IOTA/IOTA-ES occultation update for (588) Achilles / UCAC4-608-013357 event on 2023 Jan 30, 19:58 UT Visible from Europe, Africa Summary ------- On 2023 Jan 30 UT, the 133.4 km diameter asteroid (588) Achilles will occult a 12.5 mag star in the constellation Perseus for observers along a path across Europe, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.79 mag to 15.16 mag (the magnitude of the asteroid) for at most 24.200 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: 90 * date and approx. time of event: 2023 Jan 30, 19:50 - 2023 Jan 30, 20:30 * geocentric midpoint of event [JD]: 2459975.34070966 * magnitude of target star: 12.46 * magnitude drop [mag]: 2.79 * estimated maximum duration [s]: 24.200 * Moon: 71 % sunlit, 8° distance * Sun: 118° distance * rough path description: Europe, Africa The occultation path -------------------- * approximate projected width [km]: 133 * 1 sigma uncertainty interval [path widths]: +/- 0.53 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.025, +/- 0.004) * 1 sigma uncertainty ellipse (major, minor, PA): (0.025", 0.004", 84°) * approx speed of asteroid's shadow [km/s]: 5.5114 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4-608-013357 by 588 Achilles on 2023 Jan 30 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 ' " Longitude Longitude Longitude Longitude 11 25 41 -56 0 0 20 29 51.1 0 341 -8 10 17 42 12 34 7 9 6 24 ... .. .. .... 10 49 5 -55 0 0 20 29 50.8 2 341 -8 9 43 1 11 55 34 8 33 43 13 6 13 -0.09 10 14 33 -54 0 0 20 29 50.1 3 342 -9 9 10 16 11 19 13 8 2 48 12 27 54 -0.09 9 41 53 -53 0 0 20 29 49.0 4 342 -9 8 39 17 10 44 51 7 33 33 11 51 43 -0.09 9 10 58 -52 0 0 20 29 47.5 5 342 -10 8 9 55 10 12 21 7 5 48 11 17 30 -0.09 8 41 38 -51 0 0 20 29 45.7 6 343 -10 7 42 2 9 41 32 6 39 27 10 45 5 -0.09 8 13 47 -50 0 0 20 29 43.5 7 343 -11 7 15 33 9 12 17 6 14 23 10 14 20 -0.09 7 47 17 -49 0 0 20 29 40.9 8 343 -11 6 50 21 8 44 28 5 50 31 9 45 8 -0.09 7 22 4 -48 0 0 20 29 37.9 9 344 -12 6 26 20 8 18 1 5 27 47 9 17 21 -0.09 6 58 1 -47 0 0 20 29 34.5 10 344 -12 6 3 26 7 52 49 5 6 4 8 50 54 -0.09 6 35 4 -46 0 0 20 29 30.8 11 344 -12 5 41 34 7 28 46 4 45 19 8 25 42 -0.09 6 13 9 -45 0 0 20 29 26.7 12 345 -13 5 20 40 7 5 49 4 25 29 8 1 38 -0.09 5 52 11 -44 0 0 20 29 22.3 13 345 -13 5 0 40 6 43 53 4 6 29 7 38 40 -0.09 5 32 7 -43 0 0 20 29 17.5 14 345 -14 4 41 31 6 22 54 3 48 18 7 16 41 -0.09 5 12 55 -42 0 0 20 29 12.3 15 345 -14 4 23 10 6 2 49 3 30 51 6 55 40 -0.09 4 54 30 -41 0 0 20 29 6.8 16 346 -15 4 5 34 5 43 34 3 14 6 6 35 32 -0.09 4 36 49 -40 0 0 20 29 0.9 17 346 -15 3 48 41 5 25 7 2 58 1 6 16 15 -0.09 4 19 52 -39 0 0 20 28 54.7 18 346 -16 3 32 27 5 7 25 2 42 33 5 57 45 -0.09 4 3 34 -38 0 0 20 28 48.2 19 346 -16 3 16 51 4 50 24 2 27 41 5 40 0 -0.10 3 47 54 -37 0 0 20 28 41.2 20 346 -17 3 1 51 4 34 4 2 13 23 5 22 57 -0.10 3 32 50 -36 0 0 20 28 34.0 21 347 -17 2 47 25 4 18 22 1 59 36 5 6 34 -0.10 3 18 20 -35 0 0 20 28 26.4 22 347 -17 2 33 30 4 3 16 1 46 19 4 50 49 -0.10 3 4 22 -34 0 0 20 28 18.5 23 347 -18 2 20 7 3 48 43 1 33 31 4 35 39 -0.10 2 50 54 -33 0 0 20 28 10.2 24 347 -18 2 7 11 3 34 43 1 21 10 4 21 4 -0.10 2 37 56 -32 0 0 20 28 1.7 25 347 -19 1 54 44 3 21 13 1 9 15 4 7 2 -0.10 2 25 25 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14 19 54 33.1 33 101 -12 82 19 50 83 32 39 81 41 25 84 11 7 -0.03 - 78 0 0 82 57 28 19 54 31.7 33 100 -12 82 21 10 83 33 47 81 42 52 84 12 8 -0.03 - 79 0 0 82 58 35 19 54 30.3 33 99 -12 82 22 22 83 34 48 81 44 10 84 13 2 -0.03 - 80 0 0 82 59 33 19 54 29.0 33 98 -12 82 23 25 83 35 41 81 45 19 84 13 50 -0.03 - 81 0 0 83 0 23 19 54 27.6 33 97 -12 82 24 20 83 36 27 81 46 18 84 14 32 -0.03 - 82 0 0 83 1 6 19 54 26.3 32 96 -12 82 25 6 83 37 6 81 47 8 84 15 7 -0.03 - 83 0 0 83 1 41 19 54 24.9 32 95 -12 82 25 44 83 37 38 81 47 49 84 15 35 -0.03 - 84 0 0 83 2 8 19 54 23.6 32 94 -11 82 26 13 83 38 3 81 48 21 84 15 58 -0.03 - 85 0 0 83 2 27 19 54 22.3 32 93 -11 82 26 35 83 38 20 81 48 43 84 16 14 -0.03 - 86 0 0 83 2 39 19 54 21.0 32 92 -11 82 26 47 83 38 31 81 48 57 84 16 23 -0.03 - 87 0 0 83 2 43 19 54 19.6 32 91 -11 82 26 52 83 38 35 81 49 2 84 16 27 -0.03 - 88 0 0 83 2 40 19 54 18.3 32 90 -11 82 26 48 83 38 32 81 48 58 84 16 24 -0.03 - 89 0 0 83 2 29 19 54 17.0 32 89 -11 82 26 36 83 38 22 81 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.. .. .. .. .. .. 59 45 4 .. .. .. 62 31 42 .... -167 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 60 24 49 .... -168 0 0 .. .. .... .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 58 1 10 .... Uncertainty in time = +/- 13 secs Prediction of 2022 Dec 1.1 Data for the target star ------------------------ * name: UCAC4-608-013357 * constellation : Perseus * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 04 21 31.8797 DE: +31 29 32.596 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 04 21 31.8797 DE: +31 29 32.596 * position source: Gaia DR3 * 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: (588) Achilles asteroid class: approx. diameter [km]: 133 approx. diameter ["]: 0.047 distance from Earth [AU]: 3.89750 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#99 date of fit: 2022 Nov 22 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): 0.025", 0.004", 84.429° remarks: * orbital elements for (588)Achilles : Mean anomaly = 352.3507652124 deg Arg. of pericenter = 133.6720398407 deg Long. of node = 316.5355678119 deg Inclination = 10.3198442358 deg Eccentricity = 0.1482612572 Semimajor axis = 5.2095785125 AU Perihelion dist = 4.4371998528 AU Mag: H = 8.27, G = 0.15 Epoch of elements : MJD 59974.83243056 TDT (2023 Jan 30.8324) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#992022Nov22,24.20,2023,1,30,20.177032,0.034352,0.006453,0.573147,-3.057507,0.005405,0.000405,0.000001,0.000000 -6.7069,31.5482,-119.34,-17.56,False UCAC4-608-013357,4.35885548,31.4923877,0.00,12.46,0.00,0.0,0,,4.38332884,31.5482113,2.79,0.00,0,0,0 588,Achilles,15.16,133.4,3.8975,0,0,0.102,-6.90,,8.2,0 0,352.2818,2023,1,30,133.6720,316.5356,10.3198,0.14826,5.20958,4.43720,8.27,5.0,0.15 1.528,0.0250,0.0037,84,0.0249,Known errors,-1.00,-1,-1,-1 20230130_013357,59914.10 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2022 Dec 01, 02:18 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org