IOTA/IOTA-ES occultation update for (9) Metis / TYC 1863-02249-1 event on 2012 Sep 08, 06:29 UT Visible from Brazil Summary ------- On 2012 Sep 08 UT, the 200 km diameter asteroid (9) Metis will occult a 11.6 mag star in the constellation Orion for observers along a path across Brazil. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.4 mag to 10.7 mag (the magnitude of the asteroid) for at most 7.7 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 08, 06:25 - 2012 Sep 08, 06:27 UT * geocentric midpoint of event [JD]: 2456178.7698125 * magnitude of target star: 11.6 * magnitude drop [mag]: 0.4 * estimated maximum duration [s]: 7.7 * Moon: 53 % sunlit, 17° distance * Sun: 76° distance * rough path description: Brazil Additional comments ------------------- small mag drop The occultation path -------------------- * approximate projected width [km]: 247 * 1 sigma uncertainty interval [path widths]: +/- 0.15 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .022 +/- .020) * 1 sigma uncertainty ellipse (major, minor, PA): ( .022", .020", 89° ) * approx speed of asteroid's shadow [km/s]: 26.1116 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1863-02249-1 by 9 Metis on 2012 Sep 8 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 - 66 0 0 -36 50 46 6 25 15 0 61 -48 .. .. .. -35 35 11 .. .. .. -35 12 45 - 65 0 0 -36 24 7 6 25 15 1 61 -48 -37 41 4 -35 8 35 -38 4 26 -34 46 10 - 64 0 0 -35 57 24 6 25 15 2 60 -47 -37 14 17 -34 41 54 -37 37 38 -34 19 31 - 63 0 0 -35 30 37 6 25 15 3 59 -47 -36 47 26 -34 15 11 -37 10 46 -33 52 48 - 62 0 0 -35 3 47 6 25 16 4 59 -46 -36 20 32 -33 48 25 -36 43 51 -33 26 3 - 61 0 0 -34 36 55 6 25 16 5 58 -46 -35 53 36 -33 21 37 -36 16 53 -32 59 17 - 60 0 0 -34 10 2 6 25 16 6 58 -45 -35 26 38 -32 54 48 -35 49 54 -32 32 30 - 59 0 0 -33 43 8 6 25 17 7 57 -45 -34 59 39 -32 28 0 -35 22 53 -32 5 42 - 58 0 0 -33 16 14 6 25 17 7 57 -44 -34 32 39 -32 1 11 -34 55 52 -31 38 55 - 57 0 0 -32 49 22 6 25 18 8 56 -44 -34 5 41 -31 34 24 -34 28 51 -31 12 10 - 56 0 0 -32 22 31 6 25 19 9 55 -43 -33 38 44 -31 7 39 -34 1 53 -30 45 27 - 55 0 0 -31 55 43 6 25 20 10 55 -43 -33 11 49 -30 40 57 -33 34 56 -30 18 47 - 54 0 0 -31 28 58 6 25 21 11 54 -42 -32 44 58 -30 14 19 -33 8 2 -29 52 10 - 53 0 0 -31 2 18 6 25 22 12 54 -42 -32 18 10 -29 47 46 -32 41 12 -29 25 39 - 52 0 0 -30 35 43 6 25 23 13 53 -41 -31 51 27 -29 21 18 -32 14 27 -28 59 13 - 51 0 0 -30 9 13 6 25 24 14 53 -40 -31 24 50 -28 54 55 -31 47 48 -28 32 53 - 50 0 0 -29 42 50 6 25 25 15 52 -40 -30 58 19 -28 28 40 -31 21 14 -28 6 40 - 49 0 0 -29 16 35 6 25 27 16 52 -39 -30 31 56 -28 2 33 -30 54 48 -27 40 34 - 48 0 0 -28 50 28 6 25 28 17 51 -38 -30 5 40 -27 36 34 -30 28 30 -27 14 38 - 47 0 0 -28 24 30 6 25 30 18 51 -38 -29 39 33 -27 10 44 -30 2 21 -26 48 50 - 46 0 0 -27 58 42 6 25 31 19 50 -37 -29 13 36 -26 45 4 -29 36 21 -26 23 13 - 45 0 0 -27 33 4 6 25 33 20 49 -36 -28 47 50 -26 19 35 -29 10 31 -25 57 46 - 44 0 0 -27 7 38 6 25 35 21 49 -35 -28 22 14 -25 54 18 -28 44 53 -25 32 31 - 43 0 0 -26 42 24 6 25 37 22 48 -34 -27 56 50 -25 29 12 -28 19 26 -25 7 29 - 42 0 0 -26 17 22 6 25 39 23 48 -34 -27 31 39 -25 4 20 -27 54 12 -24 42 39 - 41 0 0 -25 52 34 6 25 41 24 47 -33 -27 6 42 -24 39 41 -27 29 11 -24 18 3 - 40 0 0 -25 28 1 6 25 43 25 47 -32 -26 41 58 -24 15 17 -27 4 25 -23 53 41 - 39 0 0 -25 3 42 6 25 45 26 46 -31 -26 17 30 -23 51 8 -26 39 53 -23 29 35 - 38 0 0 -24 39 39 6 25 48 27 45 -30 -25 53 17 -23 27 14 -26 15 37 -23 5 44 - 37 0 0 -24 15 52 6 25 50 27 45 -30 -25 29 20 -23 3 37 -25 51 37 -22 42 9 - 36 0 0 -23 52 22 6 25 53 28 44 -29 -25 5 40 -22 40 16 -25 27 54 -22 18 52 - 35 0 0 -23 29 10 6 25 55 29 44 -28 -24 42 17 -22 17 14 -25 4 28 -21 55 52 - 34 0 0 -23 6 16 6 25 58 30 43 -27 -24 19 13 -21 54 30 -24 41 21 -21 33 11 - 33 0 0 -22 43 40 6 26 0 31 42 -26 -23 56 28 -21 32 4 -24 18 32 -21 10 48 - 32 0 0 -22 21 25 6 26 3 32 42 -25 -23 34 2 -21 9 58 -23 56 3 -20 48 45 - 31 0 0 -21 59 29 6 26 6 33 41 -24 -23 11 56 -20 48 12 -23 33 54 -20 27 1 - 30 0 0 -21 37 54 6 26 9 34 40 -23 -22 50 10 -20 26 46 -23 12 6 -20 5 39 - 29 0 0 -21 16 39 6 26 12 35 40 -22 -22 28 46 -20 5 42 -22 50 38 -19 44 37 - 28 0 0 -20 55 47 6 26 15 36 39 -21 -22 7 43 -19 44 59 -22 29 32 -19 23 57 - 27 0 0 -20 35 16 6 26 18 36 38 -20 -21 47 3 -19 24 38 -22 8 49 -19 3 39 - 26 0 0 -20 15 9 6 26 21 37 37 -20 -21 26 45 -19 4 39 -21 48 28 -18 43 43 - 25 0 0 -19 55 24 6 26 24 38 36 -19 -21 6 51 -18 45 4 -21 28 30 -18 24 10 - 24 0 0 -19 36 3 6 26 28 39 36 -18 -20 47 20 -18 25 52 -21 8 56 -18 5 1 - 23 0 0 -19 17 5 6 26 31 40 35 -17 -20 28 13 -18 7 4 -20 49 47 -17 46 16 - 22 0 0 -18 58 33 6 26 35 40 34 -16 -20 9 30 -17 48 40 -20 31 1 -17 27 55 - 21 0 0 -18 40 25 6 26 38 41 33 -15 -19 51 13 -17 30 41 -20 12 41 -17 9 58 - 20 0 0 -18 22 42 6 26 42 42 32 -14 -19 33 21 -17 13 7 -19 54 46 -16 52 27 - 19 0 0 -18 5 25 6 26 45 43 31 -13 -19 15 55 -16 55 59 -19 37 17 -16 35 21 - 18 0 0 -17 48 33 6 26 49 44 30 -12 -18 58 55 -16 39 16 -19 20 14 -16 18 41 - 17 0 0 -17 32 8 6 26 52 44 29 -11 -18 42 21 -16 23 0 -19 3 38 -16 2 27 - 16 0 0 -17 16 10 6 26 56 45 28 -10 -18 26 14 -16 7 9 -18 47 28 -15 46 39 - 15 0 0 -17 0 39 6 27 0 46 27 -9 -18 10 34 -15 51 46 -18 31 46 -15 31 18 - 14 0 0 -16 45 35 6 27 4 46 26 -8 -17 55 22 -15 36 50 -18 16 31 -15 16 24 - 13 0 0 -16 30 58 6 27 8 47 25 -7 -17 40 37 -15 22 21 -18 1 44 -15 1 57 - 12 0 0 -16 16 49 6 27 11 48 24 -6 -17 26 20 -15 8 19 -17 47 25 -14 47 58 - 11 0 0 -16 3 8 6 27 15 48 23 -5 -17 12 32 -14 54 46 -17 33 34 -14 34 26 - 10 0 0 -15 49 56 6 27 19 49 22 -4 -16 59 12 -14 41 40 -17 20 12 -14 21 23 - 9 0 0 -15 37 12 6 27 23 49 20 -3 -16 46 21 -14 29 3 -17 7 18 -14 8 48 - 8 0 0 -15 24 56 6 27 27 50 19 -2 -16 33 59 -14 16 54 -16 54 54 -13 56 41 - 7 0 0 -15 13 10 6 27 31 50 18 -1 -16 22 6 -14 5 14 -16 42 59 -13 45 3 Uncertainty in time = +/- 1 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: TYC 1863-02249-1 * constellation : Orion * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 58 32.0037 DE: +22 45 05.747 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .019, .019 ) * V mag [mag]: 11.6 * B mag [mag]: 11.8 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (9) Metis approx. diameter [km]: 200 approx. diameter ["]: .131 distance from Earth [AU]: 2.09900 * 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, 83° remarks: * orbital elements for (9) Metis : Mean anomaly = 349.85817419 deg Arg. of pericenter = 5.97229009 deg Long. of node = 68.94645340 deg Inclination = 5.57556404 deg Eccentricity = 0.12300731 Semimajor axis = 2.38692412 AU Perihelion dist = 2.09331499 AU Mag: H = 6.23, G = 0.17 Epoch of elements : MJD 56178.27000000 TDT (2012 Sep 08.270) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 8 9 Metis 6h 28.5m UT 11.6 5 58 32.004 22 45 5.75TYC 1863-02249-1 11.8 10.7 200 7.7 2.099 4.453 4.59 4.7726 22.750 82.27 5.52 6.4755 0.04247 -0.58693 14.69740 1.09503 -0.00512 -0.00003 2000 347.6478722012 831.00000 5.972290 68.946453 5.5755640.12300731 2.3869241 2.0933150 6.3 5.00.17 RATE 2.6726750 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.022 0.020 89 1.15 0.020 0 0-3-3 056129.0020120908_2249-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 21, 15:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org