IOTA/IOTA-ES occultation update for (886) Washingtonia / TYC 6836-00983-1 event on 2023 Mar 11, 16:38 UT Visible from New Zealand, Australia Summary ------- On 2023 Mar 11 UT, the 90.8 km diameter asteroid (886) Washingtonia will occult a 9.9 mag star in the constellation Sagittarius for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.50 mag to 15.38 mag (the magnitude of the asteroid) for at most 4.530 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 Mar 11, 16:33 - 2023 Mar 11, 16:43 * geocentric midpoint of event [JD]: 2460015.19323500 * magnitude of target star: 9.89 * magnitude drop [mag]: 5.50 * estimated maximum duration [s]: 4.530 * Moon: 83 % sunlit, 48° distance * Sun: 84° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 97 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.006", 108°) * approx speed of asteroid's shadow [km/s]: 20.0439 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6836-00983-1 by 886 Washingtonia on 2023 Mar 11 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 118 0 0 - 2 57 12 16 33 19.5 0 116 -82 - 3 26 57 - 2 27 33 - 3 36 9 - 2 18 26 .... 119 0 0 - 3 27 43 16 33 19.6 2 116 -81 - 3 57 35 - 2 57 58 - 4 6 48 - 2 48 49 0.36 120 0 0 - 3 58 44 16 33 19.9 3 116 -80 - 4 28 42 - 3 28 53 - 4 37 58 - 3 19 42 0.38 121 0 0 - 4 30 15 16 33 20.3 4 116 -79 - 5 0 19 - 4 0 17 - 5 9 37 - 3 51 5 0.39 122 0 0 - 5 2 14 16 33 20.8 5 116 -78 - 5 32 25 - 4 32 11 - 5 41 45 - 4 22 56 0.39 123 0 0 - 5 34 42 16 33 21.4 6 116 -77 - 6 4 59 - 5 4 32 - 6 14 21 - 4 55 16 0.39 124 0 0 - 6 7 38 16 33 22.2 7 116 -76 - 6 38 1 - 5 37 22 - 6 47 25 - 5 28 3 0.39 125 0 0 - 6 41 0 16 33 23.2 8 116 -75 - 7 11 30 - 6 10 38 - 7 20 56 - 6 1 17 0.40 126 0 0 - 7 14 49 16 33 24.2 10 116 -74 - 7 45 25 - 6 44 20 - 7 54 52 - 6 34 58 0.40 127 0 0 - 7 49 3 16 33 25.4 11 116 -73 - 8 19 45 - 7 18 28 - 8 29 14 - 7 9 4 0.40 128 0 0 - 8 23 41 16 33 26.8 12 115 -72 - 8 54 29 - 7 53 0 - 9 4 0 - 7 43 34 0.40 129 0 0 - 8 58 43 16 33 28.2 13 115 -71 - 9 29 37 - 8 27 56 - 9 39 10 - 8 18 28 0.40 130 0 0 - 9 34 7 16 33 29.8 14 115 -69 -10 5 7 - 9 3 15 -10 14 42 - 8 53 45 0.40 131 0 0 -10 9 53 16 33 31.6 15 115 -68 -10 40 59 - 9 38 55 -10 50 36 - 9 29 24 0.40 132 0 0 -10 46 0 16 33 33.5 16 115 -67 -11 17 11 -10 14 56 -11 26 50 -10 5 23 0.40 133 0 0 -11 22 26 16 33 35.5 18 114 -66 -11 53 43 -10 51 17 -12 3 23 -10 41 42 0.40 134 0 0 -11 59 10 16 33 37.7 19 114 -65 -12 30 33 -11 27 56 -12 40 15 -11 18 20 0.40 135 0 0 -12 36 13 16 33 40.0 20 114 -64 -13 7 40 -12 4 53 -13 17 24 -11 55 15 0.40 136 0 0 -13 13 31 16 33 42.4 21 114 -63 -13 45 3 -12 42 6 -13 54 49 -12 32 27 0.40 137 0 0 -13 51 4 16 33 45.0 22 113 -61 -14 22 42 -13 19 34 -14 32 28 -13 9 54 0.40 138 0 0 -14 28 51 16 33 47.6 23 113 -60 -15 0 33 -13 57 17 -15 10 21 -13 47 34 0.40 139 0 0 -15 6 50 16 33 50.5 24 113 -59 -15 38 37 -14 35 11 -15 48 26 -14 25 28 0.40 140 0 0 -15 45 0 16 33 53.4 26 112 -58 -16 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21 47 -38 19 55 -39 31 22 -38 10 26 0.45 - 50 0 0 -38 22 9 16 43 9.9 6 241 52 -38 53 14 -37 51 12 -39 2 51 -37 41 41 0.46 - 49 0 0 -37 53 2 16 43 10.4 5 241 52 -38 24 12 -37 22 0 -38 33 51 -37 12 27 0.47 - 48 0 0 -37 23 27 16 43 10.9 4 240 52 -37 54 42 -36 52 19 -38 4 22 -36 42 45 0.48 - 47 0 0 -36 53 24 16 43 11.3 4 239 51 -37 24 44 -36 22 11 -37 34 25 -36 12 36 0.51 - 46 0 0 -36 22 53 16 43 11.6 3 239 51 -36 54 18 -35 51 36 -37 4 0 -35 41 59 0.55 - 45 0 0 -35 51 55 16 43 11.9 2 238 51 -36 23 24 -35 20 34 -36 33 8 -35 10 55 0.64 - 44 0 0 -35 20 31 16 43 12.0 1 238 51 -35 52 4 -34 49 5 -36 1 50 -34 39 25 0.99 - 43 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. -35 30 5 .. .. .. .... Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: TYC 6836-00983-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 43 51.8994 DE: -26 25 22.154 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 43 51.8998 DE: -26 25 22.154 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (886) Washingtonia asteroid class: approx. diameter [km]: 91 approx. diameter ["]: 0.039 distance from Earth [AU]: 3.21450 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 date of fit: 2023 Feb 07 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): 0.016", 0.006", 107.776° remarks: * orbital elements for (886)Washingtonia : Mean anomaly = 278.8301755136 deg Arg. of pericenter = 302.3404394714 deg Long. of node = 58.8447438573 deg Inclination = 16.8728704164 deg Eccentricity = 0.2712091722 Semimajor axis = 3.1673861444 AU Perihelion dist = 2.3083619700 AU Mag: H = 9.33, G = 0.15 Epoch of elements : MJD 60014.69326389 TDT (2023 Mar 11.6933) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Feb07,4.53,2023,3,11,16.637640,-0.115190,-0.344631,10.742689,-3.547680,-0.005877,0.000118,0.000000,0.000000 -152.3229,-26.4333,-67.06,-3.63,False TYC 6836-00983-1,17.73108314,-26.4228205,0.00,9.89,0.00,0.0,0,,17.75490239,-26.4333090,5.49,0.00,0,0,0 886,Washingtonia,15.38,90.8,3.2145,0,0,2.188,-9.70,,4.6,0 0,278.7090,2023,3,11,302.3404,58.8447,16.8729,0.27121,3.16739,2.30836,9.35,5.0,0.15 1.154,0.0163,0.0060,108,0.0060,Known errors,-1.00,-1,-1,-1 20230311_0983-1,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org