IOTA/IOTA-ES occultation update for (29855) 1999 FN27 / UCAC4 520-011750 event on 2024 Dec 15, 19:49 UT Visible from Summary ------- On 2024 Dec 15 UT, the 8.05889163609658 km diameter asteroid (29855) 1999 FN27 will occult a 11.9 mag star in the constellation Orion for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.48 mag to 17.33 mag (the magnitude of the asteroid) for at most 0.680 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 Dec 15, 19:42 - 2024 Dec 15, 19:57 * geocentric midpoint of event [JD]: 2460660.32638133 * magnitude of target star: 11.86 * magnitude drop [mag]: 5.48 * estimated maximum duration [s]: 0.680 * Moon: 99 % sunlit, 18° distance * Sun: 170° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 0.29 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.001", 85°) * approx speed of asteroid's shadow [km/s]: 11.9690 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 520-011750 by 29855 1999 FN27 on 2024 Dec 15 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 - 22 0 0 -38 24 27 19 56 55.2 1 72 8 -38 21 27 -38 27 27 -38 19 42 -38 29 11 .... - 21 0 0 -38 9 11 19 56 55.0 2 71 7 -38 6 12 -38 12 11 -38 4 27 -38 13 56 0.50 - 20 0 0 -37 53 56 19 56 54.7 2 70 6 -37 50 56 -37 56 56 -37 49 12 -37 58 41 0.61 - 19 0 0 -37 38 41 19 56 54.2 3 70 6 -37 35 41 -37 41 41 -37 33 57 -37 43 25 0.66 - 18 0 0 -37 23 26 19 56 53.6 4 69 5 -37 20 27 -37 26 26 -37 18 42 -37 28 11 0.69 - 17 0 0 -37 8 13 19 56 52.9 5 69 4 -37 5 13 -37 11 12 -37 3 29 -37 12 57 0.71 - 16 0 0 -36 53 0 19 56 52.0 6 68 3 -36 50 1 -36 56 0 -36 48 16 -36 57 44 0.73 - 15 0 0 -36 37 49 19 56 50.9 6 67 2 -36 34 50 -36 40 49 -36 33 6 -36 42 33 0.74 - 14 0 0 -36 22 40 19 56 49.7 7 67 1 -36 19 41 -36 25 40 -36 17 57 -36 27 24 0.75 - 13 0 0 -36 7 34 19 56 48.4 8 66 1 -36 4 35 -36 10 33 -36 2 51 -36 12 17 0.75 - 12 0 0 -35 52 30 19 56 46.9 9 66 0 -35 49 31 -35 55 29 -35 47 47 -35 57 13 0.76 - 11 0 0 -35 37 29 19 56 45.3 10 65 -1 -35 34 30 -35 40 28 -35 32 46 -35 42 12 0.76 - 10 0 0 -35 22 31 19 56 43.5 11 64 -2 -35 19 32 -35 25 30 -35 17 48 -35 27 14 0.77 - 9 0 0 -35 7 37 19 56 41.6 12 64 -3 -35 4 38 -35 10 36 -35 2 55 -35 12 20 0.77 - 8 0 0 -34 52 47 19 56 39.5 12 63 -3 -34 49 49 -34 55 46 -34 48 5 -34 57 30 0.77 - 7 0 0 -34 38 2 19 56 37.2 13 63 -4 -34 35 3 -34 41 0 -34 33 19 -34 42 44 0.77 - 6 0 0 -34 23 21 19 56 34.9 14 62 -5 -34 20 22 -34 26 19 -34 18 38 -34 28 3 0.78 - 5 0 0 -34 8 44 19 56 32.3 15 61 -6 -34 5 46 -34 11 43 -34 4 3 -34 13 27 0.78 - 4 0 0 -33 54 14 19 56 29.7 16 61 -7 -33 51 16 -33 57 12 -33 49 32 -33 58 56 0.78 - 3 0 0 -33 39 49 19 56 26.8 17 60 -8 -33 36 51 -33 42 47 -33 35 7 -33 44 31 0.78 - 2 0 0 -33 25 30 19 56 23.9 17 60 -8 -33 22 32 -33 28 28 -33 20 49 -33 30 11 0.78 - 1 0 0 -33 11 17 19 56 20.8 18 59 -9 -33 8 19 -33 14 15 -33 6 36 -33 15 58 0.78 0 0 0 -32 57 11 19 56 17.5 19 58 -10 -32 54 13 -33 0 9 -32 52 30 -33 1 52 0.79 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-29 49 44 19 44 2.0 24 303 -20 -29 46 49 -29 52 40 -29 45 7 -29 54 22 0.82 112 0 0 -30 1 46 19 43 57.9 23 303 -19 -29 58 50 -30 4 41 -29 57 8 -30 6 23 0.82 113 0 0 -30 13 58 19 43 54.0 22 302 -18 -30 11 2 -30 16 54 -30 9 20 -30 18 36 0.82 114 0 0 -30 26 21 19 43 50.1 21 302 -17 -30 23 25 -30 29 17 -30 21 43 -30 30 59 0.82 115 0 0 -30 38 54 19 43 46.5 20 301 -17 -30 35 58 -30 41 51 -30 34 16 -30 43 33 0.82 116 0 0 -30 51 38 19 43 42.9 19 300 -16 -30 48 42 -30 54 34 -30 46 59 -30 56 17 0.82 117 0 0 -31 4 31 19 43 39.5 19 300 -15 -31 1 35 -31 7 28 -30 59 52 -31 9 10 0.82 118 0 0 -31 17 34 19 43 36.3 18 299 -14 -31 14 37 -31 20 31 -31 12 55 -31 22 13 0.82 119 0 0 -31 30 46 19 43 33.2 17 299 -13 -31 27 49 -31 33 43 -31 26 7 -31 35 26 0.82 120 0 0 -31 44 7 19 43 30.3 16 298 -13 -31 41 10 -31 47 4 -31 39 28 -31 48 47 0.82 121 0 0 -31 57 37 19 43 27.5 15 298 -12 -31 54 40 -32 0 34 -31 52 57 -32 2 17 0.82 122 0 0 -32 11 15 19 43 24.9 14 297 -11 -32 8 18 -32 14 12 -32 6 35 -32 15 56 0.82 123 0 0 -32 25 1 19 43 22.4 14 296 -10 -32 22 4 -32 27 59 -32 20 21 -32 29 42 0.83 124 0 0 -32 38 55 19 43 20.0 13 296 -9 -32 35 58 -32 41 53 -32 34 15 -32 43 36 0.83 125 0 0 -32 52 57 19 43 17.9 12 295 -9 -32 49 59 -32 55 54 -32 48 16 -32 57 38 0.83 126 0 0 -33 7 5 19 43 15.8 11 295 -8 -33 4 7 -33 10 3 -33 2 24 -33 11 47 0.83 127 0 0 -33 21 21 19 43 13.9 10 294 -7 -33 18 23 -33 24 19 -33 16 39 -33 26 2 0.83 128 0 0 -33 35 43 19 43 12.2 9 294 -6 -33 32 44 -33 38 41 -33 31 1 -33 40 24 0.83 129 0 0 -33 50 11 19 43 10.7 8 293 -5 -33 47 12 -33 53 9 -33 45 29 -33 54 53 0.84 130 0 0 -34 4 44 19 43 9.2 8 292 -4 -34 1 46 -34 7 43 -34 0 3 -34 9 27 0.84 131 0 0 -34 19 24 19 43 8.0 7 292 -4 -34 16 25 -34 22 23 -34 14 42 -34 24 6 0.84 132 0 0 -34 34 8 19 43 6.9 6 291 -3 -34 31 10 -34 37 7 -34 29 26 -34 38 51 0.85 133 0 0 -34 48 58 19 43 5.9 5 291 -2 -34 45 59 -34 51 57 -34 44 15 -34 53 41 0.85 134 0 0 -35 3 52 19 43 5.1 4 290 -1 -35 0 53 -35 6 51 -34 59 9 -35 8 35 0.86 135 0 0 -35 18 50 19 43 4.5 3 290 0 -35 15 51 -35 21 49 -35 14 7 -35 23 33 0.88 136 0 0 -35 33 51 19 43 4.0 2 289 1 -35 30 52 -35 36 51 -35 29 8 -35 38 35 0.90 137 0 0 -35 48 57 19 43 3.6 2 288 1 -35 45 57 -35 51 56 -35 44 13 -35 53 40 0.94 138 0 0 -36 4 5 19 43 3.4 1 288 2 -36 1 6 -36 7 4 -35 59 21 -36 8 49 1.09 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 520-011750 * constellation : Orion * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 05 18 38.5144 DE: +13 54 04.032 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 05 18 38.5144 DE: +13 54 04.032 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.9 * B mag [mag]: 12.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (29855) 1999 FN27 asteroid class: approx. diameter [km]: 8 approx. diameter ["]: 0.006 distance from Earth [AU]: 1.71120 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#44 date of fit: 2023 Feb 09 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", 0.001", 85.026° remarks: * orbital elements for (29855)1999 FN27 : Mean anomaly = 284.8617854544 deg Arg. of pericenter = 5.3654103531 deg Long. of node = 160.1088686080 deg Inclination = 5.9457928641 deg Eccentricity = 0.0797459796 Semimajor axis = 2.7248393473 AU Perihelion dist = 2.5075443644 AU Mag: H = 13.67, G = 0.15 Epoch of elements : MJD 60659.82638192 TDT (2024 Dec 15.8264) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#442023Feb09,0.68,2024,12,15,19.833152,0.013220,-0.623011,-6.754097,-0.143268,0.000357,0.000959,0.000001,0.000000 57.5646,13.9282,-118.62,-23.32,False UCAC4 520-011750,5.31069845,13.9011200,12.83,11.86,11.34,0.1,0,,5.33464471,13.9282471,5.48,5.55,0,0,0 29855,1999 FN27,17.33,8.183,1.7112,0,0,-2.383,-0.73,,0.8,0 0,284.6807,2024,12,15,5.3654,160.1089,5.9458,0.07975,2.72484,2.50754,13.67,5.0,0.15 1.291,0.0217,0.0013,85,0.0019,Known errors,1.61,0,-1,-1 20241215_011750,60140.74 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org