IOTA/IOTA-ES occultation update for (886) Washingtonia / UCAC4 272-102519 event on 2023 Jul 06, 00:05 UT Visible from Africa, South America Summary ------- On 2023 Jul 06 UT, the 90.8 km diameter asteroid (886) Washingtonia will occult a 11.0 mag star in the constellation Scorpius for observers along a path across Africa, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.89 mag to 13.81 mag (the magnitude of the asteroid) for at most 7.890 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: 99 * date and approx. time of event: 2023 Jul 05, 23:56 - 2023 Jul 06, 00:14 * geocentric midpoint of event [JD]: 2460131.50382966 * magnitude of target star: 11.00 * magnitude drop [mag]: 2.89 * estimated maximum duration [s]: 7.890 * Moon: 90 % sunlit, 58° distance * Sun: 154° distance * rough path description: Africa, South America The occultation path -------------------- * approximate projected width [km]: 92 * 1 sigma uncertainty interval [path widths]: +/- 0.28 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.015) * 1 sigma uncertainty ellipse (major, minor, PA): (0.028", 0.009", 115°) * approx speed of asteroid's shadow [km/s]: 11.5073 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 272-102519 by 886 Washingtonia on 2023 Jul 6 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 -128 0 0 -13 31 50 0 14 40.5 0 127 26 .. .. .. -14 2 48 .. .. .. -14 20 22 .... -127 0 0 -14 15 40 0 14 40.3 1 127 24 -13 44 47 -14 46 35 -13 27 17 -15 4 7 0.20 -126 0 0 -14 59 10 0 14 39.9 2 126 23 -14 28 20 -15 30 2 -14 10 52 -15 47 33 0.15 -125 0 0 -15 42 19 0 14 39.3 4 126 22 -15 11 33 -16 13 8 -14 54 7 -16 30 37 0.14 -124 0 0 -16 25 6 0 14 38.4 5 126 21 -15 54 23 -16 55 51 -15 36 59 -17 13 18 0.13 -123 0 0 -17 7 29 0 14 37.3 6 126 20 -16 36 50 -17 38 11 -16 19 28 -17 55 36 0.13 -122 0 0 -17 49 28 0 14 35.9 7 125 18 -17 18 53 -18 20 5 -17 1 33 -18 37 28 0.12 -121 0 0 -18 31 0 0 14 34.3 8 125 17 -18 0 29 -19 1 34 -17 43 12 -19 18 54 0.12 -120 0 0 -19 12 6 0 14 32.6 10 125 16 -18 41 39 -19 42 35 -18 24 25 -19 59 52 0.12 -119 0 0 -19 52 44 0 14 30.6 11 124 15 -19 22 22 -20 23 8 -19 5 10 -20 40 23 0.12 -118 0 0 -20 32 52 0 14 28.4 12 124 14 -20 2 35 -21 3 11 -19 45 26 -21 20 23 0.12 -117 0 0 -21 12 30 0 14 26.0 13 124 13 -20 42 18 -21 42 44 -20 25 12 -21 59 54 0.12 -116 0 0 -21 51 38 0 14 23.4 14 123 12 -21 21 31 -22 21 47 -21 4 28 -22 38 53 0.12 -115 0 0 -22 30 14 0 14 20.6 15 123 10 -22 0 13 -23 0 18 -21 43 13 -23 17 21 0.12 -114 0 0 -23 8 18 0 14 17.6 16 122 9 -22 38 22 -23 38 16 -22 21 25 -23 55 16 0.12 -113 0 0 -23 45 49 0 14 14.5 17 122 8 -23 15 59 -24 15 41 -22 59 5 -24 32 38 0.12 -112 0 0 -24 22 47 0 14 11.2 19 122 7 -23 53 2 -24 52 33 -23 36 12 -25 9 27 0.12 -111 0 0 -24 59 10 0 14 7.7 20 121 6 -24 29 32 -25 28 51 -24 12 45 -25 45 41 0.12 -110 0 0 -25 34 59 0 14 4.1 21 121 5 -25 5 27 -26 4 34 -24 48 43 -26 21 20 0.12 -109 0 0 -26 10 13 0 14 0.4 22 120 4 -25 40 47 -26 39 41 -25 24 7 -26 56 25 0.12 -108 0 0 -26 44 52 0 13 56.5 23 120 3 -26 15 32 -27 14 14 -25 58 55 -27 30 54 0.12 -107 0 0 -27 18 55 0 13 52.4 24 119 2 -26 49 42 -27 48 11 -26 33 8 -28 4 47 0.12 -106 0 0 -27 52 23 0 13 48.2 25 119 1 -27 23 15 -28 21 32 -27 6 46 -28 38 5 0.12 -105 0 0 -28 25 14 0 13 43.9 26 118 0 -27 56 13 -28 54 17 -27 39 47 -29 10 46 0.12 -104 0 0 -28 57 29 0 13 39.5 27 118 -1 -28 28 34 -29 26 25 -28 12 12 -29 42 51 0.12 -103 0 0 -29 29 7 0 13 35.0 28 117 -2 -29 0 19 -29 57 57 -28 44 1 -30 14 19 0.12 -102 0 0 -30 0 9 0 13 30.4 29 117 -3 -29 31 28 -30 28 53 -29 15 13 -30 45 11 0.12 -101 0 0 -30 30 35 0 13 25.6 30 116 -4 -30 2 0 -30 59 12 -29 45 49 -31 15 26 0.12 -100 0 0 -31 0 24 0 13 20.8 31 116 -5 -30 31 55 -31 28 54 -30 15 48 -31 45 5 0.12 - 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26 237 -49 -13 46 34 -14 47 57 -13 29 12 -15 5 22 0.12 45 0 0 -13 34 19 23 57 13.4 - 25 237 -48 -13 3 36 -14 5 3 -12 46 13 -14 22 30 0.12 46 0 0 -12 51 6 23 57 8.6 - 24 236 -47 -12 20 21 -13 21 53 -12 2 57 -13 39 21 0.12 47 0 0 -12 7 38 23 57 4.0 - 23 236 -46 -11 36 51 -12 38 26 -11 19 25 -12 55 55 0.12 48 0 0 -11 23 55 23 56 59.6 - 21 236 -45 -10 53 7 -11 54 46 -10 35 40 -12 12 16 0.12 49 0 0 -10 40 0 23 56 55.4 - 20 236 -44 -10 9 11 -11 10 52 - 9 51 43 -11 28 23 0.12 50 0 0 - 9 55 54 23 56 51.5 - 19 236 -42 - 9 25 4 -10 26 47 - 9 7 36 -10 44 18 0.12 51 0 0 - 9 11 38 23 56 47.8 - 18 235 -41 - 8 40 47 - 9 42 32 - 8 23 19 -10 0 4 0.12 52 0 0 - 8 27 15 23 56 44.3 - 16 235 -40 - 7 56 23 - 8 58 9 - 7 38 54 - 9 15 41 0.12 53 0 0 - 7 42 45 23 56 41.0 - 15 235 -39 - 7 11 53 - 8 13 39 - 6 54 24 - 8 31 11 0.12 54 0 0 - 6 58 10 23 56 38.0 - 14 235 -38 - 6 27 19 - 7 29 4 - 6 9 50 - 7 46 36 0.12 55 0 0 - 6 13 33 23 56 35.2 - 13 235 -36 - 5 42 41 - 6 44 26 - 5 25 13 - 7 1 58 0.13 56 0 0 - 5 28 53 23 56 32.6 - 12 235 -35 - 4 58 3 - 5 59 46 - 4 40 35 - 6 17 17 0.13 57 0 0 - 4 44 15 23 56 30.4 - 10 235 -34 - 4 13 25 - 5 15 6 - 3 55 58 - 5 32 37 0.13 58 0 0 - 3 59 38 23 56 28.3 - 9 234 -33 - 3 28 50 - 4 30 28 - 3 11 23 - 4 47 58 0.13 59 0 0 - 3 15 5 23 56 26.5 - 8 234 -32 - 2 44 18 - 3 45 53 - 2 26 52 - 4 3 22 0.14 60 0 0 - 2 30 37 23 56 25.0 - 7 234 -30 - 1 59 53 - 3 1 24 - 1 42 28 - 3 18 52 0.14 61 0 0 - 1 46 16 23 56 23.8 - 5 234 -29 - 1 15 34 - 2 17 1 - 0 58 11 - 2 34 28 0.15 62 0 0 - 1 2 4 23 56 22.8 - 4 234 -28 - 0 31 25 - 1 32 46 - 0 14 3 - 1 50 12 0.17 63 0 0 - 0 18 3 23 56 22.0 - 3 234 -27 0 12 34 - 0 48 42 0 29 55 - 1 6 6 0.19 64 0 0 0 25 47 23 56 21.5 - 2 234 -26 0 56 21 - 0 4 49 1 13 39 - 0 22 11 0.25 65 0 0 1 9 23 23 56 21.3 - 0 234 -24 1 39 53 0 38 50 .. .. .. 0 21 30 0.66 Uncertainty in time = +/- 4 secs Prediction of 2023 May 14.2 Data for the target star ------------------------ * name: UCAC4 272-102519 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 15 07.9064 DE: -35 39 19.074 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 15 07.9063 DE: -35 39 19.075 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (886) Washingtonia asteroid class: approx. diameter [km]: 91 approx. diameter ["]: 0.062 distance from Earth [AU]: 2.00960 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): 0.028", 0.009", 115.447° remarks: * orbital elements for (886)Washingtonia : Mean anomaly = 299.1431329593 deg Arg. of pericenter = 302.3642987739 deg Long. of node = 58.8454596984 deg Inclination = 16.8734300083 deg Eccentricity = 0.2712049643 Semimajor axis = 3.1670046645 AU Perihelion dist = 2.3080972774 AU Mag: H = 9.40, G = 0.15 Epoch of elements : MJD 60131.00375000 TDT (2023 Jul 06.0038) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Apr24,7.89,2023,7,6,0.091912,0.020558,-0.127473,-6.412346,-1.033118,0.002206,0.000957,0.000001,0.000000 -25.9224,-35.6830,179.80,22.73,False UCAC4 272-102519,17.25219622,-35.6552984,0.00,11.00,0.00,0.0,0,,17.27865486,-35.6830396,2.89,0.00,0,0,0 886,Washingtonia,13.81,90.8,2.0096,0,0,-2.302,-4.52,,4.6,0 0,298.9676,2023,7,5,302.3643,58.8455,16.8734,0.27120,3.16700,2.30810,9.35,5.0,0.15 1.283,0.0280,0.0093,115,0.0177,Known errors,-1.00,-1,-1,-1 20230706_102519,60078.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 14, 03:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org