IOTA/IOTA-ES occultation update for (11193) Merida / UCAC4 336-175282 event on 2024 Oct 28, 11:54 UT Visible from Summary ------- On 2024 Oct 28 UT, the 13.1870371937584 km diameter asteroid (11193) Merida will occult a 9.4 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 10.15 mag to 19.59 mag (the magnitude of the asteroid) for at most 0.550 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: 95 * date and approx. time of event: 2024 Oct 28, 11:50 - 2024 Oct 28, 11:58 * geocentric midpoint of event [JD]: 2460611.99624942 * magnitude of target star: 9.44 * magnitude drop [mag]: 10.15 * estimated maximum duration [s]: 0.550 * Moon: 14 % sunlit, 110° distance * Sun: 66° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 16 * 1 sigma uncertainty interval [path widths]: +/- 0.44 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 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]: 26.5103 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 336-175282 by 11193 Merida on 2024 Oct 28 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 - 34 0 0 -24 41 23 11 50 55.2 0 115 58 -24 46 11 -24 36 36 -24 50 24 -24 32 23 .... - 33 0 0 -25 7 24 11 50 55.3 1 115 58 -25 12 12 -25 2 37 -25 16 25 -24 58 24 0.38 - 32 0 0 -25 33 21 11 50 55.4 2 115 59 -25 38 9 -25 28 33 -25 42 22 -25 24 20 0.41 - 31 0 0 -25 59 13 11 50 55.6 3 114 60 -26 4 0 -25 54 25 -26 8 14 -25 50 12 0.42 - 30 0 0 -26 24 59 11 50 55.9 4 114 61 -26 29 47 -26 20 11 -26 34 0 -26 15 58 0.42 - 29 0 0 -26 50 38 11 50 56.3 5 113 61 -26 55 26 -26 45 51 -26 59 39 -26 41 38 0.43 - 28 0 0 -27 16 11 11 50 56.7 6 113 62 -27 20 59 -27 11 24 -27 25 12 -27 7 11 0.43 - 27 0 0 -27 41 37 11 50 57.2 7 112 62 -27 46 24 -27 36 49 -27 50 37 -27 32 37 0.43 - 26 0 0 -28 6 54 11 50 57.8 8 112 63 -28 11 41 -28 2 6 -28 15 54 -27 57 54 0.43 - 25 0 0 -28 32 2 11 50 58.5 9 111 64 -28 36 49 -28 27 15 -28 41 2 -28 23 2 0.43 - 24 0 0 -28 57 1 11 50 59.2 10 111 64 -29 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-24 53 32 -25 7 21 -24 49 19 0.46 149 0 0 -24 32 10 11 58 8.4 15 251 -44 -24 36 58 -24 27 22 -24 41 11 -24 23 9 0.46 150 0 0 -24 5 56 11 58 9.5 14 251 -45 -24 10 44 -24 1 8 -24 14 57 -23 56 55 0.47 151 0 0 -23 39 40 11 58 10.6 13 250 -45 -23 44 28 -23 34 52 -23 48 41 -23 30 39 0.47 152 0 0 -23 13 21 11 58 11.5 12 250 -46 -23 18 9 -23 8 34 -23 22 22 -23 4 21 0.47 153 0 0 -22 47 1 11 58 12.4 11 249 -47 -22 51 49 -22 42 14 -22 56 2 -22 38 1 0.47 154 0 0 -22 20 41 11 58 13.3 10 249 -48 -22 25 28 -22 15 53 -22 29 41 -22 11 41 0.48 155 0 0 -21 54 20 11 58 14.0 9 249 -49 -21 59 8 -21 49 33 -22 3 20 -21 45 21 0.48 156 0 0 -21 28 0 11 58 14.7 7 248 -50 -21 32 48 -21 23 14 -21 37 0 -21 19 1 0.49 157 0 0 -21 1 42 11 58 15.2 6 248 -51 -21 6 29 -20 56 55 -21 10 42 -20 52 43 0.50 158 0 0 -20 35 26 11 58 15.7 5 248 -52 -20 40 13 -20 30 40 -20 44 25 -20 26 28 0.51 159 0 0 -20 9 13 11 58 16.1 4 247 -52 -20 13 59 -20 4 27 -20 18 11 -20 0 15 0.53 160 0 0 -19 43 3 11 58 16.5 3 247 -53 -19 47 49 -19 38 17 -19 52 1 -19 34 6 0.55 161 0 0 -19 16 58 11 58 16.7 2 246 -54 -19 21 44 -19 12 12 -19 25 55 -19 8 1 0.61 162 0 0 -18 50 58 11 58 16.9 1 246 -55 -18 55 43 -18 46 12 -18 59 55 -18 42 1 0.74 163 0 0 -18 25 3 11 58 16.9 0 246 -56 -18 29 48 -18 20 18 -18 33 59 -18 16 7 2.03 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 336-175282 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 46 59.6402 DE: -22 59 09.051 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 46 59.6401 DE: -22 59 09.051 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.400,0.300) * V mag [mag]: 9.4 * B mag [mag]: 10.9 * Diameter [mas]: 0.50 * 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]: 3.97910 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", 86.629° remarks: * orbital elements for (11193)Merida : Mean anomaly = 195.4918248379 deg Arg. of pericenter = 348.2090428241 deg Long. of node = 115.3639913940 deg Inclination = 2.4263160088 deg Eccentricity = 0.1569272816 Semimajor axis = 3.1938902476 AU Perihelion dist = 2.6926817334 AU Mag: H = 12.95, G = 0.15 Epoch of elements : MJD 60611.49624912 TDT (2024 Oct 28.4962) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#482023Apr25,0.55,2024,10,28,11.909986,0.023559,-0.394785,14.935688,0.906537,0.005459,0.000457,-0.000001,0.000000 66.1499,-22.9601,-2.71,-13.37,False UCAC4 336-175282,18.78323341,-22.9858476,10.94,9.44,8.63,0.5,0,,18.80804301,-22.9600738,10.15,10.51,0,0,0 11193,Merida,19.59,14.630,3.9791,0,0,2.390,2.00,,1.2,0 0,195.4061,2024,10,28,348.2090,115.3640,2.4263,0.15693,3.19389,2.69268,12.95,5.0,0.15 1.440,0.0130,0.0022,87,0.0022,Known errors,1.02,0,-1,-1 20241028_175282,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org