IOTA/IOTA-ES occultation update for (735) Marghanna / UCAC4 234-132239 event on 2024 Jun 17, 15:23 UT Visible from Summary ------- On 2024 Jun 17 UT, the 73.622 km diameter asteroid (735) Marghanna will occult a 11.1 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.15 mag to 13.07 mag (the magnitude of the asteroid) for at most 6.440 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 Jun 17, 15:14 - 2024 Jun 17, 15:32 * geocentric midpoint of event [JD]: 2460479.14156029 * magnitude of target star: 11.08 * magnitude drop [mag]: 2.15 * estimated maximum duration [s]: 6.440 * Moon: 81 % sunlit, 52° distance * Sun: 160° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 79 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.019, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.005", 107°) * approx speed of asteroid's shadow [km/s]: 11.4322 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 234-132239 by 735 Marghanna on 2024 Jun 17 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 2 0 0 -30 8 56 15 32 32.7 0 142 15 .. .. .. -30 43 32 .. .. .. -30 56 40 .... 3 0 0 -31 15 58 15 32 32.4 2 142 14 -30 41 36 -31 50 33 -30 28 39 -32 3 40 0.32 4 0 0 -32 22 8 15 32 31.8 3 141 12 -31 47 48 -32 56 41 -31 34 52 -33 9 48 0.34 5 0 0 -33 27 23 15 32 30.8 4 141 11 -32 53 6 -34 1 53 -32 40 10 -34 14 59 0.34 6 0 0 -34 31 39 15 32 29.6 6 140 10 -33 57 25 -35 6 5 -33 44 31 -35 19 9 0.34 7 0 0 -35 34 53 15 32 28.0 7 139 8 -35 0 44 -36 9 14 -34 47 52 -36 22 17 0.34 8 0 0 -36 37 2 15 32 26.1 8 139 7 -36 2 59 -37 11 18 -35 50 9 -37 24 18 0.35 9 0 0 -37 38 5 15 32 24.0 10 138 6 -37 4 7 -38 12 13 -36 51 20 -38 25 12 0.35 10 0 0 -38 37 57 15 32 21.6 11 138 5 -38 4 7 -39 11 59 -37 51 23 -39 24 54 0.35 11 0 0 -39 36 39 15 32 19.0 12 137 3 -39 2 57 -40 10 32 -38 50 15 -40 23 25 0.35 12 0 0 -40 34 7 15 32 16.2 13 136 2 -40 0 34 -41 7 52 -39 47 56 -41 20 41 0.35 13 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15 228 -17 - 8 55 28 - 9 58 24 - 8 43 38 -10 10 22 0.37 -152 0 0 - 8 21 25 15 15 25.1 14 227 -16 - 7 50 15 - 8 52 45 - 7 38 29 - 9 4 38 0.38 -151 0 0 - 7 16 37 15 15 21.8 12 227 -14 - 6 45 39 - 7 47 44 - 6 33 59 - 7 59 32 0.38 -150 0 0 - 6 12 30 15 15 18.8 11 227 -13 - 5 41 46 - 6 43 23 - 5 30 10 - 6 55 7 0.39 -149 0 0 - 5 9 8 15 15 16.2 9 227 -12 - 4 38 37 - 5 39 47 - 4 27 6 - 5 51 25 0.39 -148 0 0 - 4 6 33 15 15 14.0 8 227 -10 - 3 36 15 - 4 36 59 - 3 24 50 - 4 48 31 0.40 -147 0 0 - 3 4 48 15 15 12.2 6 227 -9 - 2 34 44 - 3 34 59 - 2 23 24 - 3 46 27 0.41 -146 0 0 - 2 3 55 15 15 10.7 5 227 -8 - 1 34 5 - 2 33 53 - 1 22 50 - 2 45 15 0.43 -145 0 0 - 1 3 57 15 15 9.6 4 227 -6 - 0 34 21 - 1 33 41 - 0 23 11 - 1 44 57 0.47 -144 0 0 - 0 4 56 15 15 8.9 2 227 -5 0 24 26 - 0 34 25 0 35 30 - 0 45 36 0.54 -143 0 0 0 53 6 15 15 8.5 1 227 -4 1 22 14 0 23 51 1 33 13 0 12 46 0.90 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: UCAC4 234-132239 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 34 26.3539 DE: -43 17 54.917 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 34 26.3539 DE: -43 17 54.917 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.1 * B mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (735) Marghanna asteroid class: approx. diameter [km]: 74 approx. diameter ["]: 0.072 distance from Earth [AU]: 1.41520 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#59 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): 0.020", 0.005", 107.3° remarks: * orbital elements for (735)Marghanna : Mean anomaly = 309.4938035367 deg Arg. of pericenter = 309.9763621177 deg Long. of node = 42.9188270758 deg Inclination = 16.8670028385 deg Eccentricity = 0.3206259893 Semimajor axis = 2.7304257861 AU Perihelion dist = 1.8549803173 AU Mag: H = 9.84, G = 0.15 Epoch of elements : MJD 60478.64156091 TDT (2024 Jun 17.6416) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Apr24,6.44,2024,6,17,15.397447,0.134530,-0.324532,-5.960906,-2.470765,0.000248,0.001826,0.000001,0.000000 126.7224,-43.3158,-50.68,23.40,False UCAC4 234-132239,17.57398720,-43.2985880,11.17,11.08,11.03,0.0,0,,17.60379250,-43.3157851,2.15,1.81,0,0,0 735,Marghanna,13.07,73.622,1.4152,0,0,-3.394,-15.34,,4.2,0 0,309.3537,2024,6,17,309.9764,42.9188,16.8670,0.32063,2.73043,1.85498,9.84,5.0,0.15 1.189,0.0203,0.0050,107,0.0136,Known errors,0.69,0,-1,-1 20240617_132239,60139.39 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 09:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org