IOTA/IOTA-ES occultation update for (54) Alexandra / HIP 86650 event on 2023 Feb 08, 19:44 UT Visible from Australia Summary ------- On 2023 Feb 08 UT, the 152.1 km diameter asteroid (54) Alexandra will occult a 7.8 mag star in the constellation Scorpius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.17 mag to 12.93 mag (the magnitude of the asteroid) for at most 3.950 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: 2023 Feb 08, 19:41 - 2023 Feb 08, 19:46 * geocentric midpoint of event [JD]: 2459984.32229721 * magnitude of target star: 7.77 * magnitude drop [mag]: 5.17 * estimated maximum duration [s]: 3.950 * Moon: 91 % sunlit, 93° distance * Sun: 54° distance * rough path description: Australia Additional comments ------------------- duplicated source The occultation path -------------------- * approximate projected width [km]: 152 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 0.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.015", 0.001", 84°) * approx speed of asteroid's shadow [km/s]: 38.4992 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 86650 by 54 Alexandra on 2023 Feb 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 104 0 0 1 55 59 19 41 20.9 1 123 -52 1 6 59 2 44 58 1 3 45 2 48 11 .... 105 0 0 1 17 21 19 41 21.0 2 123 -51 0 28 20 2 6 21 0 25 6 2 9 35 0.10 106 0 0 0 38 39 19 41 21.1 3 123 -50 - 0 10 23 1 27 40 - 0 13 37 1 30 54 0.07 107 0 0 - 0 0 6 19 41 21.3 4 123 -49 - 0 49 9 0 48 56 - 0 52 23 0 52 10 0.05 108 0 0 - 0 38 52 19 41 21.6 5 123 -48 - 1 27 55 0 10 10 - 1 31 9 0 13 24 0.04 109 0 0 - 1 17 38 19 41 22.0 7 123 -47 - 2 6 40 - 0 28 36 - 2 9 55 - 0 25 22 0.04 110 0 0 - 1 56 22 19 41 22.4 8 123 -45 - 2 45 24 - 1 7 21 - 2 48 39 - 1 4 7 0.03 111 0 0 - 2 35 4 19 41 22.9 9 123 -44 - 3 24 5 - 1 46 3 - 3 27 20 - 1 42 49 0.03 112 0 0 - 3 13 42 19 41 23.5 10 122 -43 - 4 2 42 - 2 24 43 - 4 5 56 - 2 21 29 0.03 113 0 0 - 3 52 15 19 41 24.2 11 122 -42 - 4 41 13 - 3 3 17 - 4 44 27 - 3 0 3 0.03 114 0 0 - 4 30 41 19 41 24.9 13 122 -41 - 5 19 37 - 3 41 45 - 5 22 51 - 3 38 31 0.02 115 0 0 - 5 8 59 19 41 25.6 14 122 -39 - 5 57 53 - 4 20 6 - 6 1 7 - 4 16 52 0.02 116 0 0 - 5 47 9 19 41 26.5 15 122 -38 - 6 36 0 - 4 58 18 - 6 39 14 - 4 55 4 0.02 117 0 0 - 6 25 8 19 41 27.4 16 122 -37 - 7 13 56 - 5 36 20 - 7 17 9 - 5 33 7 0.02 118 0 0 - 7 2 55 19 41 28.4 17 122 -36 - 7 51 40 - 6 14 11 - 7 54 53 - 6 10 58 0.02 119 0 0 - 7 40 30 19 41 29.4 18 122 -35 - 8 29 11 - 6 51 50 - 8 32 24 - 6 48 37 0.02 120 0 0 - 8 17 51 19 41 30.5 20 122 -34 - 9 6 28 - 7 29 15 - 9 9 41 - 7 26 2 0.02 121 0 0 - 8 54 57 19 41 31.7 21 122 -32 - 9 43 30 - 8 6 25 - 9 46 42 - 8 3 13 0.02 122 0 0 - 9 31 47 19 41 32.9 22 121 -31 -10 20 15 - 8 43 20 -10 23 27 - 8 40 8 0.02 123 0 0 -10 8 20 19 41 34.2 23 121 -30 -10 56 43 - 9 19 58 -10 59 55 - 9 16 46 0.02 124 0 0 -10 44 35 19 41 35.6 24 121 -29 -11 32 52 - 9 56 18 -11 36 4 - 9 53 7 0.02 125 0 0 -11 20 30 19 41 37.0 25 121 -28 -12 8 42 -10 32 19 -12 11 53 -10 29 8 0.02 126 0 0 -11 56 6 19 41 38.4 27 121 -27 -12 44 11 -11 8 0 -12 47 22 -11 4 50 0.02 127 0 0 -12 31 20 19 41 40.0 28 120 -26 -13 19 19 -11 43 20 -13 22 29 -11 40 10 0.02 128 0 0 -13 6 12 19 41 41.5 29 120 -24 -13 54 5 -12 18 19 -13 57 15 -12 15 9 0.02 129 0 0 -13 40 41 19 41 43.1 30 120 -23 -14 28 28 -12 52 55 -14 31 37 -12 49 45 0.02 130 0 0 -14 14 46 19 41 44.8 31 120 -22 -15 2 26 -13 27 7 -15 5 35 -13 23 58 0.02 131 0 0 -14 48 27 19 41 46.5 32 119 -21 -15 36 0 -14 0 55 -15 39 9 -13 57 47 0.01 132 0 0 -15 21 43 19 41 48.3 33 119 -20 -16 9 9 -14 34 18 -16 12 17 -14 31 10 0.01 133 0 0 -15 54 33 19 41 50.1 34 119 -19 -16 41 51 -15 7 15 -16 44 59 -15 4 8 0.01 134 0 0 -16 26 57 19 41 51.9 36 119 -18 -17 14 7 -15 39 46 -17 17 14 -15 36 40 0.01 135 0 0 -16 58 53 19 41 53.8 37 118 -17 -17 45 55 -16 11 50 -17 49 2 -16 8 44 0.01 136 0 0 -17 30 21 19 41 55.7 38 118 -16 -18 17 16 -16 43 27 -18 20 22 -16 40 21 0.01 137 0 0 -18 1 21 19 41 57.7 39 118 -15 -18 48 8 -17 14 35 -18 51 13 -17 11 29 0.01 138 0 0 -18 31 52 19 41 59.6 40 117 -13 -19 18 31 -17 45 14 -19 21 36 -17 42 9 0.01 139 0 0 -19 1 54 19 42 1.7 41 117 -12 -19 48 25 -18 15 24 -19 51 29 -18 12 20 0.01 140 0 0 -19 31 27 19 42 3.7 42 117 -11 -20 17 49 -18 45 5 -20 20 52 -18 42 1 0.01 141 0 0 -20 0 29 19 42 5.8 43 116 -10 -20 46 43 -19 14 15 -20 49 46 -19 11 12 0.01 142 0 0 -20 29 1 19 42 7.9 44 116 -9 -21 15 6 -19 42 56 -21 18 8 -19 39 53 0.01 143 0 0 -20 57 2 19 42 10.1 45 116 -8 -21 42 59 -20 11 5 -21 46 0 -20 8 3 0.01 144 0 0 -21 24 32 19 42 12.2 46 115 -7 -22 10 20 -20 38 44 -22 13 21 -20 35 42 0.01 145 0 0 -21 51 30 19 42 14.4 47 115 -6 -22 37 10 -21 5 51 -22 40 11 -21 2 50 0.01 146 0 0 -22 17 58 19 42 16.7 48 115 -5 -23 3 29 -21 32 26 -23 6 29 -21 29 26 0.01 147 0 0 -22 43 53 19 42 18.9 49 114 -4 -23 29 15 -21 58 30 -23 32 15 -21 55 31 0.01 148 0 0 -23 9 16 19 42 21.2 50 114 -3 -23 54 30 -22 24 2 -23 57 29 -22 21 3 0.01 149 0 0 -23 34 8 19 42 23.4 51 113 -2 -24 19 13 -22 49 2 -24 22 12 -22 46 4 0.01 150 0 0 -23 58 27 19 42 25.7 52 113 -1 -24 43 24 -23 13 30 -24 46 22 -23 10 32 0.01 151 0 0 -24 22 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52 -29 35 24 0.01 -136 0 0 -30 7 22 19 45 25.0 62 256 64 -30 49 54 -29 24 51 -30 52 42 -29 22 2 0.01 -135 0 0 -29 53 35 19 45 27.3 61 256 65 -30 36 13 -29 10 58 -30 39 2 -29 8 9 0.01 -134 0 0 -29 39 17 19 45 29.5 60 255 66 -30 22 1 -28 56 33 -30 24 50 -28 53 44 0.01 -133 0 0 -29 24 27 19 45 31.8 59 255 66 -30 7 17 -28 41 37 -30 10 7 -28 38 48 0.01 -132 0 0 -29 9 6 19 45 34.1 58 254 67 -29 52 3 -28 26 10 -29 54 53 -28 23 20 0.01 -131 0 0 -28 53 13 19 45 36.3 57 254 68 -29 36 17 -28 10 10 -29 39 7 -28 7 20 0.01 -130 0 0 -28 36 49 19 45 38.6 56 253 69 -29 19 59 -27 53 39 -29 22 50 -27 50 48 0.01 -129 0 0 -28 19 52 19 45 40.8 55 253 70 -29 3 10 -27 36 35 -29 6 1 -27 33 44 0.01 -128 0 0 -28 2 24 19 45 43.0 54 252 71 -28 45 48 -27 19 0 -28 48 40 -27 16 8 0.01 -127 0 0 -27 44 24 19 45 45.2 53 252 72 -28 27 55 -27 0 52 -28 30 48 -26 58 0 0.01 -126 0 0 -27 25 51 19 45 47.4 52 251 73 -28 9 30 -26 42 12 -28 12 23 -26 39 20 0.01 -125 0 0 -27 6 47 19 45 49.6 51 251 73 -27 50 33 -26 23 0 -27 53 27 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31 0.02 -100 0 0 -16 17 40 19 46 35.7 26 241 77 -17 4 51 -15 30 29 -17 7 58 -15 27 22 0.02 - 99 0 0 -15 45 13 19 46 37.0 25 241 76 -16 32 32 -14 57 54 -16 35 39 -14 54 47 0.02 - 98 0 0 -15 12 19 19 46 38.3 24 241 75 -15 59 45 -14 24 53 -16 2 53 -14 21 45 0.02 - 97 0 0 -14 39 0 19 46 39.6 22 240 74 -15 26 33 -13 51 27 -15 29 42 -13 48 19 0.02 - 96 0 0 -14 5 16 19 46 40.8 21 240 73 -14 52 57 -13 17 36 -14 56 5 -13 14 27 0.02 - 95 0 0 -13 31 8 19 46 42.0 20 240 72 -14 18 55 -12 43 21 -14 22 4 -12 40 12 0.02 - 94 0 0 -12 56 37 19 46 43.1 19 240 71 -13 44 30 -12 8 43 -13 47 40 -12 5 34 0.02 - 93 0 0 -12 21 43 19 46 44.1 18 239 70 -13 9 43 -11 33 43 -13 12 53 -11 30 33 0.02 - 92 0 0 -11 46 27 19 46 45.1 17 239 69 -12 34 33 -10 58 22 -12 37 44 -10 55 11 0.02 - 91 0 0 -11 10 51 19 46 46.1 16 239 68 -11 59 3 -10 22 40 -12 2 14 -10 19 29 0.02 - 90 0 0 -10 34 55 19 46 46.9 15 239 67 -11 23 12 - 9 46 38 -11 26 24 - 9 43 27 0.02 - 89 0 0 - 9 58 40 19 46 47.7 13 239 66 -10 47 3 - 9 10 18 -10 50 14 - 9 7 7 0.02 - 88 0 0 - 9 22 8 19 46 48.5 12 239 65 -10 10 35 - 8 33 41 -10 13 47 - 8 30 29 0.03 - 87 0 0 - 8 45 18 19 46 49.2 11 238 64 - 9 33 50 - 7 56 47 - 9 37 3 - 7 53 35 0.03 - 86 0 0 - 8 8 13 19 46 49.8 10 238 63 - 8 56 50 - 7 19 37 - 9 0 2 - 7 16 25 0.03 - 85 0 0 - 7 30 54 19 46 50.3 9 238 61 - 8 19 34 - 6 42 14 - 8 22 47 - 6 39 1 0.03 - 84 0 0 - 6 53 21 19 46 50.8 8 238 60 - 7 42 4 - 6 4 37 - 7 45 17 - 6 1 24 0.04 - 83 0 0 - 6 15 35 19 46 51.2 6 238 59 - 7 4 22 - 5 26 48 - 7 7 36 - 5 23 35 0.04 - 82 0 0 - 5 37 39 19 46 51.5 5 238 58 - 6 26 29 - 4 48 49 - 6 29 42 - 4 45 36 0.05 - 81 0 0 - 4 59 32 19 46 51.8 4 238 57 - 5 48 25 - 4 10 40 - 5 51 39 - 4 7 27 0.06 - 80 0 0 - 4 21 17 19 46 52.0 3 238 56 - 5 10 12 - 3 32 23 - 5 13 26 - 3 29 9 0.08 - 79 0 0 - 3 42 55 19 46 52.2 2 237 55 - 4 31 52 - 2 53 58 - 4 35 5 - 2 50 45 0.12 - 78 0 0 - 3 4 26 19 46 52.2 0 237 53 - 3 53 24 .. .. .. - 3 56 38 .. .. .. 0.43 Uncertainty in time = +/- 1 secs Prediction of 2022 Dec 13.0 Data for the target star ------------------------ * name: HIP 86650 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 42 16.8132 DE: -32 31 23.248 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 42 16.8135 DE: -32 31 23.248 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 7.8 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (54) Alexandra asteroid class: approx. diameter [km]: 152 approx. diameter ["]: 0.076 distance from Earth [AU]: 2.77230 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#192 date of fit: 2022 Nov 25 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", 0.001", 83.916° remarks: * orbital elements for (54)Alexandra : Mean anomaly = 323.5220451864 deg Arg. of pericenter = 345.2644917342 deg Long. of node = 313.2324008119 deg Inclination = 11.7963944259 deg Eccentricity = 0.1968162177 Semimajor axis = 2.7110218009 AU Perihelion dist = 2.1774487438 AU Mag: H = 7.87, G = 0.15 Epoch of elements : MJD 59983.82229167 TDT (2023 Feb 08.8223) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1922022Nov25,3.95,2023,2,8,19.735133,-0.000760,-0.005410,21.699615,-1.149571,-0.004566,-0.000415,-0.000001,0.000000 -168.7404,-32.5338,-112.49,-14.88,False HIP 86650,17.70467027,-32.5231247,0.00,7.77,0.00,0.0,0,,17.72938372,-32.5337918,5.17,0.00,0,0,0 54,Alexandra,12.93,152.1,2.7723,0,0,5.444,-3.64,,7.6,0 0,323.3405,2023,2,8,345.2645,313.2324,11.7964,0.19682,2.71102,2.17745,7.88,5.0,0.15 1.033,0.0150,0.0008,84,0.0025,Known errors,-1.00,-1,-1,-1 20230208__86650,59926.02 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 13, 00:25 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org