IOTA/IOTA-ES occultation update for (73) Klytia / UCAC4 317-207260 event on 2024 Jul 13, 19:40 UT Visible from Summary ------- On 2024 Jul 13 UT, the 45.2744184621782 km diameter asteroid (73) Klytia will occult a 11.6 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.56 mag to 12.83 mag (the magnitude of the asteroid) for at most 4.090 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 Jul 13, 19:31 - 2024 Jul 13, 19:49 * geocentric midpoint of event [JD]: 2460505.31988275 * magnitude of target star: 11.57 * magnitude drop [mag]: 1.56 * estimated maximum duration [s]: 4.090 * Moon: 48 % sunlit, 80° distance * Sun: 168° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 50 * 1 sigma uncertainty interval [path widths]: +/- 0.07 * 1 sigma uncertainty interval [seconds]: +/- 1.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.003", 85°) * approx speed of asteroid's shadow [km/s]: 11.0939 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 317-207260 by 73 Klytia on 2024 Jul 13 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 - 50 0 0 -24 18 39 19 49 21.9 1 119 11 -24 3 16 -24 34 3 -24 1 0 -24 36 21 .... - 49 0 0 -24 49 43 19 49 21.6 2 119 10 -24 34 20 -25 5 8 -24 32 3 -25 7 25 0.41 - 48 0 0 -25 20 42 19 49 21.1 3 118 9 -25 5 19 -25 36 7 -25 3 2 -25 38 24 0.41 - 47 0 0 -25 51 34 19 49 20.4 4 118 8 -25 36 11 -26 6 59 -25 33 54 -26 9 17 0.42 - 46 0 0 -26 22 19 19 49 19.5 5 117 7 -26 6 56 -26 37 45 -26 4 39 -26 40 2 0.42 - 45 0 0 -26 52 57 19 49 18.4 6 117 6 -26 37 34 -27 8 22 -26 35 17 -27 10 39 0.42 - 44 0 0 -27 23 25 19 49 17.1 7 116 5 -27 8 2 -27 38 50 -27 5 45 -27 41 8 0.42 - 43 0 0 -27 53 44 19 49 15.6 8 116 4 -27 38 21 -28 9 8 -27 36 4 -28 11 26 0.43 - 42 0 0 -28 23 52 19 49 13.9 9 116 3 -28 8 29 -28 39 16 -28 6 13 -28 41 34 0.43 - 41 0 0 -28 53 49 19 49 12.1 10 115 2 -28 38 27 -29 9 13 -28 36 10 -29 11 31 0.43 - 40 0 0 -29 23 34 19 49 10.1 11 115 1 -29 8 12 -29 38 58 -29 5 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-26 31 55 -25 58 53 -26 34 12 0.46 144 0 0 -25 45 58 19 32 10.4 13 246 -22 -25 30 37 -26 1 22 -25 28 20 -26 3 39 0.46 145 0 0 -25 15 19 19 32 7.9 12 246 -21 -24 59 57 -25 30 42 -24 57 41 -25 33 0 0.46 146 0 0 -24 44 33 19 32 5.6 11 246 -20 -24 29 12 -24 59 56 -24 26 56 -25 2 14 0.47 147 0 0 -24 13 43 19 32 3.5 10 245 -19 -23 58 22 -24 29 5 -23 56 5 -24 31 23 0.47 148 0 0 -23 42 48 19 32 1.6 9 245 -18 -23 27 27 -23 58 10 -23 25 11 -24 0 27 0.47 149 0 0 -23 11 49 19 31 59.9 8 244 -17 -22 56 29 -23 27 11 -22 54 13 -23 29 28 0.48 150 0 0 -22 40 48 19 31 58.3 7 244 -16 -22 25 29 -22 56 10 -22 23 13 -22 58 27 0.49 151 0 0 -22 9 46 19 31 57.0 6 244 -15 -21 54 27 -22 25 6 -21 52 11 -22 27 23 0.50 152 0 0 -21 38 42 19 31 56.0 5 243 -13 -21 23 25 -21 54 2 -21 21 9 -21 56 19 0.51 153 0 0 -21 7 39 19 31 55.1 4 243 -12 -20 52 22 -21 22 58 -20 50 6 -21 25 15 0.54 154 0 0 -20 36 37 19 31 54.4 3 242 -11 -20 21 21 -20 51 55 -20 19 5 -20 54 12 0.58 155 0 0 -20 5 37 19 31 54.0 2 242 -10 -19 50 22 -20 20 55 -19 48 6 -20 23 11 0.69 156 0 0 -19 34 40 19 31 53.7 1 242 -9 -19 19 26 -19 49 56 -19 17 11 -19 52 13 1.21 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: UCAC4 317-207260 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 44 33.6284 DE: -26 45 23.727 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 44 33.6284 DE: -26 45 23.727 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * B mag [mag]: 12.6 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (73) Klytia asteroid class: approx. diameter [km]: 45 approx. diameter ["]: 0.036 distance from Earth [AU]: 1.74530 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#60 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): 0.016", 0.003", 85.01° remarks: * orbital elements for (73)Klytia : Mean anomaly = 224.3999785049 deg Arg. of pericenter = 56.2411481626 deg Long. of node = 6.8384236270 deg Inclination = 2.3693814735 deg Eccentricity = 0.0422092976 Semimajor axis = 2.6647538100 AU Perihelion dist = 2.5522764234 AU Mag: H = 9.03, G = 0.15 Epoch of elements : MJD 60504.81988304 TDT (2024 Jul 13.8199) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#602023Apr24,4.09,2024,7,13,19.677186,0.018546,-0.409490,-6.255283,-0.283477,0.001111,0.000440,0.000001,0.000000 54.1940,-26.7318,-113.68,21.66,False UCAC4 317-207260,18.74267456,-26.7565909,12.57,11.57,11.03,0.1,0,,18.76850207,-26.7317981,1.55,1.62,0,0,0 73,Klytia,12.83,45.401,1.7453,0,0,-2.352,-1.42,,2.4,0 0,224.2142,2024,7,13,56.2411,6.8384,2.3694,0.04221,2.66475,2.55228,9.03,5.0,0.15 1.074,0.0157,0.0026,85,0.0027,Known errors,0.98,0,-1,-1 20240713_207260,60140.20 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org