IOTA/IOTA-ES occultation update for (1581) Abanderada / UCAC4 345-097119 event on 2023 May 16, 13:14 UT Visible from Australia Summary ------- On 2023 May 16 UT, the 34.1 km diameter asteroid (1581) Abanderada will occult a 12.2 mag star in the constellation Ophiuchus 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 3.31 mag to 15.48 mag (the magnitude of the asteroid) for at most 3.830 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 16, 13:02 - 2023 May 16, 13:26 * geocentric midpoint of event [JD]: 2460081.05157225 * magnitude of target star: 12.22 * magnitude drop [mag]: 3.31 * estimated maximum duration [s]: 3.830 * Moon: 11 % sunlit, 115° distance * Sun: 154° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 35 * 1 sigma uncertainty interval [path widths]: +/- 0.19 * 1 sigma uncertainty interval [seconds]: +/- 4.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.030, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.031", 0.004", 97°) * approx speed of asteroid's shadow [km/s]: 8.9062 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 345-097119 by 1581 Abanderada on 2023 May 16 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 92 0 0 - 7 49 57 13 26 0.9 0 111 -26 - 7 39 54 - 8 0 0 - 7 36 6 - 8 3 49 .... 93 0 0 - 8 13 18 13 26 0.7 1 111 -27 - 8 3 15 - 8 23 22 - 7 59 27 - 8 27 10 0.20 94 0 0 - 8 36 41 13 26 0.3 2 111 -28 - 8 26 37 - 8 46 44 - 8 22 49 - 8 50 33 0.18 95 0 0 - 9 0 3 13 25 59.6 3 111 -29 - 8 49 59 - 9 10 6 - 8 46 11 - 9 13 55 0.17 96 0 0 - 9 23 24 13 25 58.7 4 111 -30 - 9 13 21 - 9 33 28 - 9 9 33 - 9 37 16 0.17 97 0 0 - 9 46 44 13 25 57.6 5 111 -31 - 9 36 41 - 9 56 48 - 9 32 53 -10 0 37 0.17 98 0 0 -10 10 3 13 25 56.2 7 110 -32 -10 0 0 -10 20 7 - 9 56 11 -10 23 55 0.17 99 0 0 -10 33 19 13 25 54.5 8 110 -33 -10 23 16 -10 43 23 -10 19 28 -10 47 11 0.16 100 0 0 -10 56 33 13 25 52.6 9 110 -34 -10 46 29 -11 6 36 -10 42 41 -11 10 24 0.16 101 0 0 -11 19 43 13 25 50.5 10 110 -35 -11 9 39 -11 29 46 -11 5 51 -11 33 34 0.16 102 0 0 -11 42 49 13 25 48.2 11 110 -36 -11 32 46 -11 52 52 -11 28 58 -11 56 40 0.16 103 0 0 -12 5 51 13 25 45.6 12 109 -37 -11 55 48 -12 15 54 -11 52 0 -12 19 42 0.16 104 0 0 -12 28 48 13 25 42.8 13 109 -38 -12 18 45 -12 38 51 -12 14 57 -12 42 39 0.16 105 0 0 -12 51 39 13 25 39.8 14 109 -39 -12 41 37 -13 1 42 -12 37 49 -13 5 30 0.16 106 0 0 -13 14 25 13 25 36.5 15 109 -40 -13 4 23 -13 24 27 -13 0 35 -13 28 15 0.16 107 0 0 -13 37 4 13 25 33.1 16 108 -41 -13 27 2 -13 47 7 -13 23 15 -13 50 55 0.16 108 0 0 -13 59 37 13 25 29.4 17 108 -42 -13 49 35 -14 9 39 -13 45 48 -14 13 27 0.16 109 0 0 -14 22 2 13 25 25.5 18 108 -43 -14 12 1 -14 32 4 -14 8 13 -14 35 52 0.16 110 0 0 -14 44 20 13 25 21.4 19 108 -44 -14 34 19 -14 54 21 -14 30 31 -14 58 9 0.16 111 0 0 -15 6 29 13 25 17.1 20 107 -45 -14 56 28 -15 16 30 -14 52 41 -15 20 18 0.16 112 0 0 -15 28 30 13 25 12.6 21 107 -46 -15 18 30 -15 38 31 -15 14 43 -15 42 18 0.16 113 0 0 -15 50 22 13 25 7.9 22 107 -47 -15 40 22 -16 0 22 -15 36 35 -16 4 10 0.16 114 0 0 -16 12 4 13 25 3.0 23 107 -48 -16 2 5 -16 22 4 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29 -20 31 45 0.16 127 0 0 -20 37 15 13 23 43.5 36 102 -61 -20 27 22 -20 47 8 -20 23 37 -20 50 52 0.16 128 0 0 -20 56 9 13 23 36.3 37 101 -62 -20 46 16 -21 6 1 -20 42 32 -21 9 45 0.17 129 0 0 -21 14 48 13 23 29.0 38 101 -62 -21 4 57 -21 24 40 -21 1 13 -21 28 24 0.17 130 0 0 -21 33 14 13 23 21.5 39 100 -63 -21 23 23 -21 43 5 -21 19 39 -21 46 49 0.17 131 0 0 -21 51 24 13 23 13.9 39 100 -64 -21 41 34 -22 1 15 -21 37 51 -22 4 59 0.17 132 0 0 -22 9 20 13 23 6.2 40 100 -65 -21 59 30 -22 19 10 -21 55 47 -22 22 53 0.17 133 0 0 -22 27 1 13 22 58.4 41 99 -66 -22 17 12 -22 36 50 -22 13 29 -22 40 33 0.17 134 0 0 -22 44 26 13 22 50.4 42 99 -67 -22 34 37 -22 54 15 -22 30 55 -22 57 58 0.17 135 0 0 -23 1 36 13 22 42.3 43 98 -68 -22 51 48 -23 11 24 -22 48 6 -23 15 6 0.17 136 0 0 -23 18 30 13 22 34.2 44 98 -69 -23 8 43 -23 28 17 -23 5 1 -23 32 0 0.17 137 0 0 -23 35 8 13 22 25.9 45 97 -69 -23 25 22 -23 44 55 -23 21 40 -23 48 37 0.17 138 0 0 -23 51 30 13 22 17.5 46 96 -70 -23 41 45 -24 1 17 -23 38 3 -24 4 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11 0.17 - 88 0 0 -15 59 35 13 2 50.9 14 252 12 -15 49 35 -16 9 36 -15 45 48 -16 13 23 0.17 - 87 0 0 -15 37 37 13 2 47.9 12 251 13 -15 27 36 -15 47 38 -15 23 49 -15 51 25 0.18 - 86 0 0 -15 15 29 13 2 45.2 11 251 14 -15 5 28 -15 25 30 -15 1 40 -15 29 18 0.18 - 85 0 0 -14 53 12 13 2 42.8 10 251 15 -14 43 11 -15 3 14 -14 39 23 -15 7 2 0.18 - 84 0 0 -14 30 47 13 2 40.5 9 250 16 -14 20 45 -14 40 49 -14 16 57 -14 44 37 0.18 - 83 0 0 -14 8 13 13 2 38.5 8 250 17 -13 58 11 -14 18 16 -13 54 23 -14 22 4 0.18 - 82 0 0 -13 45 32 13 2 36.7 7 250 18 -13 35 30 -13 55 35 -13 31 42 -13 59 23 0.19 - 81 0 0 -13 22 44 13 2 35.1 6 250 19 -13 12 41 -13 32 47 -13 8 53 -13 36 35 0.19 - 80 0 0 -12 59 49 13 2 33.7 5 250 20 -12 49 46 -13 9 52 -12 45 58 -13 13 41 0.20 - 79 0 0 -12 36 48 13 2 32.6 4 249 21 -12 26 45 -12 46 51 -12 22 56 -12 50 40 0.21 - 78 0 0 -12 13 41 13 2 31.8 3 249 22 -12 3 38 -12 23 45 -11 59 49 -12 27 33 0.23 - 77 0 0 -11 50 29 13 2 31.1 2 249 23 -11 40 25 -12 0 33 -11 36 37 -12 4 21 0.26 - 76 0 0 -11 27 12 13 2 30.7 1 249 24 -11 17 8 -11 37 16 -11 13 20 -11 41 5 0.36 - 75 0 0 -11 3 51 13 2 30.6 0 248 25 .. .. .. -11 13 55 .. .. .. -11 17 44 5.36 Uncertainty in time = +/- 5 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 345-097119 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 20 01.8712 DE: -21 05 15.400 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 20 01.8712 DE: -21 05 15.400 * 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: (1581) Abanderada asteroid class: approx. diameter [km]: 34 approx. diameter ["]: 0.024 distance from Earth [AU]: 1.97470 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#55 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): 0.031", 0.004", 96.668° remarks: * orbital elements for (1581)Abanderada : Mean anomaly = 46.3797742367 deg Arg. of pericenter = 89.5721403556 deg Long. of node = 104.8012667711 deg Inclination = 2.5388862245 deg Eccentricity = 0.1226926930 Semimajor axis = 3.1581667067 AU Perihelion dist = 2.7706827284 AU Mag: H = 11.07, G = 0.15 Epoch of elements : MJD 60080.55152778 TDT (2023 May 16.5515) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#552023Apr24,3.83,2023,5,16,13.237734,-0.005388,-0.174059,-5.024591,0.153271,-0.002477,-0.000015,0.000001,0.000000 -172.2019,-21.1121,-19.47,19.12,False UCAC4 345-097119,17.33385310,-21.0876111,0.00,12.22,0.00,0.0,0,,17.35725825,-21.1121042,3.32,0.00,0,0,1 1581,Abanderada,15.48,34.1,1.9747,0,0,-1.599,0.68,,1.8,0 0,46.2829,2023,5,16,89.5721,104.8013,2.5389,0.12269,3.15817,2.77068,11.09,5.0,0.15 1.189,0.0307,0.0037,97,0.0045,Known errors,-1.00,-1,-1,-1 20230516_097119,60063.19 ------ 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