IOTA/IOTA-ES occultation update for (169) Zelia / HIP 89984 event on 2024 Jun 15, 22:58 UT Visible from Summary ------- On 2024 Jun 15 UT, the 36.2979758476106 km diameter asteroid (169) Zelia will occult a 7.1 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 5.01 mag to 12.06 mag (the magnitude of the asteroid) for at most 4.630 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 Jun 15, 22:45 - 2024 Jun 15, 23:12 * geocentric midpoint of event [JD]: 2460477.45758963 * magnitude of target star: 7.06 * magnitude drop [mag]: 5.01 * estimated maximum duration [s]: 4.630 * Moon: 66 % sunlit, 81° distance * Sun: 166° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 37 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.039, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.039", 0.002", 88°) * approx speed of asteroid's shadow [km/s]: 7.9396 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 89984 by 169 Zelia on 2024 Jun 15 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 - 74 0 0 -12 22 41 23 12 12.0 1 124 -8 -12 10 35 -12 34 48 -12 8 37 -12 36 45 .... - 73 0 0 -13 2 43 23 12 11.5 2 124 -9 -12 50 38 -13 14 49 -12 48 40 -13 16 47 0.15 - 72 0 0 -13 42 30 23 12 10.7 3 124 -11 -13 30 25 -13 54 35 -13 28 28 -13 56 32 0.13 - 71 0 0 -14 21 59 23 12 9.5 5 123 -12 -14 9 55 -14 34 3 -14 7 58 -14 36 0 0.13 - 70 0 0 -15 1 9 23 12 8.0 6 123 -13 -14 49 7 -15 13 12 -14 47 10 -15 15 9 0.12 - 69 0 0 -15 40 1 23 12 6.2 7 123 -14 -15 27 59 -15 52 2 -15 26 3 -15 53 59 0.12 - 68 0 0 -16 18 31 23 12 4.1 8 123 -15 -16 6 31 -16 30 31 -16 4 35 -16 32 28 0.11 - 67 0 0 -16 56 40 23 12 1.7 9 122 -16 -16 44 42 -17 8 39 -16 42 46 -17 10 35 0.11 - 66 0 0 -17 34 27 23 11 59.0 10 122 -17 -17 22 30 -17 46 24 -17 20 34 -17 48 20 0.11 - 65 0 0 -18 11 50 23 11 56.0 11 122 -18 -17 59 55 -18 23 46 -17 57 59 -18 25 42 0.11 - 64 0 0 -18 48 49 23 11 52.7 13 121 -20 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45 39.4 1 236 9 - 1 16 32 - 1 40 35 - 1 14 35 - 1 42 32 0.27 120 0 0 .. .. .... .. .. .. .. .. .. - 0 36 27 - 1 0 28 - 0 34 30 - 1 2 25 .... Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: HIP 89984 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 21 34.4140 DE: -33 31 49.162 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 21 34.4140 DE: -33 31 49.163 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 7.1 * B mag [mag]: 7.9 * Diameter [mas]: 0.50 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (169) Zelia asteroid class: approx. diameter [km]: 36 approx. diameter ["]: 0.043 distance from Earth [AU]: 1.17480 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): 0.039", 0.002", 87.8° remarks: * orbital elements for (169)Zelia : Mean anomaly = 312.7621713186 deg Arg. of pericenter = 334.7967915985 deg Long. of node = 354.7218506572 deg Inclination = 5.4999758878 deg Eccentricity = 0.1302797205 Semimajor axis = 2.3584933382 AU Perihelion dist = 2.0512294853 AU Mag: H = 9.53, G = 0.15 Epoch of elements : MJD 60476.95758995 TDT (2024 Jun 15.9576) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,4.63,2024,6,15,22.982151,0.014999,-0.129207,-4.451405,-0.517276,-0.000880,0.000878,0.000001,0.000000 26.3567,-33.5190,-164.55,23.36,False HIP 89984,18.35955945,-33.5303228,7.91,7.06,6.60,0.5,0,,18.38680083,-33.5190330,5.01,5.02,0,0,0 169,Zelia,12.06,36.724,1.1748,0,0,-2.665,-3.87,,2.2,0 0,312.5016,2024,6,15,334.7968,354.7219,5.5000,0.13028,2.35849,2.05123,9.53,5.0,0.15 1.081,0.0393,0.0017,88,0.0035,Known errors,1.04,0,-1,-1 20240615__89984,60139.39 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 09:16 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org