IOTA/IOTA-ES occultation update for (247) Eukrate / UCAC4 208-186018 event on 2023 Sep 04, 01:55 UT Visible from South America Summary ------- On 2023 Sep 04 UT, the 141.7 km diameter asteroid (247) Eukrate will occult a 13.8 mag star in the constellation Telescopium 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 0.43 mag to 13.01 mag (the magnitude of the asteroid) for at most 11.120 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 Sep 04, 01:48 - 2023 Sep 04, 02:01 * geocentric midpoint of event [JD]: 2460191.57999308 * magnitude of target star: 13.80 * magnitude drop [mag]: 0.43 * estimated maximum duration [s]: 11.120 * Moon: 78 % sunlit, 104° distance * Sun: 125° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 194 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 0.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.001", 71°) * approx speed of asteroid's shadow [km/s]: 12.7428 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 208-186018 by 247 Eukrate on 2023 Sep 4 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 ' " Longitude Longitude Longitude Longitude - 56 40 16 40 0 0 2 1 16.5 0 191 -37 - 55 28 58 - 57 50 21 - 55 17 46 - 58 1 7 .... - 56 54 28 39 0 0 2 1 16.4 1 191 -38 - 55 44 25 - 58 3 20 - 55 33 26 - 58 13 55 0.53 - 57 6 55 38 0 0 2 1 16.0 2 191 -38 - 55 58 2 - 58 14 39 - 55 47 14 - 58 25 4 0.72 - 57 17 42 37 0 0 2 1 15.4 3 191 -39 - 56 9 55 - 58 24 24 - 55 59 17 - 58 34 39 0.79 - 57 26 55 36 0 0 2 1 14.6 4 191 -40 - 56 20 9 - 58 32 38 - 56 9 41 - 58 42 44 0.83 - 57 34 38 35 0 0 2 1 13.6 5 191 -41 - 56 28 48 - 58 39 26 - 56 18 29 - 58 49 24 0.86 - 57 40 54 34 0 0 2 1 12.4 6 191 -41 - 56 35 57 - 58 44 51 - 56 25 47 - 58 54 42 0.88 - 57 45 48 33 0 0 2 1 11.0 7 191 -42 - 56 41 40 - 58 48 58 - 56 31 37 - 58 58 41 0.89 - 57 49 22 32 0 0 2 1 9.4 8 191 -43 - 56 46 0 - 58 51 48 - 56 36 4 - 59 1 24 0.90 - 57 51 40 31 0 0 2 1 7.6 9 191 -44 - 56 49 0 - 58 53 25 - 56 39 11 - 59 2 55 0.91 - 57 52 44 30 0 0 2 1 5.6 10 191 -44 - 56 50 43 - 58 53 50 - 56 41 0 - 59 3 15 0.92 - 57 52 36 29 0 0 2 1 3.4 11 191 -45 - 56 51 11 - 58 53 7 - 56 41 34 - 59 2 26 -0.92 - 57 51 18 28 0 0 2 1 1.0 12 191 -46 - 56 50 27 - 58 51 17 - 56 40 56 - 59 0 31 -0.93 - 57 48 53 27 0 0 2 0 58.4 13 191 -47 - 56 48 33 - 58 48 22 - 56 39 6 - 58 57 32 -0.93 - 57 45 22 26 0 0 2 0 55.6 14 191 -47 - 56 45 30 - 58 44 23 - 56 36 7 - 58 53 29 -0.93 - 57 40 46 25 0 0 2 0 52.6 15 191 -48 - 56 41 19 - 58 39 22 - 56 32 1 - 58 48 23 -0.94 - 57 35 6 24 0 0 2 0 49.4 16 191 -49 - 56 36 3 - 58 33 20 - 56 26 49 - 58 42 18 -0.94 - 57 28 24 23 0 0 2 0 46.0 17 191 -50 - 56 29 42 - 58 26 17 - 56 20 31 - 58 35 12 -0.94 - 57 20 41 22 0 0 2 0 42.4 18 191 -51 - 56 22 18 - 58 18 15 - 56 13 9 - 58 27 7 -0.94 - 57 11 56 21 0 0 2 0 38.6 19 191 -51 - 56 13 50 - 58 9 14 - 56 4 44 - 58 18 3 -0.94 - 57 2 11 20 0 0 2 0 34.6 20 192 -52 - 56 4 20 - 57 59 15 - 55 55 16 - 58 8 2 -0.94 - 56 51 27 19 0 0 2 0 30.4 21 192 -53 - 55 53 47 - 57 48 18 - 55 44 46 - 57 57 3 -0.95 - 56 39 43 18 0 0 2 0 26.0 22 192 -54 - 55 42 14 - 57 36 24 - 55 33 14 - 57 45 7 -0.95 - 56 26 59 17 0 0 2 0 21.4 23 192 -55 - 55 29 38 - 57 23 32 - 55 20 40 - 57 32 14 -0.95 - 56 13 16 16 0 0 2 0 16.6 24 192 -55 - 55 16 1 - 57 9 42 - 55 7 4 - 57 18 24 -0.95 - 55 58 33 15 0 0 2 0 11.7 25 193 -56 - 55 1 23 - 56 54 55 - 54 52 26 - 57 3 36 -0.95 - 55 42 51 14 0 0 2 0 6.5 26 193 -57 - 54 45 42 - 56 39 10 - 54 36 45 - 56 47 50 -0.95 - 55 26 8 13 0 0 2 0 1.1 27 193 -58 - 54 28 59 - 56 22 27 - 54 20 3 - 56 31 7 -0.95 - 55 8 24 12 0 0 1 59 55.6 27 193 -59 - 54 11 13 - 56 4 44 - 54 2 16 - 56 13 25 -0.95 - 54 49 38 11 0 0 1 59 49.8 28 194 -59 - 53 52 23 - 55 46 2 - 53 43 26 - 55 54 43 -0.95 - 54 29 50 10 0 0 1 59 43.9 29 194 -60 - 53 32 29 - 55 26 20 - 53 23 30 - 55 35 2 -0.95 - 54 8 58 9 0 0 1 59 37.7 30 194 -61 - 53 11 29 - 55 5 36 - 53 2 28 - 55 14 19 -0.95 - 53 47 2 8 0 0 1 59 31.3 31 195 -62 - 52 49 21 - 54 43 49 - 52 40 19 - 54 52 34 -0.95 - 53 23 59 7 0 0 1 59 24.8 32 195 -63 - 52 26 5 - 54 20 59 - 52 17 1 - 54 29 45 -0.95 - 52 59 49 6 0 0 1 59 18.0 33 196 -63 - 52 1 39 - 53 57 3 - 51 52 33 - 54 5 51 -0.95 - 52 34 29 5 0 0 1 59 11.1 34 196 -64 - 51 36 1 - 53 32 0 - 51 26 51 - 53 40 51 -0.95 - 52 7 57 4 0 0 1 59 3.9 34 197 -65 - 51 9 8 - 53 5 48 - 50 59 55 - 53 14 42 -0.95 - 51 40 12 3 0 0 1 58 56.5 35 197 -66 - 50 40 59 - 52 38 25 - 50 31 42 - 52 47 22 -0.95 - 51 11 10 2 0 0 1 58 48.9 36 198 -67 - 50 11 31 - 52 9 48 - 50 2 10 - 52 18 49 -0.95 - 50 40 49 1 0 0 1 58 41.1 37 198 -68 - 49 40 40 - 51 39 55 - 49 31 14 - 51 49 0 -0.95 - 50 9 7 0 0 0 1 58 33.1 38 199 -68 - 49 8 24 - 51 8 43 - 48 58 53 - 51 17 53 -0.95 - 49 35 58 - 1 0 0 1 58 24.9 38 200 -69 - 48 34 39 - 50 36 9 - 48 25 2 - 50 45 24 -0.94 - 49 1 21 - 2 0 0 1 58 16.4 39 200 -70 - 47 59 21 - 50 2 10 - 47 49 37 - 50 11 30 -0.94 - 48 25 9 - 3 0 0 1 58 7.7 40 201 -71 - 47 22 24 - 49 26 41 - 47 12 33 - 49 36 7 -0.94 - 47 47 20 - 4 0 0 1 57 58.8 41 202 -72 - 46 43 45 - 48 49 37 - 46 33 46 - 48 59 11 -0.94 - 47 7 47 - 5 0 0 1 57 49.6 41 202 -72 - 46 3 18 - 48 10 55 - 45 53 10 - 48 20 37 -0.94 - 46 26 25 - 6 0 0 1 57 40.2 42 203 -73 - 45 20 56 - 47 30 29 - 45 10 38 - 47 40 19 -0.94 - 45 43 7 - 7 0 0 1 57 30.6 43 204 -74 - 44 36 31 - 46 48 13 - 44 26 2 - 46 58 11 -0.94 - 44 57 46 - 8 0 0 1 57 20.6 43 205 -75 - 43 49 57 - 46 3 59 - 43 39 16 - 46 14 8 -0.94 - 44 10 13 - 9 0 0 1 57 10.4 44 206 -75 - 43 1 3 - 45 17 41 - 42 50 9 - 45 28 1 -0.94 - 43 20 19 -10 0 0 1 57 0.0 44 207 -76 - 42 9 38 - 44 29 10 - 41 58 30 - 44 39 42 -0.94 - 42 27 53 -11 0 0 1 56 49.2 45 208 -77 - 41 15 32 - 43 38 15 - 41 4 7 - 43 49 0 -0.94 - 41 32 42 -12 0 0 1 56 38.1 45 209 -77 - 40 18 30 - 42 44 45 - 40 6 46 - 42 55 46 -0.94 - 40 34 31 -13 0 0 1 56 26.7 46 210 -78 - 39 18 14 - 41 48 29 - 39 6 10 - 41 59 46 -0.94 - 39 33 5 -14 0 0 1 56 14.9 46 211 -78 - 38 14 26 - 40 49 10 - 38 1 59 - 41 0 46 -0.94 - 38 28 2 -15 0 0 1 56 2.7 46 212 -78 - 37 6 43 - 39 46 30 - 36 53 49 - 39 58 27 -0.94 - 37 18 58 -16 0 0 1 55 50.1 47 214 -78 - 35 54 36 - 38 40 10 - 35 41 11 - 38 52 31 -0.93 - 36 5 26 -17 0 0 1 55 37.1 47 215 -78 - 34 37 31 - 37 29 44 - 34 23 31 - 37 42 32 -0.93 - 34 46 47 -18 0 0 1 55 23.5 47 216 -78 - 33 14 43 - 36 14 42 - 33 0 1 - 36 28 0 -0.93 - 33 22 17 -19 0 0 1 55 9.4 47 217 -78 - 31 45 19 - 34 54 25 - 31 29 46 - 35 8 20 -0.93 - 31 50 58 -20 0 0 1 54 54.5 47 219 -77 - 30 8 2 - 33 28 8 - 29 51 28 - 33 42 45 -0.93 - 30 11 32 -21 0 0 1 54 38.9 47 220 -76 - 28 21 13 - 31 54 48 - 28 3 21 - 32 10 17 -0.93 - 28 22 12 -22 0 0 1 54 22.3 46 221 -75 - 26 22 24 - 30 13 4 - 26 2 51 - 30 29 36 -0.93 - 26 20 23 -23 0 0 1 54 4.5 46 223 -74 - 24 7 52 - 28 21 2 - 23 45 58 - 28 38 54 -0.93 - 24 2 4 -24 0 0 1 53 45.1 45 224 -73 - 21 31 12 - 26 15 59 - 21 5 46 - 26 35 35 -0.94 - 21 20 19 -25 0 0 1 53 23.5 44 225 -71 - 18 19 40 - 23 53 31 - 17 48 0 - 24 15 34 -0.94 - 18 0 51 -26 0 0 1 52 58.2 43 227 -69 - 13 58 13 - 21 6 2 - 13 10 24 - 21 31 48 -0.94 - 13 21 53 -27 0 0 1 52 25.0 41 228 -66 ... .. .. - 17 37 20 ... .. .. - 18 9 51 -0.95 .. .. .. -28 0 0 .. .. .... .. .. .. ... .. .. - 12 35 47 ... .. .. - 13 27 23 .... Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 208-186018 * constellation : Telescopium * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 56 41.2116 DE: -48 35 41.444 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 56 41.2116 DE: -48 35 41.444 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 13.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (247) Eukrate asteroid class: approx. diameter [km]: 142 approx. diameter ["]: 0.093 distance from Earth [AU]: 2.10460 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#106 date of fit: 2023 Aug 22 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", 0.001", 70.763° remarks: * orbital elements for (247)Eukrate : Mean anomaly = 278.1644470839 deg Arg. of pericenter = 55.3685868691 deg Long. of node = 0.0481563143 deg Inclination = 24.9574777091 deg Eccentricity = 0.2462753777 Semimajor axis = 2.7393222543 AU Perihelion dist = 2.0646946316 AU Mag: H = 8.24, G = 0.15 Epoch of elements : MJD 60191.08006945 TDT (2023 Sep 04.0801) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1062023Aug22,11.12,2023,9,4,1.919834,0.589919,0.342122,-3.608274,6.221810,0.003796,0.002582,0.000001,0.000000 -72.1253,-48.5338,151.02,7.32,False UCAC4 208-186018,19.94478102,-48.5948454,0.00,13.80,0.00,0.0,0,,19.97398485,-48.5338039,0.43,0.00,0,0,1 247,Eukrate,13.01,141.700,2.1046,0,0,-1.517,26.00,,7.0,0 0,277.9297,2023,9,3,55.3686,0.0482,24.9575,0.24628,2.73932,2.06469,8.25,5.0,0.15 1.078,0.0073,0.0008,71,0.0074,Known errors,-1.00,0,-1,-1 20230904_186018,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org