IOTA/IOTA-ES occultation update for (15) Eunomia / UCAC4 356-179411 event on 2023 Oct 22, 23:49 UT Visible from South America Summary ------- On 2023 Oct 22 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 0.20 mag to 10.43 mag (the magnitude of the asteroid) for at most 10.880 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 Oct 22, 23:44 - 2023 Oct 22, 23:54 * geocentric midpoint of event [JD]: 2460240.49275838 * magnitude of target star: 12.14 * magnitude drop [mag]: 0.20 * estimated maximum duration [s]: 10.880 * Moon: 59 % sunlit, 24° distance * Sun: 78° distance * rough path description: South America Additional comments ------------------- low mag drop The occultation path -------------------- * approximate projected width [km]: 251 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 0.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.005, +/- 0.003) * 1 sigma uncertainty ellipse (major, minor, PA): (0.005", 0.002", 70°) * approx speed of asteroid's shadow [km/s]: 22.8173 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 356-179411 by 15 Eunomia on 2023 Oct 22 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 0 0 0 .. .. .... .. .. .. .. .. .. - 5 46 19 .. .. .. - 5 48 28 .. .. .. .... 170 0 0 - 4 55 5 23 44 57.9 1 109 78 - 6 6 49 - 3 43 8 - 6 8 58 - 3 40 58 .... 171 0 0 - 5 15 24 23 44 58.0 2 109 79 - 6 27 2 - 4 3 33 - 6 29 11 - 4 1 23 -0.05 172 0 0 - 5 35 26 23 44 58.2 3 109 80 - 6 46 58 - 4 23 41 - 6 49 7 - 4 21 31 -0.08 173 0 0 - 5 55 10 23 44 58.5 4 109 81 - 7 6 36 - 4 43 31 - 7 8 45 - 4 41 22 -0.10 174 0 0 - 6 14 36 23 44 59.0 5 109 82 - 7 25 56 - 5 3 4 - 7 28 4 - 5 0 54 -0.10 175 0 0 - 6 33 44 23 44 59.5 6 108 83 - 7 44 57 - 5 22 17 - 7 47 5 - 5 20 8 -0.11 176 0 0 - 6 52 33 23 45 0.1 7 108 84 - 8 3 40 - 5 41 12 - 8 5 48 - 5 39 3 -0.12 177 0 0 - 7 11 2 23 45 0.8 8 108 85 - 8 22 3 - 5 59 48 - 8 24 11 - 5 57 39 -0.12 178 0 0 - 7 29 13 23 45 1.6 9 108 86 - 8 40 7 - 6 18 5 - 8 42 15 - 6 15 56 -0.12 179 0 0 - 7 47 3 23 45 2.5 10 108 86 - 8 57 52 - 6 36 2 - 9 0 0 - 6 33 53 -0.12 -180 0 0 - 8 4 34 23 45 3.4 11 108 87 - 9 15 17 - 6 53 39 - 9 17 24 - 6 51 30 -0.13 -179 0 0 - 8 21 45 23 45 4.5 12 108 87 - 9 32 21 - 7 10 55 - 9 34 28 - 7 8 47 -0.13 -178 0 0 - 8 38 35 23 45 5.6 13 108 87 - 9 49 5 - 7 27 52 - 9 51 12 - 7 25 44 -0.13 -177 0 0 - 8 55 4 23 45 6.9 15 107 86 -10 5 28 - 7 44 27 -10 7 35 - 7 42 19 -0.13 -176 0 0 - 9 11 12 23 45 8.2 16 107 85 -10 21 30 - 8 0 41 -10 23 37 - 7 58 34 -0.13 -175 0 0 - 9 26 59 23 45 9.6 17 107 85 -10 37 11 - 8 16 34 -10 39 18 - 8 14 27 -0.13 -174 0 0 - 9 42 25 23 45 11.1 18 107 84 -10 52 31 - 8 32 6 -10 54 37 - 8 29 59 -0.13 -173 0 0 - 9 57 29 23 45 12.6 19 107 83 -11 7 29 - 8 47 16 -11 9 35 - 8 45 9 -0.13 -172 0 0 -10 12 11 23 45 14.3 20 107 82 -11 22 5 - 9 2 4 -11 24 11 - 8 59 57 -0.13 -171 0 0 -10 26 31 23 45 16.0 21 106 81 -11 36 20 - 9 16 30 -11 38 26 - 9 14 23 -0.13 -170 0 0 -10 40 29 23 45 17.8 22 106 80 -11 50 12 - 9 30 33 -11 52 18 - 9 28 27 -0.14 -169 0 0 -10 54 4 23 45 19.7 23 106 79 -12 3 42 - 9 44 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239 -31 1 58 36 4 26 10 1 56 23 4 28 24 -0.14 - 60 0 0 3 37 38 23 52 53.1 43 239 -32 2 23 55 4 51 35 2 21 42 4 53 49 -0.14 - 59 0 0 4 3 6 23 52 56.8 42 240 -33 2 49 20 5 17 6 2 47 7 5 19 20 -0.14 - 58 0 0 4 28 40 23 53 0.4 41 240 -34 3 14 51 5 42 42 3 12 38 5 44 56 -0.14 - 57 0 0 4 54 18 23 53 3.9 40 240 -35 3 40 27 6 8 23 3 38 14 6 10 37 -0.14 - 56 0 0 5 20 0 23 53 7.4 39 240 -36 4 6 8 6 34 7 4 3 55 6 36 21 -0.14 - 55 0 0 5 45 46 23 53 10.8 38 240 -38 4 31 52 6 59 55 4 29 39 7 2 9 -0.14 - 54 0 0 6 11 35 23 53 14.1 37 241 -39 4 57 39 7 25 45 4 55 26 7 27 59 -0.14 - 53 0 0 6 37 25 23 53 17.3 36 241 -40 5 23 28 7 51 37 5 21 15 7 53 51 -0.14 - 52 0 0 7 3 17 23 53 20.4 35 241 -41 5 49 19 8 17 30 5 47 6 8 19 44 -0.14 - 51 0 0 7 29 10 23 53 23.4 34 241 -42 6 15 11 8 43 23 6 12 58 8 45 38 -0.14 - 50 0 0 7 55 3 23 53 26.3 33 241 -43 6 41 4 9 9 17 6 38 50 9 11 31 -0.14 - 49 0 0 8 20 55 23 53 29.2 32 242 -44 7 6 55 9 35 9 7 4 42 9 37 23 -0.14 - 48 0 0 8 46 46 23 53 32.0 30 242 -45 7 32 46 10 1 0 7 30 33 10 3 14 -0.14 - 47 0 0 9 12 35 23 53 34.6 29 242 -46 7 58 35 10 26 48 7 56 22 10 29 2 -0.14 - 46 0 0 9 38 21 23 53 37.2 28 242 -47 8 24 22 10 52 34 8 22 9 10 54 48 -0.14 - 45 0 0 10 4 4 23 53 39.7 27 243 -48 8 50 6 11 18 16 8 47 53 11 20 30 -0.14 - 44 0 0 10 29 43 23 53 42.1 26 243 -49 9 15 46 11 43 54 9 13 33 11 46 8 -0.14 - 43 0 0 10 55 17 23 53 44.4 25 243 -50 9 41 22 12 9 27 9 39 8 12 11 41 -0.14 - 42 0 0 11 20 46 23 53 46.6 24 243 -51 10 6 52 12 34 54 10 4 39 12 37 8 -0.14 - 41 0 0 11 46 9 23 53 48.7 23 243 -52 10 32 17 13 0 16 10 30 4 13 2 30 -0.14 - 40 0 0 12 11 26 23 53 50.7 22 244 -53 10 57 36 13 25 30 10 55 23 13 27 44 -0.14 - 39 0 0 12 36 36 23 53 52.6 21 244 -54 11 22 49 13 50 38 11 20 35 13 52 52 -0.14 - 38 0 0 13 1 38 23 53 54.4 20 244 -55 11 47 53 14 15 37 11 45 40 14 17 51 -0.14 - 37 0 0 13 26 32 23 53 56.1 19 244 -56 12 12 50 14 40 28 12 10 37 14 42 42 -0.14 - 36 0 0 13 51 17 23 53 57.7 18 245 -57 12 37 38 15 5 10 12 35 25 15 7 24 -0.14 - 35 0 0 14 15 53 23 53 59.3 17 245 -58 13 2 17 15 29 43 13 0 4 15 31 56 -0.13 - 34 0 0 14 40 18 23 54 0.7 15 245 -59 13 26 46 15 54 5 13 24 33 15 56 18 -0.13 - 33 0 0 15 4 34 23 54 2.0 14 245 -60 13 51 5 16 18 16 13 48 52 16 20 30 -0.13 - 32 0 0 15 28 38 23 54 3.3 13 246 -61 14 15 13 16 42 17 14 13 1 16 44 30 -0.13 - 31 0 0 15 52 31 23 54 4.4 12 246 -62 14 39 10 17 6 6 14 36 58 17 8 19 -0.13 - 30 0 0 16 16 12 23 54 5.5 11 246 -63 15 2 55 17 29 42 15 0 43 17 31 55 -0.13 - 29 0 0 16 39 40 23 54 6.4 10 247 -64 15 26 28 17 53 6 15 24 16 17 55 19 -0.13 - 28 0 0 17 2 56 23 54 7.3 9 247 -65 15 49 48 18 16 17 15 47 36 18 18 30 -0.13 - 27 0 0 17 25 58 23 54 8.0 8 247 -65 16 12 55 18 39 14 16 10 43 18 41 27 -0.13 - 26 0 0 17 48 46 23 54 8.7 7 247 -66 16 35 48 19 1 57 16 33 37 19 4 10 -0.13 - 25 0 0 18 11 20 23 54 9.3 6 248 -67 16 58 27 19 24 26 16 56 16 19 26 39 -0.13 - 24 0 0 18 33 39 23 54 9.8 5 248 -68 17 20 52 19 46 41 17 18 41 19 48 53 -0.13 - 23 0 0 18 55 44 23 54 10.2 4 248 -69 17 43 2 20 8 40 17 40 51 20 10 52 -0.13 - 22 0 0 19 17 33 23 54 10.5 3 249 -69 18 4 56 20 30 23 18 2 45 20 32 35 -0.12 - 21 0 0 19 39 6 23 54 10.7 2 249 -70 18 26 35 20 51 51 18 24 24 20 54 2 -0.11 - 20 0 0 20 0 23 23 54 10.8 1 249 -71 18 47 58 21 13 2 18 45 47 21 15 14 -0.09 - 19 0 0 20 21 24 23 54 10.9 0 250 -72 19 9 5 .. .. .. 19 6 54 .. .. .. 0.92 Uncertainty in time = +/- 0 secs Prediction of 2023 Oct 15.9 Data for the target star ------------------------ * name: UCAC4 356-179411 * constellation : Sagittarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 10 41.1774 DE: -18 58 15.010 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 10 41.1774 DE: -18 58 15.010 * 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 ["]: 0.137 distance from Earth [AU]: 2.49420 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#96 date of fit: 2023 Oct 09 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): 0.005", 0.002", 69.595° remarks: * orbital elements for (15)Eunomia : Mean anomaly = 299.1510370305 deg Arg. of pericenter = 98.7716967346 deg Long. of node = 292.9067504367 deg Inclination = 11.7550727672 deg Eccentricity = 0.1871086713 Semimajor axis = 2.6425838378 AU Perihelion dist = 2.1481334872 AU Mag: H = 5.41, G = 0.23 Epoch of elements : MJD 60239.99277778 TDT (2023 Oct 22.9928) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#962023Oct09,10.88,2023,10,22,23.826201,-0.033172,0.140782,12.541348,2.928403,0.005495,0.000761,0.000000,0.000000 -100.5247,-18.9326,178.72,-11.23,False UCAC4 356-179411,19.17810488,-18.9708361,0.00,12.14,0.00,0.0,0,,19.20109429,-18.9325881,0.20,0.00,0,0,0 15,Eunomia,10.43,248.300,2.4942,0,0,3.117,10.33,,14.4,0 0,298.9233,2023,10,22,98.7717,292.9068,11.7551,0.18711,2.64258,2.14813,5.38,5.0,0.15 1.015,0.0050,0.0020,70,0.0054,Known errors,-1.00,0,-1,-1 20231022_179411,60232.87 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Oct 15, 20:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org