IOTA/IOTA-ES occultation update for (3686) Antoku / UCAC4 346-112972 event on 2024 Oct 20, 17:28 UT Visible from Summary ------- On 2024 Oct 20 UT, the 17.3339153967109 km diameter asteroid (3686) Antoku will occult a 11.4 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.58 mag to 17.93 mag (the magnitude of the asteroid) for at most 0.500 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 Oct 20, 17:25 - 2024 Oct 20, 17:31 * geocentric midpoint of event [JD]: 2460604.22824909 * magnitude of target star: 11.35 * magnitude drop [mag]: 6.58 * estimated maximum duration [s]: 0.500 * Moon: 85 % sunlit, 165° distance * Sun: 59° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.001", 97°) * approx speed of asteroid's shadow [km/s]: 34.8658 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 346-112972 by 3686 Antoku on 2024 Oct 20 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 -118 0 0 - 8 5 54 17 25 43.4 0 111 58 - 8 11 10 - 8 0 38 - 8 12 33 - 7 59 15 .... -117 0 0 - 8 29 9 17 25 43.5 1 111 59 - 8 34 25 - 8 23 52 - 8 35 48 - 8 22 29 0.25 -116 0 0 - 8 52 31 17 25 43.6 2 111 60 - 8 57 48 - 8 47 14 - 8 59 11 - 8 45 51 0.26 -115 0 0 - 9 16 0 17 25 43.8 3 111 61 - 9 21 17 - 9 10 43 - 9 22 40 - 9 9 20 0.26 -114 0 0 - 9 39 36 17 25 44.0 4 111 62 - 9 44 53 - 9 34 19 - 9 46 16 - 9 32 56 0.26 -113 0 0 -10 3 18 17 25 44.3 5 110 63 -10 8 35 - 9 58 0 -10 9 58 - 9 56 37 0.26 -112 0 0 -10 27 5 17 25 44.7 6 110 64 -10 32 23 -10 21 47 -10 33 46 -10 20 24 0.26 -111 0 0 -10 50 57 17 25 45.1 8 110 65 -10 56 15 -10 45 39 -10 57 38 -10 44 16 0.26 -110 0 0 -11 14 54 17 25 45.6 9 110 66 -11 20 12 -11 9 36 -11 21 35 -11 8 12 0.26 -109 0 0 -11 38 54 17 25 46.1 10 110 67 -11 44 12 -11 33 36 -11 45 35 -11 32 12 0.26 -108 0 0 -12 2 57 17 25 46.8 11 109 68 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31 -25 51 22 0.27 51 0 0 -25 38 32 17 31 27.0 20 256 -35 -25 43 45 -25 33 19 -25 45 7 -25 31 57 0.27 52 0 0 -25 18 53 17 31 28.1 19 255 -36 -25 24 6 -25 13 39 -25 25 28 -25 12 17 0.27 53 0 0 -24 58 58 17 31 29.1 18 255 -37 -25 4 12 -24 53 44 -25 5 34 -24 52 23 0.27 54 0 0 -24 38 49 17 31 30.0 17 254 -38 -24 44 3 -24 33 35 -24 45 25 -24 32 13 0.27 55 0 0 -24 18 26 17 31 30.9 16 254 -39 -24 23 40 -24 13 11 -24 25 2 -24 11 49 0.27 56 0 0 -23 57 48 17 31 31.8 15 253 -40 -24 3 3 -23 52 34 -24 4 26 -23 51 12 0.27 57 0 0 -23 36 58 17 31 32.6 14 253 -41 -23 42 13 -23 31 43 -23 43 35 -23 30 20 0.27 58 0 0 -23 15 54 17 31 33.3 13 252 -42 -23 21 9 -23 10 39 -23 22 32 -23 9 16 0.28 59 0 0 -22 54 37 17 31 34.0 12 252 -43 -22 59 53 -22 49 21 -23 1 15 -22 47 59 0.28 60 0 0 -22 33 8 17 31 34.7 11 252 -44 -22 38 24 -22 27 52 -22 39 47 -22 26 30 0.28 61 0 0 -22 11 27 17 31 35.3 10 251 -44 -22 16 43 -22 6 11 -22 18 6 -22 4 48 0.28 62 0 0 -21 49 34 17 31 35.8 9 251 -45 -21 54 51 -21 44 18 -21 56 14 -21 42 55 0.29 63 0 0 -21 27 31 17 31 36.3 8 251 -46 -21 32 47 -21 22 14 -21 34 10 -21 20 51 0.29 64 0 0 -21 5 16 17 31 36.7 7 250 -47 -21 10 33 -20 59 59 -21 11 56 -20 58 36 0.30 65 0 0 -20 42 52 17 31 37.1 6 250 -48 -20 48 9 -20 37 34 -20 49 32 -20 36 12 0.30 66 0 0 -20 20 17 17 31 37.4 5 249 -49 -20 25 35 -20 15 0 -20 26 58 -20 13 37 0.31 67 0 0 -19 57 34 17 31 37.7 4 249 -50 -20 2 51 -19 52 16 -20 4 14 -19 50 53 0.33 68 0 0 -19 34 41 17 31 37.9 3 249 -51 -19 39 59 -19 29 24 -19 41 22 -19 28 0 0.35 69 0 0 -19 11 41 17 31 38.0 2 248 -52 -19 16 59 -19 6 23 -19 18 22 -19 5 0 0.40 70 0 0 -18 48 32 17 31 38.1 1 248 -53 -18 53 50 -18 43 14 -18 55 14 -18 41 51 0.59 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 346-112972 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 42 46.8205 DE: -20 56 09.685 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 42 46.8205 DE: -20 56 09.685 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.4 * B mag [mag]: 12.2 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3686) Antoku asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.008 distance from Earth [AU]: 2.93800 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 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): 0.012", 0.001", 96.575° remarks: * orbital elements for (3686)Antoku : Mean anomaly = 56.4257358529 deg Arg. of pericenter = 78.7577654723 deg Long. of node = 134.5336620288 deg Inclination = 5.7257865221 deg Eccentricity = 0.1477253428 Semimajor axis = 2.7403306240 AU Perihelion dist = 2.3355143433 AU Mag: H = 12.57, G = 0.15 Epoch of elements : MJD 60603.72824891 TDT (2024 Oct 20.7282) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,0.50,2024,10,20,17.477978,-0.024245,-0.243282,19.585894,-1.914134,0.004873,-0.000011,-0.000001,0.000000 -25.7727,-20.9482,-86.00,-10.70,False UCAC4 346-112972,17.71300574,-20.9360235,12.20,11.35,10.89,0.1,0,,17.73742557,-20.9482052,6.59,6.59,0,0,0 3686,Antoku,17.93,17.547,2.9380,0,0,4.186,-5.72,,1.2,0 0,56.2675,2024,10,20,78.7578,134.5337,5.7258,0.14773,2.74033,2.33551,12.57,5.0,0.15 1.131,0.0117,0.0011,97,0.0011,Known errors,1.10,0,-1,-1 20241020_112972,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org