IOTA/IOTA-ES occultation update for (45) Eugenia / TYC 1322-00982-1 event on 2008 May 10, 23:57 UT Visible from Ecuador, Peru, Brazil Summary ------- On 2008 May 10 UT, the 215 km diameter asteroid (45) Eugenia will occult a 10.0 mag star in the constellation Orion for observers along a path across Ecuador, Peru, Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.4 mag to 13.3 mag (the magnitude of the asteroid) for at most 5.7 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 10, 23:59 - 2008 May 10, 23:59 UT * midpoint of event [JD]: 2454597.49802917 * magnitude of target star: 10.0 * magnitude drop [mag]: 3.4 * estimated maximum duration [s]: 5.7 * Moon: 38 % sunlit, 33° distance * Sun: 43° distance * rough path description: Ecuador, Peru, Brazil The occultation path -------------------- * approximate projected width [km]: 221 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 1.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .015 +/- .018) * 1 sigma uncertainty ellipse (major, minor, PA): ( .018", .015", 360° ) * approx speed of asteroid's shadow [km/s]: 37.7912 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1322-00982-1 by 45 Eugenia on 2008 May 10 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 - 90 0 0 2 4 0 23 59 8 43 295 0 1 2 22 3 5 22 0 36 24 3 31 3 - 89 0 0 1 50 13 23 59 10 42 295 -1 0 48 31 2 51 39 0 22 31 3 17 22 - 88 0 0 1 36 7 23 59 12 41 295 -2 0 34 21 2 37 37 0 8 19 3 3 22 - 87 0 0 1 21 43 23 59 14 40 295 -3 0 19 52 2 23 17 - 0 6 12 2 49 4 - 86 0 0 1 6 59 23 59 16 39 295 -4 0 5 5 2 8 38 - 0 21 1 2 34 27 - 85 0 0 0 51 58 23 59 18 37 295 -5 - 0 10 1 1 53 41 - 0 36 8 2 19 31 - 84 0 0 0 36 39 23 59 20 36 295 -6 - 0 25 24 1 38 26 - 0 51 34 2 4 18 - 83 0 0 0 21 2 23 59 21 35 294 -7 - 0 41 6 1 22 53 - 1 7 17 1 48 48 - 82 0 0 0 5 8 23 59 23 34 294 -8 - 0 57 4 1 7 3 - 1 23 17 1 32 59 - 81 0 0 - 0 11 3 23 59 25 33 294 -9 - 1 13 20 0 50 56 - 1 39 35 1 16 54 - 80 0 0 - 0 27 32 23 59 27 32 294 -10 - 1 29 53 0 34 32 - 1 56 9 1 0 32 - 79 0 0 - 0 44 16 23 59 28 31 294 -11 - 1 46 42 0 17 52 - 2 13 0 0 43 53 - 78 0 0 - 1 1 17 23 59 30 30 294 -12 - 2 3 47 0 0 55 - 2 30 7 0 26 58 - 77 0 0 - 1 18 34 23 59 32 29 294 -14 - 2 21 8 - 0 16 17 - 2 47 30 0 9 48 - 76 0 0 - 1 36 6 23 59 33 28 294 -15 - 2 38 45 - 0 33 45 - 3 5 8 - 0 7 39 - 75 0 0 - 1 53 54 23 59 35 27 294 -16 - 2 56 36 - 0 51 29 - 3 23 2 - 0 25 20 - 74 0 0 - 2 11 56 23 59 36 26 293 -17 - 3 14 43 - 1 9 27 - 3 41 10 - 0 43 17 - 73 0 0 - 2 30 13 23 59 37 25 293 -18 - 3 33 4 - 1 27 40 - 3 59 33 - 1 1 28 - 72 0 0 - 2 48 44 23 59 39 24 293 -19 - 3 51 39 - 1 46 7 - 4 18 10 - 1 19 53 - 71 0 0 - 3 7 29 23 59 40 23 293 -20 - 4 10 28 - 2 4 47 - 4 37 1 - 1 38 32 - 70 0 0 - 3 26 27 23 59 41 22 293 -21 - 4 29 30 - 2 23 41 - 4 56 4 - 1 57 25 - 69 0 0 - 3 45 38 23 59 42 21 293 -22 - 4 48 45 - 2 42 48 - 5 15 21 - 2 16 30 - 68 0 0 - 4 5 2 23 59 43 20 293 -23 - 5 8 12 - 3 2 8 - 5 34 50 - 2 35 48 - 67 0 0 - 4 24 37 23 59 44 19 293 -24 - 5 27 52 - 3 21 40 - 5 54 31 - 2 55 18 - 66 0 0 - 4 44 25 23 59 45 18 293 -25 - 5 47 43 - 3 41 24 - 6 14 24 - 3 15 1 - 65 0 0 - 5 4 23 23 59 46 17 293 -26 - 6 7 45 - 4 1 19 - 6 34 27 - 3 34 54 - 64 0 0 - 5 24 33 23 59 47 16 292 -27 - 6 27 58 - 4 21 25 - 6 54 42 - 3 54 59 - 63 0 0 - 5 44 52 23 59 48 15 292 -28 - 6 48 21 - 4 41 41 - 7 15 7 - 4 15 13 - 62 0 0 - 6 5 22 23 59 49 14 292 -29 - 7 8 54 - 5 2 7 - 7 35 41 - 4 35 38 - 61 0 0 - 6 26 1 23 59 50 12 292 -30 - 7 29 37 - 5 22 43 - 7 56 25 - 4 56 13 - 60 0 0 - 6 46 49 23 59 50 11 292 -31 - 7 50 28 - 5 43 28 - 8 17 17 - 5 16 57 - 59 0 0 - 7 7 46 23 59 51 10 292 -32 - 8 11 27 - 6 4 22 - 8 38 18 - 5 37 49 - 58 0 0 - 7 28 50 23 59 51 9 292 -33 - 8 32 35 - 6 25 24 - 8 59 27 - 5 58 50 - 57 0 0 - 7 50 3 23 59 52 8 292 -35 - 8 53 50 - 6 46 33 - 9 20 43 - 6 19 58 - 56 0 0 - 8 11 22 23 59 52 7 291 -36 - 9 15 12 - 7 7 50 - 9 42 6 - 6 41 14 - 55 0 0 - 8 32 47 23 59 53 6 291 -37 - 9 36 40 - 7 29 13 -10 3 35 - 7 2 36 - 54 0 0 - 8 54 19 23 59 53 5 291 -38 - 9 58 14 - 7 50 42 -10 25 10 - 7 24 4 - 53 0 0 - 9 15 56 23 59 53 4 291 -39 -10 19 53 - 8 12 17 -10 46 50 - 7 45 38 - 52 0 0 - 9 37 39 23 59 54 3 291 -40 -10 41 37 - 8 33 57 -11 8 36 - 8 7 18 - 51 0 0 - 9 59 25 23 59 54 2 291 -41 -11 3 26 - 8 55 42 -11 30 25 - 8 29 2 - 50 0 0 -10 21 16 23 59 54 1 290 -42 -11 25 19 - 9 17 31 -11 52 18 - 8 50 50 Uncertainty in time = +/- 1 secs [Prediction of 2008 Mar 29.0] Data for the target star ------------------------ * name: TYC 1322-00982-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 15 07.5317 DE: +19 54 35.022 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .014, .017 ) * V mag [mag]: 10.0 * B mag [mag]: 10.0 * Apparent position with proper motion RA(deg): 93.9037138245 DE(deg): 19.9084164991 * Equation of equinoxes (radians) : 0.000041140257460 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (45) Eugenia approx. diameter [km]: 215 approx. diameter ["]: .085 distance from Earth [AU]: 3.49100 * orbital information: orbit source: Preston date of fit: 2008 Mar 28 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, 86° remarks: * orbital elements for (45) Eugenia : Mean anomaly = 241.90116408 deg Arg. of pericenter = 85.49295356 deg Long. of node = 147.92105055 deg Inclination = 6.60928113 deg Eccentricity = 0.08174807 Semimajor axis = 2.72123377 AU Perihelion dist = 2.49877815 AU Mag: H = 7.40, G = 0.07 Epoch of elements : MJD 54596.99800000 TDT (2008 May 10.998) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 10 45 Eugenia 23h 57.2m UT 10.0 6 15 7.532 19 54 35.02TYC 1322-00982-1 10.0 13.3 215 5.7 3.491 3.806 2.16 -134.6586 19.909 179.81 17.92 23.9527 0.00939 -0.23499 21.31302 0.86044 0.00382 -0.00035 2000 240.3646762008 5 4.00000 85.492954147.921051 6.6092810.08174807 2.7212338 2.4987782 7.5 5.00.07 RATE 2.1956100 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.018 0.015 360 1.21 0.018 2 13 1190 6 0 54554.5020080510_0982-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 31, 04:32 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org