IOTA/IOTA-ES occultation update for (5144) Achates / UCAC4-283-151661 event on 2022 May 20, 03:54 UT Visible from Africa, South America Summary ------- On 2022 May 20 UT, the 86.4 km diameter asteroid (5144) Achates will occult a 12.5 mag star in the constellation Sagittarius 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 2.67 mag to 15.04 mag (the magnitude of the asteroid) for at most 10.450 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 May 20, 03:41 - 2022 May 20, 04:08 * geocentric midpoint of event [JD]: 2459719.66328354 * magnitude of target star: 12.47 * magnitude drop [mag]: 2.67 * estimated maximum duration [s]: 10.450 * Moon: 78 % sunlit, 24° distance * Sun: 147° distance * rough path description: Africa, South America The occultation path -------------------- * approximate projected width [km]: 87 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 13.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.049, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.049", 0.003", 85°) * approx speed of asteroid's shadow [km/s]: 8.2688 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-283-151661 by 5144 Achates on 2022 May 20 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 -125 0 0 -10 30 29 4 7 55.3 1 124 -30 -10 2 13 -10 58 46 - 9 56 49 -11 4 10 .... -124 0 0 -11 10 22 4 7 54.8 2 124 -31 -10 42 9 -11 38 36 -10 36 46 -11 44 0 0.10 -123 0 0 -11 49 56 4 7 54.0 3 124 -32 -11 21 46 -12 18 7 -11 16 23 -12 23 30 0.08 -122 0 0 -12 29 10 4 7 52.9 5 123 -33 -12 1 3 -12 57 17 -11 55 41 -13 2 39 0.07 -121 0 0 -13 8 2 4 7 51.5 6 123 -34 -12 39 59 -13 36 6 -12 34 38 -13 41 28 0.06 -120 0 0 -13 46 32 4 7 49.7 7 123 -35 -13 18 32 -14 14 33 -13 13 12 -14 19 54 0.06 -119 0 0 -14 24 39 4 7 47.7 8 123 -36 -13 56 43 -14 52 36 -13 51 24 -14 57 56 0.05 -118 0 0 -15 2 22 4 7 45.4 9 122 -37 -14 34 30 -15 30 15 -14 29 11 -15 35 34 0.05 -117 0 0 -15 39 40 4 7 42.8 10 122 -38 -15 11 52 -16 7 29 -15 6 34 -16 12 47 0.05 -116 0 0 -16 16 33 4 7 39.9 11 122 -39 -15 48 49 -16 44 17 -15 43 31 -16 49 34 0.05 -115 0 0 -16 52 58 4 7 36.7 13 122 -41 -16 25 19 -17 20 38 -16 20 2 -17 25 55 0.05 -114 0 0 -17 28 57 4 7 33.3 14 121 -42 -17 1 22 -17 56 32 -16 56 6 -18 1 48 0.05 -113 0 0 -18 4 28 4 7 29.6 15 121 -43 -17 36 57 -18 31 59 -17 31 42 -18 37 14 0.05 -112 0 0 -18 39 30 4 7 25.7 16 121 -44 -18 12 4 -19 6 56 -18 6 50 -19 12 10 0.05 -111 0 0 -19 14 3 4 7 21.5 17 120 -45 -18 46 42 -19 41 25 -18 41 29 -19 46 38 0.05 -110 0 0 -19 48 7 4 7 17.1 18 120 -46 -19 20 51 -20 15 24 -19 15 39 -20 20 36 0.05 -109 0 0 -20 21 41 4 7 12.4 19 120 -47 -19 54 29 -20 48 52 -19 49 18 -20 54 4 0.05 -108 0 0 -20 54 44 4 7 7.6 20 119 -48 -20 27 38 -21 21 51 -20 22 27 -21 27 1 0.05 -107 0 0 -21 27 16 4 7 2.5 21 119 -49 -21 0 15 -21 54 18 -20 55 6 -21 59 28 0.05 -106 0 0 -21 59 18 4 6 57.2 22 119 -50 -21 32 22 -22 26 15 -21 27 13 -22 31 23 0.05 -105 0 0 -22 30 48 4 6 51.7 23 118 -50 -22 3 57 -22 57 40 -21 58 49 -23 2 47 0.05 -104 0 0 -23 1 46 4 6 46.0 24 118 -51 -22 35 0 -23 28 33 -22 29 54 -23 33 39 0.05 -103 0 0 -23 32 12 4 6 40.2 25 117 -52 -23 5 32 -23 58 54 -23 0 26 -24 3 59 0.05 -102 0 0 -24 2 7 4 6 34.1 26 117 -53 -23 35 31 -24 28 43 -23 30 27 -24 33 47 0.05 -101 0 0 -24 31 28 4 6 27.9 27 117 -54 -24 4 58 -24 58 0 -23 59 55 -25 3 3 0.05 -100 0 0 -25 0 18 4 6 21.5 28 116 -55 -24 33 53 -25 26 44 -24 28 50 -25 31 46 0.05 - 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9 47 22 -10 43 30 - 9 42 1 -10 48 52 0.05 45 0 0 - 9 36 13 3 43 20.1 23 237 8 - 9 8 6 -10 4 20 - 9 2 45 -10 9 41 0.05 46 0 0 - 8 56 45 3 43 14.0 22 237 9 - 8 28 36 - 9 24 54 - 8 23 14 - 9 30 16 0.05 47 0 0 - 8 17 3 3 43 8.1 21 237 10 - 7 48 53 - 8 45 14 - 7 43 30 - 8 50 37 0.05 48 0 0 - 7 37 9 3 43 2.6 20 237 11 - 7 8 57 - 8 5 21 - 7 3 34 - 8 10 44 0.05 49 0 0 - 6 57 3 3 42 57.3 19 237 12 - 6 28 49 - 7 25 17 - 6 23 26 - 7 30 41 0.05 50 0 0 - 6 16 47 3 42 52.3 18 237 13 - 5 48 32 - 6 45 3 - 5 43 9 - 6 50 26 0.05 51 0 0 - 5 36 22 3 42 47.6 16 237 14 - 5 8 6 - 6 4 39 - 5 2 42 - 6 10 3 0.05 52 0 0 - 4 55 50 3 42 43.3 15 237 16 - 4 27 32 - 5 24 8 - 4 22 9 - 5 29 32 0.05 53 0 0 - 4 15 11 3 42 39.2 14 236 17 - 3 46 53 - 4 43 30 - 3 41 29 - 4 48 54 0.05 54 0 0 - 3 34 27 3 42 35.4 13 236 18 - 3 6 9 - 4 2 46 - 3 0 45 - 4 8 10 0.05 55 0 0 - 2 53 40 3 42 32.0 12 236 19 - 2 25 21 - 3 21 59 - 2 19 57 - 3 27 23 0.05 56 0 0 - 2 12 50 3 42 28.9 10 236 20 - 1 44 31 - 2 41 10 - 1 39 7 - 2 46 34 0.05 57 0 0 - 1 32 0 3 42 26.1 9 236 21 - 1 3 41 - 2 0 19 - 0 58 17 - 2 5 43 0.06 58 0 0 - 0 51 10 3 42 23.7 8 236 23 - 0 22 52 - 1 19 29 - 0 17 28 - 1 24 53 0.06 59 0 0 - 0 10 22 3 42 21.6 7 236 24 0 17 56 - 0 38 40 0 23 19 - 0 44 4 0.06 60 0 0 0 30 22 3 42 19.8 6 236 25 0 58 39 0 2 5 1 4 3 - 0 3 19 0.07 61 0 0 1 11 2 3 42 18.4 4 236 26 1 39 18 0 42 46 1 44 41 0 37 22 0.08 62 0 0 1 51 36 3 42 17.3 3 236 27 2 19 50 1 23 21 2 25 13 1 17 58 0.09 63 0 0 2 32 2 3 42 16.5 2 236 28 3 0 15 2 3 48 3 5 37 1 58 25 0.13 64 0 0 3 12 19 3 42 16.1 1 236 30 3 40 30 2 44 7 3 45 52 2 38 45 0.26 Uncertainty in time = +/- 13 secs Prediction of 2022 Mar 27.1 Data for the target star ------------------------ * name: UCAC4-283-151661 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 00 37.2762 DE: -33 32 04.448 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 00 37.2762 DE: -33 32 04.449 * position source: Gaia EDR3 * 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: (5144) Achates asteroid class: approx. diameter [km]: 86 approx. diameter ["]: 0.040 distance from Earth [AU]: 3.01160 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#58 date of fit: 2021 Oct 08 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): 0.049", 0.003", 84.556° remarks: * orbital elements for (5144)Achates : Mean anomaly = 341.6662225115 deg Arg. of pericenter = 331.8186732110 deg Long. of node = 322.8171328707 deg Inclination = 8.9165927889 deg Eccentricity = 0.2731335209 Semimajor axis = 5.1854666142 AU Perihelion dist = 3.7691418604 AU Mag: H = 9.12, G = 0.15 Epoch of elements : MJD 59719.16305556 TDT (2022 May 20.1631) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#582021Oct08,10.45,2022,5,20,3.918805,0.006815,-0.064681,-4.620221,-0.660142,-0.003022,0.000852,0.000001,0.000000 -26.0487,-33.5348,120.36,19.97,False UCAC4-283-151661,18.01035450,-33.5345690,0.00,12.47,0.00,0.0,0,,18.03504770,-33.5347755,2.66,0.00,0,0,0 5144,Achates,15.04,86.4,3.0116,0,0,-1.078,-1.93,,5.8 0,341.6526,2022,5,20,331.8187,322.8171,8.9166,0.27313,5.18547,3.76914,9.12,5.0,0.15 1.095,0.0493,0.0030,85,0.0038,Known errors,-1.00,-1,-1,-1 20220520_151661,59665.09 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Mar 27, 02:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org