IOTA/IOTA-ES occultation update for (903) Nealley / TYC 0855-00895-1 event on 2009 Jun 08, 11:57 UT Visible from Summary ------- On 2009 Jun 08 UT, the 63 km diameter asteroid (903) Nealley will occult a 10.4 mag star in the constellation Leo for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.5 mag to 15.9 mag (the magnitude of the asteroid) for at most 4.3 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: 63 * date and approx. time of event: 2009 Jun 08, 11:57 - 2009 Jun 08, 12:04 UT * magnitude of target star: 10.4 * magnitude drop [mag]: 5.5 * estimated maximum duration [s]: 4.3 * Moon: 99 % sunlit, 99° distance * Sun: 90° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 64 * 1 sigma uncertainty interval [path widths]: +/- 0.96 * 1 sigma uncertainty interval [seconds]: +/- 4.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .028 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .026", 94° ) * approx speed of asteroid's shadow [km/s]: 14.8891 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0855-00895-1 by 903 Nealley on 2009 Jun 8 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 91 0 0 - 0 46 44 11 57 31 79 18 -1 - 1 5 25 - 0 28 3 - 1 41 23 0 7 45 92 0 0 - 1 10 17 11 57 39 79 12 -2 - 1 29 0 - 0 51 35 - 2 5 0 - 0 15 44 93 0 0 - 1 34 4 11 57 48 79 7 -3 - 1 52 49 - 1 15 21 - 2 28 52 - 0 39 27 94 0 0 - 1 58 6 11 57 56 78 2 -4 - 2 16 52 - 1 39 21 - 2 52 58 - 1 3 25 95 0 0 - 2 22 21 11 58 4 78 357 -5 - 2 41 9 - 2 3 35 - 3 17 17 - 1 27 36 96 0 0 - 2 46 49 11 58 12 77 352 -6 - 3 5 38 - 2 28 1 - 3 41 49 - 1 52 0 97 0 0 - 3 11 29 11 58 21 77 348 -8 - 3 30 19 - 2 52 40 - 4 6 33 - 2 16 36 98 0 0 - 3 36 20 11 58 29 76 344 -9 - 3 55 12 - 3 17 30 - 4 31 28 - 2 41 23 99 0 0 - 4 1 22 11 58 37 75 341 -10 - 4 20 15 - 3 42 31 - 4 56 34 - 3 6 22 100 0 0 - 4 26 35 11 58 45 75 338 -11 - 4 45 29 - 4 7 42 - 5 21 49 - 3 31 31 101 0 0 - 4 51 57 11 58 53 74 335 -12 - 5 10 52 - 4 33 3 - 5 47 15 - 3 56 50 102 0 0 - 5 17 28 11 59 1 73 332 -13 - 5 36 24 - 4 58 33 - 6 12 48 - 4 22 18 103 0 0 - 5 43 7 11 59 10 72 330 -14 - 6 2 4 - 5 24 11 - 6 38 30 - 4 47 54 104 0 0 - 6 8 53 11 59 18 71 328 -15 - 6 27 51 - 5 49 57 - 7 4 19 - 5 13 38 105 0 0 - 6 34 46 11 59 26 70 326 -16 - 6 53 45 - 6 15 49 - 7 30 15 - 5 39 29 106 0 0 - 7 0 46 11 59 34 69 324 -18 - 7 19 45 - 6 41 48 - 7 56 17 - 6 5 26 107 0 0 - 7 26 50 11 59 41 68 323 -19 - 7 45 50 - 7 7 52 - 8 22 23 - 6 31 29 108 0 0 - 7 53 0 11 59 49 67 321 -20 - 8 12 0 - 7 34 0 - 8 48 34 - 6 57 36 109 0 0 - 8 19 13 11 59 57 66 320 -21 - 8 38 14 - 8 0 13 - 9 14 49 - 7 23 48 110 0 0 - 8 45 29 12 0 5 65 319 -22 - 9 4 31 - 8 26 29 - 9 41 7 - 7 50 3 111 0 0 - 9 11 48 12 0 12 64 317 -23 - 9 30 50 - 8 52 47 -10 7 27 - 8 16 20 112 0 0 - 9 38 8 12 0 20 63 316 -24 - 9 57 11 - 9 19 7 -10 33 48 - 8 42 40 113 0 0 -10 4 30 12 0 28 62 315 -25 -10 23 32 - 9 45 28 -11 0 10 - 9 9 0 114 0 0 -10 30 51 12 0 35 61 314 -26 -10 49 54 -10 11 50 -11 26 32 - 9 35 21 115 0 0 -10 57 12 12 0 42 60 314 -27 -11 16 15 -10 38 11 -11 52 53 -10 1 42 116 0 0 -11 23 32 12 0 50 59 313 -29 -11 42 35 -11 4 30 -12 19 13 -10 28 2 117 0 0 -11 49 50 12 0 57 58 312 -30 -12 8 53 -11 30 48 -12 45 31 -10 54 20 118 0 0 -12 16 5 12 1 4 57 311 -31 -12 35 8 -11 57 3 -13 11 46 -11 20 35 119 0 0 -12 42 17 12 1 11 56 310 -32 -13 1 19 -12 23 15 -13 37 57 -11 46 48 120 0 0 -13 8 24 12 1 18 55 310 -33 -13 27 27 -12 49 23 -14 4 4 -12 12 56 121 0 0 -13 34 27 12 1 24 54 309 -34 -13 53 29 -13 15 27 -14 30 6 -12 39 0 122 0 0 -14 0 25 12 1 31 53 308 -35 -14 19 26 -13 41 25 -14 56 2 -13 4 59 123 0 0 -14 26 16 12 1 38 52 308 -36 -14 45 17 -14 7 16 -15 21 52 -13 30 51 124 0 0 -14 52 1 12 1 44 51 307 -37 -15 11 1 -14 33 1 -15 47 35 -13 56 37 125 0 0 -15 17 38 12 1 50 50 307 -38 -15 36 38 -14 58 39 -16 13 10 -14 22 16 126 0 0 -15 43 7 12 1 57 49 306 -39 -16 2 6 -15 24 9 -16 38 37 -14 47 47 127 0 0 -16 8 27 12 2 3 48 306 -40 -16 27 25 -15 49 30 -17 3 55 -15 13 10 128 0 0 -16 33 38 12 2 9 47 305 -42 -16 52 35 -16 14 41 -17 29 3 -15 38 23 129 0 0 -16 58 39 12 2 14 46 304 -43 -17 17 35 -16 39 43 -17 54 2 -16 3 26 130 0 0 -17 23 29 12 2 20 45 304 -44 -17 42 25 -17 4 35 -18 18 49 -16 28 20 131 0 0 -17 48 9 12 2 26 44 303 -45 -18 7 3 -17 29 15 -18 43 26 -16 53 2 132 0 0 -18 12 36 12 2 31 43 303 -46 -18 31 30 -17 53 44 -19 7 50 -17 17 33 133 0 0 -18 36 52 12 2 37 42 302 -47 -18 55 44 -18 18 0 -19 32 3 -17 41 52 134 0 0 -19 0 55 12 2 42 41 302 -48 -19 19 46 -18 42 5 -19 56 2 -18 5 58 135 0 0 -19 24 44 12 2 47 39 302 -49 -19 43 35 -19 5 55 -20 19 48 -18 29 51 136 0 0 -19 48 20 12 2 52 38 301 -50 -20 7 9 -19 29 33 -20 43 21 -18 53 31 137 0 0 -20 11 42 12 2 57 37 301 -51 -20 30 30 -19 52 56 -21 6 39 -19 16 57 138 0 0 -20 34 50 12 3 2 36 300 -52 -20 53 36 -20 16 5 -21 29 42 -19 40 8 139 0 0 -20 57 42 12 3 6 35 300 -53 -21 16 27 -20 38 58 -21 52 30 -20 3 4 140 0 0 -21 20 19 12 3 11 34 299 -54 -21 39 2 -21 1 37 -22 15 3 -20 25 45 141 0 0 -21 42 40 12 3 15 33 299 -55 -22 1 22 -21 23 59 -22 37 20 -20 48 11 142 0 0 -22 4 45 12 3 19 32 298 -56 -22 23 25 -21 46 6 -22 59 20 -21 10 20 143 0 0 -22 26 33 12 3 23 31 298 -57 -22 45 12 -22 7 56 -23 21 4 -21 32 13 144 0 0 -22 48 5 12 3 27 30 297 -58 -23 6 42 -22 29 29 -23 42 31 -21 53 49 145 0 0 -23 9 19 12 3 31 29 297 -59 -23 27 55 -22 50 44 -24 3 40 -22 15 8 146 0 0 -23 30 16 12 3 34 28 296 -60 -23 48 50 -23 11 43 -24 24 32 -22 36 9 147 0 0 -23 50 54 12 3 38 27 296 -61 -24 9 27 -23 32 23 -24 45 6 -22 56 53 148 0 0 -24 11 15 12 3 41 26 295 -62 -24 29 46 -23 52 45 -25 5 22 -23 17 18 149 0 0 -24 31 17 12 3 45 25 295 -63 -24 49 46 -24 12 49 -25 25 19 -23 37 25 150 0 0 -24 51 1 12 3 48 24 295 -64 -25 9 28 -24 32 35 -25 44 58 -23 57 14 151 0 0 -25 10 26 12 3 51 23 294 -64 -25 28 51 -24 52 1 -26 4 17 -24 16 44 152 0 0 -25 29 31 12 3 54 23 294 -65 -25 47 55 -25 11 9 -26 23 18 -24 35 55 153 0 0 -25 48 18 12 3 56 22 293 -66 -26 6 40 -25 29 57 -26 41 59 -24 54 46 154 0 0 -26 6 45 12 3 59 21 293 -67 -26 25 5 -25 48 26 -27 0 21 -25 13 18 155 0 0 -26 24 52 12 4 2 20 292 -68 -26 43 11 -26 6 35 -27 18 23 -25 31 30 156 0 0 -26 42 40 12 4 4 19 292 -69 -27 0 57 -26 24 24 -27 36 6 -25 49 23 157 0 0 -27 0 7 12 4 6 18 291 -70 -27 18 22 -26 41 53 -27 53 28 -26 6 56 158 0 0 -27 17 15 12 4 8 17 291 -71 -27 35 28 -26 59 2 -28 10 31 -26 24 8 159 0 0 -27 34 2 12 4 10 16 290 -71 -27 52 13 -27 15 51 -28 27 13 -26 41 0 160 0 0 -27 50 29 12 4 12 15 290 -72 -28 8 39 -27 32 20 -28 43 34 -26 57 32 161 0 0 -28 6 35 12 4 14 14 289 -73 -28 24 43 -27 48 28 -28 59 36 -27 13 44 162 0 0 -28 22 21 12 4 16 13 289 -74 -28 40 27 -28 4 16 -29 15 17 -27 29 34 163 0 0 -28 37 46 12 4 17 12 288 -75 -28 55 51 -28 19 42 -29 30 37 -27 45 5 164 0 0 -28 52 51 12 4 19 11 288 -75 -29 10 54 -28 34 49 -29 45 37 -28 0 14 165 0 0 -29 7 34 12 4 20 10 287 -76 -29 25 36 -28 49 34 -30 0 15 -28 15 3 166 0 0 -29 21 57 12 4 21 9 287 -77 -29 39 57 -29 3 59 -30 14 34 -28 29 30 167 0 0 -29 35 59 12 4 22 9 286 -77 -29 53 58 -29 18 2 -30 28 31 -28 43 37 168 0 0 -29 49 40 12 4 23 8 286 -78 -30 7 37 -29 31 45 -30 42 7 -28 57 23 169 0 0 -30 3 1 12 4 24 7 285 -79 -30 20 56 -29 45 7 -30 55 23 -29 10 48 170 0 0 -30 16 0 12 4 25 6 285 -79 -30 33 53 -29 58 7 -31 8 17 -29 23 51 171 0 0 -30 28 38 12 4 25 5 284 -80 -30 46 30 -30 10 47 -31 20 51 -29 36 34 172 0 0 -30 40 55 12 4 26 4 284 -80 -30 58 45 -30 23 6 -31 33 4 -29 48 55 173 0 0 -30 52 51 12 4 26 3 283 -80 -31 10 40 -30 35 3 -31 44 56 -30 0 56 174 0 0 -31 4 26 12 4 27 2 283 -81 -31 22 14 -30 46 40 -31 56 26 -30 12 35 175 0 0 -31 15 40 12 4 27 1 282 -81 -31 33 26 -30 57 55 -32 7 36 -30 23 53 176 0 0 -31 26 33 12 4 27 1 282 -81 -31 44 18 -31 8 49 -32 18 25 -30 34 50 Uncertainty in time = +/- 5 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 0855-00895-1 * constellation : Leo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 11 22 44.4174 DE: +09 52 33.921 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .022 ) * V mag [mag]: 10.4 * B mag [mag]: 10.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (903) Nealley approx. diameter [km]: 63 approx. diameter ["]: .027 distance from Earth [AU]: 3.19000 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 897 number of rejected observations: 43 time covered by the observations: 1918 Sep 13 - 2008 Jan 31 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.013, 99° remarks: * orbital elements for (903) Nealley : Mean anomaly = 145.51262126 deg Arg. of pericenter = 238.16234237 deg Long. of node = 159.67510467 deg Inclination = 11.75223831 deg Eccentricity = 0.03880239 Semimajor axis = 3.24049208 AU Perihelion dist = 3.11475324 AU Mag: H = 10.03, G = 0.15 Epoch of elements : MJD 54990.49800000 TDT (2009 Jun 08.498) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jun 8 903 Nealley 11h 57.4m UT 10.4 11 22 44.417 9 52 33.92TYC 0855-00895-1 10.8 15.9 63 4.3 3.190 1.466 -8.22 94.3201 9.878 0.41 22.88 11.9575 -0.06853 -0.18029 7.85754 -2.98050 0.00520 -0.00223 2000 145.4284782009 6 8.00000238.162342159.675105 11.7522380.03880239 3.2404921 3.1147532 9.8 5.00.15 RATE 1.6896150 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.026 94 1.96 0.026 0 54545.5020090608_0895-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 09:10 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org