IOTA/IOTA-ES occultation update for (84) Klio / UCAC4 341-070132 event on 2024 Sep 16, 21:17 UT Visible from Summary ------- On 2024 Sep 16 UT, the 82.274 km diameter asteroid (84) Klio will occult a 11.8 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.84 mag to 14.53 mag (the magnitude of the asteroid) for at most 2.190 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 Sep 16, 21:15 - 2024 Sep 16, 21:20 * geocentric midpoint of event [JD]: 2460570.38740900 * magnitude of target star: 11.77 * magnitude drop [mag]: 2.84 * estimated maximum duration [s]: 2.190 * Moon: 98 % sunlit, 117° distance * Sun: 46° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 88 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 1 sigma uncertainty interval [seconds]: +/- 0.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.011, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.002", 114°) * approx speed of asteroid's shadow [km/s]: 37.5535 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 341-070132 by 84 Klio on 2024 Sep 16 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 -174 0 0 34 21 12 21 15 14.3 0 117 45 33 54 28 .. .. .. 33 51 16 .. .. .. .... -173 0 0 33 55 48 21 15 14.4 1 117 46 33 29 1 34 22 41 33 25 49 34 25 54 -0.03 -172 0 0 33 30 4 21 15 14.4 2 118 47 33 3 14 33 56 59 33 0 1 34 0 12 -0.21 -171 0 0 33 3 59 21 15 14.5 3 118 48 32 37 6 33 30 57 32 33 54 33 34 11 -0.26 -170 0 0 32 37 34 21 15 14.7 4 119 49 32 10 39 33 4 35 32 7 26 33 7 49 -0.29 -169 0 0 32 10 50 21 15 14.9 5 120 50 31 43 53 32 37 54 31 40 40 32 41 8 -0.31 -168 0 0 31 43 48 21 15 15.2 6 120 51 31 16 47 32 10 53 31 13 34 32 14 8 -0.33 -167 0 0 31 16 26 21 15 15.5 7 121 51 30 49 24 31 43 34 30 46 10 31 46 49 -0.33 -166 0 0 30 48 47 21 15 15.9 8 121 52 30 21 43 31 15 57 30 18 29 31 19 13 -0.34 -165 0 0 30 20 51 21 15 16.4 9 122 53 29 53 44 30 48 3 29 50 30 30 51 18 -0.35 -164 0 0 29 52 38 21 15 16.9 10 122 54 29 25 29 30 19 52 29 22 15 30 23 7 -0.35 -163 0 0 29 24 8 21 15 17.4 11 123 55 28 56 58 29 51 24 28 53 43 29 54 40 -0.35 -162 0 0 28 55 23 21 15 18.0 12 123 56 28 28 11 29 22 40 28 24 56 29 25 57 -0.36 -161 0 0 28 26 23 21 15 18.7 13 124 57 27 59 10 28 53 42 27 55 55 28 56 58 -0.36 -160 0 0 27 57 8 21 15 19.4 14 124 58 27 29 54 28 24 29 27 26 39 28 27 45 -0.36 -159 0 0 27 27 40 21 15 20.2 15 125 59 27 0 25 27 55 2 26 57 9 27 58 19 -0.36 -158 0 0 26 58 0 21 15 21.0 16 125 60 26 30 43 27 25 22 26 27 27 27 28 39 -0.36 -157 0 0 26 28 6 21 15 21.9 17 126 61 26 0 49 26 55 30 25 57 33 26 58 47 -0.37 -156 0 0 25 58 2 21 15 22.9 18 126 62 25 30 43 26 25 26 25 27 28 26 28 43 -0.37 -155 0 0 25 27 47 21 15 23.9 19 127 63 25 0 28 25 55 12 24 57 12 25 58 29 -0.37 -154 0 0 24 57 22 21 15 25.0 20 127 64 24 30 2 25 24 47 24 26 47 25 28 4 -0.37 -153 0 0 24 26 48 21 15 26.2 21 128 65 23 59 28 24 54 14 23 56 12 24 57 31 -0.37 -152 0 0 23 56 6 21 15 27.4 22 128 66 23 28 46 24 23 32 23 25 30 24 26 49 -0.37 -151 0 0 23 25 16 21 15 28.6 23 128 66 22 57 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19 22.8 50 242 12 - 5 51 53 - 5 3 57 - 5 54 44 - 5 1 4 -0.39 - 62 0 0 - 5 27 20 21 19 25.2 49 242 11 - 5 51 16 - 5 3 20 - 5 54 8 - 5 0 27 -0.39 - 61 0 0 - 5 26 12 21 19 27.6 48 243 10 - 5 50 8 - 5 2 11 - 5 53 0 - 4 59 19 -0.39 - 60 0 0 - 5 24 33 21 19 29.9 47 243 9 - 5 48 29 - 5 0 32 - 5 51 21 - 4 57 39 -0.39 - 59 0 0 - 5 22 22 21 19 32.3 46 244 8 - 5 46 19 - 4 58 21 - 5 49 11 - 4 55 29 -0.39 - 58 0 0 - 5 19 41 21 19 34.6 45 244 7 - 5 43 38 - 4 55 39 - 5 46 30 - 4 52 47 -0.39 - 57 0 0 - 5 16 28 21 19 36.8 44 244 6 - 5 40 26 - 4 52 26 - 5 43 18 - 4 49 33 -0.39 - 56 0 0 - 5 12 45 21 19 39.0 43 245 5 - 5 36 44 - 4 48 42 - 5 39 35 - 4 45 49 -0.39 - 55 0 0 - 5 8 30 21 19 41.2 42 245 4 - 5 32 30 - 4 44 26 - 5 35 22 - 4 41 34 -0.39 - 54 0 0 - 5 3 45 21 19 43.4 41 245 3 - 5 27 45 - 4 39 40 - 5 30 37 - 4 36 47 -0.39 - 53 0 0 - 4 58 28 21 19 45.5 41 245 1 - 5 22 30 - 4 34 23 - 5 25 22 - 4 31 29 -0.39 - 52 0 0 - 4 52 41 21 19 47.5 40 245 0 - 5 16 44 - 4 28 34 - 5 19 36 - 4 25 41 -0.39 - 51 0 0 - 4 46 23 21 19 49.6 39 246 -1 - 5 10 27 - 4 22 15 - 5 13 19 - 4 19 21 -0.39 - 50 0 0 - 4 39 34 21 19 51.6 38 246 -2 - 5 3 39 - 4 15 24 - 5 6 32 - 4 12 31 -0.39 - 49 0 0 - 4 32 14 21 19 53.5 37 246 -3 - 4 56 21 - 4 8 3 - 4 59 14 - 4 5 9 -0.39 - 48 0 0 - 4 24 23 21 19 55.4 36 246 -4 - 4 48 32 - 4 0 11 - 4 51 25 - 3 57 17 -0.39 - 47 0 0 - 4 16 2 21 19 57.3 35 246 -5 - 4 40 12 - 3 51 48 - 4 43 5 - 3 48 54 -0.39 - 46 0 0 - 4 7 10 21 19 59.1 34 246 -6 - 4 31 22 - 3 42 55 - 4 34 15 - 3 40 0 -0.39 - 45 0 0 - 3 57 48 21 20 0.9 33 246 -6 - 4 22 2 - 3 33 30 - 4 24 55 - 3 30 36 -0.39 - 44 0 0 - 3 47 55 21 20 2.6 32 246 -7 - 4 12 11 - 3 23 36 - 4 15 4 - 3 20 41 -0.39 - 43 0 0 - 3 37 32 21 20 4.3 31 247 -8 - 4 1 49 - 3 13 10 - 4 4 43 - 3 10 15 -0.39 - 42 0 0 - 3 26 38 21 20 5.9 30 247 -9 - 3 50 58 - 3 2 14 - 3 53 52 - 2 59 19 -0.39 - 41 0 0 - 3 15 14 21 20 7.5 29 247 -10 - 3 39 36 - 2 50 48 - 3 42 30 - 2 47 53 -0.39 - 40 0 0 - 3 3 20 21 20 9.1 28 247 -11 - 3 27 44 - 2 38 52 - 3 30 39 - 2 35 56 -0.39 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30.4 1 248 -37 4 28 5 5 19 39 4 25 0 5 22 44 -0.48 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 341-070132 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 19 27.6119 DE: -21 49 12.661 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 19 27.6119 DE: -21 49 12.661 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.8 * B mag [mag]: 12.3 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (84) Klio asteroid class: approx. diameter [km]: 82 approx. diameter ["]: 0.038 distance from Earth [AU]: 2.95920 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#104 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): 0.012", 0.002", 113.812° remarks: * orbital elements for (84)Klio : Mean anomaly = 282.1766267818 deg Arg. of pericenter = 15.0717272687 deg Long. of node = 327.5013866103 deg Inclination = 9.3129659776 deg Eccentricity = 0.2356569269 Semimajor axis = 2.3628767628 AU Perihelion dist = 1.8060484863 AU Mag: H = 9.37, G = 0.15 Epoch of elements : MJD 60569.88740900 TDT (2024 Sep 16.8874) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1042023Apr24,2.19,2024,9,16,21.297816,0.098949,0.351243,20.389564,-5.791980,0.003529,-0.001751,-0.000001,0.000000 -100.5691,-21.9334,-140.83,2.19,False UCAC4 341-070132,14.32433670,-21.8201841,12.32,11.77,11.47,0.0,0,,14.34717932,-21.9333699,2.84,2.70,0,0,0 84,Klio,14.53,82.274,2.9592,0,0,4.355,-17.21,,5.0,0 0,281.9358,2024,9,16,15.0717,327.5014,9.3130,0.23566,2.36288,1.80605,9.37,5.0,0.15 1.060,0.0123,0.0015,114,0.0023,Known errors,1.11,0,-1,-1 20240916_070132,60140.57 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org