IOTA/IOTA-ES occultation update for (2139) Makharadze / UCAC4 352-172540 event on 2024 Oct 16, 00:57 UT Visible from Summary ------- On 2024 Oct 16 UT, the 17.138743086298 km diameter asteroid (2139) Makharadze will occult a 11.2 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 5.85 mag to 17.05 mag (the magnitude of the asteroid) for at most 0.810 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 16, 00:53 - 2024 Oct 16, 01:00 * geocentric midpoint of event [JD]: 2460599.53967725 * magnitude of target star: 11.20 * magnitude drop [mag]: 5.85 * estimated maximum duration [s]: 0.810 * Moon: 97 % sunlit, 71° distance * Sun: 88° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 25 * 1 sigma uncertainty interval [path widths]: +/- 0.26 * 1 sigma uncertainty interval [seconds]: +/- 1.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.024, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.024", 0.003", 78°) * approx speed of asteroid's shadow [km/s]: 21.2702 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 352-172540 by 2139 Makharadze on 2024 Oct 16 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 140 0 0 -49 24 36 0 53 38.5 0 121 45 -49 32 25 -49 16 48 -49 36 33 .. .. .. .... 141 0 0 -49 47 57 0 53 38.6 1 120 45 -49 55 46 -49 40 8 -49 59 54 -49 36 2 0.82 142 0 0 -50 11 7 0 53 38.7 2 119 45 -50 18 56 -50 3 19 -50 23 4 -49 59 13 0.92 143 0 0 -50 34 7 0 53 38.9 2 118 45 -50 41 56 -50 26 18 -50 46 4 -50 22 12 0.96 144 0 0 -50 56 55 0 53 39.2 3 118 45 -51 4 44 -50 49 6 -51 8 52 -50 45 0 0.98 145 0 0 -51 19 30 0 53 39.5 4 117 45 -51 27 20 -51 11 43 -51 31 27 -51 7 37 0.99 146 0 0 -51 41 54 0 53 39.9 5 116 45 -51 49 43 -51 34 6 -51 53 50 -51 30 0 1.00 147 0 0 -52 4 4 0 53 40.4 5 115 45 -52 11 53 -51 56 17 -52 16 0 -51 52 11 1.00 148 0 0 -52 26 1 0 53 40.9 6 114 45 -52 33 50 -52 18 14 -52 37 57 -52 14 9 1.00 149 0 0 -52 47 44 0 53 41.5 7 114 45 -52 55 32 -52 39 57 -52 59 39 -52 35 52 1.01 150 0 0 -53 9 13 0 53 42.1 7 113 45 -53 17 0 -53 1 26 -53 21 7 -52 57 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41 37 -39 18 30 1.10 - 13 0 0 -39 5 49 1 0 33.1 9 252 -42 -39 13 23 -38 58 17 -39 17 23 -38 54 19 1.10 - 12 0 0 -38 41 45 1 0 34.0 8 251 -42 -38 49 18 -38 34 14 -38 53 17 -38 30 16 1.11 - 11 0 0 -38 17 51 1 0 34.9 7 251 -42 -38 25 22 -38 10 20 -38 29 21 -38 6 23 1.12 - 10 0 0 -37 54 6 1 0 35.6 6 250 -43 -38 1 37 -37 46 37 -38 5 35 -37 42 41 1.14 - 9 0 0 -37 30 33 1 0 36.3 5 249 -43 -37 38 2 -37 23 5 -37 41 59 -37 19 9 1.15 - 8 0 0 -37 7 11 1 0 36.9 4 249 -43 -37 14 39 -36 59 44 -37 18 36 -36 55 49 1.18 - 7 0 0 -36 44 1 1 0 37.3 3 248 -43 -36 51 28 -36 36 35 -36 55 24 -36 32 41 1.22 - 6 0 0 -36 21 5 1 0 37.7 3 248 -43 -36 28 30 -36 13 40 -36 32 26 -36 9 46 1.28 - 5 0 0 -35 58 22 1 0 38.0 2 247 -43 -36 5 46 -35 50 58 -36 9 41 -35 47 5 1.42 - 4 0 0 -35 35 53 1 0 38.1 1 246 -43 -35 43 16 -35 28 31 -35 47 10 -35 24 38 1.86 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 352-172540 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 29 06.8263 DE: -19 36 06.869 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 29 06.8263 DE: -19 36 06.869 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.2 * B mag [mag]: 11.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2139) Makharadze asteroid class: approx. diameter [km]: 17 approx. diameter ["]: 0.013 distance from Earth [AU]: 1.76840 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.024", 0.003", 78.3° remarks: * orbital elements for (2139)Makharadze : Mean anomaly = 358.1854497492 deg Arg. of pericenter = 67.4301173110 deg Long. of node = 256.1031651257 deg Inclination = 2.1794467993 deg Eccentricity = 0.1871878019 Semimajor axis = 2.4618951885 AU Perihelion dist = 2.0010584398 AU Mag: H = 13.01, G = 0.15 Epoch of elements : MJD 60599.03967734 TDT (2024 Oct 16.0397) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,0.81,2024,10,16,0.952254,0.097676,-0.705565,11.891708,1.649085,0.005211,0.000815,0.000000,0.000000 -106.6863,-19.5516,162.11,-9.00,False UCAC4 352-172540,19.48522957,-19.6019081,11.84,11.20,10.85,0.1,0,,19.50937613,-19.5515847,5.86,5.75,0,0,0 2139,Makharadze,17.05,17.267,1.7684,0,0,4.184,8.21,,1.6,0 0,357.9202,2024,10,15,67.4301,256.1032,2.1794,0.18719,2.46190,2.00106,13.01,5.0,0.15 1.263,0.0243,0.0032,78,0.0035,Known errors,0.75,0,-1,-1 20241016_172540,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:17 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org