42 6 -20 54 14 -20 37 18 -20 59 3 1.15 -114 0 0 -20 44 42 8 29 18.3 38 24 -44 -20 38 39 -20 50 46 -20 33 52 -20 55 35 1.15 -113 0 0 -20 41 54 8 29 7.0 38 23 -44 -20 35 51 -20 47 58 -20 31 4 -20 52 47 1.15 -112 0 0 -20 39 46 8 28 55.7 38 22 -43 -20 33 43 -20 45 50 -20 28 57 -20 50 38 1.15 -111 0 0 -20 38 17 8 28 44.3 39 21 -43 -20 32 14 -20 44 21 -20 27 28 -20 49 9 1.15 -110 0 0 -20 37 28 8 28 32.8 39 20 -43 -20 31 25 -20 43 31 -20 26 39 -20 48 19 1.15 -109 0 0 -20 37 17 8 28 21.3 39 19 -42 -20 31 15 -20 43 21 -20 26 28 -20 48 9 1.15 -108 0 0 -20 37 46 8 28 9.6 40 18 -42 -20 31 44 -20 43 50 -20 26 57 -20 48 38 1.15 -107 0 0 -20 38 55 8 27 57.9 40 17 -42 -20 32 52 -20 44 58 -20 28 6 -20 49 46 1.15 -106 0 0 -20 40 42 8 27 46.2 40 16 -41 -20 34 39 -20 46 45 -20 29 53 -20 51 34 1.15 -105 0 0 -20 43 9 8 27 34.4 40 15 -41 -20 37 6 -20 49 12 -20 32 19 -20 54 0 1.15 -104 0 0 -20 46 14 8 27 22.5 40 14 -40 -20 40 11 -20 52 18 -20 35 24 -20 57 7 1.15 -103 0 0 -20 49 59 8 27 10.6 41 13 -40 -20 43 56 -20 56 3 -20 39 9 -21 0 52 1.15 -102 0 0 -20 54 23 8 26 58.7 41 12 -39 -20 48 19 -21 0 28 -20 43 32 -21 5 17 1.15 -101 0 0 -20 59 26 8 26 46.8 41 11 -39 -20 53 22 -21 5 31 -20 48 35 -21 10 20 1.15 -100 0 0 -21 5 8 8 26 34.8 41 9 -38 -20 59 4 -21 11 14 -20 54 16 -21 16 3 1.15 - 99 0 0 -21 11 29 8 26 22.8 41 8 -37 -21 5 24 -21 17 35 -21 0 36 -21 22 25 1.16 - 98 0 0 -21 18 30 8 26 10.8 41 7 -37 -21 12 24 -21 24 36 -21 7 35 -21 29 26 1.16 - 97 0 0 -21 26 9 8 25 58.8 41 6 -36 -21 20 2 -21 32 16 -21 15 13 -21 37 7 1.16 - 96 0 0 -21 34 27 8 25 46.7 41 5 -36 -21 28 20 -21 40 35 -21 23 30 -21 45 26 1.16 - 95 0 0 -21 43 24 8 25 34.7 41 4 -35 -21 37 16 -21 49 32 -21 32 26 -21 54 24 1.16 - 94 0 0 -21 53 0 8 25 22.7 41 3 -34 -21 46 51 -21 59 9 -21 42 0 -22 4 2 1.16 - 93 0 0 -22 3 15 8 25 10.7 40 2 -34 -21 57 5 -22 9 25 -21 52 14 -22 14 18 1.16 - 92 0 0 -22 14 8 8 24 58.8 40 0 -33 -22 7 58 -22 20 19 -22 3 6 -22 25 13 1.16 - 91 0 0 -22 25 41 8 24 46.8 40 359 -32 -22 19 30 -22 31 53 -22 14 37 -22 36 48 1.16 - 90 0 0 -22 37 52 8 24 34.9 40 358 -31 -22 31 40 -22 44 5 -22 26 46 -22 49 1 1.16 - 89 0 0 -22 50 43 8 24 23.1 40 357 -31 -22 44 29 -22 56 57 -22 39 34 -23 1 53 1.16 - 88 0 0 -23 4 12 8 24 11.2 39 356 -30 -22 57 57 -23 10 27 -22 53 1 -23 15 24 1.16 - 87 0 0 -23 18 19 8 23 59.5 39 355 -29 -23 12 4 -23 24 36 -23 7 7 -23 29 34 1.16 - 86 0 0 -23 33 6 8 23 47.8 39 354 -28 -23 26 49 -23 39 23 -23 21 51 -23 44 23 1.16 - 85 0 0 -23 48 31 8 23 36.1 38 353 -28 -23 42 12 -23 54 50 -23 37 14 -23 59 50 1.17 - 84 0 0 -24 4 34 8 23 24.6 38 352 -27 -23 58 15 -24 10 55 -23 53 15 -24 15 56 1.17 - 83 0 0 -24 21 17 8 23 13.1 38 351 -26 -24 14 56 -24 27 39 -24 9 55 -24 32 41 1.17 - 82 0 0 -24 38 37 8 23 1.7 37 350 -25 -24 32 15 -24 45 1 -24 27 13 -24 50 5 1.17 - 81 0 0 -24 56 36 8 22 50.4 37 349 -24 -24 50 12 -25 3 1 -24 45 9 -25 8 7 1.17 - 80 0 0 -25 15 14 8 22 39.2 36 348 -23 -25 8 48 -25 21 40 -25 3 43 -25 26 47 1.17 - 79 0 0 -25 34 29 8 22 28.1 36 347 -23 -25 28 2 -25 40 58 -25 22 56 -25 46 6 1.17 - 78 0 0 -25 54 23 8 22 17.1 35 346 -22 -25 47 54 -26 0 53 -25 42 46 -26 6 2 1.17 - 77 0 0 -26 14 55 8 22 6.2 35 345 -21 -26 8 24 -26 21 27 -26 3 15 -26 26 37 1.18 - 76 0 0 -26 36 4 8 21 55.5 34 344 -20 -26 29 31 -26 42 38 -26 24 21 -26 47 50 1.18 - 75 0 0 -26 57 51 8 21 44.9 34 343 -19 -26 51 16 -27 4 27 -26 46 5 -27 9 41 1.18 - 74 0 0 -27 20 16 8 21 34.4 33 342 -18 -27 13 39 -27 26 54 -27 8 26 -27 32 10 1.18 - 73 0 0 -27 43 18 8 21 24.1 32 341 -17 -27 36 39 -27 49 58 -27 31 24 -27 55 15 1.18 - 72 0 0 -28 6 58 8 21 14.0 32 341 -16 -28 0 17 -28 13 40 -27 55 0 -28 18 59 1.18 - 71 0 0 -28 31 13 8 21 4.0 31 340 -15 -28 24 30 -28 37 58 -28 19 12 -28 43 18 1.18 - 70 0 0 -28 56 6 8 20 54.2 30 339 -15 -28 49 20 -29 2 53 -28 44 0 -29 8 15 1.18 - 69 0 0 -29 21 36 8 20 44.5 30 338 -14 -29 14 48 -29 28 25 -29 9 26 -29 33 49 1.19 - 68 0 0 -29 47 41 8 20 35.1 29 337 -13 -29 40 51 -29 54 33 -29 35 27 -29 59 59 1.19 - 67 0 0 -30 14 23 8 20 25.9 28 336 -12 -30 7 30 -30 21 17 -30 2 4 -30 26 45 1.19 - 66 0 0 -30 41 40 8 20 16.8 27 336 -11 -30 34 44 -30 48 36 -30 29 16 -30 54 6 1.19 - 65 0 0 -31 9 31 8 20 8.0 27 335 -10 -31 2 33 -31 16 31 -30 57 4 -31 22 3 1.19 - 64 0 0 -31 37 58 8 19 59.4 26 334 -9 -31 30 57 -31 45 0 -31 25 25 -31 50 34 1.19 - 63 0 0 -32 6 59 8 19 51.0 25 333 -8 -31 59 56 -32 14 4 -31 54 21 -32 19 40 1.19 - 62 0 0 -32 36 34 8 19 42.8 24 333 -7 -32 29 27 -32 43 41 -32 23 51 -32 49 20 1.20 - 61 0 0 -33 6 41 8 19 34.9 23 332 -6 -32 59 32 -33 13 52 -32 53 54 -33 19 33 1.20 - 60 0 0 -33 37 22 8 19 27.3 23 331 -5 -33 30 10 -33 44 35 -33 24 29 -33 50 19 1.20 - 59 0 0 -34 8 34 8 19 19.9 22 330 -4 -34 1 19 -34 15 50 -33 55 36 -34 21 36 1.20 - 58 0 0 -34 40 18 8 19 12.7 21 330 -3 -34 33 0 -34 47 37 -34 27 15 -34 53 26 1.20 - 57 0 0 -35 12 33 8 19 5.9 20 329 -2 -35 5 12 -35 19 55 -34 59 24 -35 25 46 1.20 - 56 0 0 -35 45 17 8 18 59.3 19 328 -1 -35 37 53 -35 52 43 -35 32 3 -35 58 36 1.21 - 55 0 0 -36 18 31 8 18 52.9 18 328 0 -36 11 4 -36 26 0 -36 5 11 -36 31 56 1.21 - 54 0 0 -36 52 13 8 18 46.9 17 327 1 -36 44 43 -36 59 45 -36 38 47 -37 5 44 1.21 - 53 0 0 -37 26 23 8 18 41.2 16 326 2 -37 18 49 -37 33 58 -37 12 51 -37 40 0 1.21 - 52 0 0 -38 0 59 8 18 35.8 16 325 3 -37 53 22 -38 8 38 -37 47 22 -38 14 42 1.21 - 51 0 0 -38 36 1 8 18 30.6 15 325 3 -38 28 20 -38 43 43 -38 22 17 -38 49 49 1.21 - 50 0 0 -39 11 27 8 18 25.8 14 324 4 -39 3 43 -39 19 12 -38 57 37 -39 25 22 1.22 - 49 0 0 -39 47 16 8 18 21.3 13 323 5 -39 39 29 -39 55 5 -39 33 20 -40 1 17 1.22 - 48 0 0 -40 23 27 8 18 17.1 12 323 6 -40 15 37 -40 31 20 -40 9 26 -40 37 35 1.22 - 47 0 0 -41 0 0 8 18 13.2 11 322 7 -40 52 6 -41 7 56 -40 45 52 -41 14 13 1.22 - 46 0 0 -41 36 52 8 18 9.7 10 321 8 -41 28 54 -41 44 51 -41 22 37 -41 51 11 1.23 - 45 0 0 -42 14 2 8 18 6.5 9 321 9 -42 6 0 -42 22 4 -41 59 41 -42 28 28 1.23 - 44 0 0 -42 51 28 8 18 3.6 8 320 10 -42 43 24 -42 59 35 -42 37 2 -43 6 1 1.23 - 43 0 0 -43 29 10 8 18 1.0 7 319 11 -43 21 2 -43 37 20 -43 14 38 -43 43 49 1.24 - 42 0 0 -44 7 6 8 17 58.8 6 319 12 -43 58 55 -44 15 19 -43 52 27 -44 21 51 1.24 - 41 0 0 -44 45 14 8 17 56.9 5 318 13 -44 36 59 -44 53 31 -44 30 29 -45 0 5 1.25 - 40 0 0 -45 23 32 8 17 55.3 4 317 14 -45 15 14 -45 31 52 -45 8 41 -45 38 29 1.26 - 39 0 0 -46 1 59 8 17 54.1 3 316 14 -45 53 38 -46 10 23 -45 47 2 -46 17 2 1.28 - 38 0 0 -46 40 33 8 17 53.1 2 316 15 -46 32 8 -46 49 0 -46 25 30 -46 55 42 1.31 - 37 0 0 -47 19 12 8 17 52.5 1 315 16 -47 10 44 -47 27 42 -47 4 4 -47 34 27 1.38 - 36 0 0 -47 57 55 8 17 52.3 1 314 17 -47 49 23 -48 6 28 -47 42 40 -48 13 15 1.70 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: HIP 36581 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 31 25.4094 DE: +27 37 20.996 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 31 25.4094 DE: +27 37 20.996 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 8.8 * B mag [mag]: 8.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (19661) 1999 RR130 asteroid class: approx. diameter [km]: 14 approx. diameter ["]: 0.010 distance from Earth [AU]: 1.98880 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 date of fit: 2023 Apr 27 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): 0.022", 0.003", 104.888° remarks: * orbital elements for (19661)1999 RR130 : Mean anomaly = 268.6905376484 deg Arg. of pericenter = 251.2737685752 deg Long. of node = 317.0136337795 deg Inclination = 6.5541808130 deg Eccentricity = 0.1576190718 Semimajor axis = 2.7858851119 AU Perihelion dist = 2.3467764863 AU Mag: H = 13.44, G = 0.15 Epoch of elements : MJD 60653.35156317 TDT (2024 Dec 09.3516) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr27,1.76,2024,12,9,8.437424,-0.104557,-0.748308,-4.627434,0.647001,-0.003236,0.000006,0.000001,0.000000 -91.8896,27.5693,51.56,-22.88,False HIP 36581,7.52372481,27.6224989,8.81,8.80,8.79,0.1,4,,7.54984092,27.5693476,9.10,8.66,0,0,0 19661,1999 RR130,17.90,14.578,1.9888,0,0,-1.539,2.86,,1.0,0 0,268.6160,2024,12,9,251.2738,317.0136,6.5542,0.15762,2.78589,2.34678,13.44,5.0,0.15 1.396,0.0223,0.0030,105,0.0040,Known errors,1.35,0,-1,-1 20241209__36581,60140.73 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:35 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org