IOTA/IOTA-ES occultation update for (392) Wilhelmina / TYC 0750-00247-1 event on 2008 May 11, 19:45 UT Visible from Europe Summary ------- On 2008 May 11 UT, the 63 km diameter asteroid (392) Wilhelmina will occult a 11.2 mag star in the constellation Monoceros for observers along a path across Europe. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.3 mag to 15.5 mag (the magnitude of the asteroid) for at most 1.7 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: 62 * date and approx. time of event: 2008 May 11, 19:47 - 2008 May 11, 19:47 UT * magnitude of target star: 11.2 * magnitude drop [mag]: 4.3 * estimated maximum duration [s]: 1.7 * Moon: 47 % sunlit, 38° distance * Sun: 51° distance * rough path description: Europe The occultation path -------------------- * approximate projected width [km]: 81 * 1 sigma uncertainty interval [path widths]: +/- 0.99 * 1 sigma uncertainty interval [seconds]: +/- 1.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .024 +/- .026) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .024", 1° ) * approx speed of asteroid's shadow [km/s]: 36.4014 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0750-00247-1 by 392 Wilhelmina on 2008 May 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 - 7 0 0 46 42 14 19 47 22 29 254 0 46 19 45 47 4 51 45 35 35 47 50 0 - 6 0 0 46 33 42 19 47 24 29 255 -1 46 11 12 46 56 20 45 27 1 47 41 30 - 5 0 0 46 25 2 19 47 25 28 256 -2 46 2 32 46 47 41 45 18 18 47 32 52 - 4 0 0 46 16 15 19 47 26 27 257 -2 45 53 43 46 38 54 45 9 28 47 24 7 - 3 0 0 46 7 19 19 47 28 27 257 -3 45 44 47 46 29 59 45 0 31 47 15 14 - 2 0 0 45 58 16 19 47 29 26 258 -4 45 35 43 46 20 56 44 51 25 47 6 13 - 1 0 0 45 49 5 19 47 30 26 259 -4 45 26 32 46 11 46 44 42 13 46 57 4 0 0 0 45 39 47 19 47 31 25 260 -5 45 17 13 46 2 29 44 32 53 46 47 49 1 0 0 45 30 22 19 47 32 24 261 -6 45 7 47 45 53 5 44 23 25 46 38 25 2 0 0 45 20 50 19 47 34 24 262 -6 44 58 14 45 43 33 44 13 51 46 28 55 3 0 0 45 11 10 19 47 35 23 263 -7 44 48 34 45 33 54 44 4 10 46 19 18 4 0 0 45 1 24 19 47 36 22 263 -8 44 38 47 45 24 9 43 54 22 46 9 34 5 0 0 44 51 31 19 47 37 21 264 -8 44 28 54 45 14 16 43 44 27 45 59 43 6 0 0 44 41 32 19 47 38 21 265 -9 44 18 53 45 4 18 43 34 26 45 49 45 7 0 0 44 31 26 19 47 39 20 266 -10 44 8 47 44 54 12 43 24 18 45 39 41 8 0 0 44 21 14 19 47 40 19 267 -10 43 58 34 44 44 1 43 14 4 45 29 31 9 0 0 44 10 56 19 47 41 19 267 -11 43 48 16 44 33 43 43 3 44 45 19 14 10 0 0 44 0 31 19 47 42 18 268 -12 43 37 51 44 23 20 42 53 19 45 8 52 11 0 0 43 50 1 19 47 43 17 269 -12 43 27 20 44 12 50 42 42 47 44 58 23 12 0 0 43 39 26 19 47 44 16 270 -13 43 16 44 44 2 15 42 32 10 44 47 49 13 0 0 43 28 45 19 47 44 16 270 -14 43 6 3 43 51 35 42 21 28 44 37 10 14 0 0 43 17 59 19 47 45 15 271 -14 42 55 16 43 40 49 42 10 40 44 26 25 15 0 0 43 7 8 19 47 46 14 272 -15 42 44 25 43 29 58 41 59 48 44 15 35 16 0 0 42 56 11 19 47 47 14 272 -16 42 33 28 43 19 2 41 48 51 44 4 40 17 0 0 42 45 11 19 47 47 13 273 -16 42 22 27 43 8 2 41 37 49 43 53 40 18 0 0 42 34 5 19 47 48 12 274 -17 42 11 21 42 56 57 41 26 42 43 42 36 19 0 0 42 22 56 19 47 49 11 275 -18 42 0 11 42 45 48 41 15 32 43 31 28 20 0 0 42 11 42 19 47 49 11 275 -18 41 48 57 42 34 34 41 4 17 43 20 15 21 0 0 42 0 24 19 47 50 10 276 -19 41 37 40 42 23 17 40 52 59 43 8 58 22 0 0 41 49 3 19 47 50 9 277 -20 41 26 18 42 11 56 40 41 37 42 57 37 23 0 0 41 37 38 19 47 51 8 277 -20 41 14 53 42 0 31 40 30 12 42 46 13 24 0 0 41 26 10 19 47 51 7 278 -21 41 3 25 41 49 4 40 18 43 42 34 46 25 0 0 41 14 39 19 47 52 7 279 -21 40 51 54 41 37 33 40 7 12 42 23 15 26 0 0 41 3 5 19 47 52 6 279 -22 40 40 20 41 25 59 39 55 37 42 11 42 27 0 0 40 51 29 19 47 52 5 280 -23 40 28 43 41 14 23 39 44 1 42 0 6 28 0 0 40 39 50 19 47 52 4 281 -23 40 17 4 41 2 44 .. .. .. 41 48 27 29 0 0 40 28 9 19 47 53 4 281 -24 40 5 23 40 51 3 .. .. .. 41 36 46 30 0 0 40 16 26 19 47 53 3 282 -25 39 53 40 40 39 20 .. .. .. 41 25 3 31 0 0 40 4 42 19 47 53 2 283 -25 39 41 56 40 27 35 .. .. .. 41 13 19 32 0 0 39 52 56 19 47 53 1 283 -26 39 30 10 40 15 49 .. .. .. 41 1 32 33 0 0 39 41 8 19 47 53 0 284 -26 39 18 23 40 4 2 .. .. .. 40 49 45 Uncertainty in time = +/- 2 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: TYC 0750-00247-1 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 44 55.0810 DE: +10 57 22.670 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .024 ) * V mag [mag]: 11.2 * B mag [mag]: 12.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (392) Wilhelmina approx. diameter [km]: 63 approx. diameter ["]: .026 distance from Earth [AU]: 3.37300 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 818 number of rejected observations: 60 time covered by the observations: 1933 Oct 23 - 2008 Mar 01 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.008, 98° remarks: * orbital elements for (392) Wilhelmina : Mean anomaly = 76.73084411 deg Arg. of pericenter = 174.98299468 deg Long. of node = 209.89981307 deg Inclination = 14.32384101 deg Eccentricity = 0.13956542 Semimajor axis = 2.88492837 AU Perihelion dist = 2.48229213 AU Mag: H = 9.71, G = 0.15 Epoch of elements : MJD 54597.82300000 TDT (2008 May 11.823) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 11 392 Wilhelmina 19h 45.6m UT 11.2 6 44 55.081 10 57 22.67TYC 0750-00247-1 12.6 15.5 63 1.7 3.373 3.637 0.80 -65.1419 10.957 -117.31 18.13 19.7605 -0.01033 0.63380 20.54362 0.31057 0.00422 -0.00110 2000 75.1573152008 5 4.00000174.982995209.899813 14.3238410.13956542 2.8849284 2.4822921 9.7 5.00.15 RATE 2.0114140 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.026 0.024 1 1.99 0.025 0 54594.5020080511_0247-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org