IOTA/IOTA-ES occultation update for (2543) Machado / TYC 5270-02033-1 event on 2008 Oct 15, 19:10 UT Visible from Australia, Africa Summary ------- On 2008 Oct 15 UT, the 21 km diameter asteroid (2543) Machado will occult a 11.1 mag star in the constellation Cetus for observers along a path across Australia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.1 mag to 14.1 mag (the magnitude of the asteroid) for at most 2.1 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: 26 * date and approx. time of event: 2008 Oct 15, 18:59 - 2008 Oct 15, 19:20 UT * magnitude of target star: 11.1 * magnitude drop [mag]: 3.1 * estimated maximum duration [s]: 2.1 * Moon: 99 % sunlit, 32° distance * Sun: 161° distance * rough path description: Australia, Africa The occultation path -------------------- * approximate projected width [km]: 21 * 1 sigma uncertainty interval [path widths]: +/- 2.61 * 1 sigma uncertainty interval [seconds]: +/- 5.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .056 +/- .054) * 1 sigma uncertainty ellipse (major, minor, PA): ( .057", .053", 64° ) * approx speed of asteroid's shadow [km/s]: 10.0273 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5270-02033-1 by 2543 Machado on 2008 Oct 15 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 - 26 0 0 16 56 43 19 20 44 4 99 0 17 2 29 16 50 57 17 32 37 16 20 50 - 25 0 0 16 47 10 19 20 44 5 100 -1 16 52 56 16 41 23 17 23 6 16 11 15 - 24 0 0 16 37 20 19 20 43 6 100 -2 16 43 7 16 31 33 17 13 18 16 1 24 - 23 0 0 16 27 14 19 20 41 7 100 -3 16 33 1 16 21 27 17 3 13 15 51 16 - 22 0 0 16 16 52 19 20 40 8 101 -4 16 22 40 16 11 5 16 52 53 15 40 52 - 21 0 0 16 6 14 19 20 38 9 101 -5 16 12 2 16 0 27 16 42 17 15 30 12 - 20 0 0 15 55 20 19 20 36 10 101 -6 16 1 8 15 49 32 16 31 25 15 19 17 - 19 0 0 15 44 11 19 20 34 11 101 -7 15 49 59 15 38 23 16 20 17 15 8 6 - 18 0 0 15 32 46 19 20 32 12 102 -8 15 38 34 15 26 58 16 8 54 14 56 39 - 17 0 0 15 21 6 19 20 30 13 102 -9 15 26 55 15 15 17 15 57 15 14 44 57 - 16 0 0 15 9 11 19 20 27 14 102 -10 15 15 0 15 3 22 15 45 22 14 33 0 - 15 0 0 14 57 0 19 20 25 15 102 -11 15 2 50 14 51 11 15 33 13 14 20 48 - 14 0 0 14 44 35 19 20 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25 -16 0 47 152 0 0 -15 17 50 18 59 35 2 263 -7 -15 12 6 -15 23 35 -14 42 7 -15 53 33 153 0 0 -15 10 16 18 59 35 1 262 -6 -15 4 31 -15 16 1 -14 34 32 -15 46 0 154 0 0 -15 2 24 18 59 35 0 262 -5 -14 56 39 -15 8 9 -14 26 38 -15 38 9 Uncertainty in time = +/- 6 secs [Prediction of 2008 Oct 1.0] Data for the target star ------------------------ * name: TYC 5270-02033-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 00 47 32.6316 DE: -07 45 27.646 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .033 ) * V mag [mag]: 11.1 * B mag [mag]: 11.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2543) Machado approx. diameter [km]: 21 approx. diameter ["]: .021 distance from Earth [AU]: 1.38900 * orbital information: orbit source: Preston date of fit: 2008 Sep 30 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 625 number of rejected observations: 9 time covered by the observations: 1943 Oct 29 - 2008 Sep 16 1 sigma uncertainty ellipse (major, minor, PA): 0.052, 0.042, 58° remarks: * orbital elements for (2543) Machado : Mean anomaly = 25.58990530 deg Arg. of pericenter = 285.95973294 deg Long. of node = 41.07745664 deg Inclination = 15.04379923 deg Eccentricity = 0.29011073 Semimajor axis = 3.08735018 AU Perihelion dist = 2.19167677 AU Mag: H = 10.98, G = 0.15 Epoch of elements : MJD 54754.79900000 TDT (2008 Oct 15.799) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 15 2543 Machado 19h 10.2m UT 11.1 0 47 32.632- 7 45 27.65TYC 5270-02033-1 11.4 14.1 21 2.1 1.389 -2.312 10.08 59.6557 -7.760 -111.14 -8.87 19.1696 0.00639 0.02201 -5.43128 1.59164 0.00086 0.00157 2000 24.71798620081011.00000285.959733 41.077457 15.0437990.29011073 3.0873502 2.191676811.0 5.00.15 RATE 1.8168760 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.057 0.053 64 3.61 0.054 0 54740.5020081015_2033-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 04:59 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org