IOTA/IOTA-ES occultation update for (31) Euphrosyne / UCAC4 640-046061 event on 2023 Nov 17, 18:56 UT Visible from Japan, China Summary ------- On 2023 Nov 17 UT, the 255.9 km diameter asteroid (31) Euphrosyne will occult a 12.4 mag star in the constellation Leo Minor for observers along a path across Japan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.55 mag to 11.90 mag (the magnitude of the asteroid) for at most 11.910 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: 2023 Nov 17, 18:51 - 2023 Nov 17, 19:01 * geocentric midpoint of event [JD]: 2460266.28905221 * magnitude of target star: 12.35 * magnitude drop [mag]: 0.55 * estimated maximum duration [s]: 11.910 * Moon: 21 % sunlit, 136° distance * Sun: 87° distance * rough path description: Japan, China The occultation path -------------------- * approximate projected width [km]: 258 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.021) * 1 sigma uncertainty ellipse (major, minor, PA): (0.034", 0.003", 129°) * approx speed of asteroid's shadow [km/s]: 21.4820 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 640-046061 by 31 Euphrosyne #1 on 2023 Nov 17 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 0 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 5 32 50 .. .. .. 5 45 45 .... 91 0 0 4 50 49 18 51 19.3 1 52 -68 .. .. .. 6 19 44 .. .. .. 6 32 40 .... 92 0 0 5 37 42 18 51 19.5 2 52 -67 4 9 5 7 6 43 3 56 15 7 19 39 -0.18 93 0 0 6 24 38 18 51 19.8 3 52 -67 4 55 56 7 53 43 4 43 6 8 6 40 -0.16 94 0 0 7 11 35 18 51 20.3 5 53 -67 5 42 50 8 40 43 5 29 59 8 53 40 -0.15 95 0 0 7 58 31 18 51 20.9 6 53 -66 6 29 43 9 27 41 6 16 53 9 40 38 -0.15 96 0 0 8 45 24 18 51 21.6 7 53 -66 7 16 35 10 14 35 7 3 44 10 27 33 -0.14 97 0 0 9 32 12 18 51 22.5 8 53 -65 8 3 23 11 1 23 7 50 32 11 14 21 -0.14 98 0 0 10 18 54 18 51 23.6 10 53 -65 8 50 6 11 48 4 8 37 15 12 1 2 -0.14 99 0 0 11 5 27 18 51 24.7 11 53 -64 9 36 41 12 34 35 9 23 50 12 47 32 -0.14 100 0 0 11 51 49 18 51 26.0 12 54 -63 10 23 6 13 20 54 10 10 16 13 33 51 -0.14 101 0 0 12 37 59 18 51 27.5 13 54 -63 11 9 20 14 7 0 10 56 30 14 19 56 -0.14 102 0 0 13 23 55 18 51 29.1 15 54 -62 11 55 21 14 52 50 11 42 32 15 5 46 -0.14 103 0 0 14 9 35 18 51 30.8 16 54 -61 12 41 7 15 38 24 12 28 19 15 51 19 -0.14 104 0 0 14 54 57 18 51 32.6 17 55 -60 13 26 36 16 23 39 13 13 49 16 36 33 -0.13 105 0 0 15 39 59 18 51 34.6 18 55 -60 14 11 46 17 8 33 13 59 1 17 21 26 -0.13 106 0 0 16 24 41 18 51 36.6 20 55 -59 14 56 37 17 53 6 14 43 53 18 5 57 -0.13 107 0 0 17 9 0 18 51 38.8 21 55 -58 15 41 6 18 37 14 15 28 23 18 50 4 -0.13 108 0 0 17 52 54 18 51 41.1 22 56 -57 16 25 11 19 20 58 16 12 30 19 33 46 -0.13 109 0 0 18 36 23 18 51 43.6 23 56 -56 17 8 52 20 4 15 16 56 12 20 17 1 -0.13 110 0 0 19 19 25 18 51 46.1 24 56 -55 17 52 6 20 47 4 17 39 28 20 59 48 -0.13 111 0 0 20 1 59 18 51 48.7 26 57 -54 18 34 53 21 29 24 18 22 17 21 42 6 -0.13 112 0 0 20 44 2 18 51 51.4 27 57 -54 19 17 11 22 11 13 19 4 37 22 23 54 -0.13 113 0 0 21 25 35 18 51 54.2 28 58 -53 19 58 59 22 52 31 19 46 27 23 5 9 -0.13 114 0 0 22 6 36 18 51 57.1 29 58 -52 20 40 16 23 33 16 20 27 46 23 45 52 -0.13 115 0 0 22 47 4 18 52 0.1 30 58 -51 21 21 0 24 13 28 21 8 33 24 26 1 -0.13 116 0 0 23 26 58 18 52 3.2 31 59 -50 22 1 11 24 53 5 21 48 46 25 5 35 -0.13 117 0 0 24 6 18 18 52 6.3 32 59 -49 22 40 48 25 32 6 22 28 25 25 44 34 -0.13 118 0 0 24 45 1 18 52 9.5 34 60 -48 23 19 49 26 10 31 23 7 29 26 22 57 -0.13 119 0 0 25 23 8 18 52 12.8 35 60 -47 23 58 15 26 48 20 23 45 58 27 0 42 -0.13 120 0 0 26 0 38 18 52 16.1 36 61 -46 24 36 4 27 25 30 24 23 50 27 37 50 -0.13 121 0 0 26 37 31 18 52 19.5 37 61 -45 25 13 16 28 2 3 25 1 4 28 14 20 -0.13 122 0 0 27 13 45 18 52 23.0 38 62 -45 25 49 50 28 37 57 25 37 41 28 50 11 -0.13 123 0 0 27 49 20 18 52 26.5 39 62 -44 26 25 45 29 13 12 26 13 39 29 25 23 -0.13 124 0 0 28 24 16 18 52 30.0 40 63 -43 27 1 2 29 47 48 26 48 59 29 59 56 -0.13 125 0 0 28 58 33 18 52 33.6 41 64 -42 27 35 40 30 21 44 27 23 40 30 33 49 -0.13 126 0 0 29 32 11 18 52 37.3 42 64 -41 28 9 38 30 55 0 27 57 41 31 7 1 -0.13 127 0 0 30 5 8 18 52 41.0 43 65 -40 28 42 56 31 27 35 28 31 2 31 39 34 -0.13 128 0 0 30 37 25 18 52 44.7 44 65 -39 29 15 34 31 59 31 29 3 44 32 11 27 -0.13 129 0 0 31 9 2 18 52 48.4 45 66 -38 29 47 33 32 30 46 29 35 45 32 42 39 -0.13 130 0 0 31 39 58 18 52 52.2 46 67 -38 30 18 50 33 1 21 30 7 6 33 13 11 -0.12 131 0 0 32 10 15 18 52 56.0 47 67 -37 30 49 28 33 31 16 30 37 47 33 43 2 -0.12 132 0 0 32 39 50 18 52 59.8 48 68 -36 31 19 25 34 0 30 31 7 47 34 12 13 -0.12 133 0 0 33 8 46 18 53 3.7 49 69 -35 31 48 42 34 29 4 31 37 7 34 40 44 -0.12 134 0 0 33 37 1 18 53 7.6 50 69 -34 32 17 19 34 56 58 32 5 47 35 8 35 -0.12 135 0 0 34 4 37 18 53 11.4 51 70 -33 32 45 16 35 24 12 32 33 46 35 35 46 -0.12 136 0 0 34 31 32 18 53 15.3 52 71 -32 33 12 32 35 50 46 33 1 6 36 2 17 -0.12 137 0 0 34 57 48 18 53 19.3 53 72 -32 33 39 9 36 16 41 33 27 46 36 28 8 -0.12 138 0 0 35 23 24 18 53 23.2 54 72 -31 34 5 6 36 41 56 33 53 46 36 53 20 -0.12 139 0 0 35 48 21 18 53 27.1 55 73 -30 34 30 23 37 6 32 34 19 6 37 17 53 -0.12 140 0 0 36 12 39 18 53 31.0 56 74 -29 34 55 1 37 30 29 34 43 47 37 41 47 -0.12 141 0 0 36 36 18 18 53 35.0 57 75 -28 35 19 0 37 53 48 35 7 49 38 5 3 -0.12 142 0 0 36 59 18 18 53 38.9 57 76 -28 35 42 21 38 16 28 35 31 12 38 27 41 -0.12 143 0 0 37 21 40 18 53 42.9 58 77 -27 36 5 2 38 38 31 35 53 57 38 49 40 -0.12 144 0 0 37 43 25 18 53 46.8 59 78 -26 36 27 6 38 59 56 36 16 3 39 11 3 -0.12 145 0 0 38 4 32 18 53 50.8 60 78 -25 36 48 32 39 20 43 36 37 32 39 31 47 -0.12 146 0 0 38 25 1 18 53 54.7 61 79 -25 37 9 20 39 40 54 36 58 22 39 51 55 -0.12 147 0 0 38 44 54 18 53 58.7 62 80 -24 37 29 31 40 0 28 37 18 36 40 11 27 -0.12 148 0 0 39 4 10 18 54 2.6 63 81 -23 37 49 4 40 19 26 37 38 12 40 30 22 -0.12 149 0 0 39 22 49 18 54 6.6 63 82 -22 38 8 2 40 37 48 37 57 12 40 48 42 -0.12 150 0 0 39 40 53 18 54 10.5 64 83 -22 38 26 23 40 55 35 38 15 35 41 6 26 -0.12 151 0 0 39 58 21 18 54 14.5 65 85 -21 38 44 7 41 12 47 38 33 23 41 23 35 -0.12 152 0 0 40 15 14 18 54 18.4 66 86 -20 39 1 17 41 29 23 38 50 34 41 40 9 -0.12 153 0 0 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Uncertainty in time = +/- 1 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: UCAC4 640-046061 * constellation : Leo Minor * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 10 50 47.2396 DE: +37 50 21.582 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 10 50 47.2398 DE: +37 50 21.581 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.4 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (31) Euphrosyne asteroid class: ShapeModel asteroid system: multiple bodies approx. diameter [km]: 256 approx. diameter ["]: 0.147 distance from Earth [AU]: 2.39620 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#118 date of fit: 2023 Oct 09 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", 0.001", 129.431° remarks: * orbital elements for (31)Euphrosyne : Mean anomaly = 19.2937397428 deg Arg. of pericenter = 61.7805520515 deg Long. of node = 30.7980049860 deg Inclination = 26.3209063668 deg Eccentricity = 0.2159291322 Semimajor axis = 3.1592495769 AU Perihelion dist = 2.4770755574 AU Mag: H = 6.89, G = 0.15 Epoch of elements : MJD 60265.78902778 TDT (2023 Nov 17.7890) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1182023Oct09 Binary solution 1 : Kepler,11.91,2023,11,17,18.937253,-0.002641,0.115618,12.122240,0.259783,-0.005168,0.002655,0.000000,-0.000001 -177.6022,37.7115,-107.81,-19.06,False UCAC4 640-046061,10.84645542,37.8393284,0.00,12.35,0.00,0.0,0,,10.86871714,37.7114878,0.55,0.00,0,0,0 31,Euphrosyne #1,11.90,255.900,2.3962,0,1,3.750,0.95,,4.0,0 ,4.3,672,1.209000,0.0430,1.40,2458565.33,,135.20,80.10, 0,19.1552,2023,11,17,61.7806,30.7980,26.3209,0.21593,3.15925,2.47708,6.89,5.0,0.15 1.072,0.0163,0.0011,129,0.0164,Known errors + binary orbit,-1.00,0,-1,-1 20231117_046061_Ma1,60232.88 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 21:05 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org