IOTA/IOTA-ES occultation update for (98) Ianthe / TYC 2973-00209-1 event on 2012 Oct 23, 07:42 UT Visible from E Canada, USA, Mexico Summary ------- On 2012 Oct 23 UT, the 104 km diameter asteroid (98) Ianthe will occult a 11.7 mag star in the constellation Lynx for observers along a path across E Canada, USA, Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.0 mag to 13.5 mag (the magnitude of the asteroid) for at most 6.1 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: 98 * date and approx. time of event: 2012 Oct 23, 07:37 - 2012 Oct 23, 07:44 UT * geocentric midpoint of event [JD]: 2456223.82151667 * magnitude of target star: 11.7 * magnitude drop [mag]: 2.0 * estimated maximum duration [s]: 6.1 * Moon: 63 % sunlit, 149° distance * Sun: 95° distance * rough path description: E Canada, USA, Mexico The occultation path -------------------- * approximate projected width [km]: 114 * 1 sigma uncertainty interval [path widths]: +/- 0.37 * 1 sigma uncertainty interval [seconds]: +/- 2.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .030 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .025", 101° ) * approx speed of asteroid's shadow [km/s]: 17.0761 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2973-00209-1 by 98 Ianthe on 2012 Oct 23 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 -125 0 0 12 22 19 7 37 18 0 50 -83 11 42 0 13 2 55 .. .. .. 13 33 9 -124 0 0 13 11 48 7 37 19 2 51 -84 12 31 16 13 52 37 12 1 27 14 23 1 -123 0 0 14 1 45 7 37 19 3 51 -85 13 21 0 14 42 47 12 51 2 15 13 21 -122 0 0 14 52 8 7 37 20 4 51 -85 14 11 10 15 33 23 13 41 3 16 4 6 -121 0 0 15 42 54 7 37 20 6 51 -85 15 1 45 16 24 22 14 31 28 16 55 15 -120 0 0 16 34 3 7 37 21 7 52 -85 15 52 41 17 15 42 15 22 17 17 46 44 -119 0 0 17 25 31 7 37 23 8 52 -84 16 43 58 18 7 22 16 13 25 18 38 33 -118 0 0 18 17 16 7 37 24 9 52 -83 17 35 32 18 59 19 17 4 51 19 30 38 -117 0 0 19 9 16 7 37 26 11 53 -82 18 27 22 19 51 29 17 56 33 20 22 57 -116 0 0 20 1 29 7 37 27 12 53 -81 19 19 24 20 43 52 18 48 28 21 15 27 -115 0 0 20 53 51 7 37 30 13 53 -80 20 11 37 21 36 24 19 40 34 22 8 6 -114 0 0 21 46 20 7 37 32 15 54 -79 21 3 57 22 29 2 20 32 48 23 0 51 -113 0 0 22 38 54 7 37 34 16 54 -78 21 56 23 23 21 45 21 25 7 23 53 40 -112 0 0 23 31 29 7 37 37 17 55 -77 22 48 51 24 14 28 22 17 30 24 46 29 -111 0 0 24 24 4 7 37 39 18 55 -75 23 41 18 25 7 10 23 9 52 25 39 17 -110 0 0 25 16 35 7 37 42 20 56 -74 24 33 43 25 59 47 24 2 12 26 31 59 -109 0 0 26 9 0 7 37 46 21 56 -73 25 26 2 26 52 18 24 54 27 27 24 33 -108 0 0 27 1 15 7 37 49 22 57 -72 26 18 12 27 44 38 25 46 34 28 16 57 -107 0 0 27 53 18 7 37 52 23 57 -71 27 10 12 28 36 45 26 38 30 29 9 8 -106 0 0 28 45 7 7 37 56 25 58 -69 28 1 57 29 28 37 27 30 13 30 1 3 -105 0 0 29 36 39 7 38 0 26 58 -68 28 53 26 30 20 12 28 21 40 30 52 39 -104 0 0 30 27 50 7 38 4 27 59 -67 29 44 36 31 11 25 29 12 49 31 43 53 -103 0 0 31 18 39 7 38 8 28 60 -66 30 35 24 32 2 15 30 3 37 32 34 44 -102 0 0 32 9 4 7 38 12 29 60 -64 31 25 49 32 52 39 30 54 1 33 25 8 -101 0 0 32 59 1 7 38 16 30 61 -63 32 15 46 33 42 35 31 43 59 34 15 3 -100 0 0 33 48 28 7 38 20 32 62 -62 33 5 15 34 32 1 32 33 29 35 4 28 - 99 0 0 34 37 23 7 38 25 33 63 -61 33 54 13 35 20 54 33 22 29 35 53 19 - 98 0 0 35 25 45 7 38 29 34 63 -60 34 42 38 36 9 12 34 10 56 36 41 35 - 97 0 0 36 13 31 7 38 34 35 64 -59 35 30 28 36 56 54 34 58 49 37 29 13 - 96 0 0 37 0 39 7 38 39 36 65 -58 36 17 41 37 43 57 35 46 5 38 16 13 - 95 0 0 37 47 8 7 38 43 37 66 -56 37 4 15 38 30 20 36 32 44 39 2 32 - 94 0 0 38 32 56 7 38 48 38 67 -55 37 50 10 39 16 2 37 18 43 39 48 8 - 93 0 0 39 18 2 7 38 53 39 68 -54 38 35 22 40 1 0 38 4 0 40 33 1 - 92 0 0 40 2 24 7 38 58 40 69 -53 39 19 52 40 45 14 38 48 36 41 17 9 - 91 0 0 40 46 1 7 39 3 41 70 -52 40 3 38 41 28 43 39 32 27 42 0 31 - 90 0 0 41 28 52 7 39 8 42 71 -51 40 46 38 42 11 25 40 15 34 42 43 6 - 89 0 0 42 10 56 7 39 13 43 72 -50 41 28 52 42 53 19 40 57 55 43 24 53 - 88 0 0 42 52 13 7 39 18 44 73 -49 42 10 19 43 34 26 41 39 29 44 5 52 - 87 0 0 43 32 42 7 39 23 45 74 -48 42 50 58 44 14 44 42 20 17 44 46 1 - 86 0 0 44 12 22 7 39 28 46 75 -47 43 30 50 44 54 12 43 0 16 45 25 21 - 85 0 0 44 51 13 7 39 33 47 77 -46 44 9 52 45 32 51 43 39 27 46 3 51 - 84 0 0 45 29 15 7 39 38 47 78 -45 44 48 6 46 10 40 44 17 49 46 41 31 - 83 0 0 46 6 26 7 39 43 48 79 -44 45 25 30 46 47 40 44 55 23 47 18 21 - 82 0 0 46 42 49 7 39 48 49 80 -43 46 2 5 47 23 49 45 32 7 47 54 20 - 81 0 0 47 18 21 7 39 53 50 82 -42 46 37 51 47 59 8 46 8 2 48 29 30 - 80 0 0 47 53 4 7 39 58 51 83 -41 47 12 47 48 33 38 46 43 8 49 3 49 - 79 0 0 48 26 58 7 40 3 51 84 -40 47 46 54 49 7 17 47 17 25 49 37 18 - 78 0 0 49 0 3 7 40 8 52 86 -40 48 20 13 49 40 8 47 50 54 50 9 58 - 77 0 0 49 32 18 7 40 13 53 87 -39 48 52 42 50 12 9 48 23 34 50 41 49 - 76 0 0 50 3 46 7 40 17 53 88 -38 49 24 24 50 43 22 48 55 25 51 12 51 - 75 0 0 50 34 25 7 40 22 54 90 -37 49 55 18 51 13 47 49 26 29 51 43 5 - 74 0 0 51 4 17 7 40 27 55 91 -36 50 25 24 51 43 25 49 56 46 52 12 32 - 73 0 0 51 33 22 7 40 32 55 93 -35 50 54 43 52 12 15 50 26 16 52 41 11 - 72 0 0 52 1 41 7 40 36 56 95 -35 51 23 16 52 40 19 50 54 59 53 9 4 - 71 0 0 52 29 14 7 40 41 56 96 -34 51 51 4 53 7 38 51 22 57 53 36 12 - 70 0 0 52 56 2 7 40 45 57 98 -33 52 18 6 53 34 11 51 50 10 54 2 34 - 69 0 0 53 22 6 7 40 50 57 99 -32 52 44 24 54 0 0 52 16 38 54 28 12 - 68 0 0 53 47 26 7 40 54 58 101 -32 53 9 58 54 25 6 52 42 23 54 53 7 - 67 0 0 54 12 3 7 40 59 59 103 -31 53 34 49 54 49 29 53 7 24 55 17 19 - 66 0 0 54 35 57 7 41 3 59 104 -30 53 58 58 55 13 9 53 31 43 55 40 49 - 65 0 0 54 59 11 7 41 7 59 106 -30 54 22 25 55 36 8 53 55 21 56 3 38 - 64 0 0 55 21 43 7 41 12 60 108 -29 54 45 11 55 58 27 54 18 17 56 25 46 - 63 0 0 55 43 36 7 41 16 60 110 -28 55 7 17 56 20 6 54 40 33 56 47 14 - 62 0 0 56 4 49 7 41 20 61 111 -28 55 28 44 56 41 5 55 2 9 57 8 4 - 61 0 0 56 25 24 7 41 24 61 113 -27 55 49 32 57 1 27 55 23 7 57 28 15 - 60 0 0 56 45 21 7 41 28 61 115 -26 56 9 42 57 21 11 55 43 26 57 47 49 - 59 0 0 57 4 41 7 41 32 62 117 -26 56 29 15 57 40 17 56 3 8 58 6 46 - 58 0 0 57 23 24 7 41 36 62 119 -25 56 48 11 57 58 48 56 22 13 58 25 7 - 57 0 0 57 41 32 7 41 40 62 121 -24 57 6 31 58 16 44 56 40 43 58 42 53 - 56 0 0 57 59 5 7 41 44 63 122 -24 57 24 16 58 34 5 56 58 37 59 0 5 - 55 0 0 58 16 4 7 41 48 63 124 -23 57 41 27 58 50 51 57 15 56 59 16 43 - 54 0 0 58 32 29 7 41 52 63 126 -23 57 58 4 59 7 5 57 32 41 59 32 48 - 53 0 0 58 48 22 7 41 56 64 128 -22 58 14 8 59 22 46 57 48 54 59 48 20 - 52 0 0 59 3 42 7 41 59 64 130 -21 58 29 39 59 37 55 58 4 33 60 3 21 - 51 0 0 59 18 31 7 42 3 64 132 -21 58 44 38 59 52 33 58 19 40 60 17 50 - 50 0 0 59 32 49 7 42 7 64 134 -20 58 59 7 60 6 40 58 34 16 60 31 49 - 49 0 0 59 46 36 7 42 11 64 136 -20 59 13 4 60 20 17 58 48 22 60 45 19 - 48 0 0 59 59 54 7 42 14 65 138 -19 59 26 32 60 33 24 59 1 56 60 58 19 - 47 0 0 60 12 42 7 42 18 65 140 -19 59 39 30 60 46 3 59 15 2 61 10 50 - 46 0 0 60 25 2 7 42 21 65 142 -18 59 51 59 60 58 13 59 27 38 61 22 53 - 45 0 0 60 36 54 7 42 25 65 144 -18 60 4 0 61 9 56 59 39 45 61 34 29 - 44 0 0 60 48 18 7 42 28 65 146 -17 60 15 33 61 21 11 59 51 25 61 45 37 - 43 0 0 60 59 15 7 42 32 65 148 -17 60 26 39 61 31 59 60 2 37 61 56 19 - 42 0 0 61 9 45 7 42 35 65 150 -16 60 37 17 61 42 21 60 13 21 62 6 35 - 41 0 0 61 19 49 7 42 38 66 152 -16 60 47 30 61 52 18 60 23 39 62 16 25 - 40 0 0 61 29 28 7 42 42 66 154 -15 60 57 16 62 1 48 60 33 31 62 25 50 - 39 0 0 61 38 41 7 42 45 66 156 -15 61 6 36 62 10 54 60 42 57 62 34 50 - 38 0 0 61 47 30 7 42 48 66 158 -14 61 15 32 62 19 36 60 51 58 62 43 26 - 37 0 0 61 55 54 7 42 51 66 160 -14 61 24 3 62 27 53 61 0 33 62 51 38 - 36 0 0 62 3 53 7 42 55 66 162 -13 61 32 9 62 35 46 61 8 44 62 59 26 - 35 0 0 62 11 29 7 42 58 66 164 -13 61 39 51 62 43 16 61 16 31 63 6 51 - 34 0 0 62 18 42 7 43 1 66 166 -12 61 47 10 62 50 22 61 23 54 63 13 54 - 33 0 0 62 25 32 7 43 4 66 168 -12 61 54 5 62 57 6 61 30 53 63 20 33 - 32 0 0 62 31 58 7 43 7 66 170 -11 62 0 37 63 3 27 61 37 29 63 26 51 - 31 0 0 62 38 3 7 43 11 66 172 -11 62 6 46 63 9 27 61 43 42 63 32 46 - 30 0 0 62 43 45 7 43 14 66 174 -10 62 12 33 63 15 4 61 49 33 63 38 20 - 29 0 0 62 49 5 7 43 17 66 176 -10 62 17 57 63 20 19 61 55 0 63 43 32 - 28 0 0 62 54 3 7 43 20 66 178 -9 62 23 0 63 25 13 62 0 6 63 48 23 - 27 0 0 62 58 40 7 43 23 65 180 -9 62 27 40 63 29 46 62 4 49 63 52 53 - 26 0 0 63 2 55 7 43 26 65 182 -9 62 31 59 63 33 58 62 9 11 63 57 2 - 25 0 0 63 6 49 7 43 29 65 184 -8 62 35 57 63 37 49 62 13 11 64 0 50 - 24 0 0 63 10 23 7 43 32 65 186 -8 62 39 33 63 41 20 62 16 49 64 4 18 - 23 0 0 63 13 35 7 43 35 65 188 -7 62 42 49 63 44 29 62 20 7 64 7 26 - 22 0 0 63 16 27 7 43 38 65 190 -7 62 45 43 63 47 19 62 23 3 64 10 14 - 21 0 0 63 18 59 7 43 41 65 192 -6 62 48 17 63 49 48 62 25 38 64 12 42 - 20 0 0 63 21 10 7 43 44 65 194 -6 62 50 30 63 51 57 62 27 52 64 14 49 - 19 0 0 63 23 1 7 43 47 65 195 -5 62 52 22 63 53 47 62 29 46 64 16 37 - 18 0 0 63 24 31 7 43 50 64 197 -5 62 53 54 63 55 16 62 31 18 64 18 6 - 17 0 0 63 25 42 7 43 53 64 199 -5 62 55 5 63 56 25 62 32 31 64 19 14 - 16 0 0 63 26 32 7 43 55 64 201 -4 62 55 56 63 57 15 62 33 22 64 20 3 - 15 0 0 63 27 2 7 43 58 64 203 -4 62 56 27 63 57 45 62 33 53 64 20 33 - 14 0 0 63 27 12 7 44 1 64 204 -3 62 56 37 63 57 55 62 34 3 64 20 43 - 13 0 0 63 27 2 7 44 4 64 206 -3 62 56 27 63 57 45 62 33 53 64 20 33 - 12 0 0 63 26 32 7 44 7 63 208 -2 62 55 57 63 57 15 62 33 23 64 20 4 - 11 0 0 63 25 43 7 44 10 63 210 -2 62 55 6 63 56 26 62 32 31 64 19 15 - 10 0 0 63 24 32 7 44 13 63 211 -2 62 53 55 63 55 17 62 31 20 64 18 7 - 9 0 0 63 23 2 7 44 16 63 213 -1 62 52 23 63 53 48 62 29 47 64 16 39 - 8 0 0 63 21 12 7 44 19 63 215 -1 62 50 31 63 52 0 62 27 54 64 14 52 - 7 0 0 63 19 1 7 44 22 62 216 0 62 48 19 63 49 51 62 25 40 64 12 44 Uncertainty in time = +/- 3 secs Prediction of 2012 Aug 26.0 Data for the target star ------------------------ * name: TYC 2973-00209-1 * constellation : Lynx * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 02 26.9588 DE: +38 41 47.646 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .023 ) * V mag [mag]: 11.7 * B mag [mag]: 12.1 * Apparent position with proper motion RA(deg): 120.8298389414 DE(deg): 38.6564205532 * Equation of equinoxes (radians) : 0.000060639089542 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (98) Ianthe approx. diameter [km]: 104 approx. diameter ["]: .069 distance from Earth [AU]: 2.09200 * orbital information: orbit source: Preston date of fit: 2012 Jul 10 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 983 number of rejected observations: 47 time covered by the observations: 1927 Aug 30 - 2012 Feb 02 1 sigma uncertainty ellipse (major, minor, PA): 0.022, 0.010, 112° remarks: * orbital elements for (98) Ianthe : Mean anomaly = 314.53247987 deg Arg. of pericenter = 158.35236628 deg Long. of node = 354.03082006 deg Inclination = 15.57569123 deg Eccentricity = 0.18603455 Semimajor axis = 2.68876139 AU Perihelion dist = 2.18855889 AU Mag: H = 8.75, G = 0.15 Epoch of elements : MJD 56223.32100000 TDT (2012 Oct 23.321) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Oct 23 98 Ianthe 7h 43.0m UT 11.7 8 2 26.959 38 41 47.65TYC 2973-00209-1 12.1 13.5 104 6.1 2.092 3.424 5.93 -27.2653 38.695 60.34 -11.58 7.7164 -0.06175 0.39898 9.53462 1.40958 -0.00552 0.00102 2000 313.79006920121020.00000158.352366354.030820 15.5756910.18603455 2.6887614 2.1885589 8.8 5.00.15 RATE 2.2355050 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.025 101 1.37 0.026 0 0-2-4 056165.0020121023_0209-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Aug 26, 05:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org