IOTA/IOTA-ES occultation update for (113) Amalthea / UCAC4 341-197456 event on 2022 Oct 01, 07:49 UT Visible from New Zealand Summary ------- On 2022 Oct 01 UT, the 48.8 km diameter asteroid (113) Amalthea will occult a 12.0 mag star in the constellation Capricornus for observers along a path across New Zealand. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.37 mag to 13.05 mag (the magnitude of the asteroid) for at most 8.440 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 01, 07:31 - 2022 Oct 01, 08:06 * geocentric midpoint of event [JD]: 2459853.82591350 * magnitude of target star: 12.04 * magnitude drop [mag]: 1.37 * estimated maximum duration [s]: 8.440 * Moon: 32 % sunlit, 46° distance * Sun: 115° distance * rough path description: New Zealand The occultation path -------------------- * approximate projected width [km]: 53 * 1 sigma uncertainty interval [path widths]: +/- 0.05 * 1 sigma uncertainty interval [seconds]: +/- 1.7 * 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]: 5.7819 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 341-197456 by 113 Amalthea on 2022 Oct 1 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 81 0 0 -26 40 51 7 32 13.5 0 115 62 -26 56 45 .. .. .. -26 58 25 .. .. .. .... 82 0 0 -27 5 27 7 32 13.7 1 114 61 -27 21 20 -26 49 35 -27 23 0 -26 47 55 0.38 83 0 0 -27 29 55 7 32 14.3 2 114 60 -27 45 49 -27 14 4 -27 47 29 -27 12 24 0.41 84 0 0 -27 54 17 7 32 15.2 3 113 59 -28 10 10 -27 38 26 -28 11 50 -27 36 46 0.42 85 0 0 -28 18 30 7 32 16.4 4 113 58 -28 34 22 -28 2 39 -28 36 2 -28 1 0 0.42 86 0 0 -28 42 34 7 32 18.0 5 112 57 -28 58 26 -28 26 44 -29 0 6 -28 25 4 0.43 87 0 0 -29 6 29 7 32 19.9 6 112 56 -29 22 20 -28 50 39 -29 24 0 -28 49 0 0.43 88 0 0 -29 30 14 7 32 22.2 7 111 56 -29 46 4 -29 14 25 -29 47 44 -29 12 45 0.43 89 0 0 -29 53 48 7 32 24.8 8 111 55 -30 9 38 -29 38 0 -30 11 18 -29 36 21 0.43 90 0 0 -30 17 11 7 32 27.7 9 110 54 -30 33 0 -30 1 24 -30 34 40 -29 59 45 0.43 91 0 0 -30 40 23 7 32 30.9 10 110 53 -30 56 11 -30 24 36 -30 57 51 -30 22 57 0.43 92 0 0 -31 3 22 7 32 34.4 11 109 52 -31 19 10 -30 47 37 -31 20 49 -30 45 58 0.43 93 0 0 -31 26 9 7 32 38.3 12 109 51 -31 41 55 -31 10 25 -31 43 35 -31 8 46 0.43 94 0 0 -31 48 43 7 32 42.4 13 108 50 -32 4 28 -31 32 59 -32 6 7 -31 31 21 0.43 95 0 0 -32 11 3 7 32 46.8 13 107 49 -32 26 47 -31 55 21 -32 28 26 -31 53 42 0.43 96 0 0 -32 33 9 7 32 51.6 14 107 48 -32 48 52 -32 17 28 -32 50 31 -32 15 49 0.43 97 0 0 -32 55 0 7 32 56.6 15 106 47 -33 10 42 -32 39 21 -33 12 21 -32 37 42 0.43 98 0 0 -33 16 37 7 33 1.9 16 106 46 -33 32 17 -33 0 58 -33 33 56 -32 59 20 0.43 99 0 0 -33 37 58 7 33 7.4 17 105 46 -33 53 37 -33 22 21 -33 55 16 -33 20 43 0.43 100 0 0 -33 59 4 7 33 13.3 18 105 45 -34 14 41 -33 43 28 -34 16 20 -33 41 50 0.43 101 0 0 -34 19 53 7 33 19.4 19 104 44 -34 35 29 -34 4 18 -34 37 7 -34 2 41 0.43 102 0 0 -34 40 25 7 33 25.7 20 103 43 -34 56 0 -34 24 53 -34 57 38 -34 23 15 0.43 103 0 0 -35 0 41 7 33 32.3 21 103 42 -35 16 14 -34 45 10 -35 17 52 -34 43 32 0.43 104 0 0 -35 20 40 7 33 39.2 22 102 41 -35 36 11 -35 5 10 -35 37 49 -35 3 33 0.43 105 0 0 -35 40 21 7 33 46.3 23 101 40 -35 55 51 -35 24 53 -35 57 28 -35 23 15 0.43 106 0 0 -35 59 44 7 33 53.6 23 101 39 -36 15 12 -35 44 17 -36 16 50 -35 42 40 0.43 107 0 0 -36 18 49 7 34 1.1 24 100 38 -36 34 16 -36 3 24 -36 35 53 -36 1 47 0.43 108 0 0 -36 37 36 7 34 8.9 25 99 38 -36 53 1 -36 22 12 -36 54 38 -36 20 36 0.43 109 0 0 -36 56 4 7 34 16.9 26 99 37 -37 11 27 -36 40 42 -37 13 4 -36 39 6 0.43 110 0 0 -37 14 13 7 34 25.1 27 98 36 -37 29 34 -36 58 53 -37 31 11 -36 57 17 0.43 111 0 0 -37 32 3 7 34 33.5 28 97 35 -37 47 22 -37 16 45 -37 48 59 -37 15 9 0.43 112 0 0 -37 49 33 7 34 42.1 29 96 34 -38 4 51 -37 34 17 -38 6 27 -37 32 41 0.43 113 0 0 -38 6 44 7 34 50.8 29 96 33 -38 22 0 -37 51 30 -38 23 36 -37 49 54 0.43 114 0 0 -38 23 36 7 34 59.8 30 95 32 -38 38 50 -38 8 23 -38 40 26 -38 6 48 0.42 115 0 0 -38 40 7 7 35 9.0 31 94 32 -38 55 20 -38 24 57 -38 56 55 -38 23 21 0.42 116 0 0 -38 56 19 7 35 18.3 32 93 31 -39 11 29 -38 41 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-22 12 12 -22 45 51 -22 10 32 0.46 -108 0 0 -22 1 48 8 5 13.3 19 253 -60 -22 17 47 -21 45 50 -22 19 28 -21 44 10 0.46 -107 0 0 -21 35 26 8 5 20.1 18 253 -60 -21 51 25 -21 19 29 -21 53 5 -21 17 49 0.46 -106 0 0 -21 9 5 8 5 26.6 17 252 -60 -21 25 4 -20 53 9 -21 26 44 -20 51 29 0.46 -105 0 0 -20 42 47 8 5 32.7 16 252 -60 -20 58 45 -20 26 51 -21 0 25 -20 25 11 0.46 -104 0 0 -20 16 31 8 5 38.4 15 252 -59 -20 32 28 -20 0 36 -20 34 9 -19 58 57 0.47 -103 0 0 -19 50 19 8 5 43.7 13 251 -59 -20 6 15 -19 34 25 -20 7 56 -19 32 45 0.47 -102 0 0 -19 24 11 8 5 48.6 12 251 -59 -19 40 7 -19 8 18 -19 41 47 -19 6 38 0.47 -101 0 0 -18 58 9 8 5 53.2 11 251 -58 -19 14 3 -18 42 16 -19 15 43 -18 40 37 0.47 -100 0 0 -18 32 11 8 5 57.3 10 250 -58 -18 48 5 -18 16 20 -18 49 45 -18 14 41 0.48 - 99 0 0 -18 6 21 8 6 1.1 9 250 -57 -18 22 13 -17 50 31 -18 23 53 -17 48 51 0.48 - 98 0 0 -17 40 37 8 6 4.4 8 250 -57 -17 56 28 -17 24 48 -17 58 8 -17 23 9 0.49 - 97 0 0 -17 15 2 8 6 7.4 7 249 -56 -17 30 51 -16 59 14 -17 32 31 -16 57 35 0.49 - 96 0 0 -16 49 34 8 6 9.9 6 249 -56 -17 5 23 -16 33 48 -17 7 2 -16 32 9 0.50 - 95 0 0 -16 24 16 8 6 12.1 5 249 -55 -16 40 4 -16 8 31 -16 41 43 -16 6 52 0.51 - 94 0 0 -15 59 8 8 6 13.8 4 248 -55 -16 14 54 -15 43 24 -16 16 33 -15 41 45 0.53 - 93 0 0 -15 34 10 8 6 15.2 3 248 -54 -15 49 55 -15 18 28 -15 51 34 -15 16 49 0.57 - 92 0 0 -15 9 23 8 6 16.1 2 248 -53 -15 25 6 -14 53 42 -15 26 45 -14 52 4 0.64 - 91 0 0 -14 44 48 8 6 16.7 1 248 -53 -15 0 29 -14 29 8 -15 2 8 -14 27 30 0.88 Uncertainty in time = +/- 2 secs Prediction of 2022 Aug 20.1 Data for the target star ------------------------ * name: UCAC4 341-197456 * constellation : Capricornus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 20 20 55.8388 DE: -21 53 54.745 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 20 20 55.8388 DE: -21 53 54.745 * position source: Gaia EDR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 12.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (113) Amalthea asteroid class: approx. diameter [km]: 49 approx. diameter ["]: 0.036 distance from Earth [AU]: 1.88070 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", 79.404° remarks: * orbital elements for (113)Amalthea : Mean anomaly = 113.1896712208 deg Arg. of pericenter = 78.8082425388 deg Long. of node = 123.4439627271 deg Inclination = 5.0426207792 deg Eccentricity = 0.0860432030 Semimajor axis = 2.3763024397 AU Perihelion dist = 2.1718377665 AU Mag: H = 8.66, G = 0.35 Epoch of elements : MJD 59853.32604167 TDT (2022 Oct 01.3260) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1372022Aug03,8.44,2022,10,1,7.821924,0.046710,-0.373171,3.241579,0.377319,0.004966,0.001280,0.000001,0.000000 178.2061,-21.8272,60.11,-3.22,False UCAC4 341-197456,20.34884413,-21.8985403,0.00,12.04,0.00,0.0,0,,20.37098262,-21.8272447,1.37,0.00,0,0,0 113,Amalthea,13.05,48.8,1.8807,0,0,1.090,1.77,,2.8,0 0,113.1019,2022,10,1,78.8082,123.4440,5.0426,0.08604,2.37630,2.17184,8.66,5.0,0.15 1.052,0.0073,0.0018,79,0.0019,Known errors,-1.00,-1,-1,-1 20221001_197456,59811.11 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Aug 20, 02:34 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org