IOTA/IOTA-ES occultation update for (3248) Farinella / UCAC4-268-112653 event on 2023 May 10, 16:44 UT Visible from SE Australia Summary ------- On 2023 May 10 UT, the 38.6 km diameter asteroid (3248) Farinella will occult a 12.2 mag star in the constellation Scorpius for observers along a path across SE Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.58 mag to 15.76 mag (the magnitude of the asteroid) for at most 4.530 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: 78 * date and approx. time of event: 2023 May 10, 16:32 - 2023 May 10, 16:57 * geocentric midpoint of event [JD]: 2460075.19792846 * magnitude of target star: 12.22 * magnitude drop [mag]: 3.58 * estimated maximum duration [s]: 4.530 * Moon: 71 % sunlit, 33° distance * Sun: 145° distance * rough path description: SE Australia The occultation path -------------------- * approximate projected width [km]: 39 * 1 sigma uncertainty interval [path widths]: +/- 0.71 * 1 sigma uncertainty interval [seconds]: +/- 4.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.027, +/- 0.007) * 1 sigma uncertainty ellipse (major, minor, PA): (0.027", 0.007", 97°) * approx speed of asteroid's shadow [km/s]: 8.5189 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-268-112653 by 3248 Farinella on 2023 May 10 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 30 0 0 -23 52 36 16 57 28.9 0 130 -21 -23 38 50 -24 6 21 .. .. .. -24 25 57 .... 31 0 0 -24 39 4 16 57 28.6 2 130 -22 -24 25 24 -24 52 43 -24 5 55 -25 12 11 0.07 32 0 0 -25 24 28 16 57 28.0 3 130 -23 -25 10 54 -25 38 1 -24 51 33 -25 57 21 0.02 33 0 0 -26 8 48 16 57 27.1 4 129 -24 -25 55 20 -26 22 16 -25 36 7 -26 41 27 -0.01 34 0 0 -26 52 5 16 57 26.0 5 129 -25 -26 38 42 -27 5 26 -26 19 38 -27 24 30 -0.02 35 0 0 -27 34 18 16 57 24.5 6 128 -26 -27 21 2 -27 47 34 -27 2 6 -28 6 30 -0.02 36 0 0 -28 15 30 16 57 22.8 7 128 -27 -28 2 19 -28 28 40 -27 43 31 -28 47 27 -0.03 37 0 0 -28 55 39 16 57 20.8 8 127 -28 -28 42 34 -29 8 44 -28 23 54 -29 27 23 -0.03 38 0 0 -29 34 47 16 57 18.6 9 127 -28 -29 21 47 -29 47 46 -29 3 15 -30 6 18 -0.03 39 0 0 -30 12 55 16 57 16.2 10 126 -29 -30 0 0 -30 25 49 -29 41 36 -30 44 12 -0.04 40 0 0 -30 50 2 16 57 13.5 12 126 -30 -30 37 14 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Uncertainty in time = +/- 5 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4-268-112653 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 17 23 08.7715 DE: -36 35 00.248 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 17 23 08.7716 DE: -36 35 00.249 * 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: (3248) Farinella asteroid class: approx. diameter [km]: 39 approx. diameter ["]: 0.025 distance from Earth [AU]: 2.14660 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#57 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", 0.007", 96.867° remarks: * orbital elements for (3248)Farinella : Mean anomaly = 299.3397679360 deg Arg. of pericenter = 317.3592632678 deg Long. of node = 12.0386129892 deg Inclination = 10.9007208659 deg Eccentricity = 0.1517624578 Semimajor axis = 3.2036210325 AU Perihelion dist = 2.7174316308 AU Mag: H = 11.02, G = 0.15 Epoch of elements : MJD 60074.69770833 TDT (2023 May 10.6977) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#572023Apr24,4.53,2023,5,10,16.750283,-0.013374,0.021813,-4.109477,-2.496434,-0.003039,0.001295,0.000001,0.000000 141.7039,-36.6052,-72.15,17.68,False UCAC4-268-112653,17.38576986,-36.5834022,0.00,12.22,0.00,0.0,0,,17.41222146,-36.6052210,3.59,0.00,0,0,0 3248,Farinella,15.76,38.6,2.1466,0,0,-1.398,-10.23,,2.2,0 0,299.2198,2023,5,10,317.3593,12.0386,10.9007,0.15176,3.20362,2.71743,11.01,5.0,0.15 1.713,0.0273,0.0067,97,0.0177,Known errors,-1.00,-1,-1,-1 20230510_112653,60063.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org