IOTA/IOTA-ES occultation update for (2911) Miahelena / TYC 4690-00113-1 event on 2024 Oct 27, 18:36 UT Visible from Summary ------- On 2024 Oct 27 UT, the 12.7307229865417 km diameter asteroid (2911) Miahelena will occult a 9.0 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 7.27 mag to 16.24 mag (the magnitude of the asteroid) for at most 0.930 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: 88 * date and approx. time of event: 2024 Oct 27, 18:29 - 2024 Oct 27, 18:43 * geocentric midpoint of event [JD]: 2460611.27512784 * magnitude of target star: 8.97 * magnitude drop [mag]: 7.27 * estimated maximum duration [s]: 0.930 * Moon: 19 % sunlit, 131° distance * Sun: 167° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 15 * 1 sigma uncertainty interval [path widths]: +/- 0.55 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.017", 0.004", 73°) * approx speed of asteroid's shadow [km/s]: 13.7950 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4690-00113-1 by 2911 Miahelena on 2024 Oct 27 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 - 13 0 0 -52 57 43 18 42 52.2 0 89 9 -52 53 43 -53 1 43 -52 49 20 -53 6 7 .... - 12 0 0 -52 57 20 18 42 52.1 1 89 9 -52 53 20 -53 1 20 -52 48 56 -53 5 44 0.37 - 11 0 0 -52 56 39 18 42 52.0 2 88 8 -52 52 39 -53 0 40 -52 48 16 -53 5 4 0.45 - 10 0 0 -52 55 42 18 42 51.8 2 87 8 -52 51 41 -52 59 42 -52 47 18 -53 4 6 0.48 - 9 0 0 -52 54 27 18 42 51.6 3 86 7 -52 50 26 -52 58 27 -52 46 3 -53 2 51 0.50 - 8 0 0 -52 52 55 18 42 51.3 3 85 6 -52 48 54 -52 56 55 -52 44 30 -53 1 19 0.51 - 7 0 0 -52 51 5 18 42 51.0 4 85 6 -52 47 5 -52 55 6 -52 42 41 -52 59 30 0.52 - 6 0 0 -52 48 59 18 42 50.5 5 84 5 -52 44 58 -52 53 0 -52 40 34 -52 57 24 0.53 - 5 0 0 -52 46 35 18 42 50.1 5 83 5 -52 42 34 -52 50 36 -52 38 10 -52 55 1 0.53 - 4 0 0 -52 43 54 18 42 49.5 6 82 4 -52 39 53 -52 47 55 -52 35 29 -52 52 20 0.53 - 3 0 0 -52 40 56 18 42 48.9 6 82 3 -52 36 55 -52 44 57 -52 32 30 -52 49 22 0.54 - 2 0 0 -52 37 41 18 42 48.3 7 81 3 -52 33 39 -52 41 42 -52 29 15 -52 46 7 0.54 - 1 0 0 -52 34 8 18 42 47.6 8 80 2 -52 30 6 -52 38 10 -52 25 41 -52 42 35 0.54 0 0 0 -52 30 18 18 42 46.8 8 79 2 -52 26 16 -52 34 20 -52 21 51 -52 38 45 0.54 1 0 0 -52 26 10 18 42 46.0 9 78 1 -52 22 8 -52 30 12 -52 17 43 -52 34 38 0.55 2 0 0 -52 21 46 18 42 45.1 9 78 0 -52 17 43 -52 25 48 -52 13 18 -52 30 14 0.55 3 0 0 -52 17 3 18 42 44.1 10 77 0 -52 13 1 -52 21 6 -52 8 35 -52 25 32 0.55 4 0 0 -52 12 3 18 42 43.1 11 76 -1 -52 8 1 -52 16 6 -52 3 34 -52 20 33 0.55 5 0 0 -52 6 46 18 42 42.0 11 75 -1 -52 2 43 -52 10 49 -51 58 17 -52 15 16 0.55 6 0 0 -52 1 11 18 42 40.8 12 74 -2 -51 57 8 -52 5 15 -51 52 41 -52 9 42 0.55 7 0 0 -51 55 19 18 42 39.6 12 74 -3 -51 51 15 -51 59 23 -51 46 48 -52 3 50 0.55 8 0 0 -51 49 9 18 42 38.3 13 73 -3 -51 45 5 -51 53 13 -51 40 37 -51 57 41 0.55 9 0 0 -51 42 41 18 42 37.0 14 72 -4 -51 38 37 -51 46 45 -51 34 9 -51 51 14 0.55 10 0 0 -51 35 55 18 42 35.6 14 71 -4 -51 31 51 -51 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0 - 6 24 16 18 29 28.8 1 270 2 - 6 20 15 - 6 28 17 - 6 15 50 - 6 32 42 0.96 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 4690-00113-1 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 02 13 32.6601 DE: -00 01 07.111 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 02 13 32.6601 DE: -00 01 07.112 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 9.0 * B mag [mag]: 9.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2911) Miahelena asteroid class: approx. diameter [km]: 13 approx. diameter ["]: 0.008 distance from Earth [AU]: 2.08580 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): 0.017", 0.004", 73.018° remarks: * orbital elements for (2911)Miahelena : Mean anomaly = 179.0944326175 deg Arg. of pericenter = 64.1297549024 deg Long. of node = 149.1968126499 deg Inclination = 9.6157196058 deg Eccentricity = 0.0962175748 Semimajor axis = 2.7932303347 AU Perihelion dist = 2.5244724861 AU Mag: H = 11.84, G = 0.15 Epoch of elements : MJD 60610.77512671 TDT (2024 Oct 27.7751) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#542023Apr24,0.93,2024,10,27,18.603068,0.194018,-0.453178,-7.158014,-3.064168,-0.000137,0.001325,0.000001,0.000001 78.0527,0.0996,-103.09,-13.13,False TYC 4690-00113-1,2.22573892,-0.0186419,9.50,8.97,8.68,0.1,0,,2.24726016,0.0995785,7.28,7.11,0,0,0 2911,Miahelena,16.24,12.882,2.0858,0,0,-2.012,-12.92,,1.0,0 0,178.9308,2024,10,27,64.1298,149.1968,9.6157,0.09622,2.79323,2.52447,11.84,5.0,0.15 1.549,0.0170,0.0043,73,0.0047,Known errors,1.05,0,-1,-1 20241027_0113-1,60140.66 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:54 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org