IOTA/IOTA-ES occultation update for (9) Metis / UCAC2 34040192 event on 2008 Jul 04, 07:28 UT Visible from SE USA Summary ------- On 2008 Jul 04 UT, the 200 km diameter asteroid (9) Metis will occult a 11.3 mag star in the constellation Pisces for observers along a path across SE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.6 mag to 11.0 mag (the magnitude of the asteroid) for at most 7.3 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: 99 * date and approx. time of event: 2008 Jul 04, 07:25 - 2008 Jul 04, 07:27 UT * midpoint of event [JD]: 2454651.81146667 * magnitude of target star: 11.3 * magnitude drop [mag]: 0.6 * estimated maximum duration [s]: 7.3 * Moon: 2 % sunlit, 90° distance * Sun: 73° distance * rough path description: SE USA The occultation path -------------------- * approximate projected width [km]: 300 * 1 sigma uncertainty interval [path widths]: +/- 0.27 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .034 +/- .031) * 1 sigma uncertainty ellipse (major, minor, PA): ( .034", .031", 88° ) * approx speed of asteroid's shadow [km/s]: 27.5705 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 34040192 by 9 Metis on 2008 Jul 4 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 - 98 0 0 29 29 45 7 25 56 1 83 -36 28 8 24 30 53 19 .. .. .. 31 39 28 - 97 0 0 29 37 26 7 25 56 2 83 -36 28 15 59 31 1 8 .. .. .. 31 47 20 - 96 0 0 29 45 34 7 25 57 2 84 -36 28 24 1 31 9 23 .. .. .. 31 55 40 - 95 0 0 29 54 10 7 25 57 3 84 -35 28 32 29 31 18 7 27 49 14 32 4 28 - 94 0 0 30 3 13 7 25 57 4 85 -35 28 41 24 31 27 18 27 58 6 32 13 44 - 93 0 0 30 12 43 7 25 58 5 85 -35 28 50 46 31 36 56 28 7 24 32 23 27 - 92 0 0 30 22 39 7 25 58 6 86 -34 29 0 35 31 47 1 28 17 8 32 33 38 - 91 0 0 30 33 2 7 25 59 7 86 -34 29 10 49 31 57 34 28 27 18 32 44 15 - 90 0 0 30 43 52 7 26 0 8 87 -33 29 21 30 32 8 33 28 37 55 32 55 20 - 89 0 0 30 55 8 7 26 0 9 87 -33 29 32 37 32 19 58 28 48 56 33 6 51 - 88 0 0 31 6 49 7 26 1 9 88 -32 29 44 9 32 31 50 29 0 24 33 18 49 - 87 0 0 31 18 57 7 26 2 10 88 -32 29 56 7 32 44 9 29 12 17 33 31 14 - 86 0 0 31 31 30 7 26 3 11 89 -31 30 8 30 32 56 53 29 24 35 33 44 4 - 85 0 0 31 44 28 7 26 4 12 90 -30 30 21 18 33 10 2 29 37 18 33 57 20 - 84 0 0 31 57 52 7 26 5 13 90 -30 30 34 31 33 23 37 29 50 25 34 11 2 - 83 0 0 32 11 40 7 26 7 14 91 -29 30 48 8 33 37 37 30 3 57 34 25 9 - 82 0 0 32 25 53 7 26 8 15 91 -29 31 2 10 33 52 2 30 17 53 34 39 40 - 81 0 0 32 40 30 7 26 9 15 92 -28 31 16 35 34 6 51 30 32 13 34 54 37 - 80 0 0 32 55 30 7 26 11 16 93 -27 31 31 24 34 22 5 30 46 56 35 9 58 - 79 0 0 33 10 55 7 26 12 17 93 -27 31 46 37 34 37 42 31 2 2 35 25 42 - 78 0 0 33 26 42 7 26 14 18 94 -26 32 2 12 34 53 43 31 17 31 35 41 51 - 77 0 0 33 42 52 7 26 16 19 94 -25 32 18 10 35 10 6 31 33 23 35 58 22 - 76 0 0 33 59 25 7 26 17 20 95 -25 32 34 30 35 26 53 31 49 37 36 15 16 - 75 0 0 34 16 20 7 26 19 20 96 -24 32 51 12 35 44 1 32 6 13 36 32 33 - 74 0 0 34 33 36 7 26 21 21 97 -23 33 8 16 36 1 32 32 23 10 36 50 12 - 73 0 0 34 51 14 7 26 23 22 97 -22 33 25 40 36 19 23 32 40 28 37 8 12 - 72 0 0 35 9 12 7 26 25 23 98 -22 33 43 25 36 37 36 32 58 6 37 26 33 - 71 0 0 35 27 30 7 26 27 24 99 -21 34 1 31 36 56 9 33 16 5 37 45 14 - 70 0 0 35 46 9 7 26 29 24 100 -20 34 19 56 37 15 2 33 34 23 38 4 16 - 69 0 0 36 5 7 7 26 32 25 100 -19 34 38 40 37 34 15 33 53 0 38 23 37 - 68 0 0 36 24 23 7 26 34 26 101 -19 34 57 43 37 53 46 34 11 56 38 43 17 - 67 0 0 36 43 58 7 26 36 26 102 -18 35 17 4 38 13 36 34 31 10 39 3 16 - 66 0 0 37 3 50 7 26 39 27 103 -17 35 36 43 38 33 44 34 50 42 39 23 32 - 65 0 0 37 24 0 7 26 41 28 104 -16 35 56 39 38 54 9 35 10 31 39 44 6 - 64 0 0 37 44 27 7 26 44 29 105 -15 36 16 51 39 14 50 35 30 37 40 4 56 - 63 0 0 38 5 9 7 26 46 29 106 -15 36 37 20 39 35 48 35 50 59 40 26 2 - 62 0 0 38 26 7 7 26 49 30 106 -14 36 58 4 39 57 0 36 11 36 40 47 24 - 61 0 0 38 47 19 7 26 51 31 107 -13 37 19 3 40 18 28 36 32 28 41 9 1 - 60 0 0 39 8 46 7 26 54 31 108 -12 37 40 16 40 40 10 36 53 34 41 30 51 - 59 0 0 39 30 26 7 26 57 32 109 -11 38 1 42 41 2 5 37 14 53 41 52 55 - 58 0 0 39 52 19 7 27 0 32 110 -11 38 23 22 41 24 13 37 36 26 42 15 12 - 57 0 0 40 14 24 7 27 2 33 111 -10 38 45 14 41 46 33 37 58 11 42 37 40 - 56 0 0 40 36 41 7 27 5 34 113 -9 39 7 17 42 9 4 38 20 8 43 0 20 - 55 0 0 40 59 9 7 27 8 34 114 -8 39 29 32 42 31 46 38 42 16 43 23 11 - 54 0 0 41 21 46 7 27 11 35 115 -7 39 51 56 42 54 38 39 4 34 43 46 11 - 53 0 0 41 44 33 7 27 14 35 116 -6 40 14 31 43 17 39 39 27 2 44 9 20 - 52 0 0 42 7 29 7 27 17 36 117 -6 40 37 14 43 40 48 39 49 39 44 32 37 - 51 0 0 42 30 32 7 27 20 36 118 -5 41 0 5 44 4 5 40 12 24 44 56 2 - 50 0 0 42 53 43 7 27 23 37 119 -4 41 23 4 44 27 29 40 35 17 45 19 34 - 49 0 0 43 17 0 7 27 26 37 121 -3 41 46 9 44 50 59 40 58 16 45 43 11 - 48 0 0 43 40 23 7 27 29 38 122 -2 42 9 20 45 14 34 41 21 22 46 6 54 - 47 0 0 44 3 50 7 27 32 38 123 -1 42 32 37 45 38 14 41 44 33 46 30 41 - 46 0 0 44 27 22 7 27 35 38 124 -1 42 55 58 46 1 58 42 7 48 46 54 31 Uncertainty in time = +/- 2 secs [Prediction of 2008 May 26.0] Data for the target star ------------------------ * name: UCAC2 34040192 * constellation : Pisces * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 01 56 02.2696 DE: +06 38 08.545 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .033, .031 ) * V mag [mag]: 11.3 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 29.1222823702 DE(deg): 6.6789666772 * Equation of equinoxes (radians) : 0.000051536255471 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (9) Metis approx. diameter [km]: 200 approx. diameter ["]: .118 distance from Earth [AU]: 2.33600 * orbital information: orbit source: Preston date of fit: 2008 May 22 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1738 number of rejected observations: 185 time covered by the observations: 1903 Mar 22 - 2007 Aug 25 1 sigma uncertainty ellipse (major, minor, PA): 0.011, 0.006, 65° remarks: * orbital elements for (9) Metis : Mean anomaly = 301.20728679 deg Arg. of pericenter = 6.32820572 deg Long. of node = 68.96071877 deg Inclination = 5.57486563 deg Eccentricity = 0.12188256 Semimajor axis = 2.38597188 AU Perihelion dist = 2.09516352 AU Mag: H = 6.22, G = 0.17 Epoch of elements : MJD 54651.31100000 TDT (2008 Jul 04.311) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jul 4 9 Metis 7h 28.5m UT 11.3 1 56 2.270 6 38 8.55UCAC2 34040192 0.0 11.0 200 7.3 2.336 3.724 18.83 -5.8029 6.631 68.99 22.83 7.4752 -0.23820 0.70578 14.73591 5.00149 -0.00474 -0.00191 2000 300.8566902008 7 3.00000 6.328206 68.960719 5.5748660.12188256 2.3859719 2.0951635 6.3 5.00.17 RATE 2.6742750 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.034 0.031 88 1.27 0.031 0 54612.5020080704_040192 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 26, 16:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org