IOTA/IOTA-ES occultation update for (13808) Davewilliams / TYC 6829-00398-1 event on 2024 Oct 11, 19:32 UT Visible from Summary ------- On 2024 Oct 11 UT, the 22.7278508173627 km diameter asteroid (13808) Davewilliams will occult a 10.1 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 8.25 mag to 18.32 mag (the magnitude of the asteroid) for at most 0.790 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 11, 19:28 - 2024 Oct 11, 19:36 * geocentric midpoint of event [JD]: 2460595.31422266 * magnitude of target star: 10.07 * magnitude drop [mag]: 8.25 * estimated maximum duration [s]: 0.790 * Moon: 61 % sunlit, 39° distance * Sun: 63° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.017, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.018", 0.003", 80°) * approx speed of asteroid's shadow [km/s]: 28.9474 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6829-00398-1 by 13808 Davewilliams on 2024 Oct 11 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 -138 0 0 6 54 33 19 28 55.6 0 116 63 6 47 23 7 1 43 6 42 58 7 6 9 .... -137 0 0 6 25 8 19 28 55.6 1 116 65 6 17 59 6 32 18 6 13 34 6 36 43 -0.02 -136 0 0 5 55 54 19 28 55.7 2 116 66 5 48 46 6 3 3 5 44 21 6 7 28 -0.13 -135 0 0 5 26 53 19 28 56.0 3 117 67 5 19 45 5 34 1 5 15 21 5 38 25 -0.17 -134 0 0 4 58 4 19 28 56.3 5 117 68 4 50 56 5 5 12 4 46 33 5 9 36 -0.19 -133 0 0 4 29 29 19 28 56.7 6 117 69 4 22 22 4 36 36 4 17 59 4 40 59 -0.20 -132 0 0 4 1 8 19 28 57.1 7 117 70 3 54 2 4 8 14 3 49 39 4 12 37 -0.21 -131 0 0 3 33 2 19 28 57.7 8 117 71 3 25 56 3 40 7 3 21 34 3 44 30 -0.22 -130 0 0 3 5 12 19 28 58.3 9 117 72 2 58 7 3 12 16 2 53 45 3 16 39 -0.22 -129 0 0 2 37 38 19 28 59.1 10 117 73 2 30 34 2 44 42 2 26 13 2 49 4 -0.22 -128 0 0 2 10 21 19 28 59.9 11 117 74 2 3 18 2 17 24 1 58 57 2 21 46 -0.23 -127 0 0 1 43 22 19 29 0.8 12 117 75 1 36 20 1 50 25 1 32 0 1 54 46 -0.23 -126 0 0 1 16 42 19 29 1.7 13 117 76 1 9 40 1 23 43 1 5 20 1 28 4 -0.23 -125 0 0 0 50 20 19 29 2.8 14 117 78 0 43 20 0 57 21 0 39 0 1 1 41 -0.23 -124 0 0 0 24 18 19 29 3.9 16 117 79 0 17 18 0 31 18 0 12 59 0 35 37 -0.23 -123 0 0 - 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Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6829-00398-1 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 24 45.5816 DE: -25 59 25.565 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 24 45.5815 DE: -25 59 25.565 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.1 * B mag [mag]: 10.6 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (13808) Davewilliams asteroid class: approx. diameter [km]: 23 approx. diameter ["]: 0.009 distance from Earth [AU]: 3.61450 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#53 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): 0.018", 0.003", 80.274° remarks: * orbital elements for (13808)Davewilliams : Mean anomaly = 255.1112314059 deg Arg. of pericenter = 102.2997071979 deg Long. of node = 289.6456044207 deg Inclination = 14.6695498388 deg Eccentricity = 0.0896449541 Semimajor axis = 3.1955036398 AU Perihelion dist = 2.9090428626 AU Mag: H = 12.09, G = 0.15 Epoch of elements : MJD 60594.81422255 TDT (2024 Oct 11.8142) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#532023Apr25,0.79,2024,10,11,19.541344,-0.029654,0.248404,16.224747,1.926645,0.005221,-0.000432,-0.000001,0.000000 -52.4285,-26.0138,-116.49,-7.43,False TYC 6829-00398-1,17.41266160,-25.9904348,10.60,10.07,9.78,0.1,0,,17.43800105,-26.0137535,8.25,8.08,0,0,0 13808,Davewilliams,18.32,22.990,3.6145,0,0,2.929,4.69,,2.0,0 0,254.9707,2024,10,11,102.2997,289.6456,14.6695,0.08964,3.19550,2.90904,12.08,5.0,0.15 1.308,0.0177,0.0025,80,0.0027,Known errors,0.81,0,-1,-1 20241011_0398-1,60140.63 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org