IOTA/IOTA-ES occultation update for (85) Io / TYC 4980-00769-1 event on 2024 Jul 02, 08:44 UT Visible from Summary ------- On 2024 Jul 02 UT, the 159.437607555603 km diameter asteroid (85) Io will occult a 9.9 mag star in the constellation Virgo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.56 mag to 12.34 mag (the magnitude of the asteroid) for at most 42.590 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 02, 08:15 - 2024 Jul 02, 09:13 * geocentric midpoint of event [JD]: 2460493.86419391 * magnitude of target star: 9.89 * magnitude drop [mag]: 2.56 * estimated maximum duration [s]: 42.590 * Moon: 15 % sunlit, 156° distance * Sun: 114° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 160 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 4.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.012, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.012", 0.002", 96°) * approx speed of asteroid's shadow [km/s]: 3.7469 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 4980-00769-1 by 85 Io on 2024 Jul 2 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 83 0 0 15 42 38 8 16 1.9 1 96 64 14 59 9 16 26 7 14 56 57 16 28 20 .... 84 0 0 15 36 54 8 16 2.6 2 96 64 14 53 25 16 20 24 14 51 12 16 22 37 0.00 85 0 0 15 30 55 8 16 3.8 3 96 63 14 47 24 16 14 26 14 45 12 16 16 39 0.00 86 0 0 15 24 40 8 16 5.5 4 96 62 14 41 9 16 8 13 14 38 56 16 10 26 -0.01 87 0 0 15 18 10 8 16 7.6 5 97 61 14 34 37 16 1 44 14 32 24 16 3 57 -0.01 88 0 0 15 11 25 8 16 10.3 6 97 60 14 27 50 15 55 0 14 25 37 15 57 13 -0.01 89 0 0 15 4 24 8 16 13.5 7 97 59 14 20 48 15 48 0 14 18 35 15 50 13 -0.01 90 0 0 14 57 7 8 16 17.2 8 97 58 14 13 30 15 40 45 14 11 17 15 42 58 -0.01 91 0 0 14 49 35 8 16 21.4 9 98 57 14 5 56 15 33 14 14 3 43 15 35 28 -0.01 92 0 0 14 41 48 8 16 26.2 10 98 56 13 58 7 15 25 28 13 55 54 15 27 42 -0.01 93 0 0 14 33 44 8 16 31.4 11 98 55 13 50 3 15 17 27 13 47 49 15 19 40 -0.01 94 0 0 14 25 26 8 16 37.2 12 98 54 13 41 42 15 9 9 13 39 29 15 11 23 -0.01 95 0 0 14 16 52 8 16 43.6 13 99 53 13 33 7 15 0 37 13 30 53 15 2 51 -0.01 96 0 0 14 8 2 8 16 50.4 14 99 52 13 24 15 14 51 49 13 22 2 14 54 3 -0.01 97 0 0 13 58 57 8 16 57.8 15 99 51 13 15 8 14 42 46 13 12 55 14 44 59 -0.01 98 0 0 13 49 36 8 17 5.8 16 99 50 13 5 46 14 33 27 13 3 32 14 35 41 -0.01 99 0 0 13 40 0 8 17 14.3 17 100 49 12 56 8 14 23 53 12 53 54 14 26 7 -0.01 100 0 0 13 30 9 8 17 23.3 18 100 48 12 46 15 14 14 3 12 44 1 14 16 17 -0.01 101 0 0 13 20 3 8 17 32.9 19 100 47 12 36 7 14 3 59 12 33 53 14 6 13 -0.01 102 0 0 13 9 41 8 17 43.0 20 100 46 12 25 43 13 53 39 12 23 29 13 55 53 -0.01 103 0 0 12 59 4 8 17 53.7 21 101 45 12 15 4 13 43 4 12 12 50 13 45 18 -0.01 104 0 0 12 48 12 8 18 5.0 22 101 44 12 4 10 13 32 14 12 1 56 13 34 28 -0.01 105 0 0 12 37 5 8 18 16.8 23 101 43 11 53 1 13 21 9 11 50 47 13 23 23 -0.01 106 0 0 12 25 43 8 18 29.2 24 101 42 11 41 37 13 9 49 11 39 23 13 12 3 -0.01 107 0 0 12 14 6 8 18 42.2 25 102 41 11 29 58 12 58 14 11 27 44 13 0 29 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6 52 8 22 43.0 40 105 26 8 22 15 9 51 29 8 19 59 9 53 46 -0.01 122 0 0 8 51 51 8 23 4.5 41 105 25 8 7 12 9 36 31 8 4 56 9 38 47 -0.01 123 0 0 8 36 39 8 23 26.5 42 105 24 7 51 57 9 21 20 7 49 41 9 23 37 -0.01 124 0 0 8 21 15 8 23 49.0 43 105 23 7 36 31 9 5 58 7 34 15 9 8 15 -0.01 125 0 0 8 5 39 8 24 12.0 45 105 21 7 20 54 8 50 25 7 18 37 8 52 41 -0.01 126 0 0 7 49 53 8 24 35.7 46 106 20 7 5 6 8 34 40 7 2 49 8 36 57 -0.01 127 0 0 7 33 56 8 24 59.8 47 106 19 6 49 7 8 18 45 6 46 50 8 21 2 -0.01 128 0 0 7 17 48 8 25 24.4 48 106 18 6 32 58 8 2 40 6 30 41 8 4 57 -0.01 129 0 0 7 1 31 8 25 49.6 49 106 17 6 16 39 7 46 24 6 14 22 7 48 41 -0.01 130 0 0 6 45 4 8 26 15.3 50 106 16 6 0 10 7 29 59 5 57 53 7 32 16 -0.01 131 0 0 6 28 28 8 26 41.5 51 106 15 5 43 32 7 13 25 5 41 15 7 15 42 -0.01 132 0 0 6 11 44 8 27 8.1 52 107 14 5 26 46 6 56 41 5 24 29 6 58 59 -0.01 133 0 0 5 54 50 8 27 35.3 54 107 13 5 9 51 6 39 50 5 7 34 6 42 7 -0.01 134 0 0 5 37 49 8 28 2.9 55 107 11 4 52 49 6 22 50 4 50 31 6 25 8 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-13 31 2 -12 4 24 -13 33 15 -12 2 11 -0.04 -138 0 0 -12 49 22 9 9 56.5 26 270 -80 -13 32 40 -12 6 2 -13 34 52 -12 3 50 -0.04 -137 0 0 -12 50 42 9 10 9.5 25 270 -80 -13 34 0 -12 7 23 -13 36 13 -12 5 11 -0.04 -136 0 0 -12 51 45 9 10 21.9 24 270 -80 -13 35 3 -12 8 26 -13 37 15 -12 6 14 -0.04 -135 0 0 -12 52 31 9 10 33.8 23 270 -80 -13 35 49 -12 9 12 -13 38 1 -12 7 0 -0.04 -134 0 0 -12 52 59 9 10 45.1 22 270 -79 -13 36 17 -12 9 41 -13 38 29 -12 7 28 -0.04 -133 0 0 -12 53 10 9 10 56.0 20 269 -79 -13 36 28 -12 9 52 -13 38 40 -12 7 40 -0.04 -132 0 0 -12 53 4 9 11 6.3 19 269 -79 -13 36 22 -12 9 46 -13 38 34 -12 7 34 -0.03 -131 0 0 -12 52 41 9 11 16.1 18 269 -78 -13 35 59 -12 9 23 -13 38 11 -12 7 11 -0.03 -130 0 0 -12 52 1 9 11 25.3 17 269 -78 -13 35 19 -12 8 43 -13 37 31 -12 6 30 -0.03 -129 0 0 -12 51 5 9 11 34.1 16 268 -77 -13 34 22 -12 7 46 -13 36 34 -12 5 34 -0.03 -128 0 0 -12 49 51 9 11 42.3 15 268 -77 -13 33 9 -12 6 32 -13 35 21 -12 4 20 -0.03 -127 0 0 -12 48 21 9 11 50.0 14 268 -76 -13 31 39 -12 5 2 -13 33 51 -12 2 50 -0.03 -126 0 0 -12 46 35 9 11 57.2 13 268 -75 -13 29 53 -12 3 15 -13 32 5 -12 1 3 -0.03 -125 0 0 -12 44 32 9 12 3.8 12 268 -75 -13 27 51 -12 1 12 -13 30 3 -11 59 0 -0.03 -124 0 0 -12 42 13 9 12 10.0 11 267 -74 -13 25 33 -11 58 53 -13 27 45 -11 56 41 -0.03 -123 0 0 -12 39 39 9 12 15.6 10 267 -73 -13 22 58 -11 56 18 -13 25 11 -11 54 5 -0.03 -122 0 0 -12 36 48 9 12 20.7 9 267 -72 -13 20 8 -11 53 27 -13 22 20 -11 51 14 -0.03 -121 0 0 -12 33 41 9 12 25.3 8 267 -71 -13 17 2 -11 50 20 -13 19 15 -11 48 7 -0.03 -120 0 0 -12 30 19 9 12 29.4 7 266 -71 -13 13 41 -11 46 57 -13 15 53 -11 44 44 -0.03 -119 0 0 -12 26 42 9 12 32.9 6 266 -70 -13 10 4 -11 43 19 -13 12 16 -11 41 6 -0.03 -118 0 0 -12 22 49 9 12 36.0 5 266 -69 -13 6 12 -11 39 25 -13 8 24 -11 37 12 -0.02 -117 0 0 -12 18 41 9 12 38.5 4 266 -68 -13 2 4 -11 35 16 -13 4 17 -11 33 4 -0.02 -116 0 0 -12 14 18 9 12 40.5 3 266 -67 -12 57 42 -11 30 52 -12 59 55 -11 28 40 -0.02 -115 0 0 -12 9 40 9 12 42.1 2 265 -66 -12 53 5 -11 26 13 -12 55 17 -11 24 1 -0.02 -114 0 0 -12 4 47 9 12 43.1 1 265 -65 -12 48 13 -11 21 20 -12 50 26 -11 19 7 -0.01 -113 0 0 -11 59 39 9 12 43.6 1 265 -64 -12 43 7 -11 16 12 -12 45 19 -11 13 59 0.02 Uncertainty in time = +/- 5 secs Prediction of 2023 Jul 15.2 Data for the target star ------------------------ * name: TYC 4980-00769-1 * constellation : Virgo * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 14 20 51.5714 DE: -04 58 06.554 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 14 20 51.5711 DE: -04 58 06.552 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 9.9 * B mag [mag]: 10.2 * Diameter [mas]: 0.10 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (85) Io asteroid class: approx. diameter [km]: 159 approx. diameter ["]: 0.112 distance from Earth [AU]: 1.96330 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#120 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): 0.012", 0.002", 96.196° remarks: * orbital elements for (85)Io : Mean anomaly = 292.7575111378 deg Arg. of pericenter = 122.8852524215 deg Long. of node = 203.0500921412 deg Inclination = 11.9606106211 deg Eccentricity = 0.1934065905 Semimajor axis = 2.6539170784 AU Perihelion dist = 2.1406320248 AU Mag: H = 7.81, G = 0.15 Epoch of elements : MJD 60493.36419421 TDT (2024 Jul 02.3642) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1202023Apr24,42.59,2024,7,2,8.740654,0.009118,0.032419,2.053477,-0.505785,0.004614,-0.001956,0.000001,0.000000 163.5431,-5.0808,49.93,22.99,False TYC 4980-00769-1,14.34765874,-4.9684873,10.22,9.89,9.71,0.1,0,,14.36914728,-5.0808103,2.56,2.32,0,0,1 85,Io,12.34,159.580,1.9633,0,0,0.617,-2.27,,8.0,0 0,292.6745,2024,7,2,122.8853,203.0501,11.9606,0.19341,2.65392,2.14063,7.80,5.0,0.15 1.025,0.0123,0.0024,96,0.0028,Known errors,1.13,0,-1,-1 20240702_0769-1,60140.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 04:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org