IOTA/IOTA-ES occultation update for (706) Hirundo / TYC 842-00927-1 event on 2024 Dec 03, 17:34 UT Visible from Summary ------- On 2024 Dec 03 UT, the 29.946 km diameter asteroid (706) Hirundo will occult a 11.9 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.82 mag to 16.73 mag (the magnitude of the asteroid) for at most 2.810 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 Dec 03, 17:25 - 2024 Dec 03, 17:44 * geocentric midpoint of event [JD]: 2460648.23259167 * magnitude of target star: 11.92 * magnitude drop [mag]: 4.82 * estimated maximum duration [s]: 2.810 * Moon: 6 % sunlit, 124° distance * Sun: 96° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 31 * 1 sigma uncertainty interval [path widths]: +/- 0.22 * 1 sigma uncertainty interval [seconds]: +/- 1.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.008, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.010", 0.003", 130°) * approx speed of asteroid's shadow [km/s]: 10.6552 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 842-00927-1 by 706 Hirundo on 2024 Dec 3 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 82 0 0 48 1 31 17 25 11.0 0 73 -62 47 52 53 48 10 9 47 49 6 48 13 57 .... 83 0 0 48 13 26 17 25 11.0 1 74 -62 48 4 50 48 22 3 48 1 3 48 25 50 -0.23 84 0 0 48 24 51 17 25 11.2 1 75 -62 48 16 16 48 33 26 48 12 30 48 37 12 -0.22 85 0 0 48 35 47 17 25 11.4 2 75 -62 48 27 13 48 44 20 48 23 28 48 48 6 -0.22 86 0 0 48 46 13 17 25 11.8 3 76 -62 48 37 41 48 54 45 48 33 56 48 58 30 -0.21 87 0 0 48 56 10 17 25 12.2 4 77 -62 48 47 40 49 4 41 48 43 55 49 8 25 -0.21 88 0 0 49 5 39 17 25 12.7 4 78 -62 48 57 10 49 14 8 48 53 26 49 17 52 -0.21 89 0 0 49 14 39 17 25 13.3 5 78 -62 49 6 11 49 23 7 49 2 28 49 26 50 -0.21 90 0 0 49 23 11 17 25 13.9 6 79 -62 49 14 44 49 31 37 49 11 2 49 35 20 -0.21 91 0 0 49 31 14 17 25 14.7 6 80 -62 49 22 49 49 39 40 49 19 7 49 43 22 -0.21 92 0 0 49 38 50 17 25 15.5 7 81 -62 49 30 26 49 47 15 49 26 45 49 50 57 -0.21 93 0 0 49 45 59 17 25 16.4 8 82 -62 49 37 36 49 54 22 49 33 55 49 58 4 -0.21 94 0 0 49 52 40 17 25 17.3 8 82 -62 49 44 18 50 1 3 49 40 37 50 4 43 -0.21 95 0 0 49 58 54 17 25 18.4 9 83 -62 49 50 33 50 7 15 49 46 53 50 10 56 -0.21 96 0 0 50 4 41 17 25 19.5 10 84 -62 49 56 21 50 13 1 49 52 41 50 16 41 -0.21 97 0 0 50 10 1 17 25 20.7 10 85 -62 50 1 41 50 18 21 49 58 2 50 22 0 -0.21 98 0 0 50 14 54 17 25 22.0 11 85 -62 50 6 35 50 23 13 50 2 56 50 26 52 -0.21 99 0 0 50 19 21 17 25 23.3 11 86 -62 50 11 3 50 27 39 50 7 24 50 31 18 -0.21 100 0 0 50 23 21 17 25 24.7 12 87 -62 50 15 3 50 31 39 50 11 25 50 35 17 -0.20 101 0 0 50 26 55 17 25 26.2 13 88 -62 50 18 38 50 35 12 50 15 0 50 38 50 -0.20 102 0 0 50 30 2 17 25 27.8 13 88 -61 50 21 46 50 38 19 50 18 8 50 41 57 -0.20 103 0 0 50 32 43 17 25 29.4 14 89 -61 50 24 27 50 41 0 50 20 50 50 44 38 -0.20 104 0 0 50 34 59 17 25 31.1 15 90 -61 50 26 43 50 43 14 50 23 5 50 46 52 -0.20 105 0 0 50 36 47 17 25 32.9 15 91 -61 50 28 32 50 45 3 50 24 55 50 48 41 -0.20 106 0 0 50 38 10 17 25 34.7 16 92 -61 50 29 55 50 46 26 50 26 18 50 50 3 -0.20 107 0 0 50 39 7 17 25 36.6 17 92 -60 50 30 52 50 47 22 50 27 15 50 51 0 -0.20 108 0 0 50 39 38 17 25 38.6 17 93 -60 50 31 23 50 47 53 50 27 46 50 51 31 -0.20 109 0 0 50 39 43 17 25 40.7 18 94 -60 50 31 28 50 47 58 50 27 51 50 51 35 -0.20 110 0 0 50 39 21 17 25 42.8 19 95 -60 50 31 6 50 47 36 50 27 29 50 51 14 -0.20 111 0 0 50 38 34 17 25 45.1 19 96 -59 50 30 19 50 46 49 50 26 42 50 50 27 -0.20 112 0 0 50 37 20 17 25 47.3 20 96 -59 50 29 5 50 45 36 50 25 28 50 49 13 -0.20 113 0 0 50 35 40 17 25 49.7 20 97 -59 50 27 25 50 43 56 50 23 48 50 47 34 -0.20 114 0 0 50 33 34 17 25 52.1 21 98 -58 50 25 19 50 41 50 50 21 41 50 45 28 -0.20 115 0 0 50 31 2 17 25 54.7 22 99 -58 50 22 46 50 39 18 50 19 8 50 42 56 -0.20 116 0 0 50 28 2 17 25 57.3 22 100 -58 50 19 46 50 36 19 50 16 8 50 39 57 -0.20 117 0 0 50 24 37 17 25 59.9 23 100 -57 50 16 20 50 32 54 50 12 42 50 36 32 -0.20 118 0 0 50 20 44 17 26 2.7 24 101 -57 50 12 27 50 29 2 50 8 48 50 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0 -23 33 37 17 44 36.9 8 286 76 -23 42 19 -23 24 55 -23 46 8 -23 21 5 -0.24 -103 0 0 -23 50 47 17 44 38.2 7 285 77 -23 59 27 -23 42 6 -24 3 15 -23 38 18 -0.24 -102 0 0 -24 7 15 17 44 39.4 6 285 77 -24 15 54 -23 58 37 -24 19 41 -23 54 49 -0.25 -101 0 0 -24 23 3 17 44 40.3 5 285 78 -24 31 40 -24 14 26 -24 35 27 -24 10 39 -0.25 -100 0 0 -24 38 11 17 44 41.1 4 284 79 -24 46 46 -24 29 36 -24 50 32 -24 25 49 -0.26 - 99 0 0 -24 52 39 17 44 41.7 3 284 80 -25 1 12 -24 44 5 -25 4 58 -24 40 19 -0.27 - 98 0 0 -25 6 27 17 44 42.1 2 283 81 -25 14 59 -24 57 54 -25 18 44 -24 54 9 -0.30 - 97 0 0 -25 19 35 17 44 42.4 1 283 82 -25 28 6 -25 11 4 -25 31 50 -25 7 20 -0.37 - 96 0 0 -25 32 5 17 44 42.5 0 283 82 -25 40 35 -25 23 36 -25 44 18 -25 19 52 -1.09 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: TYC 842-00927-1 * constellation : Leo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 10 34 06.2576 DE: +11 23 05.053 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 10 34 06.2578 DE: +11 23 05.052 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.9 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (706) Hirundo asteroid class: approx. diameter [km]: 30 approx. diameter ["]: 0.015 distance from Earth [AU]: 2.83360 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#49 date of fit: 2023 Apr 27 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): 0.010", 0.003", 130.505° remarks: * orbital elements for (706)Hirundo : Mean anomaly = 125.0698254523 deg Arg. of pericenter = 30.9448907312 deg Long. of node = 325.2673434695 deg Inclination = 14.4316238703 deg Eccentricity = 0.1957366513 Semimajor axis = 2.7270083681 AU Perihelion dist = 2.1932328821 AU Mag: H = 11.07, G = 0.15 Epoch of elements : MJD 60647.73259162 TDT (2024 Dec 03.7326) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr27,2.81,2024,12,3,17.582200,0.121297,0.158997,4.771142,-3.661390,-0.005576,0.002207,0.000000,0.000000 -177.9144,11.2561,-86.21,-22.24,False TYC 842-00927-1,10.56840487,11.3847372,12.26,11.92,11.74,0.0,0,,10.59040067,11.2560649,4.83,4.56,0,0,0 706,Hirundo,16.73,29.946,2.8336,0,0,1.007,-11.37,,2.0,0 0,124.9095,2024,12,3,30.9449,325.2673,14.4316,0.19574,2.72701,2.19323,11.07,5.0,0.15 1.220,0.0097,0.0032,130,0.0032,Known errors,1.10,0,-1,-1 20241203_0927-1,60140.72 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 17:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org