IOTA/IOTA-ES occultation update for (15) Eunomia / UCAC4 344-156213 event on 2023 Sep 13, 13:24 UT Visible from Australia Summary ------- On 2023 Sep 13 UT, the 248.3 km diameter asteroid (15) Eunomia will occult a 12.1 mag star in the constellation Sagittarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.15 mag to 10.05 mag (the magnitude of the asteroid) for at most 33.480 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 Sep 13, 13:10 - 2023 Sep 13, 13:36 * geocentric midpoint of event [JD]: 2460201.05815125 * magnitude of target star: 12.14 * magnitude drop [mag]: 0.15 * estimated maximum duration [s]: 33.480 * Moon: 2 % sunlit, 125° distance * Sun: 108° distance * rough path description: Australia Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 289 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 1.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.006, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.006", 0.003", 73°) * approx speed of asteroid's shadow [km/s]: 7.4155 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 344-156213 by 15 Eunomia on 2023 Sep 13 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 - 33 0 0 .. .. .... .. .. .. .. .. .. -54 25 19 .. .. .. -54 28 55 .. .. .. .... - 32 0 0 .. .. .... .. .. .. .. .. .. -54 52 28 .. .. .. -54 56 3 .. .. .. .... - 31 0 0 -53 39 6 13 11 28.0 1 126 32 -55 19 0 .. .. .. -55 22 33 .. .. .. .... - 30 0 1 -54 5 29 13 11 28.3 1 125 32 -55 44 54 -52 28 10 -55 48 26 -52 24 46 0.60 - 29 0 1 -54 31 16 13 11 28.7 2 125 31 -56 10 10 -52 54 24 -56 13 41 -52 51 2 0.61 - 28 0 1 -54 56 27 13 11 29.3 3 124 31 -56 34 51 -53 20 3 -56 38 21 -53 16 41 0.61 - 27 0 1 -55 21 1 13 11 30.0 4 123 31 -56 58 54 -53 45 5 -57 2 23 -53 41 45 0.62 - 26 0 1 -55 44 59 13 11 30.9 4 122 30 -57 22 22 -54 9 33 -57 25 50 -54 6 13 0.62 - 25 0 1 -56 8 22 13 11 31.9 5 121 30 -57 45 14 -54 33 25 -57 48 41 -54 30 6 0.62 - 24 0 1 -56 31 10 13 11 33.0 6 120 30 -58 7 31 -54 56 41 -58 10 56 -54 53 24 0.62 - 23 0 1 -56 53 22 13 11 34.3 6 120 29 -58 29 12 -55 19 24 -58 32 37 -55 16 7 0.62 - 22 0 1 -57 15 1 13 11 35.6 7 119 29 -58 50 19 -55 41 31 -58 53 43 -55 38 16 0.62 - 21 0 1 -57 36 5 13 11 37.1 8 118 29 -59 10 53 -56 3 5 -59 14 15 -55 59 51 0.62 - 20 0 1 -57 56 36 13 11 38.7 8 117 28 -59 30 52 -56 24 6 -59 34 13 -56 20 52 0.62 - 19 0 1 -58 16 34 13 11 40.3 9 116 28 -59 50 19 -56 44 33 -59 53 39 -56 41 20 0.62 - 18 0 1 -58 35 59 13 11 42.1 10 115 28 -60 9 13 -57 4 27 -60 12 32 -57 1 16 0.62 - 17 0 1 -58 54 52 13 11 43.9 10 114 27 -60 27 35 -57 23 49 -60 30 53 -57 20 39 0.62 - 16 0 1 -59 13 13 13 11 45.9 11 114 27 -60 45 26 -57 42 39 -60 48 42 -57 39 30 0.62 - 15 0 1 -59 31 3 13 11 47.9 11 113 27 -61 2 46 -58 0 57 -61 6 1 -57 57 49 0.62 - 14 0 1 -59 48 22 13 11 50.0 12 112 26 -61 19 35 -58 18 45 -61 22 49 -58 15 37 0.62 - 13 0 1 -60 5 11 13 11 52.1 12 111 26 -61 35 54 -58 36 2 -61 39 7 -58 32 55 0.62 - 12 0 1 -60 21 30 13 11 54.4 13 110 26 -61 51 44 -58 52 48 -61 54 56 -58 49 43 0.62 - 11 0 1 -60 37 19 13 11 56.6 14 109 25 -62 7 4 -59 9 5 -62 10 15 -59 6 1 0.62 - 10 0 1 -60 52 40 13 11 59.0 14 108 25 -62 21 57 -59 24 53 -62 25 7 -59 21 49 0.62 - 9 0 1 -61 7 32 13 12 1.4 15 107 25 -62 36 21 -59 40 12 -62 39 30 -59 37 9 0.61 - 8 0 1 -61 21 57 13 12 3.9 15 106 24 -62 50 18 -59 55 3 -62 53 26 -59 52 1 0.61 - 7 0 1 -61 35 54 13 12 6.4 16 106 24 -63 3 49 -60 9 25 -63 6 56 -60 6 24 0.61 - 6 0 1 -61 49 24 13 12 9.0 16 105 24 -63 16 52 -60 23 21 -63 19 58 -60 20 21 0.61 - 5 0 1 -62 2 28 13 12 11.6 17 104 23 -63 29 30 -60 36 49 -63 32 35 -60 33 50 0.61 - 4 0 1 -62 15 5 13 12 14.3 17 103 23 -63 41 42 -60 49 51 -63 44 46 -60 46 52 0.61 - 3 0 1 -62 27 17 13 12 17.0 18 102 23 -63 53 29 -61 2 26 -63 56 32 -60 59 29 0.61 - 2 0 1 -62 39 4 13 12 19.8 18 101 22 -64 4 52 -61 14 36 -64 7 54 -61 11 39 0.61 - 1 0 1 -62 50 26 13 12 22.6 19 100 22 -64 15 50 -61 26 21 -64 18 51 -61 23 25 0.61 - 0 0 1 -63 1 23 13 12 25.5 19 99 22 -64 26 24 -61 37 40 -64 29 25 -61 34 45 0.61 0 59 59 -63 11 57 13 12 28.4 20 98 21 -64 36 35 -61 48 35 -64 39 35 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59 59 -64 55 29 13 13 9.2 26 86 17 -66 16 16 -63 35 51 -66 19 8 -63 33 4 0.60 14 59 59 -65 1 2 13 13 12.5 26 85 17 -66 21 36 -63 41 36 -66 24 27 -63 38 50 0.60 15 59 59 -65 6 16 13 13 15.9 26 84 17 -66 26 37 -63 47 1 -66 29 27 -63 44 15 0.60 16 59 59 -65 11 10 13 13 19.4 27 83 16 -66 31 19 -63 52 7 -66 34 9 -63 49 21 0.60 17 59 59 -65 15 45 13 13 22.8 27 82 16 -66 35 43 -63 56 53 -66 38 33 -63 54 7 0.60 18 59 59 -65 20 1 13 13 26.3 28 81 16 -66 39 49 -64 1 19 -66 42 38 -63 58 34 0.60 19 59 59 -65 23 58 13 13 29.9 28 80 15 -66 43 36 -64 5 26 -66 46 26 -64 2 41 0.60 20 59 59 -65 27 37 13 13 33.4 28 79 15 -66 47 6 -64 9 13 -66 49 55 -64 6 29 0.60 21 59 59 -65 30 57 13 13 37.0 29 78 15 -66 50 18 -64 12 41 -66 53 7 -64 9 57 0.60 22 59 59 -65 33 59 13 13 40.6 29 77 14 -66 53 13 -64 15 51 -66 56 1 -64 13 7 0.60 23 59 59 -65 36 43 13 13 44.3 30 76 14 -66 55 49 -64 18 41 -66 58 38 -64 15 58 0.60 24 59 59 -65 39 9 13 13 48.0 30 75 14 -66 58 9 -64 21 13 -67 0 57 -64 18 30 0.60 25 59 59 -65 41 17 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-58 43 0 -55 34 20 -58 46 23 -55 31 5 0.60 87 59 59 -56 45 11 13 19 58.1 54 358 -13 -58 20 59 -55 11 10 -58 24 23 -55 7 54 0.60 88 59 59 -56 21 56 13 20 8.0 55 357 -14 -57 58 19 -54 47 22 -58 1 45 -54 44 4 0.60 89 59 59 -55 58 1 13 20 18.2 55 355 -15 -57 35 0 -54 22 54 -57 38 27 -54 19 35 0.60 90 59 59 -55 33 27 13 20 28.5 56 353 -15 -57 11 1 -53 57 46 -57 14 29 -53 54 26 0.60 91 59 59 -55 8 11 13 20 39.1 56 351 -16 -56 46 21 -53 31 56 -56 49 50 -53 28 35 0.60 92 59 59 -54 42 14 13 20 49.9 56 349 -17 -56 21 0 -53 5 26 -56 24 30 -53 2 4 0.60 93 59 59 -54 15 36 13 21 0.9 57 348 -18 -55 54 57 -52 38 14 -55 58 28 -52 34 51 0.60 94 59 59 -53 48 15 13 21 12.1 57 346 -18 -55 28 11 -52 10 19 -55 31 44 -52 6 55 0.60 95 59 59 -53 20 11 13 21 23.6 57 344 -19 -55 0 42 -51 41 42 -55 4 17 -51 38 17 0.60 96 59 59 -52 51 24 13 21 35.3 57 342 -20 -54 32 30 -51 12 22 -54 36 6 -51 8 56 0.60 97 59 59 -52 21 53 13 21 47.2 58 340 -21 -54 3 34 -50 42 19 -54 7 10 -50 38 51 0.60 98 59 59 -51 51 38 13 21 59.4 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54 284 -45 -38 4 55 -34 27 55 -38 8 50 -34 24 12 0.62 124 0 0 -35 29 0 13 28 9.2 53 282 -46 -37 18 46 -33 41 54 -37 22 41 -33 38 11 0.62 125 0 0 -34 42 36 13 28 25.5 52 280 -47 -36 32 16 -32 55 37 -36 36 11 -32 51 54 0.62 126 0 0 -33 55 56 13 28 41.7 52 278 -48 -35 45 28 -32 9 5 -35 49 22 -32 5 22 0.62 127 0 0 -33 9 2 13 28 57.9 51 276 -50 -34 58 23 -31 22 21 -35 2 17 -31 18 38 0.62 128 0 0 -32 21 56 13 29 14.0 50 275 -51 -34 11 5 -30 35 27 -34 14 58 -30 31 45 0.62 129 0 0 -31 34 42 13 29 30.0 49 273 -52 -33 23 36 -29 48 27 -33 27 29 -29 44 45 0.63 130 0 0 -30 47 21 13 29 45.9 48 272 -53 -32 35 59 -29 1 22 -32 39 51 -28 57 41 0.63 131 0 0 -29 59 57 13 30 1.6 47 270 -54 -31 48 16 -28 14 15 -31 52 8 -28 10 35 0.63 132 0 0 -29 12 31 13 30 17.2 46 269 -56 -31 0 30 -27 27 9 -31 4 21 -27 23 29 0.63 133 0 0 -28 25 7 13 30 32.6 46 268 -57 -30 12 45 -26 40 6 -30 16 35 -26 36 27 0.63 134 0 0 -27 37 47 13 30 47.8 45 266 -58 -29 25 1 -25 53 8 -29 28 50 -25 49 30 0.63 135 0 0 -26 50 34 13 31 2.7 44 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-83 -11 32 41 - 8 27 52 -11 36 0 - 8 24 41 0.66 160 0 0 - 9 24 56 13 35 24.9 16 250 -83 -10 57 41 - 7 53 57 -11 0 59 - 7 50 47 0.67 161 0 0 - 8 51 14 13 35 30.1 14 250 -82 -10 23 26 - 7 20 46 -10 26 43 - 7 17 37 0.67 162 0 0 - 8 18 16 13 35 34.9 13 250 -82 - 9 49 56 - 6 48 19 - 9 53 11 - 6 45 11 0.67 163 0 0 - 7 46 3 13 35 39.3 12 250 -81 - 9 17 11 - 6 16 37 - 9 20 25 - 6 13 30 0.67 164 0 0 - 7 14 36 13 35 43.3 11 250 -80 - 8 45 12 - 5 45 38 - 8 48 25 - 5 42 32 0.68 165 0 0 - 6 43 53 13 35 46.9 10 249 -80 - 8 13 59 - 5 15 25 - 8 17 11 - 5 12 20 0.68 166 0 0 - 6 13 56 13 35 50.1 9 249 -79 - 7 43 31 - 4 45 56 - 7 46 42 - 4 42 52 0.69 167 0 0 - 5 44 44 13 35 52.9 8 249 -78 - 7 13 50 - 4 17 12 - 7 17 0 - 4 14 9 0.70 168 0 0 - 5 16 17 13 35 55.3 7 249 -77 - 6 44 55 - 3 49 12 - 6 48 3 - 3 46 10 0.71 169 0 0 - 4 48 36 13 35 57.3 5 249 -76 - 6 16 46 - 3 21 58 - 6 19 53 - 3 18 57 0.72 170 0 0 - 4 21 40 13 35 58.9 4 249 -75 - 5 49 23 - 2 55 28 - 5 52 29 - 2 52 28 0.74 171 0 0 - 3 55 30 13 36 0.2 3 249 -74 - 5 22 46 - 2 29 43 - 5 25 51 - 2 26 44 0.78 172 0 0 - 3 30 5 13 36 1.1 2 249 -73 - 4 56 55 - 2 4 43 - 5 0 0 - 2 1 44 0.85 173 0 0 - 3 5 25 13 36 1.6 1 249 -72 - 4 31 50 - 1 40 27 - 4 34 54 - 1 37 29 1.06 174 0 0 - 2 41 31 13 36 1.8 0 249 -71 - 4 7 31 .. .. .. - 4 10 34 .. .. .. 29.52 Uncertainty in time = +/- 1 secs Prediction of 2023 Aug 27.0 Data for the target star ------------------------ * name: UCAC4 344-156213 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 35 40.1572 DE: -21 17 27.557 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 35 40.1570 DE: -21 17 27.557 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.200) * V mag [mag]: 12.1 * 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 ["]: 0.166 distance from Earth [AU]: 2.06250 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#95 date of fit: 2023 Aug 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): 0.006", 0.003", 73.068° remarks: * orbital elements for (15)Eunomia : Mean anomaly = 290.1136423003 deg Arg. of pericenter = 98.7601559165 deg Long. of node = 292.9065264197 deg Inclination = 11.7548551491 deg Eccentricity = 0.1871008915 Semimajor axis = 2.6426750289 AU Perihelion dist = 2.1482281751 AU Mag: H = 5.41, G = 0.23 Epoch of elements : MJD 60200.55833333 TDT (2023 Sep 13.5583) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#952023Aug22,33.48,2023,9,13,13.395630,0.241636,-0.453006,3.694364,1.967258,0.005329,0.000282,0.000000,0.000000 86.0573,-21.2724,-21.93,3.76,False UCAC4 344-156213,18.59448813,-21.2909881,0.00,12.14,0.00,0.0,0,,18.61810240,-21.2723765,0.15,0.00,0,0,0 15,Eunomia,10.05,248.300,2.0625,0,0,1.127,8.39,,14.4,0 0,289.9855,2023,9,13,98.7602,292.9065,11.7549,0.18710,2.64268,2.14823,5.38,5.0,0.15 1.018,0.0063,0.0027,73,0.0069,Known errors,-1.00,0,-1,-1 20230913_156213,60182.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Aug 26, 23:44 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org