IOTA/IOTA-ES occultation update for (45) Eugenia / 2UCAC 38767454 event on 2008 May 19, 11:33 UT Visible from Japan Summary ------- On 2008 May 19 UT, the 215 km diameter asteroid (45) Eugenia will occult a 12.3 mag star in the constellation Gemini for observers along a path across Japan. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.4 mag to 13.3 mag (the magnitude of the asteroid) for at most 5.4 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: 99 * date and approx. time of event: 2008 May 19, 11:35 - 2008 May 19, 11:35 UT * midpoint of event [JD]: 2454605.9816 * magnitude of target star: 12.3 * magnitude drop [mag]: 1.4 * estimated maximum duration [s]: 5.4 * Moon: 99 % sunlit, 135° distance * Sun: 38° distance * rough path description: Japan The occultation path -------------------- * approximate projected width [km]: 253 * 1 sigma uncertainty interval [path widths]: +/- 0.24 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .020 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .020", .020", 90° ) * approx speed of asteroid's shadow [km/s]: 39.6236 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 38767454 by 45 Eugenia on 2008 May 19 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 115 0 0 42 5 55 11 35 23 28 272 0 40 52 24 43 20 29 40 17 28 43 56 41 116 0 0 41 47 47 11 35 24 28 273 -1 40 34 11 43 2 27 39 59 13 43 38 42 117 0 0 41 29 25 11 35 26 27 274 -2 40 15 44 42 44 11 39 40 43 43 20 28 118 0 0 41 10 49 11 35 27 26 274 -3 39 57 3 42 25 40 39 22 0 43 2 0 119 0 0 40 52 0 11 35 28 25 275 -4 39 38 9 42 6 56 39 3 4 42 43 18 120 0 0 40 32 58 11 35 29 25 276 -5 39 19 2 41 47 58 38 43 54 42 24 23 121 0 0 40 13 42 11 35 30 24 277 -5 38 59 42 41 28 47 38 24 33 42 5 15 122 0 0 39 54 14 11 35 31 23 277 -6 38 40 10 41 9 24 38 4 58 41 45 53 123 0 0 39 34 34 11 35 33 22 278 -7 38 20 25 40 49 48 37 45 12 41 26 19 124 0 0 39 14 41 11 35 34 21 279 -8 38 0 29 40 29 59 37 25 14 41 6 33 125 0 0 38 54 37 11 35 35 21 280 -9 37 40 22 40 9 59 37 5 5 40 46 34 126 0 0 38 34 22 11 35 36 20 280 -10 37 20 3 39 49 47 36 44 45 40 26 24 127 0 0 38 13 56 11 35 37 19 281 -10 36 59 34 39 29 24 36 24 14 40 6 3 128 0 0 37 53 19 11 35 37 18 282 -11 36 38 54 39 8 50 36 3 33 39 45 30 129 0 0 37 32 32 11 35 38 17 282 -12 36 18 5 38 48 6 35 42 43 39 24 48 130 0 0 37 11 36 11 35 39 16 283 -13 35 57 6 38 27 12 35 21 43 39 3 55 131 0 0 36 50 30 11 35 40 15 284 -14 35 35 58 38 6 9 35 0 34 38 42 52 132 0 0 36 29 16 11 35 41 15 284 -15 35 14 42 37 44 56 34 39 17 38 21 41 133 0 0 36 7 53 11 35 41 14 285 -15 34 53 18 37 23 35 34 17 52 38 0 20 134 0 0 35 46 22 11 35 42 13 286 -16 34 31 46 37 2 5 33 56 19 37 38 51 135 0 0 35 24 44 11 35 43 12 286 -17 34 10 6 36 40 28 33 34 39 37 17 15 136 0 0 35 2 59 11 35 43 11 287 -18 33 48 20 36 18 44 33 12 53 36 55 31 137 0 0 34 41 7 11 35 44 10 287 -19 33 26 28 35 56 53 32 51 1 36 33 40 138 0 0 34 19 10 11 35 44 9 288 -20 33 4 31 35 34 55 32 29 3 36 11 42 139 0 0 33 57 7 11 35 45 8 288 -21 32 42 28 35 12 52 32 7 0 35 49 39 140 0 0 33 34 59 11 35 45 7 289 -21 32 20 20 34 50 44 31 44 53 35 27 31 141 0 0 33 12 47 11 35 46 7 290 -22 31 58 9 34 28 31 31 22 42 35 5 18 142 0 0 32 50 31 11 35 46 6 290 -23 31 35 54 34 6 14 31 0 27 34 43 0 143 0 0 32 28 11 11 35 46 5 291 -24 31 13 36 33 43 54 30 38 10 34 20 39 144 0 0 32 5 49 11 35 46 4 291 -25 30 51 15 33 21 30 30 15 50 33 58 15 145 0 0 31 43 25 11 35 47 3 292 -26 30 28 53 32 59 4 29 53 28 33 35 48 146 0 0 31 20 59 11 35 47 2 292 -27 30 6 29 32 36 36 29 31 5 33 13 19 147 0 0 30 58 33 11 35 47 1 293 -27 29 44 4 32 14 7 29 8 42 32 50 49 148 0 0 30 36 5 11 35 47 0 293 -28 .. .. .. 31 51 38 .. .. .. 32 28 18 Uncertainty in time = +/- 1 secs [Prediction of 2008 Apr 13.0] Data for the target star ------------------------ * name: 2UCAC 38767454 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 28 14.1976 DE: +19 59 21.312 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .020 ) * V mag [mag]: 12.3 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 97.1814023747 DE(deg): 19.9853016176 * Equation of equinoxes (radians) : 0.000039607177596 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (45) Eugenia approx. diameter [km]: 215 approx. diameter ["]: .083 distance from Earth [AU]: 3.56100 * orbital information: orbit source: Preston date of fit: 2008 Apr 08 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 1415 number of rejected observations: 182 time covered by the observations: 1910 Feb 14 - 2008 Feb 17 1 sigma uncertainty ellipse (major, minor, PA): 0.007, 0.005, 88° remarks: * orbital elements for (45) Eugenia : Mean anomaly = 243.76160226 deg Arg. of pericenter = 85.49489397 deg Long. of node = 147.92088034 deg Inclination = 6.60930480 deg Eccentricity = 0.08174422 Semimajor axis = 2.72123247 AU Perihelion dist = 2.49878746 AU Mag: H = 7.40, G = 0.07 Epoch of elements : MJD 54605.48200000 TDT (2008 May 19.482) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 19 45 Eugenia 11h 33.5m UT 12.3 6 28 14.198 19 59 21.312UCAC 38767454 0.0 13.3 215 5.4 3.561 3.918 0.65 46.1724 19.989 5.75 19.91 11.5584 -0.00710 0.52816 22.36307 0.26512 0.00341 -0.00042 2000 242.5579672008 514.00000 85.494894147.920880 6.6093050.08174422 2.7212325 2.4987874 7.5 5.00.07 RATE 2.1956130 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.020 0.020 90 1.24 0.020 2 13 1190 6 0 54569.5020080519_767454 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 13, 03:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org