IOTA/IOTA-ES occultation update for (435) Ella / TYC 6862-01217-1 event on 2024 Oct 29, 00:08 UT Visible from Summary ------- On 2024 Oct 29 UT, the 38.417896088233 km diameter asteroid (435) Ella will occult a 11.3 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 3.92 mag to 15.16 mag (the magnitude of the asteroid) for at most 1.210 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 29, 00:05 - 2024 Oct 29, 00:11 * geocentric midpoint of event [JD]: 2460612.50579050 * magnitude of target star: 11.27 * magnitude drop [mag]: 3.92 * estimated maximum duration [s]: 1.210 * Moon: 10 % sunlit, 101° distance * Sun: 64° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 44 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 88°) * approx speed of asteroid's shadow [km/s]: 32.0012 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6862-01217-1 by 435 Ella on 2024 Oct 29 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 136 0 0 .. .. .... .. .. .. .. .. .. -30 19 21 .. .. .. -30 22 24 .. .. .. .... 137 0 0 -30 34 28 0 5 24.6 1 118 51 -30 48 3 -30 20 55 -30 51 7 -30 17 53 .... 138 0 0 -31 3 4 0 5 24.7 2 118 52 -31 16 39 -30 49 31 -31 19 43 -30 46 28 0.50 139 0 0 -31 31 32 0 5 24.9 3 117 53 -31 45 7 -31 17 59 -31 48 11 -31 14 56 0.51 140 0 0 -31 59 52 0 5 25.1 4 117 53 -32 13 27 -31 46 19 -32 16 31 -31 43 16 0.52 141 0 0 -32 28 3 0 5 25.4 5 116 54 -32 41 38 -32 14 29 -32 44 41 -32 11 27 0.52 142 0 0 -32 56 3 0 5 25.7 6 116 55 -33 9 38 -32 42 31 -33 12 42 -32 39 28 0.53 143 0 0 -33 23 54 0 5 26.1 7 115 55 -33 37 28 -33 10 21 -33 40 32 -33 7 19 0.53 144 0 0 -33 51 33 0 5 26.6 8 115 56 -34 5 7 -33 38 0 -34 8 10 -33 34 58 0.53 145 0 0 -34 19 0 0 5 27.2 9 114 56 -34 32 33 -34 5 28 -34 35 37 -34 2 26 0.53 146 0 0 -34 46 14 0 5 27.7 10 113 57 -34 59 47 -34 32 43 -35 2 50 -34 29 41 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0.56 - 40 0 0 -30 12 9 0 11 2.1 20 253 -36 -30 25 45 -29 58 36 -30 28 49 -29 55 33 0.56 - 39 0 0 -29 43 12 0 11 3.5 19 252 -37 -29 56 48 -29 29 39 -29 59 52 -29 26 36 0.56 - 38 0 0 -29 14 10 0 11 4.7 18 251 -38 -29 27 45 -29 0 37 -29 30 49 -28 57 34 0.56 - 37 0 0 -28 45 3 0 11 5.9 17 251 -39 -28 58 38 -28 31 30 -29 1 41 -28 28 27 0.56 - 36 0 0 -28 15 52 0 11 7.1 16 250 -40 -28 29 26 -28 2 19 -28 32 30 -27 59 17 0.57 - 35 0 0 -27 46 38 0 11 8.2 15 250 -41 -28 0 12 -27 33 6 -28 3 15 -27 30 4 0.57 - 34 0 0 -27 17 22 0 11 9.2 14 249 -42 -27 30 55 -27 3 51 -27 33 58 -27 0 48 0.57 - 33 0 0 -26 48 5 0 11 10.2 13 249 -42 -27 1 37 -26 34 34 -27 4 40 -26 31 32 0.57 - 32 0 0 -26 18 47 0 11 11.1 12 248 -43 -26 32 19 -26 5 17 -26 35 22 -26 2 15 0.58 - 31 0 0 -25 49 30 0 11 11.9 11 248 -44 -26 3 1 -25 36 1 -26 6 4 -25 32 59 0.58 - 30 0 0 -25 20 14 0 11 12.7 10 247 -45 -25 33 45 -25 6 46 -25 36 47 -25 3 45 0.58 - 29 0 0 -24 51 1 0 11 13.3 9 247 -46 -25 4 30 -24 37 34 -25 7 33 -24 34 33 0.59 - 28 0 0 -24 21 51 0 11 14.0 8 247 -47 -24 35 19 -24 8 25 -24 38 21 -24 5 24 0.59 - 27 0 0 -23 52 45 0 11 14.5 7 246 -48 -24 6 12 -23 39 19 -24 9 13 -23 36 19 0.60 - 26 0 0 -23 23 43 0 11 15.0 6 246 -49 -23 37 9 -23 10 19 -23 40 11 -23 7 19 0.61 - 25 0 0 -22 54 48 0 11 15.4 5 245 -50 -23 8 12 -22 41 25 -23 11 14 -22 38 24 0.63 - 24 0 0 -22 25 59 0 11 15.7 4 245 -50 -22 39 22 -22 12 37 -22 42 23 -22 9 37 0.65 - 23 0 0 -21 57 17 0 11 16.0 3 245 -51 -22 10 39 -21 43 57 -22 13 40 -21 40 57 0.69 - 22 0 0 -21 28 44 0 11 16.2 2 244 -52 -21 42 4 -21 15 25 -21 45 5 -21 12 25 0.77 - 21 0 0 -21 0 19 0 11 16.3 1 244 -53 -21 13 39 -20 47 2 -21 16 39 -20 44 3 1.04 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 6862-01217-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 41 02.1482 DE: -24 42 32.881 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 41 02.1482 DE: -24 42 32.881 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.3 * B mag [mag]: 12.0 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (435) Ella asteroid class: approx. diameter [km]: 38 approx. diameter ["]: 0.022 distance from Earth [AU]: 2.44190 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#95 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): 0.014", 0.002", 87.819° remarks: * orbital elements for (435)Ella : Mean anomaly = 319.9337981016 deg Arg. of pericenter = 333.4840838388 deg Long. of node = 23.1321190617 deg Inclination = 1.8157988576 deg Eccentricity = 0.1546009610 Semimajor axis = 2.4499768839 AU Perihelion dist = 2.0712081032 AU Mag: H = 10.40, G = 0.15 Epoch of elements : MJD 60612.00579050 TDT (2024 Oct 29.0058) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#952023Apr24,1.21,2024,10,29,0.138972,0.043335,-0.467102,17.983579,1.685288,0.004979,0.000297,-0.000001,0.000000 -119.2717,-24.6870,173.84,-13.54,False TYC 6862-01217-1,18.68393011,-24.7091336,11.95,11.27,10.90,0.1,0,,18.70906931,-24.6870139,3.92,3.84,0,0,0 435,Ella,15.16,38.595,2.4419,0,0,4.752,6.07,,2.0,0 0,319.6753,2024,10,28,333.4841,23.1321,1.8158,0.15460,2.44998,2.07121,10.40,5.0,0.15 1.112,0.0140,0.0023,88,0.0024,Known errors,0.92,0,-1,-1 20241029_1217-1,60140.67 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:58 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org