IOTA/IOTA-ES occultation update for (24) Themis / TYC 5252-00998-1 event on 2022 Jun 30, 18:59 UT Visible from Australia Summary ------- On 2022 Jun 30 UT, the 196.1 km diameter asteroid (24) Themis will occult a 11.3 mag star in the constellation Pisces for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.22 mag to 13.35 mag (the magnitude of the asteroid) for at most 23.960 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: 2022 Jun 30, 18:46 - 2022 Jun 30, 19:12 * geocentric midpoint of event [JD]: 2459761.29133659 * magnitude of target star: 11.28 * magnitude drop [mag]: 2.22 * estimated maximum duration [s]: 23.960 * Moon: 2 % sunlit, 120° distance * Sun: 103° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 208 * 1 sigma uncertainty interval [path widths]: +/- 0.01 * 1 sigma uncertainty interval [seconds]: +/- 2.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.001", 66°) * approx speed of asteroid's shadow [km/s]: 8.1830 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5252-00998-1 by 24 Themis on 2022 Jun 30 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 65 0 0 -41 37 25 18 47 17.2 0 92 -68 -42 33 52 -40 41 16 -42 35 17 -40 39 52 .... 66 0 0 -41 39 16 18 47 17.3 1 92 -68 -42 35 43 -40 43 9 -42 37 8 -40 41 45 0.24 67 0 0 -41 40 49 18 47 17.6 2 91 -69 -42 37 15 -40 44 43 -42 38 39 -40 43 19 0.29 68 0 0 -41 42 3 18 47 18.0 3 90 -69 -42 38 28 -40 45 58 -42 39 52 -40 44 34 0.30 69 0 0 -41 42 59 18 47 18.5 3 90 -70 -42 39 22 -40 46 54 -42 40 47 -40 45 30 0.31 70 0 0 -41 43 35 18 47 19.2 4 89 -70 -42 39 58 -40 47 31 -42 41 22 -40 46 7 0.32 71 0 0 -41 43 52 18 47 20.1 5 88 -70 -42 40 14 -40 47 49 -42 41 39 -40 46 25 0.32 72 0 0 -41 43 50 18 47 21.0 6 88 -70 -42 40 12 -40 47 47 -42 41 37 -40 46 24 0.33 73 0 0 -41 43 30 18 47 22.2 6 87 -71 -42 39 52 -40 47 27 -42 41 16 -40 46 3 0.33 74 0 0 -41 42 50 18 47 23.4 7 86 -71 -42 39 12 -40 46 47 -42 40 36 -40 45 23 0.33 75 0 0 -41 41 51 18 47 24.8 8 86 -71 -42 38 13 -40 45 48 -42 39 38 -40 44 24 0.33 76 0 0 -41 40 33 18 47 26.4 9 85 -71 -42 36 55 -40 44 29 -42 38 20 -40 43 6 0.33 77 0 0 -41 38 56 18 47 28.1 9 84 -71 -42 35 19 -40 42 52 -42 36 43 -40 41 28 0.33 78 0 0 -41 36 59 18 47 29.9 10 84 -71 -42 33 23 -40 40 55 -42 34 48 -40 39 31 0.34 79 0 0 -41 34 44 18 47 31.9 11 83 -71 -42 31 8 -40 38 38 -42 32 33 -40 37 14 0.34 80 0 0 -41 32 8 18 47 34.0 12 82 -72 -42 28 34 -40 36 2 -42 29 59 -40 34 38 0.34 81 0 0 -41 29 14 18 47 36.3 12 82 -72 -42 25 41 -40 33 6 -42 27 6 -40 31 42 0.34 82 0 0 -41 26 0 18 47 38.7 13 81 -71 -42 22 29 -40 29 51 -42 23 53 -40 28 27 0.34 83 0 0 -41 22 27 18 47 41.2 14 80 -71 -42 18 57 -40 26 16 -42 20 22 -40 24 52 0.34 84 0 0 -41 18 34 18 47 43.9 15 80 -71 -42 15 6 -40 22 22 -42 16 31 -40 20 58 0.34 85 0 0 -41 14 22 18 47 46.8 15 79 -71 -42 10 56 -40 18 7 -42 12 20 -40 16 43 0.34 86 0 0 -41 9 50 18 47 49.8 16 78 -71 -42 6 26 -40 13 33 -42 7 51 -40 12 9 0.34 87 0 0 -41 4 58 18 47 52.9 17 78 -71 -42 1 36 -40 8 39 -42 3 1 -40 7 15 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4 21 46 - 6 22 37 - 4 20 17 0.37 -162 0 0 - 5 1 24 19 7 57.4 43 272 29 - 6 1 10 - 4 2 2 - 6 2 40 - 4 0 33 0.37 -161 0 0 - 4 41 55 19 8 8.0 42 271 30 - 5 41 34 - 3 42 39 - 5 43 4 - 3 41 10 0.37 -160 0 0 - 4 22 48 19 8 18.5 41 271 31 - 5 22 21 - 3 23 38 - 5 23 50 - 3 22 10 0.37 -159 0 0 - 4 4 3 19 8 28.7 40 271 32 - 5 3 30 - 3 5 0 - 5 4 59 - 3 3 31 0.37 -158 0 0 - 3 45 41 19 8 38.6 39 270 33 - 4 45 1 - 2 46 44 - 4 46 30 - 2 45 16 0.37 -157 0 0 - 3 27 41 19 8 48.3 38 270 34 - 4 26 55 - 2 28 50 - 4 28 24 - 2 27 23 0.37 -156 0 0 - 3 10 5 19 8 57.8 37 270 35 - 4 9 12 - 2 11 20 - 4 10 41 - 2 9 53 0.37 -155 0 0 - 2 52 52 19 9 7.0 36 270 36 - 3 51 53 - 1 54 14 - 3 53 22 - 1 52 46 0.37 -154 0 0 - 2 36 3 19 9 16.0 35 269 37 - 3 34 58 - 1 37 31 - 3 36 26 - 1 36 3 0.37 -153 0 0 - 2 19 38 19 9 24.7 34 269 38 - 3 18 26 - 1 21 11 - 3 19 55 - 1 19 44 0.37 -152 0 0 - 2 3 36 19 9 33.2 33 269 39 - 3 2 19 - 1 5 16 - 3 3 47 - 1 3 49 0.37 -151 0 0 - 1 48 0 19 9 41.4 32 269 40 - 2 46 36 - 0 49 45 - 2 48 4 - 0 48 18 0.37 -150 0 0 - 1 32 47 19 9 49.4 31 269 41 - 2 31 18 - 0 34 39 - 2 32 46 - 0 33 12 0.37 -149 0 0 - 1 17 59 19 9 57.1 30 268 42 - 2 16 24 - 0 19 57 - 2 17 52 - 0 18 30 0.37 -148 0 0 - 1 3 36 19 10 4.5 29 268 43 - 2 1 56 - 0 5 39 - 2 3 23 - 0 4 13 0.37 -147 0 0 - 0 49 39 19 10 11.7 28 268 44 - 1 47 52 0 8 13 - 1 49 20 0 9 40 0.37 -146 0 0 - 0 36 6 19 10 18.7 27 268 45 - 1 34 14 0 21 41 - 1 35 41 0 23 7 0.37 -145 0 0 - 0 22 58 19 10 25.3 26 268 46 - 1 21 1 0 34 43 - 1 22 28 0 36 9 0.37 -144 0 0 - 0 10 16 19 10 31.7 25 268 47 - 1 8 13 0 47 20 - 1 9 40 0 48 46 0.37 -143 0 0 0 2 1 19 10 37.9 24 268 48 - 0 55 51 0 59 32 - 0 57 18 1 0 58 0.37 -142 0 0 0 13 53 19 10 43.8 22 268 49 - 0 43 55 1 11 19 - 0 45 21 1 12 45 0.37 -141 0 0 0 25 19 19 10 49.4 21 268 50 - 0 32 24 1 22 40 - 0 33 50 1 24 6 0.37 -140 0 0 0 36 19 19 10 54.7 20 268 51 - 0 21 19 1 33 36 - 0 22 45 1 35 1 0.37 -139 0 0 0 46 54 19 10 59.8 19 268 52 - 0 10 39 1 44 6 - 0 12 6 1 45 32 0.37 -138 0 0 0 57 3 19 11 4.6 18 268 52 - 0 0 26 1 54 11 - 0 1 52 1 55 36 0.37 -137 0 0 1 6 46 19 11 9.2 17 268 53 0 9 21 2 3 50 0 7 55 2 5 15 0.37 -136 0 0 1 16 3 19 11 13.5 16 267 54 0 18 43 2 13 3 0 17 17 2 14 28 0.37 -135 0 0 1 24 55 19 11 17.5 15 267 55 0 27 38 2 21 51 0 26 12 2 23 16 0.37 -134 0 0 1 33 21 19 11 21.3 14 267 56 0 36 8 2 30 13 0 34 42 2 31 38 0.37 -133 0 0 1 41 21 19 11 24.8 13 267 57 0 44 12 2 38 9 0 42 46 2 39 34 0.38 -132 0 0 1 48 55 19 11 28.1 12 268 58 0 51 49 2 45 40 0 50 23 2 47 5 0.38 -131 0 0 1 56 3 19 11 31.1 11 268 58 0 59 1 2 52 45 0 57 35 2 54 10 0.38 -130 0 0 2 2 46 19 11 33.8 10 268 59 1 5 46 2 59 25 1 4 21 3 0 49 0.38 -129 0 0 2 9 2 19 11 36.3 9 268 60 1 12 6 3 5 39 1 10 41 3 7 3 0.38 -128 0 0 2 14 53 19 11 38.5 8 268 61 1 18 0 3 11 27 1 16 35 3 12 51 0.38 -127 0 0 2 20 19 19 11 40.4 7 268 62 1 23 28 3 16 49 1 22 2 3 18 14 0.39 -126 0 0 2 25 18 19 11 42.1 6 268 62 1 28 30 3 21 46 1 27 4 3 23 11 0.39 -125 0 0 2 29 52 19 11 43.6 5 268 63 1 33 6 3 26 18 1 31 41 3 27 42 0.40 -124 0 0 2 34 0 19 11 44.7 4 268 64 1 37 16 3 30 24 1 35 51 3 31 48 0.40 -123 0 0 2 37 43 19 11 45.7 3 268 64 1 41 1 3 34 5 1 39 36 3 35 29 0.42 -122 0 0 2 41 0 19 11 46.3 2 268 65 1 44 20 3 37 20 1 42 54 3 38 44 0.45 -121 0 0 2 43 51 19 11 46.8 1 268 65 1 47 13 3 40 10 1 45 48 3 41 34 0.52 -120 0 0 2 46 18 19 11 46.9 0 268 66 1 49 40 3 42 35 1 48 15 3 43 59 1.61 Uncertainty in time = +/- 3 secs Prediction of 2022 Jun 13.9 Data for the target star ------------------------ * name: TYC 5252-00998-1 * constellation : Pisces * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 23 46 58.0741 DE: -02 10 20.011 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 23 46 58.0742 DE: -02 10 20.010 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (24) Themis asteroid class: ShapeModel approx. diameter [km]: 196 approx. diameter ["]: 0.086 distance from Earth [AU]: 3.14480 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#132 date of fit: 2022 Jun 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): 0.009", 0.001", 66.479° remarks: * orbital elements for (24)Themis : Mean anomaly = 200.1611759495 deg Arg. of pericenter = 107.6189899620 deg Long. of node = 36.1004472566 deg Inclination = 0.7507691561 deg Eccentricity = 0.1206244942 Semimajor axis = 3.1472400271 AU Perihelion dist = 2.7676057906 AU Mag: H = 7.30, G = 0.19 Epoch of elements : MJD 59760.79145833 TDT (2022 Jun 30.7915) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1322022Jun09,23.96,2022,6,30,18.992078,0.124759,-0.306594,4.279644,1.736963,-0.005124,-0.002204,0.000000,0.000000 153.3239,-2.0481,-103.93,23.13,False TYC 5252-00998-1,23.78279838,-2.1722251,0.00,11.28,0.00,0.0,0,,23.80189404,-2.0480876,2.22,0.00,0,0,0 24,Themis,13.35,196.1,3.1448,0,0,0.799,4.86,,11.4 0,200.0215,2022,6,30,107.6190,36.1004,0.7508,0.12062,3.14724,2.76761,7.25,5.0,0.15 1.012,0.0093,0.0010,66,0.0011,Known errors,-1.00,-1,-1,-1 20220630_0998-1,59743.85 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Jun 13, 20:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org