IOTA/IOTA-ES occultation update for (6955) Ekaterina / UCAC4 334-086680 event on 2024 Oct 22, 09:59 UT Visible from Summary ------- On 2024 Oct 22 UT, the 16.0928679444889 km diameter asteroid (6955) Ekaterina will occult a 11.9 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 6.65 mag to 18.50 mag (the magnitude of the asteroid) for at most 0.440 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: 97 * date and approx. time of event: 2024 Oct 22, 09:56 - 2024 Oct 22, 10:01 * geocentric midpoint of event [JD]: 2460605.91609216 * magnitude of target star: 11.85 * magnitude drop [mag]: 6.65 * estimated maximum duration [s]: 0.440 * Moon: 70 % sunlit, 160° distance * Sun: 46° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 17 * 1 sigma uncertainty interval [path widths]: +/- 0.40 * 1 sigma uncertainty interval [seconds]: +/- 1.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.002", 98°) * approx speed of asteroid's shadow [km/s]: 37.2209 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 334-086680 by 6955 Ekaterina on 2024 Oct 22 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 - 5 0 0 22 24 9 9 56 28.3 1 116 44 22 18 59 22 29 20 22 14 54 22 33 24 .... - 4 0 0 21 57 32 9 56 28.3 2 116 45 21 52 21 22 2 42 21 48 17 22 6 48 -0.12 - 3 0 0 21 30 48 9 56 28.4 3 116 46 21 25 37 21 35 58 21 21 32 21 40 3 -0.21 - 2 0 0 21 3 57 9 56 28.6 4 117 47 20 58 46 21 9 7 20 54 41 21 13 13 -0.24 - 1 0 0 20 37 0 9 56 28.8 5 117 48 20 31 49 20 42 11 20 27 44 20 46 16 -0.26 0 0 0 20 9 58 9 56 29.1 6 117 49 20 4 47 20 15 9 20 0 43 20 19 14 -0.27 1 0 0 19 42 52 9 56 29.5 7 118 50 19 37 41 19 48 2 19 33 36 19 52 7 -0.28 2 0 0 19 15 41 9 56 29.9 8 118 51 19 10 31 19 20 52 19 6 26 19 24 57 -0.29 3 0 0 18 48 28 9 56 30.4 9 118 52 18 43 18 18 53 39 18 39 13 18 57 44 -0.30 4 0 0 18 21 12 9 56 30.9 10 119 53 18 16 2 18 26 23 18 11 57 18 30 28 -0.30 5 0 0 17 53 55 9 56 31.5 11 119 54 17 48 45 17 59 6 17 44 40 18 3 11 -0.30 6 0 0 17 26 37 9 56 32.2 12 119 55 17 21 27 17 31 47 17 17 22 17 35 52 -0.31 7 0 0 16 59 18 9 56 32.9 13 120 56 16 54 8 17 4 29 16 50 4 17 8 34 -0.31 8 0 0 16 32 1 9 56 33.7 14 120 57 16 26 51 16 37 11 16 22 46 16 41 15 -0.31 9 0 0 16 4 44 9 56 34.5 15 120 57 15 59 34 16 9 54 15 55 30 16 13 58 -0.31 10 0 0 15 37 30 9 56 35.4 16 121 58 15 32 20 15 42 39 15 28 16 15 46 44 -0.31 11 0 0 15 10 18 9 56 36.4 17 121 59 15 5 8 15 15 27 15 1 5 15 19 31 -0.31 12 0 0 14 43 10 9 56 37.4 18 121 60 14 38 0 14 48 19 14 33 57 14 52 23 -0.32 13 0 0 14 16 6 9 56 38.5 19 122 61 14 10 57 14 21 15 14 6 53 14 25 18 -0.32 14 0 0 13 49 7 9 56 39.7 20 122 62 13 43 58 13 54 15 13 39 55 13 58 19 -0.32 15 0 0 13 22 13 9 56 40.9 22 122 63 13 17 5 13 27 22 13 13 2 13 31 25 -0.32 16 0 0 12 55 26 9 56 42.2 23 122 64 12 50 18 13 0 34 12 46 16 13 4 38 -0.32 17 0 0 12 28 47 9 56 43.5 24 123 64 12 23 39 12 33 54 12 19 36 12 37 57 -0.32 18 0 0 12 2 15 9 56 44.9 25 123 65 11 57 7 12 7 22 11 53 5 12 11 25 -0.32 19 0 0 11 35 52 9 56 46.4 26 123 66 11 30 45 11 40 59 11 26 43 11 45 1 -0.32 20 0 0 11 9 38 9 56 47.9 27 124 67 11 4 31 11 14 44 11 0 29 11 18 46 -0.32 21 0 0 10 43 34 9 56 49.4 28 124 67 10 38 27 10 48 40 10 34 26 10 52 42 -0.32 22 0 0 10 17 40 9 56 51.1 29 124 68 10 12 34 10 22 46 10 8 33 10 26 48 -0.32 23 0 0 9 51 58 9 56 52.7 30 124 69 9 46 53 9 57 4 9 42 52 10 1 5 -0.32 24 0 0 9 26 28 9 56 54.5 31 125 69 9 21 23 9 31 33 9 17 23 9 35 34 -0.32 25 0 0 9 1 11 9 56 56.3 32 125 70 8 56 6 9 6 15 8 52 6 9 10 16 -0.32 26 0 0 8 36 7 9 56 58.1 33 125 70 8 31 3 8 41 11 8 27 3 8 45 11 -0.33 27 0 0 8 11 16 9 57 0.0 34 126 71 8 6 13 8 16 20 8 2 13 8 20 20 -0.33 28 0 0 7 46 41 9 57 1.9 35 126 71 7 41 37 7 51 44 7 37 39 7 55 43 -0.33 29 0 0 7 22 20 9 57 3.9 36 126 71 7 17 17 7 27 23 7 13 19 7 31 21 -0.33 30 0 0 6 58 15 9 57 6.0 37 127 72 6 53 13 7 3 17 6 49 14 7 7 16 -0.33 31 0 0 6 34 26 9 57 8.1 38 127 72 6 29 24 6 39 28 6 25 27 6 43 26 -0.33 32 0 0 6 10 54 9 57 10.2 39 127 72 6 5 53 6 15 55 6 1 55 6 19 53 -0.33 33 0 0 5 47 39 9 57 12.4 41 128 72 5 42 38 5 52 40 5 38 42 5 56 37 -0.33 34 0 0 5 24 42 9 57 14.6 42 128 72 5 19 42 5 29 42 5 15 46 5 33 39 -0.33 35 0 0 5 2 4 9 57 16.9 43 128 72 4 57 4 5 7 3 4 53 8 5 11 0 -0.33 36 0 0 4 39 44 9 57 19.2 44 129 72 4 34 45 4 44 43 4 30 49 4 48 39 -0.33 37 0 0 4 17 43 9 57 21.5 45 129 71 4 12 45 4 22 42 4 8 50 4 26 38 -0.33 38 0 0 3 56 3 9 57 23.9 46 130 71 3 51 5 4 1 1 3 47 10 4 4 56 -0.33 39 0 0 3 34 42 9 57 26.3 47 130 71 3 29 45 3 39 40 3 25 50 3 43 34 -0.33 40 0 0 3 13 42 9 57 28.8 48 131 70 3 8 45 3 18 39 3 4 51 3 22 34 -0.33 41 0 0 2 53 3 9 57 31.3 49 131 70 2 48 7 2 58 0 2 44 13 3 1 54 -0.33 42 0 0 2 32 46 9 57 33.9 50 132 69 2 27 50 2 37 42 2 23 57 2 41 35 -0.33 43 0 0 2 12 50 9 57 36.4 51 132 69 2 7 55 2 17 46 2 4 2 2 21 39 -0.33 44 0 0 1 53 16 9 57 39.0 52 133 68 1 48 22 1 58 11 1 44 29 2 2 4 -0.33 45 0 0 1 34 5 9 57 41.7 52 133 68 1 29 11 1 39 0 1 25 19 1 42 52 -0.33 46 0 0 1 15 17 9 57 44.3 53 134 67 1 10 24 1 20 11 1 6 32 1 24 3 -0.33 47 0 0 0 56 52 9 57 47.0 54 135 66 0 51 59 1 1 46 0 48 8 1 5 37 -0.33 48 0 0 0 38 50 9 57 49.7 55 135 66 0 33 58 0 43 43 0 30 7 0 47 34 -0.33 49 0 0 0 21 13 9 57 52.5 56 136 65 0 16 20 0 26 5 0 12 30 0 29 55 -0.33 50 0 0 0 3 59 9 57 55.3 57 137 64 - 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4 54 31 10 0 22.2 58 232 17 - 4 59 13 - 4 49 49 - 5 2 55 - 4 46 7 -0.34 101 0 0 - 4 48 49 10 0 24.9 57 233 16 - 4 53 31 - 4 44 6 - 4 57 13 - 4 40 24 -0.34 102 0 0 - 4 42 39 10 0 27.6 56 233 15 - 4 47 21 - 4 37 56 - 4 51 4 - 4 34 14 -0.34 103 0 0 - 4 36 2 10 0 30.3 56 234 14 - 4 40 44 - 4 31 19 - 4 44 27 - 4 27 36 -0.34 104 0 0 - 4 28 57 10 0 32.9 55 235 13 - 4 33 40 - 4 24 14 - 4 37 23 - 4 20 31 -0.34 105 0 0 - 4 21 26 10 0 35.5 54 235 12 - 4 26 9 - 4 16 42 - 4 29 52 - 4 12 59 -0.34 106 0 0 - 4 13 27 10 0 38.1 53 236 11 - 4 18 10 - 4 8 43 - 4 21 53 - 4 5 0 -0.34 107 0 0 - 4 5 0 10 0 40.6 52 236 10 - 4 9 44 - 4 0 17 - 4 13 28 - 3 56 33 -0.34 108 0 0 - 3 56 7 10 0 43.1 51 237 9 - 4 0 51 - 3 51 23 - 4 4 35 - 3 47 39 -0.34 109 0 0 - 3 46 47 10 0 45.6 50 237 8 - 3 51 32 - 3 42 3 - 3 55 16 - 3 38 19 -0.34 110 0 0 - 3 37 0 10 0 48.1 49 238 6 - 3 41 45 - 3 32 16 - 3 45 29 - 3 28 31 -0.34 111 0 0 - 3 26 47 10 0 50.5 48 238 5 - 3 31 32 - 3 22 2 - 3 35 16 - 3 18 17 -0.34 112 0 0 - 3 16 6 10 0 52.9 47 238 4 - 3 20 52 - 3 11 21 - 3 24 36 - 3 7 36 -0.34 113 0 0 - 3 4 59 10 0 55.3 46 239 3 - 3 9 45 - 3 0 14 - 3 13 30 - 2 56 28 -0.34 114 0 0 - 2 53 26 10 0 57.6 45 239 2 - 2 58 12 - 2 48 40 - 3 1 57 - 2 44 54 -0.34 115 0 0 - 2 41 26 10 0 59.9 44 239 1 - 2 46 13 - 2 36 40 - 2 49 58 - 2 32 54 -0.34 116 0 0 - 2 29 1 10 1 2.1 43 240 0 - 2 33 47 - 2 24 14 - 2 37 33 - 2 20 27 -0.34 117 0 0 - 2 16 9 10 1 4.4 43 240 -1 - 2 20 56 - 2 11 21 - 2 24 42 - 2 7 35 -0.34 118 0 0 - 2 2 51 10 1 6.5 42 240 -2 - 2 7 38 - 1 58 3 - 2 11 25 - 1 54 16 -0.34 119 0 0 - 1 49 7 10 1 8.7 41 240 -3 - 1 53 55 - 1 44 19 - 1 57 42 - 1 40 32 -0.34 120 0 0 - 1 34 58 10 1 10.8 40 241 -4 - 1 39 47 - 1 30 10 - 1 43 34 - 1 26 22 -0.34 121 0 0 - 1 20 24 10 1 12.8 39 241 -5 - 1 25 13 - 1 15 35 - 1 29 1 - 1 11 47 -0.34 122 0 0 - 1 5 24 10 1 14.9 38 241 -6 - 1 10 14 - 1 0 35 - 1 14 2 - 0 56 47 -0.34 123 0 0 - 0 50 0 10 1 16.8 37 241 -7 - 0 54 50 - 0 45 10 - 0 58 38 - 0 41 21 -0.34 124 0 0 - 0 34 10 10 1 18.8 36 241 -8 - 0 39 1 - 0 29 20 - 0 42 50 - 0 25 31 -0.34 125 0 0 - 0 17 57 10 1 20.7 35 241 -9 - 0 22 47 - 0 13 6 - 0 26 37 - 0 9 16 -0.34 126 0 0 - 0 1 18 10 1 22.5 33 242 -10 - 0 6 10 0 3 33 - 0 9 59 0 7 23 -0.34 127 0 0 0 15 44 10 1 24.3 32 242 -11 0 10 52 0 20 36 0 7 2 0 24 26 -0.34 128 0 0 0 33 10 10 1 26.1 31 242 -12 0 28 17 0 38 2 0 24 27 0 41 53 -0.34 129 0 0 0 50 59 10 1 27.8 30 242 -13 0 46 6 0 55 52 0 42 16 0 59 43 -0.34 130 0 0 1 9 12 10 1 29.4 29 242 -14 1 4 19 1 14 5 1 0 27 1 17 57 -0.34 131 0 0 1 27 48 10 1 31.0 28 242 -15 1 22 54 1 32 42 1 19 2 1 36 34 -0.34 132 0 0 1 46 46 10 1 32.6 27 242 -16 1 41 52 1 51 41 1 38 0 1 55 33 -0.34 133 0 0 2 6 7 10 1 34.1 26 243 -17 2 1 12 2 11 2 1 57 19 2 14 55 -0.34 134 0 0 2 25 49 10 1 35.5 25 243 -18 2 20 54 2 30 45 2 17 1 2 34 38 -0.34 135 0 0 2 45 54 10 1 36.9 24 243 -19 2 40 58 2 50 50 2 37 4 2 54 43 -0.34 136 0 0 3 6 19 10 1 38.3 23 243 -21 3 1 23 3 11 16 2 57 29 3 15 10 -0.34 137 0 0 3 27 5 10 1 39.5 22 243 -22 3 22 8 3 32 3 3 18 14 3 35 57 -0.34 138 0 0 3 48 12 10 1 40.8 21 243 -23 3 43 15 3 53 10 3 39 20 3 57 5 -0.34 139 0 0 4 9 39 10 1 42.0 20 243 -24 4 4 41 4 14 37 4 0 46 4 18 32 -0.34 140 0 0 4 31 25 10 1 43.1 19 243 -25 4 26 27 4 36 24 4 22 32 4 40 20 -0.34 141 0 0 4 53 31 10 1 44.1 18 244 -26 4 48 32 4 58 30 4 44 36 5 2 26 -0.34 142 0 0 5 15 55 10 1 45.1 17 244 -27 5 10 56 5 20 55 5 7 0 5 24 52 -0.34 143 0 0 5 38 38 10 1 46.1 16 244 -28 5 33 38 5 43 38 5 29 41 5 47 35 -0.34 144 0 0 6 1 38 10 1 47.0 15 244 -29 5 56 37 6 6 39 5 52 41 6 10 36 -0.34 145 0 0 6 24 56 10 1 47.8 14 244 -30 6 19 54 6 29 57 6 15 57 6 33 55 -0.34 146 0 0 6 48 30 10 1 48.6 13 244 -31 6 43 28 6 53 32 6 39 30 6 57 30 -0.34 147 0 0 7 12 20 10 1 49.3 11 244 -32 7 7 18 7 17 22 7 3 20 7 21 21 -0.34 148 0 0 7 36 26 10 1 49.9 10 244 -33 7 31 24 7 41 29 7 27 25 7 45 28 -0.34 149 0 0 8 0 47 10 1 50.5 9 245 -34 7 55 44 8 5 51 7 51 45 8 9 50 -0.34 150 0 0 8 25 23 10 1 51.0 8 245 -35 8 20 19 8 30 27 8 16 20 8 34 26 -0.34 151 0 0 8 50 13 10 1 51.4 7 245 -36 8 45 9 8 55 17 8 41 9 8 59 17 -0.34 152 0 0 9 15 15 10 1 51.8 6 245 -37 9 10 11 9 20 20 9 6 11 9 24 20 -0.34 153 0 0 9 40 31 10 1 52.2 5 245 -38 9 35 26 9 45 36 9 31 26 9 49 36 -0.34 154 0 0 10 5 58 10 1 52.4 4 245 -39 10 0 53 10 11 4 9 56 53 10 15 5 -0.34 155 0 0 10 31 37 10 1 52.6 3 246 -40 10 26 32 10 36 43 10 22 31 10 40 45 -0.34 156 0 0 10 57 27 10 1 52.8 2 246 -41 10 52 21 11 2 33 10 48 20 11 6 35 -0.35 157 0 0 11 23 27 10 1 52.8 1 246 -42 11 18 21 11 28 34 11 14 19 11 32 36 -0.37 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.7 Data for the target star ------------------------ * name: UCAC4 334-086680 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 56 57.5348 DE: -23 19 05.851 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 56 57.5348 DE: -23 19 05.851 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.9 * B mag [mag]: 13.2 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (6955) Ekaterina asteroid class: approx. diameter [km]: 16 approx. diameter ["]: 0.006 distance from Earth [AU]: 3.57290 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.016", 0.002", 97.53° remarks: * orbital elements for (6955)Ekaterina : Mean anomaly = 295.2693361602 deg Arg. of pericenter = 320.9254958145 deg Long. of node = 31.5596407858 deg Inclination = 0.9431261399 deg Eccentricity = 0.1629422856 Semimajor axis = 3.1180384447 AU Perihelion dist = 2.6099781341 AU Mag: H = 12.57, G = 0.15 Epoch of elements : MJD 60605.41609200 TDT (2024 Oct 22.4161) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr25,0.44,2024,10,22,9.986212,0.032356,0.318171,20.894416,-2.186808,0.004225,-0.000499,-0.000001,0.000000 73.4883,-23.3574,26.31,-11.29,False UCAC4 334-086680,16.94931527,-23.3182919,13.24,11.85,11.10,0.1,0,,16.97396872,-23.3573875,6.65,6.95,0,0,0 6955,Ekaterina,18.50,16.352,3.5729,0,0,3.735,-5.38,,1.6,0 0,295.1949,2024,10,22,320.9255,31.5596,0.9431,0.16294,3.11804,2.60998,12.57,5.0,0.15 1.394,0.0160,0.0025,98,0.0025,Known errors,1.18,0,-1,-1 20241022_086680,60140.65 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 15:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org