IOTA/IOTA-ES occultation update for (84) Klio / TYC 0256-01340-1 event on 2009 Jun 01, 00:37 UT Visible from Summary ------- On 2009 Jun 01 UT, the 79 km diameter asteroid (84) Klio will occult a 9.8 mag star in the constellation Sextans for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.0 mag to 14.8 mag (the magnitude of the asteroid) for at most 5.3 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: 89 * date and approx. time of event: 2009 Jun 01, 00:38 - 2009 Jun 01, 00:44 UT * magnitude of target star: 9.8 * magnitude drop [mag]: 5.0 * estimated maximum duration [s]: 5.3 * Moon: 60 % sunlit, 14° distance * Sun: 87° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 80 * 1 sigma uncertainty interval [path widths]: +/- 0.53 * 1 sigma uncertainty interval [seconds]: +/- 3.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .021", 101° ) * approx speed of asteroid's shadow [km/s]: 14.8571 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0256-01340-1 by 84 Klio on 2009 Jun 1 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 -102 0 0 - 6 1 40 0 38 7 80 4 0 - 6 25 14 - 5 38 7 - 6 50 15 - 5 13 12 -101 0 0 - 6 26 53 0 38 16 80 358 -2 - 6 50 27 - 6 3 20 - 7 15 29 - 5 38 24 -100 0 0 - 6 52 9 0 38 24 79 352 -3 - 7 15 44 - 6 28 36 - 7 40 47 - 6 3 39 - 99 0 0 - 7 17 29 0 38 32 79 347 -4 - 7 41 5 - 6 53 55 - 8 6 7 - 6 28 57 - 98 0 0 - 7 42 51 0 38 41 78 343 -5 - 8 6 27 - 7 19 16 - 8 31 30 - 6 54 19 - 97 0 0 - 8 8 15 0 38 49 77 339 -6 - 8 31 51 - 7 44 40 - 8 56 55 - 7 19 42 - 96 0 0 - 8 33 39 0 38 57 76 336 -7 - 8 57 16 - 8 10 4 - 9 22 20 - 7 45 6 - 95 0 0 - 8 59 4 0 39 5 76 332 -8 - 9 22 41 - 8 35 29 - 9 47 45 - 8 10 31 - 94 0 0 - 9 24 29 0 39 13 75 330 -9 - 9 48 6 - 9 0 54 -10 13 10 - 8 35 55 - 93 0 0 - 9 49 52 0 39 21 74 327 -10 -10 13 30 - 9 26 17 -10 38 34 - 9 1 19 - 92 0 0 -10 15 14 0 39 29 73 325 -12 -10 38 51 - 9 51 39 -11 3 55 - 9 26 41 - 91 0 0 -10 40 34 0 39 37 72 323 -13 -11 4 10 -10 16 58 -11 29 14 - 9 52 0 - 90 0 0 -11 5 50 0 39 45 71 321 -14 -11 29 26 -10 42 15 -11 54 30 -10 17 17 - 89 0 0 -11 31 2 0 39 53 70 319 -15 -11 54 38 -11 7 28 -12 19 41 -10 42 30 - 88 0 0 -11 56 10 0 40 1 69 318 -16 -12 19 46 -11 32 36 -12 44 48 -11 7 39 - 87 0 0 -12 21 13 0 40 8 68 317 -17 -12 44 48 -11 57 39 -13 9 50 -11 32 43 - 86 0 0 -12 46 10 0 40 16 67 315 -18 -13 9 45 -12 22 37 -13 34 46 -11 57 41 - 85 0 0 -13 11 1 0 40 24 66 314 -19 -13 34 34 -12 47 28 -13 59 35 -12 22 33 - 84 0 0 -13 35 44 0 40 31 65 313 -20 -13 59 17 -13 12 13 -14 24 17 -12 47 18 - 83 0 0 -14 0 20 0 40 39 64 312 -21 -14 23 52 -13 36 49 -14 48 51 -13 11 56 - 82 0 0 -14 24 48 0 40 46 63 311 -22 -14 48 19 -14 1 18 -15 13 17 -13 36 25 - 81 0 0 -14 49 6 0 40 53 62 310 -23 -15 12 37 -14 25 38 -15 37 34 -14 0 46 - 80 0 0 -15 13 16 0 41 0 61 309 -25 -15 36 45 -14 49 48 -16 1 41 -14 24 57 - 79 0 0 -15 37 15 0 41 7 60 308 -26 -16 0 43 -15 13 48 -16 25 38 -14 48 59 - 78 0 0 -16 1 4 0 41 14 59 308 -27 -16 24 31 -15 37 38 -16 49 24 -15 12 50 - 77 0 0 -16 24 41 0 41 21 58 307 -28 -16 48 7 -16 1 17 -17 12 59 -15 36 30 - 76 0 0 -16 48 7 0 41 28 57 306 -29 -17 11 31 -16 24 44 -17 36 22 -15 59 59 - 75 0 0 -17 11 21 0 41 35 56 305 -30 -17 34 44 -16 48 0 -17 59 33 -16 23 16 - 74 0 0 -17 34 22 0 41 41 55 305 -31 -17 57 44 -17 11 2 -18 22 31 -16 46 20 - 73 0 0 -17 57 10 0 41 48 54 304 -32 -18 20 30 -17 33 52 -18 45 16 -17 9 11 - 72 0 0 -18 19 45 0 41 54 53 303 -33 -18 43 3 -17 56 28 -19 7 47 -17 31 49 - 71 0 0 -18 42 5 0 42 0 52 303 -34 -19 5 22 -18 18 50 -19 30 4 -17 54 13 - 70 0 0 -19 4 11 0 42 7 51 302 -35 -19 27 26 -18 40 58 -19 52 7 -18 16 22 - 69 0 0 -19 26 2 0 42 13 50 302 -36 -19 49 16 -19 2 51 -20 13 54 -18 38 17 - 68 0 0 -19 47 38 0 42 18 49 301 -37 -20 10 50 -19 24 28 -20 35 27 -18 59 56 - 67 0 0 -20 8 59 0 42 24 48 301 -38 -20 32 8 -19 45 50 -20 56 43 -19 21 20 - 66 0 0 -20 30 3 0 42 30 47 300 -39 -20 53 11 -20 6 56 -21 17 44 -19 42 28 - 65 0 0 -20 50 51 0 42 36 46 299 -40 -21 13 57 -20 27 46 -21 38 28 -20 3 20 - 64 0 0 -21 11 22 0 42 41 45 299 -41 -21 34 26 -20 48 19 -21 58 55 -20 23 55 - 63 0 0 -21 31 36 0 42 46 44 298 -42 -21 54 38 -21 8 35 -22 19 5 -20 44 13 - 62 0 0 -21 51 33 0 42 52 43 298 -43 -22 14 33 -21 28 34 -22 38 58 -21 4 14 - 61 0 0 -22 11 12 0 42 57 42 297 -44 -22 34 10 -21 48 15 -22 58 33 -21 23 57 - 60 0 0 -22 30 33 0 43 2 41 297 -45 -22 53 30 -22 7 39 -23 17 50 -21 43 23 - 59 0 0 -22 49 37 0 43 7 40 296 -46 -23 12 31 -22 26 44 -23 36 49 -22 2 30 - 58 0 0 -23 8 21 0 43 11 39 296 -47 -23 31 14 -22 45 31 -23 55 30 -22 21 19 - 57 0 0 -23 26 48 0 43 16 38 295 -48 -23 49 38 -23 3 59 -24 13 52 -22 39 50 - 56 0 0 -23 44 55 0 43 21 37 295 -49 -24 7 43 -23 22 8 -24 31 55 -22 58 1 - 55 0 0 -24 2 44 0 43 25 36 294 -50 -24 25 30 -23 39 59 -24 49 39 -23 15 54 - 54 0 0 -24 20 13 0 43 29 35 294 -51 -24 42 57 -23 57 30 -25 7 4 -23 33 27 - 53 0 0 -24 37 23 0 43 33 34 293 -52 -25 0 5 -24 14 42 -25 24 10 -23 50 41 - 52 0 0 -24 54 13 0 43 37 33 293 -53 -25 16 53 -24 31 34 -25 40 56 -24 7 36 - 51 0 0 -25 10 43 0 43 41 32 292 -54 -25 33 21 -24 48 7 -25 57 22 -24 24 11 - 50 0 0 -25 26 54 0 43 45 31 292 -55 -25 49 30 -25 4 20 -26 13 29 -24 40 26 - 49 0 0 -25 42 45 0 43 49 30 291 -56 -26 5 19 -25 20 13 -26 29 16 -24 56 21 - 48 0 0 -25 58 16 0 43 52 29 291 -56 -26 20 48 -25 35 45 -26 44 42 -25 11 55 - 47 0 0 -26 13 26 0 43 56 28 290 -57 -26 35 56 -25 50 58 -26 59 48 -25 27 10 - 46 0 0 -26 28 16 0 43 59 27 290 -58 -26 50 44 -26 5 50 -27 14 34 -25 42 4 - 45 0 0 -26 42 46 0 44 2 26 289 -59 -27 5 12 -26 20 22 -27 29 0 -25 56 38 - 44 0 0 -26 56 55 0 44 5 25 289 -60 -27 19 19 -26 34 33 -27 43 6 -26 10 51 - 43 0 0 -27 10 44 0 44 8 25 288 -61 -27 33 6 -26 48 24 -27 56 50 -26 24 44 - 42 0 0 -27 24 12 0 44 11 24 288 -62 -27 46 33 -27 1 54 -28 10 15 -26 38 16 - 41 0 0 -27 37 20 0 44 14 23 287 -63 -27 59 38 -27 15 3 -28 23 18 -26 51 27 - 40 0 0 -27 50 7 0 44 17 22 287 -64 -28 12 23 -27 27 52 -28 36 1 -27 4 18 - 39 0 0 -28 2 33 0 44 19 21 286 -64 -28 24 47 -27 40 19 -28 48 24 -27 16 48 - 38 0 0 -28 14 38 0 44 22 20 286 -65 -28 36 51 -27 52 26 -29 0 25 -27 28 56 - 37 0 0 -28 26 22 0 44 24 19 285 -66 -28 48 34 -28 4 13 -29 12 6 -27 40 44 - 36 0 0 -28 37 46 0 44 26 18 285 -67 -28 59 55 -28 15 38 -29 23 26 -27 52 11 - 35 0 0 -28 48 49 0 44 28 17 284 -68 -29 10 56 -28 26 42 -29 34 25 -28 3 18 - 34 0 0 -28 59 30 0 44 30 16 284 -69 -29 21 37 -28 37 26 -29 45 4 -28 14 3 - 33 0 0 -29 9 51 0 44 32 15 283 -69 -29 31 56 -28 47 48 -29 55 21 -28 24 27 - 32 0 0 -29 19 51 0 44 34 15 283 -70 -29 41 54 -28 57 50 -30 5 18 -28 34 30 - 31 0 0 -29 29 30 0 44 35 14 282 -71 -29 51 32 -29 7 30 -30 14 54 -28 44 12 - 30 0 0 -29 38 48 0 44 37 13 282 -72 -30 0 49 -29 16 50 -30 24 9 -28 53 33 - 29 0 0 -29 47 46 0 44 38 12 281 -73 -30 9 44 -29 25 48 -30 33 4 -29 2 33 - 28 0 0 -29 56 22 0 44 40 11 281 -73 -30 18 19 -29 34 26 -30 41 37 -29 11 12 - 27 0 0 -30 4 38 0 44 41 10 280 -74 -30 26 34 -29 42 43 -30 49 50 -29 19 30 - 26 0 0 -30 12 32 0 44 42 9 280 -75 -30 34 27 -29 50 39 -30 57 42 -29 27 28 - 25 0 0 -30 20 6 0 44 43 8 279 -75 -30 41 59 -29 58 14 -31 5 13 -29 35 4 - 24 0 0 -30 27 19 0 44 44 7 279 -76 -30 49 11 -30 5 28 -31 12 24 -29 42 19 - 23 0 0 -30 34 11 0 44 45 7 278 -77 -30 56 2 -30 12 21 -31 19 14 -29 49 13 - 22 0 0 -30 40 42 0 44 46 6 278 -77 -31 2 32 -30 18 53 -31 25 43 -29 55 47 - 21 0 0 -30 46 52 0 44 46 5 277 -78 -31 8 42 -30 25 4 -31 31 51 -30 1 59 - 20 0 0 -30 52 42 0 44 47 4 277 -78 -31 14 31 -30 30 55 -31 37 39 -30 7 51 - 19 0 0 -30 58 11 0 44 47 3 276 -79 -31 19 59 -30 36 25 -31 43 6 -30 13 22 - 18 0 0 -31 3 19 0 44 47 2 276 -79 -31 25 6 -30 41 34 -31 48 13 -30 18 32 - 17 0 0 -31 8 7 0 44 48 1 275 -80 -31 29 53 -30 46 22 -31 52 59 -30 23 21 - 16 0 0 -31 12 34 0 44 48 1 275 -80 -31 34 19 -30 50 50 -31 57 24 -30 27 49 Uncertainty in time = +/- 3 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 0256-01340-1 * constellation : Sextans * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 10 30 41.9759 DE: +03 54 11.255 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .018 ) * V mag [mag]: 9.8 * B mag [mag]: 10.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (84) Klio approx. diameter [km]: 79 approx. diameter ["]: .040 distance from Earth [AU]: 2.74700 * orbital information: orbit source: Preston date of fit: 2008 Apr 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 719 number of rejected observations: 68 time covered by the observations: 1900 Mar 06 - 2008 Feb 18 1 sigma uncertainty ellipse (major, minor, PA): 0.015, 0.011, 124° remarks: * orbital elements for (84) Klio : Mean anomaly = 205.68484237 deg Arg. of pericenter = 14.77760344 deg Long. of node = 327.64121010 deg Inclination = 9.33515343 deg Eccentricity = 0.23674502 Semimajor axis = 2.36208505 AU Perihelion dist = 1.80287317 AU Mag: H = 9.20, G = 0.15 Epoch of elements : MJD 54983.02600000 TDT (2009 Jun 01.026) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 1 84 Klio 0h 37.7m UT 9.8 10 30 41.976 3 54 11.25TYC 0256-01340-1 10.2 14.8 79 5.3 2.747 1.666 -9.97 -101.3971 3.906 170.02 22.05 0.6289 -0.06159 -0.15066 7.78682 -3.11223 0.00519 -0.00209 2000 204.8633002009 529.00000 14.777603327.641210 9.3351530.23674502 2.3620851 1.8028732 9.3 5.00.15 RATE 2.7149440 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.026 0.021 101 1.53 0.021 0 54581.5020090601_1340-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 07:00 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org