IOTA/IOTA-ES occultation update for (15) Eunomia / UCAC4 309-245912 event on 2023 Mar 25, 17:56 UT Visible from New Zealand, Australia Summary ------- On 2023 Mar 25 UT, the 248.3 km diameter asteroid (15) Eunomia will occult a 11.2 mag star in the constellation Sagittarius for observers along a path across New Zealand, Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.67 mag to 10.97 mag (the magnitude of the asteroid) for at most 11.410 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: 2023 Mar 25, 17:51 - 2023 Mar 25, 18:00 * geocentric midpoint of event [JD]: 2460029.24729354 * magnitude of target star: 11.15 * magnitude drop [mag]: 0.67 * estimated maximum duration [s]: 11.410 * Moon: 19 % sunlit, 131° distance * Sun: 80° distance * rough path description: New Zealand, Australia The occultation path -------------------- * approximate projected width [km]: 260 * 1 sigma uncertainty interval [path widths]: +/- 0.08 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.016, +/- 0.010) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.009", 72°) * approx speed of asteroid's shadow [km/s]: 21.7527 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 309-245912 by 15 Eunomia on 2023 Mar 25 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 93 0 0 .. .. .... .. .. .. .. .. .. -23 58 2 .. .. .. -24 10 39 .. .. .. .... 94 0 0 -23 8 23 17 51 26.6 1 120 -69 -24 31 11 -21 46 18 -24 43 48 -21 33 56 .... 95 0 0 -23 41 23 17 51 26.8 2 120 -68 -25 4 8 -22 19 21 -25 16 44 -22 6 59 0.33 96 0 0 -24 14 10 17 51 27.0 3 120 -68 -25 36 52 -22 52 12 -25 49 28 -22 39 50 0.33 97 0 0 -24 46 44 17 51 27.4 4 119 -67 -26 9 23 -23 24 50 -26 21 58 -23 12 29 0.33 98 0 0 -25 19 4 17 51 27.9 5 119 -66 -26 41 38 -23 57 14 -26 54 13 -23 44 54 0.33 99 0 0 -25 51 9 17 51 28.4 6 118 -66 -27 13 38 -24 29 24 -27 26 12 -24 17 4 0.33 100 0 0 -26 22 58 17 51 29.1 7 118 -65 -27 45 21 -25 1 18 -27 57 54 -24 48 59 0.33 101 0 0 -26 54 30 17 51 29.9 8 117 -64 -28 16 48 -25 32 56 -28 29 19 -25 20 38 0.33 102 0 0 -27 25 45 17 51 30.7 9 117 -63 -28 47 56 -26 4 17 -29 0 27 -25 52 0 0.33 103 0 0 -27 56 42 17 51 31.7 10 117 -63 -29 18 45 -26 35 21 -29 31 15 -26 23 5 0.33 104 0 0 -28 27 19 17 51 32.7 11 116 -62 -29 49 15 -27 6 5 -30 1 44 -26 53 51 0.33 105 0 0 -28 57 37 17 51 33.9 12 116 -61 -30 19 25 -27 36 31 -30 31 52 -27 24 17 0.33 106 0 0 -29 27 35 17 51 35.1 13 115 -60 -30 49 14 -28 6 37 -31 1 40 -27 54 24 0.33 107 0 0 -29 57 11 17 51 36.4 14 115 -59 -31 18 42 -28 36 22 -31 31 7 -28 24 11 0.33 108 0 0 -30 26 26 17 51 37.8 15 114 -58 -31 47 48 -29 5 46 -32 0 11 -28 53 37 0.33 109 0 0 -30 55 20 17 51 39.3 16 113 -58 -32 16 31 -29 34 49 -32 28 53 -29 22 41 0.33 110 0 0 -31 23 50 17 51 40.8 17 113 -57 -32 44 52 -30 3 29 -32 57 12 -29 51 22 0.32 111 0 0 -31 51 58 17 51 42.4 18 112 -56 -33 12 49 -30 31 47 -33 25 8 -30 19 41 0.32 112 0 0 -32 19 42 17 51 44.1 19 112 -55 -33 40 22 -30 59 41 -33 52 39 -30 47 37 0.32 113 0 0 -32 47 2 17 51 45.9 20 111 -54 -34 7 31 -31 27 12 -34 19 47 -31 15 10 0.32 114 0 0 -33 13 57 17 51 47.7 21 111 -53 -34 34 16 -31 54 19 -34 46 29 -31 42 18 0.32 115 0 0 -33 40 28 17 51 49.6 22 110 -52 -35 0 35 -32 21 1 -35 12 47 -32 9 2 0.32 116 0 0 -34 6 34 17 51 51.6 23 109 -52 -35 26 29 -32 47 19 -35 38 39 -32 35 21 0.32 117 0 0 -34 32 15 17 51 53.6 24 109 -51 -35 51 58 -33 13 11 -36 4 6 -33 1 15 0.32 118 0 0 -34 57 30 17 51 55.6 25 108 -50 -36 17 0 -33 38 38 -36 29 7 -33 26 44 0.32 119 0 0 -35 22 19 17 51 57.8 26 108 -49 -36 41 37 -34 3 39 -36 53 41 -33 51 48 0.32 120 0 0 -35 46 42 17 52 0.0 27 107 -48 -37 5 47 -34 28 15 -37 17 50 -34 16 25 0.32 121 0 0 -36 10 39 17 52 2.2 28 106 -47 -37 29 31 -34 52 24 -37 41 32 -34 40 36 0.32 122 0 0 -36 34 9 17 52 4.5 29 106 -47 -37 52 49 -35 16 7 -38 4 47 -35 4 21 0.32 123 0 0 -36 57 13 17 52 6.8 29 105 -46 -38 15 40 -35 39 24 -38 27 36 -35 27 39 0.32 124 0 0 -37 19 50 17 52 9.2 30 104 -45 -38 38 3 -36 2 14 -38 49 58 -35 50 31 0.32 125 0 0 -37 42 1 17 52 11.7 31 103 -44 -39 0 1 -36 24 37 -39 11 53 -36 12 56 0.32 126 0 0 -38 3 44 17 52 14.1 32 103 -43 -39 21 31 -36 46 33 -39 33 21 -36 34 55 0.32 127 0 0 -38 25 0 17 52 16.6 33 102 -42 -39 42 34 -37 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27 18 0 32.3 17 245 71 -18 3 23 -15 18 16 -18 16 1 -15 5 52 0.35 - 86 0 0 -16 5 50 18 0 34.0 16 244 72 -17 28 42 -14 43 43 -17 41 19 -14 31 20 0.35 - 85 0 0 -15 31 14 18 0 35.6 15 244 72 -16 54 1 -14 9 12 -17 6 38 -13 56 49 0.35 - 84 0 0 -14 56 41 18 0 37.0 14 244 73 -16 19 23 -13 34 43 -16 31 59 -13 22 22 0.35 - 83 0 0 -14 22 11 18 0 38.4 12 244 73 -15 44 47 -13 0 19 -15 57 22 -12 47 58 0.35 - 82 0 0 -13 47 46 18 0 39.7 11 243 73 -15 10 16 -12 26 0 -15 22 49 -12 13 40 0.36 - 81 0 0 -13 13 26 18 0 40.8 10 243 73 -14 35 49 -11 51 47 -14 48 22 -11 39 28 0.36 - 80 0 0 -12 39 13 18 0 41.8 9 243 73 -14 1 29 -11 17 41 -14 14 1 -11 5 23 0.37 - 79 0 0 -12 5 8 18 0 42.7 8 243 73 -13 27 16 -10 43 43 -13 39 47 -10 31 27 0.37 - 78 0 0 -11 31 12 18 0 43.5 7 242 73 -12 53 12 -10 9 55 -13 5 41 - 9 57 40 0.38 - 77 0 0 -10 57 25 18 0 44.2 6 242 73 -12 19 17 - 9 36 17 -12 31 45 - 9 24 3 0.39 - 76 0 0 -10 23 50 18 0 44.7 5 242 72 -11 45 32 - 9 2 50 -11 57 59 - 8 50 38 0.40 - 75 0 0 - 9 50 27 18 0 45.1 3 242 72 -11 12 0 - 8 29 36 -11 24 25 - 8 17 25 0.43 - 74 0 0 - 9 17 16 18 0 45.4 2 242 72 -10 38 39 - 7 56 35 -10 51 3 - 7 44 25 0.48 - 73 0 0 - 8 44 19 18 0 45.6 1 242 71 -10 5 33 - 7 23 48 -10 17 55 - 7 11 40 0.63 - 72 0 0 - 8 11 37 18 0 45.7 0 241 71 - 9 32 40 .. .. .. - 9 45 1 .. .. .. 16.30 Uncertainty in time = +/- 2 secs Prediction of 2023 Feb 15.9 Data for the target star ------------------------ * name: UCAC4 309-245912 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 05 32.1420 DE: -28 17 32.881 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 05 32.1420 DE: -28 17 32.881 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 11.2 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (15) Eunomia asteroid class: ShapeModel approx. diameter [km]: 248 approx. diameter ["]: 0.119 distance from Earth [AU]: 2.87890 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#92 date of fit: 2023 Feb 07 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): 0.016", 0.009", 71.542° remarks: * orbital elements for (15)Eunomia : Mean anomaly = 250.7307820792 deg Arg. of pericenter = 98.7219750937 deg Long. of node = 292.9075173927 deg Inclination = 11.7538512620 deg Eccentricity = 0.1870239854 Semimajor axis = 2.6429836403 AU Perihelion dist = 2.1486823064 AU Mag: H = 5.38, G = 0.23 Epoch of elements : MJD 60028.74729167 TDT (2023 Mar 25.7473) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#922023Feb07,11.41,2023,3,25,17.935045,0.043524,-0.297354,12.150688,1.762241,-0.005695,-0.000758,0.000000,0.000000 -165.2156,-28.2576,-87.53,1.92,False UCAC4 309-245912,19.09226164,-28.2924669,0.00,11.15,0.00,0.0,4,,19.11627419,-28.2576127,0.67,0.00,0,0,0 15,Eunomia,10.97,248.3,2.8789,0,0,2.810,5.39,,14.4,0 0,250.5594,2023,3,25,98.7220,292.9075,11.7539,0.18702,2.64298,2.14868,5.38,5.0,0.15 1.076,0.0163,0.0087,72,0.0090,Known errors,-1.00,-1,-1,-1 20230325_245912,59990.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Feb 15, 20:53 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org