IOTA/IOTA-ES occultation update for (159) Aemilia / UCAC4 530-017639 event on 2023 Nov 13, 15:31 UT Visible from Australia Summary ------- On 2023 Nov 13 UT, the 129.5 km diameter asteroid (159) Aemilia will occult a 12.4 mag star in the constellation Taurus for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.96 mag to 12.83 mag (the magnitude of the asteroid) for at most 20.190 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 Nov 13, 15:16 - 2023 Nov 13, 15:46 * geocentric midpoint of event [JD]: 2460262.14701716 * magnitude of target star: 12.44 * magnitude drop [mag]: 0.96 * estimated maximum duration [s]: 20.190 * Moon: 0 % sunlit, 145° distance * Sun: 143° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 147 * 1 sigma uncertainty interval [path widths]: +/- 0.01 * 1 sigma uncertainty interval [seconds]: +/- 4.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.000", 84°) * approx speed of asteroid's shadow [km/s]: 6.4127 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 530-017639 by 159 Aemilia on 2023 Nov 13 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 80 0 0 -34 45 8 15 46 19.8 0 70 -25 -34 2 44 -35 27 49 -34 1 38 -35 28 57 .... 81 0 0 -34 27 28 15 46 19.6 1 70 -26 -33 45 3 -35 10 11 -33 43 56 -35 11 19 0.27 82 0 0 -34 9 40 15 46 19.1 2 69 -27 -33 27 13 -34 52 24 -33 26 6 -34 53 32 0.38 83 0 0 -33 51 43 15 46 18.3 3 69 -28 -33 9 15 -34 34 29 -33 8 9 -34 35 37 0.43 84 0 0 -33 33 39 15 46 17.2 4 68 -28 -32 51 10 -34 16 26 -32 50 4 -34 17 34 0.46 85 0 0 -33 15 28 15 46 15.9 5 67 -29 -32 32 58 -33 58 16 -32 31 51 -33 59 24 0.48 86 0 0 -32 57 10 15 46 14.3 6 67 -30 -32 14 39 -33 39 59 -32 13 32 -33 41 7 0.49 87 0 0 -32 38 45 15 46 12.4 7 66 -31 -31 56 13 -33 21 35 -31 55 7 -33 22 43 0.50 88 0 0 -32 20 15 15 46 10.3 8 66 -31 -31 37 42 -33 3 5 -31 36 35 -33 4 13 0.50 89 0 0 -32 1 38 15 46 7.9 8 65 -32 -31 19 5 -32 44 29 -31 17 58 -32 45 37 0.51 90 0 0 -31 42 56 15 46 5.2 9 65 -33 -31 0 23 -32 25 48 -30 59 16 -32 26 56 0.51 91 0 0 -31 24 9 15 46 2.2 10 64 -34 -30 41 35 -32 7 2 -30 40 29 -32 8 9 0.52 92 0 0 -31 5 18 15 45 59.0 11 64 -34 -30 22 44 -31 48 11 -30 21 37 -31 49 18 0.52 93 0 0 -30 46 23 15 45 55.4 12 63 -35 -30 3 48 -31 29 15 -30 2 41 -31 30 23 0.52 94 0 0 -30 27 23 15 45 51.6 13 63 -36 -29 44 49 -31 10 16 -29 43 42 -31 11 24 0.52 95 0 0 -30 8 21 15 45 47.5 14 62 -36 -29 25 47 -30 51 13 -29 24 40 -30 52 21 0.53 96 0 0 -29 49 15 15 45 43.1 15 62 -37 -29 6 41 -30 32 8 -29 5 35 -30 33 15 0.53 97 0 0 -29 30 7 15 45 38.5 16 61 -38 -28 47 34 -30 12 59 -28 46 27 -30 14 7 0.53 98 0 0 -29 10 57 15 45 33.5 16 61 -38 -28 28 24 -29 53 49 -28 27 17 -29 54 57 0.53 99 0 0 -28 51 46 15 45 28.3 17 60 -39 -28 9 13 -29 34 36 -28 8 6 -29 35 44 0.53 100 0 0 -28 32 33 15 45 22.8 18 60 -40 -27 50 1 -29 15 23 -27 48 54 -29 16 31 0.53 101 0 0 -28 13 19 15 45 17.0 19 59 -40 -27 30 48 -28 56 8 -27 29 41 -28 57 16 0.53 102 0 0 -27 54 5 15 45 11.0 20 59 -41 -27 11 35 -28 36 53 -27 10 28 -28 38 1 0.53 103 0 0 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Uncertainty in time = +/- 5 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: UCAC4 530-017639 * constellation : Taurus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 05 47 12.7375 DE: +15 53 51.602 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 05 47 12.7375 DE: +15 53 51.602 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (159) Aemilia asteroid class: approx. diameter [km]: 130 approx. diameter ["]: 0.090 distance from Earth [AU]: 1.98380 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#121 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): 0.022", 0.000", 84.437° remarks: * orbital elements for (159)Aemilia : Mean anomaly = 333.3924744520 deg Arg. of pericenter = 333.3074957699 deg Long. of node = 133.8735469199 deg Inclination = 6.1133361062 deg Eccentricity = 0.0999780414 Semimajor axis = 3.1088697864 AU Perihelion dist = 2.7980510741 AU Mag: H = 8.35, G = 0.15 Epoch of elements : MJD 60261.64673611 TDT (2023 Nov 13.6467) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1212023Oct09,20.19,2023,11,13,15.528412,0.068342,-0.463072,-3.580794,-0.527988,-0.003512,0.000556,0.000001,0.000000 161.7314,15.9074,-56.86,-18.00,False UCAC4 530-017639,5.78687152,15.8976672,0.00,12.44,0.00,0.0,0,,5.80993826,15.9074422,0.97,0.00,0,0,0 159,Aemilia,12.83,129.500,1.9838,0,0,-1.100,-2.34,,7.2,0 0,333.2762,2023,11,13,333.3075,133.8735,6.1133,0.09998,3.10887,2.79805,8.35,5.0,0.15 1.013,0.0220,0.0005,84,0.0220,Known errors,-1.00,0,-1,-1 20231113_017639,60232.88 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 21:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org