IOTA/IOTA-ES occultation update for (7) Iris / TYC 6125-00882-1 event on 2008 Mar 07, 02:48 UT Visible from Uruguay, Argentina, Chile Summary ------- On 2008 Mar 07 UT, the 200 km diameter asteroid (7) Iris will occult a 9.4 mag star in the constellation Virgo for observers along a path across Uruguay, Argentina, Chile. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.1 mag to 10.0 mag (the magnitude of the asteroid) for at most 25.3 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: 100 * date and approx. time of event: 2008 Mar 07, 02:40 - 2008 Mar 07, 03:00 UT * magnitude of target star: 9.4 * magnitude drop [mag]: 1.1 * estimated maximum duration [s]: 25.3 * Moon: 0 % sunlit, 132° distance * Sun: 139° distance * rough path description: Uruguay, Argentina, Chile The occultation path -------------------- * approximate projected width [km]: 230 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .020 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .020", .020", 3° ) * approx speed of asteroid's shadow [km/s]: 7.8935 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6125-00882-1 by 7 Iris on 2008 Mar 7 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 -103 0 0 -16 27 50 3 0 23 0 108 -26 .. .. .. -17 33 5 .. .. .. -17 51 30 -102 0 0 -16 46 37 3 0 22 1 107 -27 -15 41 58 -17 51 58 -15 23 59 -18 10 24 -101 0 0 -17 5 40 3 0 22 2 107 -28 -16 0 56 -18 11 6 -15 42 55 -18 29 34 -100 0 0 -17 24 58 3 0 21 3 107 -29 -16 20 8 -18 30 29 -16 2 6 -18 48 58 - 99 0 0 -17 44 30 3 0 20 4 107 -30 -16 39 35 -18 50 7 -16 21 32 -19 8 38 - 98 0 0 -18 4 17 3 0 19 5 106 -30 -16 59 17 -19 9 59 -16 41 12 -19 28 32 - 97 0 0 -18 24 17 3 0 17 6 106 -31 -17 19 12 -19 30 5 -17 1 6 -19 48 39 - 96 0 0 -18 44 30 3 0 15 7 106 -32 -17 39 20 -19 50 24 -17 21 13 -20 8 59 - 95 0 0 -19 4 56 3 0 13 8 105 -33 -17 59 41 -20 10 55 -17 41 32 -20 29 32 - 94 0 0 -19 25 35 3 0 11 9 105 -34 -18 20 14 -20 31 38 -18 2 4 -20 50 16 - 93 0 0 -19 46 24 3 0 8 10 105 -34 -18 40 59 -20 52 33 -18 22 48 -21 11 13 - 92 0 0 -20 7 25 3 0 5 11 104 -35 -19 1 55 -21 13 39 -18 43 42 -21 32 20 - 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2008 Feb 18 1 sigma uncertainty ellipse (major, minor, PA): 0.010, 0.009, 106° remarks: * orbital elements for (7) Iris : Mean anomaly = 132.26788880 deg Arg. of pericenter = 145.33765551 deg Long. of node = 259.71989991 deg Inclination = 5.52743864 deg Eccentricity = 0.23145806 Semimajor axis = 2.38490535 AU Perihelion dist = 1.83289977 AU Mag: H = 5.46, G = 0.15 Epoch of elements : MJD 54532.11700000 TDT (2008 Mar 07.117) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 7 7 Iris 2h 48.6m UT 9.4 13 28 35.836-17 0 34.32TYC 6125-00882-1 9.7 10.0 200 25.3 1.983 -1.347 4.23 -5.2110 -17.011 140.60 -5.17 2.8107 -0.10417 -0.47962 -4.35262 0.95093 -0.00330 0.00193 2000 131.7013652008 3 5.00000145.337656259.719900 5.5274390.23145806 2.3849054 1.8328998 5.5 5.00.15 RATE 2.6760690 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.020 0.020 3 1.14 0.020 0 54523.5020080307_0882-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 27, 19:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org