IOTA/IOTA-ES occultation update for (5144) Achates / TYC 5805-01100-1 event on 2023 Sep 03, 01:46 UT Visible from Africa, South America Summary ------- On 2023 Sep 03 UT, the 86.4 km diameter asteroid (5144) Achates will occult a 11.0 mag star in the constellation Aquarius 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 3.84 mag to 14.78 mag (the magnitude of the asteroid) for at most 6.850 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 Sep 03, 01:38 - 2023 Sep 03, 01:55 * geocentric midpoint of event [JD]: 2460190.57439700 * magnitude of target star: 10.97 * magnitude drop [mag]: 3.84 * estimated maximum duration [s]: 6.850 * Moon: 87 % sunlit, 53° distance * Sun: 169° distance * rough path description: Africa, South America Additional comments ------------------- RUWE high The occultation path -------------------- * approximate projected width [km]: 87 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 5.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.016) * 1 sigma uncertainty ellipse (major, minor, PA): (0.032", 0.001", 61°) * approx speed of asteroid's shadow [km/s]: 12.6207 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5805-01100-1 by 5144 Achates on 2023 Sep 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 -130 0 0 - 1 41 39 1 55 28.5 1 100 11 - 1 17 35 - 2 5 41 - 1 4 40 - 2 18 34 .... -129 0 0 - 1 52 11 1 55 28.3 2 100 10 - 1 28 8 - 2 16 12 - 1 15 13 - 2 29 5 -0.06 -128 0 0 - 2 2 31 1 55 28.0 3 100 9 - 1 38 29 - 2 26 32 - 1 25 35 - 2 39 24 -0.09 -127 0 0 - 2 12 40 1 55 27.5 4 100 8 - 1 48 38 - 2 36 40 - 1 35 45 - 2 49 31 -0.11 -126 0 0 - 2 22 36 1 55 26.9 5 100 7 - 1 58 35 - 2 46 35 - 1 45 42 - 2 59 26 -0.12 -125 0 0 - 2 32 20 1 55 26.1 6 100 6 - 2 8 21 - 2 56 19 - 1 55 28 - 3 9 9 -0.12 -124 0 0 - 2 41 52 1 55 25.1 7 100 5 - 2 17 53 - 3 5 50 - 2 5 1 - 3 18 40 -0.13 -123 0 0 - 2 51 12 1 55 24.0 8 100 4 - 2 27 13 - 3 15 9 - 2 14 22 - 3 27 58 -0.13 -122 0 0 - 3 0 18 1 55 22.7 9 100 3 - 2 36 21 - 3 24 15 - 2 23 30 - 3 37 4 -0.13 -121 0 0 - 3 9 12 1 55 21.3 10 100 2 - 2 45 16 - 3 33 8 - 2 32 25 - 3 45 57 -0.13 -120 0 0 - 3 17 54 1 55 19.7 11 100 1 - 2 53 58 - 3 41 48 - 2 41 7 - 3 54 37 -0.13 -119 0 0 - 3 26 22 1 55 18.0 12 100 0 - 3 2 27 - 3 50 16 - 2 49 36 - 4 3 4 -0.13 -118 0 0 - 3 34 37 1 55 16.1 13 100 -1 - 3 10 42 - 3 58 30 - 2 57 53 - 4 11 18 -0.13 -117 0 0 - 3 42 39 1 55 14.1 14 99 -2 - 3 18 45 - 4 6 31 - 3 5 56 - 4 19 19 -0.14 -116 0 0 - 3 50 28 1 55 11.9 15 99 -3 - 3 26 35 - 4 14 19 - 3 13 46 - 4 27 6 -0.14 -115 0 0 - 3 58 3 1 55 9.6 16 99 -4 - 3 34 10 - 4 21 54 - 3 21 22 - 4 34 40 -0.14 -114 0 0 - 4 5 25 1 55 7.1 17 99 -5 - 3 41 33 - 4 29 15 - 3 28 45 - 4 42 1 -0.14 -113 0 0 - 4 12 33 1 55 4.5 18 99 -6 - 3 48 42 - 4 36 23 - 3 35 54 - 4 49 9 -0.14 -112 0 0 - 4 19 28 1 55 1.8 19 99 -7 - 3 55 37 - 4 43 17 - 3 42 50 - 4 56 2 -0.14 -111 0 0 - 4 26 9 1 54 58.9 20 99 -8 - 4 2 19 - 4 49 57 - 3 49 32 - 5 2 42 -0.14 -110 0 0 - 4 32 36 1 54 55.9 21 99 -9 - 4 8 47 - 4 56 24 - 3 56 0 - 5 9 8 -0.14 -109 0 0 - 4 38 49 1 54 52.7 22 99 -10 - 4 15 1 - 5 2 36 - 4 2 14 - 5 15 21 -0.14 -108 0 0 - 4 44 48 1 54 49.4 23 99 -11 - 4 21 0 - 5 8 35 - 4 8 14 - 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14 40 -0.14 - 95 0 0 - 5 41 12 1 53 54.5 35 98 -24 - 5 17 29 - 6 4 53 - 5 4 46 - 6 17 34 -0.14 - 94 0 0 - 5 43 52 1 53 49.4 36 98 -25 - 5 20 10 - 6 7 32 - 5 7 27 - 6 20 13 -0.14 - 93 0 0 - 5 46 17 1 53 44.2 37 98 -26 - 5 22 35 - 6 9 57 - 5 9 52 - 6 22 38 -0.14 - 92 0 0 - 5 48 28 1 53 38.9 38 98 -27 - 5 24 46 - 6 12 8 - 5 12 4 - 6 24 49 -0.14 - 91 0 0 - 5 50 24 1 53 33.5 39 98 -28 - 5 26 43 - 6 14 4 - 5 14 0 - 6 26 45 -0.14 - 90 0 0 - 5 52 6 1 53 28.0 40 98 -29 - 5 28 25 - 6 15 46 - 5 15 43 - 6 28 27 -0.14 - 89 0 0 - 5 53 34 1 53 22.4 41 98 -30 - 5 29 53 - 6 17 13 - 5 17 10 - 6 29 54 -0.14 - 88 0 0 - 5 54 47 1 53 16.6 42 98 -31 - 5 31 6 - 6 18 26 - 5 18 24 - 6 31 7 -0.14 - 87 0 0 - 5 55 45 1 53 10.8 43 98 -32 - 5 32 5 - 6 19 25 - 5 19 22 - 6 32 5 -0.14 - 86 0 0 - 5 56 29 1 53 4.8 44 98 -33 - 5 32 49 - 6 20 9 - 5 20 7 - 6 32 49 -0.14 - 85 0 0 - 5 56 59 1 52 58.8 45 98 -34 - 5 33 19 - 6 20 38 - 5 20 36 - 6 33 18 -0.14 - 84 0 0 - 5 57 14 1 52 52.6 46 98 -35 - 5 33 34 - 6 20 53 - 5 20 52 - 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14 10 39 4 9 24 11 -0.15 18 0 0 10 15 58 1 40 6.0 32 251 -43 10 40 21 9 51 37 10 53 26 9 38 34 -0.15 19 0 0 10 30 18 1 40 1.4 31 251 -42 10 54 41 10 5 57 11 7 46 9 52 54 -0.15 20 0 0 10 44 35 1 39 56.9 30 252 -42 11 8 58 10 20 14 11 22 3 10 7 12 -0.15 21 0 0 10 58 49 1 39 52.5 29 252 -41 11 23 12 10 34 29 11 36 16 10 21 26 -0.15 22 0 0 11 13 0 1 39 48.3 28 252 -40 11 37 22 10 48 40 11 50 27 10 35 37 -0.15 23 0 0 11 27 8 1 39 44.1 27 252 -39 11 51 30 11 2 48 12 4 34 10 49 45 -0.15 24 0 0 11 41 11 1 39 40.2 26 253 -38 12 5 33 11 16 52 12 18 37 11 3 49 -0.15 25 0 0 11 55 11 1 39 36.3 25 253 -37 12 19 32 11 30 51 12 32 36 11 17 49 -0.15 26 0 0 12 9 6 1 39 32.7 24 253 -36 12 33 27 11 44 47 12 46 31 11 31 45 -0.15 27 0 0 12 22 57 1 39 29.1 23 253 -35 12 47 17 11 58 38 13 0 21 11 45 36 -0.15 28 0 0 12 36 43 1 39 25.7 22 253 -34 13 1 3 12 12 24 13 14 6 11 59 23 -0.15 29 0 0 12 50 23 1 39 22.4 21 254 -33 13 14 43 12 26 5 13 27 46 12 13 4 -0.15 30 0 0 13 3 58 1 39 19.3 20 254 -32 13 28 17 12 39 41 13 41 20 12 26 40 -0.15 31 0 0 13 17 28 1 39 16.3 19 254 -31 13 41 47 12 53 11 13 54 49 12 40 10 -0.15 32 0 0 13 30 52 1 39 13.5 18 254 -30 13 55 10 13 6 35 14 8 12 12 53 35 -0.15 33 0 0 13 44 9 1 39 10.8 17 255 -29 14 8 27 13 19 53 14 21 29 13 6 53 -0.15 34 0 0 13 57 20 1 39 8.3 16 255 -28 14 21 37 13 33 5 14 34 39 13 20 5 -0.15 35 0 0 14 10 25 1 39 5.9 15 255 -27 14 34 41 13 46 10 14 47 43 13 33 10 -0.15 36 0 0 14 23 22 1 39 3.6 14 255 -26 14 47 38 13 59 8 15 0 39 13 46 9 -0.15 37 0 0 14 36 13 1 39 1.5 13 256 -25 15 0 28 14 11 59 15 13 29 13 59 0 -0.15 38 0 0 14 48 56 1 38 59.6 12 256 -24 15 13 11 14 24 43 15 26 11 14 11 44 -0.15 39 0 0 15 1 31 1 38 57.8 11 256 -23 15 25 45 14 37 19 15 38 46 14 24 21 -0.15 40 0 0 15 13 59 1 38 56.1 10 256 -22 15 38 12 14 49 47 15 51 12 14 36 49 -0.15 41 0 0 15 26 19 1 38 54.6 9 257 -21 15 50 31 15 2 7 16 3 31 14 49 10 -0.15 42 0 0 15 38 30 1 38 53.2 9 257 -20 16 2 42 15 14 19 16 15 41 15 1 22 -0.15 43 0 0 15 50 33 1 38 52.0 8 257 -19 16 14 44 15 26 23 16 27 43 15 13 26 -0.15 44 0 0 16 2 27 1 38 50.9 7 258 -18 16 26 38 15 38 18 16 39 36 15 25 21 -0.15 45 0 0 16 14 12 1 38 50.0 6 258 -17 16 38 22 15 50 4 16 51 20 15 37 8 -0.15 46 0 0 16 25 48 1 38 49.3 5 258 -16 16 49 58 16 1 41 17 2 55 15 48 45 -0.15 47 0 0 16 37 15 1 38 48.6 4 258 -15 17 1 24 16 13 8 17 14 21 16 0 13 -0.15 48 0 0 16 48 33 1 38 48.2 3 259 -14 17 12 40 16 24 26 17 25 37 16 11 31 -0.15 49 0 0 16 59 40 1 38 47.8 2 259 -13 17 23 47 16 35 34 17 36 44 16 22 40 -0.15 50 0 0 17 10 38 1 38 47.7 1 259 -12 17 34 44 16 46 33 17 47 40 16 33 39 -0.15 Uncertainty in time = +/- 5 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: TYC 5805-01100-1 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 22 00 50.5642 DE: -10 12 05.309 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 22 00 50.5641 DE: -10 12 05.309 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.300,0.200) * V mag [mag]: 11.0 * 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]: 2.94500 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#66 date of fit: 2023 Aug 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): 0.032", 0.001", 61.028° remarks: * orbital elements for (5144)Achates : Mean anomaly = 20.9276887739 deg Arg. of pericenter = 331.9221834709 deg Long. of node = 322.8133614260 deg Inclination = 8.9169704875 deg Eccentricity = 0.2728888306 Semimajor axis = 5.1838374960 AU Perihelion dist = 3.7692261437 AU Mag: H = 9.15, G = 0.15 Epoch of elements : MJD 60190.07388889 TDT (2023 Sep 03.0739) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#662023Aug24,6.85,2023,9,3,1.785528,-0.022704,0.136173,-7.024949,-1.180792,0.001104,0.000214,0.000001,0.000000 -38.2000,-10.0869,153.12,7.69,False TYC 5805-01100-1,22.01404560,-10.2014748,0.00,10.97,0.00,0.0,0,,22.03528979,-10.0868601,3.84,0.00,0,0,0 5144,Achates,14.78,86.400,2.9450,0,0,-1.420,-3.52,,5.8,0 0,20.8380,2023,9,2,331.9222,322.8134,8.9170,0.27289,5.18384,3.76923,9.16,5.0,0.15 1.268,0.0323,0.0015,61,0.0324,Known errors,-1.00,0,-1,-1 20230903_1100-1,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org