IOTA/IOTA-ES occultation update for (1604) Tombaugh / HIP 10042 event on 2008 Jan 11, 08:24 UT Visible from S Pacific Islands Summary ------- On 2008 Jan 11 UT, the 32 km diameter asteroid (1604) Tombaugh will occult a 8.9 mag star in the constellation Aries for observers along a path across S Pacific Islands. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.8 mag to 15.7 mag (the magnitude of the asteroid) for at most 3.4 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: . The event at a glimpse ---------------------- * Rank: 40 * date and approx. time of event: 2008 Jan 11, 08:15 - 2008 Jan 11, 08:32 UT * magnitude of target star: 8.9 * magnitude drop [mag]: 6.8 * estimated maximum duration [s]: 3.4 * Moon: 9 % sunlit, 74° distance * Sun: 108° distance * rough path description: S Pacific Islands The occultation path -------------------- * approximate projected width [km]: 41 * 1 sigma uncertainty interval [path widths]: +/- 1.66 * 1 sigma uncertainty interval [seconds]: +/- 6.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .029", 78° ) * approx speed of asteroid's shadow [km/s]: 9.3916 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of HIP 10042 by 1604 Tombaugh on 2008 Jan 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 80 0 0 -23 26 6 8 15 23 0 63 70 -23 38 30 -23 13 45 .. .. .. .. .. .. 81 0 0 -22 58 34 8 15 23 1 63 69 -23 10 55 -22 46 15 -23 52 14 .. .. .. 82 0 0 -22 31 27 8 15 23 2 62 68 -22 43 46 -22 19 11 -23 24 55 .. .. .. 83 0 0 -22 4 46 8 15 24 3 62 67 -22 17 2 -21 52 32 -22 58 3 .. .. .. 84 0 0 -21 38 32 8 15 25 4 62 66 -21 50 45 -21 26 20 -22 31 38 .. .. .. 85 0 0 -21 12 45 8 15 27 5 61 65 -21 24 56 -21 0 36 -22 5 39 -20 20 32 86 0 0 -20 47 25 8 15 28 6 61 64 -20 59 34 -20 35 19 -21 40 10 -19 55 23 87 0 0 -20 22 35 8 15 30 8 61 63 -20 34 41 -20 10 31 -21 15 8 -19 30 43 88 0 0 -19 58 14 8 15 32 9 60 62 -20 10 18 -19 46 12 -20 50 37 -19 6 32 89 0 0 -19 34 22 8 15 35 10 60 61 -19 46 24 -19 22 23 -20 26 35 -18 42 51 90 0 0 -19 11 2 8 15 38 11 59 60 -19 23 1 -18 59 5 -20 3 4 -18 19 40 91 0 0 -18 48 12 8 15 41 12 59 59 -19 0 8 -18 36 17 -19 40 4 -17 56 59 92 0 0 -18 25 53 8 15 44 13 59 58 -18 37 48 -18 14 1 -19 17 35 -17 34 51 93 0 0 -18 4 7 8 15 47 14 58 57 -18 15 59 -17 52 17 -18 55 39 -17 13 14 94 0 0 -17 42 53 8 15 51 15 58 56 -17 54 43 -17 31 5 -18 34 16 -16 52 9 95 0 0 -17 22 12 8 15 55 16 58 55 -17 34 1 -17 10 27 -18 13 26 -16 31 37 96 0 0 -17 2 5 8 16 0 17 57 54 -17 13 51 -16 50 21 -17 53 10 -16 11 39 97 0 0 -16 42 32 8 16 4 18 57 53 -16 54 16 -16 30 50 -17 33 28 -15 52 14 98 0 0 -16 23 33 8 16 9 19 57 52 -16 35 15 -16 11 53 -17 14 20 -15 33 23 99 0 0 -16 5 8 8 16 14 20 56 51 -16 16 48 -15 53 30 -16 55 47 -15 15 7 100 0 0 -15 47 19 8 16 20 21 56 50 -15 58 57 -15 35 43 -16 37 50 -14 57 25 101 0 0 -15 30 5 8 16 25 22 55 49 -15 41 42 -15 18 31 -16 20 28 -14 40 19 102 0 0 -15 13 27 8 16 31 23 55 48 -15 25 2 -15 1 54 -16 3 42 -14 23 48 103 0 0 -14 57 25 8 16 37 23 55 47 -15 8 58 -14 45 54 -15 47 33 -14 7 53 104 0 0 -14 41 59 8 16 44 24 54 46 -14 53 31 -14 30 30 -15 32 0 -13 52 34 105 0 0 -14 27 11 8 16 50 25 54 45 -14 38 40 -14 15 43 -15 17 5 -13 37 52 106 0 0 -14 12 59 8 16 57 26 53 44 -14 24 27 -14 1 32 -15 2 46 -13 23 46 107 0 0 -13 59 24 8 17 4 27 53 43 -14 10 51 -13 47 59 -14 49 5 -13 10 18 108 0 0 -13 46 27 8 17 12 28 52 42 -13 57 52 -13 35 3 -14 36 2 -12 57 26 109 0 0 -13 34 7 8 17 19 29 52 41 -13 45 31 -13 22 45 -14 23 37 -12 45 12 110 0 0 -13 22 26 8 17 27 30 51 40 -13 33 49 -13 11 4 -14 11 50 -12 33 36 111 0 0 -13 11 22 8 17 35 31 51 38 -13 22 44 -13 0 2 -14 0 42 -12 22 37 112 0 0 -13 0 57 8 17 43 32 50 37 -13 12 18 -12 49 38 -13 50 12 -12 12 17 113 0 0 -12 51 11 8 17 51 33 50 36 -13 2 31 -12 39 53 -13 40 21 -12 2 35 114 0 0 -12 42 3 8 18 0 34 49 35 -12 53 22 -12 30 46 -13 31 9 -11 53 31 115 0 0 -12 33 34 8 18 8 34 48 34 -12 44 52 -12 22 18 -13 22 37 -11 45 6 116 0 0 -12 25 45 8 18 17 35 48 33 -12 37 2 -12 14 29 -13 14 44 -11 37 19 117 0 0 -12 18 34 8 18 27 36 47 32 -12 29 51 -12 7 19 -13 7 30 -11 30 12 118 0 0 -12 12 3 8 18 36 37 47 31 -12 23 19 -12 0 49 -13 0 56 -11 23 44 119 0 0 -12 6 11 8 18 45 38 46 30 -12 17 27 -11 54 58 -12 55 2 -11 17 54 120 0 0 -12 1 0 8 18 55 38 45 29 -12 12 14 -11 49 46 -12 49 48 -11 12 45 121 0 0 -11 56 27 8 19 5 39 44 28 -12 7 42 -11 45 15 -12 45 14 -11 8 14 122 0 0 -11 52 35 8 19 15 40 44 27 -12 3 49 -11 41 23 -12 41 20 -11 4 23 123 0 0 -11 49 23 8 19 25 41 43 27 -12 0 36 -11 38 11 -12 38 7 -11 1 12 124 0 0 -11 46 50 8 19 35 41 42 26 -11 58 4 -11 35 39 -12 35 34 -10 58 41 125 0 0 -11 44 58 8 19 45 42 41 25 -11 56 12 -11 33 47 -12 33 41 -10 56 49 126 0 0 -11 43 46 8 19 56 43 40 24 -11 55 0 -11 32 35 -12 32 29 -10 55 37 127 0 0 -11 43 15 8 20 7 43 39 23 -11 54 28 -11 32 3 -12 31 58 -10 55 5 128 0 0 -11 43 24 8 20 18 44 38 22 -11 54 37 -11 32 12 -12 32 7 -10 55 14 129 0 0 -11 44 13 8 20 29 45 37 21 -11 55 27 -11 33 1 -12 32 57 -10 56 2 130 0 0 -11 45 43 8 20 40 45 36 20 -11 56 57 -11 34 30 -12 34 28 -10 57 31 131 0 0 -11 47 53 8 20 51 46 35 19 -11 59 8 -11 36 40 -12 36 40 -10 59 40 132 0 0 -11 50 44 8 21 2 46 34 18 -12 1 59 -11 39 31 -12 39 33 -11 2 29 133 0 0 -11 54 16 8 21 14 47 33 17 -12 5 31 -11 43 2 -12 43 7 -11 5 58 134 0 0 -11 58 28 8 21 25 47 32 16 -12 9 44 -11 47 14 -12 47 22 -11 10 8 135 0 0 -12 3 21 8 21 37 48 30 15 -12 14 37 -11 52 6 -12 52 17 -11 14 58 136 0 0 -12 8 54 8 21 49 48 29 14 -12 20 12 -11 57 39 -12 57 54 -11 20 28 137 0 0 -12 15 9 8 22 0 49 28 13 -12 26 27 -12 3 52 -13 4 12 -11 26 39 138 0 0 -12 22 3 8 22 12 49 26 12 -12 33 23 -12 10 46 -13 11 11 -11 33 30 139 0 0 -12 29 39 8 22 24 49 25 11 -12 40 59 -12 18 21 -13 18 51 -11 41 1 140 0 0 -12 37 55 8 22 36 50 24 10 -12 49 16 -12 26 36 -13 27 12 -11 49 13 141 0 0 -12 46 52 8 22 48 50 22 9 -12 58 14 -12 35 31 -13 36 14 -11 58 5 142 0 0 -12 56 29 8 23 1 50 21 9 -13 7 53 -12 45 8 -13 45 56 -12 7 37 143 0 0 -13 6 47 8 23 13 50 19 8 -13 18 12 -12 55 24 -13 56 20 -12 17 49 144 0 0 -13 17 45 8 23 25 51 18 7 -13 29 11 -13 6 21 -14 7 24 -12 28 42 145 0 0 -13 29 24 8 23 37 51 16 6 -13 40 51 -13 17 58 -14 19 8 -12 40 14 146 0 0 -13 41 42 8 23 50 51 15 5 -13 53 11 -13 30 15 -14 31 34 -12 52 26 147 0 0 -13 54 41 8 24 2 51 13 4 -14 6 12 -13 43 12 -14 44 39 -13 5 18 148 0 0 -14 8 20 8 24 14 51 12 3 -14 19 52 -13 56 49 -14 58 25 -13 18 50 149 0 0 -14 22 38 8 24 27 51 10 2 -14 34 12 -14 11 6 -15 12 51 -13 33 1 150 0 0 -14 37 36 8 24 39 51 9 2 -14 49 12 -14 26 2 -15 27 57 -13 47 52 151 0 0 -14 53 14 8 24 52 51 7 1 -15 4 51 -14 41 38 -15 43 43 -14 3 21 152 0 0 -15 9 30 8 25 4 50 6 0 -15 21 10 -14 57 52 -16 0 8 -14 19 30 153 0 0 -15 26 26 8 25 16 50 4 -1 -15 38 8 -15 14 46 -16 17 12 -14 36 17 154 0 0 -15 44 0 8 25 29 50 3 -2 -15 55 44 -15 32 18 -16 34 56 -14 53 42 155 0 0 -16 2 13 8 25 41 50 1 -3 -16 13 59 -15 50 29 -16 53 18 -15 11 46 156 0 0 -16 21 4 8 25 53 49 360 -3 -16 32 52 -16 9 18 -17 12 19 -15 30 28 157 0 0 -16 40 33 8 26 6 49 358 -4 -16 52 24 -16 28 45 -17 31 58 -15 49 47 158 0 0 -17 0 39 8 26 18 49 357 -5 -17 12 32 -16 48 49 -17 52 14 -16 9 44 159 0 0 -17 21 23 8 26 30 48 355 -6 -17 33 18 -17 9 30 -18 13 8 -16 30 18 160 0 0 -17 42 43 8 26 42 48 354 -6 -17 54 41 -17 30 48 -18 34 39 -16 51 28 161 0 0 -18 4 40 8 26 54 47 353 -7 -18 16 40 -17 52 42 -18 56 46 -17 13 14 162 0 0 -18 27 12 8 27 6 47 351 -8 -18 39 15 -18 15 12 -19 19 30 -17 35 36 163 0 0 -18 50 20 8 27 18 46 350 -9 -19 2 25 -18 38 17 -19 42 49 -17 58 32 164 0 0 -19 14 3 8 27 30 46 349 -9 -19 26 10 -19 1 57 -20 6 43 -18 22 4 165 0 0 -19 38 19 8 27 41 45 347 -10 -19 50 30 -19 26 11 -20 31 11 -18 46 10 166 0 0 -20 3 10 8 27 53 44 346 -11 -20 15 23 -19 50 59 -20 56 14 -19 10 49 167 0 0 -20 28 34 8 28 4 44 345 -11 -20 40 50 -20 16 20 -21 21 49 -19 36 1 168 0 0 -20 54 30 8 28 16 43 344 -12 -21 6 48 -20 42 14 -21 47 57 -20 1 46 169 0 0 -21 20 58 8 28 27 42 343 -13 -21 33 19 -21 8 39 -22 14 37 -20 28 2 170 0 0 -21 47 57 8 28 38 42 342 -13 -22 0 21 -21 35 35 -22 41 49 -20 54 49 171 0 0 -22 15 26 8 28 48 41 341 -14 -22 27 53 -22 3 1 -23 9 30 -21 22 6 172 0 0 -22 43 25 8 28 59 40 340 -14 -22 55 54 -22 30 57 -23 37 42 -21 49 53 173 0 0 -23 11 52 8 29 10 39 338 -15 -23 24 25 -22 59 22 -24 6 22 -22 18 8 174 0 0 -23 40 47 8 29 20 39 338 -16 -23 53 23 -23 28 14 -24 35 29 -22 46 51 175 0 0 -24 10 9 8 29 30 38 337 -16 -24 22 48 -23 57 34 -25 5 4 -23 16 1 176 0 0 -24 39 58 8 29 40 37 336 -17 -24 52 39 -24 27 19 -25 35 5 -23 45 38 177 0 0 -25 10 11 8 29 50 36 335 -17 -25 22 55 -24 57 29 -26 5 31 -24 15 39 178 0 0 -25 40 48 8 29 59 35 334 -18 -25 53 35 -25 28 4 -26 36 21 -24 46 4 179 0 0 -26 11 48 8 30 9 34 333 -18 -26 24 38 -25 59 1 -27 7 34 -25 16 52 180 0 0 -26 43 10 8 30 18 33 332 -18 -26 56 3 -26 30 20 -27 39 8 -25 48 2 -179 0 0 -27 14 54 8 30 26 33 331 -19 -27 27 49 -27 2 1 -28 11 4 -26 19 33 -178 0 0 -27 46 56 8 30 35 32 330 -19 -27 59 55 -27 34 1 -28 43 19 -26 51 25 -177 0 0 -28 19 18 8 30 43 31 330 -20 -28 32 19 -28 6 19 -29 15 53 -27 23 34 -176 0 0 -28 51 57 8 30 52 30 329 -20 -29 5 1 -28 38 56 -29 48 44 -27 56 2 -175 0 0 -29 24 52 8 31 0 29 328 -20 -29 37 59 -29 11 48 -30 21 51 -28 28 45 -174 0 0 -29 58 2 8 31 7 28 327 -21 -30 11 11 -29 44 56 -30 55 12 -29 1 44 -173 0 0 -30 31 26 8 31 15 27 327 -21 -30 44 38 -30 18 17 -31 28 48 -29 34 57 -172 0 0 -31 5 2 8 31 22 26 326 -21 -31 18 17 -30 51 51 -32 2 36 -30 8 23 -171 0 0 -31 38 50 8 31 29 25 325 -21 -31 52 7 -31 25 36 -32 36 34 -30 42 0 -170 0 0 -32 12 48 8 31 35 24 324 -22 -32 26 7 -31 59 31 -33 10 43 -31 15 48 -169 0 0 -32 46 54 8 31 41 23 324 -22 -33 0 16 -32 33 35 -33 44 59 -31 49 44 -168 0 0 -33 21 8 8 31 48 22 323 -22 -33 34 32 -33 7 47 -34 19 23 -32 23 48 -167 0 0 -33 55 27 8 31 53 21 322 -22 -34 8 53 -33 42 4 -34 53 52 -32 57 58 -166 0 0 -34 29 51 8 31 59 20 322 -22 -34 43 20 -34 16 26 -35 28 26 -33 32 14 -165 0 0 -35 4 19 8 32 4 19 321 -22 -35 17 50 -34 50 52 -36 3 3 -34 6 33 -164 0 0 -35 38 49 8 32 9 18 320 -22 -35 52 21 -35 25 20 -36 37 41 -34 40 54 -163 0 0 -36 13 19 8 32 14 17 319 -22 -36 26 54 -35 59 48 -37 12 20 -35 15 17 -162 0 0 -36 47 49 8 32 18 16 319 -22 -37 1 25 -36 34 16 -37 46 58 -35 49 39 -161 0 0 -37 22 17 8 32 22 15 318 -22 -37 35 55 -37 8 42 -38 21 33 -36 24 0 -160 0 0 -37 56 42 8 32 26 14 317 -22 -38 10 21 -37 43 6 -38 56 5 -36 58 18 -159 0 0 -38 31 2 8 32 30 13 317 -22 -38 44 43 -38 17 25 -39 30 32 -37 32 33 -158 0 0 -39 5 17 8 32 33 12 316 -22 -39 18 59 -38 51 38 -40 4 52 -38 6 42 -157 0 0 -39 39 24 8 32 36 12 315 -22 -39 53 8 -39 25 44 -40 39 5 -38 40 44 -156 0 0 -40 13 24 8 32 39 11 315 -22 -40 27 8 -39 59 43 -41 13 10 -39 14 39 -155 0 0 -40 47 14 8 32 41 10 314 -22 -41 1 0 -40 33 32 -41 47 5 -39 48 25 -154 0 0 -41 20 54 8 32 44 9 313 -22 -41 34 40 -41 7 11 -42 20 48 -40 22 1 -153 0 0 -41 54 22 8 32 46 8 313 -22 -42 8 9 -41 40 38 -42 54 20 -40 55 26 -152 0 0 -42 27 37 8 32 47 7 312 -22 -42 41 25 -42 13 53 -43 27 38 -41 28 39 -151 0 0 -43 0 39 8 32 49 6 311 -21 -43 14 27 -42 46 54 -44 0 42 -42 1 38 -150 0 0 -43 33 26 8 32 50 5 311 -21 -43 47 14 -43 19 40 -44 33 30 -42 34 24 -149 0 0 -44 5 57 8 32 51 4 310 -21 -44 19 46 -43 52 11 -45 6 3 .. .. .. -148 0 0 -44 38 11 8 32 52 3 309 -21 -44 52 0 -44 24 26 -45 38 17 .. .. .. -147 0 0 -45 10 8 8 32 53 2 309 -20 -45 23 57 -44 56 22 -46 10 14 .. .. .. -146 0 0 -45 41 46 8 32 53 1 308 -20 -45 55 35 -45 28 1 -46 41 52 .. .. .. -145 0 0 -46 13 5 8 32 53 1 307 -20 -46 26 54 -45 59 20 .. .. .. .. .. .. Data for the target star ------------------------ * name: HIP 10042 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 09 16.3947 DE: +24 18 07.364 * position source: mpos:HIP pm:HIP plx:HIP * standard error: RA,DE ["]: ( .025, .021 ) * V mag [mag]: 8.9 * B mag [mag]: 10.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1604) Tombaugh approx. diameter [km]: 32 approx. diameter ["]: .018 distance from Earth [AU]: 2.45500 * orbital information: orbit source: Preston date of fit: 2008 Jan 02 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 856 number of rejected observations: 45 time covered by the observations: 1920 Mar 10 - 2007 Dec 16 1 sigma uncertainty ellipse (major, minor, PA): 0.026, 0.020, 68° remarks: * orbital elements for (1604) Tombaugh : Mean anomaly = 61.50219732 deg Arg. of pericenter = 36.18547796 deg Long. of node = 309.25535721 deg Inclination = 9.37927584 deg Eccentricity = 0.09624374 Semimajor axis = 3.02599637 AU Perihelion dist = 2.73476316 AU Mag: H = 10.35, G = 0.15 Epoch of elements : MJD 54476.35000000 TDT (2008 Jan 11.350) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jan 11 1604 Tombaugh 8h 24.1m UT 8.9 2 9 16.395 24 18 7.36HIP 10042 10.0 15.7 32 3.4 2.455 1.352 -4.37 -203.946 24.303 55.89 -21.88 8.4022 -.14674 -.61466 5.15825 -1.22149 0.00550 0.00164 2000 60.31321512008 1 5.00000 36.185478309.255357 9.3792760.096243743.025996372.7347631610.55 0.15 RATE 1.8724122 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.036 0.029 78.4 2.660 0.030 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 02, 23:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org