IOTA/IOTA-ES occultation update for (134) Sophrosyne / UCAC4 288-157582 event on 2024 Oct 11, 20:31 UT Visible from Summary ------- On 2024 Oct 11 UT, the 104.976 km diameter asteroid (134) Sophrosyne will occult a 9.9 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 4.48 mag to 14.35 mag (the magnitude of the asteroid) for at most 4.080 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: 2024 Oct 11, 20:27 - 2024 Oct 11, 20:35 * geocentric midpoint of event [JD]: 2460595.35517938 * magnitude of target star: 9.89 * magnitude drop [mag]: 4.48 * estimated maximum duration [s]: 4.080 * Moon: 61 % sunlit, 31° distance * Sun: 72° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 116 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.003", 94°) * approx speed of asteroid's shadow [km/s]: 25.7346 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 288-157582 by 134 Sophrosyne on 2024 Oct 11 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 -139 0 0 10 4 49 20 27 43.7 1 123 70 9 27 31 10 42 20 9 22 24 10 47 32 .... -138 0 0 9 26 35 20 27 43.8 2 123 71 8 49 27 10 3 57 8 44 20 10 9 8 -0.23 -137 0 0 8 48 51 20 27 44.0 3 124 72 8 11 52 9 26 3 8 6 46 9 31 12 -0.32 -136 0 0 8 11 37 20 27 44.4 4 124 73 7 34 47 8 48 39 7 29 43 8 53 47 -0.36 -135 0 0 7 34 54 20 27 44.9 5 124 74 6 58 13 8 11 47 6 53 11 8 16 53 -0.38 -134 0 0 6 58 43 20 27 45.5 7 124 75 6 22 12 7 35 26 6 17 11 7 40 32 -0.40 -133 0 0 6 23 5 20 27 46.1 8 124 76 5 46 44 6 59 39 5 41 44 7 4 43 -0.41 -132 0 0 5 48 1 20 27 46.9 9 124 77 5 11 49 6 24 26 5 6 50 6 29 28 -0.42 -131 0 0 5 13 32 20 27 47.9 10 124 77 4 37 29 5 49 47 4 32 32 5 54 48 -0.42 -130 0 0 4 39 38 20 27 48.9 11 124 78 4 3 45 5 15 43 3 58 48 5 20 43 -0.43 -129 0 0 4 6 20 20 27 50.0 12 125 78 3 30 36 4 42 15 3 25 41 4 47 14 -0.43 -128 0 0 3 33 38 20 27 51.2 13 125 79 2 58 4 4 9 24 2 53 10 4 14 22 -0.43 -127 0 0 3 1 34 20 27 52.5 15 125 79 2 26 8 3 37 11 2 21 16 3 42 7 -0.44 -126 0 0 2 30 7 20 27 53.9 16 125 79 1 54 51 3 5 35 1 50 0 3 10 29 -0.44 -125 0 0 1 59 18 20 27 55.5 17 125 79 1 24 11 2 34 37 1 19 21 2 39 30 -0.44 -124 0 0 1 29 8 20 27 57.1 18 125 79 0 54 10 2 4 18 0 49 21 2 9 10 -0.44 -123 0 0 0 59 37 20 27 58.8 19 125 79 0 24 48 1 34 38 0 20 1 1 39 29 -0.45 -122 0 0 0 30 46 20 28 0.6 20 125 78 - 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 288-157582 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 04 09.2598 DE: -32 30 40.810 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 04 09.2597 DE: -32 30 40.810 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 9.9 * B mag [mag]: 10.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (134) Sophrosyne asteroid class: approx. diameter [km]: 105 approx. diameter ["]: 0.050 distance from Earth [AU]: 2.91060 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#131 date of fit: 2023 Apr 24 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", 0.003", 93.841° remarks: * orbital elements for (134)Sophrosyne : Mean anomaly = 228.0641006925 deg Arg. of pericenter = 85.6377100655 deg Long. of node = 345.8405718560 deg Inclination = 11.6105522160 deg Eccentricity = 0.1150632979 Semimajor axis = 2.5636961634 AU Perihelion dist = 2.2687088280 AU Mag: H = 8.82, G = 0.28 Epoch of elements : MJD 60594.85517925 TDT (2024 Oct 11.8552) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1312023Apr24,4.08,2024,10,11,20.524305,-0.096541,0.418103,14.152686,3.269050,0.005476,-0.000225,-0.000001,0.000000 -57.3423,-32.5119,-131.23,-7.45,False UCAC4 288-157582,18.06923887,-32.5113361,9.95,9.89,9.86,0.0,0,,18.09606754,-32.5118502,4.48,4.07,0,0,0 134,Sophrosyne,14.35,104.976,2.9106,0,0,3.381,9.88,,5.2,0 0,227.8588,2024,10,11,85.6377,345.8406,11.6106,0.11506,2.56370,2.26871,8.81,5.0,0.15 1.069,0.0073,0.0028,94,0.0034,Known errors,0.69,0,-1,-1 20241011_157582,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org