IOTA/IOTA-ES occultation update for (17) Thetis / HIP 66212 event on 2023 Mar 23, 06:17 UT Visible from Mexico, South America Summary ------- On 2023 Mar 23 UT, the 83.9 km diameter asteroid (17) Thetis will occult a 7.5 mag star in the constellation Virgo for observers along a path across Mexico, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.26 mag to 8.39 mag (the combined magnitude of the asteroid and the close companion star) for at most 10.460 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 Mar 23, 06:03 - 2023 Mar 23, 06:30 * geocentric midpoint of event [JD]: 2460026.76188609 * magnitude of target star: 7.53 * magnitude drop [mag]: 1.26 * estimated maximum duration [s]: 10.460 * Moon: 3 % sunlit, 172° distance * Sun: 158° distance * rough path description: Mexico, South America Additional comments ------------------- RUWE high, close double star The occultation path -------------------- * approximate projected width [km]: 84 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 111°) * approx speed of asteroid's shadow [km/s]: 8.0199 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 66212 by 17 Thetis on 2023 Mar 23 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 -163 0 0 39 49 9 6 30 18.5 1 91 -17 40 11 52 39 26 27 40 14 5 39 24 14 .... -162 0 0 39 48 3 6 30 18.3 1 92 -18 40 10 47 39 25 20 40 12 59 39 23 8 -0.03 -161 0 0 39 46 28 6 30 18.0 2 92 -18 40 9 12 39 23 45 40 11 25 39 21 32 -0.04 -160 0 0 39 44 25 6 30 17.5 3 93 -19 40 7 9 39 21 41 40 9 22 39 19 28 -0.04 -159 0 0 39 41 52 6 30 16.9 4 94 -20 40 4 38 39 19 8 40 6 51 39 16 55 -0.05 -158 0 0 39 38 51 6 30 16.1 4 94 -21 40 1 38 39 16 5 40 3 51 39 13 52 -0.05 -157 0 0 39 35 21 6 30 15.2 5 95 -21 39 58 9 39 12 34 40 0 22 39 10 21 -0.05 -156 0 0 39 31 23 6 30 14.2 6 96 -22 39 54 11 39 8 34 39 56 25 39 6 21 -0.05 -155 0 0 39 26 55 6 30 13.0 7 96 -23 39 49 45 39 4 5 39 51 58 39 1 52 -0.05 -154 0 0 39 21 58 6 30 11.6 8 97 -23 39 44 50 38 59 7 39 47 4 38 56 54 -0.05 -153 0 0 39 16 33 6 30 10.1 8 97 -24 39 39 26 38 53 40 39 41 40 38 51 27 -0.05 -152 0 0 39 10 39 6 30 8.5 9 98 -25 39 33 34 38 47 44 39 35 48 38 45 30 -0.05 -151 0 0 39 4 15 6 30 6.7 10 99 -26 39 27 12 38 41 19 39 29 26 38 39 5 -0.05 -150 0 0 38 57 23 6 30 4.8 11 99 -26 39 20 22 38 34 24 39 22 36 38 32 10 -0.05 -149 0 0 38 50 1 6 30 2.7 11 100 -27 39 13 2 38 27 0 39 15 17 38 24 46 -0.06 -148 0 0 38 42 10 6 30 0.4 12 101 -28 39 5 13 38 19 6 39 7 28 38 16 52 -0.06 -147 0 0 38 33 49 6 29 58.1 13 101 -29 38 56 55 38 10 43 38 59 10 38 8 28 -0.06 -146 0 0 38 24 59 6 29 55.5 14 102 -29 38 48 8 38 1 51 38 50 23 37 59 36 -0.06 -145 0 0 38 15 39 6 29 52.8 15 102 -30 38 38 51 37 52 28 38 41 6 37 50 13 -0.06 -144 0 0 38 5 50 6 29 49.9 15 103 -31 38 29 4 37 42 36 38 31 20 37 40 20 -0.06 -143 0 0 37 55 30 6 29 46.9 16 104 -32 38 18 47 37 32 13 38 21 3 37 29 57 -0.06 -142 0 0 37 44 41 6 29 43.7 17 104 -33 38 8 1 37 21 21 38 10 17 37 19 5 -0.06 -141 0 0 37 33 21 6 29 40.4 18 105 -33 37 56 45 37 9 58 37 59 1 37 7 41 -0.06 -140 0 0 37 21 31 6 29 36.9 19 105 -34 37 44 58 36 58 5 37 47 15 36 55 48 -0.06 -139 0 0 37 9 11 6 29 33.2 19 106 -35 37 32 41 36 45 41 37 34 59 36 43 24 -0.06 -138 0 0 36 56 20 6 29 29.4 20 107 -36 37 19 54 36 32 46 37 22 12 36 30 29 -0.06 -137 0 0 36 42 58 6 29 25.4 21 107 -36 37 6 36 36 19 21 37 8 54 36 17 3 -0.06 -136 0 0 36 29 6 6 29 21.2 22 108 -37 36 52 47 36 5 25 36 55 6 36 3 7 -0.06 -135 0 0 36 14 42 6 29 16.8 23 108 -38 36 38 27 35 50 57 36 40 46 35 48 39 -0.06 -134 0 0 35 59 47 6 29 12.3 24 109 -39 36 23 37 35 35 59 36 25 56 35 33 40 -0.06 -133 0 0 35 44 21 6 29 7.6 24 110 -39 36 8 15 35 20 28 36 10 34 35 18 9 -0.06 -132 0 0 35 28 23 6 29 2.7 25 110 -40 35 52 21 35 4 27 35 54 41 35 2 7 -0.06 -131 0 0 35 11 54 6 28 57.6 26 111 -41 35 35 56 34 47 53 35 38 16 34 45 33 -0.06 -130 0 0 34 54 53 6 28 52.3 27 111 -42 35 18 59 34 30 47 35 21 20 34 28 27 -0.06 -129 0 0 34 37 20 6 28 46.9 28 112 -43 35 1 31 34 13 10 35 3 52 34 10 49 -0.06 -128 0 0 34 19 15 6 28 41.2 29 112 -43 34 43 30 33 55 0 34 45 52 33 52 39 -0.06 -127 0 0 34 0 37 6 28 35.4 30 113 -44 34 24 57 33 36 18 34 27 19 33 33 56 -0.07 -126 0 0 33 41 28 6 28 29.4 30 114 -45 34 5 52 33 17 4 34 8 15 33 14 41 -0.07 -125 0 0 33 21 45 6 28 23.1 31 114 -46 33 46 15 32 57 17 33 48 38 32 54 54 -0.07 -124 0 0 33 1 30 6 28 16.7 32 115 -47 33 26 4 32 36 57 33 28 28 32 34 34 -0.07 -123 0 0 32 40 43 6 28 10.1 33 115 -48 33 5 22 32 16 5 33 7 46 32 13 41 -0.07 -122 0 0 32 19 23 6 28 3.2 34 116 -48 32 44 6 31 54 40 32 46 31 31 52 15 -0.07 -121 0 0 31 57 29 6 27 56.2 35 116 -49 32 22 18 31 32 41 32 24 43 31 30 17 -0.07 -120 0 0 31 35 3 6 27 48.9 36 117 -50 31 59 57 31 10 10 32 2 22 31 7 45 -0.07 -119 0 0 31 12 4 6 27 41.4 37 117 -51 31 37 3 30 47 6 31 39 29 30 44 40 -0.07 -118 0 0 30 48 32 6 27 33.8 38 118 -52 31 13 35 30 23 29 31 16 2 30 21 2 -0.07 -117 0 0 30 24 26 6 27 25.9 38 118 -52 30 49 35 29 59 18 30 52 2 29 56 51 -0.07 -116 0 0 29 59 48 6 27 17.7 39 119 -53 30 25 2 29 34 35 30 27 29 29 32 7 -0.07 -115 0 0 29 34 36 6 27 9.4 40 119 -54 29 59 55 29 9 18 30 2 23 29 6 50 -0.07 -114 0 0 29 8 52 6 27 0.8 41 120 -55 29 34 16 28 43 28 29 36 44 28 41 0 -0.07 -113 0 0 28 42 34 6 26 52.0 42 120 -56 29 8 4 28 17 5 29 10 32 28 14 37 -0.07 -112 0 0 28 15 44 6 26 43.0 43 121 -57 28 41 18 27 50 10 28 43 48 27 47 41 -0.07 -111 0 0 27 48 20 6 26 33.8 44 121 -57 28 14 0 27 22 41 28 16 30 27 20 12 -0.07 -110 0 0 27 20 24 6 26 24.3 45 122 -58 27 46 9 26 54 40 27 48 39 26 52 10 -0.07 -109 0 0 26 51 56 6 26 14.6 46 122 -59 27 17 46 26 26 7 27 20 17 26 23 36 -0.07 -108 0 0 26 22 55 6 26 4.7 47 123 -60 26 48 50 25 57 1 26 51 21 25 54 29 -0.07 -107 0 0 25 53 21 6 25 54.6 48 123 -61 26 19 22 25 27 22 26 21 54 25 24 51 -0.07 -106 0 0 25 23 16 6 25 44.2 49 124 -62 25 49 22 24 57 12 25 51 54 24 54 40 -0.07 -105 0 0 24 52 40 6 25 33.6 50 124 -62 25 18 50 24 26 31 25 21 23 24 23 58 -0.07 -104 0 0 24 21 32 6 25 22.7 51 125 -63 24 47 47 23 55 18 24 50 20 23 52 45 -0.07 -103 0 0 23 49 53 6 25 11.7 52 125 -64 24 16 12 23 23 34 24 18 46 23 21 0 -0.07 -102 0 0 23 17 43 6 25 0.4 53 126 -65 23 44 7 22 51 19 23 46 42 22 48 45 -0.07 -101 0 0 22 45 3 6 24 48.8 54 126 -66 23 11 32 22 18 35 23 14 7 22 16 0 -0.07 -100 0 0 22 11 53 6 24 37.1 55 127 -66 22 38 27 21 45 20 22 41 2 21 42 45 -0.07 - 99 0 0 21 38 14 6 24 25.1 56 127 -67 22 4 52 21 11 37 22 7 28 21 9 1 -0.07 - 98 0 0 21 4 6 6 24 12.9 57 128 -68 21 30 48 20 37 24 21 33 25 20 34 48 -0.07 - 97 0 0 20 29 30 6 24 0.5 58 128 -68 20 56 17 20 2 44 20 58 53 20 0 7 -0.07 - 96 0 0 19 54 26 6 23 47.9 59 129 -69 20 21 17 19 27 36 20 23 54 19 24 59 -0.07 - 95 0 0 19 18 55 6 23 35.0 60 129 -70 19 45 50 18 52 0 19 48 27 18 49 23 -0.07 - 94 0 0 18 42 57 6 23 22.0 62 130 -70 19 9 56 18 15 59 19 12 34 18 13 22 -0.07 - 93 0 0 18 6 34 6 23 8.7 63 130 -71 18 33 37 17 39 32 18 36 15 17 36 54 -0.07 - 92 0 0 17 29 46 6 22 55.2 64 131 -72 17 56 52 17 2 40 17 59 31 17 0 2 -0.07 - 91 0 0 16 52 34 6 22 41.6 65 131 -72 17 19 44 16 25 25 17 22 22 16 22 46 -0.07 - 90 0 0 16 14 58 6 22 27.7 66 132 -72 16 42 11 15 47 46 16 44 50 15 45 7 -0.07 - 89 0 0 15 37 0 6 22 13.7 67 132 -73 16 4 17 15 9 44 16 6 56 15 7 5 -0.07 - 88 0 0 14 58 40 6 21 59.5 68 133 -73 15 26 0 14 31 21 15 28 39 14 28 42 -0.06 - 87 0 0 14 20 0 6 21 45.1 69 134 -73 14 47 22 13 52 38 14 50 2 13 49 58 -0.06 - 86 0 0 13 40 59 6 21 30.5 70 134 -74 14 8 25 13 13 35 14 11 5 13 10 55 -0.06 - 85 0 0 13 1 40 6 21 15.8 71 135 -74 13 29 8 12 34 14 13 31 49 12 31 33 -0.06 - 84 0 0 12 22 4 6 21 0.9 72 136 -74 12 49 34 11 54 35 12 52 15 11 51 54 -0.06 - 83 0 0 11 42 10 6 20 45.9 74 137 -74 12 9 43 11 14 39 12 12 24 11 11 58 -0.06 - 82 0 0 11 2 2 6 20 30.7 75 138 -74 11 29 36 10 34 28 11 32 17 10 31 47 -0.06 - 81 0 0 10 21 38 6 20 15.4 76 139 -73 10 49 15 9 54 3 10 51 56 9 51 22 -0.06 - 80 0 0 9 41 2 6 20 0.0 77 140 -73 10 8 40 9 13 25 10 11 21 9 10 43 -0.06 - 79 0 0 9 0 13 6 19 44.5 78 141 -73 9 27 52 8 32 34 9 30 34 8 29 53 -0.06 - 78 0 0 8 19 13 6 19 28.9 79 143 -72 8 46 54 7 51 33 8 49 35 7 48 52 -0.06 - 77 0 0 7 38 3 6 19 13.2 80 145 -72 8 5 45 7 10 23 8 8 27 7 7 41 -0.06 - 76 0 0 6 56 45 6 18 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6 7 34.1 44 293 -25 -22 35 55 -23 26 14 -22 33 28 -23 28 41 -0.04 - 26 0 0 -23 27 5 6 7 24.8 43 293 -24 -23 2 0 -23 52 10 -22 59 34 -23 54 36 -0.04 - 25 0 0 -23 52 32 6 7 15.6 42 293 -23 -23 27 32 -24 17 32 -23 25 6 -24 19 58 -0.04 - 24 0 0 -24 17 26 6 7 6.7 41 292 -22 -23 52 31 -24 42 21 -23 50 5 -24 44 46 -0.04 - 23 0 0 -24 41 46 6 6 58.0 40 292 -21 -24 16 56 -25 6 36 -24 14 31 -25 9 1 -0.04 - 22 0 0 -25 5 33 6 6 49.5 39 291 -20 -24 40 47 -25 30 17 -24 38 23 -25 32 42 -0.04 - 21 0 0 -25 28 46 6 6 41.3 38 291 -19 -25 4 5 -25 53 26 -25 1 41 -25 55 50 -0.04 - 20 0 0 -25 51 25 6 6 33.2 37 291 -18 -25 26 49 -26 16 0 -25 24 26 -26 18 24 -0.04 - 19 0 0 -26 13 30 6 6 25.4 36 290 -17 -25 49 0 -26 38 1 -25 46 36 -26 40 24 -0.04 - 18 0 0 -26 35 3 6 6 17.8 35 290 -17 -26 10 36 -26 59 28 -26 8 14 -27 1 51 -0.04 - 17 0 0 -26 56 1 6 6 10.4 34 289 -16 -26 31 39 -27 20 22 -26 29 17 -27 22 44 -0.04 - 16 0 0 -27 16 26 6 6 3.2 33 289 -15 -26 52 9 -27 40 43 -26 49 47 -27 43 4 -0.04 - 15 0 0 -27 36 17 6 5 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45 6 4 5.9 11 276 7 -32 32 52 -33 18 38 -32 30 38 -33 20 52 -0.05 11 0 0 -33 1 38 6 4 3.8 10 276 8 -32 38 47 -33 24 30 -32 36 33 -33 26 43 -0.05 12 0 0 -33 7 0 6 4 1.9 9 275 9 -32 44 10 -33 29 50 -32 41 57 -33 32 4 -0.06 13 0 0 -33 11 51 6 4 0.2 8 275 10 -32 49 2 -33 34 40 -32 46 49 -33 36 53 -0.06 14 0 0 -33 16 11 6 3 58.7 7 274 11 -32 53 23 -33 38 58 -32 51 10 -33 41 11 -0.06 15 0 0 -33 19 59 6 3 57.3 6 274 11 -32 57 13 -33 42 46 -32 54 59 -33 44 59 -0.06 16 0 0 -33 23 17 6 3 56.1 6 273 12 -33 0 31 -33 46 2 -32 58 18 -33 48 15 -0.06 17 0 0 -33 26 3 6 3 55.0 5 273 13 -33 3 18 -33 48 48 -33 1 5 -33 51 1 -0.06 18 0 0 -33 28 19 6 3 54.2 4 272 14 -33 5 34 -33 51 3 -33 3 21 -33 53 15 -0.06 19 0 0 -33 30 3 6 3 53.4 3 272 15 -33 7 19 -33 52 46 -33 5 6 -33 54 59 -0.06 20 0 0 -33 31 16 6 3 52.9 2 271 15 -33 8 32 -33 53 59 -33 6 19 -33 56 12 -0.07 21 0 0 -33 31 58 6 3 52.5 1 270 16 -33 9 14 -33 54 41 -33 7 1 -33 56 53 -0.07 22 0 0 -33 32 8 6 3 52.3 1 270 17 -33 9 24 -33 54 51 -33 7 12 -33 57 4 -0.09 Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: HIP 66212 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 13 34 15.9511 DE: -00 18 49.117 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 13 34 15.9520 DE: -00 18 49.117 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 7.5 * Diameter [mas]: 0.00 * remarks:close double star Data for the minor planet ------------------------- * general information: (number) name: (17) Thetis asteroid class: approx. diameter [km]: 84 approx. diameter ["]: 0.085 distance from Earth [AU]: 1.35620 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#132 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): 0.013", 0.002", 110.711° remarks: * orbital elements for (17)Thetis : Mean anomaly = 305.8067379794 deg Arg. of pericenter = 135.7187256063 deg Long. of node = 125.5392073083 deg Inclination = 5.5919668896 deg Eccentricity = 0.1325611817 Semimajor axis = 2.4713113407 AU Perihelion dist = 2.1437113891 AU Mag: H = 7.82, G = 0.15 Epoch of elements : MJD 60026.26201389 TDT (2023 Mar 23.2620) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1322023Feb07,10.46,2023,3,23,6.285266,0.031269,0.045045,-3.638871,2.692429,-0.002065,-0.000057,0.000001,-0.000001 -70.8967,-0.4342,87.40,0.94,False HIP 66212,13.57109752,-0.3136436,0.00,7.53,0.00,0.0,0,,13.59110877,-0.4341629,1.18,0.00,1,0,1 17,Thetis,10.91,83.9,1.3562,0,0,-1.574,17.46,,4.2,0 0,305.7403,2023,3,23,135.7187,125.5392,5.5920,0.13256,2.47131,2.14371,7.82,5.0,0.15 1.049,0.0127,0.0024,111,0.0042,Known errors,-1.00,-1,-1,-1 20230323__66212,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org