IOTA/IOTA-ES occultation update for (1447) Utra / TYC 7394-00974-1 event on 2012 Aug 12, 16:24 UT Visible from N Australia, Africa Summary ------- On 2012 Aug 12 UT, the 12 km diameter asteroid (1447) Utra will occult a 9.2 mag star in the constellation Sagittarius for observers along a path across N Australia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.3 mag to 15.5 mag (the magnitude of the asteroid) for at most 2.6 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: 17 * date and approx. time of event: 2012 Aug 12, 16:00 - 2012 Aug 12, 16:41 UT * geocentric midpoint of event [JD]: 2456152.1827125 * magnitude of target star: 9.2 * magnitude drop [mag]: 6.3 * estimated maximum duration [s]: 2.6 * Moon: 24 % sunlit, 162° distance * Sun: 137° distance * rough path description: N Australia, Africa The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 4.07 * 1 sigma uncertainty interval [seconds]: +/- 13.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .052 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .035", 89° ) * approx speed of asteroid's shadow [km/s]: 4.4785 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7394-00974-1 by 1447 Utra on 2012 Aug 12 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 24 0 0 9 8 7 16 41 47 33 135 -1 9 12 11 9 4 3 9 45 20 8 31 3 25 0 0 8 31 11 16 41 31 34 135 -2 8 35 15 8 27 8 9 8 19 7 54 14 26 0 0 7 54 34 16 41 15 35 136 -3 7 58 36 7 50 31 8 31 34 7 17 43 27 0 0 7 18 14 16 40 58 36 136 -4 7 22 16 7 14 12 7 55 8 6 41 29 28 0 0 6 42 13 16 40 41 37 136 -5 6 46 14 6 38 12 7 19 1 6 5 35 29 0 0 6 6 32 16 40 24 38 137 -6 6 10 32 6 2 32 6 43 13 5 30 1 30 0 0 5 31 12 16 40 6 39 137 -7 5 35 11 5 27 12 6 7 45 4 54 47 31 0 0 4 56 12 16 39 48 40 137 -8 5 0 11 4 52 14 5 32 39 4 19 55 32 0 0 4 21 35 16 39 29 42 137 -9 4 25 33 4 17 37 4 57 55 3 45 24 33 0 0 3 47 20 16 39 10 43 138 -10 3 51 17 3 43 22 4 23 33 3 11 16 34 0 0 3 13 28 16 38 51 44 138 -11 3 17 24 3 9 31 3 49 33 2 37 31 35 0 0 2 39 59 16 38 32 45 139 -12 2 43 55 2 36 4 3 15 58 2 4 9 36 0 0 2 6 55 16 38 12 46 139 -13 2 10 50 2 3 0 2 42 47 1 31 12 37 0 0 1 34 15 16 37 52 47 139 -14 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Uncertainty in time = +/- 15 secs Prediction of 2012 Aug 7.0 Data for the target star ------------------------ * name: TYC 7394-00974-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 35 51.9658 DE: -30 02 20.838 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .024 ) * V mag [mag]: 9.2 * B mag [mag]: 10.4 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1447) Utra approx. diameter [km]: 12 approx. diameter ["]: .009 distance from Earth [AU]: 1.80100 * orbital information: orbit source: Preston date of fit: 2012 Aug 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1174 number of rejected observations: 37 time covered by the observations: 1938 Jan 26 - 2012 Aug 03 1 sigma uncertainty ellipse (major, minor, PA): 0.046, 0.026, 89° remarks: * orbital elements for (1447) Utra : Mean anomaly = 192.54317725 deg Arg. of pericenter = 65.73606765 deg Long. of node = 35.60725269 deg Inclination = 4.78665128 deg Eccentricity = 0.04098505 Semimajor axis = 2.53488509 AU Perihelion dist = 2.43099270 AU Mag: H = 11.70, G = 0.15 Epoch of elements : MJD 56151.68300000 TDT (2012 Aug 12.683) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Aug 12 1447 Utra 16h 23.1m UT 9.2 18 35 51.966-30 2 20.84TYC 7394-00974-1 10.4 15.5 12 2.6 1.801 -0.912 3.38 71.6673 -30.040 -64.54 14.70 16.3851 0.08049 0.28101 -2.43099 0.69284 0.00368 0.00072 2000 192.1321692012 811.00000 65.736068 35.607253 4.7866510.04098505 2.5348851 2.430992711.3 5.00.15 RATE 2.4421180 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.035 89 5.07 0.037 0 0-2 2 056146.0020120812_0974-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 06, 19:36 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org