IOTA/IOTA-ES occultation update for (729) Watsonia / TYC 6413-00035-1 event on 2024 Oct 17, 08:51 UT Visible from Summary ------- On 2024 Oct 17 UT, the 51.173 km diameter asteroid (729) Watsonia will occult a 10.8 mag star in the constellation Cetus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.40 mag to 14.12 mag (the magnitude of the asteroid) for at most 5.060 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: 100 * date and approx. time of event: 2024 Oct 17, 08:42 - 2024 Oct 17, 09:01 * geocentric midpoint of event [JD]: 2460600.86918200 * magnitude of target star: 10.77 * magnitude drop [mag]: 3.40 * estimated maximum duration [s]: 5.060 * Moon: 100 % sunlit, 36° distance * Sun: 144° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 57 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 76°) * approx speed of asteroid's shadow [km/s]: 10.1048 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6413-00035-1 by 729 Watsonia on 2024 Oct 17 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 97 0 0 -36 37 24 9 0 58.3 1 118 33 -36 19 55 -36 54 56 -36 17 50 -36 57 2 .... 98 0 0 -37 3 1 9 0 58.0 2 117 32 -36 45 33 -37 20 31 -36 43 28 -37 22 37 0.46 99 0 0 -37 28 19 9 0 57.6 3 116 31 -37 10 53 -37 45 48 -37 8 48 -37 47 54 0.47 100 0 0 -37 53 19 9 0 57.0 3 116 30 -37 35 54 -38 10 46 -37 33 50 -38 12 51 0.48 101 0 0 -38 17 59 9 0 56.2 4 115 29 -38 0 36 -38 35 25 -37 58 32 -38 37 30 0.48 102 0 0 -38 42 20 9 0 55.3 5 115 28 -38 24 59 -38 59 44 -38 22 55 -39 1 49 0.49 103 0 0 -39 6 21 9 0 54.2 6 114 28 -38 49 2 -39 23 44 -38 46 58 -39 25 48 0.49 104 0 0 -39 30 2 9 0 53.0 7 113 27 -39 12 45 -39 47 23 -39 10 41 -39 49 28 0.49 105 0 0 -39 53 23 9 0 51.6 8 113 26 -39 36 7 -40 10 42 -39 34 4 -40 12 46 0.49 106 0 0 -40 16 23 9 0 50.1 9 112 25 -39 59 9 -40 33 40 -39 57 6 -40 35 44 0.49 107 0 0 -40 39 3 9 0 48.4 9 111 24 -40 21 51 -40 56 18 -40 19 48 -40 58 22 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27.5 26 256 -27 -24 52 33 -25 27 31 -24 50 28 -25 29 37 0.51 - 80 0 0 -24 41 14 8 43 22.2 25 256 -27 -24 23 47 -24 58 44 -24 21 42 -25 0 50 0.51 - 79 0 0 -24 12 28 8 43 17.0 24 255 -26 -23 55 2 -24 29 57 -23 52 57 -24 32 2 0.51 - 78 0 0 -23 43 42 8 43 12.0 23 255 -26 -23 26 17 -24 1 10 -23 24 13 -24 3 16 0.51 - 77 0 0 -23 14 59 8 43 7.2 22 254 -25 -22 57 35 -23 32 25 -22 55 30 -23 34 31 0.51 - 76 0 0 -22 46 17 8 43 2.6 21 254 -24 -22 28 55 -23 3 43 -22 26 50 -23 5 48 0.51 - 75 0 0 -22 17 39 8 42 58.2 20 253 -24 -22 0 18 -22 35 4 -21 58 13 -22 37 9 0.51 - 74 0 0 -21 49 5 8 42 54.0 19 253 -23 -21 31 45 -22 6 28 -21 29 41 -22 8 33 0.51 - 73 0 0 -21 20 36 8 42 50.0 18 252 -22 -21 3 17 -21 37 58 -21 1 13 -21 40 2 0.52 - 72 0 0 -20 52 12 8 42 46.2 17 252 -22 -20 34 55 -21 9 33 -20 32 51 -21 11 37 0.52 - 71 0 0 -20 23 55 8 42 42.6 16 251 -21 -20 6 39 -20 41 14 -20 4 36 -20 43 18 0.52 - 70 0 0 -19 55 45 8 42 39.2 15 251 -20 -19 38 31 -20 13 2 -19 36 27 -20 15 6 0.52 - 69 0 0 -19 27 43 8 42 36.0 14 251 -20 -19 10 30 -19 44 58 -19 8 27 -19 47 2 0.52 - 68 0 0 -18 59 49 8 42 33.1 13 250 -19 -18 42 38 -19 17 3 -18 40 35 -19 19 7 0.52 - 67 0 0 -18 32 6 8 42 30.3 12 250 -18 -18 14 56 -18 49 18 -18 12 54 -18 51 22 0.53 - 66 0 0 -18 4 32 8 42 27.8 11 250 -17 -17 47 25 -18 21 43 -17 45 22 -18 23 46 0.53 - 65 0 0 -17 37 10 8 42 25.6 10 249 -16 -17 20 4 -17 54 19 -17 18 2 -17 56 22 0.54 - 64 0 0 -17 10 0 8 42 23.5 8 249 -16 -16 52 56 -17 27 7 -16 50 54 -17 29 10 0.54 - 63 0 0 -16 43 2 8 42 21.7 7 249 -15 -16 26 0 -17 0 7 -16 23 58 -17 2 10 0.55 - 62 0 0 -16 16 17 8 42 20.1 6 249 -14 -15 59 17 -16 33 20 -15 57 15 -16 35 23 0.56 - 61 0 0 -15 49 47 8 42 18.8 5 248 -13 -15 32 48 -16 6 48 -15 30 47 -16 8 50 0.57 - 60 0 0 -15 23 31 8 42 17.7 4 248 -12 -15 6 34 -15 40 30 -15 4 33 -15 42 32 0.59 - 59 0 0 -14 57 30 8 42 16.8 3 248 -12 -14 40 36 -15 14 28 -14 38 35 -15 16 29 0.62 - 58 0 0 -14 31 46 8 42 16.2 2 247 -11 -14 14 54 -14 48 41 -14 12 53 -14 50 43 0.68 - 57 0 0 -14 6 18 8 42 15.8 1 247 -10 -13 49 28 -14 23 12 -13 47 27 -14 25 13 0.86 - 56 0 0 -13 41 8 8 42 15.7 0 247 -9 .. .. .. -13 57 59 .. .. .. -14 0 0 6.69 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 6413-00035-1 * constellation : Cetus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 00 19 48.4552 DE: -22 31 18.205 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 00 19 48.4552 DE: -22 31 18.206 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.8 * B mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (729) Watsonia asteroid class: Barbarian approx. diameter [km]: 51 approx. diameter ["]: 0.033 distance from Earth [AU]: 2.13100 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#61 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): 0.014", 0.002", 75.816° remarks: * orbital elements for (729)Watsonia : Mean anomaly = 149.4071678185 deg Arg. of pericenter = 87.1677239498 deg Long. of node = 124.3140445674 deg Inclination = 18.0507960077 deg Eccentricity = 0.0965239027 Semimajor axis = 2.7588046525 AU Perihelion dist = 2.4925140606 AU Mag: H = 9.41, G = 0.15 Epoch of elements : MJD 60600.36918171 TDT (2024 Oct 17.3692) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#612023Apr24,5.06,2024,10,17,8.860368,0.098088,-0.445216,-5.569894,-1.226948,0.001714,0.002965,0.000001,0.000000 -153.9889,-22.3832,43.42,-9.49,False TYC 6413-00035-1,0.33012645,-22.5217236,11.24,10.77,10.52,0.0,0,,0.35134473,-22.3831969,3.40,3.21,0,0,0 729,Watsonia,14.12,51.173,2.1310,0,0,-1.657,-5.06,,2.6,0 0,149.3278,2024,10,17,87.1677,124.3140,18.0508,0.09652,2.75880,2.49251,9.40,5.0,0.15 1.060,0.0140,0.0019,76,0.0020,Known errors,1.13,0,-1,-1 20241017_0035-1,60140.64 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org