IOTA/IOTA-ES occultation update for (1473) Ounas / G165218.8-183035 event on 2024 Mar 01, 23:04 UT Visible from Summary ------- On 2024 Mar 01 UT, the 17.986267033408 km diameter asteroid (1473) Ounas will occult a 9.9 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 7.13 mag to 17.01 mag (the magnitude of the asteroid) for at most 1.560 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 Mar 01, 22:58 - 2024 Mar 01, 23:09 * geocentric midpoint of event [JD]: 2460371.46117050 * magnitude of target star: 9.88 * magnitude drop [mag]: 7.13 * estimated maximum duration [s]: 1.560 * Moon: 66 % sunlit, 22° distance * Sun: 88° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 31 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.011", 0.002", 85°) * approx speed of asteroid's shadow [km/s]: 19.8104 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of G165218.8-183035 by 1473 Ounas on 2024 Mar 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 19 0 0 0 10 39 22 58 48.2 0 109 -83 0 1 42 0 19 36 - 0 0 32 0 21 50 0 9 12 0 12 5 .... 20 0 0 - 0 9 26 22 58 48.3 1 109 -83 - 0 18 23 - 0 0 30 - 0 20 36 0 1 44 - 0 10 52 - 0 8 0 -0.03 21 0 0 - 0 29 18 22 58 48.5 3 109 -82 - 0 38 14 - 0 20 22 - 0 40 28 - 0 18 9 - 0 30 44 - 0 27 52 -0.09 22 0 0 - 0 48 57 22 58 48.8 4 109 -81 - 0 57 52 - 0 40 1 - 1 0 6 - 0 37 48 - 0 50 23 - 0 47 31 -0.11 23 0 0 - 1 8 22 22 58 49.2 5 109 -81 - 1 17 17 - 0 59 27 - 1 19 30 - 0 57 14 - 1 9 48 - 1 6 56 -0.13 24 0 0 - 1 27 33 22 58 49.8 6 108 -80 - 1 36 27 - 1 18 38 - 1 38 40 - 1 16 25 - 1 28 59 - 1 26 7 -0.14 25 0 0 - 1 46 29 22 58 50.4 7 108 -79 - 1 55 23 - 1 37 35 - 1 57 35 - 1 35 22 - 1 47 55 - 1 45 3 -0.14 26 0 0 - 2 5 10 22 58 51.2 8 108 -78 - 2 14 3 - 1 56 17 - 2 16 16 - 1 54 5 - 2 6 36 - 2 3 45 -0.15 27 0 0 - 2 23 37 22 58 52.0 9 108 -77 - 2 32 29 - 2 14 44 - 2 34 41 - 2 12 31 - 2 25 2 - 2 22 11 -0.15 28 0 0 - 2 41 47 22 58 53.0 10 108 -76 - 2 50 39 - 2 32 55 - 2 52 51 - 2 30 43 - 2 43 13 - 2 40 22 -0.15 29 0 0 - 2 59 42 22 58 54.1 11 108 -75 - 3 8 33 - 2 50 50 - 3 10 45 - 2 48 38 - 3 1 7 - 2 58 16 -0.15 30 0 0 - 3 17 20 22 58 55.3 12 108 -74 - 3 26 10 - 3 8 29 - 3 28 22 - 3 6 17 - 3 18 45 - 3 15 55 -0.16 31 0 0 - 3 34 41 22 58 56.6 13 108 -73 - 3 43 31 - 3 25 51 - 3 45 43 - 3 23 39 - 3 36 6 - 3 33 16 -0.16 32 0 0 - 3 51 46 22 58 58.0 14 108 -72 - 4 0 35 - 3 42 56 - 4 2 47 - 3 40 45 - 3 53 11 - 3 50 21 -0.16 33 0 0 - 4 8 33 22 58 59.5 15 108 -72 - 4 17 21 - 3 59 44 - 4 19 33 - 3 57 33 - 4 9 58 - 4 7 8 -0.16 34 0 0 - 4 25 3 22 59 1.1 16 108 -71 - 4 33 50 - 4 16 15 - 4 36 2 - 4 14 3 - 4 26 27 - 4 23 38 -0.16 35 0 0 - 4 41 14 22 59 2.8 17 108 -70 - 4 50 2 - 4 32 27 - 4 52 13 - 4 30 16 - 4 42 39 - 4 39 50 -0.16 36 0 0 - 4 57 8 22 59 4.6 18 108 -69 - 5 5 54 - 4 48 21 - 5 8 6 - 4 46 10 - 4 58 33 - 4 55 43 -0.16 37 0 0 - 5 12 43 22 59 6.5 19 108 -68 - 5 21 29 - 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30.7 30 107 -58 - 7 39 26 - 7 22 6 - 7 41 36 - 7 19 57 - 7 32 10 - 7 29 23 -0.17 48 0 0 - 7 42 43 22 59 33.6 31 107 -57 - 7 51 22 - 7 34 4 - 7 53 32 - 7 31 54 - 7 44 7 - 7 41 20 -0.17 49 0 0 - 7 54 19 22 59 36.6 32 107 -56 - 8 2 58 - 7 45 40 - 8 5 7 - 7 43 31 - 7 55 42 - 7 52 56 -0.17 50 0 0 - 8 5 34 22 59 39.7 33 107 -55 - 8 14 12 - 7 56 55 - 8 16 21 - 7 54 46 - 8 6 57 - 8 4 10 -0.17 51 0 0 - 8 16 27 22 59 42.9 34 107 -54 - 8 25 5 - 8 7 49 - 8 27 14 - 8 5 40 - 8 17 50 - 8 15 4 -0.17 52 0 0 - 8 26 59 22 59 46.1 35 107 -53 - 8 35 36 - 8 18 22 - 8 37 45 - 8 16 13 - 8 28 22 - 8 25 36 -0.17 53 0 0 - 8 37 9 22 59 49.5 36 107 -52 - 8 45 46 - 8 28 32 - 8 47 54 - 8 26 24 - 8 38 32 - 8 35 46 -0.17 54 0 0 - 8 46 57 22 59 52.9 37 107 -51 - 8 55 34 - 8 38 21 - 8 57 42 - 8 36 13 - 8 48 20 - 8 45 35 -0.17 55 0 0 - 8 56 24 22 59 56.4 38 107 -50 - 9 5 0 - 8 47 48 - 9 7 8 - 8 45 40 - 8 57 47 - 8 55 1 -0.17 56 0 0 - 9 5 29 23 0 0.0 39 107 -49 - 9 14 4 - 8 56 53 - 9 16 12 - 8 54 45 - 9 6 51 - 9 4 6 -0.17 57 0 0 - 9 14 11 23 0 3.6 40 107 -48 - 9 22 46 - 9 5 36 - 9 24 54 - 9 3 28 - 9 15 34 - 9 12 48 -0.17 58 0 0 - 9 22 31 23 0 7.3 41 107 -47 - 9 31 5 - 9 13 57 - 9 33 13 - 9 11 48 - 9 23 54 - 9 21 8 -0.17 59 0 0 - 9 30 29 23 0 11.1 42 106 -46 - 9 39 3 - 9 21 55 - 9 41 11 - 9 19 47 - 9 31 51 - 9 29 6 -0.17 60 0 0 - 9 38 4 23 0 15.0 43 106 -45 - 9 46 38 - 9 29 31 - 9 48 46 - 9 27 23 - 9 39 27 - 9 36 42 -0.17 61 0 0 - 9 45 17 23 0 18.9 44 106 -44 - 9 53 50 - 9 36 44 - 9 55 58 - 9 34 36 - 9 46 40 - 9 43 55 -0.17 62 0 0 - 9 52 7 23 0 22.9 45 106 -43 -10 0 40 - 9 43 34 -10 2 48 - 9 41 27 - 9 53 30 - 9 50 45 -0.17 63 0 0 - 9 58 35 23 0 27.0 46 106 -42 -10 7 7 - 9 50 2 -10 9 15 - 9 47 54 - 9 59 57 - 9 57 12 -0.18 64 0 0 -10 4 39 23 0 31.1 47 106 -41 -10 13 12 - 9 56 7 -10 15 19 - 9 54 0 - 10 6 2 - 10 3 17 -0.18 65 0 0 -10 10 21 23 0 35.3 48 106 -40 -10 18 53 -10 1 49 -10 21 1 - 9 59 42 - 10 11 44 - 10 8 59 -0.18 66 0 0 -10 15 40 23 0 39.6 49 107 -39 -10 24 12 -10 7 9 -10 26 19 -10 5 1 - 10 17 3 - 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62 15 13 33 15 31 43 15 11 17 15 33 59 15 21 10 15 24 6 -0.17 180 0 0 15 44 47 23 9 17.5 9 248 62 15 35 42 15 53 52 15 33 27 15 56 7 15 43 19 15 46 14 -0.17 -179 0 0 16 6 47 23 9 18.4 8 248 63 15 57 42 16 15 51 15 55 27 16 18 7 16 5 19 16 8 14 -0.17 -178 0 0 16 28 37 23 9 19.2 7 248 63 16 19 33 16 37 41 16 17 18 16 39 56 16 27 9 16 30 4 -0.17 -177 0 0 16 50 17 23 9 19.9 6 248 63 16 41 14 16 59 21 16 38 59 17 1 36 16 48 50 16 51 45 -0.16 -176 0 0 17 11 47 23 9 20.5 5 249 63 17 2 45 17 20 51 17 0 29 17 23 6 17 10 20 17 13 15 -0.16 -175 0 0 17 33 7 23 9 21.0 4 249 63 17 24 4 17 42 10 17 21 49 17 44 25 17 31 40 17 34 34 -0.16 -174 0 0 17 54 15 23 9 21.4 3 249 63 17 45 13 18 3 17 17 42 58 18 5 33 17 52 48 17 55 42 -0.16 -173 0 0 18 15 12 23 9 21.6 2 250 63 18 6 10 18 24 14 18 3 55 18 26 29 18 13 45 18 16 39 -0.15 -172 0 0 18 35 57 23 9 21.8 1 250 63 18 26 56 18 44 58 18 24 41 18 47 13 18 34 30 18 37 24 -0.14 -171 0 0 18 56 29 23 9 21.9 0 250 63 18 47 29 19 5 30 18 45 14 19 7 45 18 55 2 18 57 56 -0.03 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 13.9 Data for the target star ------------------------ * name: G165218.8-183035 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 52 18.7613 DE: -18 30 34.556 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 52 18.7613 DE: -18 30 34.556 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.600,0.400) * V mag [mag]: 9.9 * B mag [mag]: 13.1 * Diameter [mas]: 7.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1473) Ounas asteroid class: approx. diameter [km]: 18 approx. diameter ["]: 0.010 distance from Earth [AU]: 2.53240 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): 0.011", 0.002", 84.7° remarks: * orbital elements for (1473)Ounas : Mean anomaly = 273.4735196708 deg Arg. of pericenter = 129.3170060162 deg Long. of node = 216.4574429274 deg Inclination = 13.6459055915 deg Eccentricity = 0.2369093566 Semimajor axis = 2.5754204029 AU Perihelion dist = 1.9652792123 AU Mag: H = 11.80, G = 0.15 Epoch of elements : MJD 60370.96117046 TDT (2024 Mar 01.9612) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#472023Apr24,1.56,2024,3,1,23.068092,-0.029884,0.173749,11.017455,1.908458,-0.005767,0.000681,0.000000,0.000000 107.1699,-18.5510,-162.99,-7.11,False G165218.8-183035,16.87187811,-18.5095988,13.08,9.88,8.15,7.0,4,K,16.89526841,-18.5510050,7.13,8.41,0,0,0 1473,Ounas,17.01,30.843,2.5324,0,0,2.691,6.63,,1.2,0 0,273.2443,2024,3,1,129.3170,216.4574,13.6459,0.23691,2.57542,1.96528,11.80,5.0,0.15 1.125,0.0113,0.0019,85,0.0021,Known errors,0.99,0,-1,-1 20240301_183035,60138.90 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 13, 21:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org