IOTA/IOTA-ES occultation update for (435) Ella / TYC 6874-01196-1 event on 2024 Nov 13, 20:10 UT Visible from Summary ------- On 2024 Nov 13 UT, the 38.5268365802424 km diameter asteroid (435) Ella will occult a 9.6 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 5.58 mag to 15.20 mag (the magnitude of the asteroid) for at most 1.060 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 13, 20:07 - 2024 Nov 13, 20:13 * geocentric midpoint of event [JD]: 2460628.34035375 * magnitude of target star: 9.63 * magnitude drop [mag]: 5.58 * estimated maximum duration [s]: 1.060 * Moon: 94 % sunlit, 97° distance * Sun: 55° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 39 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 84°) * approx speed of asteroid's shadow [km/s]: 36.5223 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6874-01196-1 by 435 Ella on 2024 Nov 13 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 -157 0 0 .. .. .... .. .. .. .. .. .. - 0 42 42 .. .. .. - 0 45 3 .. .. .. .... -156 0 0 - 0 57 43 20 7 13.6 1 114 56 - 1 9 16 - 0 46 9 - 1 11 38 - 0 43 47 .... -155 0 0 - 1 24 6 20 7 13.7 2 114 57 - 1 35 39 - 1 12 33 - 1 38 1 - 1 10 11 -0.03 -154 0 0 - 1 50 17 20 7 13.8 3 114 58 - 2 1 49 - 1 38 45 - 2 4 10 - 1 36 23 -0.07 -153 0 0 - 2 16 14 20 7 14.1 4 114 59 - 2 27 45 - 2 4 43 - 2 30 6 - 2 2 21 -0.08 -152 0 0 - 2 41 58 20 7 14.3 5 114 60 - 2 53 28 - 2 30 27 - 2 55 49 - 2 28 6 -0.09 -151 0 0 - 3 7 27 20 7 14.7 7 114 61 - 3 18 56 - 2 55 57 - 3 21 17 - 2 53 36 -0.10 -150 0 0 - 3 32 40 20 7 15.1 8 114 62 - 3 44 9 - 3 21 12 - 3 46 29 - 3 18 51 -0.10 -149 0 0 - 3 57 39 20 7 15.6 9 114 63 - 4 9 6 - 3 46 11 - 4 11 26 - 3 43 51 -0.11 -148 0 0 - 4 22 21 20 7 16.1 10 113 64 - 4 33 47 - 4 10 54 - 4 36 7 - 4 8 34 -0.11 -147 0 0 - 4 46 46 20 7 16.7 11 113 65 - 4 58 11 - 4 35 20 - 5 0 31 - 4 33 0 -0.11 -146 0 0 - 5 10 54 20 7 17.4 12 113 66 - 5 22 18 - 4 59 30 - 5 24 37 - 4 57 10 -0.11 -145 0 0 - 5 34 44 20 7 18.1 13 113 67 - 5 46 7 - 5 23 21 - 5 48 26 - 5 21 1 -0.11 -144 0 0 - 5 58 16 20 7 18.9 14 113 68 - 6 9 38 - 5 46 54 - 6 11 57 - 5 44 35 -0.12 -143 0 0 - 6 21 30 20 7 19.7 15 113 69 - 6 32 50 - 6 10 9 - 6 35 9 - 6 7 50 -0.12 -142 0 0 - 6 44 24 20 7 20.6 16 113 70 - 6 55 43 - 6 33 4 - 6 58 2 - 6 30 45 -0.12 -141 0 0 - 7 6 59 20 7 21.5 17 113 71 - 7 18 17 - 6 55 40 - 7 20 36 - 6 53 22 -0.12 -140 0 0 - 7 29 14 20 7 22.5 18 113 72 - 7 40 31 - 7 17 57 - 7 42 49 - 7 15 38 -0.12 -139 0 0 - 7 51 9 20 7 23.6 19 113 73 - 8 2 24 - 7 39 53 - 8 4 43 - 7 37 34 -0.12 -138 0 0 - 8 12 43 20 7 24.7 20 112 74 - 8 23 57 - 8 1 28 - 8 26 15 - 7 59 10 -0.12 -137 0 0 - 8 33 56 20 7 25.9 22 112 75 - 8 45 9 - 8 22 42 - 8 47 27 - 8 20 24 -0.12 -136 0 0 - 8 54 47 20 7 27.1 23 112 76 - 9 5 59 - 8 43 35 - 9 8 17 - 8 41 17 -0.12 -135 0 0 - 9 15 17 20 7 28.3 24 112 77 - 9 26 28 - 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15 0 0 0 26 48 20 12 31.1 33 241 -21 0 15 11 0 38 26 0 12 48 0 40 48 -0.13 - 14 0 0 0 54 11 20 12 32.9 32 241 -22 0 42 33 1 5 50 0 40 11 1 8 12 -0.13 - 13 0 0 1 21 44 20 12 34.7 31 241 -23 1 10 5 1 33 23 1 7 43 1 35 46 -0.13 - 12 0 0 1 49 26 20 12 36.4 30 241 -24 1 37 46 2 1 5 1 35 24 2 3 28 -0.13 - 11 0 0 2 17 16 20 12 38.1 29 241 -25 2 5 36 2 28 56 2 3 13 2 31 19 -0.13 - 10 0 0 2 45 13 20 12 39.7 28 241 -27 2 33 32 2 56 54 2 31 9 2 59 17 -0.13 - 9 0 0 3 13 17 20 12 41.2 26 241 -28 3 1 36 3 24 58 2 59 13 3 27 22 -0.13 - 8 0 0 3 41 27 20 12 42.7 25 241 -29 3 29 45 3 53 9 3 27 22 3 55 32 -0.13 - 7 0 0 4 9 42 20 12 44.2 24 242 -30 3 58 0 4 21 24 3 55 37 4 23 48 -0.13 - 6 0 0 4 38 1 20 12 45.5 23 242 -31 4 26 19 4 49 44 4 23 56 4 52 8 -0.13 - 5 0 0 5 6 25 20 12 46.8 22 242 -32 4 54 42 5 18 8 4 52 19 5 20 31 -0.13 - 4 0 0 5 34 51 20 12 48.1 21 242 -33 5 23 8 5 46 34 5 20 44 5 48 58 -0.13 - 3 0 0 6 3 19 20 12 49.3 20 242 -34 5 51 36 6 15 3 5 49 12 6 17 26 -0.13 - 2 0 0 6 31 49 20 12 50.4 19 242 -35 6 20 6 6 43 32 6 17 42 6 45 56 -0.12 - 1 0 0 7 0 19 20 12 51.4 18 242 -36 6 48 36 7 12 3 6 46 12 7 14 27 -0.12 0 0 0 7 28 49 20 12 52.4 17 242 -38 7 17 6 7 40 33 7 14 42 7 42 57 -0.12 1 0 0 7 57 18 20 12 53.4 15 243 -39 7 45 35 8 9 2 7 43 11 8 11 26 -0.12 2 0 0 8 25 46 20 12 54.2 14 243 -40 8 14 2 8 37 30 8 11 39 8 39 54 -0.12 3 0 0 8 54 11 20 12 55.0 13 243 -41 8 42 27 9 5 55 8 40 4 9 8 18 -0.12 4 0 0 9 22 33 20 12 55.8 12 243 -42 9 10 49 9 34 16 9 8 26 9 36 40 -0.12 5 0 0 9 50 50 20 12 56.4 11 243 -43 9 39 7 10 2 34 9 36 44 10 4 58 -0.12 6 0 0 10 19 4 20 12 57.0 10 243 -44 10 7 21 10 30 47 10 4 57 10 33 11 -0.12 7 0 0 10 47 11 20 12 57.6 9 244 -45 10 35 29 10 58 54 10 33 5 11 1 18 -0.12 8 0 0 11 15 13 20 12 58.1 8 244 -46 11 3 31 11 26 56 11 1 7 11 29 19 -0.12 9 0 0 11 43 8 20 12 58.5 7 244 -47 11 31 26 11 54 50 11 29 2 11 57 14 -0.12 10 0 0 12 10 55 20 12 58.8 6 244 -48 11 59 13 12 22 37 11 56 50 12 25 0 -0.11 11 0 0 12 38 34 20 12 59.1 5 244 -49 12 26 53 12 50 15 12 24 29 12 52 39 -0.11 12 0 0 13 6 4 20 12 59.4 3 245 -50 12 54 23 13 17 45 12 52 0 13 20 8 -0.11 13 0 0 13 33 24 20 12 59.5 2 245 -51 13 21 44 13 45 5 13 19 21 13 47 28 -0.10 14 0 0 14 0 34 20 12 59.6 1 245 -52 13 48 55 14 12 14 13 46 32 14 14 37 -0.07 15 0 0 14 27 34 20 12 59.7 0 245 -54 14 15 55 14 39 13 14 13 32 14 41 36 0.23 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 6874-01196-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 12 13.5268 DE: -23 53 01.048 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 12 13.5267 DE: -23 53 01.048 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.6 * B mag [mag]: 10.3 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (435) Ella asteroid class: approx. diameter [km]: 39 approx. diameter ["]: 0.021 distance from Earth [AU]: 2.58060 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", 83.55° remarks: * orbital elements for (435)Ella : Mean anomaly = 323.9992387206 deg Arg. of pericenter = 333.4891263257 deg Long. of node = 23.1315203667 deg Inclination = 1.8158031532 deg Eccentricity = 0.1545904502 Semimajor axis = 2.4499331562 AU Perihelion dist = 2.0711968866 AU Mag: H = 10.40, G = 0.15 Epoch of elements : MJD 60627.84035359 TDT (2024 Nov 13.8404) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#952023Apr24,1.06,2024,11,13,20.168490,-0.019294,0.131624,20.403747,2.938168,0.004492,0.000485,-0.000001,0.000000 -67.5288,-23.8433,-126.43,-18.25,False TYC 6874-01196-1,19.20375749,-23.8836244,10.31,9.63,9.26,0.1,0,,19.22860170,-23.8433023,5.58,5.49,0,0,0 435,Ella,15.20,38.714,2.5806,0,0,5.068,10.02,,2.0,0 0,323.7832,2024,11,13,333.4891,23.1315,1.8158,0.15459,2.44993,2.07120,10.40,5.0,0.15 1.102,0.0140,0.0021,84,0.0021,Known errors,1.14,0,-1,-1 20241113_1196-1,60140.70 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 16:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org