IOTA/IOTA-ES occultation update for (13859) Fredtreasure / TYC 6835-00565-1 event on 2024 Oct 18, 19:58 UT Visible from Summary ------- On 2024 Oct 18 UT, the 15.959 km diameter asteroid (13859) Fredtreasure will occult a 12.0 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 5.98 mag to 17.95 mag (the magnitude of the asteroid) for at most 0.470 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 18, 19:55 - 2024 Oct 18, 20:01 * geocentric midpoint of event [JD]: 2460602.33223296 * magnitude of target star: 11.97 * magnitude drop [mag]: 5.98 * estimated maximum duration [s]: 0.470 * Moon: 97 % sunlit, 140° distance * Sun: 60° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.31 * 1 sigma uncertainty interval [seconds]: +/- 0.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.013, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 80°) * approx speed of asteroid's shadow [km/s]: 33.6148 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6835-00565-1 by 13859 Fredtreasure on 2024 Oct 18 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 -146 0 0 9 0 1 19 55 23.6 1 117 60 8 54 58 9 5 4 8 51 53 9 8 10 .... -145 0 0 8 30 14 19 55 23.7 2 117 61 8 25 11 8 35 17 8 22 7 8 38 22 -0.10 -144 0 0 8 0 40 19 55 23.8 3 117 62 7 55 37 8 5 42 7 52 33 8 8 47 -0.18 -143 0 0 7 31 18 19 55 24.0 4 117 63 7 26 16 7 36 20 7 23 12 7 39 24 -0.22 -142 0 0 7 2 9 19 55 24.3 5 117 64 6 57 8 7 7 11 6 54 4 7 10 15 -0.23 -141 0 0 6 33 16 19 55 24.7 6 117 65 6 28 15 6 38 17 6 25 11 6 41 20 -0.25 -140 0 0 6 4 37 19 55 25.1 7 118 66 5 59 37 6 9 37 5 56 34 6 12 41 -0.26 -139 0 0 5 36 14 19 55 25.6 8 118 67 5 31 15 5 41 14 5 28 12 5 44 17 -0.26 -138 0 0 5 8 8 19 55 26.2 9 118 68 5 3 9 5 13 7 5 0 7 5 16 10 -0.27 -137 0 0 4 40 19 19 55 26.9 10 118 69 4 35 21 4 45 18 4 32 19 4 48 20 -0.27 -136 0 0 4 12 48 19 55 27.6 12 118 71 4 7 51 4 17 46 4 4 49 4 20 49 -0.27 -135 0 0 3 45 36 19 55 28.4 13 118 72 3 40 39 3 50 34 3 37 37 3 53 35 -0.28 -134 0 0 3 18 43 19 55 29.2 14 118 73 3 13 47 3 23 40 3 10 45 3 26 41 -0.28 -133 0 0 2 52 10 19 55 30.2 15 118 73 2 47 14 2 57 6 2 44 13 3 0 7 -0.28 -132 0 0 2 25 57 19 55 31.2 16 118 74 2 21 2 2 30 53 2 18 2 2 33 53 -0.28 -131 0 0 2 0 6 19 55 32.2 17 118 75 1 55 11 2 5 1 1 52 11 2 8 1 -0.28 -130 0 0 1 34 36 19 55 33.4 18 118 76 1 29 41 1 39 30 1 26 42 1 42 30 -0.28 -129 0 0 1 9 28 19 55 34.6 19 118 77 1 4 34 1 14 21 1 1 35 1 17 21 -0.29 -128 0 0 0 44 42 19 55 35.9 20 118 78 0 39 49 0 49 35 0 36 51 0 52 34 -0.29 -127 0 0 0 20 20 19 55 37.2 21 119 79 0 15 28 0 25 12 0 12 29 0 28 11 -0.29 -126 0 0 - 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16 0 0 4 53 15 20 0 49.5 35 233 -18 4 48 16 4 58 14 4 45 13 5 1 17 -0.30 - 15 0 0 5 21 23 20 0 51.7 34 233 -20 5 16 23 5 26 23 5 13 20 5 29 26 -0.30 - 14 0 0 5 49 48 20 0 53.8 33 233 -21 5 44 48 5 54 49 5 41 44 5 57 52 -0.30 - 13 0 0 6 18 30 20 0 55.9 32 233 -22 6 13 29 6 23 31 6 10 25 6 26 35 -0.30 - 12 0 0 6 47 28 20 0 57.9 31 234 -23 6 42 26 6 52 29 6 39 22 6 55 34 -0.30 - 11 0 0 7 16 40 20 0 59.8 30 234 -24 7 11 38 7 21 43 7 8 34 7 24 47 -0.30 - 10 0 0 7 46 8 20 1 1.7 29 234 -25 7 41 5 7 51 10 7 38 0 7 54 15 -0.30 - 9 0 0 8 15 48 20 1 3.5 28 234 -26 8 10 45 8 20 51 8 7 40 8 23 57 -0.30 - 8 0 0 8 45 42 20 1 5.3 27 235 -27 8 40 38 8 50 45 8 37 33 8 53 51 -0.30 - 7 0 0 9 15 47 20 1 7.0 26 235 -28 9 10 43 9 20 51 9 7 37 9 23 57 -0.30 - 6 0 0 9 46 3 20 1 8.6 24 235 -29 9 40 59 9 51 8 9 37 53 9 54 14 -0.30 - 5 0 0 10 16 30 20 1 10.2 23 235 -30 10 11 25 10 21 35 10 8 19 10 24 41 -0.30 - 4 0 0 10 47 5 20 1 11.7 22 236 -31 10 42 0 10 52 11 10 38 54 10 55 17 -0.30 - 3 0 0 11 17 50 20 1 13.1 21 236 -32 11 12 44 11 22 55 11 9 37 11 26 2 -0.30 - 2 0 0 11 48 41 20 1 14.4 20 236 -33 11 43 35 11 53 47 11 40 28 11 56 54 -0.30 - 1 0 0 12 19 40 20 1 15.7 19 236 -34 12 14 33 12 24 46 12 11 26 12 27 53 -0.30 0 0 0 12 50 44 20 1 16.9 18 237 -35 12 45 37 12 55 51 12 42 30 12 58 58 -0.30 1 0 0 13 21 53 20 1 18.0 17 237 -36 13 16 46 13 27 0 13 13 38 13 30 8 -0.30 2 0 0 13 53 6 20 1 19.1 16 237 -37 13 47 58 13 58 13 13 44 51 14 1 21 -0.30 3 0 0 14 24 22 20 1 20.1 14 237 -38 14 19 14 14 29 29 14 16 6 14 32 37 -0.30 4 0 0 14 55 39 20 1 21.0 13 238 -39 14 50 32 15 0 47 14 47 24 15 3 55 -0.30 5 0 0 15 26 59 20 1 21.8 12 238 -40 15 21 51 15 32 7 15 18 43 15 35 15 -0.30 6 0 0 15 58 18 20 1 22.6 11 238 -41 15 53 10 16 3 26 15 50 2 16 6 34 -0.30 7 0 0 16 29 36 20 1 23.3 10 239 -42 16 24 28 16 34 45 16 21 20 16 37 53 -0.30 8 0 0 17 0 53 20 1 23.9 9 239 -43 16 55 45 17 6 2 16 52 37 17 9 10 -0.30 9 0 0 17 32 8 20 1 24.5 8 239 -44 17 27 0 17 37 16 17 23 51 17 40 25 -0.30 10 0 0 18 3 19 20 1 25.0 7 239 -45 17 58 11 18 8 27 17 55 2 18 11 36 -0.30 11 0 0 18 34 26 20 1 25.4 6 240 -46 18 29 17 18 39 34 18 26 9 18 42 43 -0.30 12 0 0 19 5 27 20 1 25.7 5 240 -47 19 0 19 19 10 36 18 57 11 19 13 44 -0.30 13 0 0 19 36 23 20 1 26.0 4 240 -48 19 31 14 19 41 31 19 28 6 19 44 40 -0.30 14 0 0 20 7 11 20 1 26.2 3 241 -48 20 2 3 20 12 20 19 58 55 20 15 28 -0.30 15 0 0 20 37 52 20 1 26.3 1 241 -49 20 32 44 20 43 1 20 29 36 20 46 9 -0.29 16 0 0 21 8 24 20 1 26.4 0 241 -50 21 3 16 21 13 33 21 0 8 21 16 41 -0.28 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6835-00565-1 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 40 52.8972 DE: -26 17 43.020 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 40 52.8971 DE: -26 17 43.020 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.0 * B mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (13859) Fredtreasure asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.007 distance from Earth [AU]: 3.05650 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 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): 0.014", 0.002", 80.374° remarks: * orbital elements for (13859)Fredtreasure : Mean anomaly = 68.8766511503 deg Arg. of pericenter = 252.6518804470 deg Long. of node = 298.6416987241 deg Inclination = 13.2147731080 deg Eccentricity = 0.2082608851 Semimajor axis = 2.7974008019 AU Perihelion dist = 2.2148116348 AU Mag: H = 12.41, G = 0.15 Epoch of elements : MJD 60601.83223284 TDT (2024 Oct 18.8322) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#492023Apr25,0.47,2024,10,18,19.973591,-0.034947,0.290520,18.840633,2.238446,0.004970,-0.000300,-0.000001,0.000000 -61.7976,-26.3091,-123.35,-10.02,False TYC 6835-00565-1,17.68136038,-26.2952833,12.42,11.97,11.73,0.0,0,,17.70678918,-26.3090671,5.99,5.78,0,0,0 13859,Fredtreasure,17.95,15.959,3.0565,0,0,4.032,6.45,,1.4,0 0,68.7013,2024,10,18,252.6519,298.6417,13.2148,0.20826,2.79740,2.21481,12.41,5.0,0.15 1.305,0.0137,0.0021,80,0.0022,Known errors,1.00,0,-1,-1 20241018_0565-1,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org