IOTA/IOTA-ES occultation update for (115) Thyra / UCAC4-618-008296 event on 2022 Dec 30, 02:02 UT Visible from E Canada, E USA, South America Summary ------- On 2022 Dec 30 UT, the 81.9 km diameter asteroid (115) Thyra will occult a 11.3 mag star in the constellation Perseus for observers along a path across E Canada, E USA, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.43 mag to 10.55 mag (the magnitude of the asteroid) for at most 12.070 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 30, 01:47 - 2022 Dec 30, 02:18 * geocentric midpoint of event [JD]: 2459943.58540883 * magnitude of target star: 11.34 * magnitude drop [mag]: 0.43 * estimated maximum duration [s]: 12.070 * Moon: 50 % sunlit, 46° distance * Sun: 130° distance * rough path description: E Canada, E USA, South America Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 84 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 0.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.004", 68°) * approx speed of asteroid's shadow [km/s]: 6.7831 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-618-008296 by 115 Thyra on 2022 Dec 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 ' " Longitude Longitude Longitude Longitude .. .. .. -36 0 0 .. .. .... .. .. .. - 28 34 19 ... .. .. - 28 50 26 ... .. .. .... - 29 11 2 -35 0 0 2 18 10.3 1 313 -32 - 29 51 22 - 28 30 16 - 30 6 58 - 28 14 16 .... - 30 25 28 -34 0 0 2 18 9.6 2 314 -33 - 31 4 33 - 29 45 59 - 31 19 40 - 29 30 29 -0.26 - 31 36 15 -33 0 0 2 18 8.3 4 315 -34 - 32 14 13 - 30 57 56 - 32 28 55 - 30 42 54 -0.27 - 32 43 45 -32 0 0 2 18 6.5 5 315 -35 - 33 20 41 - 32 6 29 - 33 34 59 - 31 51 52 -0.28 - 33 48 14 -31 0 0 2 18 4.1 7 316 -36 - 34 24 14 - 33 11 55 - 34 38 10 - 32 57 42 -0.28 - 34 49 56 -30 0 0 2 18 1.3 8 316 -37 - 35 25 4 - 34 14 31 - 35 38 41 - 34 0 38 -0.29 - 35 49 5 -29 0 0 2 17 58.0 9 317 -38 - 36 23 26 - 35 14 29 - 36 36 45 - 35 0 56 -0.29 - 36 45 53 -28 0 0 2 17 54.2 11 317 -39 - 37 19 31 - 36 12 2 - 37 32 33 - 35 58 46 -0.29 - 37 40 30 -27 0 0 2 17 50.0 12 318 -40 - 38 13 27 - 37 7 20 - 38 26 14 - 36 54 21 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34 3 62 42 0 64 13 22 62 24 20 64 31 19 -0.30 137 0 0 62 39 52 1 48 7.8 11 33 3 61 53 23 63 26 39 61 35 21 63 44 58 -0.30 136 0 0 61 49 32 1 48 4.7 10 32 4 61 2 6 62 37 18 60 43 43 62 56 0 -0.31 135 0 0 60 56 24 1 48 1.8 9 31 5 60 8 1 61 45 9 59 49 15 62 4 15 -0.31 134 0 0 60 0 20 1 47 59.1 8 30 5 59 10 58 60 50 4 58 51 51 61 9 33 -0.32 133 0 0 59 1 9 1 47 56.5 7 29 6 58 10 50 59 51 54 57 51 20 60 11 47 -0.32 132 0 0 57 58 45 1 47 54.3 6 28 7 57 7 28 58 50 28 56 47 36 59 10 45 -0.34 131 0 0 56 52 57 1 47 52.3 5 27 8 56 0 44 57 45 40 55 40 31 58 6 20 -0.35 130 0 0 55 43 39 1 47 50.8 3 27 9 54 50 30 56 37 19 54 29 56 56 58 22 -0.38 129 0 0 54 30 43 1 47 49.6 2 26 10 53 36 41 55 25 18 53 15 47 55 46 44 -0.46 128 0 0 53 14 4 1 47 49.0 1 25 11 .. .. .. 54 9 32 .. .. .. 54 31 18 -0.90 127 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 53 12 0 .... Uncertainty in time = +/- 2 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: UCAC4-618-008296 * constellation : Perseus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 02 51 15.6132 DE: +33 30 22.402 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 02 51 15.6131 DE: +33 30 22.402 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (2.000,1.400) * V mag [mag]: 11.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (115) Thyra asteroid class: approx. diameter [km]: 82 approx. diameter ["]: 0.097 distance from Earth [AU]: 1.16810 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", 67.876° remarks: * orbital elements for (115)Thyra : Mean anomaly = 17.7690426080 deg Arg. of pericenter = 96.7953336361 deg Long. of node = 308.7750291975 deg Inclination = 11.5878558466 deg Eccentricity = 0.1927162934 Semimajor axis = 2.3794330341 AU Perihelion dist = 1.9208775194 AU Mag: H = 7.68, G = 0.12 Epoch of elements : MJD 59943.08513889 TDT (2022 Dec 30.0851) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#962022Nov26,12.07,2022,12,30,2.049812,0.205912,0.127157,2.011480,-3.257587,0.004158,0.000247,0.000001,0.000001 -86.0812,33.6026,149.83,-23.18,False UCAC4-618-008296,2.85433702,33.5062229,0.00,11.34,0.00,0.0,0,,2.87783220,33.6025802,0.43,0.00,0,0,0 115,Thyra,10.55,81.9,1.1681,0,0,1.214,-24.52,,4.2,0 0,17.7462,2022,12,30,96.7953,308.7750,11.5879,0.19272,2.37943,1.92088,7.68,5.0,0.15 1.195,0.0191,0.0035,68,0.0188,Known errors,-1.00,-1,-1,-1 20221230_008296,59914.09 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:06 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org