IOTA/IOTA-ES occultation update for (336) Lacadiera / UCAC4 345-073636 event on 2023 Apr 03, 17:26 UT Visible from Australia Summary ------- On 2023 Apr 03 UT, the 69.7 km diameter asteroid (336) Lacadiera will occult a 12.5 mag star in the constellation Libra 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 0.94 mag to 12.80 mag (the magnitude of the asteroid) for at most 20.300 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 Apr 03, 16:55 - 2023 Apr 03, 17:57 * geocentric midpoint of event [JD]: 2460038.22652521 * magnitude of target star: 12.45 * magnitude drop [mag]: 0.94 * estimated maximum duration [s]: 20.300 * Moon: 94 % sunlit, 64° distance * Sun: 144° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 72 * 1 sigma uncertainty interval [path widths]: +/- 0.13 * 1 sigma uncertainty interval [seconds]: +/- 5.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.022, +/- 0.005) * 1 sigma uncertainty ellipse (major, minor, PA): (0.023", 0.003", 99°) * approx speed of asteroid's shadow [km/s]: 3.4329 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 345-073636 by 336 Lacadiera on 2023 Apr 3 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 44 0 0 20 30 43 17 56 20.0 0 113 -36 20 51 32 20 9 53 20 56 53 20 4 31 .... 45 0 0 20 6 32 17 56 19.4 1 113 -38 20 27 25 19 45 37 20 32 47 19 40 14 0.20 46 0 0 19 41 40 17 56 18.3 2 113 -39 20 2 38 19 20 40 20 8 1 19 15 15 0.19 47 0 0 19 16 7 17 56 16.6 3 114 -40 19 37 10 18 55 3 19 42 35 18 49 37 0.19 48 0 0 18 49 54 17 56 14.2 5 114 -41 19 11 2 18 28 45 19 16 28 18 23 18 0.19 49 0 0 18 23 1 17 56 11.3 6 114 -42 18 44 14 18 1 47 18 49 41 17 56 18 0.18 50 0 0 17 55 28 17 56 7.6 7 115 -43 18 16 46 17 34 9 18 22 14 17 28 39 0.18 51 0 0 17 27 15 17 56 3.4 8 115 -44 17 48 38 17 5 51 17 54 8 17 0 20 0.18 52 0 0 16 58 23 17 55 58.4 9 115 -45 17 19 51 16 36 54 17 25 22 16 31 22 0.18 53 0 0 16 28 52 17 55 52.9 10 116 -46 16 50 25 16 7 18 16 55 58 16 1 44 0.18 54 0 0 15 58 42 17 55 46.6 11 116 -47 16 20 20 15 37 3 16 25 54 15 31 28 0.18 55 0 0 15 27 54 17 55 39.7 12 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15 39 7 30 3 8 21 30 7 24 11 0.17 69 0 0 7 14 3 17 52 49.7 27 118 -63 7 36 54 6 51 10 7 42 47 6 45 16 0.17 70 0 0 6 34 45 17 52 32.3 28 118 -64 6 57 40 6 11 47 7 3 34 6 5 52 0.17 71 0 0 5 54 59 17 52 14.2 29 118 -66 6 17 59 5 31 57 6 23 54 5 26 1 0.17 72 0 0 5 14 46 17 51 55.4 31 118 -67 5 37 51 4 51 40 5 43 47 4 45 43 0.17 73 0 0 4 34 8 17 51 35.9 32 118 -68 4 57 16 4 10 57 5 3 14 4 4 59 0.17 74 0 0 3 53 4 17 51 15.7 33 118 -69 4 16 17 3 29 50 4 22 15 3 23 50 0.17 75 0 0 3 11 37 17 50 54.9 34 118 -70 3 34 54 2 48 19 3 40 53 2 42 18 0.17 76 0 0 2 29 48 17 50 33.4 35 118 -71 2 53 8 2 6 25 2 59 9 2 0 24 0.17 77 0 0 1 47 37 17 50 11.2 36 118 -72 2 11 1 1 24 10 2 17 2 1 18 8 0.17 78 0 0 1 5 5 17 49 48.4 37 118 -73 1 28 33 0 41 35 1 34 35 0 35 32 0.17 79 0 0 0 22 14 17 49 25.0 38 118 -74 0 45 46 - 0 1 19 0 51 49 - 0 7 23 0.17 80 0 0 - 0 20 54 17 49 1.0 40 118 -76 0 2 40 - 0 44 31 0 8 45 - 0 50 36 0.17 81 0 0 - 1 4 20 17 48 36.4 41 117 -77 - 0 40 42 - 1 28 0 - 0 34 37 - 1 34 6 0.17 82 0 0 - 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-49 4 52 -48 18 0 -49 10 13 0.22 -120 0 0 -48 27 18 16 56 29.6 9 249 23 -48 6 28 -48 48 10 -48 1 6 -48 53 32 0.22 -119 0 0 -48 9 56 16 56 25.8 9 248 23 -47 49 1 -48 30 53 -47 43 38 -48 36 17 0.22 -118 0 0 -47 51 59 16 56 22.2 8 247 24 -47 30 58 -48 13 2 -47 25 34 -48 18 27 0.22 -117 0 0 -47 33 26 16 56 18.9 7 247 25 -47 12 20 -47 54 35 -47 6 54 -48 0 2 0.22 -116 0 0 -47 14 17 16 56 15.9 7 246 25 -46 53 4 -47 35 31 -46 47 37 -47 40 59 0.22 -115 0 0 -46 54 30 16 56 13.2 6 245 26 -46 33 11 -47 15 50 -46 27 43 -47 21 20 0.22 -114 0 0 -46 34 5 16 56 10.8 5 244 27 -46 12 40 -46 55 31 -46 7 10 -47 1 2 0.23 -113 0 0 -46 13 1 16 56 8.7 4 244 28 -45 51 30 -46 34 33 -45 45 58 -46 40 7 0.24 -112 0 0 -45 51 18 16 56 6.9 3 243 28 -45 29 41 -46 12 57 -45 24 7 -46 18 31 0.25 -111 0 0 -45 28 54 16 56 5.4 3 242 29 -45 7 11 -45 50 40 -45 1 35 -45 56 16 0.26 -110 0 0 -45 5 50 16 56 4.3 2 242 30 -44 44 0 -45 27 42 -44 38 22 -45 33 20 0.30 -109 0 0 -44 42 4 16 56 3.6 1 241 31 -44 20 7 -45 4 3 -44 14 28 -45 9 43 0.38 -108 0 0 -44 17 35 16 56 3.2 0 240 31 -43 55 31 -44 39 41 -43 49 50 -44 45 23 1.04 Uncertainty in time = +/- 6 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 345-073636 * constellation : Libra * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 15 03 16.2566 DE: -21 04 11.146 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 15 03 16.2566 DE: -21 04 11.146 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.5 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (336) Lacadiera asteroid class: approx. diameter [km]: 70 approx. diameter ["]: 0.079 distance from Earth [AU]: 1.21840 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#123 date of fit: 2023 Feb 07 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): 0.023", 0.003", 99.373° remarks: * orbital elements for (336)Lacadiera : Mean anomaly = 315.4822312481 deg Arg. of pericenter = 30.9438577204 deg Long. of node = 234.9858958974 deg Inclination = 5.6518243494 deg Eccentricity = 0.0953250601 Semimajor axis = 2.2519587044 AU Perihelion dist = 2.0372906055 AU Mag: H = 9.85, G = 0.15 Epoch of elements : MJD 60037.72666667 TDT (2023 Apr 03.7267) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1232023Feb07,20.30,2023,4,3,17.436605,-0.129158,-0.183836,-1.585229,1.114221,-0.002937,0.001130,0.000001,0.000000 132.8194,-21.1616,-80.73,5.41,False UCAC4 345-073636,15.05451572,-21.0697628,0.00,12.45,0.00,0.0,0,,15.07685912,-21.1616023,0.94,0.00,0,0,0 336,Lacadiera,12.80,69.7,1.2184,0,0,-0.819,8.05,,3.6,0 0,315.2703,2023,4,3,30.9439,234.9859,5.6518,0.09533,2.25196,2.03729,9.87,5.0,0.15 1.129,0.0227,0.0028,99,0.0102,Known errors,-1.00,-1,-1,-1 20230403_073636,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org