IOTA/IOTA-ES occultation update for (86) Semele / UCAC4 327-160602 event on 2023 Jun 29, 10:36 UT Visible from New Zealand, Australia Summary ------- On 2023 Jun 29 UT, the 116.4 km diameter asteroid (86) Semele will occult a 11.1 mag star in the constellation Sagittarius for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.33 mag to 13.26 mag (the magnitude of the asteroid) for at most 8.440 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 Jun 29, 10:29 - 2023 Jun 29, 10:44 * geocentric midpoint of event [JD]: 2460124.94217833 * magnitude of target star: 11.06 * magnitude drop [mag]: 2.33 * estimated maximum duration [s]: 8.440 * Moon: 80 % sunlit, 54° distance * Sun: 178° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 119 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.006", 92°) * approx speed of asteroid's shadow [km/s]: 13.7954 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 327-160602 by 86 Semele on 2023 Jun 29 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 101 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -20 42 54 .. .. .. -20 51 5 .... 102 0 0 -20 34 44 10 44 14.3 1 116 -1 -19 58 47 -21 10 46 -19 50 39 -21 18 56 .... 103 0 0 -21 2 24 10 44 14.1 2 116 -2 -20 26 29 -21 38 24 -20 18 22 -21 46 33 0.24 104 0 0 -21 29 49 10 44 13.7 3 115 -3 -20 53 57 -22 5 47 -20 45 51 -22 13 56 0.23 105 0 0 -21 57 0 10 44 13.1 4 115 -4 -21 21 10 -22 32 54 -21 13 4 -22 41 3 0.23 106 0 0 -22 23 54 10 44 12.5 5 114 -5 -21 48 8 -22 59 46 -21 40 2 -23 7 54 0.23 107 0 0 -22 50 33 10 44 11.6 6 114 -6 -22 14 49 -23 26 22 -22 6 44 -23 34 29 0.22 108 0 0 -23 16 54 10 44 10.6 7 114 -7 -22 41 13 -23 52 40 -22 33 9 -24 0 47 0.22 109 0 0 -23 42 59 10 44 9.5 8 113 -8 -23 7 21 -24 18 42 -22 59 18 -24 26 48 0.22 110 0 0 -24 8 45 10 44 8.2 9 113 -9 -23 33 11 -24 44 25 -23 25 8 -24 52 31 0.22 111 0 0 -24 34 14 10 44 6.8 10 112 -10 -23 58 43 -25 9 51 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16.1 6 246 -5 - 5 28 22 - 6 39 57 - 5 20 17 - 6 48 4 0.27 - 68 0 0 - 5 35 38 10 29 15.3 4 246 -4 - 4 59 56 - 6 11 25 - 4 51 51 - 6 19 32 0.28 - 67 0 0 - 5 7 18 10 29 14.7 3 246 -3 - 4 31 39 - 5 43 3 - 4 23 35 - 5 51 10 0.30 - 66 0 0 - 4 39 9 10 29 14.2 2 246 -1 - 4 3 32 - 5 14 51 - 3 55 29 - 5 22 57 0.33 - 65 0 0 - 4 11 11 10 29 13.9 1 245 0 - 3 35 36 - 4 46 50 - 3 27 34 - 4 54 55 0.44 - 64 0 0 - 3 43 24 10 29 13.8 0 245 1 .. .. .. - 4 19 1 .. .. .. - 4 27 5 2.86 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 327-160602 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 34 26.6938 DE: -24 36 25.761 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 34 26.6938 DE: -24 36 25.761 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.1 * 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]: 2.26970 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): 0.026", 0.006", 92.306° remarks: * orbital elements for (86)Semele : Mean anomaly = 266.2168833739 deg Arg. of pericenter = 308.9852272354 deg Long. of node = 86.0687319971 deg Inclination = 4.8220034220 deg Eccentricity = 0.2163093416 Semimajor axis = 3.1041467004 AU Perihelion dist = 2.4326907715 AU Mag: H = 8.77, G = 0.15 Epoch of elements : MJD 60124.44208333 TDT (2023 Jun 29.4421) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1192023Apr24,8.44,2023,6,29,10.612280,0.035529,-0.223237,-7.689735,-1.223856,-0.000049,0.000136,0.000001,0.000000 -157.4650,-24.5890,21.69,23.23,False UCAC4 327-160602,18.57408161,-24.6071557,0.00,11.06,0.00,0.0,4,,18.59833462,-24.5889789,2.34,0.00,0,0,0 86,Semele,13.26,116.4,2.2697,0,0,-2.184,-4.74,,5.8,0 0,266.1372,2023,6,29,308.9852,86.0687,4.8220,0.21631,3.10415,2.43269,8.80,5.0,0.15 1.113,0.0257,0.0063,92,0.0080,Known errors,-1.00,-1,-1,-1 20230629_160602,60063.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org