IOTA/IOTA-ES occultation update for (554) Peraga / TYC 5538-00714-1 event on 2008 Apr 01, 21:17 UT Visible from S Africa Summary ------- On 2008 Apr 01 UT, the 96 km diameter asteroid (554) Peraga will occult a 10.6 mag star in the constellation Virgo for observers along a path across S Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 12.3 mag (the magnitude of the asteroid) for at most 7.9 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: 98 * date and approx. time of event: 2008 Apr 01, 21:09 - 2008 Apr 01, 21:25 UT * magnitude of target star: 10.6 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 7.9 * Moon: 22 % sunlit, 122° distance * Sun: 175° distance * rough path description: S Africa The occultation path -------------------- * approximate projected width [km]: 101 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 2.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .029) * 1 sigma uncertainty ellipse (major, minor, PA): ( .029", .027", 4° ) * approx speed of asteroid's shadow [km/s]: 12.2090 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5538-00714-1 by 554 Peraga on 2008 Apr 1 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 - 49 0 0 3 9 2 21 25 56 1 100 -1 3 36 53 2 41 6 3 55 46 2 22 4 - 48 0 0 2 57 41 21 25 56 2 100 -2 3 25 34 2 29 44 3 44 29 2 10 41 - 47 0 0 2 45 56 21 25 55 3 100 -3 3 13 51 2 17 56 3 32 47 1 58 51 - 46 0 0 2 33 45 21 25 55 4 100 -4 3 1 42 2 5 43 3 20 40 1 46 37 - 45 0 0 2 21 9 21 25 54 5 100 -5 2 49 8 1 53 5 3 8 8 1 33 57 - 44 0 0 2 8 8 21 25 53 6 100 -6 2 36 10 1 40 2 2 55 11 1 20 53 - 43 0 0 1 54 43 21 25 52 7 100 -7 2 22 47 1 26 35 2 41 49 1 7 24 - 42 0 0 1 40 53 21 25 51 8 100 -8 2 9 0 1 12 42 2 28 4 0 53 30 - 41 0 0 1 26 39 21 25 49 9 100 -9 1 54 48 0 58 26 2 13 54 0 39 12 - 40 0 0 1 12 1 21 25 48 10 100 -10 1 40 12 0 43 45 1 59 20 0 24 30 - 39 0 0 0 56 59 21 25 46 11 100 -11 1 25 13 0 28 41 1 44 22 0 9 24 - 38 0 0 0 41 34 21 25 44 12 100 -12 1 9 50 0 13 13 1 29 1 - 0 6 6 - 37 0 0 0 25 45 21 25 42 13 100 -13 0 54 4 - 0 2 38 1 13 17 - 0 21 59 - 36 0 0 0 9 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-40 28 18 -41 24 4 -40 9 24 -41 43 6 Uncertainty in time = +/- 3 secs [Prediction of 2008 Mar 28.0] Data for the target star ------------------------ * name: TYC 5538-00714-1 * constellation : Virgo * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 12 46 04.4608 DE: -10 02 50.081 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .026 ) * V mag [mag]: 10.6 * B mag [mag]: 11.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (554) Peraga approx. diameter [km]: 96 approx. diameter ["]: .084 distance from Earth [AU]: 1.58000 * orbital information: orbit source: Preston date of fit: 2008 Mar 27 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 838 number of rejected observations: 157 time covered by the observations: 1900 Oct 01 - 2008 Mar 25 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.013, 113° remarks: * orbital elements for (554) Peraga : Mean anomaly = 116.45047053 deg Arg. of pericenter = 127.29721026 deg Long. of node = 295.54220827 deg Inclination = 2.93944391 deg Eccentricity = 0.15429653 Semimajor axis = 2.37387373 AU Perihelion dist = 2.00759326 AU Mag: H = 8.91, G = 0.15 Epoch of elements : MJD 54557.88700000 TDT (2008 Apr 01.887) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Apr 1 554 Peraga 21h 17.7m UT 10.6 12 46 4.461-10 2 50.08TYC 5538-00714-1 11.2 12.3 96 7.9 1.580 -2.407 14.35 41.4977 -10.052 -138.50 4.95 21.2947 -0.11955 -0.29637 -6.39042 2.57873 -0.00004 0.00052 2000 114.3251262008 325.00000127.297210295.542208 2.9394440.15429653 2.3738737 2.0075933 9.0 5.00.15 RATE 2.6947450 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.029 0.027 4 1.34 0.029 0 54553.5020080401_0714-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 28, 06:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org