IOTA/IOTA-ES occultation update for (1005) Arago / UCAC4 207-139210 event on 2023 May 17, 02:50 UT Visible from S Africa Summary ------- On 2023 May 17 UT, the 59.1 km diameter asteroid (1005) Arago will occult a 12.2 mag star in the constellation Ara for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.36 mag to 15.49 mag (the magnitude of the asteroid) for at most 4.700 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 May 17, 02:42 - 2023 May 17, 02:59 * geocentric midpoint of event [JD]: 2460081.61847275 * magnitude of target star: 12.18 * magnitude drop [mag]: 3.36 * estimated maximum duration [s]: 4.700 * Moon: 7 % sunlit, 119° distance * Sun: 144° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 59 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.022", 0.006", 92°) * approx speed of asteroid's shadow [km/s]: 12.5625 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 207-139210 by 1005 Arago on 2023 May 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 -130 0 0 -17 34 37 2 59 1.1 1 142 -11 -17 8 45 -18 0 30 -16 52 21 -18 16 57 .... -129 0 0 -18 46 50 2 59 0.7 2 141 -12 -18 21 5 -19 12 36 -18 4 45 -19 28 57 0.12 -128 0 0 -19 57 58 2 58 59.9 4 141 -13 -19 32 21 -20 23 37 -19 16 6 -20 39 54 0.10 -127 0 0 -21 7 59 2 58 58.8 5 141 -15 -20 42 31 -21 33 30 -20 26 21 -21 49 41 0.09 -126 0 0 -22 16 50 2 58 57.4 7 140 -16 -21 51 30 -22 42 12 -21 35 26 -22 58 18 0.09 -125 0 0 -23 24 28 2 58 55.6 8 140 -17 -22 59 17 -23 49 41 -22 43 19 -24 5 41 0.09 -124 0 0 -24 30 50 2 58 53.6 10 139 -18 -24 5 49 -24 55 53 -23 49 57 -25 11 47 0.08 -123 0 0 -25 35 55 2 58 51.3 11 139 -19 -25 11 4 -26 0 48 -24 55 18 -26 16 36 0.08 -122 0 0 -26 39 41 2 58 48.7 13 139 -20 -26 15 0 -27 4 23 -25 59 20 -27 20 5 0.08 -121 0 0 -27 42 6 2 58 45.9 14 138 -21 -27 17 35 -28 6 38 -27 2 2 -28 22 13 0.08 -120 0 0 -28 43 9 2 58 42.9 15 138 -22 -28 18 49 -29 7 30 -28 3 23 -29 22 58 0.08 -119 0 0 -29 42 50 2 58 39.7 17 137 -23 -29 18 41 -30 7 0 -29 3 22 -30 22 21 0.08 -118 0 0 -30 41 8 2 58 36.2 18 137 -24 -30 17 11 -31 5 7 -30 1 59 -31 20 21 0.08 -117 0 0 -31 38 3 2 58 32.6 19 136 -25 -31 14 17 -32 1 51 -30 59 12 -32 16 57 0.08 -116 0 0 -32 33 35 2 58 28.8 20 136 -26 -32 10 0 -32 57 11 -31 55 3 -33 12 10 0.08 -115 0 0 -33 27 44 2 58 24.9 22 135 -27 -33 4 20 -33 51 8 -32 49 30 -34 6 0 0.08 -114 0 0 -34 20 30 2 58 20.9 23 134 -28 -33 57 18 -34 43 42 -33 42 35 -34 58 27 0.08 -113 0 0 -35 11 53 2 58 16.7 24 134 -29 -34 48 53 -35 34 54 -34 34 18 -35 49 31 0.08 -112 0 0 -36 1 56 2 58 12.4 25 133 -30 -35 39 7 -36 24 45 -35 24 40 -36 39 15 0.08 -111 0 0 -36 50 38 2 58 8.0 26 133 -31 -36 28 1 -37 13 15 -36 13 41 -37 27 38 0.08 -110 0 0 -37 38 0 2 58 3.5 27 132 -31 -37 15 35 -38 0 26 -37 1 22 -38 14 41 0.08 -109 0 0 -38 24 3 2 57 59.0 28 131 -32 -38 1 50 -38 46 18 -37 47 44 -39 0 25 0.08 -108 0 0 -39 8 50 2 57 54.3 30 131 -33 -38 46 48 -39 30 53 -38 32 49 -39 44 53 0.08 -107 0 0 -39 52 20 2 57 49.6 31 130 -34 -39 30 29 -40 14 11 -39 16 38 -40 28 4 0.08 -106 0 0 -40 34 35 2 57 44.9 32 129 -34 -40 12 55 -40 56 15 -39 59 12 -41 10 0 0.08 -105 0 0 -41 15 36 2 57 40.1 33 129 -35 -40 54 8 -41 37 5 -40 40 31 -41 50 44 0.08 -104 0 0 -41 55 25 2 57 35.3 34 128 -36 -41 34 9 -42 16 43 -41 20 39 -42 30 15 0.08 -103 0 0 -42 34 4 2 57 30.4 35 127 -36 -42 12 58 -42 55 11 -41 59 35 -43 8 35 0.08 -102 0 0 -43 11 33 2 57 25.5 35 127 -37 -42 50 38 -43 32 29 -42 37 22 -43 45 47 0.08 -101 0 0 -43 47 55 2 57 20.6 36 126 -38 -43 27 10 -44 8 40 -43 14 1 -44 21 51 0.08 -100 0 0 -44 23 10 2 57 15.7 37 125 -38 -44 2 36 -44 43 44 -43 49 33 -44 56 48 0.09 - 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9 56 3 -10 47 39 - 9 39 41 -11 4 2 0.08 47 0 0 - 9 7 0 2 42 55.1 24 220 -4 - 8 41 11 - 9 32 50 - 8 24 48 - 9 49 15 0.08 48 0 0 - 7 51 47 2 42 49.5 23 220 -3 - 7 25 57 - 8 17 39 - 7 9 34 - 8 34 4 0.08 49 0 0 - 6 36 17 2 42 44.3 21 220 -2 - 6 10 26 - 7 2 9 - 5 54 3 - 7 18 35 0.08 50 0 0 - 5 20 35 2 42 39.4 19 220 0 - 4 54 45 - 5 46 27 - 4 38 22 - 6 2 52 0.08 51 0 0 - 4 4 47 2 42 34.9 18 220 1 - 3 38 58 - 4 30 38 - 3 22 35 - 4 47 3 0.08 52 0 0 - 2 48 58 2 42 30.8 16 220 2 - 2 23 11 - 3 14 47 - 2 6 49 - 3 31 11 0.08 53 0 0 - 1 33 15 2 42 27.0 15 220 4 - 1 7 29 - 1 59 1 - 0 51 9 - 2 15 23 0.08 54 0 0 - 0 17 41 2 42 23.6 13 220 5 0 8 1 - 0 43 25 0 24 19 - 0 59 45 0.09 55 0 0 0 57 36 2 42 20.6 11 220 6 1 23 15 0 31 57 1 39 30 0 15 39 0.09 56 0 0 2 12 32 2 42 18.0 10 220 8 2 38 6 1 46 57 2 54 19 1 30 42 0.09 57 0 0 3 27 1 2 42 15.8 8 220 9 3 52 30 3 1 31 4 8 39 2 45 19 0.10 58 0 0 4 40 58 2 42 14.0 7 220 10 5 6 21 4 15 34 5 22 26 3 59 26 0.10 59 0 0 5 54 17 2 42 12.6 5 220 12 6 19 34 5 29 0 6 35 36 5 12 56 0.11 60 0 0 7 6 55 2 42 11.6 4 220 13 7 32 5 6 41 45 7 48 2 6 25 45 0.13 61 0 0 8 18 47 2 42 10.9 2 220 14 8 43 49 7 53 43 8 59 41 7 37 49 0.19 62 0 0 9 29 47 2 42 10.6 0 220 16 9 54 41 9 4 52 .. .. .. 8 49 3 0.58 Uncertainty in time = +/- 3 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 207-139210 * constellation : Ara * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 13 10.9985 DE: -48 45 02.215 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 13 10.9986 DE: -48 45 02.216 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1005) Arago asteroid class: approx. diameter [km]: 59 approx. diameter ["]: 0.031 distance from Earth [AU]: 2.63090 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#60 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): 0.022", 0.006", 92.185° remarks: * orbital elements for (1005)Arago : Mean anomaly = 210.3951377172 deg Arg. of pericenter = 60.7129635224 deg Long. of node = 349.1333767508 deg Inclination = 19.0602563387 deg Eccentricity = 0.1195190679 Semimajor axis = 3.1653443428 AU Perihelion dist = 2.7870253373 AU Mag: H = 10.02, G = 0.15 Epoch of elements : MJD 60081.11840278 TDT (2023 May 17.1184) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#602023Apr24,4.70,2023,5,17,2.843346,0.033125,-0.089403,-6.645379,-2.473051,-0.002330,0.002460,0.000001,0.000000 -18.4596,-48.7777,136.45,19.25,False UCAC4 207-139210,17.21972180,-48.7506152,0.00,12.18,0.00,0.0,0,,17.24960650,-48.7776956,3.36,0.00,0,0,0 1005,Arago,15.49,59.1,2.6309,0,0,-2.247,-8.26,,4.0,0 0,210.3744,2023,5,17,60.7130,349.1334,19.0603,0.11952,3.16534,2.78703,10.03,5.0,0.15 1.317,0.0217,0.0057,92,0.0098,Known errors,-1.00,-1,-1,-1 20230517_139210,60063.19 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:27 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org