IOTA/IOTA-ES occultation update for (886) Washingtonia / UCAC4-297-148565 event on 2023 May 04, 17:24 UT Visible from Australia Summary ------- On 2023 May 04 UT, the 90.8 km diameter asteroid (886) Washingtonia will occult a 12.3 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.33 mag to 14.48 mag (the magnitude of the asteroid) for at most 11.880 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: 94 * date and approx. time of event: 2023 May 04, 17:10 - 2023 May 04, 17:38 * geocentric midpoint of event [JD]: 2460069.22517359 * magnitude of target star: 12.28 * magnitude drop [mag]: 2.33 * estimated maximum duration [s]: 11.880 * Moon: 99 % sunlit, 59° distance * Sun: 132° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 93 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.023, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.024", 0.008", 105°) * approx speed of asteroid's shadow [km/s]: 7.6461 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-297-148565 by 886 Washingtonia on 2023 May 4 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 21 0 0 -43 29 45 17 37 46.3 0 134 -23 .. .. .. -44 5 10 .. .. .. -44 36 46 .... 22 0 0 -44 11 38 17 37 46.1 1 134 -23 -43 36 39 -44 46 29 -43 5 13 -45 17 35 -0.04 23 0 0 -44 51 41 17 37 45.7 2 133 -24 -44 17 16 -45 25 59 -43 46 19 -45 56 36 -0.15 24 0 0 -45 29 59 17 37 45.1 3 132 -25 -44 56 5 -46 3 46 -44 25 37 -46 33 55 -0.18 25 0 0 -46 6 37 17 37 44.2 4 132 -25 -45 33 13 -46 39 54 -45 3 12 -47 9 37 -0.20 26 0 0 -46 41 39 17 37 43.1 5 131 -26 -46 8 43 -47 14 28 -45 39 8 -47 43 46 -0.21 27 0 0 -47 15 10 17 37 41.9 6 130 -27 -46 42 42 -47 47 32 -46 13 31 -48 16 26 -0.22 28 0 0 -47 47 14 17 37 40.5 7 129 -27 -47 15 12 -48 19 11 -46 46 25 -48 47 42 -0.23 29 0 0 -48 17 55 17 37 38.9 7 129 -28 -47 46 17 -48 49 27 -47 17 52 -49 17 37 -0.23 30 0 0 -48 47 16 17 37 37.2 8 128 -28 -48 16 2 -49 18 25 -47 47 59 -49 46 14 -0.23 31 0 0 -49 15 21 17 37 35.4 9 127 -29 -48 44 29 -49 46 8 -48 16 46 -50 13 37 -0.23 32 0 0 -49 42 13 17 37 33.5 10 127 -30 -49 11 42 -50 12 38 -48 44 19 -50 39 48 -0.23 33 0 0 -50 7 54 17 37 31.4 11 126 -30 -49 37 44 -50 37 59 -49 10 39 -51 4 51 -0.24 34 0 0 -50 32 28 17 37 29.3 11 125 -31 -50 2 37 -51 2 14 -49 35 50 -51 28 49 -0.24 35 0 0 -50 55 57 17 37 27.0 12 124 -31 -50 26 25 -51 25 24 -49 59 54 -51 51 43 -0.24 36 0 0 -51 18 23 17 37 24.6 13 123 -32 -50 49 9 -51 47 33 -50 22 54 -52 13 36 -0.24 37 0 0 -51 39 49 17 37 22.2 14 123 -32 -51 10 52 -52 8 42 -50 44 52 -52 34 31 -0.24 38 0 0 -52 0 17 17 37 19.7 14 122 -33 -51 31 36 -52 28 54 -51 5 51 -52 54 29 -0.24 39 0 0 -52 19 49 17 37 17.0 15 121 -33 -51 51 23 -52 48 11 -51 25 52 -53 13 32 -0.24 40 0 0 -52 38 27 17 37 14.4 16 120 -34 -52 10 16 -53 6 35 -51 44 58 -53 31 42 -0.24 41 0 0 -52 56 12 17 37 11.6 16 120 -34 -52 28 15 -53 24 6 -52 3 9 -53 49 2 -0.24 42 0 0 -53 13 7 17 37 8.8 17 119 -35 -52 45 23 -53 40 47 -52 20 29 -54 5 31 -0.24 43 0 0 -53 29 12 17 37 5.9 18 118 -35 -53 1 40 -53 56 40 -52 36 58 -54 21 13 -0.24 44 0 0 -53 44 30 17 37 2.9 18 117 -36 -53 17 10 -54 11 46 -52 52 38 -54 36 8 -0.24 45 0 0 -53 59 1 17 36 59.9 19 117 -36 -53 31 52 -54 26 6 -53 7 31 -54 50 18 -0.24 46 0 0 -54 12 47 17 36 56.9 19 116 -36 -53 45 49 -54 39 41 -53 21 37 -55 3 44 -0.24 47 0 0 -54 25 49 17 36 53.7 20 115 -37 -53 59 1 -54 52 33 -53 34 58 -55 16 27 -0.24 48 0 0 -54 38 8 17 36 50.6 21 114 -37 -54 11 30 -55 4 43 -53 47 36 -55 28 28 -0.24 49 0 0 -54 49 45 17 36 47.3 21 113 -38 -54 23 16 -55 16 11 -53 59 30 -55 39 49 -0.24 50 0 0 -55 0 42 17 36 44.0 22 113 -38 -54 34 22 -55 27 0 -54 10 43 -55 50 30 -0.24 51 0 0 -55 10 59 17 36 40.7 22 112 -38 -54 44 47 -55 37 9 -54 21 16 -56 0 32 -0.24 52 0 0 -55 20 37 17 36 37.3 23 111 -39 -54 54 32 -55 46 39 -54 31 8 -56 9 56 -0.24 53 0 0 -55 29 37 17 36 33.8 24 110 -39 -55 3 39 -55 55 32 -54 40 21 -56 18 43 -0.24 54 0 0 -55 37 59 17 36 30.4 24 110 -40 -55 12 8 -56 3 48 -54 48 56 -56 26 53 -0.24 55 0 0 -55 45 45 17 36 26.8 25 109 -40 -55 19 59 -56 11 28 -54 56 53 -56 34 27 -0.23 56 0 0 -55 52 55 17 36 23.2 25 108 -40 -55 27 14 -56 18 32 -55 4 13 -56 41 26 -0.23 57 0 0 -55 59 29 17 36 19.6 26 107 -41 -55 33 54 -56 25 1 -55 10 56 -56 47 50 -0.23 58 0 0 -56 5 27 17 36 15.9 26 106 -41 -55 39 57 -56 30 55 -55 17 4 -56 53 41 -0.23 59 0 0 -56 10 52 17 36 12.1 27 106 -41 -55 45 26 -56 36 15 -55 22 37 -56 58 57 -0.23 60 0 0 -56 15 42 17 36 8.3 28 105 -42 -55 50 20 -56 41 2 -55 27 34 -57 3 40 -0.23 61 0 0 -56 19 59 17 36 4.5 28 104 -42 -55 54 40 -56 45 15 -55 31 57 -57 7 50 -0.23 62 0 0 -56 23 42 17 36 0.5 29 103 -42 -55 58 26 -56 48 55 -55 35 46 -57 11 28 -0.23 63 0 0 -56 26 52 17 35 56.6 29 102 -43 -56 1 38 -56 52 3 -55 39 1 -57 14 33 -0.23 64 0 0 -56 29 29 17 35 52.6 30 102 -43 -56 4 18 -56 54 38 -55 41 42 -57 17 7 -0.23 65 0 0 -56 31 34 17 35 48.5 30 101 -44 -56 6 24 -56 56 41 -55 43 50 -57 19 8 -0.23 66 0 0 -56 33 6 17 35 44.4 31 100 -44 -56 7 58 -56 58 12 -55 45 24 -57 20 38 -0.23 67 0 0 -56 34 6 17 35 40.2 31 99 -44 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29 28 -55 15 44 -56 52 12 -0.23 80 0 0 -55 57 58 17 34 39.4 38 90 -48 -55 32 25 -56 23 27 -55 9 31 -56 46 15 -0.23 81 0 0 -55 51 18 17 34 34.2 39 89 -49 -55 25 41 -56 16 52 -55 2 43 -56 39 44 -0.23 82 0 0 -55 44 4 17 34 28.9 39 88 -49 -55 18 21 -56 9 43 -54 55 18 -56 32 39 -0.23 83 0 0 -55 36 14 17 34 23.4 40 87 -49 -55 10 26 -56 1 59 -54 47 18 -56 25 0 -0.23 84 0 0 -55 27 48 17 34 17.9 41 87 -50 -55 1 54 -55 53 39 -54 38 40 -56 16 45 -0.23 85 0 0 -55 18 45 17 34 12.3 41 86 -50 -54 52 45 -55 44 43 -54 29 26 -56 7 55 -0.23 86 0 0 -55 9 6 17 34 6.5 42 85 -50 -54 42 59 -55 35 10 -54 19 33 -55 58 28 -0.23 87 0 0 -54 58 48 17 34 0.7 42 85 -51 -54 32 34 -55 25 0 -54 9 1 -55 48 25 -0.22 88 0 0 -54 47 52 17 33 54.7 43 84 -51 -54 21 30 -55 14 11 -53 57 50 -55 37 43 -0.22 89 0 0 -54 36 16 17 33 48.6 43 83 -51 -54 9 46 -55 2 44 -53 45 59 -55 26 23 -0.22 90 0 0 -54 24 0 17 33 42.4 44 83 -51 -53 57 21 -54 50 37 -53 33 26 -55 14 24 -0.22 91 0 0 -54 11 3 17 33 36.0 45 82 -52 -53 44 14 -54 37 49 -53 20 11 -55 1 44 -0.22 92 0 0 -53 57 24 17 33 29.5 45 81 -52 -53 30 25 -54 24 19 -53 6 14 -54 48 23 -0.22 93 0 0 -53 43 1 17 33 22.9 46 81 -52 -53 15 53 -54 10 7 -52 51 32 -54 34 20 -0.22 94 0 0 -53 27 54 17 33 16.1 46 80 -53 -53 0 35 -53 55 11 -52 36 4 -54 19 34 -0.22 95 0 0 -53 12 2 17 33 9.1 47 80 -53 -52 44 31 -53 39 30 -52 19 50 -54 4 3 -0.22 96 0 0 -52 55 23 17 33 2.0 48 79 -53 -52 27 41 -53 23 3 -52 2 49 -53 47 46 -0.22 97 0 0 -52 37 56 17 32 54.8 48 78 -53 -52 10 1 -53 5 48 -51 44 59 -53 30 43 -0.22 98 0 0 -52 19 40 17 32 47.3 49 78 -54 -51 51 32 -52 47 45 -51 26 18 -53 12 51 -0.22 99 0 0 -52 0 33 17 32 39.7 50 77 -54 -51 32 12 -52 28 51 -51 6 45 -52 54 9 -0.22 100 0 0 -51 40 34 17 32 31.8 50 77 -54 -51 11 58 -52 9 6 -50 46 19 -52 34 37 -0.22 101 0 0 -51 19 41 17 32 23.8 51 76 -55 -50 50 50 -51 48 28 -50 24 58 -52 14 11 -0.22 102 0 0 -50 57 52 17 32 15.5 52 76 -55 -50 28 46 -51 26 54 -50 2 39 -51 52 52 -0.22 103 0 0 -50 35 5 17 32 7.1 52 75 -55 -50 5 44 -51 4 24 -49 39 23 -51 30 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Uncertainty in time = +/- 5 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4-297-148565 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 05 21.9515 DE: -30 43 37.521 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 05 21.9515 DE: -30 43 37.521 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.900,0.700) * V mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (886) Washingtonia asteroid class: approx. diameter [km]: 91 approx. diameter ["]: 0.053 distance from Earth [AU]: 2.35940 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#59 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): 0.024", 0.008", 105.175° remarks: * orbital elements for (886)Washingtonia : Mean anomaly = 288.2651497227 deg Arg. of pericenter = 302.3514892378 deg Long. of node = 58.8449709363 deg Inclination = 16.8731284592 deg Eccentricity = 0.2712033857 Semimajor axis = 3.1672065095 AU Perihelion dist = 2.3082493809 AU Mag: H = 9.40, G = 0.15 Epoch of elements : MJD 60068.72520833 TDT (2023 May 04.7252) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Apr24,11.88,2023,5,4,17.404166,-0.205584,0.091989,-1.761875,-3.939620,-0.004199,0.000439,0.000001,0.000000 148.3181,-30.7252,-81.86,16.04,False UCAC4-297-148565,18.08943097,-30.7270893,0.00,12.28,0.00,0.0,4,,18.11457377,-30.7252128,2.34,0.00,0,0,0 886,Washingtonia,14.48,90.8,2.3594,0,0,-0.510,-14.68,,4.6,0 0,288.1383,2023,5,4,302.3515,58.8450,16.8731,0.27120,3.16721,2.30825,9.35,5.0,0.15 1.448,0.0240,0.0084,105,0.0238,Known errors,-1.00,-1,-1,-1 20230504_148565,60063.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:21 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org