IOTA/IOTA-ES occultation update for (195) Eurykleia / TYC 6787-01765-1 event on 2021 Apr 15, 11:23 UT Visible from New Zealand Summary ------- On 2021 Apr 15 UT, the 92.5 km diameter asteroid (195) Eurykleia will occult a 10.8 mag star in the constellation Scorpius for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.09 mag to 13.81 mag (the magnitude of the asteroid) for at most 13.2 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: 2021 Apr 15, 11:08 - 2021 Apr 15, 11:38 * geocentric midpoint of event [JD]: 2459319.97452083 * magnitude of target star: 10.79 * magnitude drop [mag]: 3.09 * estimated maximum duration [s]: 13.2 * Moon: 10 % sunlit, 172° distance * Sun: 141° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 96 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.018, +/- 0.013) * 1 sigma uncertainty ellipse (major, minor, PA): (0.021", 0.007", 124°) * approx speed of asteroid's shadow [km/s]: 6.9980 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6787-01765-1 by 195 Eurykleia on 2021 Apr 15 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 116 0 0 -28 45 58 11 37 54.7 0 122 -23 .. .. .. -29 16 29 .. .. .. -29 32 59 .... 117 0 0 -29 18 50 11 37 54.5 1 121 -24 -28 48 29 -29 49 16 -28 32 8 -30 5 44 0.29 118 0 0 -29 51 14 11 37 53.9 2 121 -24 -29 20 57 -30 21 36 -29 4 39 -30 38 1 0.27 119 0 0 -30 23 10 11 37 53.1 3 120 -25 -29 52 57 -30 53 27 -29 36 42 -31 9 49 0.26 120 0 0 -30 54 36 11 37 52.0 4 120 -26 -30 24 29 -31 24 49 -30 8 16 -31 41 8 0.26 121 0 0 -31 25 34 11 37 50.6 5 119 -27 -30 55 31 -31 55 41 -30 39 21 -32 11 59 0.26 122 0 0 -31 56 2 11 37 49.0 6 119 -28 -31 26 5 -32 26 5 -31 9 57 -32 42 19 0.26 123 0 0 -32 26 1 11 37 47.1 7 118 -28 -31 56 8 -32 55 58 -31 40 3 -33 12 10 0.26 124 0 0 -32 55 30 11 37 44.9 8 118 -29 -32 25 42 -33 25 22 -32 9 39 -33 41 31 0.26 125 0 0 -33 24 28 11 37 42.5 9 117 -30 -32 54 46 -33 54 16 -32 38 46 -34 10 22 0.26 126 0 0 -33 52 57 11 37 39.9 10 117 -31 -33 23 19 -34 22 39 -33 7 22 -34 38 42 0.26 127 0 0 -34 20 55 11 37 37.0 11 116 -31 -33 51 23 -34 50 32 -33 35 28 -35 6 32 0.26 128 0 0 -34 48 23 11 37 33.9 12 116 -32 -34 18 56 -35 17 54 -34 3 4 -35 33 52 0.26 129 0 0 -35 15 20 11 37 30.6 13 115 -33 -34 45 58 -35 44 46 -34 30 9 -36 0 41 0.26 130 0 0 -35 41 46 11 37 27.1 14 114 -34 -35 12 30 -36 11 7 -34 56 44 -36 26 59 0.26 131 0 0 -36 7 42 11 37 23.4 15 114 -34 -35 38 31 -36 36 58 -35 22 48 -36 52 47 0.26 132 0 0 -36 33 8 11 37 19.5 16 113 -35 -36 4 2 -37 2 18 -35 48 22 -37 18 4 0.26 133 0 0 -36 58 3 11 37 15.4 16 113 -36 -36 29 2 -37 27 7 -36 13 25 -37 42 51 0.26 134 0 0 -37 22 27 11 37 11.2 17 112 -36 -36 53 32 -37 51 27 -36 37 58 -38 7 7 0.26 135 0 0 -37 46 21 11 37 6.7 18 111 -37 -37 17 32 -38 15 15 -37 2 0 -38 30 53 0.26 136 0 0 -38 9 45 11 37 2.1 19 111 -37 -37 41 1 -38 38 34 -37 25 32 -38 54 8 0.26 137 0 0 -38 32 39 11 36 57.4 20 110 -38 -38 4 0 -39 1 22 -37 48 34 -39 16 54 0.26 138 0 0 -38 55 3 11 36 52.5 21 110 -39 -38 26 29 -39 23 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5 45 5 - 7 17 55 0.27 - 53 0 0 - 5 55 32 11 9 9.0 14 243 23 - 5 25 28 - 6 25 40 - 5 9 17 - 6 41 57 0.27 - 52 0 0 - 5 19 52 11 9 4.7 13 243 24 - 4 49 52 - 5 49 57 - 4 33 43 - 6 6 12 0.27 - 51 0 0 - 4 44 27 11 9 0.7 12 243 25 - 4 14 31 - 5 14 28 - 3 58 23 - 5 30 42 0.27 - 50 0 0 - 4 9 17 11 8 57.0 11 242 26 - 3 39 24 - 4 39 14 - 3 23 19 - 4 55 26 0.28 - 49 0 0 - 3 34 23 11 8 53.7 9 242 27 - 3 4 34 - 4 4 16 - 2 48 31 - 4 20 26 0.28 - 48 0 0 - 2 59 47 11 8 50.8 8 242 28 - 2 30 2 - 3 29 36 - 2 14 1 - 3 45 43 0.29 - 47 0 0 - 2 25 28 11 8 48.3 7 242 29 - 1 55 47 - 2 55 13 - 1 39 49 - 3 11 18 0.29 - 46 0 0 - 1 51 29 11 8 46.2 6 242 30 - 1 21 53 - 2 21 10 - 1 5 56 - 2 37 12 0.30 - 45 0 0 - 1 17 50 11 8 44.4 5 242 31 - 0 48 18 - 1 47 26 - 0 32 23 - 2 3 27 0.31 - 44 0 0 - 0 44 32 11 8 43.0 4 242 32 - 0 15 4 - 1 14 4 0 0 48 - 1 30 2 0.33 - 43 0 0 - 0 11 36 11 8 41.9 3 242 34 0 17 47 - 0 41 3 0 33 37 - 0 56 59 0.37 - 42 0 0 0 20 58 11 8 41.3 1 242 35 0 50 16 - 0 8 25 1 6 3 - 0 24 18 0.46 - 41 0 0 0 53 7 11 8 41.0 0 242 36 1 22 21 0 23 49 .. .. .. 0 7 59 1.20 Uncertainty in time = +/- 4 secs Prediction of 2021 Mar 17.0 Data for the target star ------------------------ * name: TYC 6787-01765-1 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 01 58.8510 DE: -27 44 25.541 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 01 58.8511 DE: -27 44 25.541 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (195) Eurykleia asteroid class: approx. diameter [km]: 93 approx. diameter ["]: 0.062 distance from Earth [AU]: 2.05830 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#45 date of fit: 2021 Mar 16 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): 0.021", 0.007", 124.117° remarks: * orbital elements for (195)Eurykleia : Mean anomaly = 101.95269242 deg Arg. of pericenter = 117.99786192 deg Long. of node = 6.97391130 deg Inclination = 6.97147692 deg Eccentricity = 0.04319080 Semimajor axis = 2.87617583 AU Perihelion dist = 2.75195148 AU Mag: H = 9.18, G = 0.15 Epoch of elements : MJD 59319.47451389 TDT (2021 Apr 15.4745) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#452021Mar16,13.22,2021,4,15,11.3885,0.07871,-0.25985,-3.77914,-1.14876,-0.00340,0.00123,0.00000,0.00000 -133.8451,-27.7987,9.18,9.94,False TYC 6787-01765-1,16.03301419,-27.7404281,0.00,10.79,0.00,0.0,0,,16.05478225,-27.7987139 195,Eurykleia,13.81,92.5,2.0583,0,0,-1.217,-4.91,,4.6 0,101.8568,2021,4,15,117.9979,6.9739,6.9715,0.04319,2.87618,2.75195,9.18,5.0,0.15 1.270,0.0207,0.0073,124,0.0167,Known errors,-1.00,-1,-1,-1 20210415_1765-1,59290.00 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2021 Mar 17, 03:45 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org