IOTA/IOTA-ES occultation update for (161) Athor / TYC 6771-01189-1 event on 2023 Apr 27, 19:22 UT Visible from Australia Summary ------- On 2023 Apr 27 UT, the 42.6 km diameter asteroid (161) Athor will occult a 9.2 mag star in the constellation Libra 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 2.32 mag to 11.36 mag (the combined magnitude of the asteroid and the close companion star) for at most 4.740 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: 2023 Apr 27, 19:10 - 2023 Apr 27, 19:33 * geocentric midpoint of event [JD]: 2460062.30713196 * magnitude of target star: 9.18 * magnitude drop [mag]: 2.32 * estimated maximum duration [s]: 4.740 * Moon: 49 % sunlit, 111° distance * Sun: 160° distance * rough path description: Australia Additional comments ------------------- close double star The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 110°) * approx speed of asteroid's shadow [km/s]: 8.9965 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6771-01189-1 by 161 Athor on 2023 Apr 27 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 - 18 0 0 -22 22 28 19 33 43.8 1 119 -11 -22 8 58 -22 35 59 -22 4 35 -22 40 23 .... - 17 0 0 -22 53 4 19 33 43.5 2 118 -12 -22 39 35 -23 6 34 -22 35 12 -23 10 57 0.25 - 16 0 0 -23 23 21 19 33 42.9 3 118 -13 -23 9 53 -23 36 50 -23 5 31 -23 41 12 0.24 - 15 0 0 -23 53 19 19 33 42.0 4 117 -14 -23 39 53 -24 6 47 -23 35 31 -24 11 9 0.24 - 14 0 0 -24 22 58 19 33 41.0 5 117 -15 -24 9 33 -24 36 24 -24 5 11 -24 40 46 0.23 - 13 0 0 -24 52 17 19 33 39.7 6 117 -16 -24 38 53 -25 5 42 -24 34 32 -25 10 3 0.23 - 12 0 0 -25 21 15 19 33 38.2 7 116 -17 -25 7 53 -25 34 39 -25 3 32 -25 39 0 0.23 - 11 0 0 -25 49 53 19 33 36.5 8 116 -18 -25 36 32 -26 3 15 -25 32 12 -26 7 35 0.23 - 10 0 0 -26 18 9 19 33 34.5 9 115 -18 -26 4 49 -26 31 29 -26 0 30 -26 35 49 0.23 - 9 0 0 -26 46 3 19 33 32.4 10 115 -19 -26 32 45 -26 59 22 -26 28 26 -27 3 42 0.23 - 8 0 0 -27 13 35 19 33 30.0 11 114 -20 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Uncertainty in time = +/- 1 secs Prediction of 2023 Mar 1.1 Data for the target star ------------------------ * name: TYC 6771-01189-1 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 25 30.0795 DE: -26 37 24.335 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 25 30.0796 DE: -26 37 24.337 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 9.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (161) Athor asteroid class: approx. diameter [km]: 43 approx. diameter ["]: 0.044 distance from Earth [AU]: 1.33950 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#105 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", 110.22° remarks: * orbital elements for (161)Athor : Mean anomaly = 290.0061884584 deg Arg. of pericenter = 294.8600873932 deg Long. of node = 18.5502017012 deg Inclination = 9.0576053152 deg Eccentricity = 0.1368575363 Semimajor axis = 2.3798997730 AU Perihelion dist = 2.0541925535 AU Mag: H = 9.18, G = 0.13 Epoch of elements : MJD 60061.80708333 TDT (2023 Apr 27.8071) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1052023Feb07,4.74,2023,4,27,19.371167,0.044269,-0.235910,-4.989912,-0.941074,-0.001502,0.001095,0.000001,0.000000 85.6404,-26.7062,-111.15,13.94,False TYC 6771-01189-1,15.42502208,-26.6234264,0.00,9.18,0.00,0.0,0,,15.44848412,-26.7062010,3.13,0.00,0,0,0 161,Athor,12.24,42.6,1.3395,0,0,-2.445,-6.18,,2.4,0 0,289.7895,2023,4,27,294.8601,18.5502,9.0576,0.13686,2.37990,2.05419,9.20,5.0,0.15 1.162,0.0133,0.0023,110,0.0071,Known errors,-1.00,-1,-1,-1 20230427_1189-1,60004.06 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Mar 01, 01:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org