IOTA/IOTA-ES occultation update for (1057) Wanda / UCAC4-337-156337 event on 2023 May 20, 14:33 UT Visible from N Australia Summary ------- On 2023 May 20 UT, the 43.7 km diameter asteroid (1057) Wanda will occult a 12.4 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 3.39 mag to 15.73 mag (the magnitude of the asteroid) for at most 7.540 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: 75 * date and approx. time of event: 2023 May 20, 14:14 - 2023 May 20, 14:52 * geocentric midpoint of event [JD]: 2460085.10659383 * magnitude of target star: 12.39 * magnitude drop [mag]: 3.39 * estimated maximum duration [s]: 7.540 * Moon: 1 % sunlit, 152° distance * Sun: 142° distance * rough path description: N Australia The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 0.75 * 1 sigma uncertainty interval [seconds]: +/- 10.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.041, +/- 0.020) * 1 sigma uncertainty ellipse (major, minor, PA): (0.041", 0.020", 84°) * approx speed of asteroid's shadow [km/s]: 5.7952 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-337-156337 by 1057 Wanda on 2023 May 20 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 89 0 0 2 54 45 14 51 45.1 0 113 -38 3 7 37 2 41 52 3 26 56 2 22 32 .... 90 0 0 2 29 28 14 51 44.8 1 113 -39 2 42 21 2 16 35 3 1 41 1 57 14 0.13 91 0 0 2 4 3 14 51 44.1 3 113 -41 2 16 57 1 51 10 2 36 18 1 31 47 0.10 92 0 0 1 38 30 14 51 42.9 4 113 -42 1 51 24 1 25 36 2 10 46 1 6 13 0.09 93 0 0 1 12 49 14 51 41.4 5 113 -43 1 25 44 0 59 55 1 45 7 0 40 31 0.08 94 0 0 0 47 2 14 51 39.5 6 113 -44 0 59 57 0 34 7 1 19 21 0 14 42 0.08 95 0 0 0 21 8 14 51 37.2 7 113 -45 0 34 4 0 8 13 0 53 28 - 0 11 12 0.08 96 0 0 - 0 4 51 14 51 34.6 8 113 -46 0 8 5 - 0 17 47 0 27 30 - 0 37 12 0.08 97 0 0 - 0 30 55 14 51 31.5 9 113 -47 - 0 17 58 - 0 43 51 0 1 27 - 1 3 17 0.07 98 0 0 - 0 57 3 14 51 28.1 10 113 -48 - 0 44 6 - 1 10 0 - 0 24 40 - 1 29 26 0.07 99 0 0 - 1 23 14 14 51 24.2 11 113 -49 - 1 10 17 - 1 36 12 - 0 50 51 - 1 55 39 0.07 100 0 0 - 1 49 29 14 51 20.0 12 113 -50 - 1 36 32 - 2 2 27 - 1 17 5 - 2 21 54 0.07 101 0 0 - 2 15 46 14 51 15.4 13 113 -51 - 2 2 49 - 2 28 44 - 1 43 22 - 2 48 11 0.07 102 0 0 - 2 42 5 14 51 10.5 14 113 -52 - 2 29 7 - 2 55 2 - 2 9 40 - 3 14 30 0.07 103 0 0 - 3 8 24 14 51 5.2 15 113 -53 - 2 55 27 - 3 21 22 - 2 35 59 - 3 40 50 0.07 104 0 0 - 3 34 44 14 50 59.5 17 113 -54 - 3 21 46 - 3 47 42 - 3 2 19 - 4 7 10 0.07 105 0 0 - 4 1 4 14 50 53.5 18 112 -55 - 3 48 6 - 4 14 2 - 3 28 39 - 4 33 30 0.07 106 0 0 - 4 27 23 14 50 47.1 19 112 -57 - 4 14 25 - 4 40 21 - 3 54 58 - 4 59 49 0.07 107 0 0 - 4 53 40 14 50 40.4 20 112 -58 - 4 40 42 - 5 6 38 - 4 21 15 - 5 26 6 0.07 108 0 0 - 5 19 55 14 50 33.3 21 112 -59 - 5 6 58 - 5 32 53 - 4 47 31 - 5 52 21 0.07 109 0 0 - 5 46 8 14 50 25.9 22 112 -60 - 5 33 10 - 5 59 5 - 5 13 44 - 6 18 33 0.07 110 0 0 - 6 12 17 14 50 18.1 23 112 -61 - 5 59 20 - 6 25 14 - 5 39 53 - 6 44 42 0.07 111 0 0 - 6 38 22 14 50 10.1 24 112 -62 - 6 25 25 - 6 51 19 - 6 5 59 - 7 10 47 0.07 112 0 0 - 7 4 23 14 50 1.7 25 112 -63 - 6 51 26 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37 -22 51 50 0.08 -103 0 0 -22 3 10 14 16 58.3 25 254 12 -21 50 43 -22 15 38 -21 32 2 -22 34 20 0.08 -102 0 0 -21 45 17 14 16 50.7 24 254 12 -21 32 49 -21 57 46 -21 14 6 -22 16 30 0.08 -101 0 0 -21 27 4 14 16 43.3 23 254 13 -21 14 34 -21 39 33 -20 55 49 -21 58 19 0.08 -100 0 0 -21 8 30 14 16 36.2 22 253 14 -20 55 59 -21 21 1 -20 37 13 -21 39 49 0.08 - 99 0 0 -20 49 36 14 16 29.3 21 253 15 -20 37 4 -21 2 8 -20 18 16 -21 20 58 0.08 - 98 0 0 -20 30 23 14 16 22.7 20 253 16 -20 17 49 -20 42 56 -19 58 59 -21 1 47 0.08 - 97 0 0 -20 10 49 14 16 16.3 19 252 17 -19 58 15 -20 23 23 -19 39 23 -20 42 16 0.08 - 96 0 0 -19 50 55 14 16 10.3 18 252 18 -19 38 20 -20 3 31 -19 19 26 -20 22 26 0.08 - 95 0 0 -19 30 43 14 16 4.5 17 252 19 -19 18 6 -19 43 19 -18 59 10 -20 2 16 0.08 - 94 0 0 -19 10 10 14 15 58.9 16 251 20 -18 57 32 -19 22 48 -18 38 35 -19 41 47 0.08 - 93 0 0 -18 49 19 14 15 53.7 15 251 21 -18 36 40 -19 1 58 -18 17 41 -19 20 58 0.08 - 92 0 0 -18 28 8 14 15 48.8 14 251 22 -18 15 28 -18 40 48 -17 56 27 -18 59 50 0.08 - 91 0 0 -18 6 39 14 15 44.1 13 250 23 -17 53 57 -18 19 20 -17 34 55 -18 38 24 0.08 - 90 0 0 -17 44 51 14 15 39.8 12 250 24 -17 32 8 -17 57 34 -17 13 4 -18 16 39 0.08 - 89 0 0 -17 22 45 14 15 35.8 11 250 25 -17 10 1 -17 35 28 -16 50 55 -17 54 35 0.08 - 88 0 0 -17 0 20 14 15 32.1 10 249 26 -16 47 36 -17 13 5 -16 28 28 -17 32 14 0.08 - 87 0 0 -16 37 38 14 15 28.7 9 249 27 -16 24 52 -16 50 24 -16 5 43 -17 9 35 0.08 - 86 0 0 -16 14 39 14 15 25.6 8 249 28 -16 1 52 -16 27 26 -15 42 41 -16 46 38 0.09 - 85 0 0 -15 51 22 14 15 22.9 7 249 29 -15 38 34 -16 4 10 -15 19 21 -16 23 24 0.09 - 84 0 0 -15 27 48 14 15 20.5 6 248 30 -15 14 59 -15 40 38 -14 55 45 -15 59 53 0.09 - 83 0 0 -15 3 58 14 15 18.5 5 248 31 -14 51 8 -15 16 48 -14 31 52 -15 36 5 0.10 - 82 0 0 -14 39 52 14 15 16.8 4 248 32 -14 27 0 -14 52 43 -14 7 43 -15 12 2 0.10 - 81 0 0 -14 15 30 14 15 15.5 3 247 33 -14 2 37 -14 28 22 -13 43 18 -14 47 42 0.12 - 80 0 0 -13 50 52 14 15 14.6 2 247 34 -13 37 59 -14 3 46 -13 18 38 -14 23 7 0.14 - 79 0 0 -13 26 0 14 15 14.0 1 247 35 -13 13 6 -13 38 54 -12 53 44 -13 58 17 0.22 - 78 0 0 -13 0 53 14 15 13.8 0 247 36 .. .. .. -13 13 48 .. .. .. -13 33 13 9.82 Uncertainty in time = +/- 11 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4-337-156337 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 31 52.4646 DE: -22 36 39.599 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 31 52.4646 DE: -22 36 39.599 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1057) Wanda asteroid class: approx. diameter [km]: 44 approx. diameter ["]: 0.029 distance from Earth [AU]: 2.07470 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): 0.041", 0.020", 83.676° remarks: * orbital elements for (1057)Wanda : Mean anomaly = 280.6576207766 deg Arg. of pericenter = 114.8807807850 deg Long. of node = 257.8411228515 deg Inclination = 3.5417813390 deg Eccentricity = 0.2475386024 Semimajor axis = 2.8924795333 AU Perihelion dist = 2.1764791922 AU Mag: H = 11.05, G = 0.15 Epoch of elements : MJD 60084.60652778 TDT (2023 May 20.6065) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,7.54,2023,5,20,14.558252,-0.014032,-0.092326,-3.233696,0.492254,-0.003507,-0.000253,0.000001,0.000000 -178.0418,-22.5945,-39.23,20.01,False UCAC4-337-156337,18.53124015,-22.6109998,0.00,12.39,0.00,0.0,0,,18.55490529,-22.5945277,3.39,0.00,0,0,0 1057,Wanda,15.73,43.7,2.0747,0,0,-0.990,2.09,,2.2,0 0,280.5361,2023,5,20,114.8808,257.8411,3.5418,0.24754,2.89248,2.17648,11.07,5.0,0.15 1.751,0.0413,0.0197,84,0.0218,Known errors,-1.00,-1,-1,-1 20230520_156337,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org