IOTA/IOTA-ES occultation update for (889) Erynia / TYC 5836-00568-1 event on 2008 Oct 17, 01:01 UT Visible from W Africa, Brazil, Peru Summary ------- On 2008 Oct 17 UT, the 22 km diameter asteroid (889) Erynia will occult a 10.9 mag star in the constellation Aquarius for observers along a path across W Africa, Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.0 mag to 13.8 mag (the magnitude of the asteroid) for at most 5.4 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: 39 * date and approx. time of event: 2008 Oct 17, 00:37 - 2008 Oct 17, 01:23 UT * magnitude of target star: 10.9 * magnitude drop [mag]: 3.0 * estimated maximum duration [s]: 5.4 * Moon: 93 % sunlit, 66° distance * Sun: 145° distance * rough path description: W Africa, Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 1.70 * 1 sigma uncertainty interval [seconds]: +/- 8.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .043 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .043", 356° ) * approx speed of asteroid's shadow [km/s]: 4.1071 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5836-00568-1 by 889 Erynia on 2008 Oct 17 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 -112 0 0 -11 57 23 1 23 35 30 100 -1 -11 51 13 -12 3 33 -11 30 14 -12 24 29 -111 0 0 -11 58 15 1 23 21 31 100 -1 -11 52 5 -12 4 25 -11 31 6 -12 25 20 -110 0 0 -11 58 42 1 23 8 32 100 -2 -11 52 32 -12 4 51 -11 31 33 -12 25 47 -109 0 0 -11 58 43 1 22 54 33 100 -3 -11 52 33 -12 4 53 -11 31 35 -12 25 48 -108 0 0 -11 58 19 1 22 40 34 99 -4 -11 52 10 -12 4 29 -11 31 11 -12 25 24 -107 0 0 -11 57 30 1 22 25 35 99 -5 -11 51 21 -12 3 40 -11 30 22 -12 24 35 -106 0 0 -11 56 16 1 22 10 36 99 -6 -11 50 7 -12 2 26 -11 29 9 -12 23 21 -105 0 0 -11 54 38 1 21 55 37 99 -7 -11 48 28 -12 0 47 -11 27 30 -12 21 42 -104 0 0 -11 52 34 1 21 40 38 99 -8 -11 46 24 -11 58 44 -11 25 26 -12 19 39 -103 0 0 -11 50 6 1 21 24 38 99 -9 -11 43 56 -11 56 16 -11 22 58 -12 17 11 -102 0 0 -11 47 13 1 21 8 39 99 -10 -11 41 3 -11 53 23 -11 20 5 -12 14 19 -101 0 0 -11 43 56 1 20 51 40 99 -11 -11 37 46 -11 50 6 -11 16 47 -12 11 2 -100 0 0 -11 40 15 1 20 35 41 99 -11 -11 34 5 -11 46 25 -11 13 5 -12 7 21 - 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2008 Sep 22 1 sigma uncertainty ellipse (major, minor, PA): 0.038, 0.024, 77° remarks: * orbital elements for (889) Erynia : Mean anomaly = 330.46124194 deg Arg. of pericenter = 277.78494079 deg Long. of node = 132.75585224 deg Inclination = 8.09702258 deg Eccentricity = 0.20302058 Semimajor axis = 2.44679829 AU Perihelion dist = 1.95004789 AU Mag: H = 10.98, G = 0.15 Epoch of elements : MJD 54756.04300000 TDT (2008 Oct 17.043) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 17 889 Erynia 1h 2.2m UT 10.9 23 44 19.423-14 25 20.44TYC 5836-00568-1 11.4 13.8 22 5.4 1.150 -1.127 -6.75 -45.3813 -14.420 160.79 -9.32 1.0367 -0.09585 0.23194 -2.14263 -0.88485 0.00230 0.00200 2000 328.90506320081011.00000277.784941132.755852 8.0970230.20302058 2.4467983 1.950047911.1 5.00.15 RATE 2.5751760 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.044 0.043 356 2.70 0.045 0 54740.5020081017_0568-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Oct 01, 05:03 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org