IOTA/IOTA-ES occultation update for (2108) Otto Schmidt / TYC 6343-01660-1 event on 2012 Aug 30, 22:42 UT Visible from Brazil Summary ------- On 2012 Aug 30 UT, the 22 km diameter asteroid (2108) Otto Schmidt will occult a 9.0 mag star in the constellation Capricornus 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 6.5 mag to 15.5 mag (the magnitude of the asteroid) for at most 2.8 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: 21 * date and approx. time of event: 2012 Aug 30, 22:29 - 2012 Aug 30, 22:52 UT * geocentric midpoint of event [JD]: 2456170.44572083 * magnitude of target star: 9.0 * magnitude drop [mag]: 6.5 * estimated maximum duration [s]: 2.8 * Moon: 99 % sunlit, 24° distance * Sun: 150° distance * rough path description: Brazil Additional comments ------------------- close double star The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 3.17 * 1 sigma uncertainty interval [seconds]: +/- 9.3 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .079 +/- .055) * 1 sigma uncertainty ellipse (major, minor, PA): ( .084", .049", 67° ) * approx speed of asteroid's shadow [km/s]: 8.0388 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6343-01660-1 by 2108 Otto Schmidt on 2012 Aug 30 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 - 75 0 0 -14 4 44 22 52 41 30 106 0 -13 57 51 -14 11 37 -13 14 21 -14 55 21 - 74 0 0 -14 32 44 22 52 33 31 106 -1 -14 25 51 -14 39 37 -13 42 19 -15 23 23 - 73 0 0 -15 0 45 22 52 25 32 105 -2 -14 53 52 -15 7 38 -14 10 19 -15 51 25 - 72 0 0 -15 28 45 22 52 17 33 105 -3 -15 21 52 -15 35 39 -14 38 18 -16 19 27 - 71 0 0 -15 56 46 22 52 9 34 105 -4 -15 49 52 -16 3 39 -15 6 17 -16 47 29 - 70 0 0 -16 24 45 22 52 0 35 104 -5 -16 17 51 -16 31 38 -15 34 15 -17 15 29 - 69 0 0 -16 52 42 22 51 52 36 104 -6 -16 45 48 -16 59 36 -16 2 11 -17 43 26 - 68 0 0 -17 20 36 22 51 43 37 103 -7 -17 13 42 -17 27 30 -16 30 5 -18 11 21 - 67 0 0 -17 48 27 22 51 34 38 103 -8 -17 41 33 -17 55 21 -16 57 56 -18 39 13 - 66 0 0 -18 16 14 22 51 25 39 102 -9 -18 9 21 -18 23 9 -17 25 43 -19 7 0 - 65 0 0 -18 43 57 22 51 15 40 102 -10 -18 37 3 -18 50 51 -17 53 25 -19 34 43 - 64 0 0 -19 11 34 22 51 6 41 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14 2 247 -20 -30 36 2 -30 49 35 .. .. .. -31 32 38 96 0 0 -30 19 50 22 29 14 1 246 -19 -30 13 3 -30 26 37 .. .. .. -31 9 45 Uncertainty in time = +/- 11 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 6343-01660-1 * constellation : Capricornus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 43 10.8567 DE: -20 48 38.900 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .023 ) * V mag [mag]: 9.0 * B mag [mag]: 9.5 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2108) Otto Schmidt approx. diameter [km]: 22 approx. diameter ["]: .020 distance from Earth [AU]: 1.50800 * orbital information: orbit source: Preston date of fit: 2012 Aug 25 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 892 number of rejected observations: 13 time covered by the observations: 1948 Nov 04 - 2012 Aug 13 1 sigma uncertainty ellipse (major, minor, PA): 0.080, 0.043, 65° remarks: * orbital elements for (2108) Otto Schmidt : Mean anomaly = 280.79701403 deg Arg. of pericenter = 71.20381605 deg Long. of node = 328.00405962 deg Inclination = 10.79185589 deg Eccentricity = 0.00409720 Semimajor axis = 2.43591355 AU Perihelion dist = 2.42593312 AU Mag: H = 12.02, G = 0.15 Epoch of elements : MJD 56169.94600000 TDT (2012 Aug 30.946) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 30 2108 Otto Schmidt 22h 41.8m UT 9.0 20 43 10.857-20 48 38.90TYC 6343-01660-1 9.5 15.5 22 2.8 1.508 -1.821 6.88 -9.1868 -20.813 -160.37 8.59 22.6973 -0.07516 -0.28449 -4.38139 1.17936 0.00259 0.00091 2000 278.2185582012 821.00000 71.203816328.004060 10.7918560.00409720 2.4359136 2.425933112.0 5.00.15 RATE 2.5924550 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.084 0.049 67 4.17 0.064 0 0-3 0 056165.0020120830_1660-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 25, 22:14 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org