IOTA/IOTA-ES occultation update for (797) Montana / TYC 822-00888-1 event on 2024 Nov 18, 03:27 UT Visible from Summary ------- On 2024 Nov 18 UT, the 21.972 km diameter asteroid (797) Montana will occult a 11.0 mag star in the constellation Cancer for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.50 mag to 15.44 mag (the magnitude of the asteroid) for at most 1.650 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: 99 * date and approx. time of event: 2024 Nov 18, 03:21 - 2024 Nov 18, 03:33 * geocentric midpoint of event [JD]: 2460632.64418141 * magnitude of target star: 10.96 * magnitude drop [mag]: 4.50 * estimated maximum duration [s]: 1.650 * Moon: 93 % sunlit, 53° distance * Sun: 97° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 28 * 1 sigma uncertainty interval [path widths]: +/- 0.29 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.003", 108°) * approx speed of asteroid's shadow [km/s]: 13.3087 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 822-00888-1 by 797 Montana on 2024 Nov 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 - 56 0 0 .. .. .... .. .. .. .. .. .. .. .. .. - 9 50 40 .. .. .. - 9 46 8 .... - 55 0 0 - 9 47 4 3 21 23.8 1 79 -61 - 9 54 49 - 9 39 19 - 9 59 22 - 9 34 47 .... - 54 0 0 - 9 36 22 3 21 24.1 2 79 -61 - 9 44 6 - 9 28 38 - 9 48 39 - 9 24 7 0.56 - 53 0 0 - 9 26 20 3 21 24.6 3 78 -61 - 9 34 4 - 9 18 37 - 9 38 36 - 9 14 6 0.64 - 52 0 0 - 9 16 59 3 21 25.3 4 78 -61 - 9 24 42 - 9 9 17 - 9 29 14 - 9 4 46 0.68 - 51 0 0 - 9 8 19 3 21 26.1 5 78 -61 - 9 16 1 - 9 0 37 - 9 20 33 - 8 56 7 0.71 - 50 0 0 - 9 0 19 3 21 27.1 6 78 -61 - 9 8 1 - 8 52 38 - 9 12 32 - 8 48 8 0.72 - 49 0 0 - 8 53 0 3 21 28.3 7 78 -61 - 9 0 41 - 8 45 19 - 9 5 12 - 8 40 50 0.73 - 48 0 0 - 8 46 22 3 21 29.7 8 78 -61 - 8 54 3 - 8 38 42 - 8 58 33 - 8 34 13 0.74 - 47 0 0 - 8 40 25 3 21 31.3 9 77 -61 - 8 48 5 - 8 32 45 - 8 52 36 - 8 28 16 0.75 - 46 0 0 - 8 35 9 3 21 33.1 10 77 -61 - 8 42 49 - 8 27 30 - 8 47 19 - 8 23 1 0.76 - 45 0 0 - 8 30 34 3 21 35.0 11 77 -61 - 8 38 14 - 8 22 55 - 8 42 44 - 8 18 27 0.76 - 44 0 0 - 8 26 41 3 21 37.2 12 77 -61 - 8 34 21 - 8 19 2 - 8 38 50 - 8 14 34 0.77 - 43 0 0 - 8 23 29 3 21 39.5 13 77 -60 - 8 31 8 - 8 15 50 - 8 35 38 - 8 11 22 0.77 - 42 0 0 - 8 20 58 3 21 42.0 14 76 -60 - 8 28 38 - 8 13 20 - 8 33 7 - 8 8 52 0.77 - 41 0 0 - 8 19 10 3 21 44.6 15 76 -60 - 8 26 49 - 8 11 31 - 8 31 18 - 8 7 3 0.78 - 40 0 0 - 8 18 2 3 21 47.5 16 76 -59 - 8 25 42 - 8 10 24 - 8 30 11 - 8 5 56 0.78 - 39 0 0 - 8 17 37 3 21 50.5 17 76 -59 - 8 25 17 - 8 9 58 - 8 29 46 - 8 5 30 0.78 - 38 0 0 - 8 17 54 3 21 53.7 18 76 -58 - 8 25 33 - 8 10 15 - 8 30 3 - 8 5 46 0.78 - 37 0 0 - 8 18 52 3 21 57.1 19 75 -58 - 8 26 32 - 8 11 13 - 8 31 2 - 8 6 45 0.78 - 36 0 0 - 8 20 33 3 22 0.7 20 75 -57 - 8 28 13 - 8 12 54 - 8 32 43 - 8 8 25 0.79 - 35 0 0 - 8 22 55 3 22 4.4 21 75 -56 - 8 30 36 - 8 15 16 - 8 35 6 - 8 10 47 0.79 - 34 0 0 - 8 26 1 3 22 8.3 22 75 -56 - 8 33 41 - 8 18 21 - 8 38 12 - 8 13 52 0.79 - 33 0 0 - 8 29 48 3 22 12.4 23 74 -55 - 8 37 29 - 8 22 8 - 8 42 0 - 8 17 38 0.79 - 32 0 0 - 8 34 18 3 22 16.6 24 74 -55 - 8 41 59 - 8 26 37 - 8 46 30 - 8 22 7 0.79 - 31 0 0 - 8 39 30 3 22 21.0 25 74 -54 - 8 47 12 - 8 31 49 - 8 51 43 - 8 27 19 0.79 - 30 0 0 - 8 45 25 3 22 25.6 25 73 -53 - 8 53 8 - 8 37 43 - 8 57 39 - 8 33 13 0.79 - 29 0 0 - 8 52 2 3 22 30.4 26 73 -52 - 8 59 46 - 8 44 20 - 9 4 18 - 8 39 49 0.80 - 28 0 0 - 8 59 23 3 22 35.3 27 73 -52 - 9 7 7 - 8 51 39 - 9 11 39 - 8 47 8 0.80 - 27 0 0 - 9 7 26 3 22 40.4 28 72 -51 - 9 15 11 - 8 59 41 - 9 19 44 - 8 55 10 0.80 - 26 0 0 - 9 16 12 3 22 45.6 29 72 -50 - 9 23 58 - 9 8 27 - 9 28 31 - 9 3 54 0.80 - 25 0 0 - 9 25 41 3 22 51.1 30 71 -49 - 9 33 28 - 9 17 55 - 9 38 2 - 9 13 22 0.80 - 24 0 0 - 9 35 53 3 22 56.6 31 71 -48 - 9 43 41 - 9 28 6 - 9 48 15 - 9 23 32 0.80 - 23 0 0 - 9 46 48 3 23 2.4 32 71 -48 - 9 54 37 - 9 39 0 - 9 59 12 - 9 34 26 0.80 - 22 0 0 - 9 58 26 3 23 8.3 33 70 -47 -10 6 16 - 9 50 37 -10 10 52 - 9 46 2 0.80 - 21 0 0 -10 10 48 3 23 14.3 34 69 -46 -10 18 39 -10 2 57 -10 23 16 - 9 58 22 0.80 - 20 0 0 -10 23 52 3 23 20.5 34 69 -45 -10 31 45 -10 16 0 -10 36 22 -10 11 24 0.80 - 19 0 0 -10 37 40 3 23 26.9 35 68 -44 -10 45 34 -10 29 47 -10 50 12 -10 25 10 0.80 - 18 0 0 -10 52 11 3 23 33.4 36 68 -43 -11 0 7 -10 44 17 -11 4 46 -10 39 39 0.80 - 17 0 0 -11 7 26 3 23 40.0 37 67 -42 -11 15 22 -10 59 30 -11 20 2 -10 54 51 0.80 - 16 0 0 -11 23 23 3 23 46.8 38 66 -41 -11 31 22 -11 15 26 -11 36 2 -11 10 47 0.81 - 15 0 0 -11 40 4 3 23 53.8 39 66 -40 -11 48 4 -11 32 5 -11 52 46 -11 27 25 0.81 - 14 0 0 -11 57 28 3 24 0.9 39 65 -39 -12 5 30 -11 49 28 -12 10 13 -11 44 47 0.81 - 13 0 0 -12 15 36 3 24 8.1 40 64 -38 -12 23 39 -12 7 33 -12 28 23 -12 2 51 0.81 - 12 0 0 -12 34 26 3 24 15.5 41 63 -37 -12 42 31 -12 26 22 -12 47 16 -12 21 39 0.81 - 11 0 0 -12 54 0 3 24 23.0 42 62 -36 -13 2 7 -12 45 54 -13 6 52 -12 41 10 0.81 - 10 0 0 -13 14 16 3 24 30.6 42 61 -35 -13 22 25 -13 6 8 -13 27 12 -13 1 23 0.81 - 9 0 0 -13 35 15 3 24 38.3 43 60 -34 -13 43 26 -13 27 5 -13 48 14 -13 22 19 0.81 - 8 0 0 -13 56 57 3 24 46.2 44 59 -33 -14 5 9 -13 48 45 -14 9 59 -13 43 57 0.81 - 7 0 0 -14 19 21 3 24 54.2 45 58 -32 -14 27 36 -14 11 7 -14 32 26 -14 6 18 0.81 - 6 0 0 -14 42 27 3 25 2.3 45 57 -31 -14 50 44 -14 34 11 -14 55 36 -14 29 21 0.81 - 5 0 0 -15 6 15 3 25 10.6 46 56 -30 -15 14 35 -14 57 57 -15 19 27 -14 53 6 0.81 - 4 0 0 -15 30 45 3 25 18.9 46 55 -29 -15 39 7 -15 22 25 -15 44 1 -15 17 33 0.81 - 3 0 0 -15 55 57 3 25 27.3 47 54 -28 -16 4 20 -15 47 34 -16 9 16 -15 42 41 0.81 - 2 0 0 -16 21 49 3 25 35.9 47 52 -27 -16 30 15 -16 13 25 -16 35 12 -16 8 29 0.81 - 1 0 0 -16 48 23 3 25 44.5 48 51 -26 -16 56 51 -16 39 55 -17 1 49 -16 34 59 0.81 0 0 0 -17 15 36 3 25 53.2 48 50 -25 -17 24 7 -17 7 7 -17 29 6 -17 2 9 0.81 1 0 0 -17 43 29 3 26 2.0 49 48 -24 -17 52 2 -17 34 57 -17 57 4 -17 29 58 0.81 2 0 0 -18 12 2 3 26 10.9 49 47 -22 -18 20 38 -18 3 28 -18 25 40 -17 58 27 0.81 3 0 0 -18 41 13 3 26 19.8 50 45 -21 -18 49 52 -18 32 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3 28 19.8 51 23 -7 -26 3 11 -25 44 45 -26 8 36 -25 39 23 0.80 17 0 0 -26 30 47 3 28 29.1 50 21 -6 -26 40 4 -26 21 32 -26 45 30 -26 16 8 0.80 18 0 0 -27 8 2 3 28 38.3 50 19 -5 -27 17 21 -26 58 44 -27 22 49 -26 53 18 0.80 19 0 0 -27 45 39 3 28 47.4 50 17 -4 -27 55 1 -27 36 19 -28 0 31 -27 30 51 0.80 20 0 0 -28 23 38 3 28 56.6 50 16 -3 -28 33 3 -28 14 15 -28 38 34 -28 8 46 0.80 21 0 0 -29 1 58 3 29 5.6 49 14 -2 -29 11 25 -28 52 32 -29 16 58 -28 47 1 0.80 22 0 0 -29 40 35 3 29 14.6 49 12 0 -29 50 5 -29 31 7 -29 55 40 -29 25 35 0.80 23 0 0 -30 19 30 3 29 23.5 48 10 1 -30 29 3 -30 9 59 -30 34 39 -30 4 26 0.80 24 0 0 -30 58 40 3 29 32.3 48 9 2 -31 8 15 -30 49 7 -31 13 53 -30 43 32 0.80 25 0 0 -31 38 5 3 29 41.0 47 7 3 -31 47 42 -31 28 29 -31 53 21 -31 22 52 0.80 26 0 0 -32 17 41 3 29 49.7 47 6 4 -32 27 20 -32 8 3 -32 33 1 -32 2 25 0.80 27 0 0 -32 57 27 3 29 58.2 46 4 5 -33 7 9 -32 47 47 -33 12 51 -32 42 7 0.80 28 0 0 -33 37 22 3 30 6.6 46 3 6 -33 47 6 -33 27 39 -33 52 50 -33 21 59 0.80 29 0 0 -34 17 24 3 30 14.8 45 1 7 -34 27 10 -34 7 39 -34 32 55 -34 1 57 0.80 30 0 0 -34 57 30 3 30 23.0 44 360 8 -35 7 19 -34 47 43 -35 13 5 -34 42 0 0.80 31 0 0 -35 37 40 3 30 31.0 44 358 9 -35 47 31 -35 27 51 -35 53 17 -35 22 7 0.80 32 0 0 -36 17 51 3 30 38.8 43 357 10 -36 27 44 -36 8 0 -36 33 31 -36 2 15 0.80 33 0 0 -36 58 1 3 30 46.6 42 356 11 -37 7 56 -36 48 9 -37 13 45 -36 42 22 0.80 34 0 0 -37 38 10 3 30 54.1 41 354 12 -37 48 6 -37 28 15 -37 53 56 -37 22 28 0.80 35 0 0 -38 18 13 3 31 1.5 41 353 13 -38 28 11 -38 8 18 -38 34 2 -38 2 29 0.80 36 0 0 -38 58 11 3 31 8.8 40 352 14 -39 8 11 -38 48 14 -39 14 2 -38 42 25 0.80 37 0 0 -39 38 2 3 31 15.8 39 351 15 -39 48 2 -39 28 3 -39 53 55 -39 22 13 0.80 38 0 0 -40 17 42 3 31 22.7 38 349 16 -40 27 44 -40 7 42 -40 33 37 -40 1 52 0.80 39 0 0 -40 57 12 3 31 29.5 37 348 17 -41 7 15 -40 47 11 -41 13 9 -40 41 20 0.80 40 0 0 -41 36 28 3 31 36.0 37 347 17 -41 46 32 -41 26 26 -41 52 27 -41 20 35 0.80 41 0 0 -42 15 30 3 31 42.4 36 346 18 -42 25 35 -42 5 28 -42 31 30 -41 59 35 0.80 42 0 0 -42 54 17 3 31 48.6 35 345 19 -43 4 22 -42 44 13 -43 10 17 -42 38 20 0.80 43 0 0 -43 32 45 3 31 54.6 34 344 20 -43 42 51 -43 22 41 -43 48 47 -43 16 48 0.80 44 0 0 -44 10 54 3 32 0.4 33 343 21 -44 21 0 -44 0 49 -44 26 56 -43 54 56 0.80 45 0 0 -44 48 42 3 32 6.0 33 342 22 -44 58 49 -44 38 38 -45 4 45 -44 32 44 0.80 46 0 0 -45 26 9 3 32 11.5 32 341 22 -45 36 16 -45 16 4 -45 42 12 -45 10 10 0.80 47 0 0 -46 3 12 3 32 16.8 31 340 23 -46 13 19 -45 53 7 -46 19 15 -45 47 14 0.80 48 0 0 -46 39 51 3 32 21.8 30 339 24 -46 49 58 -46 29 46 -46 55 54 -46 23 53 0.80 49 0 0 -47 16 4 3 32 26.7 29 338 25 -47 26 10 -47 5 59 -47 32 6 -47 0 6 0.80 50 0 0 -47 51 50 3 32 31.5 28 337 25 -48 1 56 -47 41 46 -48 7 52 -47 35 53 0.80 51 0 0 -48 27 8 3 32 36.0 28 336 26 -48 37 14 -48 17 5 -48 43 9 -48 11 12 0.80 52 0 0 -49 1 58 3 32 40.4 27 335 27 -49 12 3 -48 51 55 -49 17 58 -48 46 3 0.80 53 0 0 -49 36 18 3 32 44.5 26 334 27 -49 46 22 -49 26 16 -49 52 17 -49 20 24 0.80 54 0 0 -50 10 7 3 32 48.6 25 333 28 -50 20 10 -50 0 6 -50 26 5 -49 54 15 0.80 55 0 0 -50 43 26 3 32 52.4 24 332 29 -50 53 28 -50 33 26 -50 59 21 -50 27 35 0.80 56 0 0 -51 16 12 3 32 56.1 24 331 29 -51 26 13 -51 6 13 -51 32 6 -51 0 23 0.80 57 0 0 -51 48 26 3 32 59.6 23 330 30 -51 58 26 -51 38 29 -52 4 18 -51 32 40 0.80 58 0 0 -52 20 8 3 33 3.0 22 329 30 -52 30 6 -52 10 11 -52 35 57 -52 4 23 0.80 59 0 0 -52 51 16 3 33 6.2 21 328 31 -53 1 12 -52 41 21 -53 7 2 -52 35 33 0.80 60 0 0 -53 21 50 3 33 9.2 21 327 31 -53 31 45 -53 11 57 -53 37 34 -53 6 10 0.80 61 0 0 -53 51 50 3 33 12.1 20 326 32 -54 1 43 -53 41 59 -54 7 31 -53 36 13 0.80 62 0 0 -54 21 16 3 33 14.9 19 326 32 -54 31 7 -54 11 26 -54 36 54 -54 5 42 0.80 63 0 0 -54 50 7 3 33 17.5 18 325 33 -54 59 57 -54 40 20 -55 5 43 -54 34 36 0.80 64 0 0 -55 18 24 3 33 20.0 18 324 33 -55 28 12 -55 8 39 -55 33 57 -55 2 57 0.80 65 0 0 -55 46 7 3 33 22.3 17 323 34 -55 55 52 -55 36 23 -56 1 36 -55 30 42 0.80 66 0 0 -56 13 15 3 33 24.5 16 322 34 -56 22 58 -56 3 33 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3 33 43.4 8 310 38 -61 23 54 -61 5 35 -61 29 17 -61 0 15 0.80 80 0 0 -61 34 10 3 33 44.3 7 310 38 -61 43 17 -61 25 4 -61 48 39 -61 19 44 0.80 81 0 0 -61 53 5 3 33 45.0 7 309 39 -62 2 10 -61 44 1 -62 7 29 -61 38 44 0.80 82 0 0 -62 11 30 3 33 45.7 6 308 39 -62 20 32 -62 2 29 -62 25 50 -61 57 13 0.80 83 0 0 -62 29 26 3 33 46.3 6 307 39 -62 38 25 -62 20 28 -62 43 42 -62 15 13 0.80 84 0 0 -62 46 53 3 33 46.8 5 306 39 -62 55 50 -62 37 58 -63 1 5 -62 32 44 0.81 85 0 0 -63 3 51 3 33 47.3 5 305 39 -63 12 45 -62 54 59 -63 17 59 -62 49 47 0.81 86 0 0 -63 20 22 3 33 47.8 4 304 39 -63 29 13 -63 11 31 -63 34 25 -63 6 21 0.81 87 0 0 -63 36 24 3 33 48.1 4 303 40 -63 45 13 -63 27 37 -63 50 24 -63 22 28 0.81 88 0 0 -63 52 0 3 33 48.4 3 302 40 -64 0 46 -63 43 15 -64 5 55 -63 38 8 0.81 89 0 0 -64 7 9 3 33 48.7 3 302 40 -64 15 53 -63 58 27 -64 21 0 -63 53 21 0.81 90 0 0 -64 21 52 3 33 48.9 2 301 40 -64 30 33 -64 13 12 -64 35 39 -64 8 8 0.82 91 0 0 -64 36 9 3 33 49.1 2 300 40 -64 44 48 -64 27 32 -64 49 52 -64 22 29 0.83 92 0 0 -64 50 1 3 33 49.2 1 299 40 -64 58 37 -64 41 26 -65 3 40 -64 36 25 0.84 93 0 0 -65 3 28 3 33 49.2 1 298 40 -65 12 2 -64 54 56 -65 17 3 -64 49 56 0.87 94 0 0 -65 16 31 3 33 49.3 0 297 40 -65 25 2 -65 8 1 -65 30 2 -65 3 2 1.23 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 822-00888-1 * constellation : Cancer * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 09 18 58.7076 DE: +11 03 28.378 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 09 18 58.7077 DE: +11 03 28.377 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.0 * B mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (797) Montana asteroid class: approx. diameter [km]: 22 approx. diameter ["]: 0.013 distance from Earth [AU]: 2.28590 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#48 date of fit: 2023 Feb 11 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): 0.016", 0.003", 108.177° remarks: * orbital elements for (797)Montana : Mean anomaly = 247.2162232280 deg Arg. of pericenter = 357.3018670197 deg Long. of node = 238.2501894301 deg Inclination = 4.5188585269 deg Eccentricity = 0.0603541531 Semimajor axis = 2.5351706220 AU Perihelion dist = 2.3821625462 AU Mag: H = 10.50, G = 0.15 Epoch of elements : MJD 60632.14418088 TDT (2024 Nov 18.1442) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482023Feb11,1.65,2024,11,18,3.460354,-0.300614,-0.549348,6.590005,-3.605442,-0.005462,0.001809,0.000000,0.000000 30.5035,10.9538,124.39,-19.32,False TYC 822-00888-1,9.31630764,11.0578828,11.43,10.96,10.71,0.0,0,,9.33875755,10.9538480,4.50,4.30,0,0,0 797,Montana,15.44,21.972,2.2859,0,0,1.722,-13.88,,1.2,0 0,247.1810,2024,11,18,357.3019,238.2502,4.5189,0.06035,2.53517,2.38216,10.50,5.0,0.15 1.293,0.0163,0.0025,108,0.0039,Known errors,0.97,0,-1,-1 20241118_0888-1,60140.70 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org