IOTA/IOTA-ES occultation update for (179) Klytaemnestra / TYC 6282-00641-1 event on 2009 Oct 11, 02:06 UT Visible from Summary ------- On 2009 Oct 11 UT, the 78 km diameter asteroid (179) Klytaemnestra will occult a 10.6 mag star in the constellation Sagittarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 13.4 mag (the magnitude of the asteroid) for at most 4.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 82 * date and approx. time of event: 2009 Oct 11, 02:06 - 2009 Oct 11, 02:10 UT * magnitude of target star: 10.6 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 4.2 * Moon: 54 % sunlit, 172° distance * Sun: 87° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 91 * 1 sigma uncertainty interval [path widths]: +/- 0.65 * 1 sigma uncertainty interval [seconds]: +/- 3.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .033 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .033", .027", 84° ) * approx speed of asteroid's shadow [km/s]: 18.7109 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6282-00641-1 by 179 Klytaemnestra on 2009 Oct 11 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude -126 0 0 15 28 48 2 6 5 59 180 -1 15 4 3 15 53 39 14 32 2 16 26 8 -125 0 0 15 31 51 2 6 10 59 181 -2 15 7 5 15 56 43 14 35 4 16 29 12 -124 0 0 15 35 14 2 6 16 59 183 -3 15 10 29 16 0 7 14 38 27 16 32 37 -123 0 0 15 38 58 2 6 22 58 185 -4 15 14 12 16 3 51 14 42 9 16 36 22 -122 0 0 15 43 3 2 6 28 58 187 -5 15 18 16 16 7 56 14 46 13 16 40 28 -121 0 0 15 47 28 2 6 34 58 189 -6 15 22 40 16 12 22 14 50 36 16 44 54 -120 0 0 15 52 13 2 6 40 58 191 -7 15 27 25 16 17 7 14 55 20 16 49 41 -119 0 0 15 57 18 2 6 46 57 193 -8 15 32 29 16 22 13 15 0 23 16 54 47 -118 0 0 16 2 43 2 6 51 57 194 -9 15 37 53 16 27 39 15 5 46 17 0 14 -117 0 0 16 8 28 2 6 57 57 196 -10 15 43 38 16 33 25 15 11 30 17 6 1 -116 0 0 16 14 33 2 7 3 56 198 -11 15 49 42 16 39 31 15 17 33 17 12 8 -115 0 0 16 20 57 2 7 9 56 199 -12 15 56 5 16 45 56 15 23 55 17 18 34 -114 0 0 16 27 41 2 7 14 56 201 -13 16 2 48 16 52 41 15 30 37 17 25 20 -113 0 0 16 34 45 2 7 20 55 202 -14 16 9 51 16 59 45 15 37 38 17 32 26 -112 0 0 16 42 7 2 7 26 55 204 -15 16 17 12 17 7 9 15 44 59 17 39 51 -111 0 0 16 49 49 2 7 31 54 205 -16 16 24 53 17 14 51 15 52 38 17 47 35 -110 0 0 16 57 50 2 7 37 54 207 -17 16 32 53 17 22 53 16 0 37 17 55 38 -109 0 0 17 6 9 2 7 42 53 208 -18 16 41 11 17 31 14 16 8 54 18 4 0 -108 0 0 17 14 47 2 7 48 52 209 -18 16 49 48 17 39 53 16 17 29 18 12 40 -107 0 0 17 23 43 2 7 53 52 211 -19 16 58 43 17 48 50 16 26 23 18 21 39 -106 0 0 17 32 58 2 7 59 51 212 -20 17 7 57 17 58 6 16 35 35 18 30 57 -105 0 0 17 42 30 2 8 4 50 213 -21 17 17 28 18 7 40 16 45 5 18 40 32 -104 0 0 17 52 21 2 8 9 50 214 -22 17 27 17 18 17 31 16 54 52 18 50 25 -103 0 0 18 2 29 2 8 14 49 216 -23 17 37 24 18 27 40 17 4 57 19 0 36 -102 0 0 18 12 54 2 8 20 48 217 -24 17 47 48 18 38 7 17 15 19 19 11 4 -101 0 0 18 23 36 2 8 25 48 218 -25 17 58 29 18 48 50 17 25 59 19 21 49 -100 0 0 18 34 35 2 8 30 47 219 -26 18 9 27 18 59 51 17 36 55 19 32 51 - 99 0 0 18 45 51 2 8 35 46 220 -27 18 20 41 19 11 8 17 48 8 19 44 10 - 98 0 0 18 57 23 2 8 40 45 221 -28 18 32 12 19 22 41 17 59 37 19 55 46 - 97 0 0 19 9 11 2 8 44 45 222 -29 18 43 59 19 34 31 18 11 22 20 7 37 - 96 0 0 19 21 15 2 8 49 44 223 -30 18 56 1 19 46 36 18 23 23 20 19 44 - 95 0 0 19 33 35 2 8 54 43 223 -31 19 8 19 19 58 57 18 35 39 20 32 7 - 94 0 0 19 46 10 2 8 58 42 224 -32 19 20 53 20 11 33 18 48 11 20 44 45 - 93 0 0 19 58 59 2 9 3 41 225 -33 19 33 41 20 24 24 19 0 57 20 57 38 - 92 0 0 20 12 4 2 9 8 41 226 -34 19 46 44 20 37 30 19 13 59 21 10 45 - 91 0 0 20 25 22 2 9 12 40 227 -35 20 0 1 20 50 50 19 27 14 21 24 7 - 90 0 0 20 38 55 2 9 16 39 227 -36 20 13 32 21 4 24 19 40 43 21 37 43 - 89 0 0 20 52 41 2 9 20 38 228 -37 20 27 17 21 18 12 19 54 27 21 51 33 - 88 0 0 21 6 41 2 9 25 37 229 -38 20 41 16 21 32 13 20 8 23 22 5 36 - 87 0 0 21 20 54 2 9 29 36 230 -38 20 55 27 21 46 27 20 22 33 22 19 52 - 86 0 0 21 35 19 2 9 33 35 230 -39 21 9 51 22 0 54 20 36 55 22 34 21 - 85 0 0 21 49 57 2 9 37 34 231 -40 21 24 28 22 15 33 20 51 30 22 49 2 - 84 0 0 22 4 47 2 9 40 34 232 -41 21 39 16 22 30 24 21 6 16 23 3 55 - 83 0 0 22 19 48 2 9 44 33 232 -42 21 54 16 22 45 27 21 21 14 23 18 59 - 82 0 0 22 35 1 2 9 48 32 233 -43 22 9 27 23 0 41 21 36 24 23 34 15 - 81 0 0 22 50 24 2 9 51 31 233 -44 22 24 49 23 16 6 21 51 44 23 49 41 - 80 0 0 23 5 58 2 9 55 30 234 -45 22 40 22 23 31 41 22 7 15 24 5 18 - 79 0 0 23 21 42 2 9 58 29 235 -45 22 56 4 23 47 26 22 22 56 24 21 5 - 78 0 0 23 37 36 2 10 1 28 235 -46 23 11 57 24 3 21 22 38 47 24 37 2 - 77 0 0 23 53 39 2 10 4 27 236 -47 23 27 59 24 19 26 22 54 47 24 53 8 - 76 0 0 24 9 51 2 10 7 26 236 -48 23 44 9 24 35 39 23 10 56 25 9 23 - 75 0 0 24 26 11 2 10 10 25 237 -49 24 0 29 24 52 1 23 27 14 25 25 46 - 74 0 0 24 42 40 2 10 13 24 237 -49 24 16 56 25 8 30 23 43 40 25 42 18 - 73 0 0 24 59 16 2 10 16 24 238 -50 24 33 31 25 25 8 24 0 14 25 58 57 - 72 0 0 25 15 59 2 10 18 23 238 -51 24 50 14 25 41 53 24 16 55 26 15 43 - 71 0 0 25 32 50 2 10 21 22 239 -52 25 7 3 25 58 44 24 33 43 26 32 36 - 70 0 0 25 49 47 2 10 23 21 239 -52 25 23 59 26 15 42 24 50 37 26 49 35 - 69 0 0 26 6 50 2 10 25 20 240 -53 25 41 1 26 32 46 25 7 38 27 6 41 - 68 0 0 26 23 58 2 10 28 19 241 -54 25 58 8 26 49 56 25 24 44 27 23 51 - 67 0 0 26 41 12 2 10 30 18 241 -55 26 15 21 27 7 10 25 41 55 27 41 7 - 66 0 0 26 58 30 2 10 32 17 242 -55 26 32 38 27 24 30 25 59 12 27 58 28 - 65 0 0 27 15 53 2 10 34 16 242 -56 26 50 0 27 41 53 26 16 33 28 15 53 - 64 0 0 27 33 20 2 10 35 15 243 -56 27 7 26 27 59 21 26 33 57 28 33 22 - 63 0 0 27 50 50 2 10 37 14 243 -57 27 24 56 28 16 52 26 51 26 28 50 54 - 62 0 0 28 8 23 2 10 39 13 244 -58 27 42 28 28 34 26 27 8 57 29 8 29 - 61 0 0 28 25 59 2 10 40 12 244 -58 28 0 4 28 52 3 27 26 32 29 26 6 - 60 0 0 28 43 38 2 10 41 12 245 -59 28 17 41 29 9 41 27 44 9 29 43 46 - 59 0 0 29 1 18 2 10 43 11 245 -59 28 35 20 29 27 22 28 1 47 30 1 27 - 58 0 0 29 18 59 2 10 44 10 246 -60 28 53 1 29 45 4 28 19 27 30 19 10 - 57 0 0 29 36 41 2 10 45 9 246 -60 29 10 43 30 2 47 28 37 8 30 36 54 - 56 0 0 29 54 24 2 10 46 8 247 -60 29 28 25 30 20 30 28 54 50 30 54 38 - 55 0 0 30 12 7 2 10 46 7 247 -61 29 46 8 30 38 14 29 12 32 31 12 21 - 54 0 0 30 29 50 2 10 47 6 248 -61 30 3 50 30 55 57 29 30 14 31 30 5 - 53 0 0 30 47 32 2 10 48 5 248 -61 30 21 32 31 13 39 29 47 55 31 47 48 - 52 0 0 31 5 13 2 10 48 4 249 -62 30 39 13 31 31 20 30 5 36 32 5 29 - 51 0 0 31 22 52 2 10 49 3 249 -62 30 56 52 31 49 0 30 23 15 32 23 9 - 50 0 0 31 40 30 2 10 49 2 250 -62 31 14 30 32 6 38 30 40 52 32 40 47 - 49 0 0 31 58 5 2 10 49 1 250 -62 31 32 5 32 24 13 30 58 27 32 58 23 - 48 0 0 32 15 38 2 10 49 1 251 -62 31 49 38 32 41 46 31 16 0 33 15 56 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 6282-00641-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 01 36.8711 DE: -15 56 18.891 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .025 ) * V mag [mag]: 10.6 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (179) Klytaemnestra approx. diameter [km]: 78 approx. diameter ["]: .042 distance from Earth [AU]: 2.58900 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 708 number of rejected observations: 109 time covered by the observations: 1908 Dec 02 - 2008 Feb 01 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.011, 76° remarks: * orbital elements for (179) Klytaemnestra : Mean anomaly = 319.60363157 deg Arg. of pericenter = 104.69213045 deg Long. of node = 252.09357030 deg Inclination = 7.81213479 deg Eccentricity = 0.11628130 Semimajor axis = 2.97241401 AU Perihelion dist = 2.62677785 AU Mag: H = 8.06, G = 0.15 Epoch of elements : MJD 55115.08800000 TDT (2009 Oct 11.088) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 11 179 Klytaemnestra 2h 6.0m UT 10.6 19 1 36.871-15 56 18.89TYC 6282-00641-1 11.5 13.4 78 4.2 2.589 2.485 1.52 -125.8930 -15.939 145.21 -7.02 2.0995 -0.02255 0.51868 10.55153 0.44644 0.00571 0.00064 2000 318.625073200910 6.00000104.692130252.093570 7.8121350.11628130 2.9724140 2.6267778 8.2 5.00.15 RATE 1.9232690 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.033 0.027 84 1.65 0.027 0 54545.5020091011_0641-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 14:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org