IOTA/IOTA-ES occultation update for (524) Fidelio / TYC 7381-00572-1 event on 2008 Jul 03, 06:23 UT Visible from Brazil, Uruguay, Argentina, Chile Summary ------- On 2008 Jul 03 UT, the 72 km diameter asteroid (524) Fidelio will occult a 11.4 mag star in the constellation Scorpius for observers along a path across Brazil, Uruguay, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.6 mag to 13.9 mag (the magnitude of the asteroid) for at most 6.0 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: 91 * date and approx. time of event: 2008 Jul 03, 06:14 - 2008 Jul 03, 06:32 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 2.6 * estimated maximum duration [s]: 6.0 * Moon: 0 % sunlit, 162° distance * Sun: 162° distance * rough path description: Brazil, Uruguay, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 72 * 1 sigma uncertainty interval [path widths]: +/- 0.51 * 1 sigma uncertainty interval [seconds]: +/- 3.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .032 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .032", .027", 89° ) * approx speed of asteroid's shadow [km/s]: 12.0002 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7381-00572-1 by 524 Fidelio on 2008 Jul 3 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 175 0 0 3 17 11 6 32 25 13 126 -1 3 41 10 2 53 13 4 5 37 2 28 47 176 0 0 2 34 20 6 32 23 14 126 -2 2 58 19 2 10 22 3 22 46 1 45 55 177 0 0 1 51 26 6 32 20 16 126 -3 2 15 25 1 27 28 2 39 53 1 3 1 178 0 0 1 8 31 6 32 17 17 126 -4 1 32 30 0 44 33 1 56 58 0 20 7 179 0 0 0 25 38 6 32 13 18 126 -5 0 49 36 0 1 40 1 14 3 - 0 22 47 180 0 0 - 0 17 14 6 32 10 19 126 -7 0 6 44 - 0 41 11 0 31 10 - 1 5 37 -179 0 0 - 1 0 2 6 32 6 21 126 -8 - 0 36 5 - 1 23 58 - 0 11 39 - 1 48 23 -178 0 0 - 1 42 44 6 32 2 22 126 -9 - 1 18 48 - 2 6 39 - 0 54 23 - 2 31 3 -177 0 0 - 2 25 19 6 31 57 23 126 -10 - 2 1 25 - 2 49 14 - 1 37 1 - 3 13 36 -176 0 0 - 3 7 47 6 31 53 24 126 -11 - 2 43 53 - 3 31 39 - 2 19 31 - 3 56 1 -175 0 0 - 3 50 4 6 31 48 25 126 -12 - 3 26 13 - 4 13 55 - 3 1 52 - 4 38 15 -174 0 0 - 4 32 10 6 31 43 27 126 -14 - 4 8 21 - 4 56 0 - 3 44 2 - 5 20 18 -173 0 0 - 5 14 4 6 31 38 28 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52 -13 44 23 - 15 0 0 -12 18 6 6 14 58 4 236 -16 -11 54 38 -12 41 34 -11 30 41 -13 5 29 - 14 0 0 -11 38 36 6 14 57 2 236 -15 -11 15 4 -12 2 8 -10 51 3 -12 26 7 - 13 0 0 -10 58 39 6 14 57 1 236 -14 -10 35 4 -11 22 15 -10 10 59 -11 46 19 - 12 0 0 -10 18 17 6 14 57 0 236 -12 .. .. .. -10 41 56 .. .. .. -11 6 4 Uncertainty in time = +/- 4 secs [Prediction of 2008 Jun 26.0] Data for the target star ------------------------ * name: TYC 7381-00572-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 45 20.5034 DE: -33 42 38.689 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .022 ) * V mag [mag]: 11.4 * B mag [mag]: 11.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (524) Fidelio approx. diameter [km]: 72 approx. diameter ["]: .053 distance from Earth [AU]: 1.86300 * orbital information: orbit source: Preston date of fit: 2008 Jun 25 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 807 number of rejected observations: 83 time covered by the observations: 1904 Mar 15 - 2008 Jun 25 1 sigma uncertainty ellipse (major, minor, PA): 0.023, 0.015, 88° remarks: * orbital elements for (524) Fidelio : Mean anomaly = 237.00501720 deg Arg. of pericenter = 79.28186843 deg Long. of node = 326.78042454 deg Inclination = 8.22445168 deg Eccentricity = 0.12765302 Semimajor axis = 2.63703863 AU Perihelion dist = 2.30041268 AU Mag: H = 9.81, G = 0.15 Epoch of elements : MJD 54650.26700000 TDT (2008 Jul 03.267) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 3 524 Fidelio 6h 23.8m UT 11.4 17 45 20.503-33 42 38.69TYC 7381-00572-1 11.7 13.9 72 6.0 1.863 -2.499 7.05 -111.2694 -33.713 85.12 22.92 6.3967 0.00124 0.00684 -6.60695 1.49175 0.00145 0.00093 2000 236.9435642008 7 3.00000 79.281868326.780425 8.2244520.12765302 2.6370386 2.3004127 9.8 5.00.15 RATE 2.3015980 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.032 0.027 89 1.51 0.027 0 54643.5020080703_0572-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 26, 00:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org