IOTA/IOTA-ES occultation update for (735) Marghanna / UCAC4 228-132562 event on 2024 Jul 15, 08:11 UT Visible from Summary ------- On 2024 Jul 15 UT, the 73.5964428352051 km diameter asteroid (735) Marghanna will occult a 11.5 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 2.01 mag to 13.30 mag (the magnitude of the asteroid) for at most 11.220 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 Jul 15, 07:56 - 2024 Jul 15, 08:26 * geocentric midpoint of event [JD]: 2460506.84129659 * magnitude of target star: 11.48 * magnitude drop [mag]: 2.01 * estimated maximum duration [s]: 11.220 * Moon: 63 % sunlit, 44° distance * Sun: 140° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 83 * 1 sigma uncertainty interval [path widths]: +/- 0.12 * 1 sigma uncertainty interval [seconds]: +/- 2.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.009) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.005", 116°) * approx speed of asteroid's shadow [km/s]: 6.5788 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 228-132562 by 735 Marghanna on 2024 Jul 15 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 89 0 0 -17 15 54 8 25 47.9 1 137 39 -16 43 30 -17 48 31 -16 35 49 -17 56 18 .... 90 0 0 -18 18 26 8 25 47.2 2 137 38 -17 45 49 -18 51 16 -17 38 5 -18 59 7 0.42 91 0 0 -19 21 21 8 25 45.8 4 136 36 -18 48 31 -19 54 24 -18 40 44 -20 2 17 0.44 92 0 0 -20 24 34 8 25 43.8 5 136 35 -19 51 33 -20 57 50 -19 43 43 -21 5 46 0.44 93 0 0 -21 28 3 8 25 41.1 6 136 33 -20 54 50 -22 1 30 -20 46 57 -22 9 30 0.45 94 0 0 -22 31 43 8 25 37.7 8 135 32 -21 58 18 -23 5 22 -21 50 23 -23 13 25 0.45 95 0 0 -23 35 31 8 25 33.8 9 135 31 -23 1 55 -24 9 22 -22 53 58 -24 17 27 0.46 96 0 0 -24 39 23 8 25 29.2 11 134 29 -24 5 37 -25 13 24 -23 57 37 -25 21 32 0.46 97 0 0 -25 43 15 8 25 24.0 12 134 28 -25 9 19 -26 17 26 -25 1 17 -26 25 37 0.46 98 0 0 -26 47 3 8 25 18.2 13 133 27 -26 12 58 -27 21 24 -26 4 53 -27 29 37 0.46 99 0 0 -27 50 44 8 25 11.9 15 133 25 -27 16 29 -28 25 14 -27 8 23 -28 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225 -32 -30 46 48 -31 56 50 -30 38 32 -32 5 15 0.51 - 52 0 0 -30 18 6 7 57 28.4 11 224 -31 -29 43 19 -30 53 8 -29 35 5 -31 1 31 0.52 - 51 0 0 -29 14 9 7 57 23.8 9 224 -30 -28 39 30 -29 49 5 -28 31 18 -29 57 26 0.53 - 50 0 0 -28 9 56 7 57 19.7 8 223 -29 -27 35 25 -28 44 43 -27 27 14 -28 53 2 0.54 - 49 0 0 -27 5 28 7 57 16.3 7 223 -28 -26 31 6 -27 40 6 -26 22 57 -27 48 23 0.55 - 48 0 0 -26 0 51 7 57 13.4 5 223 -27 -25 26 38 -26 35 20 -25 18 32 -26 43 35 0.57 - 47 0 0 -24 56 9 7 57 11.2 4 222 -26 -24 22 5 -25 30 28 -24 14 1 -25 38 40 0.61 - 46 0 0 -23 51 25 7 57 9.6 3 222 -24 -23 17 32 -24 25 33 -23 9 30 -24 33 43 0.68 - 45 0 0 -22 46 44 7 57 8.7 1 221 -23 -22 13 2 -23 20 41 -22 5 3 -23 28 47 0.96 - 44 0 0 .. .. .... .. .. .. .. .. .. .. .. .. -22 15 54 .. .. .. -22 23 58 .... Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 228-132562 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 00 39.3583 DE: -44 27 38.204 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 00 39.3583 DE: -44 27 38.204 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.5 * B mag [mag]: 13.0 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (735) Marghanna asteroid class: approx. diameter [km]: 74 approx. diameter ["]: 0.071 distance from Earth [AU]: 1.42400 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): 0.019", 0.005", 116.15° remarks: * orbital elements for (735)Marghanna : Mean anomaly = 315.5418725759 deg Arg. of pericenter = 309.9788720508 deg Long. of node = 42.9184585896 deg Inclination = 16.8669060320 deg Eccentricity = 0.3206115823 Semimajor axis = 2.7303613044 AU Perihelion dist = 1.8549758464 AU Mag: H = 9.84, G = 0.15 Epoch of elements : MJD 60506.34129755 TDT (2024 Jul 15.3413) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#592023Apr24,11.22,2024,7,15,8.191118,-0.031241,-0.460310,-3.704776,0.251185,0.003179,0.001282,0.000001,0.000000 -160.9291,-44.4990,58.65,21.42,False UCAC4 228-132562,17.01093288,-44.4606122,12.99,11.48,10.66,0.2,0,,17.04086278,-44.4989720,2.00,2.32,0,0,0 735,Marghanna,13.30,73.803,1.4240,0,0,-2.137,1.56,,4.2,0 0,315.4673,2024,7,15,309.9789,42.9185,16.8669,0.32061,2.73036,1.85498,9.84,5.0,0.15 1.119,0.0193,0.0047,116,0.0085,Known errors,0.83,0,-1,-1 20240715_132562,60140.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org