IOTA/IOTA-ES occultation update for (146) Lucina / UCAC4 320-112250 event on 2023 Jul 12, 22:22 UT Visible from Africa, South America Summary ------- On 2023 Jul 12 UT, the 137.2 km diameter asteroid (146) Lucina will occult a 11.6 mag star in the constellation Ophiuchus for observers along a path across Africa, South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.16 mag to 12.25 mag (the magnitude of the asteroid) for at most 16.800 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 Jul 12, 22:09 - 2023 Jul 12, 22:35 * geocentric midpoint of event [JD]: 2460138.43244367 * magnitude of target star: 11.55 * magnitude drop [mag]: 1.16 * estimated maximum duration [s]: 16.800 * Moon: 21 % sunlit, 154° distance * Sun: 151° distance * rough path description: Africa, South America The occultation path -------------------- * approximate projected width [km]: 140 * 1 sigma uncertainty interval [path widths]: +/- 0.16 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.026, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.006", 109°) * approx speed of asteroid's shadow [km/s]: 8.1665 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 320-112250 by 146 Lucina on 2023 Jul 12 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 -10 56 12 22 35 29.3 1 116 28 -10 13 36 -11 38 39 - 9 59 53 -11 52 17 .... -103 0 0 -11 25 12 22 35 28.9 2 116 27 -10 42 47 -12 7 30 -10 29 7 -12 21 5 -0.06 -102 0 0 -11 53 37 22 35 28.4 3 116 26 -11 11 21 -12 35 45 -10 57 44 -12 49 16 -0.13 -101 0 0 -12 21 24 22 35 27.5 4 116 25 -11 39 18 -13 3 23 -11 25 44 -13 16 51 -0.15 -100 0 0 -12 48 35 22 35 26.4 5 116 24 -12 6 39 -13 30 24 -11 53 8 -13 43 50 -0.17 - 99 0 0 -13 15 10 22 35 25.0 6 115 23 -12 33 23 -13 56 49 -12 19 55 -14 10 12 -0.18 - 98 0 0 -13 41 7 22 35 23.3 7 115 22 -12 59 30 -14 22 38 -12 46 5 -14 35 57 -0.19 - 97 0 0 -14 6 28 22 35 21.4 8 115 21 -13 25 0 -14 47 50 -13 11 38 -15 1 6 -0.19 - 96 0 0 -14 31 13 22 35 19.2 9 115 20 -13 49 53 -15 12 25 -13 36 34 -15 25 39 -0.19 - 95 0 0 -14 55 20 22 35 16.8 10 114 19 -14 14 9 -15 36 24 -14 0 53 -15 49 35 -0.20 - 94 0 0 -15 18 51 22 35 14.1 11 114 18 -14 37 49 -15 59 46 -14 24 36 -16 12 54 -0.20 - 93 0 0 -15 41 46 22 35 11.2 12 114 17 -15 0 52 -16 22 33 -14 47 42 -16 35 38 -0.20 - 92 0 0 -16 4 4 22 35 8.1 13 114 16 -15 23 19 -16 44 43 -15 10 11 -16 57 45 -0.20 - 91 0 0 -16 25 46 22 35 4.8 14 113 15 -15 45 9 -17 6 17 -15 32 4 -17 19 17 -0.20 - 90 0 0 -16 46 52 22 35 1.2 15 113 14 -16 6 23 -17 27 15 -15 53 21 -17 40 12 -0.20 - 89 0 0 -17 7 22 22 34 57.4 16 113 13 -16 27 1 -17 47 37 -16 14 1 -18 0 32 -0.20 - 88 0 0 -17 27 17 22 34 53.4 17 113 12 -16 47 3 -18 7 24 -16 34 6 -18 20 16 -0.20 - 87 0 0 -17 46 35 22 34 49.2 18 112 11 -17 6 29 -18 26 35 -16 53 34 -18 39 25 -0.20 - 86 0 0 -18 5 18 22 34 44.8 19 112 10 -17 25 19 -18 45 11 -17 12 27 -18 57 59 -0.20 - 85 0 0 -18 23 26 22 34 40.3 20 112 9 -17 43 34 -19 3 11 -17 30 44 -19 15 57 -0.20 - 84 0 0 -18 40 58 22 34 35.5 21 112 8 -18 1 14 -19 20 37 -17 48 25 -19 33 21 -0.20 - 83 0 0 -18 57 56 22 34 30.5 22 111 7 -18 18 18 -19 37 28 -18 5 32 -19 50 10 -0.20 - 82 0 0 -19 14 19 22 34 25.3 23 111 6 -18 34 47 -19 53 44 -18 22 3 -20 6 24 -0.20 - 81 0 0 -19 30 7 22 34 20.0 24 111 5 -18 50 41 -20 9 26 -18 37 59 -20 22 4 -0.20 - 80 0 0 -19 45 20 22 34 14.5 25 110 4 -19 6 1 -20 24 34 -18 53 21 -20 37 9 -0.20 - 79 0 0 -20 0 0 22 34 8.8 26 110 3 -19 20 46 -20 39 7 -19 8 8 -20 51 41 -0.20 - 78 0 0 -20 14 5 22 34 3.0 27 110 2 -19 34 57 -20 53 7 -19 22 21 -21 5 39 -0.20 - 77 0 0 -20 27 36 22 33 57.0 28 110 1 -19 48 34 -21 6 33 -19 35 59 -21 19 3 -0.20 - 76 0 0 -20 40 34 22 33 50.8 29 109 0 -20 1 37 -21 19 26 -19 49 4 -21 31 54 -0.20 - 75 0 0 -20 52 58 22 33 44.5 30 109 -1 -20 14 6 -21 31 45 -20 1 35 -21 44 12 -0.20 - 74 0 0 -21 4 49 22 33 38.0 31 109 -2 -20 26 1 -21 43 31 -20 13 32 -21 55 56 -0.20 - 73 0 0 -21 16 6 22 33 31.3 31 108 -2 -20 37 23 -21 54 43 -20 24 55 -22 7 7 -0.20 - 72 0 0 -21 26 51 22 33 24.5 32 108 -3 -20 48 12 -22 5 24 -20 35 46 -22 17 46 -0.20 - 71 0 0 -21 37 2 22 33 17.6 33 108 -4 -20 58 28 -22 15 31 -20 46 3 -22 27 52 -0.20 - 70 0 0 -21 46 41 22 33 10.5 34 108 -5 -21 8 11 -22 25 6 -20 55 47 -22 37 26 -0.20 - 69 0 0 -21 55 47 22 33 3.3 35 107 -6 -21 17 21 -22 34 9 -21 4 58 -22 46 27 -0.20 - 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Uncertainty in time = +/- 4 secs Prediction of 2023 May 14.2 Data for the target star ------------------------ * name: UCAC4 320-112250 * constellation : Ophiuchus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 19 15.6849 DE: -26 01 16.919 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 19 15.6848 DE: -26 01 16.919 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (146) Lucina asteroid class: approx. diameter [km]: 137 approx. diameter ["]: 0.115 distance from Earth [AU]: 1.64600 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#117 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): 0.027", 0.006", 108.557° remarks: * orbital elements for (146)Lucina : Mean anomaly = 37.8282222070 deg Arg. of pericenter = 145.4034192361 deg Long. of node = 83.9296640905 deg Inclination = 13.0992682137 deg Eccentricity = 0.0661202110 Semimajor axis = 2.7181203580 AU Perihelion dist = 2.5383976663 AU Mag: H = 8.41, G = 0.11 Epoch of elements : MJD 60137.93229167 TDT (2023 Jul 12.9323) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1172023Apr24,16.80,2023,7,12,22.378648,-0.075983,0.178775,-4.241903,-1.803534,0.002662,0.000062,0.000001,0.000000 -6.0498,-26.0465,-154.25,21.90,False UCAC4 320-112250,17.32102358,-26.0213663,0.00,11.55,0.00,0.0,0,,17.34551011,-26.0464845,1.16,0.00,0,0,0 146,Lucina,12.25,137.2,1.6460,0,0,-1.680,-9.63,,7.6,0 0,37.6232,2023,7,12,145.4034,83.9297,13.0993,0.06612,2.71812,2.53840,8.42,5.0,0.15 1.161,0.0270,0.0060,109,0.0185,Known errors,-1.00,-1,-1,-1 20230712_112250,60078.17 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 14, 04:01 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org