IOTA/IOTA-ES occultation update for (15) Eunomia / TYC 1339-00736-1 event on 2008 Mar 04, 00:59 UT Visible from W Africa Summary ------- On 2008 Mar 04 UT, the 255 km diameter asteroid (15) Eunomia will occult a 11.7 mag star in the constellation Gemini for observers along a path across W Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.1 mag to 9.6 mag (the magnitude of the asteroid) for at most 60.9 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 Mar 04, 00:42 - 2008 Mar 04, 01:16 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 0.1 * estimated maximum duration [s]: 60.9 * Moon: 15 % sunlit, 163° distance * Sun: 119° distance * rough path description: W Africa The occultation path -------------------- * approximate projected width [km]: 372 * 1 sigma uncertainty interval [path widths]: +/- 0.11 * 1 sigma uncertainty interval [seconds]: +/- 6.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .020 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .021", .020", 4° ) * approx speed of asteroid's shadow [km/s]: 4.1893 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1339-00736-1 by 15 Eunomia on 2008 Mar 4 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude 97 56 53 71 59 51 0 42 23 3 347 -1 ... .. .. .. .. .. 93 18 28 79 25 22 ... .. .. .. .. .. 92 34 20 80 24 45 87 13 42 78 8 43 0 42 50 9 337 -5 ... .. .. .. .. .. 80 19 30 82 17 44 ... .. .. .. .. .. 78 27 1 83 2 16 73 56 45 80 53 51 0 43 17 13 324 -8 83 1 43 76 27 4 61 5 35 83 56 25 85 0 40 75 2 44 57 11 45 84 29 7 56 58 37 82 21 28 0 43 44 16 308 -10 70 2 38 79 14 45 37 32 5 84 26 11 72 26 40 78 22 46 32 3 57 84 45 18 38 19 39 82 47 39 0 44 11 18 290 -11 55 8 0 80 38 47 16 33 17 83 57 20 58 13 28 80 2 7 11 18 36 84 4 33 21 37 41 82 25 47 0 44 39 20 274 -13 39 42 30 81 5 47 1 53 32 82 53 36 43 16 24 80 40 46 - 2 21 38 82 53 21 8 50 26 81 33 9 0 45 6 22 261 -14 25 47 38 80 50 45 - 7 35 55 81 34 13 29 23 57 80 35 6 - 10 57 43 81 29 51 - 0 18 19 80 23 58 0 45 33 23 253 -16 14 31 35 80 7 38 - 13 49 22 80 9 2 17 51 3 79 58 59 - 16 32 20 80 2 26 - 6 47 22 79 6 54 0 46 0 25 247 -17 5 54 29 79 7 41 - 18 3 24 78 42 28 8 50 20 79 3 57 - 20 18 50 78 34 37 - 11 27 38 77 46 32 0 46 27 26 243 -19 - 0 34 16 77 58 27 - 21 2 34 77 16 25 1 58 41 77 58 2 - 22 58 5 77 7 53 - 14 54 6 76 25 15 0 46 55 27 240 -20 - 5 27 39 76 44 25 - 23 12 43 75 51 42 - 3 14 19 76 46 14 - 24 53 25 75 42 49 - 17 29 30 75 4 15 0 47 22 29 238 -21 - 9 11 50 75 28 12 - 24 49 27 74 28 40 - 7 14 34 75 31 32 - 26 18 47 74 19 37 - 19 28 38 73 44 9 0 47 49 30 237 -22 - 12 5 40 74 11 16 - 26 2 31 73 7 25 - 10 21 24 74 15 39 - 27 22 56 72 58 17 - 21 1 19 72 25 15 0 48 16 31 236 -24 - 14 22 20 72 54 28 - 26 58 19 71 47 54 - 12 48 39 72 59 33 - 28 11 34 71 38 48 - 22 14 14 71 7 40 0 48 44 32 236 -25 - 16 11 6 71 38 14 - 27 41 9 70 30 5 - 14 46 4 71 43 49 - 28 48 32 70 21 2 - 23 12 2 69 51 25 0 49 11 33 235 -26 - 17 38 31 70 22 51 - 28 14 2 69 13 51 - 16 20 38 70 28 47 - 29 16 32 69 4 54 - 23 58 3 68 36 30 0 49 38 34 235 -27 - 18 49 19 69 8 27 - 28 39 7 67 59 6 - 17 37 25 69 14 36 - 29 37 30 67 50 16 - 24 34 43 67 22 51 0 50 5 35 235 -28 - 19 46 57 67 55 4 - 28 57 59 66 45 46 - 18 40 7 68 1 23 - 29 52 50 66 37 3 - 25 3 50 66 10 26 0 50 32 35 236 -29 - 20 34 1 66 42 43 - 29 11 47 65 33 43 - 19 31 30 66 49 8 - 30 3 36 65 25 8 - 25 26 47 64 59 9 0 51 0 36 236 -30 - 21 12 27 65 31 24 - 29 21 27 64 22 52 - 20 13 40 65 37 51 - 30 10 37 64 14 26 - 25 44 37 63 48 58 0 51 27 37 237 -31 - 21 43 47 64 21 3 - 29 27 39 63 13 9 - 20 48 14 64 27 32 - 30 14 29 63 4 51 - 25 58 10 62 39 48 0 51 54 38 237 -33 - 22 9 10 63 11 40 - 29 30 56 62 4 28 - 21 16 27 63 18 8 - 30 15 43 61 56 18 - 26 8 4 61 31 35 0 52 21 38 238 -34 - 22 29 32 62 3 10 - 29 31 44 60 56 45 - 21 39 19 62 9 37 - 30 14 40 60 48 43 - 26 14 51 60 24 15 0 52 48 39 239 -35 - 22 45 37 60 55 31 - 29 30 23 59 49 56 - 21 57 37 61 1 56 - 30 11 41 59 42 1 - 26 18 56 59 17 45 0 53 16 39 240 -36 - 22 58 1 59 48 40 - 29 27 10 58 43 56 - 22 11 59 59 55 2 - 30 7 0 58 36 10 - 26 20 39 58 12 1 0 53 43 40 240 -37 - 23 7 12 58 42 35 - 29 22 19 57 38 43 - 22 22 57 58 48 53 - 30 0 48 57 31 4 - 26 20 18 57 7 1 0 54 10 40 241 -38 - 23 13 35 57 37 11 - 29 16 0 56 34 13 - 22 30 56 57 43 26 - 29 53 17 56 26 42 - 26 18 6 56 2 41 0 54 37 41 242 -39 - 23 17 29 56 32 28 - 29 8 23 55 30 24 - 22 36 16 56 38 38 - 29 44 33 55 23 0 - 26 14 15 54 58 58 0 55 4 41 243 -40 - 23 19 10 55 28 21 - 28 59 36 54 27 11 - 22 39 15 55 34 27 - 29 34 45 54 19 54 - 26 8 53 53 55 50 0 55 32 42 244 -41 - 23 18 52 54 24 48 - 28 49 44 53 24 32 - 22 40 8 54 30 50 - 29 23 57 53 17 23 - 26 2 10 52 53 14 0 55 59 42 246 -42 - 23 16 46 53 21 48 - 28 38 52 52 22 26 - 22 39 7 53 27 45 - 29 12 15 52 15 23 - 25 54 12 51 51 8 0 56 26 42 247 -43 - 23 13 1 52 19 17 - 28 27 5 51 20 48 - 22 36 22 52 25 9 - 28 59 41 51 13 52 - 25 45 3 50 49 29 0 56 53 42 248 -44 - 23 7 45 51 17 13 - 28 14 27 50 19 38 - 22 32 1 51 23 0 - 28 46 20 50 12 49 - 25 34 50 49 48 16 0 57 21 43 249 -45 - 23 1 6 50 15 35 - 28 1 0 49 18 53 - 22 26 12 50 21 17 - 28 32 13 49 12 10 - 25 23 36 48 47 26 0 57 48 43 250 -46 - 22 53 9 49 14 19 - 27 46 47 48 18 31 - 22 19 1 49 19 56 - 28 17 23 48 11 54 - 25 11 23 47 46 57 0 58 15 43 251 -47 - 22 43 59 48 13 25 - 27 31 50 47 18 29 - 22 10 33 48 18 57 - 28 1 51 47 11 59 - 24 58 16 46 46 47 0 58 42 43 252 -48 - 22 33 39 47 12 50 - 27 16 9 46 18 47 - 22 0 52 47 18 16 - 27 45 39 46 12 23 - 24 44 15 45 46 54 0 59 9 43 254 -49 - 22 22 12 46 12 32 - 26 59 47 45 19 21 - 21 50 1 46 17 53 - 27 28 47 45 13 3 - 24 29 23 44 47 17 0 59 37 43 255 -50 - 22 9 42 45 12 29 - 26 42 44 44 20 11 - 21 38 5 45 17 45 - 27 11 17 44 13 59 - 24 13 40 43 47 53 1 0 4 43 256 -51 - 21 56 11 44 12 40 - 26 25 1 43 21 14 - 21 25 4 44 17 51 - 26 53 9 43 15 9 - 23 57 8 42 48 42 1 0 31 43 257 -52 - 21 41 40 43 13 3 - 26 6 38 42 22 29 - 21 11 1 43 18 8 - 26 34 22 42 16 30 - 23 39 48 41 49 40 1 0 58 43 259 -53 - 21 26 11 42 13 36 - 25 47 35 41 23 55 - 20 55 57 42 18 35 - 26 14 57 41 18 1 - 23 21 39 40 50 48 1 1 25 43 260 -54 - 21 9 44 41 14 17 - 25 27 51 40 25 28 - 20 39 54 41 19 11 - 25 54 54 40 19 41 - 23 2 41 39 52 1 1 1 53 43 261 -55 - 20 52 20 40 15 4 - 25 7 27 39 27 9 - 20 22 51 40 19 52 - 25 34 12 39 21 27 - 22 42 55 38 53 20 1 2 20 43 262 -56 - 20 33 58 39 15 56 - 24 46 21 38 28 55 - 20 4 49 39 20 38 - 25 12 49 38 23 19 - 22 22 19 37 54 42 1 2 47 42 263 -57 - 20 14 40 38 16 51 - 24 24 34 37 30 44 - 19 45 48 38 21 27 - 24 50 47 37 25 14 - 22 0 54 36 56 6 1 3 14 42 265 -58 - 19 54 23 37 17 47 - 24 2 3 36 32 35 - 19 25 47 37 22 17 - 24 28 2 36 27 11 - 21 38 37 35 57 30 1 3 41 42 266 -59 - 19 33 7 36 18 43 - 23 38 47 35 34 27 - 19 4 45 36 23 7 - 24 4 34 35 29 9 - 21 15 27 34 58 52 1 4 9 41 267 -60 - 19 10 52 35 19 35 - 23 14 46 34 36 17 - 18 42 41 35 23 53 - 23 40 21 34 31 5 - 20 51 23 34 0 10 1 4 36 41 268 -62 - 18 47 34 34 20 24 - 22 49 57 33 38 4 - 18 19 34 34 24 34 - 23 15 22 33 32 58 - 20 26 22 33 1 22 1 5 3 41 269 -63 - 18 23 13 33 21 5 - 22 24 17 32 39 45 - 17 55 22 33 25 9 - 22 49 35 32 34 46 - 20 0 23 32 2 26 1 5 30 40 270 -64 - 17 57 45 32 21 38 - 21 57 46 31 41 20 - 17 30 1 32 25 35 - 22 22 56 31 36 27 - 19 33 23 31 3 21 1 5 58 40 272 -65 - 17 31 9 31 22 0 - 21 30 20 30 42 46 - 17 3 29 31 25 49 - 21 55 24 30 38 0 - 19 5 18 30 4 4 1 6 25 39 273 -66 - 17 3 20 30 22 8 - 21 1 56 29 44 1 - 16 35 44 30 25 50 - 21 26 56 29 39 21 - 18 36 4 29 4 32 1 6 52 39 274 -67 - 16 34 15 29 22 1 - 20 32 31 28 45 3 - 16 6 40 29 25 34 - 20 57 28 28 40 30 - 18 5 39 28 4 44 1 7 19 38 275 -68 - 16 3 49 28 21 35 - 20 2 1 27 45 49 - 15 36 13 28 24 59 - 20 26 57 27 41 24 - 17 33 57 27 4 36 1 7 46 37 276 -69 - 15 31 58 27 20 47 - 19 30 23 26 46 17 - 15 4 19 27 24 2 - 19 55 19 26 42 0 - 17 0 52 26 4 6 1 8 14 37 277 -70 - 14 58 34 26 19 35 - 18 57 30 25 46 25 - 14 30 50 26 22 40 - 19 22 28 25 42 16 - 16 26 19 25 3 10 1 8 41 36 278 -71 - 14 23 32 25 17 54 - 18 23 18 24 46 10 - 13 55 39 25 20 48 - 18 48 19 24 42 9 - 15 50 11 24 1 45 1 9 8 35 279 -72 - 13 46 42 24 15 41 - 17 47 40 23 45 28 - 13 18 39 24 18 23 - 18 12 47 23 41 36 - 15 12 20 22 59 46 1 9 35 34 280 -73 - 13 7 56 23 12 50 - 17 10 30 22 44 16 - 12 39 39 23 15 20 - 17 35 44 22 40 33 - 14 32 36 21 57 10 1 10 2 33 280 -74 - 12 27 3 22 9 17 - 16 31 38 21 42 29 - 11 58 27 22 11 34 - 16 57 3 21 38 57 - 13 50 47 20 53 52 1 10 30 32 281 -75 - 11 43 48 21 4 56 - 15 50 56 20 40 5 - 11 14 50 21 6 58 - 16 16 33 20 36 43 - 13 6 42 19 49 44 1 10 57 31 282 -76 - 10 57 56 19 59 40 - 15 8 13 19 36 56 - 10 28 31 20 1 25 - 15 34 6 19 33 47 - 12 20 3 18 44 42 1 11 24 30 283 -77 - 10 9 8 18 53 21 - 14 23 15 18 32 59 - 9 39 9 18 54 47 - 14 49 27 18 30 2 - 11 30 33 17 38 36 1 11 51 29 284 -78 - 9 16 59 17 45 48 - 13 35 47 17 28 5 - 8 46 18 17 46 52 - 14 2 21 17 25 23 - 10 37 47 16 31 16 1 12 19 28 285 -79 - 8 20 59 16 36 48 - 12 45 29 16 22 7 - 7 49 28 16 37 28 - 13 12 32 16 19 41 - 9 41 16 15 22 32 1 12 46 27 285 -79 - 7 20 29 15 26 8 - 11 51 59 15 14 56 - 6 47 55 15 26 17 - 12 19 36 15 12 48 - 8 40 23 14 12 7 1 13 13 25 286 -80 - 6 14 39 14 13 25 - 10 54 49 14 6 19 - 5 40 45 14 12 59 - 11 23 7 14 4 32 - 7 34 20 12 59 42 1 13 40 24 287 -80 - 5 2 18 12 58 13 - 9 53 20 12 56 2 - 4 26 41 12 57 3 - 10 22 29 12 54 39 - 6 22 0 11 44 52 1 14 7 22 287 -79 - 3 41 46 11 39 54 - 8 46 47 11 43 46 - 3 3 53 11 37 46 - 9 16 59 11 42 52 - 5 1 49 10 27 0 1 14 35 21 288 -79 - 2 10 34 10 17 28 - 7 34 5 10 29 5 - 1 29 29 10 14 3 - 8 5 36 10 28 46 - 3 31 30 9 5 12 1 15 2 19 288 -78 - 0 24 33 8 49 22 - 6 13 43 9 11 25 0 21 20 8 44 4 - 6 46 59 9 11 50 - 1 47 18 7 38 3 1 15 29 16 289 -76 1 44 5 7 12 39 - 4 43 31 7 49 55 2 38 9 7 4 11 - 5 19 7 7 51 18 0 17 35 6 2 59 1 15 56 14 289 -74 4 33 58 5 20 20 - 2 59 58 6 23 14 5 46 37 5 4 50 - 3 38 54 6 25 57 2 58 16 4 14 19 1 16 23 11 290 -71 9 35 38 2 38 42 - 0 56 49 4 49 0 ... .. .. .. .. .. - 1 40 57 4 53 45 7 10 53 1 51 6 1 16 51 6 290 -66 ... .. .. .. .. .. 1 39 17 3 2 12 ... .. .. .. .. .. 0 45 34 3 10 37 Uncertainty in time = +/- 7 secs [Prediction of 2008 Feb 27.0] Data for the target star ------------------------ * name: TYC 1339-00736-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 55 38.0991 DE: +20 12 14.889 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .016, .019 ) * V mag [mag]: 11.7 * B mag [mag]: 12.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (15) Eunomia approx. diameter [km]: 255 approx. diameter ["]: .182 distance from Earth [AU]: 1.93000 * orbital information: orbit source: Preston date of fit: 2008 Feb 27 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1607 number of rejected observations: 173 time covered by the observations: 1905 Jan 15 - 2008 Feb 12 1 sigma uncertainty ellipse (major, minor, PA): 0.012, 0.009, 109° remarks: * orbital elements for (15) Eunomia : Mean anomaly = 70.36764175 deg Arg. of pericenter = 97.87998629 deg Long. of node = 293.26752890 deg Inclination = 11.73862651 deg Eccentricity = 0.18744486 Semimajor axis = 2.64393297 AU Perihelion dist = 2.14834132 AU Mag: H = 5.27, G = 0.23 Epoch of elements : MJD 54529.04100000 TDT (2008 Mar 04.041) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 4 15 Eunomia 0h 59.6m UT 11.7 6 55 38.099 20 12 14.89TYC 1339-00736-1 12.4 9.6 255 60.9 1.930 0.522 -7.90 -73.1627 20.207 168.04 -6.36 0.9935 0.53281 0.49538 1.60750 -1.73409 0.00503 -0.00035 2000 68.2949022008 224.00000 97.879986293.267529 11.7386270.18744486 2.6439330 2.1483413 5.3 5.00.23 RATE 2.2926000 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.021 0.020 4 1.11 0.021 0 54523.5020080304_0736-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 27, 19:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org