IOTA/IOTA-ES occultation update for (111) Ate / TYC 6847-01566-1 event on 2024 Oct 20, 19:13 UT Visible from Summary ------- On 2024 Oct 20 UT, the 133.444 km diameter asteroid (111) Ate will occult a 11.5 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.56 mag to 13.94 mag (the magnitude of the asteroid) for at most 4.670 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: 100 * date and approx. time of event: 2024 Oct 20, 19:10 - 2024 Oct 20, 19:16 * geocentric midpoint of event [JD]: 2460604.30102779 * magnitude of target star: 11.49 * magnitude drop [mag]: 2.56 * estimated maximum duration [s]: 4.670 * Moon: 84 % sunlit, 161° distance * Sun: 66° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 151 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.002", 84°) * approx speed of asteroid's shadow [km/s]: 28.5596 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6847-01566-1 by 111 Ate 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 -148 0 0 -29 47 57 19 10 11.1 0 118 51 -30 34 42 .. .. .. -30 37 22 .. .. .. .... -147 0 0 -30 16 17 19 10 11.1 1 118 52 -31 3 3 -29 29 54 -31 5 43 -29 27 17 0.46 -146 0 0 -30 44 31 19 10 11.3 2 117 52 -31 31 17 -29 58 8 -31 33 56 -29 55 31 0.49 -145 0 0 -31 12 37 19 10 11.5 3 117 53 -31 59 23 -30 26 14 -32 2 3 -30 23 37 0.51 -144 0 0 -31 40 35 19 10 11.8 4 116 53 -32 27 20 -30 54 12 -32 30 0 -30 51 35 0.51 -143 0 0 -32 8 24 19 10 12.1 5 116 54 -32 55 9 -31 22 1 -32 57 48 -31 19 24 0.52 -142 0 0 -32 36 3 19 10 12.5 6 115 54 -33 22 47 -31 49 41 -33 25 26 -31 47 4 0.52 -141 0 0 -33 3 31 19 10 13.0 7 115 55 -33 50 14 -32 17 11 -33 52 54 -32 14 34 0.52 -140 0 0 -33 30 49 19 10 13.6 8 114 55 -34 17 30 -32 44 29 -34 20 9 -32 41 53 0.52 -139 0 0 -33 57 54 19 10 14.2 9 114 56 -34 44 34 -33 11 37 -34 47 13 -33 9 0 0.52 -138 0 0 -34 24 47 19 10 14.9 10 113 56 -35 11 25 -33 38 31 -35 14 4 -33 35 55 0.52 -137 0 0 -34 51 27 19 10 15.6 11 112 56 -35 38 3 -34 5 13 -35 40 42 -34 2 37 0.52 -136 0 0 -35 17 53 19 10 16.4 12 112 57 -36 4 27 -34 31 42 -36 7 6 -34 29 5 0.52 -135 0 0 -35 44 5 19 10 17.3 13 111 57 -36 30 36 -34 57 56 -36 33 15 -34 55 20 0.52 -134 0 0 -36 10 2 19 10 18.2 14 111 57 -36 56 30 -35 23 56 -36 59 9 -35 21 20 0.52 -133 0 0 -36 35 44 19 10 19.2 14 110 58 -37 22 8 -35 49 41 -37 24 47 -35 47 5 0.52 -132 0 0 -37 1 9 19 10 20.2 15 109 58 -37 47 31 -36 15 10 -37 50 9 -36 12 34 0.53 -131 0 0 -37 26 19 19 10 21.3 16 109 58 -38 12 37 -36 40 22 -38 15 15 -36 37 47 0.53 -130 0 0 -37 51 11 19 10 22.4 17 108 58 -38 37 25 -37 5 18 -38 40 3 -37 2 43 0.53 -129 0 0 -38 15 46 19 10 23.6 18 107 58 -39 1 56 -37 29 57 -39 4 34 -37 27 22 0.53 -128 0 0 -38 40 3 19 10 24.9 19 107 58 -39 26 9 -37 54 19 -39 28 47 -37 51 44 0.53 -127 0 0 -39 4 3 19 10 26.2 20 106 58 -39 50 4 -38 18 22 -39 52 41 -38 15 48 0.53 -126 0 0 -39 27 43 19 10 27.5 21 105 59 -40 13 40 -38 42 7 -40 16 17 -38 39 33 0.53 -125 0 0 -39 51 5 19 10 28.9 21 105 59 -40 36 57 -39 5 34 -40 39 34 -39 2 59 0.53 -124 0 0 -40 14 7 19 10 30.3 22 104 59 -40 59 55 -39 28 41 -41 2 31 -39 26 7 0.53 -123 0 0 -40 36 50 19 10 31.7 23 103 58 -41 22 33 -39 51 29 -41 25 9 -39 48 55 0.53 -122 0 0 -40 59 13 19 10 33.2 24 102 58 -41 44 51 -40 13 57 -41 47 26 -40 11 24 0.53 -121 0 0 -41 21 17 19 10 34.8 25 102 58 -42 6 48 -40 36 5 -42 9 24 -40 33 32 0.53 -120 0 0 -41 42 59 19 10 36.4 26 101 58 -42 28 26 -40 57 54 -42 31 1 -40 55 21 0.53 -119 0 0 -42 4 22 19 10 38.0 26 100 58 -42 49 42 -41 19 21 -42 52 17 -41 16 49 0.53 -118 0 0 -42 25 23 19 10 39.6 27 99 58 -43 10 38 -41 40 28 -43 13 12 -41 37 56 0.53 -117 0 0 -42 46 4 19 10 41.3 28 99 58 -43 31 13 -42 1 15 -43 33 47 -41 58 43 0.53 -116 0 0 -43 6 23 19 10 43.0 29 98 57 -43 51 26 -42 21 40 -43 54 0 -42 19 8 0.53 -115 0 0 -43 26 21 19 10 44.7 30 97 57 -44 11 19 -42 41 44 -44 13 52 -42 39 13 0.53 -114 0 0 -43 45 58 19 10 46.5 30 96 57 -44 30 49 -43 1 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6847-01566-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 14 30.2260 DE: -24 28 55.122 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 14 30.2260 DE: -24 28 55.122 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.5 * B mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (111) Ate asteroid class: approx. diameter [km]: 133 approx. diameter ["]: 0.059 distance from Earth [AU]: 3.12190 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#126 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): 0.007", 0.002", 83.496° remarks: * orbital elements for (111)Ate : Mean anomaly = 177.2976713761 deg Arg. of pericenter = 168.3026407102 deg Long. of node = 305.6621569782 deg Inclination = 4.9318662711 deg Eccentricity = 0.1032194823 Semimajor axis = 2.5935489757 AU Perihelion dist = 2.3258441931 AU Mag: H = 8.23, G = 0.15 Epoch of elements : MJD 60603.80102758 TDT (2024 Oct 20.8010) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1262023Apr24,4.67,2024,10,20,19.224667,0.041708,-0.460582,16.053028,1.465871,0.005296,0.000099,0.000000,0.000000 -44.1031,-24.4755,-112.21,-10.72,False TYC 6847-01566-1,18.24172949,-24.4819784,11.62,11.49,11.42,0.0,0,,18.26686643,-24.4755482,2.55,2.22,0,0,0 111,Ate,13.94,133.444,3.1219,0,0,3.313,4.13,,8.0,0 0,177.1087,2024,10,20,168.3026,305.6622,4.9319,0.10322,2.59355,2.32584,8.23,5.0,0.15 1.028,0.0070,0.0017,84,0.0017,Known errors,0.56,0,-1,-1 20241020_1566-1,60140.65 ------ 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