IOTA/IOTA-ES occultation update for (203) Pompeja / TYC 6849-01750-1 event on 2023 Aug 31, 03:04 UT Visible from South America Summary ------- On 2023 Aug 31 UT, the 117.6 km diameter asteroid (203) Pompeja 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 2.60 mag to 13.87 mag (the magnitude of the asteroid) for at most 21.550 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: 100 * date and approx. time of event: 2023 Aug 31, 02:46 - 2023 Aug 31, 03:22 * geocentric midpoint of event [JD]: 2460187.62836737 * magnitude of target star: 11.37 * magnitude drop [mag]: 2.60 * estimated maximum duration [s]: 21.550 * Moon: 100 % sunlit, 67° distance * Sun: 113° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 130 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.000) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.000", 89°) * approx speed of asteroid's shadow [km/s]: 5.4562 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6849-01750-1 by 203 Pompeja on 2023 Aug 31 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 136 0 0 -39 9 16 2 47 15.4 0 125 42 -39 53 22 .. .. .. -39 55 59 .. .. .. .... 137 0 0 -39 42 8 2 47 15.7 1 124 42 -40 26 9 -38 58 27 -40 28 46 -38 55 53 0.49 138 0 0 -40 14 34 2 47 16.5 2 124 41 -40 58 30 -39 30 59 -41 1 6 -39 28 25 0.50 139 0 0 -40 46 33 2 47 17.5 3 123 41 -41 30 22 -40 3 4 -41 32 58 -40 0 31 0.51 140 0 0 -41 18 5 2 47 18.9 4 122 40 -42 1 47 -40 34 42 -42 4 22 -40 32 9 0.51 141 0 0 -41 49 8 2 47 20.6 5 122 39 -42 32 43 -41 5 51 -42 35 18 -41 3 19 0.51 142 0 0 -42 19 42 2 47 22.6 6 121 39 -43 3 10 -41 36 33 -43 5 44 -41 34 1 0.51 143 0 0 -42 49 47 2 47 24.9 7 120 38 -43 33 7 -42 6 45 -43 35 41 -42 4 14 0.51 144 0 0 -43 19 22 2 47 27.5 8 120 38 -44 2 34 -42 36 28 -44 5 7 -42 33 57 0.51 145 0 0 -43 48 26 2 47 30.4 9 119 37 -44 31 30 -43 5 41 -44 34 3 -43 3 10 0.51 146 0 0 -44 17 1 2 47 33.5 9 118 37 -44 59 56 -43 34 24 -45 2 28 -43 31 54 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59 0.55 - 43 0 0 -15 33 32 3 21 12.0 19 246 -80 -16 17 9 -14 50 14 -16 19 44 -14 47 42 0.55 - 42 0 0 -14 54 28 3 21 20.5 18 246 -80 -15 37 54 -14 11 21 -15 40 29 -14 8 49 0.55 - 41 0 0 -14 15 49 3 21 28.6 17 246 -79 -14 59 5 -13 32 53 -15 1 38 -13 30 22 0.55 - 40 0 0 -13 37 37 3 21 36.1 16 246 -79 -14 20 41 -12 54 52 -14 23 14 -12 52 21 0.56 - 39 0 0 -12 59 52 3 21 43.0 14 245 -78 -13 42 45 -12 17 18 -13 45 17 -12 14 48 0.56 - 38 0 0 -12 22 35 3 21 49.4 13 245 -77 -13 5 17 -11 40 13 -13 7 48 -11 37 43 0.56 - 37 0 0 -11 45 48 3 21 55.2 12 245 -77 -12 28 18 -11 3 37 -12 30 49 -11 1 8 0.56 - 36 0 0 -11 9 31 3 22 0.5 11 245 -76 -11 51 50 -10 27 31 -11 54 20 -10 25 4 0.57 - 35 0 0 -10 33 46 3 22 5.2 10 244 -75 -11 15 52 - 9 51 57 -11 18 22 - 9 49 30 0.57 - 34 0 0 - 9 58 32 3 22 9.4 9 244 -74 -10 40 27 - 9 16 55 -10 42 56 - 9 14 29 0.58 - 33 0 0 - 9 23 51 3 22 13.1 7 244 -73 -10 5 35 - 8 42 26 -10 8 3 - 8 40 0 0.59 - 32 0 0 - 8 49 44 3 22 16.2 6 244 -72 - 9 31 15 - 8 8 29 - 9 33 43 - 8 6 4 0.60 - 31 0 0 - 8 16 10 3 22 18.8 5 244 -71 - 8 57 30 - 7 35 7 - 8 59 57 - 7 32 42 0.61 - 30 0 0 - 7 43 10 3 22 20.9 4 243 -70 - 8 24 19 - 7 2 19 - 8 26 45 - 6 59 55 0.64 - 29 0 0 - 7 10 46 3 22 22.5 3 243 -69 - 7 51 43 - 6 30 6 - 7 54 9 - 6 27 42 0.68 - 28 0 0 - 6 38 57 3 22 23.5 2 243 -68 - 7 19 43 - 5 58 28 - 7 22 8 - 5 56 5 0.78 - 27 0 0 - 6 7 44 3 22 24.1 1 243 -67 - 6 48 19 - 5 27 25 - 6 50 43 - 5 25 3 1.21 Uncertainty in time = +/- 2 secs Prediction of 2023 Aug 6.7 Data for the target star ------------------------ * name: TYC 6849-01750-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 59 47.9337 DE: -26 47 54.902 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 59 47.9332 DE: -26 47 54.902 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (203) Pompeja asteroid class: approx. diameter [km]: 118 approx. diameter ["]: 0.072 distance from Earth [AU]: 2.25730 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#133 date of fit: 2023 Jul 30 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", 0.000", 89.445° remarks: * orbital elements for (203)Pompeja : Mean anomaly = 247.5834770346 deg Arg. of pericenter = 60.1577614897 deg Long. of node = 347.7029007408 deg Inclination = 3.1718969984 deg Eccentricity = 0.0596996582 Semimajor axis = 2.7364137500 AU Perihelion dist = 2.5730507845 AU Mag: H = 8.98, G = 0.15 Epoch of elements : MJD 60187.12833333 TDT (2023 Aug 31.1283) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1332023Jul30,21.55,2023,8,31,3.080817,0.141175,-0.406153,2.911998,1.002280,0.005159,0.000141,0.000001,0.000000 -114.9353,-26.8010,133.92,8.76,False TYC 6849-01750-1,17.99664826,-26.7985839,0.00,11.37,0.00,0.0,0,,18.02131423,-26.8009688,2.60,0.00,0,0,0 203,Pompeja,13.87,117.600,2.2573,0,0,0.848,3.90,,6.8,0 0,247.5555,2023,8,31,60.1578,347.7029,3.1719,0.05970,2.73641,2.57305,8.88,5.0,0.15 1.029,0.0067,0.0002,89,0.0067,Known errors,-1.00,0,-1,-1 20230831_1750-1,60162.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 06, 16:09 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org