IOTA/IOTA-ES occultation update for (665) Sabine / TYC 7806-02152-1 event on 2008 May 08, 03:16 UT Visible from Brazil, Colombia, Mexico, USA Summary ------- On 2008 May 08 UT, the 51 km diameter asteroid (665) Sabine will occult a 12.6 mag star in the constellation Centaurus for observers along a path across Brazil, Colombia, Mexico, USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.5 mag to 12.0 mag (the magnitude of the asteroid) for at most 5.0 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: 74 * date and approx. time of event: 2008 May 08, 02:58 - 2008 May 08, 03:17 UT * midpoint of event [JD]: 2454594.63062917 * magnitude of target star: 12.6 * magnitude drop [mag]: 0.5 * estimated maximum duration [s]: 5.0 * Moon: 11 % sunlit, 139° distance * Sun: 158° distance * rough path description: Brazil, Colombia, Mexico, USA The occultation path -------------------- * approximate projected width [km]: 58 * 1 sigma uncertainty interval [path widths]: +/- 0.77 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .041 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .041", .031", 100° ) * approx speed of asteroid's shadow [km/s]: 10.1933 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7806-02152-1 by 665 Sabine on 2008 May 8 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 -106 0 0 39 54 47 3 17 17 0 144 -13 40 21 54 39 27 52 .. .. .. 38 46 48 -105 0 0 38 50 42 3 17 17 2 145 -14 39 17 45 38 23 51 39 59 48 37 42 53 -104 0 0 37 45 57 3 17 17 3 145 -15 38 12 55 37 19 11 38 54 50 36 38 20 -103 0 0 36 40 36 3 17 15 4 146 -17 37 7 28 36 13 56 37 49 14 35 33 14 -102 0 0 35 34 45 3 17 14 6 147 -18 36 1 30 35 8 12 36 43 5 34 27 40 -101 0 0 34 28 28 3 17 12 7 147 -19 34 55 6 34 2 3 35 36 28 33 21 42 -100 0 0 33 21 51 3 17 10 8 148 -21 33 48 20 32 55 34 34 29 29 32 15 26 - 99 0 0 32 14 59 3 17 7 10 148 -22 32 41 18 31 48 50 33 22 13 31 8 56 - 98 0 0 31 7 56 3 17 4 11 149 -23 31 34 5 30 41 57 32 14 44 30 2 17 - 97 0 0 30 0 47 3 17 1 13 149 -25 30 26 46 29 34 59 31 7 9 28 55 35 - 96 0 0 28 53 39 3 16 57 14 150 -26 29 19 27 28 28 2 29 59 32 27 48 54 - 95 0 0 27 46 35 3 16 52 15 150 -28 28 12 11 27 21 9 28 51 58 26 42 18 - 94 0 0 26 39 40 3 16 47 17 151 -29 27 5 4 26 14 26 27 44 32 25 35 53 - 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Uncertainty in time = +/- 5 secs [Prediction of 2008 Apr 21.0] Data for the target star ------------------------ * name: TYC 7806-02152-1 * constellation : Centaurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 30 49.5236 DE: -38 13 50.800 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .023, .026 ) * V mag [mag]: 12.6 * B mag [mag]: 12.7 * Apparent position with proper motion RA(deg): 217.8440310194 DE(deg): -38.2714055092 * Equation of equinoxes (radians) : 0.000039418249522 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (665) Sabine approx. diameter [km]: 51 approx. diameter ["]: .041 distance from Earth [AU]: 1.71400 * orbital information: orbit source: Preston date of fit: 2008 Apr 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 742 number of rejected observations: 63 time covered by the observations: 1906 Jan 15 - 2008 Jan 26 1 sigma uncertainty ellipse (major, minor, PA): 0.034, 0.017, 105° remarks: * orbital elements for (665) Sabine : Mean anomaly = 337.56799384 deg Arg. of pericenter = 320.14554783 deg Long. of node = 298.57001248 deg Inclination = 14.75149309 deg Eccentricity = 0.16765484 Semimajor axis = 3.14725451 AU Perihelion dist = 2.61960207 AU Mag: H = 8.57, G = 0.15 Epoch of elements : MJD 54594.13700000 TDT (2008 May 08.137) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 8 665 Sabine 3h 8.1m UT 12.6 14 30 49.524-38 13 50.80TYC 7806-02152-1 12.7 12.0 51 5.0 1.714 -2.234 13.36 -55.6439 -38.234 132.10 17.17 3.1351 0.21304 0.42003 -5.13194 2.60084 0.00073 0.00199 2000 336.8377102008 5 4.00000320.145548298.570012 14.7514930.16765484 3.1472545 2.6196021 8.1 5.00.15 RATE 1.7652500 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.041 0.031 100 1.77 0.032 0 54577.5020080508_2152-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 21, 17:24 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org