IOTA/IOTA-ES occultation update for (576) Emanuela / TYC 6114-00423-1 event on 2007 Jul 03, 08:09 UT Visible from E Australia Summary ------- On 2007 Jul 03 UT, the 85 km diameter asteroid (576) Emanuela will occult a 11.3 mag star in the constellation Corvus for observers along a path across E Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.8 mag to 15.0 mag (the magnitude of the asteroid) for at most 7.4 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: 72 * date and approx. time of event: 2007 Jul 03, 08:00 - 2007 Jul 03, 08:18 UT * magnitude of target star: 11.3 * magnitude drop [mag]: 3.8 * estimated maximum duration [s]: 7.4 * Moon: 92 % sunlit, 114° distance * Sun: 98° distance * rough path description: E Australia The occultation path -------------------- * approximate projected width [km]: 86 * 1 sigma uncertainty interval [path widths]: +/- 0.81 * 1 sigma uncertainty interval [seconds]: +/- 5.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .035", .035", 4° ) * approx speed of asteroid's shadow [km/s]: 11.4337 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6114-00423-1 by 576 Emanuela on 2007 Jul 03 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 59 0 0 .. .. .. .. .. .. .. .. .. -10 12 43 .. .. .. -10 52 32 .. .. .. 60 0 0 -10 7 45 8 0 14 1 108 57 -10 32 18 - 9 43 14 -11 12 7 - 9 3 34 61 0 0 -10 27 17 8 0 14 2 108 57 -10 51 50 -10 2 46 -11 31 38 - 9 23 7 62 0 0 -10 46 46 8 0 15 3 108 56 -11 11 18 -10 22 16 -11 51 7 - 9 42 37 63 0 0 -11 6 12 8 0 15 4 108 56 -11 30 43 -10 41 41 -12 10 31 -10 2 3 64 0 0 -11 25 33 8 0 16 5 107 56 -11 50 4 -11 1 3 -12 29 51 -10 21 25 65 0 0 -11 44 49 8 0 17 6 107 55 -12 9 20 -11 20 20 -12 49 7 -10 40 43 66 0 0 -12 4 1 8 0 18 7 107 55 -12 28 32 -11 39 32 -13 8 17 -10 59 56 67 0 0 -12 23 7 8 0 20 8 107 54 -12 47 37 -11 58 39 -13 27 22 -11 19 4 68 0 0 -12 42 8 8 0 21 9 106 54 -13 6 37 -12 17 40 -13 46 21 -11 38 6 69 0 0 -13 1 2 8 0 23 10 106 53 -13 25 31 -12 36 35 -14 5 13 -11 57 2 70 0 0 -13 19 50 8 0 25 11 106 53 -13 44 17 -12 55 23 -14 23 59 -12 15 51 71 0 0 -13 38 30 8 0 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Data for the target star ------------------------ * name: TYC 6114-00423-1 * constellation : Corvus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 52 51.7145 DE: -17 54 53.288 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .030, .033 ) * V mag [mag]: 11.3 * B mag [mag]: 13.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (576) Emanuela approx. diameter [km]: 85 approx. diameter ["]: .043 distance from Earth [AU]: 2.73800 * orbital information: orbit source: Preston date of fit: 2007 Jun 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 761 number of rejected observations: 63 time covered by the observations: 1924 Mar 08 - 2007 May 31 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.013, 117° remarks: * orbital elements for (576) Emanuela : Mean anomaly = 274.66418855 deg Arg. of pericenter = 26.45075741 deg Long. of node = 300.01593293 deg Inclination = 10.22902832 deg Eccentricity = 0.19841946 Semimajor axis = 2.98342592 AU Perihelion dist = 2.39145617 AU Mag: H = 9.20, G = 0.15 Epoch of elements : MJD 54284.34000000 TDT (2007 Jul 03.340) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 03 576 Emanuela 8h 9.4m UT 11.3 12 52 51.715-17 54 53.29TYC 6114-00423-1 13.1 15.0 85 7.4 2.738 1.451 0.96 149.880 -17.915 58.68 22.98 8.1573 .00541 -.13188 6.44639 0.30230 0.00514 -0.00203 2000 273.8341072007 629.00000 26.450757300.015933 10.2290280.198419462.983425922.391456179.4 5 0.15 RATE 1.9126310 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.035 0.035 3.6 1.810 0.035 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 29, 02:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org