IOTA/IOTA-ES occultation update for (379) Huenna / 2UCAC 24733323 event on 2008 Oct 11, 00:11 UT Visible from Brazil, Peru Summary ------- On 2008 Oct 11 UT, the 92 km diameter asteroid (379) Huenna will occult a 12.6 mag star in the constellation Capricornus for observers along a path across Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 13.7 mag (the magnitude of the asteroid) for at most 7.9 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: 75 * date and approx. time of event: 2008 Oct 11, 00:09 - 2008 Oct 11, 00:20 UT * magnitude of target star: 12.6 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 7.9 * Moon: 82 % sunlit, 27° distance * Sun: 103° distance * rough path description: Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 93 * 1 sigma uncertainty interval [path widths]: +/- 0.75 * 1 sigma uncertainty interval [seconds]: +/- 5.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .044 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .044", 88° ) * approx speed of asteroid's shadow [km/s]: 11.6733 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 24733323 by 379 Huenna on 2008 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 - 93 0 0 -14 1 15 0 9 23 76 113 -1 -14 26 24 -13 36 6 -15 4 4 -12 58 18 - 92 0 0 -13 57 14 0 9 33 77 114 -2 -14 22 23 -13 32 4 -15 0 5 -12 54 15 - 91 0 0 -13 52 49 0 9 42 78 116 -3 -14 17 59 -13 27 38 -14 55 42 -12 49 48 - 90 0 0 -13 48 1 0 9 52 78 118 -4 -14 13 12 -13 22 49 -14 50 56 -12 44 58 - 89 0 0 -13 42 50 0 10 1 79 121 -5 -14 8 1 -13 17 37 -14 45 46 -12 39 45 - 88 0 0 -13 37 15 0 10 11 80 124 -6 -14 2 27 -13 12 1 -14 40 14 -12 34 8 - 87 0 0 -13 31 17 0 10 20 81 128 -7 -13 56 31 -13 6 2 -14 34 19 -12 28 7 - 86 0 0 -13 24 56 0 10 30 81 132 -8 -13 50 11 -12 59 40 -14 28 0 -12 21 44 - 85 0 0 -13 18 12 0 10 40 82 138 -9 -13 43 28 -12 52 55 -14 21 19 -12 14 57 - 84 0 0 -13 11 5 0 10 49 83 144 -10 -13 36 22 -12 45 47 -14 14 15 -12 7 47 - 83 0 0 -13 3 35 0 10 59 83 151 -11 -13 28 53 -12 38 15 -14 6 48 -12 0 13 - 82 0 0 -12 55 41 0 11 9 83 159 -12 -13 21 1 -12 30 21 -13 58 58 -11 52 17 - 81 0 0 -12 47 25 0 11 19 84 168 -13 -13 12 46 -12 22 3 -13 50 45 -11 43 58 - 80 0 0 -12 38 47 0 11 28 84 177 -14 -13 4 9 -12 13 23 -13 42 10 -11 35 15 - 79 0 0 -12 29 45 0 11 38 83 186 -15 -12 55 9 -12 4 20 -13 33 12 -11 26 10 - 78 0 0 -12 20 21 0 11 48 83 194 -16 -12 45 46 -11 54 55 -13 23 52 -11 16 43 - 77 0 0 -12 10 35 0 11 58 83 201 -17 -12 36 1 -11 45 7 -13 14 9 -11 6 52 - 76 0 0 -12 0 26 0 12 8 82 207 -18 -12 25 54 -11 34 56 -13 4 4 -10 56 39 - 75 0 0 -11 49 55 0 12 18 81 212 -19 -12 15 24 -11 24 23 -12 53 37 -10 46 4 - 74 0 0 -11 39 1 0 12 27 81 217 -20 -12 4 33 -11 13 28 -12 42 48 -10 35 6 - 73 0 0 -11 27 46 0 12 37 80 221 -21 -11 53 19 -11 2 11 -12 31 36 -10 23 47 - 72 0 0 -11 16 8 0 12 47 79 224 -22 -11 41 43 -10 50 32 -12 20 3 -10 12 5 - 71 0 0 -11 4 9 0 12 57 78 226 -23 -11 29 46 -10 38 31 -12 8 9 -10 0 1 - 70 0 0 -10 51 48 0 13 6 77 229 -24 -11 17 27 -10 26 9 -11 55 52 - 9 47 36 - 69 0 0 -10 39 6 0 13 16 76 231 -25 -11 4 47 -10 13 25 -11 43 15 - 9 34 49 - 68 0 0 -10 26 3 0 13 26 75 232 -26 -10 51 45 -10 0 19 -11 30 16 - 9 21 41 - 67 0 0 -10 12 38 0 13 36 74 234 -28 -10 38 22 - 9 46 53 -11 16 56 - 9 8 12 - 66 0 0 - 9 58 53 0 13 45 74 235 -29 -10 24 39 - 9 33 6 -11 3 16 - 8 54 22 - 65 0 0 - 9 44 47 0 13 55 73 236 -30 -10 10 35 - 9 18 58 -10 49 14 - 8 40 11 - 64 0 0 - 9 30 20 0 14 5 72 237 -31 - 9 56 10 - 9 4 29 -10 34 53 - 8 25 40 - 63 0 0 - 9 15 34 0 14 14 71 238 -32 - 9 41 25 - 8 49 40 -10 20 11 - 8 10 48 - 62 0 0 - 9 0 27 0 14 24 70 239 -33 - 9 26 21 - 8 34 32 -10 5 9 - 7 55 36 - 61 0 0 - 8 45 0 0 14 33 69 239 -34 - 9 10 56 - 8 19 3 - 9 49 47 - 7 40 5 - 60 0 0 - 8 29 14 0 14 43 68 240 -35 - 8 55 12 - 8 3 15 - 9 34 6 - 7 24 13 - 59 0 0 - 8 13 9 0 14 52 67 240 -36 - 8 39 9 - 7 47 8 - 9 18 6 - 7 8 3 - 58 0 0 - 7 56 44 0 15 1 65 241 -37 - 8 22 46 - 7 30 41 - 9 1 47 - 6 51 34 - 57 0 0 - 7 40 2 0 15 11 64 241 -38 - 8 6 5 - 7 13 56 - 8 45 9 - 6 34 46 - 56 0 0 - 7 23 0 0 15 20 63 242 -39 - 7 49 6 - 6 56 53 - 8 28 12 - 6 17 40 - 55 0 0 - 7 5 41 0 15 29 62 242 -40 - 7 31 49 - 6 39 32 - 8 10 58 - 6 0 15 - 54 0 0 - 6 48 4 0 15 38 61 242 -41 - 7 14 14 - 6 21 53 - 7 53 26 - 5 42 33 - 53 0 0 - 6 30 9 0 15 47 60 243 -42 - 6 56 21 - 6 3 56 - 7 35 36 - 5 24 34 - 52 0 0 - 6 11 58 0 15 56 59 243 -43 - 6 38 11 - 5 45 43 - 7 17 30 - 5 6 18 - 51 0 0 - 5 53 30 0 16 5 58 243 -45 - 6 19 45 - 5 27 13 - 6 59 6 - 4 47 45 - 50 0 0 - 5 34 45 0 16 13 57 243 -46 - 6 1 3 - 5 8 26 - 6 40 27 - 4 28 55 - 49 0 0 - 5 15 45 0 16 22 56 243 -47 - 5 42 4 - 4 49 24 - 6 21 31 - 4 9 50 - 48 0 0 - 4 56 29 0 16 31 55 244 -48 - 5 22 50 - 4 30 6 - 6 2 20 - 3 50 30 - 47 0 0 - 4 36 58 0 16 39 54 244 -49 - 5 3 21 - 4 10 34 - 5 42 53 - 3 30 54 - 46 0 0 - 4 17 12 0 16 47 53 244 -50 - 4 43 37 - 3 50 46 - 5 23 12 - 3 11 4 - 45 0 0 - 3 57 13 0 16 56 52 244 -51 - 4 23 39 - 3 30 45 - 5 3 17 - 2 51 0 - 44 0 0 - 3 36 59 0 17 4 51 244 -52 - 4 3 27 - 3 10 29 - 4 43 7 - 2 30 42 - 43 0 0 - 3 16 32 0 17 12 50 244 -53 - 3 43 2 - 2 50 1 - 4 22 45 - 2 10 11 - 42 0 0 - 2 55 52 0 17 20 49 244 -54 - 3 22 24 - 2 29 19 - 4 2 9 - 1 49 27 - 41 0 0 - 2 35 0 0 17 27 47 244 -55 - 3 1 33 - 2 8 26 - 3 41 21 - 1 28 31 - 40 0 0 - 2 13 56 0 17 35 46 244 -56 - 2 40 31 - 1 47 20 - 3 20 20 - 1 7 23 - 39 0 0 - 1 52 41 0 17 43 45 245 -58 - 2 19 17 - 1 26 3 - 2 59 9 - 0 46 4 - 38 0 0 - 1 31 14 0 17 50 44 245 -59 - 1 57 52 - 1 4 35 - 2 37 46 - 0 24 34 - 37 0 0 - 1 9 38 0 17 57 43 245 -60 - 1 36 17 - 0 42 57 - 2 16 13 - 0 2 54 - 36 0 0 - 0 47 51 0 18 4 42 245 -61 - 1 14 31 - 0 21 10 - 1 54 29 0 18 55 - 35 0 0 - 0 25 55 0 18 11 41 245 -62 - 0 52 37 0 0 48 - 1 32 37 0 40 54 - 34 0 0 - 0 3 51 0 18 18 40 245 -63 - 0 30 33 0 22 53 - 1 10 35 1 3 2 - 33 0 0 0 18 22 0 18 25 39 245 -64 - 0 8 22 0 45 7 - 0 48 25 1 25 18 - 32 0 0 0 40 43 0 18 31 38 245 -65 0 13 58 1 7 29 - 0 26 7 1 47 41 - 31 0 0 1 3 10 0 18 37 37 245 -66 0 36 24 1 29 57 - 0 3 42 2 10 11 - 30 0 0 1 25 44 0 18 44 36 245 -67 0 58 58 1 52 32 0 18 50 2 32 47 - 29 0 0 1 48 24 0 18 50 34 245 -68 1 21 37 2 15 13 0 41 28 2 55 29 - 28 0 0 2 11 10 0 18 55 33 246 -70 1 44 22 2 38 0 1 4 12 3 18 17 - 27 0 0 2 34 0 0 19 1 32 246 -71 2 7 11 3 0 51 1 27 0 3 41 9 - 26 0 0 2 56 55 0 19 7 31 246 -72 2 30 5 3 23 46 1 49 53 4 4 5 - 25 0 0 3 19 53 0 19 12 30 246 -73 2 53 3 3 46 45 2 12 50 4 27 4 - 24 0 0 3 42 54 0 19 17 29 246 -74 3 16 4 4 9 46 2 35 50 4 50 7 - 23 0 0 4 5 58 0 19 22 28 246 -75 3 39 7 4 32 50 2 58 53 5 13 12 - 22 0 0 4 29 4 0 19 27 27 246 -76 4 2 13 4 55 57 3 21 58 5 36 18 - 21 0 0 4 52 11 0 19 31 26 246 -77 4 25 19 5 19 4 3 45 4 5 59 26 - 20 0 0 5 15 19 0 19 36 25 246 -78 4 48 27 5 42 12 4 8 12 6 22 34 - 19 0 0 5 38 27 0 19 40 24 246 -79 5 11 35 6 5 20 4 31 20 6 45 42 - 18 0 0 6 1 34 0 19 44 23 247 -80 5 34 43 6 28 27 4 54 27 7 8 50 - 17 0 0 6 24 41 0 19 48 21 247 -81 5 57 49 6 51 34 5 17 34 7 31 56 - 16 0 0 6 47 46 0 19 52 20 247 -82 6 20 54 7 14 39 5 40 39 7 55 1 - 15 0 0 7 10 49 0 19 55 19 247 -83 6 43 58 7 37 42 6 3 43 8 18 3 - 14 0 0 7 33 49 0 19 58 18 247 -84 7 6 58 8 0 42 6 26 44 8 41 3 - 13 0 0 7 56 46 0 20 2 17 247 -85 7 29 56 8 23 38 6 49 42 9 3 59 - 12 0 0 8 19 40 0 20 5 16 247 -86 7 52 49 8 46 31 7 12 36 9 26 51 - 11 0 0 8 42 29 0 20 7 15 248 -87 8 15 39 9 9 20 7 35 26 9 49 39 - 10 0 0 9 5 13 0 20 10 14 248 -87 8 38 24 9 32 3 7 58 12 10 12 22 - 9 0 0 9 27 52 0 20 12 13 248 -87 9 1 3 9 54 41 8 20 52 10 34 59 - 8 0 0 9 50 25 0 20 14 12 248 -87 9 23 37 10 17 14 8 43 27 10 57 30 - 7 0 0 10 12 51 0 20 16 11 248 -87 9 46 4 10 39 39 9 5 56 11 19 55 - 6 0 0 10 35 11 0 20 18 10 248 -86 10 8 25 11 1 58 9 28 17 11 42 12 - 5 0 0 10 57 23 0 20 20 9 249 -85 10 30 38 11 24 10 9 50 32 12 4 22 - 4 0 0 11 19 28 0 20 21 8 249 -84 10 52 43 11 46 13 10 12 39 12 26 24 - 3 0 0 11 41 24 0 20 22 7 249 -83 11 14 40 12 8 8 10 34 38 12 48 18 - 2 0 0 12 3 11 0 20 23 5 249 -82 11 36 29 12 29 55 10 56 28 13 10 3 - 1 0 0 12 24 49 0 20 24 4 249 -81 11 58 8 12 51 32 11 18 9 13 31 38 0 0 0 12 46 18 0 20 25 3 250 -80 12 19 38 13 12 59 11 39 40 13 53 3 1 0 0 13 7 36 0 20 25 2 250 -79 12 40 58 13 34 16 12 1 2 14 14 19 2 0 0 13 28 44 0 20 26 1 250 -78 13 2 7 13 55 23 12 22 13 14 35 23 3 0 0 13 49 41 0 20 26 0 250 -77 13 23 5 14 16 19 12 43 13 .. .. .. Uncertainty in time = +/- 6 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: 2UCAC 24733323 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 12 14.7099 DE: -18 58 53.257 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .040, .042 ) * V mag [mag]: 12.6 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (379) Huenna approx. diameter [km]: 92 approx. diameter ["]: .058 distance from Earth [AU]: 2.17900 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1075 number of rejected observations: 112 time covered by the observations: 1900 Feb 23 - 2008 Sep 15 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.013, 79° remarks: * orbital elements for (379) Huenna : Mean anomaly = 340.53273282 deg Arg. of pericenter = 179.62181028 deg Long. of node = 172.07680141 deg Inclination = 1.66856480 deg Eccentricity = 0.18833604 Semimajor axis = 3.13509559 AU Perihelion dist = 2.54464409 AU Mag: H = 8.83, G = 0.15 Epoch of elements : MJD 54750.00800000 TDT (2008 Oct 11.008) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 11 379 Huenna 0h 11.4m UT 12.6 20 12 14.710-18 58 53.262UCAC 24733323 0.0 13.7 92 7.9 2.179 1.856 3.83 -79.7469 -18.982 173.85 -7.08 0.1896 -0.01686 0.10973 6.52032 0.94713 0.00541 0.00118 2000 338.755783200810 1.00000179.621810172.076801 1.6685650.18833604 3.1350956 2.5446441 8.9 5.00.15 RATE 1.7755300 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.044 0.044 88 1.75 0.044 1 7 3336 54740.5020081011_733323 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 04:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org