IOTA/IOTA-ES occultation update for (68) Leto / UCAC4 290-157776 event on 2024 Jun 08, 06:27 UT Visible from Summary ------- On 2024 Jun 08 UT, the 122.407298118322 km diameter asteroid (68) Leto will occult a 9.8 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 1.29 mag to 10.69 mag (the magnitude of the asteroid) for at most 12.130 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 Jun 08, 06:17 - 2024 Jun 08, 06:37 * geocentric midpoint of event [JD]: 2460469.76883563 * magnitude of target star: 9.79 * magnitude drop [mag]: 1.29 * estimated maximum duration [s]: 12.130 * Moon: 4 % sunlit, 170° distance * Sun: 164° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 134 * 1 sigma uncertainty interval [path widths]: +/- 0.06 * 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", 93°) * approx speed of asteroid's shadow [km/s]: 10.1225 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 290-157776 by 68 Leto on 2024 Jun 8 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 -171 0 0 4 38 4 6 36 46.3 0 122 -15 .. .. .. 3 55 0 .. .. .. 3 49 50 .... -170 0 0 4 0 39 6 36 46.1 1 122 -16 4 43 47 3 17 48 4 49 0 3 12 39 -0.14 -169 0 0 3 23 52 6 36 45.7 3 122 -17 4 6 46 2 41 14 4 11 58 2 36 7 -0.28 -168 0 0 2 47 44 6 36 44.9 4 122 -18 3 30 26 2 5 19 3 35 36 2 0 13 -0.34 -167 0 0 2 12 16 6 36 43.9 5 122 -20 2 54 45 1 30 4 2 59 53 1 25 0 -0.37 -166 0 0 1 37 29 6 36 42.5 6 122 -21 2 19 44 0 55 29 2 24 51 0 50 27 -0.38 -165 0 0 1 3 21 6 36 41.0 7 122 -22 1 45 24 0 21 35 1 50 29 0 16 33 -0.39 -164 0 0 0 29 55 6 36 39.1 8 123 -23 1 11 45 - 0 11 39 1 16 49 - 0 16 39 -0.40 -163 0 0 - 0 2 50 6 36 37.0 9 123 -24 0 38 47 - 0 44 12 0 43 49 - 0 49 10 -0.41 -162 0 0 - 0 34 54 6 36 34.7 11 123 -25 0 6 31 - 1 16 3 0 11 32 - 1 21 0 -0.41 -161 0 0 - 1 6 16 6 36 32.1 12 123 -26 - 0 25 3 - 1 47 14 - 0 20 4 - 1 52 9 -0.42 -160 0 0 - 1 36 56 6 36 29.3 13 123 -28 - 0 55 56 - 2 17 42 - 0 50 58 - 2 22 36 -0.42 -159 0 0 - 2 6 55 6 36 26.3 14 123 -29 - 1 26 6 - 2 47 29 - 1 21 10 - 2 52 22 -0.42 -158 0 0 - 2 36 12 6 36 23.0 15 123 -30 - 1 55 35 - 3 16 35 - 1 50 39 - 3 21 26 -0.42 -157 0 0 - 3 4 46 6 36 19.5 16 123 -31 - 2 24 21 - 3 44 58 - 2 19 27 - 3 49 48 -0.43 -156 0 0 - 3 32 39 6 36 15.8 17 123 -32 - 2 52 24 - 4 12 40 - 2 47 32 - 4 17 29 -0.43 -155 0 0 - 3 59 50 6 36 11.8 18 122 -33 - 3 19 46 - 4 39 40 - 3 14 55 - 4 44 27 -0.43 -154 0 0 - 4 26 18 6 36 7.7 19 122 -34 - 3 46 25 - 5 5 58 - 3 41 36 - 5 10 44 -0.43 -153 0 0 - 4 52 5 6 36 3.4 20 122 -35 - 4 12 23 - 5 31 35 - 4 7 34 - 5 36 20 -0.43 -152 0 0 - 5 17 10 6 35 58.9 21 122 -36 - 4 37 38 - 5 56 29 - 4 32 50 - 6 1 13 -0.43 -151 0 0 - 5 41 33 6 35 54.1 22 122 -37 - 5 2 11 - 6 20 43 - 4 57 25 - 6 25 25 -0.43 -150 0 0 - 6 5 15 6 35 49.2 23 122 -38 - 5 26 2 - 6 44 15 - 5 21 17 - 6 48 56 -0.43 -149 0 0 - 6 28 15 6 35 44.2 24 122 -39 - 5 49 11 - 7 7 5 - 5 44 28 - 7 11 46 -0.43 -148 0 0 - 6 50 33 6 35 38.9 25 122 -40 - 6 11 39 - 7 29 15 - 6 6 56 - 7 33 54 -0.43 -147 0 0 - 7 12 10 6 35 33.5 27 122 -41 - 6 33 25 - 7 50 43 - 6 28 44 - 7 55 22 -0.43 -146 0 0 - 7 33 7 6 35 27.9 28 122 -42 - 6 54 30 - 8 11 31 - 6 49 50 - 8 16 8 -0.43 -145 0 0 - 7 53 22 6 35 22.1 29 122 -43 - 7 14 54 - 8 31 38 - 7 10 14 - 8 36 14 -0.43 -144 0 0 - 8 12 56 6 35 16.2 29 122 -44 - 7 34 36 - 8 51 4 - 7 29 58 - 8 55 40 -0.43 -143 0 0 - 8 31 50 6 35 10.1 30 122 -45 - 7 53 38 - 9 9 50 - 7 49 0 - 9 14 25 -0.43 -142 0 0 - 8 50 3 6 35 3.9 31 122 -46 - 8 11 59 - 9 27 56 - 8 7 22 - 9 32 30 -0.43 -141 0 0 - 9 7 36 6 34 57.6 32 122 -47 - 8 29 39 - 9 45 22 - 8 25 4 - 9 49 55 -0.43 -140 0 0 - 9 24 30 6 34 51.1 33 122 -48 - 8 46 39 -10 2 8 - 8 42 5 -10 6 40 -0.43 -139 0 0 - 9 40 43 6 34 44.4 34 122 -49 - 9 2 59 -10 18 15 - 8 58 26 -10 22 46 -0.43 -138 0 0 - 9 56 16 6 34 37.6 35 122 -50 - 9 18 39 -10 33 42 - 9 14 6 -10 38 12 -0.43 -137 0 0 -10 11 10 6 34 30.7 36 123 -51 - 9 33 40 -10 48 29 - 9 29 7 -10 52 59 -0.43 -136 0 0 -10 25 25 6 34 23.7 37 123 -52 - 9 48 0 -11 2 38 - 9 43 29 -11 7 7 -0.43 -135 0 0 -10 39 0 6 34 16.5 38 123 -53 -10 1 42 -11 16 8 - 9 57 11 -11 20 36 -0.43 -134 0 0 -10 51 57 6 34 9.3 39 123 -54 -10 14 44 -11 28 59 -10 10 13 -11 33 26 -0.43 -133 0 0 -11 4 14 6 34 1.8 40 123 -55 -10 27 6 -11 41 12 -10 22 37 -11 45 38 -0.43 -132 0 0 -11 15 53 6 33 54.3 41 123 -56 -10 38 51 -11 52 46 -10 34 22 -11 57 12 -0.43 -131 0 0 -11 26 54 6 33 46.7 42 123 -57 -10 49 56 -12 3 42 -10 45 28 -12 8 7 -0.43 -130 0 0 -11 37 17 6 33 39.0 43 123 -58 -11 0 23 -12 14 0 -10 55 55 -12 18 25 -0.43 -129 0 0 -11 47 1 6 33 31.1 43 123 -59 -11 10 11 -12 23 40 -11 5 44 -12 28 5 -0.43 -128 0 0 -11 56 7 6 33 23.2 44 124 -60 -11 19 21 -12 32 42 -11 14 55 -12 37 6 -0.43 -127 0 0 -12 4 36 6 33 15.1 45 124 -61 -11 27 54 -12 41 7 -11 23 27 -12 45 31 -0.43 -126 0 0 -12 12 26 6 33 6.9 46 124 -62 -11 35 48 -12 48 55 -11 31 22 -12 53 18 -0.43 -125 0 0 -12 19 39 6 32 58.7 47 124 -63 -11 43 4 -12 56 5 -11 38 38 -13 0 28 -0.43 -124 0 0 -12 26 15 6 32 50.3 48 125 -63 -11 49 43 -13 2 38 -11 45 18 -13 7 0 -0.43 -123 0 0 -12 32 14 6 32 41.9 49 125 -64 -11 55 44 -13 8 33 -11 51 19 -13 12 56 -0.43 -122 0 0 -12 37 35 6 32 33.3 49 125 -65 -12 1 8 -13 13 52 -11 56 43 -13 18 14 -0.43 -121 0 0 -12 42 19 6 32 24.7 50 126 -66 -12 5 54 -13 18 34 -12 1 29 -13 22 56 -0.43 -120 0 0 -12 46 26 6 32 16.0 51 126 -67 -12 10 3 -13 22 40 -12 5 39 -13 27 1 -0.43 -119 0 0 -12 49 57 6 32 7.2 52 126 -68 -12 13 35 -13 26 9 -12 9 11 -13 30 30 -0.43 -118 0 0 -12 52 50 6 31 58.3 53 127 -69 -12 16 30 -13 29 1 -12 12 6 -13 33 22 -0.43 -117 0 0 -12 55 7 6 31 49.3 53 127 -69 -12 18 48 -13 31 16 -12 14 24 -13 35 37 -0.43 -116 0 0 -12 56 47 6 31 40.3 54 128 -70 -12 20 28 -13 32 56 -12 16 5 -13 37 17 -0.43 -115 0 0 -12 57 50 6 31 31.1 55 128 -71 -12 21 33 -13 33 58 -12 17 9 -13 38 19 -0.43 -114 0 0 -12 58 17 6 31 21.9 56 129 -72 -12 22 0 -13 34 25 -12 17 36 -13 38 46 -0.43 -113 0 0 -12 58 8 6 31 12.6 56 130 -73 -12 21 50 -13 34 15 -12 17 27 -13 38 36 -0.43 -112 0 0 -12 57 22 6 31 3.3 57 130 -73 -12 21 4 -13 33 29 -12 16 41 -13 37 50 -0.43 -111 0 0 -12 55 59 6 30 53.8 58 131 -74 -12 19 41 -13 32 7 -12 15 17 -13 36 28 -0.43 -110 0 0 -12 54 0 6 30 44.3 58 132 -75 -12 17 41 -13 30 9 -12 13 18 -13 34 30 -0.43 -109 0 0 -12 51 24 6 30 34.7 59 133 -75 -12 15 5 -13 27 34 -12 10 41 -13 31 55 -0.43 -108 0 0 -12 48 12 6 30 25.1 60 134 -76 -12 11 52 -13 24 23 -12 7 28 -13 28 44 -0.43 -107 0 0 -12 44 24 6 30 15.3 60 135 -76 -12 8 2 -13 20 36 -12 3 38 -13 24 57 -0.43 -106 0 0 -12 39 59 6 30 5.5 61 136 -77 -12 3 36 -13 16 13 -11 59 11 -13 20 34 -0.43 -105 0 0 -12 34 58 6 29 55.7 62 137 -77 -11 58 32 -13 11 13 -11 54 8 -13 15 35 -0.43 -104 0 0 -12 29 20 6 29 45.8 62 138 -78 -11 52 52 -13 5 38 -11 48 28 -13 10 0 -0.43 -103 0 0 -12 23 6 6 29 35.8 63 139 -78 -11 46 36 -12 59 26 -11 42 11 -13 3 48 -0.43 -102 0 0 -12 16 15 6 29 25.7 63 141 -78 -11 39 42 -12 52 37 -11 35 17 -12 57 0 -0.43 -101 0 0 -12 8 47 6 29 15.6 64 142 -79 -11 32 12 -12 45 13 -11 27 46 -12 49 36 -0.43 -100 0 0 -12 0 43 6 29 5.5 64 144 -79 -11 24 5 -12 37 12 -11 19 39 -12 41 35 -0.43 - 99 0 0 -11 52 2 6 28 55.2 65 145 -79 -11 15 21 -12 28 34 -11 10 54 -12 32 58 -0.43 - 98 0 0 -11 42 45 6 28 45.0 65 147 -79 -11 5 59 -12 19 20 -11 1 33 -12 23 44 -0.43 - 97 0 0 -11 32 50 6 28 34.6 65 149 -79 -10 56 1 -12 9 29 -10 51 34 -12 13 54 -0.43 - 96 0 0 -11 22 19 6 28 24.2 66 150 -78 -10 45 26 -11 59 2 -10 40 58 -12 3 27 -0.43 - 95 0 0 -11 11 10 6 28 13.8 66 152 -78 -10 34 13 -11 47 58 -10 29 45 -11 52 23 -0.43 - 94 0 0 -10 59 25 6 28 3.3 66 154 -78 -10 22 23 -11 36 17 -10 17 54 -11 40 43 -0.43 - 93 0 0 -10 47 2 6 27 52.8 66 156 -77 -10 9 55 -11 23 59 -10 5 26 -11 28 25 -0.43 - 92 0 0 -10 34 2 6 27 42.2 67 158 -77 - 9 56 51 -11 11 4 - 9 52 21 -11 15 31 -0.43 - 91 0 0 -10 20 25 6 27 31.6 67 160 -76 - 9 43 8 -10 57 32 - 9 38 37 -11 2 0 -0.43 - 90 0 0 -10 6 11 6 27 21.0 67 162 -75 - 9 28 48 -10 43 22 - 9 24 17 -10 47 51 -0.43 - 89 0 0 - 9 51 18 6 27 10.3 67 164 -75 - 9 13 50 -10 28 36 - 9 9 18 -10 33 5 -0.43 - 88 0 0 - 9 35 49 6 26 59.5 67 166 -74 - 8 58 14 -10 13 12 - 8 53 42 -10 17 42 -0.43 - 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23 0 0 27 27 57 6 17 39.3 10 226 -5 28 15 39 26 40 38 28 21 26 26 34 57 -0.46 - 22 0 0 28 12 11 6 17 37.1 9 226 -3 28 59 56 27 24 50 29 5 43 27 19 8 -0.46 - 21 0 0 28 56 12 6 17 35.2 8 227 -2 29 43 59 28 8 49 29 49 46 28 3 8 -0.46 - 20 0 0 29 39 59 6 17 33.5 7 227 -1 30 27 46 28 52 35 30 33 34 28 46 53 -0.46 - 19 0 0 30 23 29 6 17 32.1 5 228 0 31 11 17 29 36 4 31 17 5 29 30 22 -0.47 - 18 0 0 31 6 41 6 17 31.0 4 228 1 31 54 29 30 19 16 32 0 17 30 13 35 -0.47 - 17 0 0 31 49 33 6 17 30.1 3 229 2 32 37 20 31 2 9 32 43 8 30 56 28 -0.47 - 16 0 0 32 32 4 6 17 29.6 2 229 3 33 19 50 31 44 42 33 25 37 31 39 0 -0.48 - 15 0 0 33 14 12 6 17 29.2 1 230 4 34 1 55 32 26 52 34 7 42 32 21 10 -0.49 - 14 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 33 8 38 .. .. .. 33 2 57 .... Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: UCAC4 290-157776 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 07 00.5253 DE: -32 03 08.317 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 07 00.5253 DE: -32 03 08.317 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 9.8 * B mag [mag]: 11.1 * Diameter [mas]: 0.30 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (68) Leto asteroid class: approx. diameter [km]: 122 approx. diameter ["]: 0.103 distance from Earth [AU]: 1.63480 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#129 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", 92.6° remarks: * orbital elements for (68)Leto : Mean anomaly = 298.0590990137 deg Arg. of pericenter = 304.7959772187 deg Long. of node = 44.0540987187 deg Inclination = 7.9610076806 deg Eccentricity = 0.1845673542 Semimajor axis = 2.7833506254 AU Perihelion dist = 2.2696349646 AU Mag: H = 7.06, G = 0.05 Epoch of elements : MJD 60469.26883630 TDT (2024 Jun 08.2688) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1292023Apr24,12.13,2024,6,8,6.452055,-0.119646,0.375982,-5.444337,-1.732693,-0.001328,0.000784,0.000001,0.000000 -81.7598,-32.0497,83.01,22.89,False UCAC4 290-157776,18.11681257,-32.0523103,11.10,9.79,9.08,0.3,4,,18.14370406,-32.0497010,1.30,1.48,0,0,0 68,Leto,10.69,122.763,1.6348,0,0,-2.303,-9.32,,6.0,0 0,298.0020,2024,6,8,304.7960,44.0541,7.9610,0.18457,2.78335,2.26963,7.05,5.0,0.15 1.060,0.0160,0.0031,93,0.0062,Known errors,0.63,0,-1,-1 20240608_157776,60139.37 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 08:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org