IOTA/IOTA-ES occultation update for (169) Zelia / UCAC4 305-187882 event on 2024 Sep 12, 15:49 UT Visible from Summary ------- On 2024 Sep 12 UT, the 36.2503842769325 km diameter asteroid (169) Zelia will occult a 11.4 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 2.17 mag to 13.45 mag (the magnitude of the asteroid) for at most 2.690 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 12, 15:41 - 2024 Sep 12, 15:57 * geocentric midpoint of event [JD]: 2460566.15935304 * magnitude of target star: 11.44 * magnitude drop [mag]: 2.17 * estimated maximum duration [s]: 2.690 * Moon: 65 % sunlit, 6° distance * Sun: 101° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 37 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.003", 90°) * approx speed of asteroid's shadow [km/s]: 13.5909 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 305-187882 by 169 Zelia on 2024 Sep 12 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 - 59 0 0 -22 53 32 15 41 50.0 0 122 63 -23 5 32 -22 41 32 -23 10 43 -22 36 22 .... - 58 0 0 -23 27 56 15 41 50.2 1 121 63 -23 39 56 -23 15 57 -23 45 5 -23 10 48 0.27 - 57 0 0 -24 2 0 15 41 50.5 2 121 62 -24 13 58 -23 50 2 -24 19 7 -23 44 54 0.26 - 56 0 0 -24 35 43 15 41 50.9 3 121 62 -24 47 40 -24 23 46 -24 52 48 -24 18 38 0.25 - 55 0 0 -25 9 4 15 41 51.6 4 120 61 -25 21 0 -24 57 9 -25 26 8 -24 52 1 0.25 - 54 0 0 -25 42 2 15 41 52.4 6 120 60 -25 53 56 -25 30 8 -25 59 4 -25 25 2 0.24 - 53 0 0 -26 14 37 15 41 53.3 7 119 60 -26 26 30 -26 2 45 -26 31 36 -25 57 39 0.24 - 52 0 0 -26 46 48 15 41 54.4 8 119 59 -26 58 39 -26 34 57 -27 3 45 -26 29 52 0.24 - 51 0 0 -27 18 34 15 41 55.7 9 118 59 -27 30 23 -27 6 45 -27 35 29 -27 1 40 0.24 - 50 0 0 -27 49 54 15 41 57.1 10 118 58 -28 1 42 -27 38 7 -28 6 47 -27 33 3 0.24 - 49 0 0 -28 20 49 15 41 58.6 11 117 57 -28 32 35 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0.27 123 0 0 - 2 44 30 15 57 2.0 8 241 -87 - 2 56 24 - 2 32 36 - 3 1 32 - 2 27 29 0.28 124 0 0 - 2 8 27 15 57 3.3 7 241 -85 - 2 20 20 - 1 56 35 - 2 25 27 - 1 51 29 0.28 125 0 0 - 1 32 45 15 57 4.3 6 241 -84 - 1 44 36 - 1 20 55 - 1 49 42 - 1 15 50 0.29 126 0 0 - 0 57 24 15 57 5.1 4 241 -83 - 1 9 13 - 0 45 35 - 1 14 18 - 0 40 31 0.31 127 0 0 - 0 22 24 15 57 5.8 3 241 -82 - 0 34 11 - 0 10 37 - 0 39 15 - 0 5 33 0.33 128 0 0 0 12 14 15 57 6.2 2 241 -81 0 0 29 0 23 59 - 0 4 35 0 29 1 0.39 129 0 0 0 46 28 15 57 6.5 1 241 -80 0 34 45 0 58 11 0 29 42 1 3 13 0.57 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 305-187882 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 05 56.6826 DE: -29 10 19.280 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 05 56.6826 DE: -29 10 19.280 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.4 * B mag [mag]: 13.1 * Diameter [mas]: 0.30 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (169) Zelia asteroid class: approx. diameter [km]: 36 approx. diameter ["]: 0.030 distance from Earth [AU]: 1.63900 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): 0.026", 0.003", 89.839° remarks: * orbital elements for (169)Zelia : Mean anomaly = 336.8887928159 deg Arg. of pericenter = 334.8090530625 deg Long. of node = 354.7193873117 deg Inclination = 5.5000553737 deg Eccentricity = 0.1302302991 Semimajor axis = 2.3583546632 AU Perihelion dist = 2.0512254300 AU Mag: H = 9.53, G = 0.15 Epoch of elements : MJD 60565.65935263 TDT (2024 Sep 12.6594) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,2.69,2024,9,12,15.824473,0.050883,-0.208423,7.450524,1.826244,0.005173,0.000171,0.000000,0.000000 42.3708,-29.1712,-58.35,3.81,False UCAC4 305-187882,18.09907853,-29.1720223,13.10,11.44,10.54,0.3,0,,18.12533130,-29.1711575,2.17,2.56,0,0,0 169,Zelia,13.45,36.607,1.6390,0,0,3.053,9.80,,2.2,0 0,336.7094,2024,9,12,334.8091,354.7194,5.5001,0.13023,2.35835,2.05123,9.53,5.0,0.15 1.215,0.0260,0.0026,90,0.0066,Known errors,0.57,0,-1,-1 20240912_187882,60140.56 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org