IOTA/IOTA-ES occultation update for (15) Eunomia / UCAC4 328-179757 event on 2023 Jul 19, 16:34 UT Visible from S Australia, Africa Summary ------- On 2023 Jul 19 UT, the 248.3 km diameter asteroid (15) Eunomia will occult a 12.0 mag star in the constellation Sagittarius for observers along a path across S Australia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.07 mag to 9.07 mag (the magnitude of the asteroid) for at most 20.770 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 19, 16:25 - 2023 Jul 19, 16:43 * geocentric midpoint of event [JD]: 2460145.19064446 * magnitude of target star: 12.00 * magnitude drop [mag]: 0.07 * estimated maximum duration [s]: 20.770 * Moon: 3 % sunlit, 145° distance * Sun: 166° distance * rough path description: S Australia, Africa Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 250 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 2.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.028, +/- 0.017) * 1 sigma uncertainty ellipse (major, minor, PA): (0.029", 0.015", 73°) * approx speed of asteroid's shadow [km/s]: 11.9569 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 328-179757 by 15 Eunomia on 2023 Jul 19 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 8 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 3 34 30 .. .. .. 3 20 12 .... 9 0 0 4 21 28 16 43 20.4 1 115 13 5 36 5 3 6 38 5 50 20 2 52 18 .... 10 0 0 3 53 27 16 43 20.2 2 115 11 5 8 11 2 38 30 5 22 27 2 24 8 0.15 11 0 0 3 25 10 16 43 19.7 3 115 10 4 40 1 2 10 5 4 54 19 1 55 43 0.14 12 0 0 2 56 37 16 43 19.0 4 115 9 4 11 36 1 41 26 4 25 54 1 27 2 0.13 13 0 0 2 27 50 16 43 18.1 5 115 8 3 42 55 1 12 33 3 57 15 0 58 8 0.13 14 0 0 1 58 50 16 43 17.1 7 115 7 3 14 1 0 43 26 3 28 22 0 28 59 0.13 15 0 0 1 29 36 16 43 15.8 8 115 6 2 44 53 0 14 6 2 59 15 - 0 0 21 0.13 16 0 0 1 0 10 16 43 14.3 9 115 5 2 15 33 - 0 15 26 2 29 56 - 0 29 54 0.12 17 0 0 0 30 33 16 43 12.6 10 115 4 1 46 1 - 0 45 9 2 0 25 - 0 59 38 0.12 18 0 0 0 0 44 16 43 10.8 11 115 3 1 16 18 - 1 15 2 1 30 43 - 1 29 33 0.12 19 0 0 - 0 29 14 16 43 8.7 12 115 2 0 46 24 - 1 45 5 1 0 51 - 1 59 37 0.12 20 0 0 - 0 59 22 16 43 6.4 13 115 0 0 16 21 - 2 15 17 0 30 48 - 2 29 50 0.12 21 0 0 - 1 29 37 16 43 3.9 14 115 -1 - 0 13 50 - 2 45 37 0 0 38 - 3 0 11 0.12 22 0 0 - 2 0 1 16 43 1.3 15 115 -2 - 0 44 10 - 3 16 5 - 0 29 41 - 3 30 39 0.12 23 0 0 - 2 30 31 16 42 58.4 16 115 -3 - 1 14 37 - 3 46 38 - 1 0 7 - 4 1 13 0.12 24 0 0 - 3 1 7 16 42 55.4 18 115 -4 - 1 45 10 - 4 17 18 - 1 30 40 - 4 31 53 0.12 25 0 0 - 3 31 49 16 42 52.1 19 115 -5 - 2 15 48 - 4 48 2 - 2 1 17 - 5 2 38 0.12 26 0 0 - 4 2 34 16 42 48.7 20 115 -6 - 2 46 31 - 5 18 50 - 2 32 0 - 5 33 27 0.12 27 0 0 - 4 33 23 16 42 45.1 21 115 -7 - 3 17 18 - 5 49 42 - 3 2 46 - 6 4 18 0.12 28 0 0 - 5 4 15 16 42 41.3 22 114 -8 - 3 48 8 - 6 20 35 - 3 33 36 - 6 35 12 0.12 29 0 0 - 5 35 8 16 42 37.3 23 114 -9 - 4 19 0 - 6 51 30 - 4 4 27 - 7 6 8 0.12 30 0 0 - 6 6 3 16 42 33.1 24 114 -11 - 4 49 53 - 7 22 26 - 4 35 20 - 7 37 3 0.12 31 0 0 - 6 36 57 16 42 28.8 25 114 -12 - 5 20 46 - 7 53 21 - 5 6 14 - 8 7 59 0.12 32 0 0 - 7 7 51 16 42 24.3 26 114 -13 - 5 51 40 - 8 24 15 - 5 37 7 - 8 38 53 0.12 33 0 0 - 7 38 43 16 42 19.6 28 114 -14 - 6 22 32 - 8 55 8 - 6 7 59 - 9 9 46 0.12 34 0 0 - 8 9 33 16 42 14.7 29 114 -15 - 6 53 22 - 9 25 57 - 6 38 49 - 9 40 35 0.12 35 0 0 - 8 40 20 16 42 9.7 30 113 -16 - 7 24 9 - 9 56 43 - 7 9 37 -10 11 21 0.12 36 0 0 - 9 11 2 16 42 4.6 31 113 -17 - 7 54 53 -10 27 25 - 7 40 21 -10 42 3 0.12 37 0 0 - 9 41 40 16 41 59.2 32 113 -18 - 8 25 32 -10 58 2 - 8 11 0 -11 12 40 0.12 38 0 0 -10 12 13 16 41 53.8 33 113 -19 - 8 56 6 -11 28 33 - 8 41 34 -11 43 10 0.12 39 0 0 -10 42 39 16 41 48.1 34 113 -20 - 9 26 34 -11 58 57 - 9 12 3 -12 13 34 0.12 40 0 0 -11 12 58 16 41 42.4 35 112 -21 - 9 56 55 -12 29 14 - 9 42 25 -12 43 50 0.12 41 0 0 -11 43 9 16 41 36.4 36 112 -22 -10 27 9 -12 59 23 -10 12 39 -13 13 59 0.12 42 0 0 -12 13 12 16 41 30.4 37 112 -24 -10 57 15 -13 29 22 -10 42 45 -13 43 58 0.12 43 0 0 -12 43 5 16 41 24.2 38 111 -25 -11 27 11 -13 59 13 -11 12 42 -14 13 47 0.12 44 0 0 -13 12 49 16 41 17.9 39 111 -26 -11 56 58 -14 28 52 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26 19.0 21 252 -33 -25 43 51 -28 8 25 -25 30 4 -28 22 17 0.13 179 0 0 -26 35 49 16 26 15.9 20 252 -32 -25 23 28 -27 48 21 -25 9 40 -28 2 15 0.13 180 0 0 -26 15 11 16 26 12.9 19 251 -31 -25 2 41 -27 27 52 -24 48 51 -27 41 47 0.13 -179 0 0 -25 54 8 16 26 10.0 18 251 -30 -24 41 29 -27 6 59 -24 27 37 -27 20 56 0.13 -178 0 0 -25 32 42 16 26 7.3 17 250 -29 -24 19 53 -26 45 42 -24 5 59 -26 59 41 0.13 -177 0 0 -25 10 51 16 26 4.6 16 250 -28 -23 57 53 -26 24 0 -23 43 57 -26 38 1 0.13 -176 0 0 -24 48 36 16 26 2.2 15 250 -27 -23 35 29 -26 1 55 -23 21 32 -26 15 57 0.13 -175 0 0 -24 25 57 16 25 59.8 14 249 -26 -23 12 41 -25 39 26 -22 58 42 -25 53 30 0.13 -174 0 0 -24 2 55 16 25 57.6 13 249 -25 -22 49 30 -25 16 33 -22 35 29 -25 30 39 0.13 -173 0 0 -23 39 30 16 25 55.5 12 248 -24 -22 25 55 -24 53 16 -22 11 52 -25 7 24 0.13 -172 0 0 -23 15 41 16 25 53.6 11 248 -23 -22 1 57 -24 29 37 -21 47 52 -24 43 46 0.14 -171 0 0 -22 51 29 16 25 51.8 10 248 -22 -21 37 36 -24 5 34 -21 23 30 -24 19 45 0.14 -170 0 0 -22 26 54 16 25 50.2 9 247 -21 -21 12 53 -23 41 8 -20 58 45 -23 55 21 0.14 -169 0 0 -22 1 57 16 25 48.8 8 247 -20 -20 47 47 -23 16 20 -20 33 37 -23 30 35 0.14 -168 0 0 -21 36 38 16 25 47.5 7 246 -19 -20 22 19 -22 51 10 -20 8 7 -23 5 26 0.14 -167 0 0 -21 10 57 16 25 46.3 6 246 -18 -19 56 29 -22 25 38 -19 42 16 -22 39 56 0.15 -166 0 0 -20 44 55 16 25 45.3 5 246 -17 -19 30 18 -21 59 44 -19 16 4 -22 14 3 0.16 -165 0 0 -20 18 31 16 25 44.5 4 245 -16 -19 3 46 -21 33 29 -18 49 30 -21 47 50 0.17 -164 0 0 -19 51 47 16 25 43.9 3 245 -15 -18 36 54 -21 6 53 -18 22 36 -21 21 15 0.18 -163 0 0 -19 24 42 16 25 43.4 2 245 -14 -18 9 41 -20 39 56 -17 55 22 -20 54 20 0.21 -162 0 0 -18 57 18 16 25 43.1 1 244 -13 -17 42 9 -20 12 39 -17 27 48 -20 27 5 0.31 -161 0 0 -18 29 34 16 25 43.0 0 244 -12 .. .. .. -19 45 3 .. .. .. -19 59 31 4.17 Uncertainty in time = +/- 3 secs Prediction of 2023 May 29.0 Data for the target star ------------------------ * name: UCAC4 328-179757 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 18 54 23.8239 DE: -24 35 46.468 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 18 54 23.8238 DE: -24 35 46.468 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 12.0 * 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 ["]: 0.204 distance from Earth [AU]: 1.67520 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): 0.029", 0.015", 73.294° remarks: * orbital elements for (15)Eunomia : Mean anomaly = 277.3085517070 deg Arg. of pericenter = 98.7450657243 deg Long. of node = 292.9064966042 deg Inclination = 11.7544844873 deg Eccentricity = 0.1870734593 Semimajor axis = 2.6427898860 AU Perihelion dist = 2.1483940399 AU Mag: H = 5.38, G = 0.23 Epoch of elements : MJD 60144.69062500 TDT (2023 Jul 19.6906) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#932023Apr24,20.77,2023,7,19,16.575467,-0.028851,-0.127587,-6.582701,1.488220,0.001338,0.000290,0.000001,0.000000 98.1171,-24.5668,-67.04,20.80,False UCAC4 328-179757,18.90661774,-24.5962412,0.00,12.00,0.00,0.0,0,,18.93088039,-24.5667837,0.07,0.00,0,0,0 15,Eunomia,9.07,248.3,1.6752,0,0,-2.532,7.81,,14.4,0 0,277.1501,2023,7,19,98.7451,292.9065,11.7545,0.18707,2.64279,2.14839,5.38,5.0,0.15 1.096,0.0290,0.0153,73,0.0195,Known errors,-1.00,-1,-1,-1 20230719_179757,60092.98 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 May 28, 23:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org