IOTA/IOTA-ES occultation update for (169) Zelia / UCAC4 302-157404 event on 2024 Sep 04, 17:49 UT Visible from Summary ------- On 2024 Sep 04 UT, the 36.327 km diameter asteroid (169) Zelia will occult a 11.5 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 2.01 mag to 13.32 mag (the magnitude of the asteroid) for at most 3.350 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 Sep 04, 17:40 - 2024 Sep 04, 17:59 * geocentric midpoint of event [JD]: 2460558.24304591 * magnitude of target star: 11.50 * magnitude drop [mag]: 2.01 * estimated maximum duration [s]: 3.350 * Moon: 2 % sunlit, 90° distance * Sun: 107° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 37 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.027, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.003", 91°) * approx speed of asteroid's shadow [km/s]: 10.8321 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 302-157404 by 169 Zelia on 2024 Sep 4 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 - 83 0 0 -22 33 57 17 40 18.5 0 122 61 -22 45 49 -22 22 6 -22 52 6 -22 15 50 .... - 82 0 0 -23 9 1 17 40 18.7 1 122 60 -23 20 51 -22 57 12 -23 27 8 -22 50 56 0.24 - 81 0 0 -23 43 41 17 40 19.1 2 121 59 -23 55 29 -23 31 53 -24 1 45 -23 25 38 0.22 - 80 0 0 -24 17 55 17 40 19.7 4 121 59 -24 29 42 -24 6 9 -24 35 57 -23 59 55 0.21 - 79 0 0 -24 51 44 17 40 20.5 5 121 58 -25 3 29 -24 39 59 -25 9 43 -24 33 46 0.20 - 78 0 0 -25 25 6 17 40 21.5 6 120 57 -25 36 50 -25 13 23 -25 43 3 -25 7 11 0.20 - 77 0 0 -25 58 1 17 40 22.7 7 120 56 -26 9 43 -25 46 20 -26 15 55 -25 40 9 0.20 - 76 0 0 -26 30 28 17 40 24.1 8 119 56 -26 42 8 -26 18 49 -26 48 18 -26 12 38 0.20 - 75 0 0 -27 2 26 17 40 25.7 9 119 55 -27 14 4 -26 50 49 -27 20 14 -26 44 40 0.19 - 74 0 0 -27 33 56 17 40 27.5 10 118 54 -27 45 31 -27 22 20 -27 51 40 -27 16 12 0.19 - 73 0 0 -28 4 55 17 40 29.4 11 118 53 -28 16 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Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.5 Data for the target star ------------------------ * name: UCAC4 302-157404 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 57 04.0882 DE: -29 40 51.004 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 57 04.0880 DE: -29 40 51.004 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.5 * B mag [mag]: 11.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (169) Zelia asteroid class: approx. diameter [km]: 36 approx. diameter ["]: 0.032 distance from Earth [AU]: 1.56000 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#54 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): 0.027", 0.003", 91.176° remarks: * orbital elements for (169)Zelia : Mean anomaly = 334.7355609648 deg Arg. of pericenter = 334.8078362677 deg Long. of node = 354.7195447920 deg Inclination = 5.5000454027 deg Eccentricity = 0.1302353498 Semimajor axis = 2.3583696347 AU Perihelion dist = 2.0512265403 AU Mag: H = 9.53, G = 0.15 Epoch of elements : MJD 60557.74304554 TDT (2024 Sep 04.7430) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,3.35,2024,9,4,17.833102,0.046565,-0.157884,5.865346,1.725673,0.005060,0.000155,0.000000,0.000000 17.8267,-29.6854,-87.80,6.80,False UCAC4 302-157404,17.95113563,-29.6808344,11.77,11.50,11.35,0.0,0,,17.97751826,-29.6853767,2.01,1.76,0,0,0 169,Zelia,13.32,36.327,1.5600,0,0,2.538,9.73,,2.2,0 0,334.5334,2024,9,4,334.8078,354.7195,5.5000,0.13024,2.35837,2.05123,9.53,5.0,0.15 1.265,0.0270,0.0026,91,0.0085,Known errors,0.82,0,-1,-1 20240904_157404,60140.54 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 12:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org