IOTA/IOTA-ES occultation update for (1688) Wilkens / UCAC4 478-137487 event on 2024 Dec 27, 16:59 UT Visible from Summary ------- On 2024 Dec 27 UT, the 16.849 km diameter asteroid (1688) Wilkens will occult a 11.1 mag star in the constellation Pisces for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.68 mag to 17.76 mag (the magnitude of the asteroid) for at most 0.630 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: 93 * date and approx. time of event: 2024 Dec 27, 16:54 - 2024 Dec 27, 17:03 * geocentric midpoint of event [JD]: 2460672.20765925 * magnitude of target star: 11.08 * magnitude drop [mag]: 6.68 * estimated maximum duration [s]: 0.630 * Moon: 11 % sunlit, 116° distance * Sun: 77° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.48 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.004", 71°) * approx speed of asteroid's shadow [km/s]: 26.7296 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 478-137487 by 1688 Wilkens on 2024 Dec 27 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 - 88 0 0 -13 10 21 16 55 3.4 0 84 73 -13 14 57 -13 5 45 -13 19 21 -13 1 21 .... - 87 0 0 -13 4 13 16 55 3.4 1 84 73 -13 8 49 -12 59 37 -13 13 13 -12 55 13 0.00 - 86 0 0 -12 57 53 16 55 3.6 2 84 74 -13 2 29 -12 53 17 -13 6 54 -12 48 53 0.02 - 85 0 0 -12 51 22 16 55 3.8 3 83 75 -12 55 58 -12 46 46 -13 0 23 -12 42 21 0.02 - 84 0 0 -12 44 39 16 55 4.0 4 83 75 -12 49 16 -12 40 3 -12 53 40 -12 35 38 0.03 - 83 0 0 -12 37 45 16 55 4.4 5 83 76 -12 42 22 -12 33 9 -12 46 46 -12 28 44 0.03 - 82 0 0 -12 30 40 16 55 4.8 6 83 76 -12 35 16 -12 26 3 -12 39 41 -12 21 39 0.03 - 81 0 0 -12 23 23 16 55 5.3 7 83 77 -12 28 0 -12 18 47 -12 32 25 -12 14 22 0.03 - 80 0 0 -12 15 56 16 55 5.8 8 82 77 -12 20 32 -12 11 19 -12 24 57 -12 6 54 0.03 - 79 0 0 -12 8 17 16 55 6.5 9 82 78 -12 12 54 -12 3 40 -12 17 19 -11 59 15 0.03 - 78 0 0 -12 0 28 16 55 7.2 10 82 78 -12 5 4 -11 55 51 -12 9 30 -11 51 25 0.03 - 77 0 0 -11 52 27 16 55 7.9 11 82 78 -11 57 4 -11 47 50 -12 1 30 -11 43 25 0.03 - 76 0 0 -11 44 16 16 55 8.8 12 82 78 -11 48 54 -11 39 39 -11 53 19 -11 35 14 0.04 - 75 0 0 -11 35 55 16 55 9.7 13 81 78 -11 40 32 -11 31 18 -11 44 58 -11 26 52 0.04 - 74 0 0 -11 27 23 16 55 10.7 14 81 78 -11 32 1 -11 22 46 -11 36 26 -11 18 20 0.04 - 73 0 0 -11 18 41 16 55 11.7 15 81 78 -11 23 19 -11 14 4 -11 27 45 -11 9 38 0.04 - 72 0 0 -11 9 49 16 55 12.8 16 81 78 -11 14 27 -11 5 12 -11 18 53 -11 0 46 0.04 - 71 0 0 -11 0 47 16 55 14.0 17 81 77 -11 5 25 -10 56 9 -11 9 51 -10 51 43 0.04 - 70 0 0 -10 51 35 16 55 15.3 18 80 77 -10 56 13 -10 46 57 -11 0 39 -10 42 31 0.04 - 69 0 0 -10 42 13 16 55 16.6 19 80 77 -10 46 51 -10 37 35 -10 51 17 -10 33 9 0.04 - 68 0 0 -10 32 42 16 55 18.0 20 80 76 -10 37 20 -10 28 4 -10 41 46 -10 23 38 0.04 - 67 0 0 -10 23 1 16 55 19.5 21 80 76 -10 27 40 -10 18 23 -10 32 6 -10 13 57 0.04 - 66 0 0 -10 13 11 16 55 21.1 22 80 75 -10 17 50 -10 8 33 -10 22 16 -10 4 7 0.04 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52 39 16 55 47.4 35 77 65 - 7 57 19 - 7 47 59 - 8 1 47 - 7 43 32 0.04 - 52 0 0 - 7 40 58 16 55 49.9 36 77 64 - 7 45 38 - 7 36 19 - 7 50 6 - 7 31 51 0.04 - 51 0 0 - 7 29 11 16 55 52.4 37 77 63 - 7 33 51 - 7 24 31 - 7 38 19 - 7 20 3 0.04 - 50 0 0 - 7 17 18 16 55 55.1 38 77 62 - 7 21 58 - 7 12 38 - 7 26 26 - 7 8 10 0.04 - 49 0 0 - 7 5 18 16 55 57.7 39 77 61 - 7 9 58 - 7 0 39 - 7 14 27 - 6 56 10 0.04 - 48 0 0 - 6 53 13 16 56 0.5 40 77 60 - 6 57 53 - 6 48 33 - 7 2 22 - 6 44 5 0.04 - 47 0 0 - 6 41 3 16 56 3.3 41 76 59 - 6 45 43 - 6 36 23 - 6 50 11 - 6 31 54 0.04 - 46 0 0 - 6 28 47 16 56 6.1 43 76 58 - 6 33 27 - 6 24 7 - 6 37 56 - 6 19 38 0.04 - 45 0 0 - 6 16 26 16 56 9.1 44 76 58 - 6 21 6 - 6 11 46 - 6 25 35 - 6 7 17 0.04 - 44 0 0 - 6 4 0 16 56 12.0 45 76 57 - 6 8 41 - 5 59 20 - 6 13 9 - 5 54 51 0.04 - 43 0 0 - 5 51 30 16 56 15.1 46 76 56 - 5 56 11 - 5 46 50 - 6 0 39 - 5 42 21 0.04 - 42 0 0 - 5 38 56 16 56 18.2 47 76 55 - 5 43 36 - 5 34 15 - 5 48 5 - 5 29 46 0.04 - 41 0 0 - 5 26 17 16 56 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2 35 48 2 45 8 2 31 20 2 49 36 0.04 - 2 0 0 2 52 17 16 58 54.2 87 25 15 2 47 37 2 56 57 2 43 9 3 1 24 0.04 - 1 0 0 3 3 59 16 58 58.5 87 6 14 2 59 19 3 8 39 2 54 52 3 13 6 0.04 0 0 0 3 15 34 16 59 2.8 87 343 13 3 10 55 3 20 14 3 6 27 3 24 42 0.04 1 0 0 3 27 3 16 59 7.1 87 322 12 3 22 23 3 31 42 3 17 56 3 36 10 0.04 2 0 0 3 38 24 16 59 11.4 87 306 11 3 33 45 3 43 3 3 29 17 3 47 31 0.04 3 0 0 3 49 38 16 59 15.7 86 296 10 3 44 59 3 54 17 3 40 31 3 58 45 0.04 4 0 0 4 0 44 16 59 20.0 85 289 9 3 56 5 4 5 23 3 51 38 4 9 51 0.04 5 0 0 4 11 43 16 59 24.3 84 284 8 4 7 4 4 16 21 4 2 36 4 20 49 0.04 6 0 0 4 22 33 16 59 28.6 83 281 7 4 17 54 4 27 12 4 13 27 4 31 39 0.04 7 0 0 4 33 15 16 59 32.8 82 278 6 4 28 36 4 37 54 4 24 9 4 42 21 0.04 8 0 0 4 43 48 16 59 37.1 81 276 5 4 39 10 4 48 27 4 34 43 4 52 54 0.04 9 0 0 4 54 13 16 59 41.3 80 275 4 4 49 35 4 58 52 4 45 8 5 3 19 0.04 10 0 0 5 4 30 16 59 45.5 79 274 3 4 59 51 5 9 8 4 55 24 5 13 35 0.04 11 0 0 5 14 37 16 59 49.7 78 273 2 5 9 58 5 19 15 5 5 32 5 23 41 0.04 12 0 0 5 24 34 16 59 53.9 77 272 1 5 19 56 5 29 13 5 15 30 5 33 39 0.04 13 0 0 5 34 23 16 59 58.1 76 271 0 5 29 45 5 39 1 5 25 18 5 43 27 0.04 14 0 0 5 44 2 17 0 2.2 75 271 -1 5 39 24 5 48 40 5 34 57 5 53 6 0.04 15 0 0 5 53 31 17 0 6.3 74 270 -2 5 48 53 5 58 9 5 44 27 6 2 35 0.04 16 0 0 6 2 50 17 0 10.4 73 270 -3 5 58 12 6 7 28 5 53 46 6 11 54 0.04 17 0 0 6 11 59 17 0 14.5 72 269 -4 6 7 21 6 16 36 6 2 55 6 21 2 0.04 18 0 0 6 20 58 17 0 18.5 71 269 -5 6 16 20 6 25 35 6 11 54 6 30 1 0.04 19 0 0 6 29 46 17 0 22.5 70 269 -6 6 25 9 6 34 23 6 20 43 6 38 49 0.04 20 0 0 6 38 24 17 0 26.5 69 269 -7 6 33 47 6 43 1 6 29 21 6 47 27 0.04 21 0 0 6 46 51 17 0 30.5 68 268 -8 6 42 14 6 51 28 6 37 48 6 55 54 0.04 22 0 0 6 55 7 17 0 34.4 67 268 -9 6 50 30 6 59 44 6 46 5 7 4 10 0.04 23 0 0 7 3 12 17 0 38.3 66 268 -10 6 58 36 7 7 49 6 54 10 7 12 15 0.05 24 0 0 7 11 7 17 0 42.1 65 268 -11 7 6 30 7 15 43 7 2 5 7 20 9 0.05 25 0 0 7 18 50 17 0 45.9 64 268 -12 7 14 13 7 23 26 7 9 48 7 27 51 0.05 26 0 0 7 26 21 17 0 49.7 63 268 -13 7 21 44 7 30 58 7 17 19 7 35 23 0.05 27 0 0 7 33 41 17 0 53.5 62 268 -14 7 29 5 7 38 18 7 24 40 7 42 42 0.05 28 0 0 7 40 50 17 0 57.2 61 268 -15 7 36 13 7 45 26 7 31 48 7 49 51 0.05 29 0 0 7 47 46 17 1 0.9 60 268 -16 7 43 10 7 52 23 7 38 45 7 56 47 0.05 30 0 0 7 54 31 17 1 4.5 59 268 -17 7 49 55 7 59 7 7 45 30 8 3 32 0.05 31 0 0 8 1 4 17 1 8.1 58 268 -18 7 56 28 8 5 40 7 52 3 8 10 5 0.05 32 0 0 8 7 25 17 1 11.6 57 268 -19 8 2 49 8 12 1 7 58 25 8 16 25 0.05 33 0 0 8 13 34 17 1 15.1 56 268 -20 8 8 58 8 18 10 8 4 34 8 22 34 0.05 34 0 0 8 19 30 17 1 18.6 55 268 -21 8 14 54 8 24 6 8 10 30 8 28 30 0.05 35 0 0 8 25 15 17 1 22.0 54 268 -22 8 20 39 8 29 50 8 16 15 8 34 14 0.05 36 0 0 8 30 46 17 1 25.4 53 268 -23 8 26 11 8 35 22 8 21 47 8 39 46 0.05 37 0 0 8 36 6 17 1 28.7 52 268 -24 8 31 30 8 40 41 8 27 6 8 45 5 0.05 38 0 0 8 41 13 17 1 32.0 51 268 -24 8 36 37 8 45 48 8 32 13 8 50 12 0.05 39 0 0 8 46 7 17 1 35.2 50 268 -25 8 41 31 8 50 42 8 37 8 8 55 6 0.05 40 0 0 8 50 48 17 1 38.4 49 269 -26 8 46 13 8 55 23 8 41 49 8 59 47 0.05 41 0 0 8 55 17 17 1 41.5 48 269 -27 8 50 42 8 59 52 8 46 18 9 4 16 0.05 42 0 0 8 59 33 17 1 44.6 47 269 -28 8 54 58 9 4 8 8 50 34 9 8 32 0.05 43 0 0 9 3 36 17 1 47.6 46 269 -29 8 59 1 9 8 11 8 54 37 9 12 35 0.05 44 0 0 9 7 26 17 1 50.6 45 269 -30 9 2 51 9 12 1 8 58 28 9 16 25 0.05 45 0 0 9 11 3 17 1 53.5 44 269 -31 9 6 28 9 15 38 9 2 5 9 20 2 0.05 46 0 0 9 14 27 17 1 56.3 43 269 -32 9 9 53 9 19 2 9 5 29 9 23 26 0.05 47 0 0 9 17 38 17 1 59.2 42 269 -33 9 13 4 9 22 13 9 8 40 9 26 37 0.05 48 0 0 9 20 36 17 2 1.9 41 269 -34 9 16 2 9 25 11 9 11 38 9 29 34 0.04 49 0 0 9 23 21 17 2 4.6 40 270 -35 9 18 47 9 27 56 9 14 23 9 32 19 0.04 50 0 0 9 25 53 17 2 7.2 39 270 -36 9 21 18 9 30 28 9 16 55 9 34 51 0.04 51 0 0 9 28 12 17 2 9.8 38 270 -37 9 23 37 9 32 46 9 19 14 9 37 9 0.04 52 0 0 9 30 17 17 2 12.3 37 270 -38 9 25 42 9 34 51 9 21 19 9 39 14 0.04 53 0 0 9 32 9 17 2 14.8 36 270 -39 9 27 34 9 36 43 9 23 11 9 41 6 0.04 54 0 0 9 33 48 17 2 17.2 35 270 -40 9 29 13 9 38 22 9 24 50 9 42 45 0.04 55 0 0 9 35 13 17 2 19.6 34 270 -41 9 30 39 9 39 48 9 26 16 9 44 11 0.04 56 0 0 9 36 25 17 2 21.8 33 271 -42 9 31 51 9 41 0 9 27 28 9 45 23 0.04 57 0 0 9 37 24 17 2 24.1 32 271 -42 9 32 50 9 41 59 9 28 27 9 46 22 0.04 58 0 0 9 38 10 17 2 26.2 31 271 -43 9 33 36 9 42 45 9 29 13 9 47 8 0.04 59 0 0 9 38 43 17 2 28.3 30 271 -44 9 34 8 9 43 17 9 29 45 9 47 40 0.04 60 0 0 9 39 2 17 2 30.3 29 271 -45 9 34 27 9 43 36 9 30 4 9 47 59 0.04 61 0 0 9 39 7 17 2 32.3 28 271 -46 9 34 33 9 43 42 9 30 10 9 48 5 0.04 62 0 0 9 39 0 17 2 34.2 27 271 -47 9 34 26 9 43 34 9 30 3 9 47 57 0.04 63 0 0 9 38 39 17 2 36.1 26 272 -48 9 34 5 9 43 14 9 29 42 9 47 37 0.04 64 0 0 9 38 5 17 2 37.8 25 272 -49 9 33 31 9 42 40 9 29 8 9 47 3 0.04 65 0 0 9 37 18 17 2 39.6 24 272 -50 9 32 44 9 41 53 9 28 21 9 46 16 0.04 66 0 0 9 36 18 17 2 41.2 23 272 -51 9 31 43 9 40 52 9 27 20 9 45 15 0.04 67 0 0 9 35 4 17 2 42.8 22 272 -51 9 30 30 9 39 39 9 26 7 9 44 2 0.04 68 0 0 9 33 38 17 2 44.3 21 272 -52 9 29 3 9 38 12 9 24 40 9 42 35 0.04 69 0 0 9 31 58 17 2 45.7 20 273 -53 9 27 23 9 36 32 9 23 0 9 40 55 0.04 70 0 0 9 30 5 17 2 47.1 19 273 -54 9 25 30 9 34 39 9 21 7 9 39 2 0.04 71 0 0 9 27 59 17 2 48.4 18 273 -55 9 23 24 9 32 33 9 19 1 9 36 57 0.04 72 0 0 9 25 40 17 2 49.7 17 273 -56 9 21 5 9 30 15 9 16 42 9 34 38 0.04 73 0 0 9 23 8 17 2 50.8 16 273 -57 9 18 33 9 27 43 9 14 10 9 32 6 0.04 74 0 0 9 20 23 17 2 51.9 15 273 -58 9 15 48 9 24 58 9 11 25 9 29 21 0.04 75 0 0 9 17 25 17 2 53.0 14 274 -58 9 12 51 9 22 0 9 8 27 9 26 23 0.04 76 0 0 9 14 15 17 2 53.9 13 274 -59 9 9 40 9 18 50 9 5 17 9 23 13 0.04 77 0 0 9 10 52 17 2 54.8 12 274 -60 9 6 17 9 15 27 9 1 53 9 19 50 0.04 78 0 0 9 7 16 17 2 55.7 11 274 -61 9 2 41 9 11 51 8 58 17 9 16 14 0.04 79 0 0 9 3 27 17 2 56.4 10 274 -62 8 58 52 9 8 2 8 54 29 9 12 26 0.04 80 0 0 8 59 26 17 2 57.1 9 274 -62 8 54 51 9 4 1 8 50 27 9 8 25 0.04 81 0 0 8 55 12 17 2 57.7 8 274 -63 8 50 37 8 59 48 8 46 14 9 4 11 0.04 82 0 0 8 50 46 17 2 58.3 7 275 -64 8 46 11 8 55 22 8 41 47 8 59 45 0.04 83 0 0 8 46 8 17 2 58.7 6 275 -65 8 41 33 8 50 43 8 37 9 8 55 7 0.04 84 0 0 8 41 17 17 2 59.1 5 275 -65 8 36 42 8 45 53 8 32 18 8 50 17 0.04 85 0 0 8 36 15 17 2 59.5 4 275 -66 8 31 39 8 40 50 8 27 15 8 45 14 0.04 86 0 0 8 31 0 17 2 59.7 3 275 -67 8 26 24 8 35 35 8 22 0 8 39 59 0.04 87 0 0 8 25 33 17 2 59.9 2 275 -67 8 20 57 8 30 8 8 16 33 8 34 32 0.04 88 0 0 8 19 54 17 3 0.0 1 276 -68 8 15 18 8 24 30 8 10 54 8 28 54 0.03 89 0 0 8 14 3 17 3 0.1 0 276 -69 8 9 28 8 18 39 8 5 3 8 23 3 -0.13 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: UCAC4 478-137487 * constellation : Pisces * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 23 21 32.8961 DE: +05 29 56.839 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 23 21 32.8960 DE: +05 29 56.838 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.500,0.200) * V mag [mag]: 11.1 * B mag [mag]: 11.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1688) Wilkens asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.009 distance from Earth [AU]: 2.46400 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#48 date of fit: 2023 Apr 24 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", 0.004", 71.459° remarks: * orbital elements for (1688)Wilkens : Mean anomaly = 60.9058684708 deg Arg. of pericenter = 42.3080913687 deg Long. of node = 245.7315713561 deg Inclination = 11.7580138811 deg Eccentricity = 0.2412617806 Semimajor axis = 2.6178139073 AU Perihelion dist = 1.9862354628 AU Mag: H = 12.77, G = 0.15 Epoch of elements : MJD 60671.70765933 TDT (2024 Dec 27.7077) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482023Apr24,0.63,2024,12,27,16.983822,0.008275,-0.042671,14.824518,2.801569,0.005161,0.002450,0.000000,0.000000 -0.7229,5.6362,-74.41,-23.28,False UCAC4 478-137487,23.35913784,5.4991222,11.31,11.08,10.96,0.0,0,,23.38020838,5.6361963,6.68,6.35,0,0,0 1688,Wilkens,17.76,16.849,2.4640,0,0,3.545,10.00,,1.0,0 0,60.7412,2024,12,27,42.3081,245.7316,11.7580,0.24126,2.61781,1.98624,12.76,5.0,0.15 1.479,0.0160,0.0040,71,0.0045,Known errors,1.54,0,-1,-1 20241227_137487,60140.76 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org