IOTA/IOTA-ES occultation update for (169) Zelia / UCAC4 334-209432 event on 2024 Nov 16, 10:32 UT Visible from Summary ------- On 2024 Nov 16 UT, the 36.343 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 2.68 mag to 14.07 mag (the magnitude of the asteroid) for at most 1.070 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 16, 10:28 - 2024 Nov 16, 10:35 * geocentric midpoint of event [JD]: 2460630.93892179 * magnitude of target star: 11.49 * magnitude drop [mag]: 2.68 * estimated maximum duration [s]: 1.070 * Moon: 100 % sunlit, 124° distance * Sun: 63° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 37 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.002", 76°) * approx speed of asteroid's shadow [km/s]: 33.9623 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 334-209432 by 169 Zelia on 2024 Nov 16 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 - 7 0 0 - 9 7 25 10 28 55.9 0 114 63 - 9 18 13 - 8 56 37 - 9 20 42 - 8 54 8 .... - 6 0 0 - 9 33 12 10 28 56.0 1 113 64 - 9 43 59 - 9 22 25 - 9 46 27 - 9 19 56 0.06 - 5 0 0 - 9 58 37 10 28 56.1 2 113 65 -10 9 22 - 9 47 51 -10 11 50 - 9 45 23 -0.02 - 4 0 0 -10 23 39 10 28 56.3 3 113 66 -10 34 23 -10 12 54 -10 36 51 -10 10 26 -0.04 - 3 0 0 -10 48 18 10 28 56.5 4 113 67 -10 59 1 -10 37 35 -11 1 28 -10 35 7 -0.06 - 2 0 0 -11 12 34 10 28 56.8 5 113 68 -11 23 15 -11 1 52 -11 25 42 -10 59 25 -0.07 - 1 0 0 -11 36 26 10 28 57.2 7 112 69 -11 47 6 -11 25 45 -11 49 32 -11 23 18 -0.07 0 0 0 -11 59 53 10 28 57.6 8 112 70 -12 10 32 -11 49 15 -12 12 59 -11 46 48 -0.08 1 0 0 -12 22 57 10 28 58.1 9 112 71 -12 33 34 -12 12 20 -12 36 0 -12 9 53 -0.08 2 0 0 -12 45 36 10 28 58.6 10 112 73 -12 56 11 -12 35 0 -12 58 37 -12 32 34 -0.08 3 0 0 -13 7 49 10 28 59.3 11 112 74 -13 18 24 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37.4 59 235 -3 - 7 3 32 - 6 41 39 - 7 6 3 - 6 39 8 -0.10 114 0 0 - 6 24 22 10 33 40.5 58 235 -4 - 6 35 20 - 6 13 24 - 6 37 51 - 6 10 53 -0.10 115 0 0 - 5 55 49 10 33 43.6 57 235 -5 - 6 6 48 - 5 44 50 - 6 9 19 - 5 42 19 -0.10 116 0 0 - 5 26 58 10 33 46.7 56 236 -6 - 5 37 58 - 5 15 57 - 5 40 29 - 5 13 26 -0.10 117 0 0 - 4 57 48 10 33 49.7 55 236 -7 - 5 8 49 - 4 46 47 - 5 11 21 - 4 44 15 -0.10 118 0 0 - 4 28 22 10 33 52.7 53 236 -8 - 4 39 24 - 4 17 19 - 4 41 56 - 4 14 47 -0.10 119 0 0 - 3 58 39 10 33 55.7 52 236 -9 - 4 9 42 - 3 47 35 - 4 12 14 - 3 45 2 -0.10 120 0 0 - 3 28 40 10 33 58.6 51 236 -10 - 3 39 44 - 3 17 35 - 3 42 17 - 3 15 2 -0.10 121 0 0 - 2 58 26 10 34 1.4 50 236 -12 - 3 9 31 - 2 47 20 - 3 12 4 - 2 44 47 -0.10 122 0 0 - 2 27 58 10 34 4.3 49 236 -13 - 2 39 4 - 2 16 51 - 2 41 37 - 2 14 18 -0.10 123 0 0 - 1 57 17 10 34 7.1 48 237 -14 - 2 8 24 - 1 46 9 - 2 10 57 - 1 43 36 -0.10 124 0 0 - 1 26 23 10 34 9.8 47 237 -15 - 1 37 31 - 1 15 14 - 1 40 4 - 1 12 41 -0.10 125 0 0 - 0 55 17 10 34 12.5 46 237 -16 - 1 6 26 - 0 44 8 - 1 9 0 - 0 41 34 -0.10 126 0 0 - 0 24 0 10 34 15.2 45 237 -17 - 0 35 10 - 0 12 50 - 0 37 44 - 0 10 16 -0.10 127 0 0 0 7 26 10 34 17.8 43 237 -18 - 0 3 44 0 18 37 - 0 6 18 0 21 11 -0.10 128 0 0 0 39 2 10 34 20.3 42 237 -19 0 27 51 0 50 13 0 25 17 0 52 48 -0.10 129 0 0 1 10 46 10 34 22.8 41 237 -21 0 59 34 1 21 58 0 57 0 1 24 32 -0.10 130 0 0 1 42 37 10 34 25.3 40 237 -22 1 31 25 1 53 50 1 28 50 1 56 24 -0.10 131 0 0 2 14 35 10 34 27.6 39 237 -23 2 3 22 2 25 48 2 0 47 2 28 22 -0.10 132 0 0 2 46 38 10 34 30.0 38 238 -24 2 35 24 2 57 51 2 32 50 3 0 26 -0.10 133 0 0 3 18 45 10 34 32.2 37 238 -25 3 7 32 3 29 59 3 4 57 3 32 34 -0.10 134 0 0 3 50 56 10 34 34.4 35 238 -26 3 39 42 4 2 11 3 37 8 4 4 46 -0.10 135 0 0 4 23 10 10 34 36.6 34 238 -27 4 11 56 4 34 25 4 9 21 4 37 0 -0.10 136 0 0 4 55 26 10 34 38.7 33 238 -28 4 44 11 5 6 40 4 41 36 5 9 15 -0.10 137 0 0 5 27 42 10 34 40.7 32 238 -30 5 16 27 5 38 57 5 13 52 5 41 32 -0.10 138 0 0 5 59 58 10 34 42.6 31 238 -31 5 48 43 6 11 13 5 46 8 6 13 47 -0.10 139 0 0 6 32 12 10 34 44.5 30 238 -32 6 20 57 6 43 27 6 18 23 6 46 2 -0.10 140 0 0 7 4 25 10 34 46.3 29 239 -33 6 53 10 7 15 40 6 50 35 7 18 15 -0.10 141 0 0 7 36 34 10 34 48.1 27 239 -34 7 25 20 7 47 49 7 22 45 7 50 24 -0.10 142 0 0 8 8 39 10 34 49.8 26 239 -35 7 57 25 8 19 54 7 54 50 8 22 29 -0.10 143 0 0 8 40 40 10 34 51.4 25 239 -36 8 29 26 8 51 54 8 26 51 8 54 29 -0.10 144 0 0 9 12 34 10 34 53.0 24 239 -37 9 1 21 9 23 49 8 58 46 9 26 23 -0.10 145 0 0 9 44 22 10 34 54.4 23 240 -38 9 33 9 9 55 36 9 30 34 9 58 11 -0.10 146 0 0 10 16 2 10 34 55.8 22 240 -40 10 4 49 10 27 16 10 2 15 10 29 50 -0.10 147 0 0 10 47 34 10 34 57.2 21 240 -41 10 36 21 10 58 47 10 33 47 11 1 21 -0.09 148 0 0 11 18 56 10 34 58.4 20 240 -42 11 7 44 11 30 8 11 5 10 11 32 43 -0.09 149 0 0 11 50 8 10 34 59.6 19 240 -43 11 38 57 12 1 20 11 36 22 12 3 54 -0.09 150 0 0 12 21 9 10 35 0.8 17 241 -44 12 9 58 12 32 20 12 7 24 12 34 54 -0.09 151 0 0 12 51 58 10 35 1.8 16 241 -45 12 40 48 13 3 8 12 38 14 13 5 42 -0.09 152 0 0 13 22 34 10 35 2.8 15 241 -46 13 11 25 13 33 44 13 8 51 13 36 18 -0.09 153 0 0 13 52 57 10 35 3.7 14 241 -47 13 41 49 14 4 6 13 39 15 14 6 40 -0.09 154 0 0 14 23 6 10 35 4.6 13 242 -48 14 11 58 14 34 14 14 9 25 14 36 48 -0.09 155 0 0 14 53 0 10 35 5.3 12 242 -49 14 41 53 15 4 7 14 39 20 15 6 41 -0.09 156 0 0 15 22 39 10 35 6.0 11 242 -50 15 11 33 15 33 45 15 9 0 15 36 18 -0.09 157 0 0 15 52 1 10 35 6.7 10 242 -51 15 40 56 16 3 6 15 38 23 16 5 39 -0.09 158 0 0 16 21 6 10 35 7.2 9 243 -52 16 10 2 16 32 11 16 7 30 16 34 43 -0.09 159 0 0 16 49 54 10 35 7.7 8 243 -53 16 38 51 17 0 57 16 36 19 17 3 30 -0.09 160 0 0 17 18 24 10 35 8.2 7 243 -54 17 7 22 17 29 26 17 4 50 17 31 58 -0.09 161 0 0 17 46 35 10 35 8.5 5 243 -55 17 35 34 17 57 36 17 33 2 18 0 8 -0.08 162 0 0 18 14 27 10 35 8.8 4 244 -56 18 3 27 18 25 27 18 0 56 18 27 58 -0.08 163 0 0 18 41 59 10 35 9.1 3 244 -57 18 31 0 18 52 58 18 28 29 18 55 29 -0.07 164 0 0 19 9 11 10 35 9.2 2 244 -58 18 58 14 19 20 8 18 55 43 19 22 39 -0.06 165 0 0 19 36 2 10 35 9.3 1 245 -59 19 25 6 19 46 58 19 22 35 19 49 29 -0.03 166 0 0 20 2 32 10 35 9.4 0 245 -60 19 51 37 20 13 27 19 49 7 20 15 58 0.28 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 334-209432 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 58 36.9805 DE: -23 18 54.394 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 58 36.9801 DE: -23 18 54.395 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * 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 ["]: 0.022 distance from Earth [AU]: 2.30590 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): 0.020", 0.002", 75.802° remarks: * orbital elements for (169)Zelia : Mean anomaly = 354.5097089738 deg Arg. of pericenter = 334.8197907781 deg Long. of node = 354.7183191046 deg Inclination = 5.5001643598 deg Eccentricity = 0.1301839722 Semimajor axis = 2.3582193975 AU Perihelion dist = 2.0512170290 AU Mag: H = 9.53, G = 0.15 Epoch of elements : MJD 60630.43892151 TDT (2024 Nov 16.4389) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,1.07,2024,11,16,10.534123,-0.027930,0.101208,18.440671,5.234722,0.004765,0.000850,-0.000001,0.000000 86.0179,-23.2492,18.20,-18.91,False UCAC4 334-209432,19.97693907,-23.3151093,11.79,11.49,11.33,0.0,0,,20.00142710,-23.2492404,1.39,1.70,1,0,1 169,Zelia,14.07,36.343,2.3059,0,0,5.103,19.97,,2.2,0 0,354.3903,2024,11,16,334.8198,354.7183,5.5002,0.13018,2.35822,2.05122,9.53,5.0,0.15 1.115,0.0197,0.0024,76,0.0025,Known errors,1.19,0,-1,-1 20241116_209432,60140.70 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org