IOTA/IOTA-ES occultation update for (1736) Floirac / TYC 791-01182-1 event on 2024 Dec 28, 12:12 UT Visible from Summary ------- On 2024 Dec 28 UT, the 9.06833973514256 km diameter asteroid (1736) Floirac will occult a 11.0 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.61 mag to 14.54 mag (the magnitude of the asteroid) for at most 1.270 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 28, 11:59 - 2024 Dec 28, 12:26 * geocentric midpoint of event [JD]: 2460673.00887979 * magnitude of target star: 10.97 * magnitude drop [mag]: 3.61 * estimated maximum duration [s]: 1.270 * Moon: 7 % sunlit, 129° distance * Sun: 158° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 10 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.026", 0.001", 97°) * approx speed of asteroid's shadow [km/s]: 7.2037 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 791-01182-1 by 1736 Floirac on 2024 Dec 28 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 108 0 0 - 9 22 46 12 26 14.4 1 76 -18 - 9 19 57 - 9 25 35 - 9 18 13 - 9 27 19 .... 109 0 0 - 9 8 21 12 26 14.0 2 76 -19 - 9 5 32 - 9 11 10 - 9 3 48 - 9 12 53 0.29 110 0 0 - 8 54 16 12 26 13.3 3 76 -20 - 8 51 27 - 8 57 4 - 8 49 44 - 8 58 48 0.35 111 0 0 - 8 40 31 12 26 12.3 4 75 -21 - 8 37 43 - 8 43 19 - 8 35 59 - 8 45 3 0.38 112 0 0 - 8 27 7 12 26 11.0 5 75 -22 - 8 24 19 - 8 29 55 - 8 22 36 - 8 31 38 0.40 113 0 0 - 8 14 3 12 26 9.4 6 75 -23 - 8 11 15 - 8 16 51 - 8 9 32 - 8 18 34 0.41 114 0 0 - 8 1 21 12 26 7.5 7 75 -24 - 7 58 33 - 8 4 8 - 7 56 50 - 8 5 51 0.42 115 0 0 - 7 48 59 12 26 5.3 8 75 -25 - 7 46 12 - 7 51 47 - 7 44 29 - 7 53 29 0.42 116 0 0 - 7 36 58 12 26 2.8 9 75 -26 - 7 34 11 - 7 39 46 - 7 32 29 - 7 41 28 0.43 117 0 0 - 7 25 19 12 26 0.1 10 75 -27 - 7 22 32 - 7 28 6 - 7 20 49 - 7 29 49 0.43 118 0 0 - 7 14 1 12 25 57.1 11 74 -27 - 7 11 14 - 7 16 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33 -36 6 20 -35 58 47 -36 8 6 0.49 - 84 0 0 -36 19 46 11 59 23.2 4 290 18 -36 16 53 -36 22 39 -36 15 7 -36 24 25 0.49 - 83 0 0 -36 35 52 11 59 22.4 3 290 18 -36 32 59 -36 38 45 -36 31 13 -36 40 31 0.49 - 82 0 0 -36 51 43 11 59 21.7 2 289 19 -36 48 51 -36 54 36 -36 47 5 -36 56 22 0.50 - 81 0 0 -37 7 20 11 59 21.3 1 289 20 -37 4 28 -37 10 12 -37 2 42 -37 11 58 0.52 - 80 0 0 -37 22 42 11 59 21.0 1 288 21 -37 19 50 -37 25 34 -37 18 5 -37 27 20 0.60 Uncertainty in time = +/- 3 secs Prediction of 2023 Jul 15.8 Data for the target star ------------------------ * name: TYC 791-01182-1 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 54 00.1615 DE: +13 52 10.078 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 54 00.1615 DE: +13 52 10.078 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.0 * B mag [mag]: 11.6 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1736) Floirac asteroid class: approx. diameter [km]: 9 approx. diameter ["]: 0.012 distance from Earth [AU]: 1.04320 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 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): 0.026", 0.001", 96.512° remarks: * orbital elements for (1736)Floirac : Mean anomaly = 43.1758719889 deg Arg. of pericenter = 249.1936977379 deg Long. of node = 159.6883535729 deg Inclination = 4.5524747558 deg Eccentricity = 0.1693986659 Semimajor axis = 2.2288101086 AU Perihelion dist = 1.8512526497 AU Mag: H = 12.28, G = 0.15 Epoch of elements : MJD 60672.50888204 TDT (2024 Dec 28.5089) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr24,1.27,2024,12,28,12.213115,-0.102273,-0.397499,-3.937659,1.013391,-0.001822,0.000987,0.000001,0.000000 -161.7985,13.8040,-2.75,-23.24,False TYC 791-01182-1,7.90004486,13.8694662,11.61,10.97,10.62,0.1,0,,7.92377479,13.8039815,3.61,3.51,0,0,0 1736,Floirac,14.54,9.144,1.0432,0,0,-2.279,8.54,,0.6,0 0,43.0251,2024,12,28,249.1937,159.6884,4.5525,0.16940,2.22881,1.85125,12.28,5.0,0.15 1.307,0.0257,0.0011,97,0.0037,Known errors,1.17,0,-1,-1 20241228_1182-1,60140.76 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 18:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org