IOTA/IOTA-ES occultation update for (23) Thalia / TYC 5270-00286-1 event on 2022 Oct 05, 12:51 UT Visible from SE Australia Summary ------- On 2022 Oct 05 UT, the 103.9 km diameter asteroid (23) Thalia will occult a 11.6 mag star in the constellation Cetus for observers along a path across SE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.55 mag to 11.13 mag (the magnitude of the asteroid) for at most 7.880 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: 99 * date and approx. time of event: 2022 Oct 05, 12:43 - 2022 Oct 05, 12:59 * geocentric midpoint of event [JD]: 2459858.03572338 * magnitude of target star: 11.57 * magnitude drop [mag]: 0.55 * estimated maximum duration [s]: 7.880 * Moon: 78 % sunlit, 51° distance * Sun: 166° distance * rough path description: SE Australia The occultation path -------------------- * approximate projected width [km]: 112 * 1 sigma uncertainty interval [path widths]: +/- 0.25 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.022) * 1 sigma uncertainty ellipse (major, minor, PA): (0.028", 0.019", 61°) * approx speed of asteroid's shadow [km/s]: 13.1826 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5270-00286-1 by 23 Thalia on 2022 Oct 5 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 68 0 0 -37 54 43 12 58 53.5 1 101 6 -37 23 52 -38 25 40 -37 8 33 -38 41 7 .... 69 0 0 -38 3 43 12 58 53.3 2 100 6 -37 32 54 -38 34 39 -37 17 36 -38 50 5 0.34 70 0 0 -38 12 27 12 58 53.1 2 99 5 -37 41 40 -38 43 22 -37 26 23 -38 58 47 0.37 71 0 0 -38 20 56 12 58 52.7 3 99 4 -37 50 10 -38 51 48 -37 34 54 -39 7 13 0.38 72 0 0 -38 29 8 12 58 52.3 4 98 3 -37 58 24 -39 0 0 -37 43 9 -39 15 23 0.38 73 0 0 -38 37 5 12 58 51.7 5 97 3 -38 6 22 -39 7 55 -37 51 8 -39 23 18 0.39 74 0 0 -38 44 46 12 58 51.1 5 97 2 -38 14 5 -39 15 34 -37 58 51 -39 30 56 0.39 75 0 0 -38 52 11 12 58 50.4 6 96 1 -38 21 31 -39 22 57 -38 6 18 -39 38 19 0.39 76 0 0 -38 59 20 12 58 49.5 7 96 0 -38 28 41 -39 30 5 -38 13 29 -39 45 26 0.39 77 0 0 -39 6 13 12 58 48.6 8 95 -1 -38 35 36 -39 36 56 -38 20 24 -39 52 17 0.39 78 0 0 -39 12 50 12 58 47.6 9 94 -1 -38 42 14 -39 43 32 -38 27 3 -39 58 52 0.40 79 0 0 -39 19 11 12 58 46.4 9 94 -2 -38 48 36 -39 49 52 -38 33 26 -40 5 11 0.40 80 0 0 -39 25 16 12 58 45.2 10 93 -3 -38 54 43 -39 55 56 -38 39 33 -40 11 14 0.40 81 0 0 -39 31 5 12 58 43.9 11 92 -4 -39 0 33 -40 1 44 -38 45 24 -40 17 2 0.40 82 0 0 -39 36 39 12 58 42.5 12 92 -4 -39 6 8 -40 7 16 -38 50 59 -40 22 33 0.40 83 0 0 -39 41 56 12 58 41.1 12 91 -5 -39 11 26 -40 12 33 -38 56 18 -40 27 49 0.40 84 0 0 -39 46 58 12 58 39.5 13 90 -6 -39 16 29 -40 17 33 -39 1 21 -40 32 49 0.40 85 0 0 -39 51 43 12 58 37.8 14 90 -6 -39 21 16 -40 22 18 -39 6 8 -40 37 34 0.40 86 0 0 -39 56 13 12 58 36.1 15 89 -7 -39 25 46 -40 26 47 -39 10 39 -40 42 2 0.40 87 0 0 -40 0 27 12 58 34.3 16 89 -8 -39 30 1 -40 31 0 -39 14 55 -40 46 15 0.40 88 0 0 -40 4 25 12 58 32.3 16 88 -9 -39 34 0 -40 34 58 -39 18 54 -40 50 12 0.40 89 0 0 -40 8 8 12 58 30.3 17 87 -9 -39 37 43 -40 38 39 -39 22 37 -40 53 53 0.40 90 0 0 -40 11 34 12 58 28.3 18 87 -10 -39 41 10 -40 42 5 -39 26 5 -40 57 18 0.40 91 0 0 -40 14 45 12 58 26.1 19 86 -11 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-112 0 0 - 8 30 31 12 44 8.3 11 263 -7 - 7 59 30 - 9 1 38 - 7 44 7 - 9 17 9 0.43 -111 0 0 - 8 18 10 12 44 6.7 10 262 -6 - 7 47 11 - 8 49 15 - 7 31 49 - 9 4 46 0.43 -110 0 0 - 8 6 5 12 44 5.2 9 262 -5 - 7 35 9 - 8 37 9 - 7 19 47 - 8 52 39 0.44 -109 0 0 - 7 54 18 12 44 3.9 8 262 -4 - 7 23 23 - 8 25 20 - 7 8 2 - 8 40 50 0.44 -108 0 0 - 7 42 48 12 44 2.8 7 262 -3 - 7 11 54 - 8 13 48 - 6 56 34 - 8 29 17 0.45 -107 0 0 - 7 31 35 12 44 1.8 6 262 -2 - 7 0 43 - 8 2 34 - 6 45 24 - 8 18 2 0.45 -106 0 0 - 7 20 40 12 44 0.9 5 262 -1 - 6 49 49 - 7 51 37 - 6 34 31 - 8 7 4 0.46 -105 0 0 - 7 10 2 12 44 0.3 4 262 0 - 6 39 13 - 7 40 58 - 6 23 56 - 7 56 25 0.48 -104 0 0 - 6 59 43 12 43 59.7 3 261 0 - 6 28 55 - 7 30 37 - 6 13 38 - 7 46 3 0.50 -103 0 0 - 6 49 42 12 43 59.4 2 261 1 - 6 18 56 - 7 20 35 - 6 3 39 - 7 36 0 0.56 -102 0 0 - 6 39 59 12 43 59.2 1 261 2 - 6 9 14 - 7 10 51 - 5 53 59 - 7 26 15 0.78 Uncertainty in time = +/- 3 secs Prediction of 2022 Aug 20.1 Data for the target star ------------------------ * name: TYC 5270-00286-1 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 00 50 17.5139 DE: -08 54 42.466 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 00 50 17.5139 DE: -08 54 42.467 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (23) Thalia asteroid class: approx. diameter [km]: 104 approx. diameter ["]: 0.079 distance from Earth [AU]: 1.82050 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#108 date of fit: 2022 Aug 03 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", 0.019", 61.245° remarks: * orbital elements for (23)Thalia : Mean anomaly = 266.3826328149 deg Arg. of pericenter = 61.2793080440 deg Long. of node = 66.5264392629 deg Inclination = 10.1020940765 deg Eccentricity = 0.2314003652 Semimajor axis = 2.6307667735 AU Perihelion dist = 2.0220063813 AU Mag: H = 7.18, G = 0.15 Epoch of elements : MJD 59857.53562500 TDT (2022 Oct 05.5356) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1082022Aug03,7.88,2022,10,5,12.857361,0.103452,-0.365733,-7.161326,-2.019535,-0.000130,0.001365,0.000001,0.000001 165.8231,-8.7869,-15.75,-4.85,False TYC 5270-00286-1,0.83819831,-8.9117962,0.00,11.57,0.00,0.0,0,,0.85751617,-8.7869418,0.56,0.00,0,0,0 23,Thalia,11.13,103.9,1.8205,0,0,-2.333,-9.75,,6.4,0 0,266.2589,2022,10,5,61.2793,66.5264,10.1021,0.23140,2.63077,2.02201,7.18,5.0,0.15 1.249,0.0283,0.0190,61,0.0196,Known errors,-1.00,-1,-1,-1 20221005_0286-1,59811.11 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Aug 20, 02:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org