IOTA/IOTA-ES occultation update for (159) Aemilia / TYC 1282-00440-1 event on 2012 Sep 15, 07:56 UT Visible from Brazil, Peru Summary ------- On 2012 Sep 15 UT, the 130 km diameter asteroid (159) Aemilia will occult a 11.0 mag star in the constellation Taurus for observers along a path across Brazil, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.6 mag to 13.5 mag (the magnitude of the asteroid) for at most 8.8 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: 93 * date and approx. time of event: 2012 Sep 15, 07:49 - 2012 Sep 15, 07:57 UT * geocentric midpoint of event [JD]: 2456185.8307625 * magnitude of target star: 11.0 * magnitude drop [mag]: 2.6 * estimated maximum duration [s]: 8.8 * Moon: 1 % sunlit, 84° distance * Sun: 95° distance * rough path description: Brazil, Peru The occultation path -------------------- * approximate projected width [km]: 137 * 1 sigma uncertainty interval [path widths]: +/- 0.47 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .036 +/- .032) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .032", 88° ) * approx speed of asteroid's shadow [km/s]: 14.7452 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1282-00440-1 by 159 Aemilia on 2012 Sep 15 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 -120 0 0 -14 26 35 7 49 30 0 73 -78 .. .. .. -13 47 52 .. .. .. -13 11 37 -119 0 0 -14 8 51 7 49 30 1 73 -79 -14 47 42 -13 30 9 -15 24 21 -12 53 55 -118 0 0 -13 51 12 7 49 31 2 73 -79 -14 30 1 -13 12 31 -15 6 40 -12 36 17 -117 0 0 -13 33 37 7 49 31 3 72 -79 -14 12 26 -12 54 58 -14 49 3 -12 18 45 -116 0 0 -13 16 8 7 49 31 4 72 -79 -13 54 55 -12 37 30 -14 31 31 -12 1 18 -115 0 0 -12 58 45 7 49 32 5 72 -79 -13 37 31 -12 20 7 -14 14 6 -11 43 57 -114 0 0 -12 41 27 7 49 33 6 72 -79 -13 20 12 -12 2 52 -13 56 46 -11 26 42 -113 0 0 -12 24 17 7 49 34 7 71 -79 -13 3 0 -11 45 42 -13 39 33 -11 9 34 -112 0 0 -12 7 13 7 49 35 8 71 -79 -12 45 55 -11 28 40 -13 22 27 -10 52 33 -111 0 0 -11 50 17 7 49 36 9 71 -78 -12 28 58 -11 11 45 -13 5 28 -10 35 40 -110 0 0 -11 33 28 7 49 38 10 71 -78 -12 12 8 -10 54 58 -12 48 36 -10 18 54 -109 0 0 -11 16 48 7 49 39 11 71 -77 -11 55 26 -10 38 19 -12 31 53 -10 2 16 -108 0 0 -11 0 16 7 49 41 12 70 -77 -11 38 52 -10 21 49 -12 15 18 - 9 45 48 -107 0 0 -10 43 53 7 49 43 13 70 -76 -11 22 28 -10 5 27 -11 58 52 - 9 29 28 -106 0 0 -10 27 40 7 49 45 14 70 -75 -11 6 13 - 9 49 15 -11 42 35 - 9 13 17 -105 0 0 -10 11 36 7 49 47 15 70 -75 -10 50 7 - 9 33 13 -11 26 28 - 8 57 16 -104 0 0 - 9 55 41 7 49 49 16 70 -74 -10 34 11 - 9 17 21 -11 10 30 - 8 41 25 -103 0 0 - 9 39 58 7 49 51 17 69 -73 -10 18 26 - 9 1 38 -10 54 43 - 8 25 45 -102 0 0 - 9 24 25 7 49 54 18 69 -72 -10 2 51 - 8 46 7 -10 39 7 - 8 10 15 -101 0 0 - 9 9 3 7 49 56 19 69 -71 - 9 47 27 - 8 30 47 -10 23 42 - 7 54 57 -100 0 0 - 8 53 52 7 49 59 20 69 -70 - 9 32 15 - 8 15 38 -10 8 28 - 7 39 49 - 99 0 0 - 8 38 53 7 50 2 22 69 -70 - 9 17 14 - 8 0 41 - 9 53 25 - 7 24 54 - 98 0 0 - 8 24 7 7 50 5 23 68 -69 - 9 2 26 - 7 45 56 - 9 38 35 - 7 10 11 - 97 0 0 - 8 9 32 7 50 8 24 68 -68 - 8 47 50 - 7 31 24 - 9 23 57 - 6 55 40 - 96 0 0 - 7 55 11 7 50 12 25 68 -67 - 8 33 26 - 7 17 4 - 9 9 32 - 6 41 22 - 95 0 0 - 7 41 2 7 50 15 26 68 -66 - 8 19 16 - 7 2 57 - 8 55 20 - 6 27 17 - 94 0 0 - 7 27 7 7 50 19 27 67 -65 - 8 5 19 - 6 49 4 - 8 41 21 - 6 13 25 - 93 0 0 - 7 13 26 7 50 23 28 67 -64 - 7 51 35 - 6 35 24 - 8 27 36 - 5 59 47 - 92 0 0 - 6 59 58 7 50 27 29 67 -63 - 7 38 6 - 6 21 58 - 8 14 5 - 5 46 23 - 91 0 0 - 6 46 45 7 50 31 30 67 -62 - 7 24 51 - 6 8 47 - 8 0 48 - 5 33 13 - 90 0 0 - 6 33 46 7 50 35 31 67 -61 - 7 11 50 - 5 55 50 - 7 47 45 - 5 20 18 - 89 0 0 - 6 21 2 7 50 39 32 66 -60 - 6 59 4 - 5 43 8 - 7 34 58 - 5 7 38 - 88 0 0 - 6 8 33 7 50 43 33 66 -59 - 6 46 33 - 5 30 41 - 7 22 25 - 4 55 12 - 87 0 0 - 5 56 19 7 50 48 34 66 -58 - 6 34 18 - 5 18 29 - 7 10 8 - 4 43 2 - 86 0 0 - 5 44 21 7 50 52 35 66 -57 - 6 22 18 - 5 6 32 - 6 58 6 - 4 31 7 - 85 0 0 - 5 32 39 7 50 57 36 65 -56 - 6 10 34 - 4 54 52 - 6 46 21 - 4 19 29 - 84 0 0 - 5 21 13 7 51 2 37 65 -55 - 5 59 6 - 4 43 28 - 6 34 51 - 4 8 6 - 83 0 0 - 5 10 3 7 51 7 38 65 -54 - 5 47 55 - 4 32 20 - 6 23 38 - 3 56 59 - 82 0 0 - 4 59 10 7 51 12 39 64 -53 - 5 37 0 - 4 21 28 - 6 12 41 - 3 46 10 - 81 0 0 - 4 48 33 7 51 17 40 64 -52 - 5 26 21 - 4 10 53 - 6 2 1 - 3 35 36 - 80 0 0 - 4 38 14 7 51 23 41 64 -51 - 5 16 0 - 4 0 35 - 5 51 39 - 3 25 20 - 79 0 0 - 4 28 11 7 51 28 42 63 -50 - 5 5 56 - 3 50 35 - 5 41 33 - 3 15 21 - 78 0 0 - 4 18 26 7 51 34 43 63 -49 - 4 56 10 - 3 40 52 - 5 31 45 - 3 5 39 - 77 0 0 - 4 8 59 7 51 39 44 63 -48 - 4 46 41 - 3 31 26 - 5 22 15 - 2 56 15 - 76 0 0 - 3 59 50 7 51 45 45 62 -47 - 4 37 30 - 3 22 18 - 5 13 2 - 2 47 8 - 75 0 0 - 3 50 58 7 51 51 46 62 -46 - 4 28 37 - 3 13 28 - 5 4 8 - 2 38 20 - 74 0 0 - 3 42 25 7 51 57 47 61 -45 - 4 20 2 - 3 4 56 - 4 55 31 - 2 29 49 - 73 0 0 - 3 34 9 7 52 3 48 61 -44 - 4 11 45 - 2 56 42 - 4 47 13 - 2 21 37 - 72 0 0 - 3 26 13 7 52 9 48 60 -43 - 4 3 47 - 2 48 47 - 4 39 14 - 2 13 43 - 71 0 0 - 3 18 35 7 52 15 49 60 -42 - 3 56 8 - 2 41 10 - 4 31 33 - 2 6 7 - 70 0 0 - 3 11 15 7 52 21 50 59 -41 - 3 48 47 - 2 33 52 - 4 24 11 - 1 58 51 - 69 0 0 - 3 4 15 7 52 28 51 59 -40 - 3 41 45 - 2 26 53 - 4 17 9 - 1 51 53 - 68 0 0 - 2 57 34 7 52 34 52 58 -39 - 3 35 3 - 2 20 13 - 4 10 25 - 1 45 14 - 67 0 0 - 2 51 12 7 52 41 53 58 -38 - 3 28 40 - 2 13 52 - 4 4 0 - 1 38 54 - 66 0 0 - 2 45 9 7 52 47 54 57 -37 - 3 22 36 - 2 7 50 - 3 57 55 - 1 32 53 - 65 0 0 - 2 39 25 7 52 54 55 56 -36 - 3 16 51 - 2 2 8 - 3 52 10 - 1 27 12 - 64 0 0 - 2 34 1 7 53 1 56 55 -35 - 3 11 26 - 1 56 45 - 3 46 44 - 1 21 50 - 63 0 0 - 2 28 57 7 53 8 57 55 -34 - 3 6 21 - 1 51 41 - 3 41 38 - 1 16 47 - 62 0 0 - 2 24 13 7 53 14 58 54 -33 - 3 1 36 - 1 46 58 - 3 36 52 - 1 12 4 - 61 0 0 - 2 19 48 7 53 21 59 53 -32 - 2 57 10 - 1 42 34 - 3 32 25 - 1 7 41 - 60 0 0 - 2 15 43 7 53 28 59 52 -30 - 2 53 4 - 1 38 30 - 3 28 19 - 1 3 38 - 59 0 0 - 2 11 58 7 53 36 60 51 -29 - 2 49 19 - 1 34 46 - 3 24 33 - 0 59 54 - 58 0 0 - 2 8 33 7 53 43 61 49 -28 - 2 45 53 - 1 31 21 - 3 21 7 - 0 56 30 - 57 0 0 - 2 5 29 7 53 50 62 48 -27 - 2 42 48 - 1 28 17 - 3 18 1 - 0 53 27 - 56 0 0 - 2 2 44 7 53 57 63 47 -26 - 2 40 3 - 1 25 33 - 3 15 16 - 0 50 43 - 55 0 0 - 2 0 20 7 54 5 63 46 -25 - 2 37 38 - 1 23 9 - 3 12 50 - 0 48 20 - 54 0 0 - 1 58 16 7 54 12 64 44 -24 - 2 35 34 - 1 21 6 - 3 10 46 - 0 46 17 - 53 0 0 - 1 56 32 7 54 19 65 43 -23 - 2 33 50 - 1 19 22 - 3 9 1 - 0 44 34 - 52 0 0 - 1 55 9 7 54 27 66 41 -22 - 2 32 27 - 1 17 59 - 3 7 38 - 0 43 11 - 51 0 0 - 1 54 6 7 54 34 66 39 -21 - 2 31 23 - 1 16 57 - 3 6 34 - 0 42 8 - 50 0 0 - 1 53 24 7 54 42 67 37 -20 - 2 30 41 - 1 16 14 - 3 5 52 - 0 41 26 - 49 0 0 - 1 53 2 7 54 49 68 35 -19 - 2 30 19 - 1 15 52 - 3 5 30 - 0 41 4 - 48 0 0 - 1 53 0 7 54 57 68 33 -18 - 2 30 17 - 1 15 51 - 3 5 28 - 0 41 2 - 47 0 0 - 1 53 19 7 55 5 69 31 -17 - 2 30 36 - 1 16 10 - 3 5 47 - 0 41 21 - 46 0 0 - 1 53 58 7 55 12 69 28 -16 - 2 31 16 - 1 16 49 - 3 6 27 - 0 42 0 - 45 0 0 - 1 54 58 7 55 20 70 26 -15 - 2 32 16 - 1 17 48 - 3 7 27 - 0 43 0 - 44 0 0 - 1 56 18 7 55 28 70 23 -14 - 2 33 36 - 1 19 8 - 3 8 48 - 0 44 19 - 43 0 0 - 1 57 59 7 55 35 70 21 -13 - 2 35 18 - 1 20 49 - 3 10 29 - 0 45 59 - 42 0 0 - 2 0 0 7 55 43 71 18 -12 - 2 37 19 - 1 22 50 - 3 12 31 - 0 48 0 - 41 0 0 - 2 2 22 7 55 51 71 15 -11 - 2 39 41 - 1 25 11 - 3 14 54 - 0 50 20 - 40 0 0 - 2 5 4 7 55 59 71 12 -10 - 2 42 24 - 1 27 52 - 3 17 37 - 0 53 1 - 39 0 0 - 2 8 6 7 56 7 71 9 -9 - 2 45 27 - 1 30 54 - 3 20 40 - 0 56 2 - 38 0 0 - 2 11 28 7 56 14 71 6 -8 - 2 48 50 - 1 34 15 - 3 24 4 - 0 59 24 - 37 0 0 - 2 15 11 7 56 22 71 3 -7 - 2 52 33 - 1 37 57 - 3 27 48 - 1 3 5 - 36 0 0 - 2 19 14 7 56 30 71 360 -6 - 2 56 37 - 1 42 0 - 3 31 53 - 1 7 6 - 35 0 0 - 2 23 37 7 56 38 71 356 -5 - 3 1 1 - 1 46 22 - 3 36 18 - 1 11 28 - 34 0 0 - 2 28 20 7 56 46 71 353 -4 - 3 5 45 - 1 51 4 - 3 41 2 - 1 16 9 - 33 0 0 - 2 33 23 7 56 53 71 350 -3 - 3 10 49 - 1 56 6 - 3 46 7 - 1 21 10 - 32 0 0 - 2 38 46 7 57 1 71 348 -2 - 3 16 13 - 2 1 28 - 3 51 32 - 1 26 31 - 31 0 0 - 2 44 29 7 57 9 70 345 -1 - 3 21 56 - 2 7 9 - 3 57 17 - 1 32 11 Uncertainty in time = +/- 5 secs Prediction of 2012 Jul 21.0 Data for the target star ------------------------ * name: TYC 1282-00440-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 09 55.6502 DE: +16 20 36.981 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .031, .031 ) * V mag [mag]: 11.0 * B mag [mag]: 12.0 * Apparent position with proper motion RA(deg): 77.6698888628 DE(deg): 16.3587885284 * Equation of equinoxes (radians) : 0.000067552449850 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (159) Aemilia approx. diameter [km]: 130 approx. diameter ["]: .069 distance from Earth [AU]: 2.60400 * orbital information: orbit source: Preston date of fit: 2012 Jul 21 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 1151 number of rejected observations: 120 time covered by the observations: 1904 Jan 11 - 2012 Jan 04 1 sigma uncertainty ellipse (major, minor, PA): 0.019, 0.009, 81° remarks: * orbital elements for (159) Aemilia : Mean anomaly = 318.68922106 deg Arg. of pericenter = 333.61937986 deg Long. of node = 134.20887555 deg Inclination = 6.12366126 deg Eccentricity = 0.11004746 Semimajor axis = 3.10616722 AU Perihelion dist = 2.76434142 AU Mag: H = 8.22, G = 0.15 Epoch of elements : MJD 56185.33100000 TDT (2012 Sep 15.331) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Sep 15 159 Aemilia 7h 56.3m UT 11.0 5 9 55.650 16 20 36.98TYC 1282-00440-1 12.0 13.5 130 8.8 2.604 1.948 -1.78 -36.2804 16.344 59.71 2.82 7.9383 -0.02532 -0.31825 8.30594 -0.52649 -0.00570 -0.00044 2000 317.7294332012 910.00000333.619380134.208876 6.1236610.11004746 3.1061672 2.7643414 8.1 5.00.15 RATE 1.8003910 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.032 88 1.47 0.032 0 0 2 1 056129.0020120915_0440-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 22, 03:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org