IOTA/IOTA-ES occultation update for (86) Semele / UCAC4 326-146923 event on 2023 Jul 13, 14:27 UT Visible from New Zealand Summary ------- On 2023 Jul 13 UT, the 116.4 km diameter asteroid (86) Semele will occult a 11.2 mag star in the constellation Sagittarius for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.51 mag to 13.56 mag (the magnitude of the asteroid) for at most 9.000 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: 99 * date and approx. time of event: 2023 Jul 13, 14:19 - 2023 Jul 13, 14:35 * geocentric midpoint of event [JD]: 2460139.10234829 * magnitude of target star: 11.16 * magnitude drop [mag]: 2.51 * estimated maximum duration [s]: 9.000 * Moon: 17 % sunlit, 147° distance * Sun: 164° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 127 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.025, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.006", 94°) * approx speed of asteroid's shadow [km/s]: 12.9289 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 326-146923 by 86 Semele on 2023 Jul 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 22 0 0 -28 30 20 14 34 53.1 0 118 14 -27 51 21 -29 9 33 -27 42 56 -29 18 4 .... 23 0 0 -28 59 11 14 34 53.0 1 118 13 -28 20 12 -29 38 23 -28 11 48 -29 46 53 0.40 24 0 0 -29 27 49 14 34 52.7 2 117 12 -28 48 52 -30 7 0 -28 40 28 -30 15 30 0.41 25 0 0 -29 56 15 14 34 52.2 3 117 11 -29 17 20 -30 35 24 -29 8 56 -30 43 54 0.42 26 0 0 -30 24 28 14 34 51.5 4 116 10 -29 45 34 -31 3 35 -29 37 11 -31 12 5 0.42 27 0 0 -30 52 27 14 34 50.7 5 116 9 -30 13 35 -31 31 32 -30 5 12 -31 40 2 0.42 28 0 0 -31 20 12 14 34 49.8 6 115 8 -30 41 21 -31 59 15 -30 32 59 -32 7 44 0.42 29 0 0 -31 47 41 14 34 48.7 7 115 7 -31 8 53 -32 26 42 -31 0 31 -32 35 10 0.43 30 0 0 -32 14 55 14 34 47.4 8 114 6 -31 36 9 -32 53 54 -31 27 48 -33 2 21 0.43 31 0 0 -32 41 53 14 34 46.1 9 114 5 -32 3 10 -33 20 49 -31 54 49 -33 29 16 0.43 32 0 0 -33 8 34 14 34 44.5 10 113 4 -32 29 54 -33 47 28 -32 21 34 -33 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59 48 -16 16 21 -14 51 34 -16 24 41 0.81 -133 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -15 47 50 .. .. .. -15 56 9 .... Uncertainty in time = +/- 3 secs Prediction of 2023 May 14.2 Data for the target star ------------------------ * name: UCAC4 326-146923 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 22 12.8715 DE: -24 59 48.602 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 22 12.8715 DE: -24 59 48.602 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (86) Semele asteroid class: approx. diameter [km]: 116 approx. diameter ["]: 0.071 distance from Earth [AU]: 2.26820 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#119 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): 0.025", 0.006", 93.808° remarks: * orbital elements for (86)Semele : Mean anomaly = 268.7658143467 deg Arg. of pericenter = 308.9886651950 deg Long. of node = 86.0688132061 deg Inclination = 4.8220337319 deg Eccentricity = 0.2163181576 Semimajor axis = 3.1041048353 AU Perihelion dist = 2.4326305963 AU Mag: H = 8.77, G = 0.15 Epoch of elements : MJD 60138.60229167 TDT (2023 Jul 13.6023) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1192023Apr24,9.00,2023,7,13,14.456359,0.051830,-0.403417,-7.237891,-0.930216,0.001495,0.000218,0.000001,0.000000 127.8611,-24.9857,-35.40,21.80,False UCAC4 326-146923,18.37024209,-24.9968339,0.00,11.16,0.00,0.0,0,,18.39463553,-24.9857147,2.51,0.00,0,0,0 86,Semele,13.56,116.4,2.2682,0,0,-2.063,-3.60,,5.8,0 0,268.6573,2023,7,13,308.9887,86.0688,4.8220,0.21632,3.10410,2.43263,8.80,5.0,0.15 1.108,0.0253,0.0060,94,0.0077,Known errors,-1.00,-1,-1,-1 20230713_146923,60078.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 14, 04:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org