IOTA/IOTA-ES occultation update for (138) Tolosa / TYC 4666-00899-1 event on 2024 Oct 08, 08:47 UT Visible from Summary ------- On 2024 Oct 08 UT, the 50.3605885912394 km diameter asteroid (138) Tolosa will occult a 8.5 mag star in the constellation Pisces for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.99 mag to 11.46 mag (the magnitude of the asteroid) for at most 6.960 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 08, 08:35 - 2024 Oct 08, 08:58 * geocentric midpoint of event [JD]: 2460591.86614625 * magnitude of target star: 8.54 * magnitude drop [mag]: 2.99 * estimated maximum duration [s]: 6.960 * Moon: 27 % sunlit, 101° distance * Sun: 163° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 67 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 4.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.033, +/- 0.016) * 1 sigma uncertainty ellipse (major, minor, PA): (0.037", 0.004", 64°) * approx speed of asteroid's shadow [km/s]: 7.2656 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4666-00899-1 by 138 Tolosa on 2024 Oct 8 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 114 0 0 -54 0 19 8 58 15.9 0 97 16 -53 42 10 -54 18 32 -53 36 37 -54 24 9 .... 115 0 0 -54 4 32 8 58 15.7 1 96 15 -53 46 24 -54 22 45 -53 40 51 -54 28 21 0.62 116 0 0 -54 8 33 8 58 15.5 1 95 14 -53 50 26 -54 26 46 -53 44 54 -54 32 22 0.72 117 0 0 -54 12 24 8 58 15.1 2 94 14 -53 54 16 -54 30 36 -53 48 44 -54 36 12 0.76 118 0 0 -54 16 2 8 58 14.6 3 93 13 -53 57 56 -54 34 14 -53 52 24 -54 39 50 0.78 119 0 0 -54 19 30 8 58 14.0 3 93 13 -54 1 23 -54 37 41 -53 55 52 -54 43 16 0.80 120 0 0 -54 22 46 8 58 13.3 4 92 12 -54 4 40 -54 40 57 -53 59 8 -54 46 32 0.81 121 0 0 -54 25 50 8 58 12.4 4 91 12 -54 7 45 -54 44 1 -54 2 13 -54 49 36 0.82 122 0 0 -54 28 43 8 58 11.5 5 90 11 -54 10 38 -54 46 54 -54 5 7 -54 52 29 0.82 123 0 0 -54 31 25 8 58 10.4 6 89 10 -54 13 20 -54 49 35 -54 7 49 -54 55 10 0.83 124 0 0 -54 33 56 8 58 9.2 6 89 10 -54 15 51 -54 52 6 -54 10 20 -54 57 40 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0.90 - 64 0 0 -29 9 6 8 36 29.3 10 271 -16 -28 50 54 -29 27 23 -28 45 21 -29 33 0 0.90 - 63 0 0 -29 1 58 8 36 26.4 9 270 -15 -28 43 47 -29 20 14 -28 38 13 -29 25 51 0.91 - 62 0 0 -28 55 5 8 36 23.9 8 270 -14 -28 36 54 -29 13 20 -28 31 20 -29 18 57 0.91 - 61 0 0 -28 48 26 8 36 21.5 7 269 -13 -28 30 16 -29 6 42 -28 24 43 -29 12 18 0.92 - 60 0 0 -28 42 3 8 36 19.5 6 269 -12 -28 23 53 -29 0 18 -28 18 20 -29 5 54 0.93 - 59 0 0 -28 35 55 8 36 17.7 5 268 -12 -28 17 45 -28 54 9 -28 12 12 -28 59 46 0.94 - 58 0 0 -28 30 2 8 36 16.2 4 268 -11 -28 11 53 -28 48 16 -28 6 20 -28 53 52 0.96 - 57 0 0 -28 24 25 8 36 14.9 4 267 -10 -28 6 16 -28 42 39 -28 0 44 -28 48 15 0.98 - 56 0 0 -28 19 4 8 36 14.0 3 267 -9 -28 0 56 -28 37 17 -27 55 23 -28 42 53 1.02 - 55 0 0 -28 13 59 8 36 13.3 2 266 -8 -27 55 51 -28 32 12 -27 50 19 -28 37 48 1.10 - 54 0 0 -28 9 10 8 36 12.8 1 266 -7 -27 51 2 -28 27 23 -27 45 30 -28 32 59 1.34 - 53 0 0 -28 4 37 8 36 12.7 0 265 -7 .. .. .. -28 22 50 .. .. .. -28 28 26 62.14 Uncertainty in time = +/- 4 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 4666-00899-1 * constellation : Pisces * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 00 03 59.2804 DE: -04 18 37.050 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 00 03 59.2804 DE: -04 18 37.050 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 8.5 * B mag [mag]: 9.1 * Diameter [mas]: 0.20 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (138) Tolosa asteroid class: approx. diameter [km]: 50 approx. diameter ["]: 0.058 distance from Earth [AU]: 1.18860 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#93 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): 0.037", 0.004", 64.069° remarks: * orbital elements for (138)Tolosa : Mean anomaly = 37.7203671420 deg Arg. of pericenter = 260.6934588128 deg Long. of node = 54.7207345589 deg Inclination = 3.2021468464 deg Eccentricity = 0.1616772113 Semimajor axis = 2.4489408266 AU Perihelion dist = 2.0530029031 AU Mag: H = 8.86, G = 0.15 Epoch of elements : MJD 60591.36614537 TDT (2024 Oct 08.3661) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#932023Apr24,6.96,2024,10,8,8.787510,0.147016,-0.638380,-3.996371,-0.919972,0.001247,0.000978,0.000001,0.000001 -147.9737,-4.1706,45.05,-6.13,False TYC 4666-00899-1,0.06646678,-4.3102915,9.10,8.54,8.24,0.2,0,,0.08791280,-4.1706230,2.99,2.85,0,0,0 138,Tolosa,11.46,50.533,1.1886,0,0,-1.975,-6.80,,2.8,0 0,37.6262,2024,10,8,260.6935,54.7207,3.2021,0.16168,2.44894,2.05300,8.86,5.0,0.15 1.153,0.0367,0.0037,64,0.0090,Known errors,1.25,0,-1,-1 20241008_0899-1,60140.62 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org