IOTA/IOTA-ES occultation update for (119) Althaea / TYC 1360-00392-1 event on 2008 Mar 30, 23:06 UT Visible from N Brazil Summary ------- On 2008 Mar 30 UT, the 57 km diameter asteroid (119) Althaea will occult a 11.7 mag star in the constellation Gemini for observers along a path across N Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 13.4 mag (the magnitude of the asteroid) for at most 5.2 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, 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 Mar 30, 23:04 - 2008 Mar 30, 23:16 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 5.2 * Moon: 40 % sunlit, 170° distance * Sun: 102° distance * rough path description: N Brazil The occultation path -------------------- * approximate projected width [km]: 59 * 1 sigma uncertainty interval [path widths]: +/- 0.75 * 1 sigma uncertainty interval [seconds]: +/- 5.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .025", 92° ) * approx speed of asteroid's shadow [km/s]: 11.0843 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1360-00392-1 by 119 Althaea on 2008 Mar 30 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 - 75 0 0 - 0 36 57 23 4 23 69 39 0 - 0 53 11 - 0 20 44 - 1 17 35 0 3 34 - 74 0 0 - 0 24 51 23 4 33 70 37 -1 - 0 41 5 - 0 8 39 - 1 5 27 0 15 38 - 73 0 0 - 0 13 3 23 4 44 71 35 -2 - 0 29 15 0 3 9 - 0 53 37 0 27 25 - 72 0 0 - 0 1 31 23 4 54 72 32 -3 - 0 17 43 0 14 40 - 0 42 3 0 38 54 - 71 0 0 0 9 43 23 5 4 72 30 -4 - 0 6 28 0 25 53 - 0 30 47 0 50 6 - 70 0 0 0 20 39 23 5 15 73 27 -5 0 4 29 0 36 48 - 0 19 49 1 1 0 - 69 0 0 0 31 18 23 5 25 74 24 -6 0 15 8 0 47 26 - 0 9 8 1 11 37 - 68 0 0 0 41 38 23 5 36 74 21 -7 0 25 29 0 57 46 0 1 14 1 21 55 - 67 0 0 0 51 40 23 5 46 75 18 -8 0 35 32 1 7 47 0 11 18 1 31 55 - 66 0 0 1 1 24 23 5 57 75 14 -9 0 45 17 1 17 30 0 21 3 1 41 37 - 65 0 0 1 10 49 23 6 7 76 10 -10 0 54 42 1 26 54 0 30 30 1 51 0 - 64 0 0 1 19 55 23 6 18 76 6 -11 1 3 49 1 36 0 0 39 38 2 0 5 - 63 0 0 1 28 42 23 6 29 76 2 -12 1 12 37 1 44 46 0 48 27 2 8 50 - 62 0 0 1 37 11 23 6 39 76 358 -13 1 21 6 1 53 14 0 56 57 2 17 17 - 61 0 0 1 45 20 23 6 50 76 354 -14 1 29 16 2 1 22 1 5 8 2 25 24 - 60 0 0 1 53 9 23 7 0 76 350 -16 1 37 6 2 9 11 1 12 59 2 33 13 - 59 0 0 2 0 40 23 7 11 76 345 -17 1 44 37 2 16 41 1 20 31 2 40 41 - 58 0 0 2 7 50 23 7 21 76 341 -18 1 51 48 2 23 51 1 27 43 2 47 50 - 57 0 0 2 14 41 23 7 32 76 337 -19 1 58 40 2 30 41 1 34 36 2 54 40 - 56 0 0 2 21 12 23 7 42 75 333 -20 2 5 11 2 37 12 1 41 8 3 1 9 - 55 0 0 2 27 23 23 7 53 75 330 -21 2 11 23 2 43 23 1 47 21 3 7 19 - 54 0 0 2 33 15 23 8 3 75 326 -22 2 17 15 2 49 13 1 53 13 3 13 9 - 53 0 0 2 38 46 23 8 14 74 323 -23 2 22 46 2 54 44 1 58 45 3 18 39 - 52 0 0 2 43 57 23 8 24 73 320 -24 2 27 58 2 59 54 2 3 57 3 23 49 - 51 0 0 2 48 47 23 8 34 73 318 -25 2 32 49 3 4 45 2 8 49 3 28 39 - 50 0 0 2 53 18 23 8 45 72 315 -26 2 37 20 3 9 15 2 13 21 3 33 8 - 49 0 0 2 57 28 23 8 55 71 313 -27 2 41 30 3 13 24 2 17 32 3 37 17 - 48 0 0 3 1 18 23 9 5 71 311 -28 2 45 20 3 17 14 2 21 22 3 41 6 - 47 0 0 3 4 47 23 9 15 70 309 -29 2 48 50 3 20 43 2 24 52 3 44 35 - 46 0 0 3 7 56 23 9 25 69 307 -30 2 51 59 3 23 51 2 28 2 3 47 43 - 45 0 0 3 10 44 23 9 35 68 305 -31 2 54 48 3 26 39 2 30 51 3 50 30 - 44 0 0 3 13 12 23 9 45 67 304 -32 2 57 16 3 29 7 2 33 19 3 52 58 - 43 0 0 3 15 19 23 9 55 67 303 -33 2 59 23 3 31 14 2 35 27 3 55 4 - 42 0 0 3 17 6 23 10 5 66 301 -34 3 1 10 3 33 0 2 37 14 3 56 51 - 41 0 0 3 18 32 23 10 15 65 300 -35 3 2 36 3 34 26 2 38 41 3 58 16 - 40 0 0 3 19 37 23 10 25 64 299 -36 3 3 42 3 35 32 2 39 46 3 59 22 - 39 0 0 3 20 22 23 10 34 63 298 -37 3 4 27 3 36 17 2 40 32 4 0 6 - 38 0 0 3 20 47 23 10 44 62 297 -38 3 4 51 3 36 41 2 40 56 4 0 31 - 37 0 0 3 20 51 23 10 53 61 296 -39 3 4 55 3 36 45 2 41 0 4 0 34 - 36 0 0 3 20 34 23 11 3 60 296 -40 3 4 39 3 36 28 2 40 43 4 0 18 - 35 0 0 3 19 57 23 11 12 59 295 -41 3 4 1 3 35 51 2 40 6 3 59 41 - 34 0 0 3 18 59 23 11 21 58 294 -42 3 3 4 3 34 54 2 39 8 3 58 43 - 33 0 0 3 17 41 23 11 30 57 294 -43 3 1 46 3 33 36 2 37 50 3 57 25 - 32 0 0 3 16 3 23 11 39 57 293 -44 3 0 7 3 31 57 2 36 11 3 55 47 - 31 0 0 3 14 4 23 11 48 56 293 -45 2 58 8 3 29 59 2 34 12 3 53 49 - 30 0 0 3 11 45 23 11 57 55 292 -46 2 55 49 3 27 40 2 31 53 3 51 30 - 29 0 0 3 9 6 23 12 5 54 292 -47 2 53 9 3 25 1 2 29 13 3 48 52 - 28 0 0 3 6 6 23 12 14 53 291 -48 2 50 10 3 22 2 2 26 13 3 45 53 - 27 0 0 3 2 47 23 12 22 52 291 -49 2 46 50 3 18 42 2 22 53 3 42 34 - 26 0 0 2 59 7 23 12 31 51 291 -50 2 43 10 3 15 3 2 19 13 3 38 55 - 25 0 0 2 55 8 23 12 39 50 290 -51 2 39 10 3 11 4 2 15 12 3 34 56 - 24 0 0 2 50 48 23 12 47 49 290 -53 2 34 51 3 6 45 2 10 52 3 30 38 - 23 0 0 2 46 9 23 12 55 48 290 -54 2 30 11 3 2 6 2 6 12 3 26 0 - 22 0 0 2 41 11 23 13 3 47 290 -55 2 25 12 2 57 8 2 1 13 3 21 2 - 21 0 0 2 35 52 23 13 11 46 289 -56 2 19 53 2 51 50 1 55 53 3 15 44 - 20 0 0 2 30 14 23 13 18 45 289 -57 2 14 15 2 46 13 1 50 14 3 10 8 - 19 0 0 2 24 17 23 13 26 44 289 -58 2 8 18 2 40 16 1 44 16 3 4 12 - 18 0 0 2 18 1 23 13 33 43 289 -59 2 2 1 2 34 0 1 37 59 2 57 57 - 17 0 0 2 11 26 23 13 40 42 289 -60 1 55 25 2 27 25 1 31 22 2 51 22 - 16 0 0 2 4 31 23 13 47 41 289 -61 1 48 30 2 20 31 1 24 26 2 44 29 - 15 0 0 1 57 18 23 13 54 40 288 -62 1 41 16 2 13 19 1 17 12 2 37 18 - 14 0 0 1 49 46 23 14 1 39 288 -63 1 33 44 2 5 47 1 9 39 2 29 47 - 13 0 0 1 41 56 23 14 7 38 288 -64 1 25 53 1 57 58 1 1 47 2 21 58 - 12 0 0 1 33 47 23 14 14 37 288 -65 1 17 44 1 49 49 0 53 36 2 13 51 - 11 0 0 1 25 20 23 14 20 36 288 -66 1 9 16 1 41 23 0 45 8 2 5 25 - 10 0 0 1 16 35 23 14 26 35 288 -67 1 0 30 1 32 39 0 36 21 1 56 42 - 9 0 0 1 7 32 23 14 32 34 288 -68 0 51 27 1 23 36 0 27 17 1 47 41 - 8 0 0 0 58 12 23 14 38 32 288 -69 0 42 6 1 14 16 0 17 55 1 38 22 - 7 0 0 0 48 34 23 14 44 31 288 -70 0 32 27 1 4 39 0 8 15 1 28 45 - 6 0 0 0 38 38 23 14 49 30 287 -71 0 22 31 0 54 44 - 0 1 42 1 18 52 - 5 0 0 0 28 26 23 14 55 29 287 -72 0 12 18 0 44 33 - 0 11 57 1 8 41 - 4 0 0 0 17 56 23 15 0 28 287 -73 0 1 47 0 34 4 - 0 22 28 0 58 13 - 3 0 0 0 7 10 23 15 5 27 287 -74 - 0 8 59 0 23 18 - 0 33 16 0 47 29 - 2 0 0 - 0 3 53 23 15 10 26 287 -75 - 0 20 3 0 12 17 - 0 44 20 0 36 28 - 1 0 0 - 0 15 11 23 15 14 25 287 -76 - 0 31 22 0 0 58 - 0 55 41 0 25 11 0 0 0 - 0 26 46 23 15 19 24 287 -77 - 0 42 58 - 0 10 36 - 1 7 18 0 13 38 1 0 0 - 0 38 37 23 15 23 23 287 -78 - 0 54 49 - 0 22 26 - 1 19 10 0 1 49 2 0 0 - 0 50 43 23 15 27 22 287 -79 - 1 6 56 - 0 34 31 - 1 31 18 - 0 10 15 3 0 0 - 1 3 5 23 15 31 21 287 -80 - 1 19 19 - 0 46 52 - 1 43 42 - 0 22 35 4 0 0 - 1 15 41 23 15 35 20 287 -81 - 1 31 56 - 0 59 28 - 1 56 20 - 0 35 9 5 0 0 - 1 28 32 23 15 39 19 287 -82 - 1 44 48 - 1 12 18 - 2 9 13 - 0 47 59 6 0 0 - 1 41 38 23 15 42 18 287 -83 - 1 57 55 - 1 25 23 - 2 22 21 - 1 1 3 7 0 0 - 1 54 58 23 15 45 17 287 -84 - 2 11 15 - 1 38 43 - 2 35 43 - 1 14 21 8 0 0 - 2 8 32 23 15 48 16 287 -85 - 2 24 50 - 1 52 16 - 2 49 19 - 1 27 53 9 0 0 - 2 22 20 23 15 51 15 287 -86 - 2 38 39 - 2 6 3 - 3 3 9 - 1 41 39 10 0 0 - 2 36 21 23 15 54 14 287 -87 - 2 52 41 - 2 20 3 - 3 17 12 - 1 55 38 11 0 0 - 2 50 35 23 15 56 13 286 -88 - 3 6 56 - 2 34 17 - 3 31 28 - 2 9 50 12 0 0 - 3 5 2 23 15 59 12 286 -89 - 3 21 23 - 2 48 43 - 3 45 57 - 2 24 15 13 0 0 - 3 19 42 23 16 1 11 286 -89 - 3 36 3 - 3 3 21 - 4 0 38 - 2 38 53 14 0 0 - 3 34 33 23 16 3 10 286 -88 - 3 50 56 - 3 18 12 - 4 15 31 - 2 53 43 15 0 0 - 3 49 37 23 16 4 9 286 -87 - 4 6 0 - 3 33 15 - 4 30 37 - 3 8 44 16 0 0 - 4 4 52 23 16 6 8 286 -86 - 4 21 16 - 3 48 29 - 4 45 53 - 3 23 57 17 0 0 - 4 20 18 23 16 7 7 286 -85 - 4 36 42 - 4 3 55 - 5 1 21 - 3 39 22 18 0 0 - 4 35 55 23 16 8 6 286 -84 - 4 52 20 - 4 19 31 - 5 17 0 - 3 54 57 19 0 0 - 4 51 42 23 16 9 5 286 -83 - 5 8 8 - 4 35 18 - 5 32 49 - 4 10 43 20 0 0 - 5 7 40 23 16 10 4 286 -82 - 5 24 7 - 4 51 15 - 5 48 48 - 4 26 39 21 0 0 - 5 23 47 23 16 11 3 286 -81 - 5 40 15 - 5 7 21 - 6 4 58 - 4 42 44 22 0 0 - 5 40 4 23 16 11 2 286 -80 - 5 56 32 - 5 23 38 - 6 21 16 - 4 59 0 23 0 0 - 5 56 30 23 16 11 1 285 -79 - 6 12 59 - 5 40 3 - 6 37 44 - 5 15 24 Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: TYC 1360-00392-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 31 08.9970 DE: +15 21 27.163 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .032, .023 ) * V mag [mag]: 11.7 * B mag [mag]: 12.6 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (119) Althaea approx. diameter [km]: 57 approx. diameter ["]: .034 distance from Earth [AU]: 2.28300 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1052 number of rejected observations: 145 time covered by the observations: 1900 Jan 27 - 2008 Mar 12 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.011, 100° remarks: * orbital elements for (119) Althaea : Mean anomaly = 110.22521104 deg Arg. of pericenter = 171.22912140 deg Long. of node = 203.72806867 deg Inclination = 5.77779890 deg Eccentricity = 0.08133403 Semimajor axis = 2.58164901 AU Perihelion dist = 2.37167308 AU Mag: H = 8.22, G = 0.15 Epoch of elements : MJD 54555.96300000 TDT (2008 Mar 30.963) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 30 119 Althaea 23h 6.9m UT 11.7 7 31 8.997 15 21 27.16TYC 1360-00392-1 12.6 13.4 57 5.2 2.283 1.653 3.11 -62.6321 15.356 -165.66 4.20 23.1144 0.02986 -0.23452 6.20393 0.80764 0.00556 -0.00074 2000 108.8083642008 325.00000171.229121203.728069 5.7777990.08133403 2.5816490 2.3716731 8.4 5.00.15 RATE 2.3760640 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.035 0.025 92 1.75 0.026 0 54553.5020080330_0392-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org