IOTA/IOTA-ES occultation update for (886) Washingtonia / TYC 0047-00725-1 event on 2007 Aug 02, 06:42 UT Visible from Argentina, Chile Summary ------- On 2007 Aug 02 UT, the 90 km diameter asteroid (886) Washingtonia will occult a 9.2 mag star in the constellation Cetus for observers along a path across Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.2 mag to 13.4 mag (the magnitude of the asteroid) for at most 4.9 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: 96 * date and approx. time of event: 2007 Aug 02, 06:37 - 2007 Aug 02, 06:47 UT * midpoint of event [JD]: 2454314.77942083 * magnitude of target star: 9.2 * magnitude drop [mag]: 4.2 * estimated maximum duration [s]: 4.9 * Moon: 87 % sunlit, 51° distance * Sun: 89° distance * rough path description: Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 101 * 1 sigma uncertainty interval [path widths]: +/- 0.42 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .038", .023", 61° ) * approx speed of asteroid's shadow [km/s]: 18.5284 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0047-00725-1 by 886 Washingtonia on 2007 Aug 02 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 - 95 0 0 -43 51 34 6 37 15 0 87 -64 -44 18 54 -43 24 20 -44 41 57 .. .. .. - 94 0 0 -43 48 59 6 37 15 1 86 -64 -44 16 20 -43 21 45 -44 39 24 .. .. .. - 93 0 0 -43 46 10 6 37 15 2 85 -64 -44 13 31 -43 18 55 -44 36 36 .. .. .. - 92 0 0 -43 43 5 6 37 15 2 85 -64 -44 10 28 -43 15 50 -44 33 32 -42 53 1 - 91 0 0 -43 39 46 6 37 15 3 84 -64 -44 7 9 -43 12 30 -44 30 14 -42 49 40 - 90 0 0 -43 36 11 6 37 16 4 83 -63 -44 3 35 -43 8 54 -44 26 41 -42 46 4 - 89 0 0 -43 32 22 6 37 16 5 83 -63 -43 59 46 -43 5 4 -44 22 52 -42 42 13 - 88 0 0 -43 28 17 6 37 16 5 82 -63 -43 55 42 -43 0 59 -44 18 49 -42 38 7 - 87 0 0 -43 23 57 6 37 17 6 81 -63 -43 51 23 -42 56 38 -44 14 31 -42 33 46 - 86 0 0 -43 19 23 6 37 17 7 80 -63 -43 46 49 -42 52 2 -44 9 58 -42 29 9 - 85 0 0 -43 14 33 6 37 18 8 80 -62 -43 42 0 -42 47 11 -44 5 10 -42 24 18 - 84 0 0 -43 9 27 6 37 19 8 79 -62 -43 36 56 -42 42 5 -44 0 7 -42 19 11 - 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Data for the target star ------------------------ * name: TYC 0047-00725-1 * constellation : Cetus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 02 48 43.5366 DE: +02 12 26.507 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .018, .020 ) * V mag [mag]: 9.2 * B mag [mag]: 10.1 * Apparent position with proper motion RA(deg): 42.2810716993 DE(deg): 2.2420425338 * Equation of equinoxes (radians) : 0.000033035406458 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (886) Washingtonia approx. diameter [km]: 90 approx. diameter ["]: .058 distance from Earth [AU]: 2.14000 * orbital information: orbit source: Preston date of fit: 2007 Apr 24 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 528 number of rejected observations: 59 time covered by the observations: 1910 Jun 03 - 2006 Jun 21 1 sigma uncertainty ellipse (major, minor, PA): 0.034, 0.013, 54° remarks: * orbital elements for (886) Washingtonia : Mean anomaly = 7.31729816 deg Arg. of pericenter = 300.41974082 deg Long. of node = 59.63570203 deg Inclination = 16.83379713 deg Eccentricity = 0.26332273 Semimajor axis = 3.17829810 AU Perihelion dist = 2.34137995 AU Mag: H = 9.20, G = 0.15 Epoch of elements : MJD 54314.28000000 TDT (2007 Aug 02.280) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Aug 02 886 Washingtonia 6h 42.4m UT 9.2 2 48 43.537 2 12 26.51TYC 0047-00725-1 10.1 13.4 90 4.9 2.140 2.742 12.55 -8.897 2.203 80.99 17.84 6.7061 .13224 -.42935 10.00198 3.05444 -0.00509 -0.00165 2000 6.572813082007 729.00000300.419741 59.635702 16.8337970.263322733.178298102.341379958.7 5 0.15 RATE 1.7394508 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.038 0.023 61.5 1.420 0.024 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jul 09, 00:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org