IOTA/IOTA-ES occultation update for (15) Eunomia / UCAC2 39471892 event on 2008 Feb 04, 15:10 UT Visible from Australia Summary ------- On 2008 Feb 04 UT, the 255 km diameter asteroid (15) Eunomia will occult a 11.5 mag star in the constellation Gemini for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.1 mag to 8.9 mag (the magnitude of the asteroid) for at most 31.4 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: 100 * date and approx. time of event: 2008 Feb 04, 15:03 - 2008 Feb 04, 15:16 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 0.1 * estimated maximum duration [s]: 31.4 * Moon: 6 % sunlit, 176° distance * Sun: 149° distance * rough path description: Australia Additional comments ------------------- very small mag drop The occultation path -------------------- * approximate projected width [km]: 498 * 1 sigma uncertainty interval [path widths]: +/- 0.10 * 1 sigma uncertainty interval [seconds]: +/- 3.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .025 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .025", .021", 97° ) * approx speed of asteroid's shadow [km/s]: 8.1218 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 39471892 by 15 Eunomia on 2008 Feb 04 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 ' " Longitude Longitude Longitude Longitude ... .. .. -67 0 0 .. .. .. .. .. .. ... .. .. 82 57 26 ... .. .. 84 17 32 77 31 47 -66 0 0 15 16 57 0 23 2 ... .. .. 83 48 8 ... .. .. 85 5 42 78 35 13 -65 0 0 15 16 56 1 22 1 ... .. .. 84 40 24 ... .. .. 85 55 41 79 39 6 -64 0 0 15 16 56 3 21 0 ... .. .. 85 34 13 ... .. .. 86 47 27 80 43 31 -63 0 0 15 16 54 4 20 -1 ... .. .. 86 29 33 ... .. .. 87 40 57 81 48 31 -62 0 0 15 16 52 5 19 -2 ... .. .. 87 26 23 ... .. .. 88 36 8 82 54 13 -61 0 0 15 16 49 6 18 -3 ... .. .. 88 24 44 ... .. .. 89 33 0 84 0 41 -60 0 0 15 16 46 7 17 -4 78 51 10 89 24 37 ... .. .. 90 31 34 85 7 59 -59 0 0 15 16 42 8 16 -5 80 4 27 90 26 3 ... .. .. 91 31 50 86 16 13 -58 0 0 15 16 37 9 15 -6 81 18 3 91 29 4 80 19 50 92 33 50 87 25 28 -57 0 0 15 16 32 10 14 -7 82 32 4 92 33 45 81 34 50 93 37 36 88 35 49 -56 0 0 15 16 26 11 13 -8 83 46 38 93 40 7 82 50 16 94 43 13 89 47 21 -55 0 0 15 16 19 13 12 -9 85 1 52 94 48 16 84 6 16 95 50 44 91 0 11 -54 0 0 15 16 12 14 11 -11 86 17 52 95 58 17 85 22 57 97 0 14 92 14 25 -53 0 0 15 16 4 15 10 -12 87 34 47 97 10 16 86 40 27 98 11 50 93 30 10 -52 0 0 15 15 55 16 9 -13 88 52 43 98 24 19 87 58 52 99 25 37 94 47 34 -51 0 0 15 15 45 17 8 -14 90 11 49 99 40 35 89 18 21 100 41 45 96 6 44 -50 0 0 15 15 35 18 6 -16 91 32 11 100 59 14 90 39 2 102 0 23 97 27 50 -49 0 0 15 15 23 19 5 -17 92 54 0 102 20 25 92 1 3 103 21 43 98 51 3 -48 0 0 15 15 11 20 4 -18 94 17 23 103 44 21 93 24 33 104 45 57 100 16 33 -47 0 0 15 14 58 21 2 -20 95 42 32 105 11 17 94 49 43 106 13 21 101 44 35 -46 0 0 15 14 44 22 1 -21 97 9 36 106 41 30 96 16 43 107 44 13 103 15 22 -45 0 0 15 14 30 23 360 -22 98 38 49 108 15 21 97 45 45 109 18 55 104 49 13 -44 0 0 15 14 14 24 358 -24 100 10 24 109 53 13 99 17 1 110 57 55 106 26 28 -43 0 0 15 13 57 25 356 -25 101 44 36 111 35 38 100 50 47 112 41 44 108 7 31 -42 0 0 15 13 39 26 355 -27 103 21 43 113 23 11 102 27 20 114 31 3 109 52 50 -41 0 0 15 13 19 27 353 -28 105 2 7 115 16 38 104 6 59 116 26 45 111 43 3 -40 0 0 15 12 59 28 351 -30 106 46 10 117 17 1 105 50 7 118 29 58 113 38 52 -39 0 0 15 12 37 29 349 -31 108 34 22 119 25 38 107 37 10 120 42 12 115 41 15 -38 0 0 15 12 13 29 347 -33 110 27 19 121 44 18 109 28 42 123 5 38 Latitude Latitude Latitude Latitude 116 0 0 -37 51 7 15 12 9 29 347 -33 -35 19 2 -40 37 57 -34 50 3 -41 13 34 117 0 0 -37 23 14 15 11 58 30 346 -34 -34 52 31 -40 8 15 -34 23 46 -40 43 25 118 0 0 -36 56 11 15 11 46 30 344 -34 -34 26 47 -39 39 29 -33 58 16 -40 14 14 119 0 0 -36 29 58 15 11 34 30 343 -35 -34 1 49 -39 11 37 -33 33 31 -39 45 58 120 0 0 -36 4 35 15 11 22 30 342 -36 -33 37 38 -38 44 41 -33 9 32 -39 18 39 121 0 0 -35 40 1 15 11 11 30 341 -36 -33 14 13 -38 18 39 -32 46 19 -38 52 16 122 0 0 -35 16 18 15 10 59 30 340 -37 -32 51 35 -37 53 31 -32 23 52 -38 26 48 123 0 0 -34 53 24 15 10 47 31 339 -38 -32 29 43 -37 29 17 -32 2 11 -38 2 16 124 0 0 -34 31 19 15 10 35 31 338 -38 -32 8 37 -37 5 57 -31 41 16 -37 38 37 125 0 0 -34 10 4 15 10 23 31 337 -39 -31 48 19 -36 43 30 -31 21 7 -37 15 54 126 0 0 -33 49 38 15 10 11 31 336 -39 -31 28 46 -36 21 56 -31 1 44 -36 54 4 127 0 0 -33 30 2 15 10 0 31 335 -40 -31 10 0 -36 1 16 -30 43 7 -36 33 9 128 0 0 -33 11 15 15 9 48 31 334 -40 -30 52 1 -35 41 28 -30 25 16 -36 13 7 129 0 0 -32 53 17 15 9 36 30 333 -40 -30 34 48 -35 22 33 -30 8 12 -35 53 58 130 0 0 -32 36 8 15 9 25 30 332 -41 -30 18 22 -35 4 30 -29 51 53 -35 35 43 131 0 0 -32 19 48 15 9 13 30 331 -41 -30 2 42 -34 47 20 -29 36 20 -35 18 21 132 0 0 -32 4 17 15 9 2 30 330 -42 -29 47 49 -34 31 2 -29 21 33 -35 1 52 133 0 0 -31 49 35 15 8 51 30 329 -42 -29 33 42 -34 15 36 -29 7 33 -34 46 15 134 0 0 -31 35 41 15 8 39 30 328 -42 -29 20 22 -34 1 1 -28 54 19 -34 31 32 135 0 0 -31 22 37 15 8 28 29 327 -42 -29 7 48 -33 47 19 -28 41 50 -34 17 40 136 0 0 -31 10 21 15 8 17 29 326 -43 -28 56 1 -33 34 28 -28 30 8 -34 4 41 137 0 0 -30 58 55 15 8 6 29 325 -43 -28 45 0 -33 22 29 -28 19 12 -33 52 35 138 0 0 -30 48 17 15 7 55 28 324 -43 -28 34 46 -33 11 21 -28 9 2 -33 41 20 139 0 0 -30 38 27 15 7 45 28 323 -43 -28 25 18 -33 1 5 -27 59 39 -33 30 58 140 0 0 -30 29 27 15 7 34 28 323 -43 -28 16 38 -32 51 41 -27 51 1 -33 21 28 141 0 0 -30 21 15 15 7 24 27 322 -43 -28 8 43 -32 43 8 -27 43 10 -33 12 50 142 0 0 -30 13 53 15 7 14 27 321 -43 -28 1 36 -32 35 26 -27 36 5 -33 5 4 143 0 0 -30 7 19 15 7 4 26 320 -43 -27 55 15 -32 28 36 -27 29 47 -32 58 10 144 0 0 -30 1 34 15 6 54 26 319 -43 -27 49 42 -32 22 37 -27 24 15 -32 52 8 145 0 0 -29 56 38 15 6 44 26 318 -43 -27 44 55 -32 17 30 -27 19 30 -32 46 59 146 0 0 -29 52 31 15 6 34 25 318 -43 -27 40 55 -32 13 15 -27 15 32 -32 42 42 147 0 0 -29 49 14 15 6 25 24 317 -43 -27 37 42 -32 9 51 -27 12 20 -32 39 16 148 0 0 -29 46 46 15 6 16 24 316 -43 -27 35 17 -32 7 19 -27 9 55 -32 36 44 149 0 0 -29 45 7 15 6 7 23 315 -43 -27 33 39 -32 5 39 -27 8 17 -32 35 3 150 0 0 -29 44 17 15 5 58 23 315 -42 -27 32 48 -32 4 51 -27 7 26 -32 34 16 151 0 0 -29 44 17 15 5 49 22 314 -42 -27 32 45 -32 4 55 -27 7 22 -32 34 21 152 0 0 -29 45 7 15 5 41 22 313 -42 -27 33 29 -32 5 52 -27 8 5 -32 35 18 153 0 0 -29 46 46 15 5 33 21 312 -42 -27 35 1 -32 7 40 -27 9 36 -32 37 9 154 0 0 -29 49 16 15 5 25 20 312 -41 -27 37 21 -32 10 22 -27 11 54 -32 39 53 155 0 0 -29 52 36 15 5 17 20 311 -41 -27 40 29 -32 13 56 -27 15 0 -32 43 31 156 0 0 -29 56 46 15 5 10 19 310 -40 -27 44 26 -32 18 23 -27 18 54 -32 48 2 157 0 0 -30 1 47 15 5 2 18 310 -40 -27 49 10 -32 23 44 -27 23 36 -32 53 27 158 0 0 -30 7 39 15 4 55 18 309 -40 -27 54 44 -32 29 58 -27 29 6 -32 59 46 159 0 0 -30 14 21 15 4 49 17 309 -39 -28 1 6 -32 37 5 -27 35 25 -33 6 59 160 0 0 -30 21 55 15 4 42 16 308 -39 -28 8 17 -32 45 7 -27 42 32 -33 15 7 161 0 0 -30 30 20 15 4 36 15 307 -38 -28 16 17 -32 54 3 -27 50 28 -33 24 10 162 0 0 -30 39 37 15 4 30 15 307 -38 -28 25 7 -33 3 54 -27 59 12 -33 34 9 163 0 0 -30 49 46 15 4 24 14 306 -37 -28 34 46 -33 14 39 -28 8 46 -33 45 3 164 0 0 -31 0 47 15 4 19 13 306 -36 -28 45 15 -33 26 20 -28 19 9 -33 56 53 165 0 0 -31 12 41 15 4 14 12 305 -36 -28 56 34 -33 38 57 -28 30 22 -34 9 39 166 0 0 -31 25 27 15 4 9 11 304 -35 -29 8 43 -33 52 29 -28 42 25 -34 23 22 167 0 0 -31 39 7 15 4 5 11 304 -34 -29 21 43 -34 6 58 -28 55 17 -34 38 2 168 0 0 -31 53 40 15 4 1 10 303 -34 -29 35 33 -34 22 23 -29 9 0 -34 53 40 169 0 0 -32 9 6 15 3 57 9 303 -33 -29 50 15 -34 38 46 -29 23 34 -35 10 16 170 0 0 -32 25 27 15 3 54 8 302 -32 -30 5 47 -34 56 7 -29 38 58 -35 27 51 171 0 0 -32 42 42 15 3 51 7 302 -32 -30 22 12 -35 14 25 -29 55 13 -35 46 24 172 0 0 -33 0 51 15 3 48 6 301 -31 -30 39 27 -35 33 43 .. .. .. -36 5 57 173 0 0 -33 19 56 15 3 45 5 300 -30 -30 57 35 -35 53 59 .. .. .. -36 26 30 174 0 0 -33 39 56 15 3 43 5 300 -29 .. .. .. -36 15 15 .. .. .. -36 48 4 175 0 0 -34 0 51 15 3 42 4 299 -28 .. .. .. -36 37 30 .. .. .. -37 10 38 176 0 0 -34 22 43 15 3 40 3 299 -28 .. .. .. -37 0 47 .. .. .. -37 34 15 177 0 0 -34 45 31 15 3 39 2 298 -27 .. .. .. -37 25 4 .. .. .. -37 58 53 178 0 0 -35 9 16 15 3 39 1 298 -26 .. .. .. .. .. .. .. .. .. .. .. .. 179 0 0 -35 33 57 15 3 39 0 297 -25 .. .. .. .. .. .. .. .. .. .. .. .. Data for the target star ------------------------ * name: UCAC2 39471892 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 02 02.5750 DE: +21 48 10.100 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .019 ) * V mag [mag]: 11.5 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (15) Eunomia approx. diameter [km]: 255 approx. diameter ["]: .218 distance from Earth [AU]: 1.61000 * orbital information: orbit source: Preston date of fit: 2008 Jan 30 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1600 number of rejected observations: 170 time covered by the observations: 1905 Jan 15 - 2008 Jan 26 1 sigma uncertainty ellipse (major, minor, PA): 0.016, 0.010, 108° remarks: * orbital elements for (15) Eunomia : Mean anomaly = 63.85020425 deg Arg. of pericenter = 97.88597456 deg Long. of node = 293.26748586 deg Inclination = 11.73854074 deg Eccentricity = 0.18743488 Semimajor axis = 2.64397323 AU Perihelion dist = 2.14840042 AU Mag: H = 5.27, G = 0.23 Epoch of elements : MJD 54500.63200000 TDT (2008 Feb 04.632) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Feb 04 15 Eunomia 15h 10.3m UT 11.5 7 2 2.575 21 48 10.10UCAC2 39471892 0.0 8.9 255 31.4 1.610 -1.680 -8.85 103.767 21.804 315.89 -16.28 15.1720 .30324 -.80356 -4.28844 -1.61982 0.00296 -0.00024 2000 63.70531492008 2 4.00000 97.885975293.267486 11.7385410.187434882.643973232.148400425.285 0.23 RATE 2.2925483 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.025 0.021 97.2 1.100 0.022 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jan 30, 22:29 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org