IOTA/IOTA-ES occultation update for (6338) Isaosato / UCAC4 322-089255 event on 2024 Oct 19, 00:36 UT Visible from Summary ------- On 2024 Oct 19 UT, the 23.1321868022143 km diameter asteroid (6338) Isaosato will occult a 11.8 mag star in the constellation Scorpius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.99 mag to 17.77 mag (the magnitude of the asteroid) for at most 0.630 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: 96 * date and approx. time of event: 2024 Oct 19, 00:34 - 2024 Oct 19, 00:38 * geocentric midpoint of event [JD]: 2460602.52525921 * magnitude of target star: 11.78 * magnitude drop [mag]: 5.99 * estimated maximum duration [s]: 0.630 * Moon: 96 % sunlit, 154° distance * Sun: 48° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 30 * 1 sigma uncertainty interval [path widths]: +/- 0.41 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.008) * 1 sigma uncertainty ellipse (major, minor, PA): (0.020", 0.001", 113°) * approx speed of asteroid's shadow [km/s]: 37.2349 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 322-089255 by 6338 Isaosato on 2024 Oct 19 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 115 0 0 -24 3 18 0 34 9.0 1 118 38 -24 12 37 -23 54 1 -24 20 15 -23 46 26 .... 116 0 0 -24 33 39 0 34 9.1 2 118 39 -24 43 0 -24 24 20 -24 50 40 -24 16 43 0.69 117 0 0 -25 4 25 0 34 9.3 3 117 40 -25 13 49 -24 55 3 -25 21 30 -24 47 25 0.74 118 0 0 -25 35 36 0 34 9.5 4 117 41 -25 45 1 -25 26 11 -25 52 45 -25 18 31 0.76 119 0 0 -26 7 9 0 34 9.8 5 116 41 -26 16 37 -25 57 42 -26 24 23 -25 50 0 0.77 120 0 0 -26 39 5 0 34 10.2 6 116 42 -26 48 35 -26 29 36 -26 56 23 -26 21 52 0.78 121 0 0 -27 11 22 0 34 10.7 7 115 43 -27 20 55 -27 1 50 -27 28 44 -26 54 5 0.78 122 0 0 -27 43 59 0 34 11.2 8 115 44 -27 53 35 -27 34 26 -28 1 26 -27 26 38 0.78 123 0 0 -28 16 56 0 34 11.8 9 114 44 -28 26 34 -28 7 20 -28 34 27 -27 59 31 0.79 124 0 0 -28 50 12 0 34 12.5 10 114 45 -28 59 52 -28 40 33 -29 7 47 -28 32 42 0.79 125 0 0 -29 23 44 0 34 13.3 11 113 46 -29 33 26 -29 14 4 -29 41 23 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13.3 26 262 -10 -60 12 23 -59 53 33 -60 20 6 -59 45 53 0.82 - 61 0 0 -59 45 4 0 38 14.2 25 261 -11 -59 54 32 -59 35 37 -60 2 17 -59 27 56 0.82 - 60 0 0 -59 26 44 0 38 15.2 24 260 -11 -59 36 14 -59 17 15 -59 44 1 -59 9 31 0.82 - 59 0 0 -59 7 57 0 38 16.1 24 260 -12 -59 17 29 -58 58 26 -59 25 18 -58 50 40 0.82 - 58 0 0 -58 48 42 0 38 17.1 23 259 -12 -58 58 17 -58 39 9 -59 6 8 -58 31 22 0.83 - 57 0 0 -58 29 1 0 38 18.0 23 258 -13 -58 38 38 -58 19 25 -58 46 31 -58 11 36 0.83 - 56 0 0 -58 8 52 0 38 19.0 22 257 -14 -58 18 31 -57 59 14 -58 26 26 -57 51 22 0.83 - 55 0 0 -57 48 14 0 38 19.9 22 256 -14 -57 57 56 -57 38 34 -58 5 53 -57 30 41 0.83 - 54 0 0 -57 27 9 0 38 20.8 21 255 -15 -57 36 53 -57 17 27 -57 44 52 -57 9 32 0.83 - 53 0 0 -57 5 36 0 38 21.7 20 254 -15 -57 15 22 -56 55 51 -57 23 23 -56 47 55 0.83 - 52 0 0 -56 43 35 0 38 22.5 20 253 -16 -56 53 23 -56 33 48 -57 1 25 -56 25 49 0.83 - 51 0 0 -56 21 5 0 38 23.4 19 252 -17 -56 30 55 -56 11 16 -56 38 59 -56 3 16 0.83 - 50 0 0 -55 58 6 0 38 24.2 18 251 -17 -56 7 59 -55 48 15 -56 16 5 -55 40 14 0.83 - 49 0 0 -55 34 40 0 38 25.1 18 250 -18 -55 44 34 -55 24 47 -55 52 41 -55 16 43 0.83 - 48 0 0 -55 10 44 0 38 25.9 17 249 -19 -55 20 41 -55 0 49 -55 28 50 -54 52 44 0.84 - 47 0 0 -54 46 20 0 38 26.6 16 249 -19 -54 56 19 -54 36 24 -55 4 29 -54 28 17 0.84 - 46 0 0 -54 21 28 0 38 27.4 16 248 -20 -54 31 29 -54 11 30 -54 39 41 -54 3 22 0.84 - 45 0 0 -53 56 8 0 38 28.2 15 247 -21 -54 6 10 -53 46 8 -54 14 24 -53 37 58 0.84 - 44 0 0 -53 30 20 0 38 28.9 14 246 -21 -53 40 23 -53 20 17 -53 48 38 -53 12 7 0.84 - 43 0 0 -53 4 3 0 38 29.6 14 245 -22 -53 14 9 -52 53 59 -53 22 25 -52 45 47 0.85 - 42 0 0 -52 37 19 0 38 30.2 13 244 -23 -52 47 26 -52 27 14 -52 55 43 -52 19 0 0.85 - 41 0 0 -52 10 7 0 38 30.9 12 244 -23 -52 20 16 -52 0 0 -52 28 34 -51 51 46 0.85 - 40 0 0 -51 42 28 0 38 31.5 11 243 -24 -51 52 38 -51 32 20 -52 0 58 -51 24 5 0.86 - 39 0 0 -51 14 23 0 38 32.1 11 242 -25 -51 24 34 -51 4 13 -51 32 55 -50 55 57 0.86 - 38 0 0 -50 45 51 0 38 32.6 10 241 -26 -50 56 3 -50 35 40 -51 4 25 -50 27 23 0.86 - 37 0 0 -50 16 53 0 38 33.1 9 240 -26 -50 27 6 -50 6 41 -50 35 29 -49 58 23 0.87 - 36 0 0 -49 47 29 0 38 33.6 8 240 -27 -49 57 44 -49 37 17 -50 6 7 -49 28 58 0.88 - 35 0 0 -49 17 41 0 38 34.0 7 239 -28 -49 27 57 -49 7 28 -49 36 21 -48 59 8 0.89 - 34 0 0 -48 47 29 0 38 34.4 7 238 -29 -48 57 45 -48 37 15 -49 6 10 -48 28 54 0.90 - 33 0 0 -48 16 53 0 38 34.7 6 237 -29 -48 27 10 -48 6 38 -48 35 35 -47 58 17 0.91 - 32 0 0 -47 45 54 0 38 35.0 5 236 -30 -47 56 11 -47 35 39 -48 4 37 -47 27 17 0.93 - 31 0 0 -47 14 33 0 38 35.3 4 236 -31 -47 24 51 -47 4 17 -47 33 17 -46 55 55 0.96 - 30 0 0 -46 42 51 0 38 35.5 3 235 -31 -46 53 9 -46 32 35 -47 1 35 -46 24 13 1.00 - 29 0 0 -46 10 48 0 38 35.7 2 234 -32 -46 21 6 -46 0 32 -46 29 33 -45 52 9 1.07 - 28 0 0 -45 38 26 0 38 35.8 1 234 -33 -45 48 44 -45 28 9 -45 57 11 -45 19 47 1.24 - 27 0 0 -45 5 45 0 38 35.9 0 233 -34 -45 16 3 -44 55 28 -45 24 30 -44 47 6 2.02 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 322-089255 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 49 42.0801 DE: -25 41 32.459 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 49 42.0801 DE: -25 41 32.459 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.8 * B mag [mag]: 13.0 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6338) Isaosato asteroid class: approx. diameter [km]: 23 approx. diameter ["]: 0.009 distance from Earth [AU]: 3.45820 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#51 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): 0.020", 0.001", 113.139° remarks: * orbital elements for (6338)Isaosato : Mean anomaly = 347.4408593700 deg Arg. of pericenter = 209.7161852538 deg Long. of node = 74.9472211529 deg Inclination = 15.3199848447 deg Eccentricity = 0.0886380260 Semimajor axis = 3.1684394004 AU Perihelion dist = 2.8875951864 AU Mag: H = 11.94, G = 0.15 Epoch of elements : MJD 60602.02525921 TDT (2024 Oct 19.0253) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#512023Apr25,0.63,2024,10,19,0.606221,-0.135561,-0.610316,20.522759,-4.528337,0.004284,-0.000727,-0.000001,0.000000 -144.2782,-25.7358,167.15,-10.09,False UCAC4 322-089255,16.82835564,-25.6923497,13.04,11.78,11.10,0.1,0,,16.85339506,-25.7357724,6.00,6.23,0,0,0 6338,Isaosato,17.77,23.383,3.4582,0,0,3.863,-11.51,,1.8,0 0,347.2617,2024,10,18,209.7162,74.9472,15.3200,0.08864,3.16844,2.88760,11.94,5.0,0.15 1.409,0.0200,0.0009,113,0.0038,Known errors,1.01,0,-1,-1 20241019_089255,60140.64 ------ 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