IOTA/IOTA-ES occultation update for (247) Eukrate / TYC 7454-01239-1 event on 2023 Oct 30, 23:25 UT Visible from South America Summary ------- On 2023 Oct 30 UT, the 141.7 km diameter asteroid (247) Eukrate will occult a 11.4 mag star in the constellation Sagittarius for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.28 mag to 13.52 mag (the magnitude of the asteroid) for at most 6.030 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: 2023 Oct 30, 23:21 - 2023 Oct 30, 23:29 * geocentric midpoint of event [JD]: 2460248.47606245 * magnitude of target star: 11.38 * magnitude drop [mag]: 2.28 * estimated maximum duration [s]: 6.030 * Moon: 94 % sunlit, 127° distance * Sun: 81° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 148 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 0.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.005, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.006", 0.001", 61°) * approx speed of asteroid's shadow [km/s]: 23.4832 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7454-01239-1 by 247 Eukrate on 2023 Oct 30 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 0 0 0 .. .. .... .. .. .. .. .. .. -46 5 18 .. .. .. -46 8 59 .. .. .. .... 137 0 0 -45 56 41 23 21 11.7 1 148 38 -47 12 43 .. .. .. -47 16 22 .. .. .. .... 138 0 0 -47 2 36 23 21 11.9 2 147 38 -48 17 56 -45 48 12 -48 21 32 -45 44 41 0.30 139 0 0 -48 6 22 23 21 12.2 3 146 39 -49 20 56 -46 52 40 -49 24 30 -46 49 11 0.30 140 0 0 -49 7 57 23 21 12.6 5 145 39 -50 21 45 -47 55 1 -50 25 16 -47 51 34 0.30 141 0 0 -50 7 25 23 21 13.2 6 145 39 -51 20 23 -48 55 16 -51 23 53 -48 51 51 0.31 142 0 0 -51 4 46 23 21 13.8 7 144 39 -52 16 55 -49 53 25 -52 20 22 -49 50 3 0.31 143 0 0 -52 0 3 23 21 14.6 8 143 39 -53 11 21 -50 49 32 -53 14 45 -50 46 11 0.31 144 0 0 -52 53 18 23 21 15.4 9 142 39 -54 3 44 -51 43 37 -54 7 6 -51 40 19 0.31 145 0 0 -53 44 34 23 21 16.3 10 141 39 -54 54 7 -52 35 44 -54 57 27 -52 32 28 0.31 146 0 0 -54 33 55 23 21 17.2 11 141 39 -55 42 35 -53 25 55 -55 45 52 -53 22 42 0.31 147 0 0 -55 21 22 23 21 18.2 12 140 39 -56 29 9 -54 14 14 -56 32 24 -54 11 3 0.31 148 0 0 -56 7 0 23 21 19.3 13 139 39 -57 13 54 -55 0 43 -57 17 6 -54 57 35 0.31 149 0 0 -56 50 52 23 21 20.4 14 138 39 -57 56 53 -55 45 26 -58 0 2 -55 42 20 0.31 150 0 0 -57 33 1 23 21 21.5 15 137 39 -58 38 10 -56 28 26 -58 41 16 -56 25 23 0.31 151 0 0 -58 13 31 23 21 22.6 16 136 39 -59 17 47 -57 9 47 -59 20 52 -57 6 46 0.31 152 0 0 -58 52 25 23 21 23.8 17 135 39 -59 55 50 -57 49 31 -59 58 52 -57 46 32 0.31 153 0 0 -59 29 47 23 21 25.0 17 135 39 -60 32 22 -58 27 43 -60 35 21 -58 24 46 0.31 154 0 0 -60 5 40 23 21 26.2 18 134 38 -61 7 25 -59 4 25 -61 10 22 -59 1 31 0.31 155 0 0 -60 40 8 23 21 27.4 19 133 38 -61 41 4 -59 39 41 -61 43 58 -59 36 49 0.31 156 0 0 -61 13 14 23 21 28.6 20 132 38 -62 13 21 -60 13 33 -62 16 13 -60 10 44 0.31 157 0 0 -61 45 1 23 21 29.8 20 131 38 -62 44 21 -60 46 6 -62 47 11 -60 43 19 0.30 158 0 0 -62 15 31 23 21 31.1 21 130 38 -63 14 5 -61 17 23 -63 16 53 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16 23 26 47.5 66 253 -14 -34 51 36 -32 8 3 -34 55 32 -32 4 13 0.30 - 57 0 0 -31 58 50 23 26 55.3 65 250 -16 -33 21 19 -30 37 28 -33 25 16 -30 33 37 0.30 - 56 0 0 -30 26 45 23 27 3.2 64 247 -17 -31 49 19 -29 5 19 -31 53 16 -29 1 28 0.30 - 55 0 0 -28 53 11 23 27 11.2 62 244 -19 -30 15 44 -27 31 47 -30 19 41 -27 27 56 0.30 - 54 0 0 -27 18 20 23 27 19.1 61 242 -20 -28 40 46 -25 57 2 -28 44 43 -25 53 11 0.31 - 53 0 0 -25 42 22 23 27 27.0 59 240 -22 -27 4 37 -24 21 16 -27 8 33 -24 17 26 0.31 - 52 0 0 -24 5 30 23 27 34.8 58 238 -23 -25 27 28 -22 44 40 -25 31 24 -22 40 51 0.31 - 51 0 0 -22 27 56 23 27 42.6 56 236 -25 -23 49 32 -21 7 28 -23 53 27 -21 3 40 0.31 - 50 0 0 -20 49 54 23 27 50.3 54 235 -27 -22 11 3 -19 29 51 -22 14 56 -19 26 4 0.31 - 49 0 0 -19 11 35 23 27 57.8 53 234 -28 -20 32 13 -17 52 2 -20 36 5 -17 48 17 0.31 - 48 0 0 -17 33 13 23 28 5.2 51 232 -30 -18 53 16 -16 14 15 -18 57 6 -16 10 31 0.31 - 47 0 0 -15 55 0 23 28 12.4 49 231 -32 -17 14 24 -14 36 40 -17 18 12 -14 32 58 0.31 - 46 0 0 -14 17 9 23 28 19.4 47 230 -33 -15 35 50 -12 59 30 -15 39 36 -12 55 49 0.31 - 45 0 0 -12 39 50 23 28 26.2 45 229 -35 -13 57 45 -11 22 55 -14 1 29 -11 19 17 0.31 - 44 0 0 -11 3 16 23 28 32.7 44 229 -36 -12 20 22 - 9 47 8 -12 24 4 - 9 43 32 0.31 - 43 0 0 - 9 27 36 23 28 39.0 42 228 -38 -10 43 51 - 8 12 17 -10 47 31 - 8 8 44 0.32 - 42 0 0 - 7 53 0 23 28 45.1 40 227 -40 - 9 8 23 - 6 38 32 - 9 11 59 - 6 35 1 0.32 - 41 0 0 - 6 19 36 23 28 50.8 38 227 -41 - 7 34 5 - 5 6 2 - 7 37 39 - 5 2 33 0.32 - 40 0 0 - 4 47 34 23 28 56.3 36 227 -43 - 6 1 6 - 3 34 53 - 6 4 37 - 3 31 27 0.32 - 39 0 0 - 3 16 58 23 29 1.5 35 226 -44 - 4 29 34 - 2 5 13 - 4 33 3 - 2 1 49 0.32 - 38 0 0 - 1 47 57 23 29 6.5 33 226 -46 - 2 59 35 - 0 37 7 - 3 3 1 - 0 33 46 0.32 - 37 0 0 - 0 20 35 23 29 11.1 31 226 -47 - 1 31 16 0 49 19 - 1 34 39 0 52 37 0.32 - 36 0 0 1 5 3 23 29 15.5 29 226 -49 - 0 4 39 2 14 1 - 0 7 59 2 17 17 0.32 - 35 0 0 2 28 55 23 29 19.5 28 225 -50 1 20 10 3 36 56 1 16 52 3 40 9 0.32 - 34 0 0 3 50 55 23 29 23.3 26 225 -52 2 43 8 4 58 1 2 39 53 5 1 11 0.32 - 33 0 0 5 11 2 23 29 26.8 24 225 -53 4 4 12 6 17 13 4 1 0 6 20 21 0.33 - 32 0 0 6 29 15 23 29 30.1 23 225 -54 5 23 22 7 34 31 5 20 12 7 37 36 0.33 - 31 0 0 7 45 32 23 29 33.1 21 225 -56 6 40 34 8 49 54 6 37 28 8 52 56 0.33 - 30 0 0 8 59 52 23 29 35.8 20 225 -57 7 55 49 10 3 20 7 52 45 10 6 21 0.33 - 29 0 0 10 12 16 23 29 38.3 18 226 -58 9 9 7 11 14 51 9 6 5 11 17 49 0.33 - 28 0 0 11 22 43 23 29 40.5 17 226 -59 10 20 26 12 24 27 10 17 28 12 27 22 0.33 - 27 0 0 12 31 13 23 29 42.5 15 226 -60 11 29 49 13 32 7 11 26 53 13 35 0 0.33 - 26 0 0 13 37 49 23 29 44.3 14 226 -61 12 37 15 14 37 53 12 34 21 14 40 44 0.34 - 25 0 0 14 42 30 23 29 45.9 12 226 -62 13 42 45 15 41 46 13 39 54 15 44 34 0.34 - 24 0 0 15 45 18 23 29 47.3 11 227 -63 14 46 22 16 43 47 14 43 33 16 46 34 0.34 - 23 0 0 16 46 16 23 29 48.5 9 227 -64 15 48 6 17 43 59 15 45 20 17 46 43 0.35 - 22 0 0 17 45 23 23 29 49.5 8 227 -65 16 48 0 18 42 21 16 45 15 18 45 3 0.35 - 21 0 0 18 42 43 23 29 50.3 7 227 -66 17 46 4 19 38 58 17 43 22 19 41 38 0.36 - 20 0 0 19 38 17 23 29 51.0 5 228 -67 18 42 22 20 33 50 18 39 41 20 36 28 0.38 - 19 0 0 20 32 8 23 29 51.5 4 228 -68 19 36 54 21 26 59 19 34 16 21 29 35 0.40 - 18 0 0 21 24 17 23 29 51.8 3 228 -68 20 29 44 22 18 28 20 27 8 22 21 2 0.44 - 17 0 0 22 14 47 23 29 52.0 1 229 -69 21 20 53 23 8 19 21 18 19 23 10 51 0.55 - 16 0 0 23 3 39 23 29 52.1 0 229 -69 22 10 24 .. .. .. 22 7 51 .. .. .. 1.92 Uncertainty in time = +/- 0 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: TYC 7454-01239-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 15 46.4827 DE: -37 00 50.009 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 15 46.4825 DE: -37 00 50.010 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (247) Eukrate asteroid class: approx. diameter [km]: 142 approx. diameter ["]: 0.074 distance from Earth [AU]: 2.62730 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#107 date of fit: 2023 Oct 09 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): 0.006", 0.001", 60.618° remarks: * orbital elements for (247)Eukrate : Mean anomaly = 290.5295841181 deg Arg. of pericenter = 55.3766620501 deg Long. of node = 0.0474252085 deg Inclination = 24.9577514151 deg Eccentricity = 0.2463086928 Semimajor axis = 2.7392556926 AU Perihelion dist = 2.0645532037 AU Mag: H = 8.23, G = 0.15 Epoch of elements : MJD 60247.97604167 TDT (2023 Oct 30.9760) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1072023Oct09,6.03,2023,10,30,23.425499,0.202389,-0.196694,9.249277,9.493934,0.005595,0.001077,0.000000,0.000000 -86.0701,-36.9437,-175.47,-13.94,False TYC 7454-01239-1,20.26291189,-37.0138914,0.00,11.38,0.00,0.0,0,,20.28861146,-36.9437235,2.29,0.00,0,0,0 247,Eukrate,13.52,141.700,2.6273,0,0,2.583,31.78,,7.0,0 0,290.3174,2023,10,30,55.3767,0.0474,24.9578,0.24631,2.73926,2.06455,8.25,5.0,0.15 1.024,0.0060,0.0005,61,0.0060,Known errors,-1.00,0,-1,-1 20231030_1239-1,60232.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 20:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org