IOTA/IOTA-ES occultation update for (11193) Merida / UCAC4 335-180448 event on 2024 Oct 19, 13:41 UT Visible from Summary ------- On 2024 Oct 19 UT, the 13.1002702496849 km diameter asteroid (11193) Merida will occult a 11.9 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 7.67 mag to 19.54 mag (the magnitude of the asteroid) for at most 0.580 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 Oct 19, 13:37 - 2024 Oct 19, 13:45 * geocentric midpoint of event [JD]: 2460603.07028979 * magnitude of target star: 11.87 * magnitude drop [mag]: 7.67 * estimated maximum duration [s]: 0.580 * Moon: 94 % sunlit, 137° distance * Sun: 73° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.48 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 87°) * approx speed of asteroid's shadow [km/s]: 23.0489 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 335-180448 by 11193 Merida on 2024 Oct 19 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 -29 36 28 13 37 12.8 0 116 58 -29 41 9 -29 31 46 -29 45 42 -29 27 15 .... - 55 0 0 -30 2 52 13 37 12.9 1 116 58 -30 7 33 -29 58 10 -30 12 6 -29 53 38 0.51 - 54 0 0 -30 29 13 13 37 13.1 2 115 59 -30 33 55 -30 24 32 -30 38 28 -30 19 59 0.54 - 53 0 0 -30 55 31 13 37 13.3 3 115 59 -31 0 13 -30 50 49 -31 4 46 -30 46 17 0.55 - 52 0 0 -31 21 45 13 37 13.7 4 114 59 -31 26 26 -31 17 3 -31 30 59 -31 12 31 0.55 - 51 0 0 -31 47 53 13 37 14.2 5 114 60 -31 52 35 -31 43 12 -31 57 8 -31 38 39 0.56 - 50 0 0 -32 13 56 13 37 14.7 6 113 60 -32 18 38 -32 9 15 -32 23 12 -32 4 42 0.56 - 49 0 0 -32 39 53 13 37 15.3 7 113 60 -32 44 35 -32 35 12 -32 49 8 -32 30 39 0.56 - 48 0 0 -33 5 43 13 37 16.0 8 112 61 -33 10 25 -33 1 1 -33 14 58 -32 56 29 0.57 - 47 0 0 -33 31 26 13 37 16.8 9 112 61 -33 36 8 -33 26 44 -33 40 41 -33 22 11 0.57 - 46 0 0 -33 57 0 13 37 17.7 10 111 61 -34 1 41 -33 52 18 -34 6 14 -33 47 46 0.57 - 45 0 0 -34 22 25 13 37 18.7 11 111 61 -34 27 6 -34 17 43 -34 31 39 -34 13 11 0.57 - 44 0 0 -34 47 40 13 37 19.7 12 110 62 -34 52 22 -34 42 59 -34 56 55 -34 38 27 0.57 - 43 0 0 -35 12 45 13 37 20.8 13 109 62 -35 17 27 -35 8 4 -35 22 0 -35 3 32 0.57 - 42 0 0 -35 37 40 13 37 22.0 14 109 62 -35 42 22 -35 32 59 -35 46 54 -35 28 27 0.57 - 41 0 0 -36 2 23 13 37 23.2 15 108 62 -36 7 5 -35 57 42 -36 11 37 -35 53 11 0.57 - 40 0 0 -36 26 55 13 37 24.5 16 107 62 -36 31 36 -36 22 14 -36 36 8 -36 17 43 0.57 - 39 0 0 -36 51 14 13 37 25.9 16 107 62 -36 55 55 -36 46 33 -37 0 27 -36 42 2 0.57 - 38 0 0 -37 15 20 13 37 27.4 17 106 62 -37 20 1 -37 10 40 -37 24 32 -37 6 9 0.57 - 37 0 0 -37 39 13 13 37 28.9 18 106 62 -37 43 53 -37 34 33 -37 48 25 -37 30 2 0.57 - 36 0 0 -38 2 52 13 37 30.5 19 105 61 -38 7 32 -37 58 12 -38 12 3 -37 53 41 0.57 - 35 0 0 -38 26 16 13 37 32.1 20 104 61 -38 30 56 -38 21 37 -38 35 27 -38 17 7 0.57 - 34 0 0 -38 49 26 13 37 33.8 21 103 61 -38 54 5 -38 44 47 -38 58 36 -38 40 17 0.57 - 33 0 0 -39 12 20 13 37 35.6 22 103 61 -39 16 59 -39 7 41 -39 21 30 -39 3 12 0.57 - 32 0 0 -39 34 59 13 37 37.4 22 102 61 -39 39 38 -39 30 21 -39 44 8 -39 25 51 0.57 - 31 0 0 -39 57 22 13 37 39.3 23 101 60 -40 2 0 -39 52 44 -40 6 30 -39 48 15 0.57 - 30 0 0 -40 19 28 13 37 41.2 24 101 60 -40 24 6 -40 14 51 -40 28 35 -40 10 22 0.57 - 29 0 0 -40 41 18 13 37 43.1 25 100 60 -40 45 55 -40 36 41 -40 50 24 -40 32 13 0.57 - 28 0 0 -41 2 51 13 37 45.2 26 99 59 -41 7 28 -40 58 14 -41 11 56 -40 53 46 0.57 - 27 0 0 -41 24 6 13 37 47.2 27 98 59 -41 28 43 -41 19 29 -41 33 10 -41 15 2 0.57 - 26 0 0 -41 45 3 13 37 49.3 27 97 59 -41 49 40 -41 40 27 -41 54 7 -41 36 1 0.57 - 25 0 0 -42 5 43 13 37 51.5 28 97 58 -42 10 19 -42 1 8 -42 14 46 -41 56 41 0.57 - 24 0 0 -42 26 5 13 37 53.6 29 96 58 -42 30 40 -42 21 30 -42 35 6 -42 17 4 0.57 - 23 0 0 -42 46 8 13 37 55.9 30 95 57 -42 50 43 -42 41 33 -42 55 9 -42 37 8 0.57 - 22 0 0 -43 5 52 13 37 58.1 30 94 57 -43 10 27 -43 1 18 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8 58 -52 52 36 0.57 41 0 0 -53 0 41 13 40 51.8 60 10 20 -53 4 50 -52 56 31 -53 8 52 -52 52 30 0.57 42 0 0 -53 0 17 13 40 54.7 60 8 20 -53 4 27 -52 56 8 -53 8 28 -52 52 7 0.57 43 0 0 -52 59 36 13 40 57.6 60 6 19 -53 3 46 -52 55 27 -53 7 47 -52 51 25 0.57 44 0 0 -52 58 37 13 41 0.6 60 4 18 -53 2 47 -52 54 28 -53 6 49 -52 50 27 0.57 45 0 0 -52 57 21 13 41 3.5 60 2 18 -53 1 30 -52 53 11 -53 5 32 -52 49 10 0.57 46 0 0 -52 55 47 13 41 6.5 60 1 17 -52 59 56 -52 51 37 -53 3 58 -52 47 36 0.57 47 0 0 -52 53 55 13 41 9.4 60 359 17 -52 58 5 -52 49 45 -53 2 7 -52 45 44 0.57 48 0 0 -52 51 45 13 41 12.4 60 357 16 -52 55 55 -52 47 35 -52 59 57 -52 43 34 0.57 49 0 0 -52 49 18 13 41 15.4 60 355 15 -52 53 28 -52 45 8 -52 57 30 -52 41 6 0.57 50 0 0 -52 46 33 13 41 18.3 60 353 15 -52 50 43 -52 42 23 -52 54 46 -52 38 21 0.57 51 0 0 -52 43 30 13 41 21.3 60 351 14 -52 47 41 -52 39 20 -52 51 43 -52 35 18 0.57 52 0 0 -52 40 9 13 41 24.3 60 349 14 -52 44 20 -52 35 59 -52 48 23 -52 31 57 0.57 53 0 0 -52 36 31 13 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42 35 -28 56 30 -28 38 4 0.63 139 0 0 -28 20 42 13 45 10.8 8 248 -50 -28 25 23 -28 16 1 -28 29 55 -28 11 30 0.64 140 0 0 -27 54 8 13 45 11.5 7 247 -51 -27 58 49 -27 49 27 -28 3 21 -27 44 56 0.65 141 0 0 -27 27 34 13 45 12.0 6 247 -51 -27 32 15 -27 22 54 -27 36 47 -27 18 23 0.66 142 0 0 -27 1 2 13 45 12.5 5 246 -52 -27 5 43 -26 56 22 -27 10 14 -26 51 51 0.68 143 0 0 -26 34 33 13 45 13.0 4 246 -53 -26 39 13 -26 29 53 -26 43 44 -26 25 22 0.71 144 0 0 -26 8 6 13 45 13.3 3 246 -53 -26 12 46 -26 3 27 -26 17 17 -25 58 56 0.75 145 0 0 -25 41 43 13 45 13.5 2 245 -54 -25 46 23 -25 37 4 -25 50 53 -25 32 34 0.86 146 0 0 -25 15 25 13 45 13.6 1 245 -54 -25 20 4 -25 10 46 -25 24 34 -25 6 17 1.32 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 335-180448 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 38 52.9559 DE: -23 04 39.536 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 38 52.9559 DE: -23 04 39.536 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (11193) Merida asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.005 distance from Earth [AU]: 3.85690 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 25 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): 0.013", 0.002", 87.415° remarks: * orbital elements for (11193)Merida : Mean anomaly = 193.9525296245 deg Arg. of pericenter = 348.2073668038 deg Long. of node = 115.3639942907 deg Inclination = 2.4263082999 deg Eccentricity = 0.1569168408 Semimajor axis = 3.1939214988 AU Perihelion dist = 2.6927414275 AU Mag: H = 12.95, G = 0.15 Epoch of elements : MJD 60602.57028946 TDT (2024 Oct 19.5703) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482023Apr25,0.58,2024,10,19,13.686955,0.020564,-0.493218,12.997685,0.553284,0.005643,0.000393,0.000000,0.000000 46.2663,-23.0566,-29.09,-10.28,False UCAC4 335-180448,18.64804333,-23.0776488,12.82,11.87,11.36,0.1,0,,18.67291065,-23.0566297,7.68,7.74,0,0,0 11193,Merida,19.54,13.380,3.8569,0,0,2.148,1.27,,1.2,0 0,193.8541,2024,10,19,348.2074,115.3640,2.4263,0.15692,3.19392,2.69274,12.95,5.0,0.15 1.484,0.0133,0.0023,87,0.0023,Known errors,0.74,0,-1,-1 20241019_180448,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org