IOTA/IOTA-ES occultation update for (111) Ate / TYC 1856-00666-1 event on 2009 Sep 05, 03:16 UT Visible from Scandanavia, UK Summary ------- On 2009 Sep 05 UT, the 135 km diameter asteroid (111) Ate will occult a 9.2 mag star in the constellation Taurus for observers along a path across Scandanavia, UK. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.8 mag to 13.0 mag (the magnitude of the asteroid) for at most 5.7 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: 99 * date and approx. time of event: 2009 Sep 05, 03:13 - 2009 Sep 05, 03:16 UT * midpoint of event [JD]: 2455079.636725 * magnitude of target star: 9.2 * magnitude drop [mag]: 3.8 * estimated maximum duration [s]: 5.7 * Moon: 100 % sunlit, 95° distance * Sun: 79° distance * rough path description: Scandanavia, UK The occultation path -------------------- * approximate projected width [km]: 167 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 1.2 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .019 +/- .017) * 1 sigma uncertainty ellipse (major, minor, PA): ( .019", .017", 91° ) * approx speed of asteroid's shadow [km/s]: 23.6406 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1856-00666-1 by 111 Ate on 2009 Sep 5 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 - 55 0 0 27 20 31 3 13 15 1 59 -55 26 27 11 28 14 33 26 5 0 28 37 29 - 54 0 0 27 53 54 3 13 15 2 59 -55 27 0 24 28 48 8 26 38 9 29 11 8 - 53 0 0 28 27 32 3 13 15 3 60 -55 27 33 51 29 21 57 27 11 31 29 45 2 - 52 0 0 29 1 22 3 13 16 4 60 -54 28 7 31 29 55 58 27 45 7 30 19 8 - 51 0 0 29 35 24 3 13 16 5 61 -54 28 41 23 30 30 10 28 18 54 30 53 25 - 50 0 0 30 9 36 3 13 17 6 61 -53 29 15 25 31 4 33 28 52 52 31 27 51 - 49 0 0 30 43 57 3 13 18 7 62 -53 29 49 36 31 39 4 29 27 0 32 2 27 - 48 0 0 31 18 26 3 13 18 8 62 -52 30 23 56 32 13 43 30 1 16 32 37 10 - 47 0 0 31 53 2 3 13 19 9 63 -51 30 58 23 32 48 28 30 35 39 33 12 0 - 46 0 0 32 27 44 3 13 20 10 63 -51 31 32 56 33 23 19 31 10 9 33 46 54 - 45 0 0 33 2 29 3 13 21 11 64 -50 32 7 33 33 58 13 31 44 43 34 21 52 - 44 0 0 33 37 18 3 13 23 12 64 -49 32 42 14 34 33 10 32 19 20 34 56 52 - 43 0 0 34 12 8 3 13 24 13 65 -49 33 16 57 35 8 7 32 54 0 35 31 53 - 42 0 0 34 46 58 3 13 25 14 66 -48 33 51 40 35 43 5 33 28 40 36 6 54 - 41 0 0 35 21 48 3 13 27 15 66 -47 34 26 23 36 18 2 34 3 20 36 41 54 - 40 0 0 35 56 35 3 13 28 16 67 -47 35 1 4 36 52 55 34 37 59 37 16 50 - 39 0 0 36 31 19 3 13 30 17 68 -46 35 35 42 37 27 45 35 12 35 37 51 42 - 38 0 0 37 5 58 3 13 32 18 68 -45 36 10 16 38 2 29 35 47 6 38 26 29 - 37 0 0 37 40 31 3 13 34 19 69 -44 36 44 44 38 37 7 36 21 33 39 1 9 - 36 0 0 38 14 56 3 13 35 20 70 -44 37 19 6 39 11 37 36 55 53 39 35 41 - 35 0 0 38 49 13 3 13 37 21 70 -43 37 53 19 39 45 58 37 30 5 40 10 3 - 34 0 0 39 23 21 3 13 39 22 71 -42 38 27 23 40 20 8 38 4 8 40 44 15 - 33 0 0 39 57 17 3 13 42 23 72 -41 39 1 17 40 54 7 38 38 0 41 18 15 - 32 0 0 40 31 1 3 13 44 23 73 -40 39 35 0 41 27 53 39 11 42 41 52 2 - 31 0 0 41 4 32 3 13 46 24 73 -40 40 8 29 42 1 25 39 45 11 42 25 35 - 30 0 0 41 37 49 3 13 48 25 74 -39 40 41 45 42 34 43 40 18 26 42 58 52 - 29 0 0 42 10 50 3 13 51 26 75 -38 41 14 46 43 7 44 40 51 27 43 31 54 - 28 0 0 42 43 35 3 13 53 27 76 -37 41 47 31 43 40 28 41 24 13 44 4 38 - 27 0 0 43 16 2 3 13 56 28 77 -36 42 19 59 44 12 55 41 56 41 44 37 4 - 26 0 0 43 48 11 3 13 58 29 78 -35 42 52 10 44 45 2 42 28 52 45 9 10 - 25 0 0 44 20 0 3 14 1 29 79 -35 43 24 1 45 16 49 43 0 44 45 40 56 - 24 0 0 44 51 29 3 14 3 30 80 -34 43 55 33 45 48 15 43 32 18 46 12 22 - 23 0 0 45 22 38 3 14 6 31 80 -33 44 26 45 46 19 20 44 3 30 46 43 25 - 22 0 0 45 53 24 3 14 9 32 81 -32 44 57 35 46 50 3 44 34 22 47 14 6 - 21 0 0 46 23 48 3 14 11 33 82 -31 45 28 3 47 20 22 45 4 52 47 44 23 - 20 0 0 46 53 49 3 14 14 33 83 -31 45 58 8 47 50 18 45 35 0 48 14 16 - 19 0 0 47 23 25 3 14 17 34 84 -30 46 27 51 48 19 49 46 4 44 48 43 45 - 18 0 0 47 52 38 3 14 20 35 85 -29 46 57 9 48 48 55 46 34 4 49 12 49 - 17 0 0 48 21 25 3 14 22 36 87 -28 47 26 3 49 17 36 47 3 1 49 41 26 - 16 0 0 48 49 47 3 14 25 36 88 -27 47 54 31 49 45 50 47 31 32 50 9 38 - 15 0 0 49 17 43 3 14 28 37 89 -27 48 22 34 50 13 39 47 59 38 50 37 23 - 14 0 0 49 45 12 3 14 31 38 90 -26 48 50 12 50 41 0 48 27 19 51 4 41 - 13 0 0 50 12 15 3 14 34 38 91 -25 49 17 23 51 7 55 48 54 33 51 31 32 - 12 0 0 50 38 51 3 14 37 39 92 -24 49 44 7 51 34 22 49 21 21 51 57 55 - 11 0 0 51 5 0 3 14 39 39 93 -24 50 10 25 52 0 21 49 47 42 52 23 50 - 10 0 0 51 30 41 3 14 42 40 94 -23 50 36 15 52 25 52 50 13 36 52 49 18 - 9 0 0 51 55 54 3 14 45 41 96 -22 51 1 38 52 50 56 50 39 3 53 14 17 - 8 0 0 52 20 40 3 14 48 41 97 -21 51 26 33 53 15 31 51 4 3 53 38 47 - 7 0 0 52 44 57 3 14 51 42 98 -21 51 51 1 53 39 38 51 28 35 54 2 50 - 6 0 0 53 8 47 3 14 54 42 99 -20 52 15 1 54 3 17 51 52 39 54 26 24 - 5 0 0 53 32 8 3 14 57 43 101 -19 52 38 33 54 26 27 52 16 15 54 49 29 - 4 0 0 53 55 2 3 14 59 43 102 -19 53 1 38 54 49 9 52 39 24 55 12 6 - 3 0 0 54 17 27 3 15 2 44 103 -18 53 24 14 55 11 23 53 2 5 55 34 15 - 2 0 0 54 39 25 3 15 5 44 104 -17 53 46 23 55 33 8 53 24 19 55 55 56 - 1 0 0 55 0 54 3 15 8 45 106 -17 54 8 4 55 54 26 53 46 4 56 17 8 0 0 0 55 21 56 3 15 11 45 107 -16 54 29 17 56 15 15 54 7 22 56 37 52 1 0 0 55 42 30 3 15 14 46 108 -15 54 50 3 56 35 37 54 28 13 56 58 9 2 0 0 56 2 36 3 15 16 46 110 -15 55 10 21 56 55 31 54 48 36 57 17 58 3 0 0 56 22 15 3 15 19 47 111 -14 55 30 12 57 14 58 55 8 32 57 37 19 4 0 0 56 41 27 3 15 22 47 112 -13 55 49 36 57 33 57 55 28 0 57 56 13 5 0 0 57 0 12 3 15 25 47 114 -13 56 8 32 57 52 30 55 47 2 58 14 40 6 0 0 57 18 30 3 15 27 48 115 -12 56 27 3 58 10 35 56 5 37 58 32 40 7 0 0 57 36 21 3 15 30 48 117 -11 56 45 6 58 28 14 56 23 46 58 50 14 8 0 0 57 53 46 3 15 33 48 118 -11 57 2 43 58 45 27 56 41 28 59 7 21 9 0 0 58 10 45 3 15 35 49 120 -10 57 19 55 59 2 14 56 58 44 59 24 2 10 0 0 58 27 19 3 15 38 49 121 -10 57 36 40 59 18 35 57 15 34 59 40 18 11 0 0 58 43 27 3 15 41 49 122 -9 57 53 0 59 34 30 57 31 59 59 56 8 12 0 0 58 59 9 3 15 43 50 124 -8 58 8 54 59 50 1 57 47 58 60 11 33 13 0 0 59 14 27 3 15 46 50 125 -8 58 24 24 60 5 6 58 3 32 60 26 34 14 0 0 59 29 20 3 15 48 50 127 -7 58 39 28 60 19 47 58 18 42 60 41 9 15 0 0 59 43 49 3 15 51 50 128 -7 58 54 8 60 34 4 58 33 27 60 55 21 16 0 0 59 57 53 3 15 54 51 130 -6 59 8 24 60 47 57 58 47 47 61 9 9 17 0 0 60 11 34 3 15 56 51 131 -6 59 22 17 61 1 26 59 1 44 61 22 33 18 0 0 60 24 51 3 15 59 51 133 -5 59 35 45 61 14 32 59 15 17 61 35 34 19 0 0 60 37 46 3 16 1 51 134 -4 59 48 50 61 27 14 59 28 27 61 48 12 20 0 0 60 50 17 3 16 3 52 136 -4 60 1 32 61 39 35 59 41 13 62 0 27 21 0 0 61 2 25 3 16 6 52 137 -3 60 13 51 61 51 32 59 53 37 62 12 20 22 0 0 61 14 12 3 16 8 52 139 -3 60 25 48 62 3 8 60 5 38 62 23 51 23 0 0 61 25 36 3 16 11 52 140 -2 60 37 22 62 14 21 60 17 16 62 35 0 24 0 0 61 36 38 3 16 13 52 142 -2 60 48 35 62 25 14 60 28 33 62 45 48 25 0 0 61 47 20 3 16 16 52 143 -1 60 59 26 62 35 44 60 39 28 62 56 14 26 0 0 61 57 39 3 16 18 53 145 -1 61 9 55 62 45 54 60 50 1 63 6 20 27 0 0 62 7 38 3 16 20 53 147 0 61 20 4 62 55 44 61 0 13 63 16 5 Uncertainty in time = +/- 1 secs [Prediction of 2008 Apr 28.0] Data for the target star ------------------------ * name: TYC 1856-00666-1 * constellation : Taurus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 29 30.9839 DE: +27 50 37.165 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .015, .015 ) * V mag [mag]: 9.2 * B mag [mag]: 9.5 * Apparent position with proper motion RA(deg): 82.5350487719 DE(deg): 27.8518167622 * Equation of equinoxes (radians) : 0.000069661141469 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (111) Ate approx. diameter [km]: 135 approx. diameter ["]: .078 distance from Earth [AU]: 2.39500 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 902 number of rejected observations: 111 time covered by the observations: 1908 Sep 21 - 2007 Oct 04 1 sigma uncertainty ellipse (major, minor, PA): 0.011, 0.008, 92° remarks: * orbital elements for (111) Ate : Mean anomaly = 315.06819615 deg Arg. of pericenter = 167.13081947 deg Long. of node = 305.79632270 deg Inclination = 4.93132530 deg Eccentricity = 0.10235208 Semimajor axis = 2.59341677 AU Perihelion dist = 2.32797516 AU Mag: H = 8.04, G = 0.15 Epoch of elements : MJD 55079.13700000 TDT (2009 Sep 05.137) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 5 111 Ate 3h 16.9m UT 9.2 5 29 30.984 27 50 37.17TYC 1856-00666-1 9.5 13.0 135 5.7 2.395 3.677 4.66 48.7883 27.843 130.48 6.79 3.2814 -0.05504 0.58706 13.28274 1.27077 -0.00537 -0.00021 2000 312.9119452009 827.00000167.130819305.796323 4.9313250.10235208 2.5934168 2.3279752 8.0 5.00.15 RATE 2.3599110 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.019 0.017 91 1.21 0.017 0 54584.5020090905_0666-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 28, 02:46 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org