IOTA/IOTA-ES occultation update for (98) Ianthe / 2UCAC 46139663 event on 2012 Nov 30, 08:32 UT Visible from W Canada, W USA Summary ------- On 2012 Nov 30 UT, the 104 km diameter asteroid (98) Ianthe will occult a 13.3 mag star in the constellation Lynx for observers along a path across W Canada, W USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.5 mag to 12.7 mag (the magnitude of the asteroid) for at most 20.6 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: 94 * date and approx. time of event: 2012 Nov 30, 08:15 - 2012 Nov 30, 08:48 UT * geocentric midpoint of event [JD]: 2456261.8555875 * magnitude of target star: 13.3 * magnitude drop [mag]: 0.5 * estimated maximum duration [s]: 20.6 * Moon: 97 % sunlit, 41° distance * Sun: 125° distance * rough path description: W Canada, W USA The occultation path -------------------- * approximate projected width [km]: 130 * 1 sigma uncertainty interval [path widths]: +/- 0.45 * 1 sigma uncertainty interval [seconds]: +/- 7.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .040 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .040", .036", 104° ) * approx speed of asteroid's shadow [km/s]: 5.0655 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 46139663 by 98 Ianthe on 2012 Nov 30 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude -134 46 35 -10 51 8 8 15 31 7 46 -57 -137 11 59 -12 38 10 -133 2 47 - 9 41 58 ... .. .. .. .. .. -131 44 24 - 8 53 30 -131 28 46 - 6 32 5 8 15 57 12 45 -61 -132 45 38 - 7 16 29 -130 18 44 - 5 54 2 -134 3 13 - 8 4 13 -129 20 4 - 5 23 53 -129 28 24 - 3 25 36 8 16 22 16 45 -65 -130 30 40 - 3 56 22 -128 29 26 - 2 57 58 -131 30 11 - 4 27 20 -127 38 43 - 2 35 21 -127 58 57 - 0 48 46 8 16 48 19 46 -67 -128 54 12 - 1 12 49 -127 5 48 - 0 26 45 -129 45 59 - 1 36 29 -126 19 31 - 0 8 27 -126 47 21 1 30 38 8 17 13 22 46 -70 -127 38 22 1 10 43 -125 57 49 1 49 3 -128 25 45 0 51 21 -125 14 24 2 4 28 -125 47 40 3 38 13 8 17 39 24 46 -72 -126 35 53 3 21 9 -125 0 38 3 54 5 -127 20 23 3 4 40 -124 19 13 4 7 26 -124 56 43 5 37 4 8 18 4 26 47 -74 -125 42 55 5 22 7 -124 11 27 5 51 2 -126 25 24 5 7 44 -123 31 29 6 2 48 -124 12 27 7 29 11 8 18 29 28 47 -75 -124 57 11 7 15 51 -123 28 32 7 41 39 -125 38 12 7 3 4 -122 49 38 7 52 10 -123 33 34 9 15 52 8 18 55 30 48 -77 -124 17 12 9 3 50 -122 50 39 9 27 7 -124 57 6 8 52 19 -122 12 35 9 36 38 -122 59 7 10 58 3 8 19 20 31 48 -78 -123 41 54 10 47 6 -122 16 58 11 8 19 -124 20 58 10 36 37 -121 39 32 11 17 0 -122 28 25 12 36 29 8 19 46 33 49 -79 -123 10 33 12 26 25 -121 46 51 12 45 55 -123 48 58 12 16 48 -121 9 54 12 53 53 -122 0 57 14 11 41 8 20 11 34 50 -81 -122 42 35 14 2 22 -121 19 49 14 20 24 -123 20 32 13 53 28 -120 43 13 14 27 46 -121 36 18 15 44 5 8 20 36 36 50 -81 -122 17 35 15 35 25 -120 55 30 15 52 11 -122 55 9 15 27 8 -120 19 10 15 59 2 -121 14 11 17 14 2 8 21 2 37 51 -82 -121 55 12 17 5 56 -120 33 36 17 21 37 -122 32 31 16 58 11 -119 57 26 17 28 0 -120 54 19 18 41 50 8 21 27 38 52 -82 -121 35 10 18 34 13 -120 13 53 18 48 56 -122 12 18 18 26 56 -119 37 49 18 54 56 -120 36 31 20 7 42 8 21 53 39 53 -82 -121 17 16 20 0 32 -119 56 9 20 14 24 -121 54 19 19 53 39 -119 20 8 20 20 2 -120 20 36 21 31 51 8 22 18 40 54 -82 -121 1 21 21 25 4 -119 40 14 21 38 12 -121 38 20 21 18 32 -119 4 13 21 43 31 -120 6 27 22 54 28 8 22 44 41 55 -82 -120 47 14 22 48 0 -119 26 2 23 0 29 -121 24 15 22 41 48 -118 49 57 23 5 31 -119 53 57 24 15 41 8 23 9 42 56 -81 -120 34 49 24 9 31 -119 13 25 24 21 24 -121 11 55 24 3 36 -118 37 13 24 26 12 -119 43 0 25 35 38 8 23 34 43 57 -81 -120 24 1 25 29 45 -119 2 18 25 41 6 -121 1 14 25 24 4 -118 25 58 25 45 40 -119 33 32 26 54 27 8 24 0 44 58 -80 -120 14 45 26 48 47 -118 52 38 26 59 41 -120 52 8 26 43 20 -118 16 6 27 4 3 -119 25 30 28 12 12 8 24 25 45 59 -79 -120 6 58 28 6 46 -118 44 21 28 17 15 -120 44 33 28 1 30 -118 7 34 28 21 26 -119 18 50 29 29 1 8 24 51 46 60 -78 -120 0 35 29 23 46 -118 37 23 29 33 52 -120 38 26 29 18 40 -118 0 20 29 37 54 -119 13 31 30 44 58 8 25 16 47 61 -77 -119 55 36 30 39 52 -118 31 44 30 49 39 -120 33 45 30 34 56 -117 54 22 30 53 33 -119 9 32 32 0 7 8 25 41 47 62 -76 -119 51 59 31 55 10 -118 27 21 32 4 40 -120 30 27 31 50 22 -117 49 39 32 8 25 -119 6 50 33 14 32 8 26 7 48 63 -75 -119 49 43 33 9 43 -118 24 14 33 18 57 -120 28 34 33 5 2 -117 46 9 33 22 36 -119 5 27 34 28 17 8 26 32 49 65 -74 -119 48 47 34 23 35 -118 22 23 34 32 36 -120 28 3 34 18 59 -117 43 52 34 36 9 -119 5 21 35 41 26 8 26 58 49 66 -73 -119 49 12 35 36 49 -118 21 47 35 45 39 -120 28 55 35 32 19 -117 42 48 35 49 8 -119 6 35 36 54 1 8 27 23 50 67 -72 -119 50 59 36 49 29 -118 22 27 36 58 10 -120 31 11 36 45 3 -117 42 58 37 1 34 -119 9 9 38 6 6 8 27 49 50 69 -71 -119 54 9 38 1 38 -118 24 25 38 10 11 -120 34 53 37 57 15 -117 44 23 38 13 32 -119 13 4 39 17 43 8 28 14 51 70 -70 -119 58 43 39 13 17 -118 27 42 39 21 46 -120 40 2 39 8 57 -117 47 5 39 25 3 -119 18 24 40 28 55 8 28 39 51 71 -69 -120 4 45 40 24 31 -118 32 19 40 32 55 -120 46 41 40 20 12 -117 51 5 40 36 11 -119 25 11 41 39 43 8 29 5 52 73 -68 -120 12 16 41 35 20 -118 38 21 41 43 42 -120 54 53 41 31 2 -117 56 26 41 46 57 -119 33 28 42 50 11 8 29 30 52 74 -67 -120 21 22 42 45 48 -118 45 50 42 54 10 -121 4 42 42 41 30 -118 3 12 42 57 24 -119 43 20 44 0 19 8 29 56 52 76 -66 -120 32 5 43 55 55 -118 54 50 44 4 19 -121 16 11 43 51 36 -118 11 25 44 7 33 -119 54 51 45 10 11 8 30 21 52 77 -65 -120 44 32 45 5 45 -119 5 26 45 14 11 -121 29 28 45 1 23 -118 21 11 45 17 27 -120 8 8 46 19 46 8 30 47 52 79 -64 -120 58 47 46 15 17 -119 17 43 46 23 49 -121 44 37 46 10 53 -118 32 35 46 27 7 -120 23 16 47 29 8 8 31 12 53 80 -63 -121 14 59 47 24 35 -119 31 48 47 33 14 -122 1 45 47 20 7 -118 45 42 47 36 35 -120 40 23 48 38 17 8 31 37 53 81 -62 -121 33 14 48 33 39 -119 47 47 48 42 28 -122 21 1 48 29 6 -119 0 40 48 45 51 -120 59 39 49 47 14 8 32 3 53 83 -61 -121 53 42 49 42 30 -120 5 50 49 51 31 -122 42 35 49 37 51 -119 17 37 49 54 59 -121 21 12 50 56 1 8 32 28 53 84 -60 -122 16 33 50 51 9 -120 26 5 51 0 24 -123 6 35 50 46 23 -119 36 42 51 3 58 -121 45 14 52 4 38 8 32 54 53 85 -59 -122 41 59 51 59 38 -120 48 44 52 9 9 -123 33 16 51 54 43 -119 58 5 52 12 50 -122 11 59 53 13 6 8 33 19 52 87 -58 -123 10 14 53 7 55 -121 13 59 53 17 47 -124 2 50 53 2 51 -120 22 0 53 21 36 -122 41 42 54 21 26 8 33 44 52 88 -57 -123 41 32 54 16 3 -121 42 6 54 26 18 -124 35 34 54 10 47 -120 48 39 54 30 16 -123 14 40 55 29 37 8 34 10 52 89 -56 -124 16 13 55 24 1 -122 13 20 55 34 42 -125 11 47 55 18 31 -121 18 20 55 38 51 -123 51 12 56 37 40 8 34 35 52 90 -55 -124 54 36 56 31 48 -122 48 1 56 43 0 -125 51 48 56 26 3 -121 51 21 56 47 21 -124 31 44 57 45 34 8 35 1 51 91 -54 -125 37 5 57 39 24 -123 26 33 57 51 10 -126 36 4 57 33 22 -122 28 4 57 55 45 -125 16 40 58 53 18 8 35 26 51 92 -53 -126 24 9 58 46 47 -124 9 20 58 59 14 -127 25 1 58 40 26 -123 8 54 59 4 5 -126 6 33 60 0 50 8 35 52 51 92 -51 -127 16 19 59 53 56 -124 56 55 60 7 8 -128 19 12 59 47 13 -123 54 22 60 12 18 -127 1 59 61 8 9 8 36 17 50 93 -50 -128 14 12 61 0 49 -125 49 51 61 14 52 -129 19 16 60 53 40 -124 45 3 61 20 23 -128 3 41 62 15 11 8 36 42 50 94 -49 -129 18 32 62 7 21 -126 48 52 62 22 22 -130 25 55 61 59 44 -125 41 36 62 28 18 -129 12 28 63 21 53 8 37 8 49 94 -48 -130 30 9 63 13 28 -127 54 46 63 29 36 -131 40 1 63 5 19 -126 44 52 63 35 59 -130 29 20 64 28 9 8 37 33 49 94 -47 -131 50 2 64 19 5 -129 8 32 64 36 29 -133 2 34 64 10 19 -127 55 46 64 43 23 -131 55 25 65 33 52 8 37 59 48 94 -46 -133 19 21 65 24 4 -130 31 18 65 42 54 -134 34 42 65 14 36 -129 15 27 65 50 25 -133 32 6 66 38 53 8 38 24 47 94 -45 -134 59 27 66 28 15 -132 4 25 66 48 44 -136 17 45 66 18 0 -130 45 16 66 56 55 -135 20 57 67 43 1 8 38 49 46 93 -44 -136 51 54 67 31 25 -133 49 30 67 53 47 -138 13 17 67 20 17 -132 26 50 68 2 46 -137 23 50 68 46 1 8 39 15 46 93 -43 -138 58 31 68 33 20 -135 48 27 68 57 50 -140 23 6 68 21 9 -134 22 3 69 7 44 -139 42 56 69 47 34 8 39 40 45 92 -42 -141 21 26 69 33 37 -138 3 28 70 0 35 -142 49 11 69 20 18 -136 33 11 70 11 32 -142 20 45 70 47 15 8 40 6 44 90 -41 -144 3 0 70 31 53 -140 37 12 71 1 40 -145 33 52 70 17 14 -139 2 56 71 13 49 -145 20 7 71 44 34 8 40 31 43 88 -39 -147 5 54 71 27 34 -143 32 37 72 0 34 -148 39 35 71 11 26 -141 54 25 72 14 6 -148 44 5 72 38 51 8 40 57 42 86 -38 -150 32 54 72 20 1 -146 53 2 72 56 39 -152 8 55 72 2 11 -145 11 12 73 11 47 -152 35 51 73 29 17 8 41 22 41 83 -37 -154 26 51 73 8 22 -150 42 1 73 49 8 -156 4 20 72 48 39 -148 57 10 74 6 6 -156 58 22 74 14 51 8 41 47 40 80 -36 -158 50 11 73 51 37 -155 3 4 74 37 1 -160 27 54 73 29 49 -153 16 17 74 56 1 -161 53 52 74 54 20 8 42 13 39 76 -35 -163 44 33 74 28 34 -159 59 4 75 19 2 -165 20 46 74 4 30 -158 12 5 75 40 20 -167 23 8 75 26 17 8 42 38 38 72 -33 -169 10 5 74 57 48 -165 31 32 75 53 44 -170 42 34 74 31 19 -163 46 52 76 17 33 -173 24 32 75 49 8 8 43 4 36 67 -32 -175 4 37 75 17 49 -171 39 30 76 19 28 -176 30 46 74 48 49 -170 0 24 76 45 55 -179 53 12 76 1 13 8 43 29 35 61 -31 178 36 55 75 27 3 -178 18 28 76 34 28 177 19 46 74 55 33 -176 48 40 77 3 36 173 19 14 76 0 58 8 43 54 34 55 -30 172 2 33 75 24 3 174 40 9 76 37 2 170 56 45 74 50 6 175 57 2 77 8 47 166 24 4 75 47 2 8 44 20 32 49 -28 165 22 40 75 7 32 167 28 38 76 25 44 164 29 47 74 31 16 168 29 49 76 59 54 159 33 50 75 18 27 8 44 45 31 43 -27 158 48 29 74 36 35 160 21 1 75 59 32 158 9 1 73 58 9 161 5 18 76 35 50 153 0 15 74 34 34 8 45 11 29 37 -25 152 30 19 73 50 29 153 30 39 75 17 47 152 3 38 73 10 0 153 58 31 75 55 58 146 52 20 73 34 57 8 45 36 27 32 -24 146 36 1 72 48 42 147 7 53 74 20 11 146 20 40 72 6 8 147 21 13 75 0 5 141 15 34 72 19 8 8 46 2 26 27 -22 141 10 26 71 30 34 141 18 58 73 6 28 141 4 25 70 45 41 141 20 29 73 48 5 136 12 3 70 46 14 8 46 27 23 23 -21 136 15 28 69 54 51 136 6 14 71 36 1 136 16 34 69 7 8 135 58 51 72 19 36 131 41 13 68 54 26 8 46 52 21 19 -19 131 50 36 67 59 18 131 28 58 69 47 29 131 56 39 67 7 40 131 15 25 70 33 37 127 40 39 66 40 6 8 47 18 19 16 -17 127 53 33 65 39 19 127 24 30 67 37 55 128 2 24 64 41 41 127 7 11 68 27 44 124 6 37 63 55 37 8 47 43 16 13 -15 124 20 35 62 45 11 123 48 58 65 1 17 124 29 49 61 36 46 123 29 59 65 57 1 120 53 43 60 22 29 8 48 9 12 10 -12 121 5 11 58 50 58 120 37 20 61 43 48 121 10 20 57 15 43 120 18 54 62 50 33 117 48 29 54 46 45 8 48 34 6 8 -8 117 34 49 50 58 50 117 41 3 57 1 33 ... .. .. .. .. .. 117 27 9 58 37 50 Uncertainty in time = +/- 9 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: 2UCAC 46139663 * constellation : Lynx * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 36 21.3357 DE: +41 05 04.114 * position source: mpos:UCAC4 pm:UCAC4 * standard error: RA,DE ["]: ( .029, .034 ) * V mag [mag]: 13.3 * B mag [mag]: 0.0 * Diameter [mas]: 0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (98) Ianthe approx. diameter [km]: 104 approx. diameter ["]: .088 distance from Earth [AU]: 1.62700 * 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): 0.029, 0.013, 118° remarks: * orbital elements for (98) Ianthe : Mean anomaly = 323.01323688 deg Arg. of pericenter = 158.37893043 deg Long. of node = 354.02516021 deg Inclination = 15.57596281 deg Eccentricity = 0.18596055 Semimajor axis = 2.68844689 AU Perihelion dist = 2.18850183 AU Mag: H = 8.75, G = 0.15 Epoch of elements : MJD 56261.35600000 TDT (2012 Nov 30.356) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 30 98 Ianthe 8h 32.0m UT 13.3 8 36 21.336 41 5 4.112UCAC 46139663 0.0 12.7 104 20.6 1.627 0.713 13.18 -68.5426 41.081 49.19 -21.73 8.5341 -0.51440 0.31578 1.49504 2.43705 -0.00470 -0.00001 2000 322.71004920121129.00000158.378930354.025160 15.5759630.18596055 2.6884469 2.1885018 8.8 5.00.15 RATE 2.2358980 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.040 0.036 104 1.45 0.040 0 0-3 4 056247.0020121130_139663 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 03:56 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org