IOTA/IOTA-ES occultation update for (816) Juliana / UCAC4 518-037048 event on 2024 Sep 18, 19:07 UT Visible from Summary ------- On 2024 Sep 18 UT, the 57.107 km diameter asteroid (816) Juliana will occult a 11.5 mag star in the constellation Gemini for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.66 mag to 16.17 mag (the magnitude of the asteroid) for at most 2.140 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: 2024 Sep 18, 19:03 - 2024 Sep 18, 19:11 * geocentric midpoint of event [JD]: 2460572.29670654 * magnitude of target star: 11.52 * magnitude drop [mag]: 4.66 * estimated maximum duration [s]: 2.140 * Moon: 99 % sunlit, 99° distance * Sun: 70° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 60 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.002", 82°) * approx speed of asteroid's shadow [km/s]: 26.6490 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 518-037048 by 816 Juliana on 2024 Sep 18 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 95 0 0 -10 50 0 19 3 27.5 0 76 -66 .. .. .. -10 33 17 .. .. .. -10 27 52 .... 96 0 0 -10 35 35 19 3 27.5 1 76 -65 -10 52 19 -10 18 52 -10 57 45 -10 13 28 0.08 97 0 0 -10 21 18 19 3 27.6 2 76 -64 -10 38 1 -10 4 36 -10 43 27 - 9 59 11 0.20 98 0 0 -10 7 9 19 3 27.8 3 76 -63 -10 23 52 - 9 50 28 -10 29 18 - 9 45 4 0.24 99 0 0 - 9 53 10 19 3 28.1 4 76 -62 -10 9 52 - 9 36 29 -10 15 18 - 9 31 5 0.26 100 0 0 - 9 39 20 19 3 28.5 5 75 -62 - 9 56 2 - 9 22 40 -10 1 27 - 9 17 16 0.27 101 0 0 - 9 25 40 19 3 28.9 6 75 -61 - 9 42 21 - 9 9 0 - 9 47 46 - 9 3 36 0.28 102 0 0 - 9 12 9 19 3 29.4 7 75 -60 - 9 28 50 - 8 55 30 - 9 34 14 - 8 50 7 0.28 103 0 0 - 8 58 49 19 3 30.0 8 75 -59 - 9 15 29 - 8 42 10 - 9 20 53 - 8 36 47 0.29 104 0 0 - 8 45 39 19 3 30.7 9 75 -58 - 9 2 18 - 8 29 1 - 9 7 42 - 8 23 38 0.29 105 0 0 - 8 32 40 19 3 31.4 10 75 -57 - 8 49 18 - 8 16 3 - 8 54 42 - 8 10 40 0.29 106 0 0 - 8 19 51 19 3 32.3 11 74 -56 - 8 36 29 - 8 3 15 - 8 41 53 - 7 57 52 0.30 107 0 0 - 8 7 14 19 3 33.2 12 74 -55 - 8 23 52 - 7 50 39 - 8 29 15 - 7 45 16 0.30 108 0 0 - 7 54 49 19 3 34.1 13 74 -54 - 8 11 26 - 7 38 14 - 8 16 49 - 7 32 51 0.30 109 0 0 - 7 42 35 19 3 35.2 14 74 -53 - 7 59 11 - 7 26 1 - 8 4 35 - 7 20 39 0.30 110 0 0 - 7 30 34 19 3 36.3 15 74 -52 - 7 47 9 - 7 14 0 - 7 52 32 - 7 8 38 0.30 111 0 0 - 7 18 44 19 3 37.5 16 74 -51 - 7 35 19 - 7 2 11 - 7 40 42 - 6 56 49 0.30 112 0 0 - 7 7 7 19 3 38.8 17 73 -50 - 7 23 41 - 6 50 35 - 7 29 4 - 6 45 13 0.30 113 0 0 - 6 55 43 19 3 40.2 18 73 -49 - 7 12 17 - 6 39 11 - 7 17 39 - 6 33 50 0.31 114 0 0 - 6 44 32 19 3 41.6 19 73 -48 - 7 1 5 - 6 28 1 - 7 6 27 - 6 22 40 0.31 115 0 0 - 6 33 34 19 3 43.1 20 73 -47 - 6 50 6 - 6 17 3 - 6 55 28 - 6 11 42 0.31 116 0 0 - 6 22 49 19 3 44.7 21 73 -46 - 6 39 21 - 6 6 19 - 6 44 43 - 6 0 59 0.31 117 0 0 - 6 12 19 19 3 46.4 22 73 -45 - 6 28 49 - 5 55 49 - 6 34 11 - 5 50 29 0.31 118 0 0 - 6 2 1 19 3 48.1 23 73 -44 - 6 18 32 - 5 45 33 - 6 23 53 - 5 40 12 0.31 119 0 0 - 5 51 58 19 3 49.9 24 72 -43 - 6 8 28 - 5 35 30 - 6 13 49 - 5 30 10 0.31 120 0 0 - 5 42 10 19 3 51.8 25 72 -42 - 5 58 39 - 5 25 42 - 6 4 0 - 5 20 22 0.31 121 0 0 - 5 32 35 19 3 53.7 26 72 -41 - 5 49 4 - 5 16 8 - 5 54 24 - 5 10 48 0.31 122 0 0 - 5 23 15 19 3 55.7 27 72 -40 - 5 39 43 - 5 6 49 - 5 45 4 - 5 1 29 0.31 123 0 0 - 5 14 10 19 3 57.8 28 72 -39 - 5 30 38 - 4 57 44 - 5 35 58 - 4 52 25 0.31 124 0 0 - 5 5 20 19 4 0.0 29 71 -38 - 5 21 47 - 4 48 55 - 5 27 7 - 4 43 36 0.31 125 0 0 - 4 56 45 19 4 2.2 30 71 -37 - 5 13 11 - 4 40 21 - 5 18 32 - 4 35 2 0.31 126 0 0 - 4 48 26 19 4 4.5 31 71 -36 - 5 4 51 - 4 32 1 - 5 10 11 - 4 26 43 0.31 127 0 0 - 4 40 21 19 4 6.8 32 71 -35 - 4 56 46 - 4 23 58 - 5 2 6 - 4 18 39 0.31 128 0 0 - 4 32 33 19 4 9.2 33 71 -34 - 4 48 57 - 4 16 10 - 4 54 17 - 4 10 51 0.31 129 0 0 - 4 25 0 19 4 11.7 34 70 -33 - 4 41 24 - 4 8 37 - 4 46 43 - 4 3 19 0.31 130 0 0 - 4 17 43 19 4 14.2 35 70 -32 - 4 34 7 - 4 1 21 - 4 39 26 - 3 56 3 0.31 131 0 0 - 4 10 42 19 4 16.8 36 70 -31 - 4 27 5 - 3 54 20 - 4 32 24 - 3 49 3 0.31 132 0 0 - 4 3 57 19 4 19.5 37 70 -30 - 4 20 20 - 3 47 36 - 4 25 39 - 3 42 18 0.31 133 0 0 - 3 57 29 19 4 22.2 38 69 -29 - 4 13 51 - 3 41 8 - 4 19 10 - 3 35 50 0.32 134 0 0 - 3 51 17 19 4 25.0 39 69 -28 - 4 7 38 - 3 34 56 - 4 12 57 - 3 29 39 0.32 135 0 0 - 3 45 21 19 4 27.9 40 69 -27 - 4 1 42 - 3 29 1 - 4 7 1 - 3 23 44 0.32 136 0 0 - 3 39 42 19 4 30.8 41 69 -26 - 3 56 3 - 3 23 23 - 4 1 21 - 3 18 5 0.32 137 0 0 - 3 34 20 19 4 33.7 42 68 -25 - 3 50 40 - 3 18 1 - 3 55 58 - 3 12 44 0.32 138 0 0 - 3 29 14 19 4 36.7 43 68 -24 - 3 45 34 - 3 12 56 - 3 50 53 - 3 7 39 0.32 139 0 0 - 3 24 26 19 4 39.8 44 68 -23 - 3 40 46 - 3 8 8 - 3 46 4 - 3 2 51 0.32 140 0 0 - 3 19 54 19 4 42.9 45 67 -22 - 3 36 14 - 3 3 36 - 3 41 32 - 2 58 20 0.32 141 0 0 - 3 15 40 19 4 46.1 46 67 -21 - 3 31 59 - 2 59 22 - 3 37 17 - 2 54 6 0.32 142 0 0 - 3 11 43 19 4 49.3 47 66 -20 - 3 28 2 - 2 55 26 - 3 33 20 - 2 50 9 0.32 143 0 0 - 3 8 3 19 4 52.6 48 66 -19 - 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6 36 22 - 5 52 37 0.32 -166 0 0 - 6 25 9 19 8 17.4 66 327 32 - 6 41 41 - 6 8 37 - 6 47 3 - 6 3 16 0.32 -165 0 0 - 6 36 3 19 8 21.5 66 325 33 - 6 52 36 - 6 19 31 - 6 57 59 - 6 14 10 0.32 -164 0 0 - 6 47 11 19 8 25.6 65 324 34 - 7 3 45 - 6 30 39 - 7 9 8 - 6 25 17 0.32 -163 0 0 - 6 58 33 19 8 29.6 64 322 35 - 7 15 8 - 6 42 0 - 7 20 30 - 6 36 38 0.32 -162 0 0 - 7 10 8 19 8 33.7 63 321 36 - 7 26 43 - 6 53 34 - 7 32 6 - 6 48 12 0.32 -161 0 0 - 7 21 56 19 8 37.7 63 319 37 - 7 38 32 - 7 5 22 - 7 43 55 - 7 0 0 0.32 -160 0 0 - 7 33 57 19 8 41.7 62 318 38 - 7 50 34 - 7 17 22 - 7 55 57 - 7 12 0 0.32 -159 0 0 - 7 46 11 19 8 45.6 61 317 39 - 8 2 48 - 7 29 35 - 8 8 12 - 7 24 13 0.32 -158 0 0 - 7 58 37 19 8 49.6 60 316 40 - 8 15 15 - 7 42 1 - 8 20 39 - 7 36 38 0.32 -157 0 0 - 8 11 15 19 8 53.5 59 314 41 - 8 27 54 - 7 54 38 - 8 33 18 - 7 49 15 0.32 -156 0 0 - 8 24 5 19 8 57.3 58 313 42 - 8 40 45 - 8 7 28 - 8 46 9 - 8 2 4 0.32 -155 0 0 - 8 37 7 19 9 1.1 57 312 43 - 8 53 47 - 8 20 29 - 8 59 12 - 8 15 5 0.32 -154 0 0 - 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99 0 0 -23 7 36 19 11 2.7 3 286 64 -23 24 26 -22 50 48 -23 29 54 -22 45 21 0.33 - 98 0 0 -23 22 31 19 11 2.9 2 286 63 -23 39 20 -23 5 43 -23 44 48 -23 0 16 0.34 - 97 0 0 -23 37 18 19 11 3.0 1 285 62 -23 54 7 -23 20 31 -23 59 35 -23 15 4 0.36 - 96 0 0 -23 51 58 19 11 3.1 0 285 62 -24 8 46 -23 35 11 -24 14 14 -23 29 45 0.48 Uncertainty in time = +/- 1 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: UCAC4 518-037048 * constellation : Gemini * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 07 04 07.5431 DE: +13 31 14.124 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 07 04 07.5431 DE: +13 31 14.124 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 11.5 * B mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (816) Juliana asteroid class: approx. diameter [km]: 57 approx. diameter ["]: 0.026 distance from Earth [AU]: 3.01430 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 date of fit: 2023 Apr 27 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): 0.015", 0.002", 81.528° remarks: * orbital elements for (816)Juliana : Mean anomaly = 307.2005608930 deg Arg. of pericenter = 20.6750381070 deg Long. of node = 127.5722243024 deg Inclination = 14.3160347709 deg Eccentricity = 0.1044283601 Semimajor axis = 3.0083567815 AU Perihelion dist = 2.6941990163 AU Mag: H = 10.52, G = 0.15 Epoch of elements : MJD 60571.79670567 TDT (2024 Sep 18.7967) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582023Apr27,2.14,2024,9,18,19.120957,-0.035254,-0.303659,14.938227,-1.759149,-0.005331,0.000305,0.000000,0.000000 -178.6281,13.4859,-108.35,1.45,False UCAC4 518-037048,7.06876194,13.5205900,12.21,11.52,11.15,0.0,0,,7.09184283,13.4858923,4.66,4.58,0,0,0 816,Juliana,16.17,57.107,3.0143,0,0,2.988,-5.13,,2.8,0 0,307.0501,2024,9,18,20.6750,127.5722,14.3160,0.10443,3.00836,2.69420,10.52,5.0,0.15 1.162,0.0147,0.0019,82,0.0042,Known errors,1.08,0,-1,-1 20240918_037048,60140.57 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 13:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org