IOTA/IOTA-ES occultation update for (386) Siegena / UCAC4 472-108889 event on 2024 Jun 26, 03:12 UT Visible from Summary ------- On 2024 Jun 26 UT, the 178.543 km diameter asteroid (386) Siegena will occult a 11.2 mag star in the constellation Aquila for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.36 mag to 12.23 mag (the magnitude of the asteroid) for at most 19.490 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: 2024 Jun 26, 03:01 - 2024 Jun 26, 03:22 * geocentric midpoint of event [JD]: 2460487.63336138 * magnitude of target star: 11.23 * magnitude drop [mag]: 1.36 * estimated maximum duration [s]: 19.490 * Moon: 80 % sunlit, 38° distance * Sun: 144° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 214 * 1 sigma uncertainty interval [path widths]: +/- 0.02 * 1 sigma uncertainty interval [seconds]: +/- 2.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.014, +/- 0.002) * 1 sigma uncertainty ellipse (major, minor, PA): (0.014", 0.002", 91°) * approx speed of asteroid's shadow [km/s]: 9.1604 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC4 472-108889 by 386 Siegena on 2024 Jun 26 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 -113 0 0 -37 25 44 3 21 42.0 0 84 -35 -36 27 41 -38 24 26 -36 25 34 -38 26 35 .... -112 0 0 -37 21 10 3 21 41.9 1 84 -35 -36 23 6 -38 19 53 -36 21 0 -38 22 2 0.38 -111 0 0 -37 16 32 3 21 41.6 2 83 -36 -36 18 28 -38 15 16 -36 16 22 -38 17 25 0.50 -110 0 0 -37 11 51 3 21 41.1 3 83 -37 -36 13 46 -38 10 35 -36 11 40 -38 12 44 0.55 -109 0 0 -37 7 5 3 21 40.5 3 82 -38 -36 9 0 -38 5 50 -36 6 54 -38 7 59 0.58 -108 0 0 -37 2 17 3 21 39.7 4 81 -39 -36 4 11 -38 1 2 -36 2 5 -38 3 11 0.59 -107 0 0 -36 57 24 3 21 38.8 5 81 -39 -35 59 18 -37 56 10 -35 57 12 -37 58 19 0.60 -106 0 0 -36 52 28 3 21 37.7 6 80 -40 -35 54 22 -37 51 14 -35 52 15 -37 53 24 0.61 -105 0 0 -36 47 29 3 21 36.4 7 80 -41 -35 49 22 -37 46 16 -35 47 16 -37 48 25 0.62 -104 0 0 -36 42 27 3 21 34.9 7 79 -42 -35 44 19 -37 41 14 -35 42 13 -37 43 23 0.62 -103 0 0 -36 37 21 3 21 33.3 8 78 -43 -35 39 13 -37 36 8 -35 37 7 -37 38 18 0.63 -102 0 0 -36 32 12 3 21 31.6 9 78 -43 -35 34 4 -37 31 0 -35 31 57 -37 33 9 0.63 -101 0 0 -36 27 0 3 21 29.7 10 77 -44 -35 28 51 -37 25 49 -35 26 45 -37 27 58 0.63 -100 0 0 -36 21 45 3 21 27.6 11 77 -45 -35 23 36 -37 20 34 -35 21 30 -37 22 44 0.64 - 99 0 0 -36 16 28 3 21 25.3 11 76 -46 -35 18 18 -37 15 17 -35 16 12 -37 17 26 0.64 - 98 0 0 -36 11 8 3 21 22.9 12 75 -47 -35 12 58 -37 9 57 -35 10 51 -37 12 6 0.64 - 97 0 0 -36 5 45 3 21 20.3 13 75 -47 -35 7 34 -37 4 35 -35 5 28 -37 6 44 0.64 - 96 0 0 -36 0 19 3 21 17.6 14 74 -48 -35 2 8 -36 59 9 -35 0 2 -37 1 19 0.64 - 95 0 0 -35 54 51 3 21 14.7 15 74 -49 -34 56 40 -36 53 42 -34 54 34 -36 55 51 0.65 - 94 0 0 -35 49 21 3 21 11.7 15 73 -50 -34 51 9 -36 48 12 -34 49 3 -36 50 21 0.65 - 93 0 0 -35 43 48 3 21 8.5 16 72 -51 -34 45 36 -36 42 39 -34 43 30 -36 44 49 0.65 - 92 0 0 -35 38 13 3 21 5.1 17 72 -51 -34 40 1 -36 37 5 -34 37 55 -36 39 14 0.65 - 91 0 0 -35 32 36 3 21 1.6 18 71 -52 -34 34 24 -36 31 28 -34 32 18 -36 33 37 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7.9 29 293 -21 -27 0 59 -28 57 11 -26 58 53 -28 59 19 0.67 33 0 0 -28 0 6 3 4 2.0 28 292 -20 -27 2 19 -28 58 31 -27 0 13 -29 0 40 0.67 34 0 0 -28 1 32 3 3 56.2 27 291 -20 -27 3 45 -28 59 58 -27 1 40 -29 2 7 0.67 35 0 0 -28 3 5 3 3 50.5 26 291 -19 -27 5 18 -29 1 32 -27 3 12 -29 3 40 0.67 36 0 0 -28 4 44 3 3 45.0 25 290 -18 -27 6 57 -29 3 11 -27 4 51 -29 5 20 0.67 37 0 0 -28 6 30 3 3 39.7 25 290 -17 -27 8 42 -29 4 57 -27 6 36 -29 7 5 0.67 38 0 0 -28 8 22 3 3 34.5 24 289 -16 -27 10 33 -29 6 49 -27 8 27 -29 8 58 0.67 39 0 0 -28 10 19 3 3 29.5 23 289 -16 -27 12 30 -29 8 47 -27 10 25 -29 10 56 0.67 40 0 0 -28 12 23 3 3 24.7 22 288 -15 -27 14 34 -29 10 52 -27 12 28 -29 13 0 0.67 41 0 0 -28 14 34 3 3 20.0 21 287 -14 -27 16 44 -29 13 2 -27 14 38 -29 15 11 0.67 42 0 0 -28 16 50 3 3 15.5 21 287 -13 -27 18 59 -29 15 19 -27 16 54 -29 17 28 0.68 43 0 0 -28 19 12 3 3 11.1 20 286 -12 -27 21 21 -29 17 42 -27 19 16 -29 19 50 0.68 44 0 0 -28 21 41 3 3 7.0 19 286 -12 -27 23 49 -29 20 11 -27 21 44 -29 22 19 0.68 45 0 0 -28 24 15 3 3 3.0 18 285 -11 -27 26 23 -29 22 46 -27 24 18 -29 24 54 0.68 46 0 0 -28 26 55 3 2 59.2 17 285 -10 -27 29 3 -29 25 27 -27 26 57 -29 27 35 0.68 47 0 0 -28 29 42 3 2 55.6 16 284 -9 -27 31 49 -29 28 13 -27 29 43 -29 30 22 0.68 48 0 0 -28 32 34 3 2 52.1 15 284 -8 -27 34 41 -29 31 6 -27 32 35 -29 33 15 0.68 49 0 0 -28 35 32 3 2 48.8 15 283 -8 -27 37 39 -29 34 5 -27 35 33 -29 36 14 0.68 50 0 0 -28 38 36 3 2 45.7 14 283 -7 -27 40 42 -29 37 10 -27 38 36 -29 39 18 0.68 51 0 0 -28 41 46 3 2 42.8 13 282 -6 -27 43 51 -29 40 20 -27 41 45 -29 42 29 0.68 52 0 0 -28 45 1 3 2 40.1 12 282 -5 -27 47 6 -29 43 36 -27 45 0 -29 45 45 0.69 53 0 0 -28 48 23 3 2 37.6 11 281 -5 -27 50 27 -29 46 58 -27 48 21 -29 49 6 0.69 54 0 0 -28 51 49 3 2 35.2 10 281 -4 -27 53 53 -29 50 25 -27 51 47 -29 52 34 0.69 55 0 0 -28 55 22 3 2 33.0 9 280 -3 -27 57 25 -29 53 58 -27 55 19 -29 56 7 0.69 56 0 0 -28 58 59 3 2 31.1 9 280 -2 -28 1 2 -29 57 36 -27 58 56 -29 59 45 0.69 57 0 0 -29 2 43 3 2 29.3 8 279 -1 -28 4 45 -30 1 20 -28 2 39 -30 3 29 0.70 58 0 0 -29 6 31 3 2 27.7 7 279 -1 -28 8 33 -30 5 9 -28 6 27 -30 7 18 0.70 59 0 0 -29 10 25 3 2 26.3 6 278 0 -28 12 26 -30 9 4 -28 10 20 -30 11 12 0.71 60 0 0 -29 14 24 3 2 25.0 5 278 1 -28 16 25 -30 13 3 -28 14 19 -30 15 12 0.72 61 0 0 -29 18 29 3 2 24.0 4 277 2 -28 20 28 -30 17 8 -28 18 22 -30 19 17 0.73 62 0 0 -29 22 38 3 2 23.2 3 277 2 -28 24 37 -30 21 18 -28 22 31 -30 23 27 0.74 63 0 0 -29 26 53 3 2 22.6 2 276 3 -28 28 51 -30 25 34 -28 26 45 -30 27 43 0.77 64 0 0 -29 31 12 3 2 22.1 2 276 4 -28 33 10 -30 29 54 -28 31 4 -30 32 3 0.83 65 0 0 -29 35 37 3 2 21.9 1 275 4 -28 37 34 -30 34 19 -28 35 28 -30 36 28 1.02 Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 14.4 Data for the target star ------------------------ * name: UCAC4 472-108889 * constellation : Aquila * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 19 53 00.3878 DE: +04 12 36.203 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 19 53 00.3880 DE: +04 12 36.206 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.100,0.100) * V mag [mag]: 11.2 * B mag [mag]: 11.6 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (386) Siegena asteroid class: approx. diameter [km]: 179 approx. diameter ["]: 0.124 distance from Earth [AU]: 1.99110 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#122 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): 0.014", 0.002", 90.5° remarks: * orbital elements for (386)Siegena : Mean anomaly = 281.9111098357 deg Arg. of pericenter = 221.0226190799 deg Long. of node = 166.6190361050 deg Inclination = 20.2173287268 deg Eccentricity = 0.1692925523 Semimajor axis = 2.8978062306 AU Perihelion dist = 2.4072292178 AU Mag: H = 7.72, G = 0.16 Epoch of elements : MJD 60487.13336171 TDT (2024 Jun 26.1334) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1222023Apr24,19.49,2024,6,26,3.200673,0.037041,-0.549851,-5.158449,-0.351498,-0.002026,-0.002542,0.000001,0.000000 -24.1923,4.2727,132.72,23.34,False UCAC4 472-108889,19.88344106,4.2100563,11.55,11.23,11.06,0.0,0,,19.90404969,4.2727015,1.36,1.17,0,0,0 386,Siegena,12.23,178.543,1.9911,0,0,-1.523,-1.56,,13.2,0 0,281.8845,2024,6,26,221.0226,166.6190,20.2173,0.16929,2.89781,2.40723,7.72,5.0,0.15 1.018,0.0140,0.0020,91,0.0023,Known errors,0.78,0,-1,-1 20240626_108889,60139.40 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 14, 09:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org