IOTA/IOTA-ES occultation update for (886) Washingtonia / UCAC4 285-137650 event on 2023 May 29, 08:57 UT Visible from South America Summary ------- On 2023 May 29 UT, the 90.8 km diameter asteroid (886) Washingtonia will occult a 11.7 mag star in the constellation Scorpius for observers along a path across South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.33 mag to 13.93 mag (the magnitude of the asteroid) for at most 7.300 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: 98 * date and approx. time of event: 2023 May 29, 08:49 - 2023 May 29, 09:06 * geocentric midpoint of event [JD]: 2460093.87347495 * magnitude of target star: 11.73 * magnitude drop [mag]: 2.33 * estimated maximum duration [s]: 7.300 * Moon: 67 % sunlit, 92° distance * Sun: 157° distance * rough path description: South America The occultation path -------------------- * approximate projected width [km]: 93 * 1 sigma uncertainty interval [path widths]: +/- 0.35 * 1 sigma uncertainty interval [seconds]: +/- 2.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.012) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.009", 108°) * approx speed of asteroid's shadow [km/s]: 12.4304 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 285-137650 by 886 Washingtonia on 2023 May 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 129 0 0 -34 28 41 9 6 7.8 0 131 -9 .. .. .. -35 2 13 .. .. .. -35 25 51 .... 130 0 0 -35 12 7 9 6 7.7 1 131 -10 -34 38 51 -35 45 28 -34 15 31 -36 8 59 0.27 131 0 0 -35 54 39 9 6 7.4 2 130 -11 -35 21 34 -36 27 49 -34 58 20 -36 51 12 0.24 132 0 0 -36 36 16 9 6 6.9 3 130 -12 -36 3 22 -37 9 15 -35 40 16 -37 32 31 0.23 133 0 0 -37 16 59 9 6 6.2 4 129 -13 -36 44 15 -37 49 47 -36 21 17 -38 12 55 0.23 134 0 0 -37 56 47 9 6 5.4 5 128 -14 -37 24 15 -38 29 24 -37 1 25 -38 52 24 0.22 135 0 0 -38 35 41 9 6 4.4 6 128 -15 -38 3 20 -39 8 7 -37 40 38 -39 30 59 0.22 136 0 0 -39 13 41 9 6 3.3 7 127 -16 -38 41 31 -39 45 56 -38 18 57 -40 8 40 0.22 137 0 0 -39 50 48 9 6 2.0 8 127 -17 -39 18 49 -40 22 51 -38 56 22 -40 45 27 0.22 138 0 0 -40 27 1 9 6 0.6 9 126 -18 -39 55 13 -40 58 53 -39 32 55 -41 21 21 0.22 139 0 0 -41 2 21 9 5 59.1 10 125 -18 -40 30 45 -41 34 2 -40 8 34 -41 56 21 0.22 140 0 0 -41 36 49 9 5 57.5 11 125 -19 -41 5 25 -42 8 18 -40 43 22 -42 30 30 0.22 141 0 0 -42 10 25 9 5 55.7 12 124 -20 -41 39 12 -42 41 43 -41 17 17 -43 3 47 0.22 142 0 0 -42 43 10 9 5 53.9 13 123 -21 -42 12 8 -43 14 17 -41 50 21 -43 36 13 0.22 143 0 0 -43 15 5 9 5 51.9 14 123 -22 -42 44 14 -43 46 0 -42 22 35 -44 7 48 0.22 144 0 0 -43 46 10 9 5 49.8 15 122 -23 -43 15 30 -44 16 54 -42 53 58 -44 38 33 0.22 145 0 0 -44 16 25 9 5 47.7 16 121 -23 -43 45 56 -44 46 58 -43 24 32 -45 8 30 0.22 146 0 0 -44 45 52 9 5 45.5 17 120 -24 -44 15 34 -45 16 14 -43 54 18 -45 37 38 0.22 147 0 0 -45 14 31 9 5 43.2 17 120 -25 -44 44 24 -45 44 42 -44 23 15 -46 5 58 0.22 148 0 0 -45 42 22 9 5 40.8 18 119 -26 -45 12 26 -46 12 23 -44 51 25 -46 33 32 0.22 149 0 0 -46 9 28 9 5 38.4 19 118 -26 -45 39 42 -46 39 18 -45 18 49 -47 0 19 0.22 150 0 0 -46 35 48 9 5 35.9 20 118 -27 -46 6 13 -47 5 27 -45 45 27 -47 26 21 0.22 151 0 0 -47 1 23 9 5 33.3 21 117 -28 -46 31 58 -47 30 52 -46 11 19 -47 51 38 0.22 152 0 0 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- 1 23 5 - 3 17 47 0.22 - 49 0 0 - 1 26 48 8 50 14.6 24 234 -6 - 0 53 19 - 2 0 24 - 0 29 48 - 2 24 5 0.22 - 48 0 0 - 0 33 45 8 50 9.8 23 234 -5 - 0 0 23 - 1 7 13 0 23 2 - 1 30 48 0.22 - 47 0 0 0 18 49 8 50 5.2 22 234 -3 0 52 3 - 0 14 30 1 15 23 - 0 37 59 0.22 - 46 0 0 1 10 54 8 50 0.9 20 234 -2 1 43 59 0 37 43 2 7 13 0 14 20 0.22 - 45 0 0 2 2 26 8 49 56.9 19 234 -1 2 35 23 1 29 24 2 58 30 1 6 6 0.22 - 44 0 0 2 53 24 8 49 53.1 18 234 0 3 26 12 2 20 31 3 49 13 1 57 20 0.22 - 43 0 0 3 43 45 8 49 49.6 16 234 1 4 16 24 3 11 2 4 39 19 2 47 57 0.22 - 42 0 0 4 33 30 8 49 46.4 15 234 3 5 5 59 4 0 55 5 28 47 3 37 58 0.23 - 41 0 0 5 22 35 8 49 43.5 14 234 4 5 54 55 4 50 10 6 17 36 4 27 19 0.23 - 40 0 0 6 10 59 8 49 40.8 13 234 5 6 43 9 5 38 44 7 5 44 5 16 0 0.23 - 39 0 0 6 58 42 8 49 38.4 11 234 6 7 30 42 6 26 37 7 53 10 6 4 0 0.23 - 38 0 0 7 45 41 8 49 36.3 10 234 7 8 17 31 7 13 46 8 39 52 6 51 17 0.24 - 37 0 0 8 31 56 8 49 34.4 9 234 9 9 3 36 8 0 11 9 25 50 7 37 49 0.24 - 36 0 0 9 17 25 8 49 32.8 8 234 10 9 48 55 8 45 51 10 11 2 8 23 36 0.25 - 35 0 0 10 2 9 8 49 31.4 6 235 11 10 33 28 9 30 45 10 55 27 9 8 37 0.25 - 34 0 0 10 46 5 8 49 30.3 5 235 12 11 17 14 10 14 51 11 39 6 9 52 51 0.26 - 33 0 0 11 29 13 8 49 29.4 4 235 13 12 0 11 10 58 10 12 21 56 10 36 17 0.28 - 32 0 0 12 11 32 8 49 28.7 3 235 15 12 42 20 11 40 40 13 3 58 11 18 54 0.31 - 31 0 0 12 53 2 8 49 28.3 2 235 16 13 23 40 12 22 20 13 45 10 12 0 42 0.39 - 30 0 0 13 33 43 8 49 28.2 0 236 17 14 4 10 13 3 11 .. .. .. 12 41 41 0.92 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 285-137650 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 52 29.6819 DE: -33 10 46.952 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 52 29.6819 DE: -33 10 46.952 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.7 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (886) Washingtonia asteroid class: approx. diameter [km]: 91 approx. diameter ["]: 0.060 distance from Earth [AU]: 2.10170 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): 0.027", 0.009", 107.561° remarks: * orbital elements for (886)Washingtonia : Mean anomaly = 292.5705994627 deg Arg. of pericenter = 302.3560377378 deg Long. of node = 58.8451171679 deg Inclination = 16.8732362137 deg Eccentricity = 0.2712037966 Semimajor axis = 3.1671343225 AU Perihelion dist = 2.3081954700 AU Mag: H = 9.40, G = 0.15 Epoch of elements : MJD 60093.37340278 TDT (2023 May 29.3734) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Apr24,7.30,2023,5,29,8.963399,0.109317,-0.194518,-6.116408,-3.437224,-0.001982,0.000914,0.000001,0.000000 -112.5720,-33.1853,44.90,21.60,False UCAC4 285-137650,17.87491163,-33.1797089,0.00,11.73,0.00,0.0,0,,17.90078064,-33.1852790,2.33,0.00,0,0,0 886,Washingtonia,13.93,90.8,2.1017,0,0,-2.039,-14.38,,4.6,0 0,292.5053,2023,5,29,302.3560,58.8451,16.8732,0.27120,3.16713,2.30820,9.35,5.0,0.15 1.352,0.0273,0.0093,108,0.0209,Known errors,-1.00,-1,-1,-1 20230529_137650,60063.19 ------ 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