IOTA/IOTA-ES occultation update for (209) Dido / TYC 6898-01910-1 event on 2023 Oct 26, 22:34 UT Visible from South America Summary ------- On 2023 Oct 26 UT, the 147.4 km diameter asteroid (209) Dido will occult a 10.6 mag star in the constellation Sagittarius 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 3.54 mag to 14.10 mag (the magnitude of the asteroid) for at most 6.740 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: 100 * date and approx. time of event: 2023 Oct 26, 22:30 - 2023 Oct 26, 22:39 * geocentric midpoint of event [JD]: 2460244.44099208 * magnitude of target star: 10.60 * magnitude drop [mag]: 3.54 * estimated maximum duration [s]: 6.740 * Moon: 95 % sunlit, 73° distance * Sun: 81° distance * rough path description: South America Additional comments ------------------- RUWE The occultation path -------------------- * approximate projected width [km]: 161 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.008", 0.001", 76°) * approx speed of asteroid's shadow [km/s]: 21.8687 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6898-01910-1 by 209 Dido on 2023 Oct 26 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 0 0 0 .. .. .... .. .. .. .. .. .. 2 8 9 .. .. .. 2 6 29 .. .. .. .... -163 0 0 2 26 38 22 30 34.1 1 117 75 1 38 24 3 15 12 1 36 44 3 16 53 .... -162 0 0 1 57 16 22 30 34.3 2 117 75 1 9 12 2 45 38 1 7 32 2 47 20 -0.22 -161 0 0 1 28 26 22 30 34.5 3 117 76 0 40 33 2 16 39 0 38 54 2 18 20 -0.30 -160 0 0 1 0 11 22 30 34.9 4 117 76 0 12 28 1 48 13 0 10 49 1 49 54 -0.33 -159 0 0 0 32 31 22 30 35.4 5 117 77 - 0 15 2 1 20 22 - 0 16 41 1 22 2 -0.35 -158 0 0 0 5 25 22 30 36.0 6 117 77 - 0 41 58 0 53 6 - 0 43 36 0 54 46 -0.37 -157 0 0 - 0 21 6 22 30 36.8 7 117 77 - 1 8 18 0 26 25 - 1 9 57 0 28 5 -0.37 -156 0 0 - 0 47 1 22 30 37.6 9 117 77 - 1 34 4 0 0 20 - 1 35 41 0 1 59 -0.38 -155 0 0 - 1 12 20 22 30 38.5 10 117 77 - 1 59 13 - 0 25 9 - 2 0 50 - 0 23 30 -0.39 -154 0 0 - 1 37 3 22 30 39.6 11 117 77 - 2 23 46 - 0 50 2 - 2 25 24 - 0 48 23 -0.39 -153 0 0 - 2 1 9 22 30 40.8 12 117 76 - 2 47 44 - 1 14 18 - 2 49 20 - 1 12 40 -0.40 -152 0 0 - 2 24 39 22 30 42.1 13 117 76 - 3 11 4 - 1 37 57 - 3 12 41 - 1 36 19 -0.40 -151 0 0 - 2 47 32 22 30 43.4 14 117 76 - 3 33 48 - 2 0 59 - 3 35 24 - 1 59 22 -0.40 -150 0 0 - 3 9 48 22 30 44.9 15 117 75 - 3 55 55 - 2 23 25 - 3 57 31 - 2 21 47 -0.40 -149 0 0 - 3 31 27 22 30 46.5 16 117 74 - 4 17 25 - 2 45 12 - 4 19 1 - 2 43 35 -0.41 -148 0 0 - 3 52 29 22 30 48.2 17 117 74 - 4 38 18 - 3 6 22 - 4 39 54 - 3 4 46 -0.41 -147 0 0 - 4 12 53 22 30 50.0 18 116 73 - 4 58 34 - 3 26 55 - 5 0 9 - 3 25 19 -0.41 -146 0 0 - 4 32 39 22 30 51.8 19 116 72 - 5 18 12 - 3 46 49 - 5 19 47 - 3 45 13 -0.41 -145 0 0 - 4 51 47 22 30 53.8 20 116 72 - 5 37 13 - 4 6 6 - 5 38 47 - 4 4 30 -0.41 -144 0 0 - 5 10 18 22 30 55.9 21 116 71 - 5 55 36 - 4 24 44 - 5 57 10 - 4 23 9 -0.41 -143 0 0 - 5 28 11 22 30 58.0 22 116 70 - 6 13 21 - 4 42 45 - 6 14 55 - 4 41 10 -0.41 -142 0 0 - 5 45 26 22 31 0.3 23 116 69 - 6 30 29 - 5 0 7 - 6 32 2 - 4 58 32 -0.42 -141 0 0 - 6 2 3 22 31 2.6 24 116 68 - 6 46 59 - 5 16 51 - 6 48 32 - 5 15 17 -0.42 -140 0 0 - 6 18 2 22 31 5.0 25 116 68 - 7 2 51 - 5 32 57 - 7 4 24 - 5 31 22 -0.42 -139 0 0 - 6 33 22 22 31 7.6 26 116 67 - 7 18 5 - 5 48 24 - 7 19 38 - 5 46 50 -0.42 -138 0 0 - 6 48 5 22 31 10.2 27 116 66 - 7 32 41 - 6 3 13 - 7 34 14 - 6 1 39 -0.42 -137 0 0 - 7 2 9 22 31 12.8 28 116 65 - 7 46 40 - 6 17 24 - 7 48 12 - 6 15 50 -0.42 -136 0 0 - 7 15 36 22 31 15.6 29 116 64 - 8 0 0 - 6 30 56 - 8 1 33 - 6 29 22 -0.42 -135 0 0 - 7 28 24 22 31 18.4 30 116 63 - 8 12 43 - 6 43 50 - 8 14 15 - 6 42 16 -0.42 -134 0 0 - 7 40 34 22 31 21.3 31 116 62 - 8 24 48 - 6 56 5 - 8 26 19 - 6 54 32 -0.42 -133 0 0 - 7 52 6 22 31 24.3 32 116 61 - 8 36 14 - 7 7 42 - 8 37 46 - 7 6 9 -0.42 -132 0 0 - 8 2 59 22 31 27.4 33 116 60 - 8 47 3 - 7 18 40 - 8 48 35 - 7 17 7 -0.42 -131 0 0 - 8 13 15 22 31 30.5 34 117 59 - 8 57 14 - 7 29 0 - 8 58 46 - 7 27 28 -0.42 -130 0 0 - 8 22 52 22 31 33.8 35 117 58 - 9 6 47 - 7 38 42 - 9 8 19 - 7 37 9 -0.42 -129 0 0 - 8 31 51 22 31 37.0 36 117 57 - 9 15 43 - 7 47 45 - 9 17 14 - 7 46 13 -0.43 -128 0 0 - 8 40 12 22 31 40.4 37 117 56 - 9 24 0 - 7 56 9 - 9 25 31 - 7 54 37 -0.43 -127 0 0 - 8 47 55 22 31 43.8 38 117 55 - 9 31 40 - 8 3 56 - 9 33 11 - 8 2 24 -0.43 -126 0 0 - 8 55 0 22 31 47.3 39 117 54 - 9 38 41 - 8 11 4 - 9 40 12 - 8 9 32 -0.43 -125 0 0 - 9 1 26 22 31 50.9 40 117 54 - 9 45 5 - 8 17 33 - 9 46 36 - 8 16 1 -0.43 -124 0 0 - 9 7 15 22 31 54.5 41 117 53 - 9 50 51 - 8 23 24 - 9 52 22 - 8 21 52 -0.43 -123 0 0 - 9 12 25 22 31 58.2 42 117 52 - 9 55 59 - 8 28 37 - 9 57 30 - 8 27 5 -0.43 -122 0 0 - 9 16 58 22 32 2.0 43 118 51 -10 0 30 - 8 33 11 -10 2 0 - 8 31 40 -0.43 -121 0 0 - 9 20 52 22 32 5.8 44 118 50 -10 4 22 - 8 37 7 -10 5 53 - 8 35 35 -0.43 -120 0 0 - 9 24 8 22 32 9.7 45 118 49 -10 7 37 - 8 40 24 -10 9 7 - 8 38 53 -0.43 -119 0 0 - 9 26 46 22 32 13.6 46 118 48 -10 10 14 - 8 43 3 -10 11 44 - 8 41 32 -0.43 -118 0 0 - 9 28 45 22 32 17.6 46 119 47 -10 12 13 - 8 45 4 -10 13 43 - 8 43 32 -0.43 -117 0 0 - 9 30 7 22 32 21.7 47 119 46 -10 13 34 - 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27 0 0 28 31 3 22 39 15.1 17 226 -47 27 37 18 29 25 16 27 35 26 29 27 9 -0.42 - 26 0 0 29 10 13 22 39 16.8 16 227 -48 28 16 29 30 4 24 28 14 37 30 6 18 -0.42 - 25 0 0 29 49 6 22 39 18.4 15 227 -48 28 55 23 30 43 15 28 53 31 30 45 9 -0.42 - 24 0 0 30 27 40 22 39 19.9 14 228 -49 29 33 59 31 21 47 29 32 7 31 23 40 -0.42 - 23 0 0 31 5 54 22 39 21.2 13 228 -50 30 12 15 31 59 58 30 10 24 32 1 52 -0.42 - 22 0 0 31 43 47 22 39 22.4 12 229 -50 30 50 12 32 37 48 30 48 21 32 39 42 -0.43 - 21 0 0 32 21 18 22 39 23.6 11 229 -51 31 27 47 33 15 16 31 25 56 33 17 9 -0.43 - 20 0 0 32 58 27 22 39 24.6 9 230 -51 32 5 0 33 52 20 32 3 9 33 54 13 -0.43 - 19 0 0 33 35 11 22 39 25.4 8 230 -52 32 41 49 34 29 0 32 39 58 34 30 53 -0.43 - 18 0 0 34 11 31 22 39 26.2 7 231 -52 33 18 13 35 5 14 33 16 22 35 7 7 -0.43 - 17 0 0 34 47 25 22 39 26.9 6 232 -53 33 54 12 35 41 3 33 52 22 35 42 55 -0.43 - 16 0 0 35 22 52 22 39 27.5 5 232 -53 34 29 46 36 16 24 34 27 55 36 18 16 -0.43 - 15 0 0 35 57 52 22 39 27.9 4 233 -54 35 4 52 36 51 17 35 3 2 36 53 9 -0.43 - 14 0 0 36 32 23 22 39 28.3 3 233 -54 35 39 30 37 25 42 35 37 41 37 27 34 -0.43 - 13 0 0 37 6 27 22 39 28.5 2 234 -54 36 13 41 37 59 38 36 11 51 38 1 29 -0.43 - 12 0 0 37 40 0 22 39 28.7 1 235 -55 36 47 22 38 33 4 36 45 33 38 34 55 -0.43 - 11 0 0 38 13 4 22 39 28.8 0 235 -55 37 20 34 .. .. .. 37 18 45 .. .. .. -0.45 0 0 0 .. .. .... .. .. .. .. .. .. 37 53 16 .. .. .. 37 51 27 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: TYC 6898-01910-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 48 44.0411 DE: -26 30 25.686 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 48 44.0410 DE: -26 30 25.686 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (209) Dido asteroid class: approx. diameter [km]: 147 approx. diameter ["]: 0.067 distance from Earth [AU]: 3.04610 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#123 date of fit: 2023 Oct 09 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): 0.008", 0.001", 76.051° remarks: * orbital elements for (209)Dido : Mean anomaly = 56.9908004198 deg Arg. of pericenter = 249.7488414837 deg Long. of node = 0.6321802570 deg Inclination = 7.1701399377 deg Eccentricity = 0.0548968495 Semimajor axis = 3.1459978069 AU Perihelion dist = 2.9732924387 AU Mag: H = 8.35, G = 0.15 Epoch of elements : MJD 60243.94090278 TDT (2023 Oct 26.9409) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1232023Oct09,6.74,2023,10,26,22.583810,-0.138021,0.373240,11.574615,4.287897,0.005701,0.000987,0.000000,0.000000 -76.2524,-26.4494,-162.77,-12.60,False TYC 6898-01910-1,19.81223367,-26.5071349,0.00,10.60,0.00,0.0,0,,19.83629378,-26.4494380,3.54,0.00,0,0,0 209,Dido,14.10,147.400,3.0461,0,0,2.488,12.38,,8.2,0 0,56.8246,2023,10,26,249.7488,0.6322,7.1701,0.05490,3.14600,2.97329,8.29,5.0,0.15 1.017,0.0080,0.0007,76,0.0080,Known errors,-1.00,0,-1,-1 20231026_1910-1,60232.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 20:57 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org