IOTA/IOTA-ES occultation update for (73) Klytia / UCAC4 329-183944 event on 2024 Oct 29, 07:49 UT Visible from Summary ------- On 2024 Oct 29 UT, the 45.20134767608 km diameter asteroid (73) Klytia will occult a 11.3 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.29 mag to 14.49 mag (the magnitude of the asteroid) for at most 1.700 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: 2024 Oct 29, 07:45 - 2024 Oct 29, 07:53 * geocentric midpoint of event [JD]: 2460612.82596275 * magnitude of target star: 11.25 * magnitude drop [mag]: 3.29 * estimated maximum duration [s]: 1.700 * Moon: 9 % sunlit, 105° distance * Sun: 71° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 46 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.009, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.009", 0.002", 82°) * approx speed of asteroid's shadow [km/s]: 26.7437 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 329-183944 by 73 Klytia on 2024 Oct 29 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 44 0 0 - 2 44 36 7 45 26.6 0 114 71 - 2 58 11 - 2 31 0 - 3 0 57 - 2 28 14 .... 45 0 0 - 3 11 33 7 45 26.7 2 114 72 - 3 25 7 - 2 57 58 - 3 27 52 - 2 55 12 0.01 46 0 0 - 3 38 15 7 45 26.9 3 114 73 - 3 51 48 - 3 24 41 - 3 54 33 - 3 21 56 -0.04 47 0 0 - 4 4 42 7 45 27.1 4 114 74 - 4 18 14 - 3 51 9 - 4 20 59 - 3 48 24 -0.06 48 0 0 - 4 30 53 7 45 27.5 5 114 75 - 4 44 24 - 4 17 22 - 4 47 8 - 4 14 37 -0.08 49 0 0 - 4 56 47 7 45 27.9 6 114 76 - 5 10 17 - 4 43 18 - 5 13 1 - 4 40 33 -0.08 50 0 0 - 5 22 25 7 45 28.4 7 114 77 - 5 35 53 - 5 8 56 - 5 38 37 - 5 6 12 -0.09 51 0 0 - 5 47 45 7 45 29.0 8 114 78 - 6 1 12 - 5 34 18 - 6 3 55 - 5 31 34 -0.09 52 0 0 - 6 12 47 7 45 29.7 9 114 79 - 6 26 12 - 5 59 21 - 6 28 55 - 5 56 37 -0.10 53 0 0 - 6 37 30 7 45 30.4 10 113 80 - 6 50 54 - 6 24 5 - 6 53 37 - 6 21 22 -0.10 54 0 0 - 7 1 54 7 45 31.3 11 113 81 - 7 15 16 - 6 48 31 - 7 17 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38 15 39 38 0.03 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 329-183944 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 15 21.2919 DE: -24 15 19.820 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 15 21.2918 DE: -24 15 19.820 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.3 * B mag [mag]: 11.9 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (73) Klytia asteroid class: approx. diameter [km]: 45 approx. diameter ["]: 0.022 distance from Earth [AU]: 2.86310 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#60 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): 0.009", 0.002", 82.426° remarks: * orbital elements for (73)Klytia : Mean anomaly = 248.6440387790 deg Arg. of pericenter = 56.3592313504 deg Long. of node = 6.8346812426 deg Inclination = 2.3694351615 deg Eccentricity = 0.0422510127 Semimajor axis = 2.6645122465 AU Perihelion dist = 2.5519339058 AU Mag: H = 9.03, G = 0.15 Epoch of elements : MJD 60612.32596245 TDT (2024 Oct 29.3260) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#602023Apr24,1.70,2024,10,29,7.823106,-0.021739,0.122571,14.868739,2.603021,0.005483,0.000660,0.000000,0.000000 133.7278,-24.2134,58.58,-13.65,False UCAC4 329-183944,19.25591445,-24.2555055,11.91,11.25,10.89,0.1,0,,19.28087156,-24.2134363,3.29,3.20,0,0,0 73,Klytia,14.49,45.409,2.8631,0,0,3.338,8.00,,2.4,0 0,248.5702,2024,10,29,56.3592,6.8347,2.3694,0.04225,2.66451,2.55193,9.03,5.0,0.15 1.101,0.0093,0.0022,82,0.0022,Known errors,0.78,0,-1,-1 20241029_183944,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org