IOTA/IOTA-ES occultation update for (86) Semele / UCAC4-322-150815 event on 2023 Sep 27, 11:16 UT Visible from N Australia Summary ------- On 2023 Sep 27 UT, the 116.4 km diameter asteroid (86) Semele will occult a 12.5 mag star in the constellation Sagittarius for observers along a path across N Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.20 mag to 14.52 mag (the magnitude of the asteroid) for at most 7.790 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 27, 11:09 - 2023 Sep 27, 11:24 * geocentric midpoint of event [JD]: 2460214.97003284 * magnitude of target star: 12.47 * magnitude drop [mag]: 2.20 * estimated maximum duration [s]: 7.790 * Moon: 94 % sunlit, 63° distance * Sun: 90° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 117 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.005, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.005", 0.001", 94°) * approx speed of asteroid's shadow [km/s]: 14.9350 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-322-150815 by 86 Semele on 2023 Sep 27 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 12 0 0 .. .. .... .. .. .. .. .. .. 1 51 26 .. .. .. 1 50 13 .. .. .. .... 13 0 0 1 57 29 11 9 44.5 1 116 86 1 22 25 2 32 34 1 21 12 2 33 47 .... 14 0 0 1 28 29 11 9 44.8 2 116 85 0 53 25 2 3 33 0 52 12 2 4 46 0.04 15 0 0 0 59 30 11 9 45.1 3 116 85 0 24 27 1 34 34 0 23 14 1 35 47 0.01 16 0 0 0 30 34 11 9 45.7 4 116 84 - 0 4 29 1 5 37 - 0 5 42 1 6 50 0.00 17 0 0 0 1 40 11 9 46.4 5 116 83 - 0 33 21 0 36 43 - 0 34 34 0 37 56 -0.01 18 0 0 - 0 27 9 11 9 47.2 7 116 82 - 1 2 10 0 7 53 - 1 3 22 0 9 6 -0.02 19 0 0 - 0 55 54 11 9 48.3 8 116 81 - 1 30 53 - 0 20 53 - 1 32 6 - 0 19 40 -0.02 20 0 0 - 1 24 33 11 9 49.4 9 116 80 - 1 59 32 - 0 49 34 - 2 0 44 - 0 48 21 -0.03 21 0 0 - 1 53 7 11 9 50.8 10 116 79 - 2 28 3 - 1 18 9 - 2 29 16 - 1 16 56 -0.03 22 0 0 - 2 21 33 11 9 52.3 11 116 78 - 2 56 28 - 1 46 36 - 2 57 41 - 1 45 24 -0.03 23 0 0 - 2 49 52 11 9 53.9 12 116 77 - 3 24 45 - 2 14 57 - 3 25 58 - 2 13 44 -0.03 24 0 0 - 3 18 2 11 9 55.7 13 116 76 - 3 52 54 - 2 43 9 - 3 54 6 - 2 41 56 -0.03 25 0 0 - 3 46 3 11 9 57.7 14 116 75 - 4 20 53 - 3 11 12 - 4 22 5 - 3 9 59 -0.03 26 0 0 - 4 13 54 11 9 59.8 15 115 74 - 4 48 42 - 3 39 5 - 4 49 54 - 3 37 53 -0.03 27 0 0 - 4 41 35 11 10 2.1 16 115 73 - 5 16 20 - 4 6 48 - 5 17 33 - 4 5 35 -0.04 28 0 0 - 5 9 4 11 10 4.5 18 115 72 - 5 43 47 - 4 34 19 - 5 45 0 - 4 33 7 -0.04 29 0 0 - 5 36 21 11 10 7.1 19 115 71 - 6 11 2 - 5 1 39 - 6 12 14 - 5 0 27 -0.04 30 0 0 - 6 3 26 11 10 9.8 20 115 70 - 6 38 4 - 5 28 46 - 6 39 16 - 5 27 34 -0.04 31 0 0 - 6 30 17 11 10 12.6 21 115 69 - 7 4 53 - 5 55 40 - 7 6 5 - 5 54 28 -0.04 32 0 0 - 6 56 54 11 10 15.6 22 115 68 - 7 31 27 - 6 22 20 - 7 32 39 - 6 21 8 -0.04 33 0 0 - 7 23 17 11 10 18.8 23 115 67 - 7 57 47 - 6 48 45 - 7 58 59 - 6 47 34 -0.04 34 0 0 - 7 49 24 11 10 22.1 24 115 65 - 8 23 51 - 7 14 56 - 8 25 3 - 7 13 44 -0.04 35 0 0 - 8 15 15 11 10 25.5 25 115 64 - 8 49 39 - 7 40 50 - 8 50 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0 54 56 11 23 54.6 6 244 -83 0 19 52 1 30 1 0 18 39 1 31 14 -0.02 -179 0 0 1 23 57 11 23 55.4 5 244 -84 0 48 53 1 59 3 0 47 40 2 0 16 -0.02 -178 0 0 1 53 0 11 23 56.1 4 244 -85 1 17 56 2 28 6 1 16 43 2 29 19 -0.01 -177 0 0 2 22 4 11 23 56.6 3 244 -86 1 47 0 2 57 10 1 45 47 2 58 23 0.00 -176 0 0 2 51 8 11 23 56.9 2 244 -87 2 16 3 3 26 14 2 14 50 3 27 27 0.02 -175 0 0 3 20 11 11 23 57.1 1 244 -88 2 45 7 3 55 17 2 43 54 3 56 30 0.12 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4-322-150815 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 16 15.6923 DE: -25 39 36.719 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 16 15.6922 DE: -25 39 36.719 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (86) Semele asteroid class: approx. diameter [km]: 116 approx. diameter ["]: 0.055 distance from Earth [AU]: 2.93920 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#122 date of fit: 2023 Aug 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): 0.005", 0.001", 94.421° remarks: * orbital elements for (86)Semele : Mean anomaly = 282.4164497138 deg Arg. of pericenter = 309.0143465811 deg Long. of node = 86.0694506278 deg Inclination = 4.8221812208 deg Eccentricity = 0.2163618888 Semimajor axis = 3.1038041042 AU Perihelion dist = 2.4322591857 AU Mag: H = 8.76, G = 0.15 Epoch of elements : MJD 60214.47006944 TDT (2023 Sep 27.4701) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1222023Aug24,7.79,2023,9,27,11.280788,-0.000750,0.058093,8.429055,0.105246,0.005757,0.000178,0.000000,0.000000 99.2268,-25.6532,8.56,-1.63,False UCAC4-322-150815,18.27102567,-25.6601998,0.00,12.47,0.00,0.0,0,,18.29536579,-25.6531533,2.21,0.00,0,0,0 86,Semele,14.52,116.400,2.9392,0,0,1.865,0.31,,5.8,0 0,282.3317,2023,9,27,309.0143,86.0695,4.8222,0.21636,3.10380,2.43226,8.76,5.0,0.15 1.017,0.0050,0.0008,94,0.0051,Known errors,-1.00,0,-1,-1 20230927_150815,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org