IOTA/IOTA-ES occultation update for (3118) Claytonsmith / TYC 1721-00648-1 event on 2012 Sep 22, 15:06 UT Visible from Japan, China, India Summary ------- On 2012 Sep 22 UT, the 35 km diameter asteroid (3118) Claytonsmith will occult a 9.4 mag star in the constellation Pegasus for observers along a path across Japan, China, India. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.2 mag to 15.6 mag (the magnitude of the asteroid) for at most 2.5 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Hugh Harris, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 33 * date and approx. time of event: 2012 Sep 22, 14:59 - 2012 Sep 22, 15:13 UT * geocentric midpoint of event [JD]: 2456193.12965417 * magnitude of target star: 9.4 * magnitude drop [mag]: 6.2 * estimated maximum duration [s]: 2.5 * Moon: 48 % sunlit, 93° distance * Sun: 164° distance * rough path description: Japan, China, India The occultation path -------------------- * approximate projected width [km]: 38 * 1 sigma uncertainty interval [path widths]: +/- 2.00 * 1 sigma uncertainty interval [seconds]: +/- 7.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .060 +/- .047) * 1 sigma uncertainty ellipse (major, minor, PA): ( .062", .044", 66° ) * approx speed of asteroid's shadow [km/s]: 13.8145 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1721-00648-1 by 3118 Claytonsmith on 2012 Sep 22 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 40 0 0 10 34 52 15 13 39 8 76 0 10 45 46 10 23 59 11 29 30 9 40 37 41 0 0 10 53 57 15 13 37 9 76 -1 11 4 51 10 43 3 11 48 40 9 59 38 42 0 0 11 13 19 15 13 36 10 76 -2 11 24 14 11 2 24 12 8 6 10 18 55 43 0 0 11 32 57 15 13 34 11 76 -3 11 43 53 11 22 1 12 27 49 10 38 28 44 0 0 11 52 51 15 13 32 12 77 -4 12 3 48 11 41 54 12 47 48 10 58 18 45 0 0 12 13 0 15 13 30 13 77 -5 12 23 59 12 2 3 13 8 2 11 18 23 46 0 0 12 33 25 15 13 28 14 77 -6 12 44 24 12 22 27 13 28 31 11 38 43 47 0 0 12 54 4 15 13 26 15 77 -7 13 5 4 12 43 5 13 49 15 11 59 17 48 0 0 13 14 57 15 13 24 16 78 -8 13 25 58 13 3 57 14 10 13 12 20 6 49 0 0 13 36 4 15 13 21 17 78 -9 13 47 6 13 25 3 14 31 24 12 41 8 50 0 0 13 57 24 15 13 18 18 78 -10 14 8 27 13 46 22 14 52 48 13 2 24 51 0 0 14 18 56 15 13 15 19 78 -11 14 30 0 14 7 53 15 14 25 13 23 52 52 0 0 14 40 41 15 13 12 20 79 -12 14 51 45 14 29 37 15 36 14 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Uncertainty in time = +/- 7 secs Prediction of 2012 Aug 5.0 Data for the target star ------------------------ * name: TYC 1721-00648-1 * constellation : Pegasus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 23 39 30.4800 DE: +15 16 03.641 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .031, .023 ) * V mag [mag]: 9.4 * B mag [mag]: 9.8 * Apparent position with proper motion RA(deg): 355.0477759763 DE(deg): 15.3423055492 * Equation of equinoxes (radians) : 0.000065896927533 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3118) Claytonsmith approx. diameter [km]: 35 approx. diameter ["]: .022 distance from Earth [AU]: 2.22800 * orbital information: orbit source: Preston date of fit: 2012 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 885 number of rejected observations: 19 time covered by the observations: 1938 Dec 15 - 2011 Jul 21 1 sigma uncertainty ellipse (major, minor, PA): 0.055, 0.038, 59° remarks: * orbital elements for (3118) Claytonsmith : Mean anomaly = 154.85525465 deg Arg. of pericenter = 259.07254429 deg Long. of node = 304.97730880 deg Inclination = 13.26318039 deg Eccentricity = 0.06160742 Semimajor axis = 3.03311017 AU Perihelion dist = 2.84624808 AU Mag: H = 10.89, G = 0.15 Epoch of elements : MJD 56192.63000000 TDT (2012 Sep 22.630) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 22 3118 Claytonsmith 15h 6.7m UT 9.4 23 39 30.480 15 16 3.64TYC 1721-00648-1 9.8 15.6 35 2.5 2.228 -2.048 -8.29 126.3199 15.270 -48.54 -0.01 15.1117 -0.11038 0.39495 -7.50939 -2.09916 0.00054 -0.00152 2000 154.3645422012 920.00000259.072544304.977309 13.2631800.06160742 3.0331102 2.846248110.9 5.00.15 RATE 1.8658290 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.062 0.044 66 3.00 0.044 0 0 0 1 056144.0020120922_0648-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 05, 22:40 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org