IOTA/IOTA-ES occultation update for (9) Metis / TYC 1864-00336-1 event on 2012 Sep 10, 19:37 UT Visible from E Russia, China Summary ------- On 2012 Sep 10 UT, the 200 km diameter asteroid (9) Metis will occult a 10.9 mag star in the constellation Gemini for observers along a path across E Russia, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.7 mag to 10.7 mag (the magnitude of the asteroid) for at most 7.9 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: 100 * date and approx. time of event: 2012 Sep 10, 19:33 - 2012 Sep 10, 19:36 UT * geocentric midpoint of event [JD]: 2456181.3174625 * magnitude of target star: 10.9 * magnitude drop [mag]: 0.7 * estimated maximum duration [s]: 7.9 * Moon: 29 % sunlit, 13° distance * Sun: 78° distance * rough path description: E Russia, China The occultation path -------------------- * approximate projected width [km]: 253 * 1 sigma uncertainty interval [path widths]: +/- 0.14 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .021 +/- .019) * 1 sigma uncertainty ellipse (major, minor, PA): ( .021", .019", 89° ) * approx speed of asteroid's shadow [km/s]: 25.3492 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1864-00336-1 by 9 Metis on 2012 Sep 10 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 63 0 0 31 10 42 19 33 51 0 63 -54 .. .. .. 32 28 52 .. .. .. 32 51 3 64 0 0 31 37 4 19 33 51 1 64 -54 30 20 15 32 55 24 29 59 0 33 17 38 65 0 0 32 3 34 19 33 51 2 64 -53 30 46 36 33 22 4 30 25 18 33 44 20 66 0 0 32 30 11 19 33 51 3 65 -53 31 13 4 33 48 51 30 51 44 34 11 10 67 0 0 32 56 55 19 33 52 4 65 -53 31 39 39 34 15 44 31 18 17 34 38 6 68 0 0 33 23 45 19 33 52 5 66 -52 32 6 21 34 42 43 31 44 57 35 5 7 69 0 0 33 50 40 19 33 53 6 67 -52 32 33 8 35 9 46 32 11 41 35 32 13 70 0 0 34 17 39 19 33 53 7 67 -51 33 0 0 35 36 54 32 38 31 35 59 23 71 0 0 34 44 42 19 33 54 8 68 -50 33 26 55 36 4 4 33 5 24 36 26 36 72 0 0 35 11 47 19 33 55 9 68 -50 33 53 53 36 31 17 33 32 20 36 53 51 73 0 0 35 38 54 19 33 55 10 69 -49 34 20 53 36 58 31 33 59 19 37 21 6 74 0 0 36 6 2 19 33 56 11 69 -49 34 47 55 37 25 45 34 26 19 37 48 23 75 0 0 36 33 9 19 33 57 12 70 -48 35 14 57 37 52 59 34 53 19 38 15 38 76 0 0 37 0 17 19 33 58 12 71 -47 35 41 59 38 20 12 35 20 19 38 42 53 77 0 0 37 27 22 19 34 0 13 71 -47 36 8 59 38 47 22 35 47 19 39 10 5 78 0 0 37 54 25 19 34 1 14 72 -46 36 35 58 39 14 30 36 14 16 39 37 14 79 0 0 38 21 25 19 34 2 15 73 -45 37 2 53 39 41 34 36 41 11 40 4 19 80 0 0 38 48 20 19 34 3 16 73 -45 37 29 45 40 8 34 37 8 2 40 31 20 81 0 0 39 15 11 19 34 5 17 74 -44 37 56 33 40 35 28 37 34 49 40 58 15 82 0 0 39 41 56 19 34 6 18 75 -43 38 23 16 41 2 16 38 1 30 41 25 4 83 0 0 40 8 35 19 34 8 19 76 -43 38 49 52 41 28 57 38 28 6 41 51 46 84 0 0 40 35 7 19 34 10 20 76 -42 39 16 22 41 55 30 38 54 36 42 18 19 85 0 0 41 1 31 19 34 11 20 77 -41 39 42 45 42 21 55 39 20 58 42 44 45 86 0 0 41 27 46 19 34 13 21 78 -40 40 8 59 42 48 11 39 47 12 43 11 1 87 0 0 41 53 51 19 34 15 22 79 -40 40 35 5 43 14 17 40 13 18 43 37 7 88 0 0 42 19 47 19 34 17 23 79 -39 41 1 1 43 40 12 40 39 14 44 3 2 89 0 0 42 45 32 19 34 19 24 80 -38 41 26 47 44 5 56 41 5 0 44 28 45 90 0 0 43 11 5 19 34 20 24 81 -38 41 52 21 44 31 28 41 30 35 44 54 17 91 0 0 43 36 27 19 34 22 25 82 -37 42 17 45 44 56 47 41 55 59 45 19 36 92 0 0 44 1 36 19 34 25 26 83 -36 42 42 56 45 21 54 42 21 11 45 44 42 93 0 0 44 26 31 19 34 27 27 83 -35 43 7 54 45 46 47 42 46 10 46 9 34 94 0 0 44 51 13 19 34 29 28 84 -35 43 32 40 46 11 25 43 10 56 46 34 11 95 0 0 45 15 41 19 34 31 28 85 -34 43 57 11 46 35 48 43 35 28 46 58 33 96 0 0 45 39 53 19 34 33 29 86 -33 44 21 28 46 59 57 43 59 46 47 22 40 97 0 0 46 3 51 19 34 35 30 87 -32 44 45 30 47 23 49 44 23 50 47 46 31 98 0 0 46 27 32 19 34 38 30 88 -32 45 9 16 47 47 25 44 47 38 48 10 5 99 0 0 46 50 58 19 34 40 31 89 -31 45 32 47 48 10 44 45 11 10 48 33 23 100 0 0 47 14 6 19 34 42 32 90 -30 45 56 2 48 33 46 45 34 26 48 56 23 101 0 0 47 36 58 19 34 44 33 91 -29 46 19 0 48 56 31 45 57 26 49 19 6 102 0 0 47 59 32 19 34 47 33 92 -29 46 41 40 49 18 58 46 20 9 49 41 30 103 0 0 48 21 48 19 34 49 34 93 -28 47 4 4 49 41 6 46 42 34 50 3 37 104 0 0 48 43 46 19 34 52 35 94 -27 47 26 10 50 2 56 47 4 42 50 25 24 105 0 0 49 5 26 19 34 54 35 95 -26 47 47 57 50 24 28 47 26 31 50 46 53 106 0 0 49 26 47 19 34 56 36 96 -26 48 9 27 50 45 40 47 48 3 51 8 3 107 0 0 49 47 49 19 34 59 36 97 -25 48 30 37 51 6 33 48 9 16 51 28 53 108 0 0 50 8 31 19 35 1 37 98 -24 48 51 29 51 27 6 48 30 10 51 49 24 109 0 0 50 28 55 19 35 4 38 99 -24 49 12 2 51 47 20 48 50 45 52 9 35 110 0 0 50 48 59 19 35 6 38 100 -23 49 32 15 52 7 14 49 11 1 52 29 26 111 0 0 51 8 43 19 35 9 39 102 -22 49 52 9 52 26 48 49 30 58 52 48 56 112 0 0 51 28 8 19 35 11 39 103 -21 50 11 44 52 46 1 49 50 35 53 8 7 113 0 0 51 47 12 19 35 14 40 104 -21 50 30 58 53 4 55 50 9 53 53 26 58 114 0 0 52 5 56 19 35 16 40 105 -20 50 49 53 53 23 28 50 28 50 53 45 28 115 0 0 52 24 21 19 35 19 41 106 -19 51 8 28 53 41 41 50 47 28 54 3 37 116 0 0 52 42 24 19 35 21 41 107 -19 51 26 43 53 59 34 51 5 46 54 21 26 117 0 0 53 0 8 19 35 24 42 109 -18 51 44 37 54 17 6 51 23 43 54 38 55 118 0 0 53 17 31 19 35 26 42 110 -17 52 2 12 54 34 17 51 41 21 54 56 3 119 0 0 53 34 34 19 35 29 43 111 -17 52 19 26 54 51 8 51 58 38 55 12 51 120 0 0 53 51 17 19 35 31 43 112 -16 52 36 20 55 7 39 52 15 35 55 29 18 121 0 0 54 7 39 19 35 34 44 114 -15 52 52 54 55 23 49 52 32 12 55 45 25 122 0 0 54 23 41 19 35 36 44 115 -15 53 9 7 55 39 39 52 48 29 56 1 11 123 0 0 54 39 23 19 35 39 44 116 -14 53 25 1 55 55 9 53 4 25 56 16 37 124 0 0 54 54 45 19 35 41 45 118 -13 53 40 34 56 10 18 53 20 1 56 31 43 125 0 0 55 9 46 19 35 44 45 119 -13 53 55 47 56 25 7 53 35 17 56 46 29 126 0 0 55 24 28 19 35 46 46 120 -12 54 10 40 56 39 36 53 50 13 57 0 54 127 0 0 55 38 49 19 35 49 46 122 -12 54 25 12 56 53 45 54 4 49 57 15 0 128 0 0 55 52 50 19 35 51 46 123 -11 54 39 25 57 7 35 54 19 5 57 28 45 129 0 0 56 6 32 19 35 54 47 124 -10 54 53 18 57 21 4 54 33 2 57 42 11 130 0 0 56 19 53 19 35 56 47 126 -10 55 6 52 57 34 14 54 46 38 57 55 17 131 0 0 56 32 55 19 35 59 47 127 -9 55 20 5 57 47 4 54 59 54 58 8 4 132 0 0 56 45 38 19 36 1 48 129 -9 55 32 59 57 59 34 55 12 51 58 20 31 133 0 0 56 58 1 19 36 4 48 130 -8 55 45 33 58 11 45 55 25 29 58 32 39 134 0 0 57 10 5 19 36 6 48 131 -7 55 57 48 58 23 38 55 37 47 58 44 28 135 0 0 57 21 49 19 36 8 49 133 -7 56 9 44 58 35 11 55 49 45 58 55 57 136 0 0 57 33 15 19 36 11 49 134 -6 56 21 20 58 46 25 56 1 25 59 7 8 137 0 0 57 44 22 19 36 13 49 136 -6 56 32 38 58 57 20 56 12 45 59 18 0 138 0 0 57 55 9 19 36 16 49 137 -5 56 43 36 59 7 57 56 23 46 59 28 34 139 0 0 58 5 39 19 36 18 50 139 -5 56 54 16 59 18 15 56 34 29 59 38 49 140 0 0 58 15 49 19 36 20 50 140 -4 57 4 37 59 28 15 56 44 53 59 48 45 141 0 0 58 25 41 19 36 23 50 142 -3 57 14 39 59 37 56 56 54 58 59 58 24 142 0 0 58 35 15 19 36 25 50 143 -3 57 24 23 59 47 20 57 4 44 60 7 45 143 0 0 58 44 31 19 36 28 50 144 -2 57 33 48 59 56 26 57 14 12 60 16 47 144 0 0 58 53 29 19 36 30 50 146 -2 57 42 56 60 5 14 57 23 22 60 25 32 145 0 0 59 2 9 19 36 32 51 147 -1 57 51 45 60 13 44 57 32 14 60 34 0 146 0 0 59 10 31 19 36 35 51 149 -1 58 0 16 60 21 56 57 40 48 60 42 10 147 0 0 59 18 36 19 36 37 51 150 0 58 8 29 60 29 52 57 49 3 60 50 2 Uncertainty in time = +/- 1 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: TYC 1864-00336-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 03 02.2906 DE: +22 49 30.486 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .018 ) * V mag [mag]: 10.9 * B mag [mag]: 11.2 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (9) Metis approx. diameter [km]: 200 approx. diameter ["]: .133 distance from Earth [AU]: 2.07000 * orbital information: orbit source: Preston date of fit: 2012 Jul 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1899 number of rejected observations: 186 time covered by the observations: 1903 Mar 22 - 2011 Nov 04 1 sigma uncertainty ellipse (major, minor, PA): 0.010, 0.006, 84° remarks: * orbital elements for (9) Metis : Mean anomaly = 350.54081562 deg Arg. of pericenter = 5.97016789 deg Long. of node = 68.94645743 deg Inclination = 5.57556068 deg Eccentricity = 0.12300702 Semimajor axis = 2.38692544 AU Perihelion dist = 2.09331686 AU Mag: H = 6.23, G = 0.17 Epoch of elements : MJD 56180.81800000 TDT (2012 Sep 10.818) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 10 9 Metis 19h 37.1m UT 10.9 6 3 2.291 22 49 30.49TYC 1864-00336-1 11.2 10.7 200 7.9 2.070 4.386 4.24 166.2338 22.825 -115.11 4.55 19.6191 -0.04482 0.61110 14.27297 0.99801 -0.00517 0.00002 2000 350.3221912012 910.00000 5.970168 68.946457 5.5755610.12300702 2.3869254 2.0933169 6.3 5.00.17 RATE 2.6726730 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.021 0.019 89 1.14 0.019 0 0-4-4 056129.0020120910_0336-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 15:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org