IOTA/IOTA-ES occultation update for (1234) Elyna / UCAC4 333-193205 event on 2024 Oct 17, 19:12 UT Visible from Summary ------- On 2024 Oct 17 UT, the 26.081 km diameter asteroid (1234) Elyna will occult a 11.8 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 4.83 mag to 16.63 mag (the magnitude of the asteroid) for at most 1.130 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 17, 19:09 - 2024 Oct 17, 19:16 * geocentric midpoint of event [JD]: 2460601.30062245 * magnitude of target star: 11.81 * magnitude drop [mag]: 4.83 * estimated maximum duration [s]: 1.130 * Moon: 100 % sunlit, 109° distance * Sun: 77° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 34 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.013", 0.002", 76°) * approx speed of asteroid's shadow [km/s]: 23.0343 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 333-193205 by 1234 Elyna on 2024 Oct 17 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 -148 0 0 -47 6 43 19 9 23.1 1 125 41 -47 18 11 -46 55 17 -47 23 2 -46 50 29 .... -147 0 0 -47 35 54 19 9 23.2 2 124 41 -47 47 22 -47 24 28 -47 52 13 -47 19 40 0.77 -146 0 0 -48 4 48 19 9 23.4 2 123 42 -48 16 15 -47 53 22 -48 21 6 -47 48 34 0.81 -145 0 0 -48 33 23 19 9 23.7 3 123 42 -48 44 50 -48 21 58 -48 49 41 -48 17 10 0.82 -144 0 0 -49 1 40 19 9 24.0 4 122 42 -49 13 6 -48 50 15 -49 17 56 -48 45 28 0.83 -143 0 0 -49 29 37 19 9 24.4 5 121 42 -49 41 3 -49 18 13 -49 45 52 -49 13 26 0.84 -142 0 0 -49 57 13 19 9 24.9 6 120 42 -50 8 39 -49 45 50 -50 13 28 -49 41 3 0.84 -141 0 0 -50 24 29 19 9 25.4 6 120 42 -50 35 53 -50 13 7 -50 40 43 -50 8 20 0.84 -140 0 0 -50 51 24 19 9 26.0 7 119 42 -51 2 47 -50 40 2 -51 7 36 -50 35 16 0.85 -139 0 0 -51 17 56 19 9 26.6 8 118 43 -51 29 18 -51 6 36 -51 34 7 -51 1 50 0.85 -138 0 0 -51 44 6 19 9 27.3 9 117 43 -51 55 27 -51 32 47 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36 -31 34 49 -32 1 12 -31 30 15 0.91 58 0 0 -31 14 59 19 16 17.8 11 249 -48 -31 25 51 -31 4 9 -31 30 26 -30 59 36 0.92 59 0 0 -30 44 32 19 16 19.0 10 248 -49 -30 55 21 -30 33 44 -30 59 56 -30 29 12 0.92 60 0 0 -30 14 21 19 16 20.1 9 248 -50 -30 25 8 -30 3 35 -30 29 41 -29 59 4 0.93 61 0 0 -29 44 26 19 16 21.0 8 247 -50 -29 55 11 -29 33 43 -29 59 44 -29 29 13 0.94 62 0 0 -29 14 50 19 16 21.9 7 247 -51 -29 25 32 -29 4 9 -29 30 4 -28 59 40 0.95 63 0 0 -28 45 32 19 16 22.6 6 246 -51 -28 56 12 -28 34 54 -29 0 43 -28 30 26 0.97 64 0 0 -28 16 34 19 16 23.2 5 246 -52 -28 27 12 -28 5 58 -28 31 42 -28 1 31 0.99 65 0 0 -27 47 57 19 16 23.7 4 245 -53 -27 58 32 -27 37 23 -28 3 1 -27 32 57 1.02 66 0 0 -27 19 41 19 16 24.1 3 245 -53 -27 30 14 -27 9 9 -27 34 41 -27 4 44 1.07 67 0 0 -26 51 47 19 16 24.4 2 245 -54 -27 2 17 -26 41 18 -27 6 44 -26 36 53 1.18 68 0 0 -26 24 15 19 16 24.6 1 244 -54 -26 34 43 -26 13 49 -26 39 9 -26 9 25 1.50 69 0 0 .. .. .... .. .. .. .. .. .. -26 7 33 .. .. .. -26 11 58 .. .. .. .... Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 333-193205 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 49 19.5493 DE: -23 34 47.332 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 49 19.5491 DE: -23 34 47.333 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.8 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1234) Elyna asteroid class: approx. diameter [km]: 26 approx. diameter ["]: 0.012 distance from Earth [AU]: 3.08280 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#56 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): 0.013", 0.002", 75.572° remarks: * orbital elements for (1234)Elyna : Mean anomaly = 274.9189035115 deg Arg. of pericenter = 90.7684440127 deg Long. of node = 304.3131293030 deg Inclination = 8.5284238879 deg Eccentricity = 0.0871101649 Semimajor axis = 3.0138647221 AU Perihelion dist = 2.7513264693 AU Mag: H = 10.84, G = 0.15 Epoch of elements : MJD 60600.80062221 TDT (2024 Oct 17.8006) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#562023Apr24,1.13,2024,10,17,19.214939,0.134531,-0.632493,12.718580,2.696154,0.005636,0.000479,0.000000,0.000000 -32.2971,-23.5527,-111.92,-9.64,False UCAC4 333-193205,18.82209705,-23.5798145,12.40,11.81,11.49,0.0,0,,18.84704986,-23.5527223,4.83,4.70,0,0,0 1234,Elyna,16.63,26.081,3.0828,0,0,2.639,7.70,,1.6,0 0,274.7681,2024,10,17,90.7684,304.3131,8.5284,0.08711,3.01386,2.75133,10.83,5.0,0.15 1.211,0.0133,0.0024,76,0.0025,Known errors,1.03,0,-1,-1 20241017_193205,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org