IOTA/IOTA-ES occultation update for (115) Thyra / UCAC4-617-008307 event on 2022 Dec 31, 19:15 UT Visible from Europe, SW Asia Summary ------- On 2022 Dec 31 UT, the 81.9 km diameter asteroid (115) Thyra will occult a 12.5 mag star in the constellation Perseus for observers along a path across Europe, SW Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.17 mag to 10.60 mag (the magnitude of the asteroid) for at most 11.690 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 Dec 31, 19:00 - 2022 Dec 31, 19:29 * geocentric midpoint of event [JD]: 2459945.30237146 * magnitude of target star: 12.50 * magnitude drop [mag]: 0.17 * estimated maximum duration [s]: 11.690 * Moon: 68 % sunlit, 26° distance * Sun: 129° distance * rough path description: Europe, SW Asia Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 88 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.003", 68°) * approx speed of asteroid's shadow [km/s]: 7.0050 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-617-008307 by 115 Thyra on 2022 Dec 31 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 ' " Longitude Longitude Longitude Longitude 80 34 9 -27 0 0 19 29 35.0 1 308 -39 79 51 25 81 17 31 79 35 20 ... .. .. .... 79 12 22 -26 0 0 19 29 34.4 2 309 -40 78 31 5 79 54 11 78 15 33 80 10 13 -0.33 77 54 46 -25 0 0 19 29 33.1 4 310 -41 77 14 47 78 35 14 76 59 44 78 50 44 -0.37 76 40 57 -24 0 0 19 29 31.2 5 310 -42 76 2 8 77 20 12 75 47 31 77 35 13 -0.39 75 30 33 -23 0 0 19 29 28.7 7 310 -44 74 52 48 76 8 42 74 38 34 76 23 17 -0.40 74 23 15 -22 0 0 19 29 25.6 8 311 -45 73 46 28 75 0 25 73 32 35 75 14 38 -0.40 73 18 49 -21 0 0 19 29 21.9 10 311 -46 72 42 54 73 55 5 72 29 21 74 8 56 -0.41 72 17 0 -20 0 0 19 29 17.7 11 312 -47 71 41 53 72 52 26 71 28 37 73 5 59 -0.41 71 17 36 -19 0 0 19 29 13.1 12 312 -48 70 43 12 71 52 17 70 30 13 72 5 32 -0.42 70 20 26 -18 0 0 19 29 7.9 14 312 -49 69 46 42 70 54 25 69 33 58 71 7 24 -0.42 69 25 20 -17 0 0 19 29 2.3 15 312 -50 68 52 13 69 58 41 68 39 43 70 11 25 -0.42 68 32 9 -16 0 0 19 28 56.3 16 313 -51 67 59 37 69 4 56 67 47 19 69 17 27 -0.42 67 40 47 -15 0 0 19 28 49.9 18 313 -52 67 8 46 68 13 1 66 56 40 68 25 19 -0.42 66 51 6 -14 0 0 19 28 43.0 19 313 -53 66 19 34 67 22 50 66 7 39 67 34 56 -0.42 66 2 59 -13 0 0 19 28 35.8 20 313 -54 65 31 54 66 34 15 65 20 9 66 46 11 -0.42 65 16 20 -12 0 0 19 28 28.1 21 313 -55 64 45 40 65 47 11 64 34 4 65 58 57 -0.43 64 31 5 -11 0 0 19 28 20.1 23 313 -56 64 0 48 65 1 32 63 49 21 65 13 9 -0.43 63 47 8 -10 0 0 19 28 11.8 24 313 -57 63 17 12 64 17 13 63 5 53 64 28 41 -0.43 63 4 24 - 9 0 0 19 28 3.1 25 313 -58 62 34 49 63 34 10 62 23 37 63 45 30 -0.43 62 22 51 - 8 0 0 19 27 54.0 26 313 -58 61 53 33 62 52 17 61 42 29 63 3 30 -0.43 61 42 23 - 7 0 0 19 27 44.7 27 313 -59 61 13 22 62 11 32 61 2 24 62 22 38 -0.43 61 2 57 - 6 0 0 19 27 35.0 29 313 -60 60 34 12 61 31 50 60 23 19 61 42 50 -0.43 60 24 29 - 5 0 0 19 27 25.0 30 313 -61 59 55 59 60 53 8 59 45 12 61 4 2 -0.43 59 46 58 - 4 0 0 19 27 14.7 31 313 -62 59 18 41 60 15 22 59 7 58 60 26 12 -0.43 59 10 19 - 3 0 0 19 27 4.1 32 313 -62 58 42 14 59 38 31 58 31 36 59 49 15 -0.43 58 34 29 - 2 0 0 19 26 53.3 33 313 -63 58 6 36 59 2 30 57 56 2 59 13 10 -0.43 57 59 27 - 1 0 0 19 26 42.1 34 313 -64 57 31 44 58 27 18 57 21 14 58 37 54 -0.43 57 25 10 0 0 0 19 26 30.7 36 312 -64 56 57 36 57 52 51 56 47 9 58 3 24 -0.43 56 51 35 1 0 0 19 26 19.0 37 312 -65 56 24 9 57 19 8 56 13 46 57 29 37 -0.43 Latitude Latitude Latitude Latitude 56 0 0 2 34 35 19 26 0.1 38 312 -66 1 44 5 3 25 46 1 25 5 3 45 23 -0.42 55 0 0 4 28 18 19 25 36.5 41 311 -67 3 36 21 5 20 59 3 16 49 5 41 10 -0.42 54 0 0 6 26 0 19 25 11.3 43 310 -68 5 32 33 7 20 15 5 12 27 7 41 3 -0.42 53 0 0 8 27 40 19 24 44.3 45 309 -68 7 32 40 9 23 31 7 11 59 9 44 57 -0.42 52 0 0 10 33 13 19 24 15.5 47 308 -69 9 36 36 11 30 45 9 15 20 11 52 50 -0.42 51 0 0 12 42 32 19 23 45.1 49 307 -69 11 44 16 13 41 46 11 22 23 14 4 31 -0.41 50 0 0 14 55 24 19 23 12.9 51 305 -69 13 55 27 15 56 23 13 32 58 16 19 50 -0.41 49 0 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40 70 46 54 72 54 24 -0.41 -118 0 0 71 18 4 19 2 10.6 19 38 -5 70 31 4 72 5 31 70 13 20 72 23 39 -0.41 -119 0 0 70 43 59 19 2 6.9 18 37 -4 69 55 57 71 32 29 69 37 50 71 51 2 -0.42 -120 0 0 70 7 51 19 2 3.3 18 36 -4 69 18 46 70 57 28 69 0 16 71 16 26 -0.42 -121 0 0 69 29 34 19 1 59.5 17 35 -3 68 39 24 70 20 18 68 20 29 70 39 42 -0.42 -122 0 0 68 48 59 19 1 55.7 16 34 -3 67 57 42 69 40 51 67 38 23 70 0 42 -0.42 -123 0 0 68 5 55 19 1 52.0 15 33 -2 67 13 32 68 58 57 66 53 48 69 19 16 -0.42 -124 0 0 67 20 15 19 1 48.2 15 32 -1 66 26 43 68 14 28 66 6 34 68 35 14 -0.43 -125 0 0 66 31 48 19 1 44.4 14 31 -1 65 37 8 67 27 12 65 16 34 67 48 26 -0.43 -126 0 0 65 40 25 19 1 40.6 13 30 0 64 44 37 66 37 1 64 23 37 66 58 43 -0.43 -127 0 0 64 45 55 19 1 37.0 12 30 1 63 48 59 65 43 42 63 27 35 66 5 52 -0.44 -128 0 0 63 48 10 19 1 33.4 11 29 1 62 50 8 64 47 6 62 28 19 65 9 44 -0.44 -129 0 0 62 46 59 19 1 30.0 10 28 2 61 47 53 63 47 4 61 25 41 64 10 8 -0.45 -130 0 0 61 42 15 19 1 26.8 8 27 3 60 42 6 62 43 25 60 19 32 63 6 55 -0.46 -131 0 0 60 33 49 19 1 23.9 7 26 4 59 32 42 61 36 1 59 9 47 61 59 56 -0.47 -132 0 0 59 21 35 19 1 21.3 6 25 5 58 19 34 60 24 44 57 56 19 60 49 2 -0.49 -133 0 0 58 5 28 19 1 19.2 4 24 6 57 2 39 59 9 30 56 39 6 59 34 9 -0.51 -134 0 0 56 45 26 19 1 17.5 3 23 7 55 41 54 57 50 14 55 18 6 58 15 11 -0.57 -135 0 0 55 21 27 19 1 16.4 2 22 8 54 17 20 56 26 54 53 53 18 56 52 7 -0.73 -136 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 54 59 32 .. .. .. 55 24 58 .... Uncertainty in time = +/- 2 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: UCAC4-617-008307 * constellation : Perseus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 02 52 09.0450 DE: +33 13 47.498 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 02 52 09.0450 DE: +33 13 47.498 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (115) Thyra asteroid class: approx. diameter [km]: 82 approx. diameter ["]: 0.095 distance from Earth [AU]: 1.18260 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#96 date of fit: 2022 Nov 26 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): 0.019", 0.003", 67.975° remarks: * orbital elements for (115)Thyra : Mean anomaly = 18.2302092824 deg Arg. of pericenter = 96.7954827719 deg Long. of node = 308.7750026402 deg Inclination = 11.5878593879 deg Eccentricity = 0.1927150567 Semimajor axis = 2.3794299937 AU Perihelion dist = 1.9208780076 AU Mag: H = 7.68, G = 0.12 Epoch of elements : MJD 59944.80263889 TDT (2022 Dec 31.8026) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#962022Nov26,11.69,2022,12,31,19.256915,0.287745,0.209015,2.323590,-3.199014,0.004233,0.000318,0.000001,0.000001 14.3421,33.3259,-108.07,-23.05,False UCAC4-617-008307,2.86917920,33.2298606,0.00,12.50,0.00,0.0,0,,2.89264468,33.3258592,0.17,0.00,0,0,0 115,Thyra,10.60,81.9,1.1826,0,0,1.380,-23.78,,4.2,0 0,18.0147,2022,12,31,96.7955,308.7750,11.5879,0.19272,2.37943,1.92088,7.68,5.0,0.15 1.190,0.0187,0.0031,68,0.0181,Known errors,-1.00,-1,-1,-1 20221231_008307,59914.09 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org