IOTA/IOTA-ES occultation update for (435) Ella / TYC 6846-00307-1 event on 2024 Oct 10, 16:44 UT Visible from Summary ------- On 2024 Oct 10 UT, the 38.555 km diameter asteroid (435) Ella will occult a 11.0 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 4.09 mag to 15.08 mag (the magnitude of the asteroid) for at most 1.470 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 10, 16:39 - 2024 Oct 10, 16:48 * geocentric midpoint of event [JD]: 2460594.19726508 * magnitude of target star: 11.02 * magnitude drop [mag]: 4.09 * estimated maximum duration [s]: 1.470 * Moon: 49 % sunlit, 15° distance * Sun: 74° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 39 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.003", 93°) * approx speed of asteroid's shadow [km/s]: 26.1942 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6846-00307-1 by 435 Ella on 2024 Oct 10 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 - 84 0 0 6 15 59 16 40 3.6 0 115 73 6 4 16 6 27 43 6 1 17 6 30 42 .... - 83 0 0 5 47 35 16 40 3.7 2 116 74 5 35 53 5 59 18 5 32 54 6 2 17 0.00 - 82 0 0 5 19 15 16 40 3.9 3 116 75 5 7 33 5 30 58 5 4 35 5 33 57 -0.07 - 81 0 0 4 51 1 16 40 4.1 4 116 76 4 39 19 5 2 43 4 36 21 5 5 42 -0.10 - 80 0 0 4 22 52 16 40 4.5 5 116 77 4 11 11 4 34 34 4 8 13 4 37 32 -0.11 - 79 0 0 3 54 50 16 40 4.9 6 116 78 3 43 10 4 6 31 3 40 11 4 9 29 -0.12 - 78 0 0 3 26 55 16 40 5.5 7 116 79 3 15 15 3 38 36 3 12 17 3 41 34 -0.13 - 77 0 0 2 59 9 16 40 6.1 8 116 79 2 47 29 3 10 48 2 44 31 3 13 46 -0.13 - 76 0 0 2 31 31 16 40 6.8 9 116 80 2 19 52 2 43 10 2 16 55 2 46 8 -0.13 - 75 0 0 2 4 2 16 40 7.6 10 116 81 1 52 25 2 15 41 1 49 27 2 18 38 -0.14 - 74 0 0 1 36 44 16 40 8.5 11 116 81 1 25 7 1 48 22 1 22 10 1 51 19 -0.14 - 73 0 0 1 9 37 16 40 9.5 13 116 82 0 58 1 1 21 14 0 55 4 1 24 11 -0.14 - 72 0 0 0 42 42 16 40 10.6 14 116 82 0 31 6 0 54 17 0 28 9 0 57 14 -0.14 - 71 0 0 0 15 58 16 40 11.7 15 116 82 0 4 24 0 27 33 0 1 27 0 30 30 -0.14 - 70 0 0 - 0 10 32 16 40 13.0 16 116 82 - 0 22 5 0 1 2 - 0 25 2 0 3 58 -0.15 - 69 0 0 - 0 36 49 16 40 14.3 17 116 82 - 0 48 21 - 0 25 16 - 0 51 17 - 0 22 20 -0.15 - 68 0 0 - 1 2 51 16 40 15.7 18 116 82 - 1 14 23 - 0 51 20 - 1 17 19 - 0 48 23 -0.15 - 67 0 0 - 1 28 39 16 40 17.2 19 116 82 - 1 40 10 - 1 17 8 - 1 43 5 - 1 14 12 -0.15 - 66 0 0 - 1 54 12 16 40 18.8 20 116 81 - 2 5 41 - 1 42 42 - 2 8 36 - 1 39 46 -0.15 - 65 0 0 - 2 19 28 16 40 20.4 21 116 80 - 2 30 56 - 2 7 59 - 2 33 51 - 2 5 4 -0.15 - 64 0 0 - 2 44 28 16 40 22.2 22 116 80 - 2 55 55 - 2 33 0 - 2 58 50 - 2 30 5 -0.15 - 63 0 0 - 3 9 11 16 40 24.0 23 116 79 - 3 20 37 - 2 57 44 - 3 23 31 - 2 54 49 -0.15 - 62 0 0 - 3 33 36 16 40 25.9 25 116 78 - 3 45 1 - 3 22 10 - 3 47 55 - 3 19 16 -0.15 - 61 0 0 - 3 57 43 16 40 27.9 26 116 77 - 4 9 7 - 3 46 19 - 4 12 1 - 3 43 24 -0.15 - 60 0 0 - 4 21 31 16 40 29.9 27 116 76 - 4 32 54 - 4 10 8 - 4 35 48 - 4 7 14 -0.15 - 59 0 0 - 4 45 0 16 40 32.1 28 116 75 - 4 56 22 - 4 33 38 - 4 59 15 - 4 30 45 -0.15 - 58 0 0 - 5 8 10 16 40 34.3 29 116 75 - 5 19 30 - 4 56 49 - 5 22 23 - 4 53 56 -0.15 - 57 0 0 - 5 31 0 16 40 36.5 30 116 74 - 5 42 19 - 5 19 40 - 5 45 12 - 5 16 47 -0.16 - 56 0 0 - 5 53 29 16 40 38.9 31 116 73 - 6 4 47 - 5 42 11 - 6 7 39 - 5 39 18 -0.16 - 55 0 0 - 6 15 37 16 40 41.3 32 116 72 - 6 26 54 - 6 4 20 - 6 29 46 - 6 1 28 -0.16 - 54 0 0 - 6 37 24 16 40 43.7 33 116 71 - 6 48 40 - 6 26 8 - 6 51 32 - 6 23 16 -0.16 - 53 0 0 - 6 58 50 16 40 46.3 34 116 70 - 7 10 4 - 6 47 35 - 7 12 55 - 6 44 43 -0.16 - 52 0 0 - 7 19 53 16 40 48.9 35 116 69 - 7 31 6 - 7 8 40 - 7 33 57 - 7 5 48 -0.16 - 51 0 0 - 7 40 34 16 40 51.5 36 116 68 - 7 51 46 - 7 29 22 - 7 54 37 - 7 26 31 -0.16 - 50 0 0 - 8 0 53 16 40 54.3 37 116 67 - 8 12 3 - 7 49 42 - 8 14 54 - 7 46 51 -0.16 - 49 0 0 - 8 20 48 16 40 57.1 38 116 66 - 8 31 57 - 8 9 38 - 8 34 48 - 8 6 48 -0.16 - 48 0 0 - 8 40 20 16 40 59.9 39 116 65 - 8 51 28 - 8 29 12 - 8 54 18 - 8 26 22 -0.16 - 47 0 0 - 8 59 29 16 41 2.8 40 116 64 - 9 10 36 - 8 48 22 - 9 13 25 - 8 45 32 -0.16 - 46 0 0 - 9 18 14 16 41 5.8 41 116 63 - 9 29 19 - 9 7 8 - 9 32 8 - 9 4 18 -0.16 - 45 0 0 - 9 36 34 16 41 8.8 42 116 62 - 9 47 39 - 9 25 30 - 9 50 28 - 9 22 40 -0.16 - 44 0 0 - 9 54 31 16 41 11.8 44 116 61 -10 5 34 - 9 43 27 -10 8 23 - 9 40 38 -0.16 - 43 0 0 -10 12 3 16 41 14.9 45 116 60 -10 23 4 -10 1 0 -10 25 53 - 9 58 12 -0.16 - 42 0 0 -10 29 10 16 41 18.1 46 116 59 -10 40 10 -10 18 9 -10 42 59 -10 15 20 -0.16 - 41 0 0 -10 45 52 16 41 21.3 47 116 58 -10 56 51 -10 34 52 -10 59 39 -10 32 4 -0.16 - 40 0 0 -11 2 9 16 41 24.6 48 116 57 -11 13 7 -10 51 10 -11 15 55 -10 48 22 -0.16 - 39 0 0 -11 18 0 16 41 27.9 49 116 56 -11 28 58 -11 7 3 -11 31 45 -11 4 15 -0.16 - 38 0 0 -11 33 27 16 41 31.2 50 116 55 -11 44 23 -11 22 30 -11 47 10 -11 19 43 -0.16 - 37 0 0 -11 48 27 16 41 34.6 51 116 54 -11 59 22 -11 37 32 -12 2 9 -11 34 45 -0.16 - 36 0 0 -12 3 2 16 41 38.0 52 116 53 -12 13 56 -11 52 8 -12 16 42 -11 49 21 -0.16 - 35 0 0 -12 17 11 16 41 41.5 53 116 52 -12 28 4 -12 6 18 -12 30 50 -12 3 31 -0.16 - 34 0 0 -12 30 54 16 41 45.0 54 116 50 -12 41 46 -12 20 2 -12 44 32 -12 17 15 -0.16 - 33 0 0 -12 44 10 16 41 48.5 55 116 49 -12 55 1 -12 33 19 -12 57 47 -12 30 33 -0.16 - 32 0 0 -12 57 1 16 41 52.1 56 116 48 -13 7 51 -12 46 11 -13 10 36 -12 43 25 -0.16 - 31 0 0 -13 9 25 16 41 55.7 57 116 47 -13 20 14 -12 58 36 -13 22 59 -12 55 50 -0.16 - 30 0 0 -13 21 23 16 41 59.4 58 116 46 -13 32 11 -13 10 34 -13 34 56 -13 7 49 -0.16 - 29 0 0 -13 32 54 16 42 3.1 58 117 45 -13 43 41 -13 22 6 -13 46 26 -13 19 22 -0.16 - 28 0 0 -13 43 58 16 42 6.8 59 117 44 -13 54 45 -13 33 12 -13 57 29 -13 30 27 -0.16 - 27 0 0 -13 54 36 16 42 10.5 60 117 43 -14 5 22 -13 43 51 -14 8 6 -13 41 6 -0.16 - 26 0 0 -14 4 47 16 42 14.3 61 117 43 -14 15 32 -13 54 2 -14 18 16 -13 51 18 -0.16 - 25 0 0 -14 14 32 16 42 18.1 62 118 42 -14 25 16 -14 3 48 -14 27 59 -14 1 4 -0.16 - 24 0 0 -14 23 49 16 42 21.9 63 118 41 -14 34 32 -14 13 6 -14 37 16 -14 10 22 -0.16 - 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9 59 2 -0.16 36 0 0 - 9 55 20 16 46 23.1 53 241 -19 -10 6 23 - 9 44 16 -10 9 12 - 9 41 27 -0.16 37 0 0 - 9 37 22 16 46 26.7 52 241 -20 - 9 48 27 - 9 26 17 - 9 51 16 - 9 23 28 -0.16 38 0 0 - 9 19 0 16 46 30.3 51 241 -21 - 9 30 6 - 9 7 54 - 9 32 55 - 9 5 5 -0.16 39 0 0 - 9 0 14 16 46 33.8 50 241 -22 - 9 11 21 - 8 49 7 - 9 14 10 - 8 46 17 -0.16 40 0 0 - 8 41 3 16 46 37.2 49 241 -23 - 8 52 12 - 8 29 55 - 8 55 2 - 8 27 5 -0.16 41 0 0 - 8 21 29 16 46 40.6 48 241 -24 - 8 32 39 - 8 10 20 - 8 35 29 - 8 7 29 -0.16 42 0 0 - 8 1 32 16 46 44.0 47 241 -25 - 8 12 42 - 7 50 21 - 8 15 33 - 7 47 30 -0.16 43 0 0 - 7 41 11 16 46 47.3 46 241 -26 - 7 52 23 - 7 29 59 - 7 55 14 - 7 27 8 -0.16 44 0 0 - 7 20 27 16 46 50.6 45 241 -28 - 7 31 41 - 7 9 14 - 7 34 32 - 7 6 22 -0.16 45 0 0 - 6 59 21 16 46 53.8 44 241 -29 - 7 10 36 - 6 48 7 - 7 13 27 - 6 45 15 -0.16 46 0 0 - 6 37 53 16 46 57.0 43 241 -30 - 6 49 9 - 6 26 37 - 6 52 1 - 6 23 45 -0.16 47 0 0 - 6 16 3 16 47 0.1 42 241 -31 - 6 27 20 - 6 4 46 - 6 30 12 - 6 1 53 -0.16 48 0 0 - 5 53 51 16 47 3.2 41 241 -32 - 6 5 10 - 5 42 33 - 6 8 2 - 5 39 40 -0.16 49 0 0 - 5 31 19 16 47 6.2 40 242 -33 - 5 42 38 - 5 19 59 - 5 45 31 - 5 17 6 -0.16 50 0 0 - 5 8 26 16 47 9.1 39 242 -34 - 5 19 46 - 4 57 5 - 5 22 39 - 4 54 11 -0.16 51 0 0 - 4 45 12 16 47 12.0 38 242 -35 - 4 56 34 - 4 33 50 - 4 59 28 - 4 30 56 -0.16 52 0 0 - 4 21 39 16 47 14.8 37 242 -36 - 4 33 2 - 4 10 16 - 4 35 56 - 4 7 22 -0.16 53 0 0 - 3 57 47 16 47 17.6 36 242 -37 - 4 9 11 - 3 46 22 - 4 12 5 - 3 43 28 -0.16 54 0 0 - 3 33 35 16 47 20.3 35 242 -38 - 3 45 1 - 3 22 10 - 3 47 55 - 3 19 15 -0.16 55 0 0 - 3 9 6 16 47 22.9 33 242 -39 - 3 20 32 - 2 57 39 - 3 23 27 - 2 54 44 -0.16 56 0 0 - 2 44 18 16 47 25.5 32 242 -40 - 2 55 46 - 2 32 50 - 2 58 41 - 2 29 55 -0.16 57 0 0 - 2 19 14 16 47 27.9 31 242 -41 - 2 30 43 - 2 7 45 - 2 33 38 - 2 4 49 -0.16 58 0 0 - 1 53 53 16 47 30.4 30 242 -42 - 2 5 22 - 1 42 22 - 2 8 18 - 1 39 27 -0.16 59 0 0 - 1 28 15 16 47 32.7 29 242 -44 - 1 39 46 - 1 16 44 - 1 42 42 - 1 13 48 -0.16 60 0 0 - 1 2 22 16 47 34.9 28 242 -45 - 1 13 54 - 0 50 50 - 1 16 50 - 0 47 53 -0.16 61 0 0 - 0 36 14 16 47 37.1 27 242 -46 - 0 47 47 - 0 24 41 - 0 50 43 - 0 21 44 -0.16 62 0 0 - 0 9 52 16 47 39.2 26 242 -47 - 0 21 26 0 1 42 - 0 24 22 0 4 39 -0.16 63 0 0 0 16 44 16 47 41.3 25 242 -48 0 5 9 0 28 19 0 2 12 0 31 16 -0.16 64 0 0 0 43 33 16 47 43.2 24 242 -49 0 31 57 0 55 9 0 29 0 0 58 6 -0.16 65 0 0 1 10 34 16 47 45.1 23 242 -50 0 58 58 1 22 11 0 56 0 1 25 9 -0.16 66 0 0 1 37 47 16 47 46.8 21 242 -51 1 26 10 1 49 25 1 23 12 1 52 23 -0.16 67 0 0 2 5 11 16 47 48.5 20 242 -52 1 53 33 2 16 50 1 50 35 2 19 48 -0.16 68 0 0 2 32 46 16 47 50.1 19 242 -53 2 21 7 2 44 25 2 18 9 2 47 23 -0.16 69 0 0 3 0 30 16 47 51.7 18 242 -54 2 48 50 3 12 10 2 45 52 3 15 8 -0.16 70 0 0 3 28 22 16 47 53.1 17 242 -55 3 16 42 3 40 3 3 13 44 3 43 2 -0.16 71 0 0 3 56 23 16 47 54.5 16 242 -56 3 44 42 4 8 5 3 41 44 4 11 3 -0.16 72 0 0 4 24 32 16 47 55.7 15 242 -57 4 12 50 4 36 14 4 9 51 4 39 12 -0.16 73 0 0 4 52 46 16 47 56.9 14 243 -58 4 41 4 5 4 29 4 38 6 5 7 28 -0.16 74 0 0 5 21 7 16 47 58.0 13 243 -59 5 9 25 5 32 50 5 6 26 5 35 49 -0.15 75 0 0 5 49 33 16 47 59.0 12 243 -60 5 37 50 6 1 17 5 34 51 6 4 16 -0.15 76 0 0 6 18 3 16 47 59.9 10 243 -61 6 6 20 6 29 47 6 3 21 6 32 47 -0.15 77 0 0 6 46 37 16 48 0.7 9 243 -62 6 34 53 6 58 22 6 31 54 7 1 21 -0.15 78 0 0 7 15 14 16 48 1.4 8 243 -64 7 3 30 7 26 58 7 0 31 7 29 58 -0.15 79 0 0 7 43 53 16 48 2.0 7 243 -65 7 32 8 7 55 37 7 29 9 7 58 37 -0.15 80 0 0 8 12 32 16 48 2.6 6 243 -65 8 0 48 8 24 17 7 57 49 8 27 17 -0.15 81 0 0 8 41 13 16 48 3.0 5 244 -66 8 29 28 8 52 58 8 26 29 8 55 58 -0.15 82 0 0 9 9 53 16 48 3.4 4 244 -67 8 58 8 9 21 38 8 55 9 9 24 38 -0.14 83 0 0 9 38 32 16 48 3.6 3 244 -68 9 26 47 9 50 17 9 23 48 9 53 17 -0.14 84 0 0 10 7 9 16 48 3.8 2 244 -69 9 55 24 10 18 54 9 52 25 10 21 54 -0.12 85 0 0 10 35 44 16 48 3.9 1 244 -70 10 23 59 10 47 29 10 20 59 10 50 28 -0.03 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6846-00307-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 08 03.3433 DE: -25 11 45.744 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 08 03.3432 DE: -25 11 45.744 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.0 * B mag [mag]: 11.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (435) Ella asteroid class: approx. diameter [km]: 39 approx. diameter ["]: 0.023 distance from Earth [AU]: 2.26620 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): 0.015", 0.003", 92.745° remarks: * orbital elements for (435)Ella : Mean anomaly = 315.2329966235 deg Arg. of pericenter = 333.4787170446 deg Long. of node = 23.1327233752 deg Inclination = 1.8157963788 deg Eccentricity = 0.1546109924 Semimajor axis = 2.4500213486 AU Perihelion dist = 2.0712211164 AU Mag: H = 10.40, G = 0.15 Epoch of elements : MJD 60593.69726484 TDT (2024 Oct 10.6973) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#952023Apr24,1.47,2024,10,10,16.734362,-0.007267,0.164628,14.771672,0.621545,0.005277,0.000044,-0.000001,0.000000 1.6008,-25.1936,-74.31,-7.01,False TYC 6846-00307-1,18.13426206,-25.1960400,11.35,11.02,10.84,0.0,0,,18.15957704,-25.1935551,4.08,3.82,0,0,0 435,Ella,15.08,38.555,2.2662,0,0,4.224,2.41,,2.0,0 0,315.0538,2024,10,10,333.4787,23.1327,1.8158,0.15461,2.45002,2.07122,10.40,5.0,0.15 1.127,0.0147,0.0027,93,0.0030,Known errors,0.82,0,-1,-1 20241010_0307-1,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org