IOTA/IOTA-ES occultation update for (1447) Utra / TYC 6885-02477-1 event on 2012 Jul 08, 11:50 UT Visible from New Guinea Summary ------- On 2012 Jul 08 UT, the 12 km diameter asteroid (1447) Utra will occult a 9.8 mag star in the constellation Sagittarius for observers along a path across New Guinea. In the case of an occultation, the combined light of the asteroid and the star will drop by 5.0 mag to 14.8 mag (the magnitude of the asteroid) for at most 1.0 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: 15 * date and approx. time of event: 2012 Jul 08, 11:41 - 2012 Jul 08, 11:59 UT * geocentric midpoint of event [JD]: 2456116.99334583 * magnitude of target star: 9.8 * magnitude drop [mag]: 5.0 * estimated maximum duration [s]: 1.0 * Moon: 75 % sunlit, 63° distance * Sun: 172° distance * rough path description: New Guinea The occultation path -------------------- * approximate projected width [km]: 13 * 1 sigma uncertainty interval [path widths]: +/- 4.38 * 1 sigma uncertainty interval [seconds]: +/- 5.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .061 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .061", .044", 86° ) * approx speed of asteroid's shadow [km/s]: 11.3152 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6885-02477-1 by 1447 Utra on 2012 Jul 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 96 0 0 9 58 51 11 59 14 1 121 0 10 2 53 9 54 48 10 38 27 .. .. .. 97 0 0 9 24 12 11 59 14 2 121 -1 9 28 14 9 20 10 10 3 42 .. .. .. 98 0 0 8 49 54 11 59 13 3 121 -3 8 53 55 8 45 53 9 29 17 .. .. .. 99 0 0 8 15 56 11 59 13 4 121 -4 8 19 57 8 11 56 8 55 12 7 36 53 100 0 0 7 42 21 11 59 12 5 121 -5 7 46 21 7 38 21 8 21 29 7 3 24 101 0 0 7 9 7 11 59 11 6 121 -6 7 13 7 7 5 8 7 48 9 6 30 18 102 0 0 6 36 17 11 59 9 7 121 -7 6 40 16 6 32 19 7 15 11 5 57 35 103 0 0 6 3 51 11 59 8 9 122 -8 6 7 49 5 59 54 6 42 38 5 25 16 104 0 0 5 31 50 11 59 6 10 122 -9 5 35 47 5 27 53 6 10 29 4 53 22 105 0 0 5 0 14 11 59 4 11 122 -10 5 4 11 4 56 18 5 38 46 4 21 54 106 0 0 4 29 4 11 59 1 12 122 -12 4 33 0 4 25 9 5 7 28 3 50 52 107 0 0 3 58 21 11 58 59 13 122 -13 4 2 16 3 54 27 4 36 38 3 20 16 108 0 0 3 28 5 11 58 56 14 122 -14 3 31 59 3 24 12 4 6 14 2 50 7 109 0 0 2 58 17 11 58 53 15 122 -15 3 2 10 2 54 24 3 36 18 2 20 27 110 0 0 2 28 57 11 58 50 16 122 -16 2 32 50 2 25 5 3 6 51 1 51 14 111 0 0 2 0 6 11 58 47 17 122 -17 2 3 58 1 56 14 2 37 52 1 22 30 112 0 0 1 31 44 11 58 43 18 122 -18 1 35 35 1 27 53 2 9 22 0 54 15 113 0 0 1 3 51 11 58 40 20 122 -19 1 7 41 1 0 1 1 41 22 0 26 30 114 0 0 0 36 28 11 58 36 21 122 -20 0 40 18 0 32 39 1 13 52 - 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Uncertainty in time = +/- 6 secs Prediction of 2012 Jun 6.0 Data for the target star ------------------------ * name: TYC 6885-02477-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 03 49.6275 DE: -29 56 52.130 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .032 ) * V mag [mag]: 9.8 * B mag [mag]: 10.2 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1447) Utra approx. diameter [km]: 12 approx. diameter ["]: .010 distance from Earth [AU]: 1.62800 * orbital information: orbit source: Preston date of fit: 2012 Jun 06 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1172 number of rejected observations: 37 time covered by the observations: 1938 Jan 26 - 2011 Jun 24 1 sigma uncertainty ellipse (major, minor, PA): 0.056, 0.030, 85° remarks: * orbital elements for (1447) Utra : Mean anomaly = 183.95685808 deg Arg. of pericenter = 65.72836563 deg Long. of node = 35.60787287 deg Inclination = 4.78666906 deg Eccentricity = 0.04094265 Semimajor axis = 2.53498922 AU Perihelion dist = 2.43120005 AU Mag: H = 11.70, G = 0.15 Epoch of elements : MJD 56116.49400000 TDT (2012 Jul 08.494) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Jul 8 1447 Utra 11h 50.4m UT 9.8 19 3 49.628-29 56 52.13TYC 6885-02477-1 10.2 14.8 12 1.0 1.628 -2.627 -5.00 -178.4856 -29.946 3.69 22.39 11.8403 -0.04999 0.34091 -6.31902 -0.92677 0.00015 0.00071 2000 182.3710442012 7 2.00000 65.728366 35.607873 4.7866690.04094265 2.5349892 2.431200011.3 5.00.15 RATE 2.4419680 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.061 0.044 86 5.38 0.045 0 0-5 0 056084.0020120708_2477-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jun 06, 02:20 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org