IOTA/IOTA-ES occultation update for (169) Zelia / TYC 6880-02029-1 event on 2024 Oct 31, 01:37 UT Visible from Summary ------- On 2024 Oct 31 UT, the 36.369 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 2.69 mag to 13.97 mag (the magnitude of the asteroid) for at most 1.240 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 Oct 31, 01:34 - 2024 Oct 31, 01:40 * geocentric midpoint of event [JD]: 2460614.56759446 * magnitude of target star: 11.37 * magnitude drop [mag]: 2.69 * estimated maximum duration [s]: 1.240 * Moon: 2 % sunlit, 87° distance * Sun: 72° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 41 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.020, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.002", 79°) * approx speed of asteroid's shadow [km/s]: 29.3514 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6880-02029-1 by 169 Zelia on 2024 Oct 31 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 119 0 0 -36 49 19 1 34 6.9 1 121 53 -37 2 23 -36 36 16 -37 5 27 -36 33 13 .... 120 0 0 -37 19 9 1 34 7.0 2 121 53 -37 32 12 -37 6 7 -37 35 16 -37 3 4 0.49 121 0 0 -37 48 38 1 34 7.1 3 120 54 -38 1 40 -37 35 38 -38 4 44 -37 32 36 0.50 122 0 0 -38 17 48 1 34 7.3 4 120 54 -38 30 48 -38 4 49 -38 33 52 -38 1 46 0.50 123 0 0 -38 46 35 1 34 7.6 4 119 54 -38 59 35 -38 33 38 -39 2 38 -38 30 36 0.51 124 0 0 -39 15 2 1 34 8.0 5 118 55 -39 28 0 -39 2 5 -39 31 2 -38 59 3 0.51 125 0 0 -39 43 5 1 34 8.4 6 118 55 -39 56 2 -39 30 11 -39 59 4 -39 27 9 0.51 126 0 0 -40 10 46 1 34 8.8 7 117 55 -40 23 42 -39 57 53 -40 26 43 -39 54 52 0.51 127 0 0 -40 38 4 1 34 9.3 8 116 56 -40 50 58 -40 25 13 -40 53 59 -40 22 12 0.51 128 0 0 -41 4 59 1 34 9.9 9 116 56 -41 17 51 -40 52 9 -41 20 52 -40 49 8 0.51 129 0 0 -41 31 29 1 34 10.5 10 115 56 -41 44 19 -41 18 41 -41 47 20 -41 15 41 0.51 130 0 0 -41 57 35 1 34 11.1 11 114 56 -42 10 24 -41 44 49 -42 13 24 -41 41 49 0.51 131 0 0 -42 23 17 1 34 11.9 11 114 56 -42 36 3 -42 10 32 -42 39 3 -42 7 33 0.51 132 0 0 -42 48 34 1 34 12.6 12 113 56 -43 1 18 -42 35 51 -43 4 18 -42 32 52 0.51 133 0 0 -43 13 25 1 34 13.4 13 112 57 -43 26 8 -43 0 44 -43 29 7 -42 57 46 0.51 134 0 0 -43 37 52 1 34 14.2 14 112 57 -43 50 32 -43 25 13 -43 53 31 -43 22 15 0.51 135 0 0 -44 1 52 1 34 15.1 15 111 57 -44 14 31 -43 49 15 -44 17 29 -43 46 18 0.51 136 0 0 -44 25 28 1 34 16.1 16 110 57 -44 38 4 -44 12 53 -44 41 2 -44 9 56 0.51 137 0 0 -44 48 37 1 34 17.0 16 109 57 -45 1 11 -44 36 4 -45 4 9 -44 33 8 0.51 138 0 0 -45 11 21 1 34 18.0 17 109 57 -45 23 53 -44 58 50 -45 26 50 -44 55 54 0.51 139 0 0 -45 33 38 1 34 19.1 18 108 57 -45 46 8 -45 21 10 -45 49 5 -45 18 15 0.51 140 0 0 -45 55 30 1 34 20.1 19 107 57 -46 7 58 -45 43 4 -46 10 54 -45 40 9 0.51 141 0 0 -46 16 56 1 34 21.2 20 106 57 -46 29 21 -46 4 32 -46 32 17 -46 1 38 0.51 142 0 0 -46 37 56 1 34 22.4 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-17 0 13 -16 34 50 -17 3 12 -16 31 52 0.56 - 46 0 0 -16 15 46 1 40 30.6 9 246 -55 -16 28 26 -16 3 8 -16 31 25 -16 0 10 0.57 - 45 0 0 -15 44 19 1 40 31.3 8 246 -56 -15 56 57 -15 31 43 -15 59 55 -15 28 46 0.57 - 44 0 0 -15 13 11 1 40 31.9 7 246 -57 -15 25 47 -15 0 37 -15 28 44 -14 57 40 0.58 - 43 0 0 -14 42 22 1 40 32.5 6 245 -58 -14 54 56 -14 29 50 -14 57 53 -14 26 54 0.59 - 42 0 0 -14 11 53 1 40 32.9 5 245 -59 -14 24 25 -13 59 23 -14 27 21 -13 56 28 0.61 - 41 0 0 -13 41 45 1 40 33.3 4 245 -60 -13 54 14 -13 29 18 -13 57 10 -13 26 23 0.64 - 40 0 0 -13 11 59 1 40 33.6 3 245 -61 -13 24 26 -12 59 34 -13 27 21 -12 56 39 0.68 - 39 0 0 -12 42 35 1 40 33.7 2 245 -61 -12 55 0 -12 30 12 -12 57 55 -12 27 18 0.79 - 38 0 0 -12 13 35 1 40 33.8 1 244 -62 -12 25 57 -12 1 14 -12 28 52 -11 58 20 1.29 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 6880-02029-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 25 51.0205 DE: -25 16 11.308 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 25 51.0204 DE: -25 16 11.309 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.4 * B mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (169) Zelia asteroid class: approx. diameter [km]: 36 approx. diameter ["]: 0.023 distance from Earth [AU]: 2.14230 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): 0.021", 0.002", 79.437° remarks: * orbital elements for (169)Zelia : Mean anomaly = 350.0563013686 deg Arg. of pericenter = 334.8169711089 deg Long. of node = 354.7185784866 deg Inclination = 5.5001291655 deg Eccentricity = 0.1301978547 Semimajor axis = 2.3582587741 AU Perihelion dist = 2.0512185408 AU Mag: H = 9.53, G = 0.15 Epoch of elements : MJD 60614.06759454 TDT (2024 Oct 31.0676) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,1.24,2024,10,31,1.622267,0.108005,-0.440599,16.087548,3.955666,0.005135,0.000671,-0.000001,0.000000 -132.3504,-25.2219,151.57,-14.22,False TYC 6880-02029-1,19.43083907,-25.2698078,11.96,11.37,11.05,0.0,0,,19.45592286,-25.2219069,2.70,2.58,0,0,0 169,Zelia,13.97,36.369,2.1423,0,0,4.867,16.25,,2.2,0 0,349.7657,2024,10,30,334.8170,354.7186,5.5001,0.13020,2.35826,2.05122,9.53,5.0,0.15 1.117,0.0207,0.0025,79,0.0027,Known errors,1.20,0,-1,-1 20241031_2029-1,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org