IOTA/IOTA-ES occultation update for (7131) Longtom / UCAC4 307-123211 event on 2024 Oct 09, 09:42 UT Visible from Summary ------- On 2024 Oct 09 UT, the 31.6238488643767 km diameter asteroid (7131) Longtom will occult a 11.4 mag star in the constellation Ophiuchus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 6.45 mag to 17.81 mag (the magnitude of the asteroid) for at most 1.210 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 09, 09:38 - 2024 Oct 09, 09:45 * geocentric midpoint of event [JD]: 2460592.90418104 * magnitude of target star: 11.36 * magnitude drop [mag]: 6.45 * estimated maximum duration [s]: 1.210 * Moon: 37 % sunlit, 9° distance * Sun: 66° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 33 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.019", 0.002", 112°) * approx speed of asteroid's shadow [km/s]: 27.4749 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 307-123211 by 7131 Longtom on 2024 Oct 9 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 14 0 0 .. .. .... .. .. .. .. .. .. 10 14 24 .. .. .. 10 7 22 .. .. .. .... 15 0 0 9 51 32 9 38 9.7 1 119 66 9 41 10 10 1 55 9 34 8 10 8 57 .... 16 0 0 9 18 6 9 38 9.8 2 119 67 9 7 43 9 28 29 9 0 40 9 35 32 0.03 17 0 0 8 44 29 9 38 10.1 3 120 68 8 34 5 8 54 53 8 27 2 9 1 56 0.00 18 0 0 8 10 41 9 38 10.4 4 120 70 8 0 17 8 21 5 7 53 13 8 28 9 -0.01 19 0 0 7 36 43 9 38 10.8 6 120 71 7 26 19 7 47 8 7 19 15 7 54 12 -0.02 20 0 0 7 2 37 9 38 11.3 7 120 72 6 52 12 7 13 3 6 45 8 7 20 7 -0.03 21 0 0 6 28 24 9 38 11.9 8 120 73 6 17 58 6 38 49 6 10 54 6 45 54 -0.03 22 0 0 5 54 4 9 38 12.6 9 120 74 5 43 38 6 4 30 5 36 33 6 11 34 -0.03 23 0 0 5 19 38 9 38 13.3 10 120 75 5 9 12 5 30 4 5 2 7 5 37 9 -0.03 24 0 0 4 45 8 9 38 14.2 11 120 76 4 34 41 4 55 34 4 27 37 5 2 39 -0.04 25 0 0 4 10 34 9 38 15.2 13 121 77 4 0 8 4 21 1 3 53 3 4 28 6 -0.04 26 0 0 3 35 58 9 38 16.2 14 121 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55 - 5 47 27 -0.02 -174 0 0 - 5 32 24 9 45 52.7 3 242 -63 - 5 42 41 - 5 22 7 - 5 49 40 - 5 15 9 -0.01 -173 0 0 - 4 59 53 9 45 52.9 2 241 -64 - 5 10 11 - 4 49 35 - 5 17 10 - 4 42 35 0.02 -172 0 0 - 4 27 7 9 45 53.0 1 241 -65 - 4 37 26 - 4 16 48 - 4 44 26 - 4 9 48 0.13 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 307-123211 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 23 54.5937 DE: -28 36 23.760 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 23 54.5937 DE: -28 36 23.760 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.500,0.400) * V mag [mag]: 11.4 * B mag [mag]: 13.6 * Diameter [mas]: 0.70 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (7131) Longtom asteroid class: approx. diameter [km]: 32 approx. diameter ["]: 0.013 distance from Earth [AU]: 3.34880 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#52 date of fit: 2023 Apr 25 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", 0.001", 111.663° remarks: * orbital elements for (7131)Longtom : Mean anomaly = 290.0535185366 deg Arg. of pericenter = 290.7470340858 deg Long. of node = 78.4680789443 deg Inclination = 16.1442121244 deg Eccentricity = 0.1681146827 Semimajor axis = 3.1773442836 AU Perihelion dist = 2.6431860575 AU Mag: H = 11.83, G = 0.15 Epoch of elements : MJD 60592.40418075 TDT (2024 Oct 09.4042) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#522023Apr25,1.21,2024,10,9,9.700345,0.008464,0.061608,15.348352,-2.216762,0.005293,-0.000545,-0.000001,0.000000 97.3573,-28.6306,31.29,-6.52,False UCAC4 307-123211,17.39849829,-28.6065999,13.60,11.36,10.15,0.7,0,,17.42435750,-28.6306418,6.45,7.21,0,0,0 7131,Longtom,17.81,33.324,3.3488,0,0,3.062,-5.82,,2.6,0 0,289.9832,2024,10,9,290.7470,78.4681,16.1442,0.16811,3.17734,2.64319,11.83,5.0,0.15 1.339,0.0190,0.0015,112,0.0047,Known errors,0.74,0,-1,-1 20241009_123211,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:55 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org