IOTA/IOTA-ES occultation update for (1057) Wanda / UCAC4 338-151624 event on 2023 May 28, 23:53 UT Visible from S Africa Summary ------- On 2023 May 28 UT, the 43.7 km diameter asteroid (1057) Wanda will occult a 12.1 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 3.50 mag to 15.53 mag (the magnitude of the asteroid) for at most 5.280 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: 77 * date and approx. time of event: 2023 May 28, 23:40 - 2023 May 29, 00:06 * geocentric midpoint of event [JD]: 2460093.49552708 * magnitude of target star: 12.07 * magnitude drop [mag]: 3.50 * estimated maximum duration [s]: 5.280 * Moon: 62 % sunlit, 105° distance * Sun: 151° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 45 * 1 sigma uncertainty interval [path widths]: +/- 0.72 * 1 sigma uncertainty interval [seconds]: +/- 7.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.043, +/- 0.021) * 1 sigma uncertainty ellipse (major, minor, PA): (0.043", 0.020", 84°) * approx speed of asteroid's shadow [km/s]: 8.2780 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 338-151624 by 1057 Wanda on 2023 May 28 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 - 63 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. - 6 13 8 .... - 62 0 0 - 6 6 23 0 6 7.9 + 1 113 -30 - 5 53 19 - 6 19 27 - 5 34 37 - 6 38 12 .... - 61 0 0 - 6 31 32 0 6 7.6 + 2 112 -31 - 6 18 28 - 6 44 37 - 5 59 45 - 7 3 23 0.20 - 60 0 0 - 6 56 47 0 6 6.9 + 3 112 -32 - 6 43 42 - 7 9 52 - 6 24 58 - 7 28 38 0.20 - 59 0 0 - 7 22 5 0 6 5.9 + 4 112 -33 - 7 9 0 - 7 35 11 - 6 50 16 - 7 53 58 0.19 - 58 0 0 - 7 47 27 0 6 4.7 + 5 112 -35 - 7 34 22 - 8 0 34 - 7 15 37 - 8 19 21 0.19 - 57 0 0 - 8 12 53 0 6 3.2 + 6 112 -36 - 7 59 47 - 8 25 59 - 7 41 2 - 8 44 47 0.19 - 56 0 0 - 8 38 21 0 6 1.5 + 7 112 -37 - 8 25 15 - 8 51 28 - 8 6 29 - 9 10 16 0.19 - 55 0 0 - 9 3 51 0 5 59.5 + 8 112 -38 - 8 50 44 - 9 16 58 - 8 31 59 - 9 35 47 0.19 - 54 0 0 - 9 29 22 0 5 57.2 + 10 111 -39 - 9 16 15 - 9 42 29 - 8 57 29 -10 1 18 0.19 - 53 0 0 - 9 54 54 0 5 54.6 + 11 111 -40 - 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-16 50 37 -17 54 22 0.25 130 0 0 -16 57 48 23 40 59.9 3 247 25 -16 44 42 -17 10 55 -16 25 56 -17 29 44 0.28 131 0 0 -16 32 58 23 40 59.4 2 247 26 -16 19 51 -16 46 5 -16 1 4 -17 4 55 0.34 132 0 0 -16 7 58 23 40 59.1 1 247 27 -15 54 50 -16 21 6 -15 36 3 -16 39 56 0.63 Uncertainty in time = +/- 8 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 338-151624 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 27 42.5927 DE: -22 29 43.712 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 27 42.5927 DE: -22 29 43.712 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.1 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1057) Wanda asteroid class: approx. diameter [km]: 44 approx. diameter ["]: 0.030 distance from Earth [AU]: 1.98940 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 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): 0.043", 0.020", 84.08° remarks: * orbital elements for (1057)Wanda : Mean anomaly = 282.3369300236 deg Arg. of pericenter = 114.8823416499 deg Long. of node = 257.8411624498 deg Inclination = 3.5417987729 deg Eccentricity = 0.2475405125 Semimajor axis = 2.8924600991 AU Perihelion dist = 2.1764590438 AU Mag: H = 11.05, G = 0.15 Epoch of elements : MJD 60092.99548611 TDT (2023 May 28.9955) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,5.28,2023,5,28,23.892650,-0.019289,-0.201159,-4.650891,0.447144,-0.002715,-0.000207,0.000001,0.000000 32.6333,-22.4813,-179.05,21.54,False UCAC4 338-151624,18.46183129,-22.4954755,0.00,12.07,0.00,0.0,0,,18.48555203,-22.4813404,3.50,0.00,0,0,0 1057,Wanda,15.53,43.7,1.9894,0,0,-1.484,1.98,,2.2,0 0,282.1375,2023,5,28,114.8823,257.8412,3.5418,0.24754,2.89246,2.17646,11.07,5.0,0.15 1.716,0.0433,0.0203,84,0.0217,Known errors,-1.00,-1,-1,-1 20230528_151624,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org