IOTA/IOTA-ES occultation update for (8081) Leopardi / TYC 6274-00739-1 event on 2024 Oct 14, 09:08 UT Visible from Summary ------- On 2024 Oct 14 UT, the 8.64862188215648 km diameter asteroid (8081) Leopardi will occult a 9.2 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 10.42 mag to 19.60 mag (the magnitude of the asteroid) for at most 0.340 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: 82 * date and approx. time of event: 2024 Oct 14, 09:04 - 2024 Oct 14, 09:12 * geocentric midpoint of event [JD]: 2460597.88077204 * magnitude of target star: 9.18 * magnitude drop [mag]: 10.42 * estimated maximum duration [s]: 0.340 * Moon: 86 % sunlit, 62° distance * Sun: 75° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 9 * 1 sigma uncertainty interval [path widths]: +/- 0.64 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.003", 97°) * approx speed of asteroid's shadow [km/s]: 25.6249 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6274-00739-1 by 8081 Leopardi on 2024 Oct 14 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 29 0 0 5 1 23 9 4 9.9 0 110 72 4 58 49 5 3 57 4 55 31 5 7 15 .... 30 0 0 4 38 54 9 4 10.0 1 110 73 4 36 20 4 41 28 4 33 1 4 44 46 0.13 31 0 0 4 16 14 9 4 10.1 2 111 74 4 13 40 4 18 48 4 10 21 4 22 7 0.10 32 0 0 3 53 24 9 4 10.3 3 111 75 3 50 50 3 55 58 3 47 31 3 59 17 0.08 33 0 0 3 30 24 9 4 10.7 4 111 76 3 27 50 3 32 59 3 24 31 3 36 17 0.08 34 0 0 3 7 15 9 4 11.1 6 111 77 3 4 41 3 9 50 3 1 22 3 13 9 0.07 35 0 0 2 43 58 9 4 11.6 7 111 78 2 41 23 2 46 33 2 38 4 2 49 52 0.07 36 0 0 2 20 32 9 4 12.1 8 111 78 2 17 58 2 23 7 2 14 38 2 26 26 0.07 37 0 0 1 56 59 9 4 12.8 9 111 79 1 54 25 1 59 34 1 51 5 2 2 54 0.07 38 0 0 1 33 19 9 4 13.5 10 111 80 1 30 44 1 35 54 1 27 25 1 39 14 0.06 39 0 0 1 9 33 9 4 14.4 11 111 80 1 6 58 1 12 7 1 3 38 1 15 27 0.06 40 0 0 0 45 40 9 4 15.3 12 111 81 0 43 5 0 48 15 0 39 45 0 51 35 0.06 41 0 0 0 21 42 9 4 16.3 13 111 81 0 19 7 0 24 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28 49 0.07 -157 0 0 -12 13 26 9 12 25.8 6 250 -64 -12 15 59 -12 10 53 -12 19 17 -12 7 35 0.08 -156 0 0 -11 52 0 9 12 26.2 5 250 -65 -11 54 34 -11 49 27 -11 57 51 -11 46 9 0.08 -155 0 0 -11 30 22 9 12 26.6 4 250 -66 -11 32 56 -11 27 49 -11 36 14 -11 24 31 0.09 -154 0 0 -11 8 33 9 12 26.8 3 250 -67 -11 11 6 -11 5 59 -11 14 24 -11 2 41 0.11 -153 0 0 -10 46 32 9 12 27.0 2 250 -68 -10 49 5 -10 43 58 -10 52 24 -10 40 40 0.14 -152 0 0 -10 24 20 9 12 27.1 1 249 -69 -10 26 54 -10 21 46 -10 30 12 -10 18 27 0.27 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6274-00739-1 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 24 12.9176 DE: -20 19 30.957 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 24 12.9173 DE: -20 19 30.957 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 9.2 * B mag [mag]: 9.5 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (8081) Leopardi asteroid class: approx. diameter [km]: 9 approx. diameter ["]: 0.004 distance from Earth [AU]: 2.65250 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#41 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): 0.011", 0.003", 96.81° remarks: * orbital elements for (8081)Leopardi : Mean anomaly = 120.9742707988 deg Arg. of pericenter = 29.2948467287 deg Long. of node = 132.0086526549 deg Inclination = 12.2710357154 deg Eccentricity = 0.1722375488 Semimajor axis = 2.3227916359 AU Perihelion dist = 1.9227196981 AU Mag: H = 14.37, G = 0.15 Epoch of elements : MJD 60597.38077179 TDT (2024 Oct 14.3808) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#412023Apr25,0.34,2024,10,14,9.138529,-0.005969,-0.046586,14.320033,-2.031320,0.005455,0.000325,0.000000,0.000000 115.9338,-20.3127,39.40,-8.39,False TYC 6274-00739-1,18.40358824,-20.3252658,9.47,9.18,9.02,0.1,0,,18.42798602,-20.3127326,10.42,10.13,0,0,0 8081,Leopardi,19.60,8.841,2.6525,0,0,3.375,-6.73,,0.8,0 0,120.8683,2024,10,14,29.2948,132.0087,12.2710,0.17224,2.32279,1.92272,14.37,5.0,0.15 1.645,0.0113,0.0029,97,0.0029,Known errors,0.78,0,-1,-1 20241014_0739-1,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org