IOTA/IOTA-ES occultation update for (1473) Ounas / UCAC4 398-071178 event on 2024 Oct 01, 17:36 UT Visible from Summary ------- On 2024 Oct 01 UT, the 17.8747667642882 km diameter asteroid (1473) Ounas will occult a 11.7 mag star in the constellation Serpens for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.69 mag to 16.37 mag (the magnitude of the asteroid) for at most 0.680 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: 94 * date and approx. time of event: 2024 Oct 01, 17:33 - 2024 Oct 01, 17:40 * geocentric midpoint of event [JD]: 2460585.23388929 * magnitude of target star: 11.69 * magnitude drop [mag]: 4.69 * estimated maximum duration [s]: 0.680 * Moon: 1 % sunlit, 86° distance * Sun: 74° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 20 * 1 sigma uncertainty interval [path widths]: +/- 0.46 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 80°) * approx speed of asteroid's shadow [km/s]: 26.4314 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 398-071178 by 1473 Ounas on 2024 Oct 1 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 -104 0 0 -13 43 38 17 33 5.6 0 101 69 -13 49 2 -13 38 13 -13 54 3 -13 33 13 .... -103 0 0 -13 54 56 17 33 5.6 1 100 70 -14 0 21 -13 49 32 -14 5 22 -13 44 31 0.31 -102 0 0 -14 6 26 17 33 5.8 2 100 71 -14 11 51 -14 1 1 -14 16 52 -13 56 0 0.36 -101 0 0 -14 18 6 17 33 6.0 3 100 72 -14 23 31 -14 12 41 -14 28 33 -14 7 40 0.38 -100 0 0 -14 29 57 17 33 6.3 4 100 72 -14 35 22 -14 24 32 -14 40 24 -14 19 30 0.39 - 99 0 0 -14 41 58 17 33 6.7 5 100 73 -14 47 23 -14 36 32 -14 52 25 -14 31 31 0.40 - 98 0 0 -14 54 8 17 33 7.1 6 99 74 -14 59 34 -14 48 43 -15 4 36 -14 43 41 0.40 - 97 0 0 -15 6 29 17 33 7.6 7 99 74 -15 11 55 -15 1 3 -15 16 57 -14 56 1 0.41 - 96 0 0 -15 18 59 17 33 8.2 8 99 75 -15 24 25 -15 13 33 -15 29 27 -15 8 31 0.41 - 95 0 0 -15 31 38 17 33 8.9 9 98 75 -15 37 4 -15 26 12 -15 42 7 -15 21 10 0.41 - 94 0 0 -15 44 26 17 33 9.7 10 98 76 -15 49 53 -15 39 0 -15 54 55 -15 33 57 0.41 - 93 0 0 -15 57 23 17 33 10.5 11 98 76 -16 2 49 -15 51 56 -16 7 52 -15 46 54 0.41 - 92 0 0 -16 10 28 17 33 11.4 12 98 76 -16 15 55 -16 5 1 -16 20 58 -15 59 59 0.41 - 91 0 0 -16 23 41 17 33 12.4 13 97 76 -16 29 8 -16 18 14 -16 34 12 -16 13 12 0.41 - 90 0 0 -16 37 2 17 33 13.4 14 97 76 -16 42 30 -16 31 35 -16 47 33 -16 26 32 0.42 - 89 0 0 -16 50 31 17 33 14.6 15 97 76 -16 55 59 -16 45 4 -17 1 2 -16 40 1 0.42 - 88 0 0 -17 4 7 17 33 15.8 16 96 76 -17 9 35 -16 58 40 -17 14 39 -16 53 37 0.42 - 87 0 0 -17 17 50 17 33 17.1 17 96 76 -17 23 18 -17 12 23 -17 28 22 -17 7 19 0.42 - 86 0 0 -17 31 40 17 33 18.4 18 96 76 -17 37 8 -17 26 12 -17 42 12 -17 21 9 0.42 - 85 0 0 -17 45 36 17 33 19.8 19 95 76 -17 51 4 -17 40 8 -17 56 9 -17 35 5 0.42 - 84 0 0 -17 59 39 17 33 21.3 20 95 75 -18 5 7 -17 54 11 -18 10 11 -17 49 7 0.42 - 83 0 0 -18 13 47 17 33 22.9 21 95 75 -18 19 15 -18 8 19 -18 24 20 -18 3 15 0.42 - 82 0 0 -18 28 0 17 33 24.6 22 94 75 -18 33 29 -18 22 32 -18 38 34 -18 17 28 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0 0 -34 8 43 17 40 21.0 15 268 -44 -34 14 5 -34 3 21 -34 19 4 -33 58 23 0.44 66 0 0 -34 0 38 17 40 22.0 14 267 -45 -34 6 0 -33 55 15 -34 10 59 -33 50 17 0.44 67 0 0 -33 52 21 17 40 22.9 14 266 -46 -33 57 43 -33 46 58 -34 2 42 -33 42 0 0.44 68 0 0 -33 43 52 17 40 23.8 13 266 -46 -33 49 15 -33 38 29 -33 54 14 -33 33 31 0.44 69 0 0 -33 35 12 17 40 24.7 12 265 -47 -33 40 35 -33 29 49 -33 45 34 -33 24 50 0.44 70 0 0 -33 26 20 17 40 25.4 11 265 -48 -33 31 44 -33 20 57 -33 36 43 -33 15 58 0.44 71 0 0 -33 17 17 17 40 26.2 10 264 -48 -33 22 41 -33 11 54 -33 27 41 -33 6 55 0.45 72 0 0 -33 8 3 17 40 26.8 9 264 -49 -33 13 27 -33 2 40 -33 18 27 -32 57 41 0.45 73 0 0 -32 58 38 17 40 27.4 9 263 -49 -33 4 2 -32 53 15 -33 9 2 -32 48 15 0.45 74 0 0 -32 49 2 17 40 28.0 8 262 -50 -32 54 26 -32 43 38 -32 59 26 -32 38 38 0.46 75 0 0 -32 39 15 17 40 28.5 7 262 -50 -32 44 39 -32 33 51 -32 49 40 -32 28 51 0.46 76 0 0 -32 29 17 17 40 28.9 6 261 -51 -32 34 42 -32 23 53 -32 39 42 -32 18 53 0.47 77 0 0 -32 19 9 17 40 29.3 5 261 -51 -32 24 34 -32 13 44 -32 29 34 -32 8 44 0.47 78 0 0 -32 8 50 17 40 29.7 4 260 -52 -32 14 15 -32 3 25 -32 19 16 -31 58 25 0.48 79 0 0 -31 58 21 17 40 29.9 3 260 -52 -32 3 46 -31 52 56 -32 8 47 -31 47 55 0.50 80 0 0 -31 47 42 17 40 30.1 3 259 -53 -31 53 7 -31 42 16 -31 58 8 -31 37 16 0.53 81 0 0 -31 36 52 17 40 30.3 2 259 -53 -31 42 18 -31 31 27 -31 47 19 -31 26 26 0.58 82 0 0 -31 25 53 17 40 30.4 1 258 -54 -31 31 19 -31 20 27 -31 36 20 -31 15 26 0.76 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 398-071178 * constellation : Serpens * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 28 54.8223 DE: -10 27 27.043 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 28 54.8223 DE: -10 27 27.043 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.7 * B mag [mag]: 12.8 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1473) Ounas asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.011 distance from Earth [AU]: 2.19550 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#47 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): 0.015", 0.002", 79.918° remarks: * orbital elements for (1473)Ounas : Mean anomaly = 324.4267251451 deg Arg. of pericenter = 129.3396872198 deg Long. of node = 216.4555740755 deg Inclination = 13.6455149914 deg Eccentricity = 0.2368058112 Semimajor axis = 2.5750613712 AU Perihelion dist = 1.9652718744 AU Mag: H = 11.80, G = 0.15 Epoch of elements : MJD 60584.73388912 TDT (2024 Oct 01.7339) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#472023Apr24,0.68,2024,10,1,17.613343,-0.060122,-0.381934,14.738378,-2.311843,0.005219,0.000064,0.000000,0.000000 -12.5746,-10.4771,-86.84,-3.58,False UCAC4 398-071178,17.48189513,-10.4575119,12.75,11.69,11.12,0.1,0,,17.50455952,-10.4770854,4.69,4.81,0,0,0 1473,Ounas,16.37,18.034,2.1955,0,0,4.003,-9.26,,1.2,0 0,324.2517,2024,10,1,129.3397,216.4556,13.6455,0.23681,2.57506,1.96527,11.80,5.0,0.15 1.463,0.0147,0.0023,80,0.0052,Known errors,1.00,0,-1,-1 20241001_071178,60140.60 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org