IOTA/IOTA-ES occultation update for (113) Amalthea / TYC 6340-00045-1 event on 2022 Oct 04, 11:40 UT Visible from Australia Summary ------- On 2022 Oct 04 UT, the 48.8 km diameter asteroid (113) Amalthea will occult a 10.9 mag star in the constellation Capricornus 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 2.35 mag to 13.11 mag (the magnitude of the asteroid) for at most 6.940 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: 100 * date and approx. time of event: 2022 Oct 04, 11:25 - 2022 Oct 04, 11:55 * geocentric midpoint of event [JD]: 2459856.98644550 * magnitude of target star: 10.89 * magnitude drop [mag]: 2.35 * estimated maximum duration [s]: 6.940 * Moon: 67 % sunlit, 3° distance * Sun: 112° distance * rough path description: Australia The occultation path -------------------- * approximate projected width [km]: 50 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 1.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.007, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.007", 0.002", 79°) * approx speed of asteroid's shadow [km/s]: 7.0279 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6340-00045-1 by 113 Amalthea on 2022 Oct 4 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 24 0 0 -18 4 49 11 25 36.3 0 113 68 -18 19 33 .. .. .. -18 21 3 .. .. .. .... 25 0 0 -18 29 4 11 25 36.4 1 113 67 -18 43 47 -18 14 22 -18 45 17 -18 12 52 0.25 26 0 0 -18 53 9 11 25 36.9 2 112 66 -19 7 51 -18 38 27 -19 9 21 -18 36 57 0.23 27 0 0 -19 17 3 11 25 37.7 3 112 65 -19 31 45 -19 2 22 -19 33 15 -19 0 53 0.23 28 0 0 -19 40 47 11 25 38.7 4 112 64 -19 55 28 -19 26 7 -19 56 58 -19 24 37 0.23 29 0 0 -20 4 19 11 25 40.1 5 111 63 -20 18 59 -19 49 40 -20 20 29 -19 48 11 0.23 30 0 0 -20 27 40 11 25 41.7 6 111 62 -20 42 19 -20 13 2 -20 43 49 -20 11 32 0.22 31 0 0 -20 50 49 11 25 43.7 7 111 61 -21 5 27 -20 36 11 -21 6 57 -20 34 42 0.22 32 0 0 -21 13 44 11 25 45.9 8 110 60 -21 28 21 -20 59 8 -21 29 51 -20 57 38 0.22 33 0 0 -21 36 26 11 25 48.4 9 110 59 -21 51 3 -21 21 51 -21 52 32 -21 20 21 0.22 34 0 0 -21 58 55 11 25 51.2 10 109 58 -22 13 30 -21 44 20 -22 14 59 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2 52 40 .. .. .. 338.68 Uncertainty in time = +/- 1 secs Prediction of 2022 Aug 20.1 Data for the target star ------------------------ * name: TYC 6340-00045-1 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 22 26.1835 DE: -21 51 11.613 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 22 26.1833 DE: -21 51 11.613 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 10.9 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (113) Amalthea asteroid class: approx. diameter [km]: 49 approx. diameter ["]: 0.035 distance from Earth [AU]: 1.92080 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#137 date of fit: 2022 Aug 03 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): 0.007", 0.002", 79.338° remarks: * orbital elements for (113)Amalthea : Mean anomaly = 114.0352181584 deg Arg. of pericenter = 78.8131424935 deg Long. of node = 123.4438817394 deg Inclination = 5.0426022854 deg Eccentricity = 0.0860394883 Semimajor axis = 2.3763210908 AU Perihelion dist = 2.1718636402 AU Mag: H = 8.66, G = 0.35 Epoch of elements : MJD 59856.48666667 TDT (2022 Oct 04.4867) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1372022Aug03,6.94,2022,10,4,11.674692,0.029967,-0.189999,3.925220,0.572344,0.005056,0.001306,0.000000,0.000000 117.6754,-21.7813,2.07,-4.45,False TYC 6340-00045-1,20.37393983,-21.8532258,0.00,10.89,0.00,0.0,0,,20.39605650,-21.7812735,2.35,0.00,0,0,0 113,Amalthea,13.11,48.8,1.9208,0,0,1.291,2.62,,2.8,0 0,113.9043,2022,10,4,78.8131,123.4439,5.0426,0.08604,2.37632,2.17186,8.66,5.0,0.15 1.051,0.0070,0.0018,79,0.0018,Known errors,-1.00,-1,-1,-1 20221004_0045-1,59811.11 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Aug 20, 02:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org