IOTA/IOTA-ES occultation update for (112) Iphigenia / 2UCAC 40305094 event on 2008 Apr 01, 03:38 UT Visible from Canada, USA Summary ------- On 2008 Apr 01 UT, the 72 km diameter asteroid (112) Iphigenia will occult a 11.8 mag star in the constellation Taurus for observers along a path across Canada, USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 15.1 mag (the magnitude of the asteroid) for at most 2.3 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: 40 * date and approx. time of event: 2008 Apr 01, 03:37 - 2008 Apr 01, 03:38 UT * midpoint of event [JD]: 2454557.64980833 * magnitude of target star: 11.8 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 2.3 * Moon: 28 % sunlit, 126° distance * Sun: 62° distance * rough path description: Canada, USA The occultation path -------------------- * approximate projected width [km]: 85 * 1 sigma uncertainty interval [path widths]: +/- 1.64 * 1 sigma uncertainty interval [seconds]: +/- 3.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .063 +/- .058) * 1 sigma uncertainty ellipse (major, minor, PA): ( .063", .058", 90° ) * approx speed of asteroid's shadow [km/s]: 31.4515 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 40305094 by 112 Iphigenia on 2008 Apr 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 -136 0 0 55 11 6 3 37 1 49 235 0 54 47 49 55 34 30 53 32 5 56 51 56 -135 0 0 55 3 53 3 37 3 49 237 -1 54 40 33 55 27 19 53 24 42 56 44 54 -134 0 0 54 56 21 3 37 5 48 238 -2 54 32 58 55 19 49 53 16 59 56 37 32 -133 0 0 54 48 30 3 37 7 48 239 -2 54 25 5 55 12 1 53 8 57 56 29 53 -132 0 0 54 40 19 3 37 9 48 241 -3 54 16 52 55 3 53 53 0 36 56 21 55 -131 0 0 54 31 50 3 37 10 47 242 -3 54 8 20 54 55 27 52 51 55 56 13 38 -130 0 0 54 23 2 3 37 12 47 243 -4 53 59 28 54 46 41 52 42 54 56 5 2 -129 0 0 54 13 54 3 37 14 46 244 -5 53 50 18 54 37 36 52 33 34 55 56 7 -128 0 0 54 4 26 3 37 16 46 246 -5 53 40 47 54 28 12 52 23 54 55 46 53 -127 0 0 53 54 39 3 37 18 45 247 -6 53 30 57 54 18 28 52 13 54 55 37 19 -126 0 0 53 44 33 3 37 20 45 248 -6 53 20 47 54 8 24 52 3 35 55 27 26 -125 0 0 53 34 6 3 37 21 44 249 -7 53 10 18 53 58 1 51 52 55 55 17 14 -124 0 0 53 23 20 3 37 23 44 250 -8 52 59 28 53 47 18 51 41 54 55 6 42 -123 0 0 53 12 13 3 37 25 43 251 -8 52 48 18 53 36 14 51 30 34 54 55 50 -122 0 0 53 0 46 3 37 27 43 253 -9 52 36 48 53 24 51 51 18 53 54 44 38 -121 0 0 52 48 59 3 37 29 42 254 -10 52 24 57 53 13 7 51 6 52 54 33 6 -120 0 0 52 36 51 3 37 31 42 255 -10 52 12 46 53 1 3 50 54 29 54 21 14 -119 0 0 52 24 23 3 37 32 41 256 -11 52 0 14 52 48 39 50 41 46 54 9 1 -118 0 0 52 11 34 3 37 34 41 257 -11 51 47 22 52 35 53 50 28 43 53 56 28 -117 0 0 51 58 25 3 37 36 40 258 -12 51 34 9 52 22 48 50 15 18 53 43 34 -116 0 0 51 44 54 3 37 38 40 259 -13 51 20 35 52 9 21 50 1 32 53 30 20 -115 0 0 51 31 3 3 37 39 39 260 -13 51 6 40 51 55 33 49 47 26 53 16 45 -114 0 0 51 16 50 3 37 41 38 261 -14 50 52 23 51 41 24 49 32 58 53 2 49 -113 0 0 51 2 17 3 37 43 38 262 -15 50 37 46 51 26 54 49 18 9 52 48 32 -112 0 0 50 47 22 3 37 45 37 263 -15 50 22 47 51 12 3 49 2 58 52 33 53 -111 0 0 50 32 6 3 37 46 37 264 -16 50 7 28 50 56 51 48 47 26 52 18 54 -110 0 0 50 16 28 3 37 48 36 265 -17 49 51 46 50 41 17 48 31 33 52 3 33 -109 0 0 50 0 29 3 37 50 35 266 -18 49 35 44 50 25 22 48 15 18 51 47 51 -108 0 0 49 44 9 3 37 51 35 267 -18 49 19 20 50 9 6 47 58 42 51 31 47 -107 0 0 49 27 27 3 37 53 34 268 -19 49 2 34 49 52 28 47 41 45 51 15 22 -106 0 0 49 10 24 3 37 55 33 269 -20 48 45 27 49 35 28 47 24 26 50 58 35 -105 0 0 48 52 59 3 37 56 33 270 -20 48 27 58 49 18 7 47 6 45 50 41 27 -104 0 0 48 35 12 3 37 58 32 271 -21 48 10 8 49 0 24 46 48 43 50 23 57 -103 0 0 48 17 4 3 38 0 31 272 -22 47 51 56 48 42 20 46 30 20 50 6 5 -102 0 0 47 58 35 3 38 1 31 273 -23 47 33 23 48 23 54 46 11 35 49 47 52 -101 0 0 47 39 44 3 38 3 30 274 -23 47 14 29 48 5 7 45 52 30 49 29 17 -100 0 0 47 20 32 3 38 4 29 275 -24 46 55 13 47 45 58 45 33 2 49 10 21 - 99 0 0 47 0 58 3 38 6 29 276 -25 46 35 36 47 26 28 45 13 14 48 51 3 - 98 0 0 46 41 4 3 38 7 28 277 -25 46 15 38 47 6 37 44 53 5 48 31 23 - 97 0 0 46 20 48 3 38 9 27 277 -26 45 55 19 46 46 25 44 32 35 48 11 23 - 96 0 0 46 0 11 3 38 10 26 278 -27 45 34 38 46 25 51 44 11 44 47 51 1 - 95 0 0 45 39 13 3 38 12 26 279 -28 45 13 37 46 4 57 43 50 33 47 30 18 - 94 0 0 45 17 55 3 38 13 25 280 -29 44 52 16 45 43 42 43 29 1 47 9 14 - 93 0 0 44 56 16 3 38 15 24 281 -29 44 30 34 45 22 6 43 7 10 46 47 49 - 92 0 0 44 34 17 3 38 16 23 282 -30 44 8 32 45 0 10 42 44 58 46 26 3 - 91 0 0 44 11 58 3 38 17 23 282 -31 43 46 10 44 37 54 42 22 27 46 3 57 - 90 0 0 43 49 19 3 38 19 22 283 -32 43 23 28 44 15 18 41 59 36 45 41 31 - 89 0 0 43 26 21 3 38 20 21 284 -32 43 0 27 43 52 23 41 36 27 45 18 45 - 88 0 0 43 3 4 3 38 21 20 285 -33 42 37 7 43 29 8 41 12 58 44 55 39 - 87 0 0 42 39 27 3 38 22 19 285 -34 42 13 29 43 5 34 40 49 12 44 32 14 - 86 0 0 42 15 32 3 38 23 19 286 -35 41 49 31 42 41 42 40 25 7 44 8 29 - 85 0 0 41 51 19 3 38 25 18 287 -36 41 25 16 42 17 31 40 0 45 43 44 27 - 84 0 0 41 26 49 3 38 26 17 288 -36 41 0 44 41 53 2 39 36 5 43 20 5 - 83 0 0 41 2 1 3 38 27 16 288 -37 40 35 54 41 28 17 39 11 9 42 55 26 - 82 0 0 40 36 56 3 38 28 15 289 -38 40 10 47 41 3 14 38 45 56 42 30 30 - 81 0 0 40 11 35 3 38 29 14 290 -39 39 45 24 40 37 54 38 20 28 42 5 16 - 80 0 0 39 45 58 3 38 29 13 290 -39 39 19 45 40 12 19 37 54 44 41 39 46 - 79 0 0 39 20 5 3 38 30 13 291 -40 38 53 52 39 46 28 37 28 46 41 14 1 - 78 0 0 38 53 58 3 38 31 12 292 -41 38 27 43 39 20 22 37 2 34 40 47 59 - 77 0 0 38 27 37 3 38 32 11 292 -42 38 1 21 38 54 2 36 36 7 40 21 43 - 76 0 0 38 1 2 3 38 32 10 293 -43 37 34 45 38 27 28 36 9 28 39 55 12 - 75 0 0 37 34 14 3 38 33 9 294 -43 37 7 56 38 0 40 35 42 37 39 28 28 - 74 0 0 37 7 13 3 38 34 8 294 -44 36 40 55 37 33 41 35 15 34 39 1 30 - 73 0 0 36 40 1 3 38 34 7 295 -45 36 13 42 37 6 29 34 48 19 38 34 20 - 72 0 0 36 12 38 3 38 35 6 295 -46 35 46 18 36 39 6 .. .. .. 38 6 59 - 71 0 0 35 45 4 3 38 35 5 296 -47 35 18 45 36 11 33 .. .. .. 37 39 26 - 70 0 0 35 17 21 3 38 35 4 297 -47 34 51 1 35 43 50 .. .. .. 37 11 43 - 69 0 0 34 49 29 3 38 36 3 297 -48 34 23 9 35 15 57 .. .. .. 36 43 50 - 68 0 0 34 21 29 3 38 36 3 298 -49 33 55 10 34 47 57 .. .. .. 36 15 49 - 67 0 0 33 53 21 3 38 36 2 298 -50 33 27 2 34 19 49 .. .. .. 35 47 40 - 66 0 0 33 25 7 3 38 36 1 299 -50 32 58 49 33 51 34 .. .. .. 35 19 23 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 30.0] Data for the target star ------------------------ * name: 2UCAC 40305094 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 48 21.8437 DE: +24 11 43.849 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .062, .057 ) * V mag [mag]: 11.8 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 72.2160253182 DE(deg): 24.2118779899 * Equation of equinoxes (radians) : 0.000041583691852 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (112) Iphigenia approx. diameter [km]: 72 approx. diameter ["]: .035 distance from Earth [AU]: 2.83200 * orbital information: orbit source: Preston date of fit: 2008 Mar 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1146 number of rejected observations: 51 time covered by the observations: 1902 Jan 08 - 2008 Mar 05 1 sigma uncertainty ellipse (major, minor, PA): 0.014, 0.008, 84° remarks: * orbital elements for (112) Iphigenia : Mean anomaly = 99.57488887 deg Arg. of pericenter = 16.98777046 deg Long. of node = 323.64042680 deg Inclination = 2.60583070 deg Eccentricity = 0.12812101 Semimajor axis = 2.43406001 AU Perihelion dist = 2.12220579 AU Mag: H = 9.60, G = 0.15 Epoch of elements : MJD 54557.15100000 TDT (2008 Apr 01.151) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 1 112 Iphigenia 3h 35.7m UT 11.8 4 48 21.844 24 11 43.852UCAC 40305094 0.0 15.1 72 2.3 2.832 4.014 4.74 -171.7137 24.195 127.04 4.66 3.5954 -0.04633 0.52238 17.68618 1.52837 0.00498 0.00070 2000 97.7189062008 325.00000 16.987770323.640427 2.6058310.12812101 2.4340600 2.1222058 9.8 5.00.15 RATE 2.5954170 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.063 0.058 90 2.64 0.058 0 54555.5020080401_305094 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 30, 16:52 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org