IOTA/IOTA-ES occultation update for (45) Eugenia / UCAC4 398-064286 event on 2023 May 09, 23:55 UT Visible from Africa Summary ------- On 2023 May 09 UT, the 206 km diameter asteroid (45) Eugenia will occult a 11.6 mag star in the constellation Scorpius for observers along a path across Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.54 mag to 11.13 mag (the magnitude of the asteroid) for at most 23.440 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: 99 * date and approx. time of event: 2023 May 09, 23:43 - 2023 May 10, 00:07 * geocentric midpoint of event [JD]: 2460074.49690921 * magnitude of target star: 11.61 * magnitude drop [mag]: 0.54 * estimated maximum duration [s]: 23.440 * Moon: 78 % sunlit, 43° distance * Sun: 161° distance * rough path description: Africa The occultation path -------------------- * approximate projected width [km]: 210 * 1 sigma uncertainty interval [path widths]: +/- 0.17 * 1 sigma uncertainty interval [seconds]: +/- 8.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.064, +/- 0.034) * 1 sigma uncertainty ellipse (major, minor, PA): (0.065", 0.032", 101°) * approx speed of asteroid's shadow [km/s]: 8.7903 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 398-064286 by 45 Eugenia #1 on 2023 May 9 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 - 73 0 0 5 26 18 0 7 22.8 + 0 101 -17 .. .. .. 4 28 15 .. .. .. 4 14 3 .... - 72 0 0 5 14 58 0 7 22.7 + 1 101 -18 6 12 53 4 16 51 6 26 59 4 2 38 0.17 - 71 0 0 5 3 18 0 7 22.4 + 2 101 -19 6 1 17 4 5 8 6 15 24 3 50 55 0.18 - 70 0 0 4 51 20 0 7 21.8 + 3 101 -20 5 49 21 3 53 6 6 3 29 3 38 52 0.19 - 69 0 0 4 39 2 0 7 21.0 + 4 101 -21 5 37 7 3 40 45 5 51 16 3 26 30 0.19 - 68 0 0 4 26 26 0 7 19.9 + 5 101 -22 5 24 34 3 28 5 5 38 44 3 13 49 0.19 - 67 0 0 4 13 31 0 7 18.6 + 6 101 -23 5 11 43 3 15 7 5 25 53 3 0 50 0.19 - 66 0 0 4 0 18 0 7 17.1 + 7 101 -24 4 58 33 3 1 51 5 12 45 2 47 33 0.20 - 65 0 0 3 46 47 0 7 15.4 + 8 101 -25 4 45 6 2 48 16 4 59 18 2 33 58 0.20 - 64 0 0 3 32 58 0 7 13.4 + 9 101 -26 4 31 21 2 34 24 4 45 34 2 20 4 0.20 - 63 0 0 3 18 52 0 7 11.2 + 10 101 -27 4 17 18 2 20 14 4 31 32 2 5 54 0.20 - 62 0 0 3 4 29 0 7 8.8 + 11 101 -28 4 2 58 2 5 47 4 17 13 1 51 26 0.20 - 61 0 0 2 49 48 0 7 6.1 + 12 101 -29 3 48 22 1 51 3 4 2 37 1 36 41 0.20 - 60 0 0 2 34 51 0 7 3.2 + 13 101 -30 3 33 28 1 36 2 3 47 45 1 21 39 0.20 - 59 0 0 2 19 38 0 7 0.1 + 14 101 -31 3 18 18 1 20 45 3 32 36 1 6 21 0.20 - 58 0 0 2 4 8 0 6 56.8 + 15 101 -32 3 2 52 1 5 12 3 17 11 0 50 47 0.20 - 57 0 0 1 48 23 0 6 53.2 + 16 101 -33 2 47 11 0 49 23 3 1 30 0 34 57 0.20 - 56 0 0 1 32 22 0 6 49.4 + 17 101 -34 2 31 13 0 33 18 2 45 33 0 18 51 0.20 - 55 0 0 1 16 6 0 6 45.4 + 18 101 -35 2 15 1 0 16 58 2 29 21 0 2 31 0.20 - 54 0 0 0 59 35 0 6 41.1 + 19 101 -36 1 58 33 0 0 24 2 12 55 - 0 14 5 0.20 - 53 0 0 0 42 49 0 6 36.6 + 20 101 -37 1 41 51 - 0 16 26 1 56 13 - 0 30 55 0.20 - 52 0 0 0 25 49 0 6 31.9 + 21 101 -38 1 24 55 - 0 33 29 1 39 18 - 0 48 0 0.20 - 51 0 0 0 8 35 0 6 27.0 + 22 101 -39 1 7 44 - 0 50 47 1 22 8 - 1 5 18 0.20 - 50 0 0 - 0 8 53 0 6 21.9 + 23 101 -40 0 50 20 - 1 8 18 1 4 45 - 1 22 50 0.20 - 49 0 0 - 0 26 34 0 6 16.5 + 24 101 -41 0 32 43 - 1 26 2 0 47 9 - 1 40 35 0.20 - 48 0 0 - 0 44 27 0 6 11.0 + 25 101 -42 0 14 52 - 1 43 59 0 29 19 - 1 58 33 0.20 - 47 0 0 - 1 2 34 0 6 5.2 + 26 101 -43 - 0 3 11 - 2 2 9 0 11 17 - 2 16 44 0.20 - 46 0 0 - 1 20 52 0 5 59.2 + 27 101 -44 - 0 21 26 - 2 20 31 - 0 6 57 - 2 35 6 0.20 - 45 0 0 - 1 39 22 0 5 53.0 + 28 101 -45 - 0 39 53 - 2 39 5 - 0 25 24 - 2 53 41 0.20 - 44 0 0 - 1 58 4 0 5 46.6 + 29 101 -46 - 0 58 31 - 2 57 50 - 0 44 1 - 3 12 27 0.20 - 43 0 0 - 2 16 57 0 5 40.0 + 30 101 -47 - 1 17 21 - 3 16 46 - 1 2 50 - 3 31 23 0.20 - 42 0 0 - 2 36 1 0 5 33.2 + 31 101 -48 - 1 36 22 - 3 35 52 - 1 21 50 - 3 50 31 0.20 - 41 0 0 - 2 55 14 0 5 26.3 + 33 101 -49 - 1 55 32 - 3 55 9 - 1 41 0 - 4 9 48 0.20 - 40 0 0 - 3 14 38 0 5 19.1 + 34 100 -50 - 2 14 53 - 4 14 36 - 2 0 20 - 4 29 16 0.20 - 39 0 0 - 3 34 11 0 5 11.7 + 35 100 -51 - 2 34 24 - 4 34 12 - 2 19 50 - 4 48 53 0.20 - 38 0 0 - 3 53 54 0 5 4.1 + 36 100 -52 - 2 54 3 - 4 53 57 - 2 39 29 - 5 8 39 0.20 - 37 0 0 - 4 13 45 0 4 56.3 + 37 100 -53 - 3 13 52 - 5 13 51 - 2 59 17 - 5 28 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-30 33 27 -32 27 54 -30 19 33 -32 41 55 0.21 99 0 0 -31 25 20 23 44 13.0 16 267 -4 -30 28 11 -32 22 41 -30 14 16 -32 36 43 0.21 100 0 0 -31 19 48 23 44 10.0 15 267 -3 -30 22 36 -32 17 10 -30 8 41 -32 31 12 0.21 101 0 0 -31 13 56 23 44 7.2 15 266 -2 -30 16 43 -32 11 21 -30 2 47 -32 25 24 0.21 102 0 0 -31 7 46 23 44 4.5 14 266 -2 -30 10 31 -32 5 14 -29 56 34 -32 19 17 0.21 103 0 0 -31 1 18 23 44 1.9 13 265 -1 -30 4 0 -31 58 48 -29 50 3 -32 12 51 0.21 104 0 0 -30 54 31 23 43 59.5 12 265 0 -29 57 11 -31 52 3 -29 43 13 -32 6 7 0.22 105 0 0 -30 47 26 23 43 57.3 11 264 1 -29 50 3 -31 45 0 -29 36 4 -31 59 5 0.22 106 0 0 -30 40 1 23 43 55.2 10 264 2 -29 42 36 -31 37 39 -29 28 37 -31 51 44 0.22 107 0 0 -30 32 18 23 43 53.3 9 263 3 -29 34 50 -31 29 58 -29 20 50 -31 44 5 0.22 108 0 0 -30 24 17 23 43 51.5 9 263 3 -29 26 46 -31 22 0 -29 12 45 -31 36 7 0.22 109 0 0 -30 15 57 23 43 49.9 8 262 4 -29 18 23 -31 13 43 -29 4 22 -31 27 50 0.22 110 0 0 -30 7 18 23 43 48.5 7 262 5 -29 9 41 -31 5 7 -28 55 39 -31 19 15 0.22 111 0 0 -29 58 21 23 43 47.2 6 261 6 -29 0 40 -30 56 13 -28 46 38 -31 10 22 0.23 112 0 0 -29 49 5 23 43 46.1 5 261 7 -28 51 21 -30 47 0 -28 37 17 -31 1 10 0.23 113 0 0 -29 39 30 23 43 45.2 4 260 8 -28 41 43 -30 37 28 -28 27 38 -30 51 39 0.24 114 0 0 -29 29 36 23 43 44.4 3 260 9 -28 31 46 -30 27 38 -28 17 41 -30 41 50 0.25 115 0 0 -29 19 24 23 43 43.9 2 259 9 -28 21 30 -30 17 30 -28 7 24 -30 31 42 0.27 116 0 0 -29 8 53 23 43 43.4 2 259 10 -28 10 56 -30 7 3 -27 56 49 -30 21 16 0.31 117 0 0 -28 58 4 23 43 43.2 1 258 11 -28 0 3 -29 56 17 -27 45 55 -30 10 31 0.46 Uncertainty in time = +/- 5 secs Prediction of 2023 Apr 29.2 Data for the target star ------------------------ * name: UCAC4 398-064286 * constellation : Scorpius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 16 20 10.4983 DE: -10 25 13.111 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 16 20 10.4983 DE: -10 25 13.111 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (45) Eugenia asteroid class: asteroid system: multiple bodies approx. diameter [km]: 206 approx. diameter ["]: 0.187 distance from Earth [AU]: 1.51980 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#128 date of fit: 2023 Apr 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): 0.036", 0.018", 101.194° remarks: * orbital elements for (45)Eugenia : Mean anomaly = 2.8230837096 deg Arg. of pericenter = 87.5262234406 deg Long. of node = 147.5896565956 deg Inclination = 6.6050490770 deg Eccentricity = 0.0833171855 Semimajor axis = 2.7207808770 AU Perihelion dist = 2.4940930721 AU Mag: H = 7.67, G = 0.07 Epoch of elements : MJD 60073.99659722 TDT (2023 May 09.9966) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1282023Apr24 Binary solution 1 : NumInt,23.44,2023,5,9,23.925821,-0.061463,-0.195876,-4.735798,1.479312,-0.001711,-0.000713,0.000002,0.000000 18.9456,-10.4775,-179.77,17.50,False UCAC4 398-064286,16.33624953,-10.4203087,0.00,11.61,0.00,0.0,0,,16.35780462,-10.4774510,0.54,0.00,0,0,0 45,Eugenia #1,11.13,206.0,1.5198,0,2,-1.858,8.56,,6.0,0 Petit-Prince,7,1164.420,4.716000,0.0020,8.00,2452980.00,5.000,138.00,201.93, S/2004 (45) 1,5,610.590,1.793000,0.1100,,2452980.00,173.000,95.00,206.67, 0,2.6042,2023,5,9,87.5262,147.5897,6.6050,0.08332,2.72078,2.49409,7.68,5.0,0.15 1.122,0.0362,0.0184,101,0.0187,Known errors + binary orbit,-1.00,-1,-1,-1 20230509_064286_Ma1,60063.18 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Apr 29, 04:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org