IOTA/IOTA-ES occultation update for (11193) Merida / UCAC4 336-179485 event on 2024 Nov 05, 09:02 UT Visible from Summary ------- On 2024 Nov 05 UT, the 13.0869879169966 km diameter asteroid (11193) Merida will occult a 10.3 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 9.34 mag to 19.61 mag (the magnitude of the asteroid) for at most 0.460 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 Nov 05, 08:59 - 2024 Nov 05, 09:05 * geocentric midpoint of event [JD]: 2460619.87693279 * magnitude of target star: 10.27 * magnitude drop [mag]: 9.34 * estimated maximum duration [s]: 0.460 * Moon: 14 % sunlit, 16° distance * Sun: 60° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.47 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 86°) * approx speed of asteroid's shadow [km/s]: 29.3812 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 336-179485 by 11193 Merida on 2024 Nov 5 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 - 4 0 0 -37 52 17 8 59 53.4 1 119 45 -37 57 30 -37 47 4 -38 2 29 -37 42 6 .... - 3 0 0 -38 18 59 8 59 53.5 2 118 45 -38 24 12 -38 13 46 -38 29 12 -38 8 48 0.67 - 2 0 0 -38 45 36 8 59 53.6 2 118 46 -38 50 49 -38 40 23 -38 55 49 -38 35 25 0.70 - 1 0 0 -39 12 6 8 59 53.9 3 117 47 -39 17 19 -39 6 53 -39 22 19 -39 1 55 0.72 0 0 0 -39 38 29 8 59 54.2 4 116 47 -39 43 43 -39 33 16 -39 48 42 -39 28 17 0.72 1 0 0 -40 4 44 8 59 54.5 5 116 48 -40 9 58 -39 59 31 -40 14 58 -39 54 33 0.73 2 0 0 -40 30 51 8 59 54.9 6 115 48 -40 36 5 -40 25 38 -40 41 5 -40 20 39 0.73 3 0 0 -40 56 49 8 59 55.4 7 114 49 -41 2 2 -40 51 35 -41 7 2 -40 46 37 0.74 4 0 0 -41 22 36 8 59 55.9 8 114 49 -41 27 50 -41 17 23 -41 32 50 -41 12 24 0.74 5 0 0 -41 48 13 8 59 56.5 9 113 50 -41 53 27 -41 43 0 -41 58 26 -41 38 1 0.74 6 0 0 -42 13 39 8 59 57.2 9 112 50 -42 18 52 -42 8 26 -42 23 52 -42 3 27 0.74 7 0 0 -42 38 53 8 59 57.9 10 112 51 -42 44 6 -42 33 40 -42 49 6 -42 28 42 0.74 8 0 0 -43 3 54 8 59 58.6 11 111 51 -43 9 8 -42 58 42 -43 14 7 -42 53 43 0.74 9 0 0 -43 28 43 8 59 59.4 12 110 51 -43 33 56 -43 23 30 -43 38 55 -43 18 32 0.75 10 0 0 -43 53 18 9 0 0.3 13 109 52 -43 58 31 -43 48 6 -44 3 30 -43 43 8 0.75 11 0 0 -44 17 39 9 0 1.2 14 109 52 -44 22 51 -44 12 27 -44 27 50 -44 7 29 0.75 12 0 0 -44 41 45 9 0 2.1 14 108 52 -44 46 57 -44 36 33 -44 51 56 -44 31 36 0.75 13 0 0 -45 5 37 9 0 3.1 15 107 53 -45 10 48 -45 0 25 -45 15 47 -44 55 28 0.75 14 0 0 -45 29 12 9 0 4.1 16 106 53 -45 34 24 -45 24 1 -45 39 22 -45 19 4 0.75 15 0 0 -45 52 32 9 0 5.2 17 106 53 -45 57 43 -45 47 21 -46 2 41 -45 42 25 0.75 16 0 0 -46 15 36 9 0 6.3 18 105 53 -46 20 46 -46 10 25 -46 25 43 -46 5 29 0.75 17 0 0 -46 38 22 9 0 7.5 18 104 53 -46 43 33 -46 33 12 -46 48 29 -46 28 17 0.75 18 0 0 -47 0 52 9 0 8.7 19 103 54 -47 6 2 -46 55 42 -47 10 58 -46 50 47 0.75 19 0 0 -47 23 4 9 0 9.9 20 103 54 -47 28 13 -47 17 55 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45 14 9 5 22.8 21 257 -25 -39 50 28 -39 40 1 -39 55 28 -39 35 2 0.78 -175 0 0 -39 18 45 9 5 24.2 20 256 -26 -39 23 59 -39 13 32 -39 28 59 -39 8 33 0.78 -174 0 0 -38 52 9 9 5 25.6 19 256 -27 -38 57 22 -38 46 55 -39 2 22 -38 41 57 0.78 -173 0 0 -38 25 26 9 5 27.0 18 255 -28 -38 30 39 -38 20 12 -38 35 39 -38 15 14 0.78 -172 0 0 -37 58 36 9 5 28.3 17 254 -29 -38 3 50 -37 53 24 -38 8 49 -37 48 25 0.79 -171 0 0 -37 31 42 9 5 29.6 16 253 -29 -37 36 55 -37 26 30 -37 41 55 -37 21 31 0.79 -170 0 0 -37 4 43 9 5 30.8 15 253 -30 -37 9 56 -36 59 31 -37 14 55 -36 54 33 0.79 -169 0 0 -36 37 41 9 5 31.9 15 252 -31 -36 42 54 -36 32 29 -36 47 53 -36 27 31 0.79 -168 0 0 -36 10 36 9 5 33.0 14 252 -32 -36 15 48 -36 5 24 -36 20 47 -36 0 27 0.79 -167 0 0 -35 43 29 9 5 34.0 13 251 -33 -35 48 41 -35 38 18 -35 53 39 -35 33 20 0.80 -166 0 0 -35 16 21 9 5 34.9 12 250 -34 -35 21 32 -35 11 10 -35 26 30 -35 6 13 0.80 -165 0 0 -34 49 12 9 5 35.8 11 250 -34 -34 54 23 -34 44 1 -34 59 21 -34 39 5 0.81 -164 0 0 -34 22 4 9 5 36.6 10 249 -35 -34 27 15 -34 16 54 -34 32 12 -34 11 58 0.81 -163 0 0 -33 54 57 9 5 37.4 9 249 -36 -34 0 8 -33 49 47 -34 5 4 -33 44 52 0.82 -162 0 0 -33 27 52 9 5 38.0 8 248 -37 -33 33 2 -33 22 43 -33 37 59 -33 17 48 0.82 -161 0 0 -33 0 51 9 5 38.6 7 247 -37 -33 6 0 -32 55 42 -33 10 56 -32 50 47 0.83 -160 0 0 -32 33 52 9 5 39.2 6 247 -38 -32 39 1 -32 28 44 -32 43 57 -32 23 50 0.85 -159 0 0 -32 6 59 9 5 39.6 5 246 -39 -32 12 7 -32 1 51 -32 17 2 -31 56 57 0.86 -158 0 0 -31 40 11 9 5 40.0 4 246 -40 -31 45 19 -31 35 3 -31 50 13 -31 30 10 0.89 -157 0 0 -31 13 29 9 5 40.3 3 245 -40 -31 18 36 -31 8 22 -31 23 30 -31 3 29 0.93 -156 0 0 -30 46 54 9 5 40.5 2 245 -41 -30 52 1 -30 41 48 -30 56 54 -30 36 56 1.00 -155 0 0 -30 20 27 9 5 40.7 1 244 -42 -30 25 33 -30 15 21 -30 30 25 -30 10 30 1.17 -154 0 0 -29 54 8 9 5 40.8 0 244 -43 -29 59 14 -29 49 3 -30 4 6 -29 44 12 2.23 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 336-179485 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 54 49.9669 DE: -22 51 57.744 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 54 49.9668 DE: -22 51 57.744 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.3 * B mag [mag]: 10.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (11193) Merida asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.004 distance from Earth [AU]: 4.08140 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", 85.872° remarks: * orbital elements for (11193)Merida : Mean anomaly = 196.8507273722 deg Arg. of pericenter = 348.2106632456 deg Long. of node = 115.3639918454 deg Inclination = 2.4263224340 deg Eccentricity = 0.1569369440 Semimajor axis = 3.1938610391 AU Perihelion dist = 2.6926262482 AU Mag: H = 12.95, G = 0.15 Epoch of elements : MJD 60619.37693255 TDT (2024 Nov 05.3769) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482023Apr25,0.46,2024,11,5,9.046387,0.045676,-0.596311,16.534785,1.270863,0.005163,0.000503,-0.000001,0.000000 103.2950,-22.8356,40.21,-15.87,False UCAC4 336-179485,18.91387974,-22.8660399,10.76,10.27,10.01,0.1,0,,18.93861886,-22.8356142,9.34,9.16,0,0,0 11193,Merida,19.61,13.383,4.0814,0,0,2.578,2.74,,1.2,0 0,196.7856,2024,11,5,348.2107,115.3640,2.4263,0.15694,3.19386,2.69263,12.95,5.0,0.15 1.477,0.0127,0.0021,86,0.0021,Known errors,0.82,0,-1,-1 20241105_179485,60140.68 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org