IOTA/IOTA-ES occultation update for (1473) Ounas / TYC 5716-00235-1 event on 2024 Nov 25, 11:49 UT Visible from Summary ------- On 2024 Nov 25 UT, the 17.974 km diameter asteroid (1473) Ounas will occult a 10.6 mag star in the constellation Aquila for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.87 mag to 16.44 mag (the magnitude of the asteroid) for at most 0.430 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: 2024 Nov 25, 11:47 - 2024 Nov 25, 11:52 * geocentric midpoint of event [JD]: 2460639.99286758 * magnitude of target star: 10.57 * magnitude drop [mag]: 5.87 * estimated maximum duration [s]: 0.430 * Moon: 28 % sunlit, 109° distance * Sun: 46° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 18 * 1 sigma uncertainty interval [path widths]: +/- 0.26 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 79°) * approx speed of asteroid's shadow [km/s]: 41.9303 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5716-00235-1 by 1473 Ounas on 2024 Nov 25 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. 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Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 5716-00235-1 * constellation : Aquila * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 14 39.2573 DE: -11 33 38.949 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 14 39.2572 DE: -11 33 38.950 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.6 * B mag [mag]: 10.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1473) Ounas asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.010 distance from Earth [AU]: 2.59690 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#47 date of fit: 2023 Apr 24 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): 0.016", 0.002", 79.081° remarks: * orbital elements for (1473)Ounas : Mean anomaly = 337.4804786845 deg Arg. of pericenter = 129.3481513959 deg Long. of node = 216.4550366093 deg Inclination = 13.6454994465 deg Eccentricity = 0.2367663777 Semimajor axis = 2.5748975239 AU Perihelion dist = 1.9652483642 AU Mag: H = 11.80, G = 0.15 Epoch of elements : MJD 60639.49286729 TDT (2024 Nov 25.4929) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#472023Apr24,0.43,2024,11,25,11.828822,0.004731,-0.080564,23.618880,1.502940,0.003796,0.001225,-0.000001,0.000000 46.6565,-11.5183,-0.65,-20.89,False TYC 5716-00235-1,19.24423821,-11.5608188,10.87,10.57,10.41,0.0,0,,19.26698208,-11.5182592,5.87,5.58,0,0,0 1473,Ounas,16.44,17.974,2.5969,0,0,5.442,5.09,,1.2,0 0,337.3629,2024,11,25,129.3482,216.4550,13.6455,0.23677,2.57490,1.96525,11.80,5.0,0.15 1.262,0.0157,0.0015,79,0.0025,Known errors,0.99,0,-1,-1 20241125_0235-1,60140.71 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:08 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org