IOTA/IOTA-ES occultation update for (15) Eunomia / UCAC4 331-180177 event on 2023 Jul 31, 01:46 UT Visible from South America Summary ------- On 2023 Jul 31 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 South America. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.08 mag to 9.31 mag (the magnitude of the asteroid) for at most 24.820 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 Jul 31, 01:35 - 2023 Jul 31, 01:57 * geocentric midpoint of event [JD]: 2460156.57374725 * magnitude of target star: 12.10 * magnitude drop [mag]: 0.08 * estimated maximum duration [s]: 24.820 * Moon: 95 % sunlit, 5° distance * Sun: 153° distance * rough path description: South America Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 249 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.027, +/- 0.016) * 1 sigma uncertainty ellipse (major, minor, PA): (0.028", 0.015", 74°) * approx speed of asteroid's shadow [km/s]: 10.0045 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 331-180177 by 15 Eunomia on 2023 Jul 31 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 -137 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 19 43 36 .. .. .. 19 28 39 .... -136 0 0 20 31 20 1 56 46.7 1 116 23 21 46 38 19 16 14 22 1 41 19 1 16 .... -135 0 0 20 3 46 1 56 46.5 2 116 22 21 19 12 18 48 30 21 34 17 18 33 30 0.01 -134 0 0 19 35 49 1 56 46.0 3 117 21 20 51 25 18 20 24 21 6 32 18 5 22 -0.03 -133 0 0 19 7 31 1 56 45.4 4 117 20 20 23 16 17 51 58 20 38 24 17 36 54 -0.05 -132 0 0 18 38 52 1 56 44.5 5 117 19 19 54 46 17 23 10 20 9 56 17 8 5 -0.06 -131 0 0 18 9 53 1 56 43.4 6 118 18 19 25 55 16 54 3 19 41 7 16 38 56 -0.07 -130 0 0 17 40 35 1 56 42.0 7 118 17 18 56 44 16 24 36 19 11 58 16 9 28 -0.08 -129 0 0 17 10 57 1 56 40.5 8 118 16 18 27 15 15 54 51 18 42 30 15 39 41 -0.08 -128 0 0 16 41 1 1 56 38.7 9 118 15 17 57 26 15 24 48 18 12 43 15 9 36 -0.08 -127 0 0 16 10 47 1 56 36.7 10 119 14 17 27 19 14 54 27 17 42 37 14 39 14 -0.09 -126 0 0 15 40 16 1 56 34.5 11 119 13 16 56 55 14 23 49 17 12 15 14 8 35 -0.09 -125 0 0 15 9 29 1 56 32.0 12 119 12 16 26 15 13 52 56 16 41 35 13 37 41 -0.09 -124 0 0 14 38 27 1 56 29.3 13 120 11 15 55 18 13 21 48 16 10 40 13 6 31 -0.09 -123 0 0 14 7 10 1 56 26.4 15 120 9 15 24 7 12 50 25 15 39 30 12 35 7 -0.09 -122 0 0 13 35 39 1 56 23.2 16 120 8 14 52 41 12 18 49 15 8 5 12 3 30 -0.09 -121 0 0 13 3 54 1 56 19.8 17 120 7 14 21 1 11 46 59 14 36 26 11 31 40 -0.09 -120 0 0 12 31 58 1 56 16.2 18 120 6 13 49 9 11 14 58 14 4 35 10 59 38 -0.09 -119 0 0 11 59 49 1 56 12.3 19 121 5 13 17 5 10 42 46 13 32 32 10 27 25 -0.10 -118 0 0 11 27 31 1 56 8.2 20 121 4 12 44 50 10 10 24 13 0 17 9 55 2 -0.10 -117 0 0 10 55 2 1 56 3.9 21 121 3 12 12 25 9 37 52 12 27 53 9 22 29 -0.10 -116 0 0 10 22 25 1 55 59.3 22 121 2 11 39 50 9 5 12 11 55 19 8 49 49 -0.10 -115 0 0 9 49 39 1 55 54.6 23 121 1 11 7 7 8 32 24 11 22 36 8 17 0 -0.10 -114 0 0 9 16 47 1 55 49.6 24 122 0 10 34 16 7 59 30 10 49 46 7 44 5 -0.10 -113 0 0 8 43 48 1 55 44.3 26 122 -1 10 1 19 7 26 29 10 16 49 7 11 5 -0.10 -112 0 0 8 10 44 1 55 38.9 27 122 -2 9 28 16 6 53 24 9 43 46 6 38 0 -0.10 -111 0 0 7 37 35 1 55 33.2 28 122 -4 8 55 8 6 20 15 9 10 39 6 4 50 -0.10 -110 0 0 7 4 24 1 55 27.3 29 122 -5 8 21 57 5 47 3 8 37 27 5 31 38 -0.10 -109 0 0 6 31 9 1 55 21.2 30 122 -6 7 48 42 5 13 49 8 4 13 4 58 24 -0.10 -108 0 0 5 57 53 1 55 14.9 31 123 -7 7 15 26 4 40 34 7 30 56 4 25 9 -0.10 -107 0 0 5 24 37 1 55 8.3 32 123 -8 6 42 8 4 7 18 6 57 38 3 51 54 -0.10 -106 0 0 4 51 21 1 55 1.6 33 123 -9 6 8 51 3 34 3 6 24 20 3 18 39 -0.10 -105 0 0 4 18 6 1 54 54.7 34 123 -10 5 35 34 3 0 50 5 51 3 2 45 26 -0.10 -104 0 0 3 44 53 1 54 47.6 36 123 -11 5 2 18 2 27 39 5 17 47 2 12 16 -0.10 -103 0 0 3 11 43 1 54 40.2 37 123 -12 4 29 6 1 54 32 4 44 34 1 39 9 -0.10 -102 0 0 2 38 37 1 54 32.7 38 123 -13 3 55 57 1 21 29 4 11 24 1 6 6 -0.10 -101 0 0 2 5 35 1 54 25.0 39 123 -14 3 22 52 0 48 31 3 38 19 0 33 9 -0.10 -100 0 0 1 32 40 1 54 17.2 40 124 -16 2 49 53 0 15 39 3 5 19 0 0 18 -0.10 - 99 0 0 0 59 51 1 54 9.1 41 124 -17 2 17 0 - 0 17 6 2 32 25 - 0 32 26 -0.10 - 98 0 0 0 27 9 1 54 0.9 42 124 -18 1 44 14 - 0 49 43 1 59 38 - 1 5 2 -0.10 - 97 0 0 - 0 5 24 1 53 52.5 43 124 -19 1 11 35 - 1 22 12 1 26 59 - 1 37 30 -0.10 - 96 0 0 - 0 37 48 1 53 44.0 44 124 -20 0 39 6 - 1 54 31 0 54 28 - 2 9 48 -0.10 - 95 0 0 - 1 10 3 1 53 35.3 46 124 -21 0 6 46 - 2 26 40 0 22 7 - 2 41 56 -0.10 - 94 0 0 - 1 42 6 1 53 26.4 47 124 -22 - 0 25 24 - 2 58 38 - 0 10 3 - 3 13 53 -0.10 - 93 0 0 - 2 13 59 1 53 17.5 48 124 -23 - 0 57 22 - 3 30 24 - 0 42 3 - 3 45 38 -0.10 - 92 0 0 - 2 45 39 1 53 8.3 49 124 -24 - 1 29 8 - 4 1 57 - 1 13 51 - 4 17 10 -0.10 - 91 0 0 - 3 17 6 1 52 59.1 50 124 -25 - 2 0 42 - 4 33 18 - 1 45 26 - 4 48 29 -0.10 - 90 0 0 - 3 48 19 1 52 49.7 51 124 -26 - 2 32 3 - 5 4 24 - 2 16 48 - 5 19 34 -0.10 - 89 0 0 - 4 19 18 1 52 40.2 52 124 -27 - 3 3 9 - 5 35 16 - 2 47 56 - 5 50 25 -0.10 - 88 0 0 - 4 50 2 1 52 30.6 53 124 -29 - 3 34 0 - 6 5 53 - 3 18 49 - 6 21 0 -0.10 - 87 0 0 - 5 20 30 1 52 20.9 54 125 -30 - 4 4 36 - 6 36 14 - 3 49 26 - 6 51 19 -0.10 - 86 0 0 - 5 50 42 1 52 11.0 55 125 -31 - 4 34 56 - 7 6 18 - 4 19 48 - 7 21 22 -0.10 - 85 0 0 - 6 20 38 1 52 1.1 56 125 -32 - 5 5 0 - 7 36 5 - 4 49 53 - 7 51 7 -0.09 - 84 0 0 - 6 50 15 1 51 51.1 57 125 -33 - 5 34 45 - 8 5 34 - 5 19 40 - 8 20 35 -0.09 - 83 0 0 - 7 19 34 1 51 41.0 58 125 -34 - 6 4 13 - 8 34 45 - 5 49 10 - 8 49 44 -0.09 - 82 0 0 - 7 48 35 1 51 30.8 59 125 -35 - 6 33 23 - 9 3 37 - 6 18 21 - 9 18 35 -0.09 - 81 0 0 - 8 17 17 1 51 20.6 61 125 -36 - 7 2 13 - 9 32 10 - 6 47 13 - 9 47 6 -0.09 - 80 0 0 - 8 45 39 1 51 10.2 62 125 -37 - 7 30 44 -10 0 23 - 7 15 46 -10 15 17 -0.09 - 79 0 0 - 9 13 41 1 50 59.8 63 126 -38 - 7 58 55 -10 28 16 - 7 43 59 -10 43 8 -0.09 - 78 0 0 - 9 41 22 1 50 49.4 64 126 -39 - 8 26 46 -10 55 48 - 8 11 51 -11 10 38 -0.09 - 77 0 0 -10 8 42 1 50 38.9 65 126 -40 - 8 54 15 -11 22 59 - 8 39 22 -11 37 47 -0.09 - 76 0 0 -10 35 41 1 50 28.3 66 126 -41 - 9 21 23 -11 49 48 - 9 6 32 -12 4 35 -0.09 - 75 0 0 -11 2 17 1 50 17.7 67 127 -42 - 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2 0 0 -24 15 31 1 38 43.0 45 260 -69 -23 7 38 -25 23 16 -22 54 5 -25 36 46 -0.09 - 1 0 0 -24 10 4 1 38 36.0 44 259 -69 -23 2 8 -25 17 52 -22 48 34 -25 31 23 -0.09 0 0 0 -24 4 10 1 38 29.1 43 259 -68 -22 56 11 -25 12 2 -22 42 35 -25 25 34 -0.09 1 0 0 -23 57 49 1 38 22.4 42 259 -67 -22 49 46 -25 5 45 -22 36 10 -25 19 17 -0.09 2 0 0 -23 51 1 1 38 15.7 41 258 -66 -22 42 53 -24 59 0 -22 29 16 -25 12 34 -0.09 3 0 0 -23 43 45 1 38 9.2 40 258 -65 -22 35 33 -24 51 49 -22 21 55 -25 5 24 -0.09 4 0 0 -23 36 2 1 38 2.7 39 258 -64 -22 27 45 -24 44 11 -22 14 6 -24 57 46 -0.09 5 0 0 -23 27 51 1 37 56.4 39 257 -63 -22 19 29 -24 36 5 -22 5 50 -24 49 42 -0.09 6 0 0 -23 19 13 1 37 50.1 38 257 -63 -22 10 46 -24 27 33 -21 57 5 -24 41 10 -0.09 7 0 0 -23 10 8 1 37 44.0 37 257 -62 -22 1 35 -24 18 32 -21 47 53 -24 32 11 -0.09 8 0 0 -23 0 34 1 37 38.0 36 256 -61 -21 51 56 -24 9 5 -21 38 13 -24 22 44 -0.09 9 0 0 -22 50 33 1 37 32.1 35 256 -60 -21 41 48 -23 59 10 -21 28 4 -24 12 50 -0.09 10 0 0 -22 40 4 1 37 26.3 34 256 -59 -21 31 13 -23 48 47 -21 17 27 -24 2 29 -0.09 11 0 0 -22 29 7 1 37 20.6 33 255 -58 -21 20 9 -23 37 56 -21 6 23 -23 51 40 -0.09 12 0 0 -22 17 42 1 37 15.0 32 255 -57 -21 8 38 -23 26 38 -20 54 49 -23 40 23 -0.09 13 0 0 -22 5 49 1 37 9.6 31 255 -56 -20 56 37 -23 14 52 -20 42 48 -23 28 38 -0.09 14 0 0 -21 53 28 1 37 4.3 30 254 -55 -20 44 9 -23 2 38 -20 30 18 -23 16 26 -0.09 15 0 0 -21 40 38 1 36 59.1 29 254 -55 -20 31 12 -22 49 56 -20 17 19 -23 3 45 -0.09 16 0 0 -21 27 20 1 36 54.0 28 254 -54 -20 17 46 -22 36 46 -20 3 52 -22 50 37 -0.09 17 0 0 -21 13 34 1 36 49.1 27 253 -53 -20 3 52 -22 23 8 -19 49 56 -22 37 0 -0.09 18 0 0 -20 59 20 1 36 44.3 27 253 -52 -19 49 29 -22 9 2 -19 35 31 -22 22 55 -0.09 19 0 0 -20 44 36 1 36 39.6 26 253 -51 -19 34 37 -21 54 27 -19 20 38 -22 8 22 -0.09 20 0 0 -20 29 25 1 36 35.1 25 252 -50 -19 19 17 -21 39 24 -19 5 16 -21 53 21 -0.09 21 0 0 -20 13 44 1 36 30.7 24 252 -49 -19 3 27 -21 23 52 -18 49 25 -21 37 51 -0.09 22 0 0 -19 57 35 1 36 26.5 23 252 -48 -18 47 9 -21 7 52 -18 33 4 -21 21 53 -0.09 23 0 0 -19 40 57 1 36 22.4 22 251 -47 -18 30 22 -20 51 24 -18 16 15 -21 5 26 -0.09 24 0 0 -19 23 51 1 36 18.5 21 251 -46 -18 13 6 -20 34 27 -17 58 57 -20 48 31 -0.10 25 0 0 -19 6 15 1 36 14.7 20 251 -45 -17 55 21 -20 17 1 -17 41 10 -20 31 7 -0.10 26 0 0 -18 48 11 1 36 11.1 19 250 -44 -17 37 6 -19 59 7 -17 22 54 -20 13 15 -0.10 27 0 0 -18 29 38 1 36 7.6 18 250 -43 -17 18 23 -19 40 44 -17 4 9 -19 54 54 -0.10 28 0 0 -18 10 36 1 36 4.3 17 250 -42 -16 59 11 -19 21 52 -16 44 55 -19 36 4 -0.10 29 0 0 -17 51 6 1 36 1.2 16 249 -41 -16 39 30 -19 2 32 -16 25 12 -19 16 46 -0.10 30 0 0 -17 31 6 1 35 58.2 15 249 -40 -16 19 20 -18 42 43 -16 4 59 -18 56 59 -0.10 31 0 0 -17 10 38 1 35 55.5 14 249 -39 -15 58 41 -18 22 25 -15 44 18 -18 36 44 -0.10 32 0 0 -16 49 41 1 35 52.9 13 249 -38 -15 37 33 -18 1 39 -15 23 8 -18 16 0 -0.10 33 0 0 -16 28 16 1 35 50.4 12 248 -37 -15 15 57 -17 40 24 -15 1 29 -17 54 47 -0.10 34 0 0 -16 6 21 1 35 48.2 11 248 -36 -14 53 51 -17 18 41 -14 39 22 -17 33 6 -0.09 35 0 0 -15 43 59 1 35 46.1 10 248 -35 -14 31 17 -16 56 30 -14 16 46 -17 10 57 -0.09 36 0 0 -15 21 8 1 35 44.3 9 247 -34 -14 8 15 -16 33 50 -13 53 41 -16 48 19 -0.09 37 0 0 -14 57 48 1 35 42.6 8 247 -33 -13 44 44 -16 10 42 -13 30 8 -16 25 13 -0.09 38 0 0 -14 34 1 1 35 41.1 7 247 -32 -13 20 45 -15 47 6 -13 6 7 -16 1 40 -0.09 39 0 0 -14 9 46 1 35 39.9 6 247 -31 -12 56 18 -15 23 2 -12 41 38 -15 37 38 -0.09 40 0 0 -13 45 2 1 35 38.8 5 246 -30 -12 31 24 -14 58 30 -12 16 40 -15 13 8 -0.09 41 0 0 -13 19 52 1 35 38.0 4 246 -29 -12 6 1 -14 33 31 -11 51 16 -14 48 12 -0.08 42 0 0 -12 54 14 1 35 37.3 2 246 -28 -11 40 12 -14 8 4 -11 25 24 -14 22 47 -0.07 43 0 0 -12 28 9 1 35 36.9 1 246 -27 -11 13 55 -13 42 11 -10 59 5 -13 56 56 -0.05 44 0 0 -12 1 37 1 35 36.7 0 246 -26 .. .. .. -13 15 50 .. .. .. -13 30 38 0.13 Uncertainty in time = +/- 3 secs Prediction of 2023 May 29.0 Data for the target star ------------------------ * name: UCAC4 331-180177 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 43 55.2277 DE: -23 57 06.005 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 43 55.2277 DE: -23 57 06.005 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * 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 ["]: 0.201 distance from Earth [AU]: 1.70640 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#93 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): 0.028", 0.015", 73.741° remarks: * orbital elements for (15)Eunomia : Mean anomaly = 279.9180544443 deg Arg. of pericenter = 98.7476257733 deg Long. of node = 292.9064734676 deg Inclination = 11.7545507594 deg Eccentricity = 0.1870797254 Semimajor axis = 2.6427701968 AU Perihelion dist = 2.1483614741 AU Mag: H = 5.38, G = 0.23 Epoch of elements : MJD 60156.07368056 TDT (2023 Jul 31.0737) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#932023Apr24,24.82,2023,7,31,1.769934,0.026179,0.081325,-5.375552,1.729253,0.002514,0.000277,0.000001,0.000000 -53.6400,-23.9282,155.07,18.36,False UCAC4 331-180177,18.73200772,-23.9516680,0.00,12.10,0.00,0.0,0,,18.75619139,-23.9281739,0.08,0.00,0,0,0 15,Eunomia,9.31,248.3,1.7064,0,0,-2.019,8.91,,14.4,0 0,279.6717,2023,7,30,98.7476,292.9065,11.7546,0.18708,2.64277,2.14836,5.38,5.0,0.15 1.100,0.0280,0.0150,74,0.0200,Known errors,-1.00,-1,-1,-1 20230731_180177,60092.99 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 28, 23:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org