IOTA/IOTA-ES occultation update for (1057) Wanda / UCAC4 344-113806 event on 2023 Sep 12, 20:20 UT Visible from S Africa Summary ------- On 2023 Sep 12 UT, the 43.7 km diameter asteroid (1057) Wanda will occult a 11.0 mag star in the constellation Sagittarius for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.06 mag to 16.05 mag (the magnitude of the asteroid) for at most 3.600 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 12, 20:11 - 2023 Sep 12, 20:29 * geocentric midpoint of event [JD]: 2460200.34744067 * magnitude of target star: 11.00 * magnitude drop [mag]: 5.06 * estimated maximum duration [s]: 3.600 * Moon: 5 % sunlit, 122° distance * Sun: 97° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 45 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.001) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.000", 87°) * approx speed of asteroid's shadow [km/s]: 12.1258 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 344-113806 by 1057 Wanda on 2023 Sep 12 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 -122 0 0 -12 38 10 20 11 47.9 0 112 73 -12 51 22 -12 24 59 -12 52 3 -12 24 18 .... -121 0 0 -13 1 51 20 11 48.1 2 112 73 -13 15 3 -12 48 39 -13 15 44 -12 47 58 0.26 -120 0 0 -13 25 32 20 11 48.4 3 111 72 -13 38 45 -13 12 21 -13 39 26 -13 11 40 0.26 -119 0 0 -13 49 15 20 11 49.0 4 111 72 -14 2 27 -13 36 3 -14 3 8 -13 35 22 0.26 -118 0 0 -14 12 57 20 11 49.7 5 111 71 -14 26 10 -13 59 45 -14 26 51 -13 59 4 0.26 -117 0 0 -14 36 38 20 11 50.6 6 111 70 -14 49 51 -14 23 26 -14 50 32 -14 22 45 0.26 -116 0 0 -15 0 19 20 11 51.7 7 110 69 -15 13 32 -14 47 6 -15 14 13 -14 46 25 0.26 -115 0 0 -15 23 57 20 11 52.9 8 110 69 -15 37 10 -15 10 45 -15 37 51 -15 10 4 0.26 -114 0 0 -15 47 33 20 11 54.4 9 110 68 -16 0 46 -15 34 21 -16 1 27 -15 33 40 0.26 -113 0 0 -16 11 6 20 11 56.0 10 109 67 -16 24 19 -15 57 54 -16 25 0 -15 57 13 0.26 -112 0 0 -16 34 35 20 11 57.8 11 109 66 -16 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0.30 58 0 0 -15 19 32 20 28 47.1 6 249 -77 -15 32 45 -15 6 20 -15 33 26 -15 5 39 0.31 59 0 0 -14 55 56 20 28 48.0 5 249 -77 -15 9 9 -14 42 44 -15 9 50 -14 42 3 0.32 60 0 0 -14 32 17 20 28 48.7 4 249 -77 -14 45 30 -14 19 5 -14 46 11 -14 18 24 0.33 61 0 0 -14 8 37 20 28 49.2 3 249 -76 -14 21 50 -13 55 26 -14 22 31 -13 54 45 0.37 62 0 0 -13 44 57 20 28 49.6 1 248 -76 -13 58 10 -13 31 46 -13 58 51 -13 31 5 0.44 63 0 0 -13 21 17 20 28 49.8 0 248 -76 -13 34 30 -13 8 6 -13 35 11 -13 7 25 0.88 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 344-113806 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 46 34.8351 DE: -21 18 21.921 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 46 34.8350 DE: -21 18 21.921 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1057) Wanda asteroid class: approx. diameter [km]: 44 approx. diameter ["]: 0.026 distance from Earth [AU]: 2.31720 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 date of fit: 2023 Aug 21 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): 0.008", 0.000", 86.533° remarks: * orbital elements for (1057)Wanda : Mean anomaly = 303.7230151298 deg Arg. of pericenter = 114.9085992159 deg Long. of node = 257.8426647417 deg Inclination = 3.5420743093 deg Eccentricity = 0.2475596995 Semimajor axis = 2.8921305437 AU Perihelion dist = 2.1761555755 AU Mag: H = 11.04, G = 0.15 Epoch of elements : MJD 60199.84743056 TDT (2023 Sep 12.8474) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Aug21,3.60,2023,9,12,20.338576,-0.001638,-0.236739,6.843995,-0.046466,0.005596,-0.000146,0.000000,0.000000 -29.6592,-21.3156,-126.01,4.03,False UCAC4 344-113806,17.77634310,-21.3060893,0.00,11.00,0.00,0.0,0,,17.79991320,-21.3155881,5.06,0.00,0,0,0 1057,Wanda,16.05,43.700,2.3172,0,0,1.859,-0.18,,2.2,0 0,303.5532,2023,9,12,114.9086,257.8427,3.5421,0.24756,2.89213,2.17616,11.05,5.0,0.15 1.026,0.0080,0.0004,87,0.0080,Known errors,-1.00,0,-1,-1 20230912_113806,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org