IOTA/IOTA-ES occultation update for (98) Ianthe / UCAC2 45820520 event on 2012 Nov 19, 22:48 UT Visible from Russia, SW Asia, Arabia, Africa Summary ------- On 2012 Nov 19 UT, the 104 km diameter asteroid (98) Ianthe will occult a 10.0 mag star in the constellation Lynx for observers along a path across Russia, SW Asia, Arabia, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.1 mag to 13.0 mag (the magnitude of the asteroid) for at most 13.5 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: 98 * date and approx. time of event: 2012 Nov 19, 22:35 - 2012 Nov 19, 22:56 UT * geocentric midpoint of event [JD]: 2456251.45029583 * magnitude of target star: 10.0 * magnitude drop [mag]: 3.1 * estimated maximum duration [s]: 13.5 * Moon: 43 % sunlit, 148° distance * Sun: 116° distance * rough path description: Russia, SW Asia, Arabia, Africa The occultation path -------------------- * approximate projected width [km]: 107 * 1 sigma uncertainty interval [path widths]: +/- 0.34 * 1 sigma uncertainty interval [seconds]: +/- 4.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .035 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .036", .022", 105° ) * approx speed of asteroid's shadow [km/s]: 7.6965 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 45820520 by 98 Ianthe on 2012 Nov 19 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 ' " Longitude Longitude Longitude Longitude 10 51 6 -12 0 0 22 35 6 0 49 -58 11 36 1 ... .. .. 12 6 21 ... .. .. 11 58 59 -11 0 0 22 35 7 2 48 -59 12 43 11 11 14 26 13 13 2 10 43 55 13 5 6 -10 0 0 22 35 8 3 48 -60 13 48 38 12 21 13 14 18 2 11 51 11 14 9 33 - 9 0 0 22 35 9 5 48 -61 14 52 28 13 26 19 15 21 29 12 56 43 15 12 28 - 8 0 0 22 35 11 6 48 -62 15 54 50 14 29 49 16 23 29 14 0 37 16 13 58 - 7 0 0 22 35 14 8 48 -63 16 55 49 15 31 50 17 24 7 15 3 2 17 14 8 - 6 0 0 22 35 17 9 48 -64 17 55 31 16 32 30 18 23 31 16 4 2 18 13 5 - 5 0 0 22 35 20 11 48 -65 18 54 2 17 31 53 19 21 44 17 3 44 19 10 53 - 4 0 0 22 35 25 12 47 -66 19 51 26 18 30 6 20 18 53 18 2 14 20 7 37 - 3 0 0 22 35 29 13 47 -67 20 47 49 19 27 13 21 15 1 18 59 36 21 3 22 - 2 0 0 22 35 34 15 47 -68 21 43 14 20 23 18 22 10 14 19 55 56 21 58 12 - 1 0 0 22 35 39 16 47 -69 22 37 46 21 18 26 23 4 34 20 51 17 22 52 11 0 0 0 22 35 45 17 47 -70 23 31 29 22 12 42 23 58 7 21 45 44 23 45 23 1 0 0 22 35 52 19 47 -70 24 24 26 23 6 8 24 50 54 22 39 21 Latitude Latitude Latitude Latitude 24 0 0 1 16 38 22 35 53 19 48 -70 0 32 12 2 1 20 0 2 8 2 31 54 25 0 0 2 25 34 22 36 1 21 48 -71 1 40 45 3 10 40 1 10 25 3 41 30 26 0 0 3 35 30 22 36 10 22 48 -72 2 50 18 4 20 59 2 19 42 4 52 5 27 0 0 4 46 23 22 36 19 24 48 -72 4 0 48 5 32 14 3 29 57 6 3 35 28 0 0 5 58 8 22 36 29 25 48 -73 5 12 11 6 44 21 4 41 6 7 15 58 29 0 0 7 10 41 22 36 39 27 48 -73 6 24 23 7 57 16 5 53 4 8 29 7 30 0 0 8 23 58 22 36 50 29 49 -73 7 37 20 9 10 53 7 5 48 9 42 58 31 0 0 9 37 53 22 37 2 30 49 -73 8 50 57 10 25 8 8 19 12 10 57 26 32 0 0 10 52 22 22 37 14 32 49 -73 10 5 8 11 39 55 9 33 11 12 12 25 33 0 0 12 7 19 22 37 27 33 50 -73 11 19 48 12 55 8 10 47 39 13 27 50 34 0 0 13 22 36 22 37 41 35 50 -72 12 34 50 14 10 41 12 2 32 14 43 33 35 0 0 14 38 9 22 37 55 36 50 -72 13 50 9 15 26 27 13 17 41 15 59 29 36 0 0 15 53 50 22 38 10 38 51 -71 15 5 39 16 42 21 14 33 3 17 15 31 37 0 0 17 9 34 22 38 25 40 52 -71 16 21 12 17 58 14 15 48 28 18 31 32 38 0 0 18 25 12 22 38 40 41 52 -70 17 36 41 19 14 1 17 3 52 19 47 24 39 0 0 19 40 38 22 38 57 43 53 -69 18 52 1 20 29 34 18 19 7 21 3 2 40 0 0 20 55 46 22 39 13 44 54 -68 20 7 3 21 44 46 19 34 6 22 18 17 41 0 0 22 10 27 22 39 30 46 54 -67 21 21 42 22 59 31 20 48 43 23 33 3 42 0 0 23 24 37 22 39 47 47 55 -66 22 35 51 24 13 41 22 2 51 24 47 13 43 0 0 24 38 7 22 40 4 49 56 -65 23 49 22 25 27 10 23 16 23 26 0 41 44 0 0 25 50 52 22 40 22 50 57 -64 25 2 10 26 39 51 24 29 13 27 13 20 45 0 0 27 2 46 22 40 40 52 58 -63 26 14 9 27 51 39 25 41 15 28 25 5 46 0 0 28 13 42 22 40 58 53 59 -61 27 25 13 29 2 29 26 52 24 29 35 49 47 0 0 29 23 37 22 41 16 55 61 -60 28 35 16 30 12 14 28 2 33 30 45 27 48 0 0 30 32 24 22 41 34 56 62 -59 29 44 14 31 20 49 29 11 38 31 53 55 49 0 0 31 39 59 22 41 52 57 64 -58 30 52 2 32 28 12 30 19 34 33 1 9 50 0 0 32 46 19 22 42 10 59 65 -57 31 58 36 33 34 17 31 26 18 34 7 4 51 0 0 33 51 20 22 42 29 60 67 -56 33 3 53 34 39 2 32 31 45 35 11 37 52 0 0 34 54 59 22 42 46 61 68 -55 34 7 49 35 42 23 33 35 52 36 14 46 53 0 0 35 57 13 22 43 4 62 70 -53 35 10 21 36 44 19 34 38 37 37 16 29 54 0 0 36 58 0 22 43 22 63 72 -52 36 11 28 37 44 46 35 39 57 38 16 42 55 0 0 37 57 20 22 43 40 64 74 -51 37 11 8 38 43 44 36 39 51 39 15 26 56 0 0 38 55 10 22 43 57 65 76 -50 38 9 20 39 41 12 37 38 17 40 12 38 57 0 0 39 51 29 22 44 14 66 79 -49 39 6 2 40 37 9 38 35 14 41 8 19 58 0 0 40 46 18 22 44 31 67 81 -48 40 1 14 41 31 34 39 30 42 42 2 28 59 0 0 41 39 36 22 44 47 68 84 -47 40 54 56 42 24 28 40 24 40 42 55 6 60 0 0 42 31 24 22 45 4 69 87 -46 41 47 8 43 15 51 41 17 8 43 46 12 61 0 0 43 21 42 22 45 20 70 90 -45 42 37 51 44 5 44 42 8 7 44 35 47 62 0 0 44 10 31 22 45 36 71 93 -44 43 27 4 44 54 8 42 57 38 45 23 53 63 0 0 44 57 51 22 45 51 71 96 -43 44 14 50 45 41 3 43 45 41 46 10 31 64 0 0 45 43 45 22 46 6 72 99 -42 45 1 9 46 26 30 44 32 17 46 55 41 65 0 0 46 28 13 22 46 21 73 103 -41 45 46 2 47 10 33 45 17 27 47 39 26 66 0 0 47 11 17 22 46 36 73 106 -40 46 29 32 47 53 11 46 1 13 48 21 46 67 0 0 47 52 58 22 46 50 73 110 -39 47 11 38 48 34 27 46 43 37 49 2 45 68 0 0 48 33 19 22 47 4 74 114 -39 47 52 24 49 14 22 47 24 40 49 42 23 69 0 0 49 12 20 22 47 18 74 118 -38 48 31 51 49 52 59 48 4 23 50 20 42 70 0 0 49 50 5 22 47 31 74 122 -37 49 10 0 50 30 19 48 42 49 50 57 45 71 0 0 50 26 34 22 47 45 75 126 -36 49 46 54 51 6 23 49 19 59 51 33 33 72 0 0 51 1 51 22 47 57 75 130 -35 50 22 34 51 41 15 49 55 55 52 8 8 73 0 0 51 35 55 22 48 10 75 135 -35 50 57 2 52 14 56 50 30 40 52 41 32 74 0 0 52 8 50 22 48 22 75 139 -34 51 30 21 52 47 28 51 4 14 53 13 48 75 0 0 52 40 38 22 48 34 75 143 -33 52 2 31 53 18 52 51 36 40 53 44 57 76 0 0 53 11 20 22 48 46 75 147 -32 52 33 35 53 49 12 52 7 59 54 15 0 77 0 0 53 40 58 22 48 58 75 150 -32 53 3 36 54 18 28 52 38 14 54 44 1 78 0 0 54 9 34 22 49 9 75 154 -31 53 32 33 54 46 42 53 7 27 55 12 1 79 0 0 54 37 11 22 49 20 74 158 -30 54 0 30 55 13 57 53 35 38 55 39 1 80 0 0 55 3 48 22 49 31 74 161 -30 54 27 29 55 40 14 54 2 50 56 5 4 81 0 0 55 29 29 22 49 41 74 165 -29 54 53 30 56 5 35 54 29 5 56 30 11 82 0 0 55 54 15 22 49 52 74 168 -28 55 18 35 56 30 1 54 54 24 56 54 24 83 0 0 56 18 8 22 50 2 73 171 -28 55 42 47 56 53 35 55 18 48 57 17 45 84 0 0 56 41 9 22 50 12 73 174 -27 56 6 7 57 16 17 55 42 20 57 40 14 85 0 0 57 3 20 22 50 21 73 177 -27 56 28 36 57 38 10 56 5 1 58 1 54 86 0 0 57 24 42 22 50 31 73 180 -26 56 50 15 57 59 14 56 26 53 58 22 47 87 0 0 57 45 16 22 50 40 72 182 -25 57 11 7 58 19 32 56 47 56 58 42 53 88 0 0 58 5 5 22 50 50 72 185 -25 57 31 12 58 39 4 57 8 12 59 2 13 89 0 0 58 24 9 22 50 59 71 188 -24 57 50 32 58 57 52 57 27 43 59 20 50 90 0 0 58 42 30 22 51 7 71 190 -24 58 9 8 59 15 57 57 46 30 59 38 45 91 0 0 59 0 9 22 51 16 71 192 -23 58 27 2 59 33 20 58 4 34 59 55 58 92 0 0 59 17 6 22 51 25 70 194 -23 58 44 14 59 50 4 58 21 56 60 12 31 93 0 0 59 33 24 22 51 33 70 196 -22 59 0 46 60 6 7 58 38 37 60 28 25 94 0 0 59 49 3 22 51 41 69 199 -22 59 16 39 60 21 33 58 54 39 60 43 41 95 0 0 60 4 5 22 51 49 69 201 -21 59 31 53 60 36 21 59 10 2 60 58 21 96 0 0 60 18 30 22 51 57 69 202 -21 59 46 31 60 50 33 59 24 48 61 12 24 97 0 0 60 32 19 22 52 5 68 204 -20 60 0 32 61 4 10 59 38 58 61 25 53 98 0 0 60 45 33 22 52 13 68 206 -20 60 13 58 61 17 13 59 52 31 61 38 47 99 0 0 60 58 13 22 52 20 67 208 -19 60 26 49 61 29 41 60 5 30 61 51 8 100 0 0 61 10 20 22 52 28 67 210 -19 60 39 7 61 41 38 60 17 55 62 2 57 101 0 0 61 21 55 22 52 35 67 211 -18 60 50 52 61 53 2 60 29 47 62 14 14 102 0 0 61 32 58 22 52 42 66 213 -18 61 2 5 62 3 55 60 41 7 62 25 1 103 0 0 61 43 30 22 52 49 66 215 -17 61 12 46 62 14 18 60 51 55 62 35 17 104 0 0 61 53 32 22 52 56 65 216 -17 61 22 57 62 24 11 61 2 12 62 45 3 105 0 0 62 3 4 22 53 3 65 218 -16 61 32 38 62 33 34 61 11 59 62 54 21 106 0 0 62 12 7 22 53 10 65 219 -16 61 41 50 62 42 29 61 21 16 63 3 11 107 0 0 62 20 42 22 53 17 64 221 -16 61 50 32 62 50 56 61 30 4 63 11 32 108 0 0 62 28 49 22 53 24 64 222 -15 61 58 47 62 58 56 61 38 23 63 19 27 109 0 0 62 36 29 22 53 30 63 224 -15 62 6 33 63 6 29 61 46 15 63 26 55 110 0 0 62 43 42 22 53 37 63 225 -14 62 13 53 63 13 35 61 53 38 63 33 56 111 0 0 62 50 28 22 53 43 62 227 -14 62 20 45 63 20 15 62 0 35 63 40 32 112 0 0 62 56 48 22 53 50 62 228 -13 62 27 11 63 26 29 62 7 5 63 46 42 113 0 0 63 2 43 22 53 56 62 229 -13 62 33 11 63 32 18 62 13 9 63 52 28 114 0 0 63 8 12 22 54 2 61 231 -13 62 38 46 63 37 43 62 18 46 63 57 49 115 0 0 63 13 17 22 54 8 61 232 -12 62 43 55 63 42 42 62 23 59 64 2 45 116 0 0 63 17 56 22 54 14 60 233 -12 62 48 39 63 47 18 62 28 46 64 7 18 117 0 0 63 22 12 22 54 20 60 235 -11 62 52 58 63 51 29 62 33 8 64 11 27 118 0 0 63 26 3 22 54 27 60 236 -11 62 56 53 63 55 17 62 37 5 64 15 12 119 0 0 63 29 31 22 54 32 59 237 -11 63 0 24 63 58 42 62 40 38 64 18 34 120 0 0 63 32 35 22 54 38 59 238 -10 63 3 30 64 1 43 62 43 46 64 21 34 121 0 0 63 35 15 22 54 44 58 240 -10 63 6 13 64 4 21 62 46 31 64 24 10 122 0 0 63 37 32 22 54 50 58 241 -9 63 8 32 64 6 36 62 48 51 64 26 24 123 0 0 63 39 26 22 54 56 58 242 -9 63 10 28 64 8 28 62 50 48 64 28 15 124 0 0 63 40 57 22 55 2 57 243 -9 63 12 0 64 9 58 62 52 22 64 29 44 125 0 0 63 42 5 22 55 7 57 244 -8 63 13 10 64 11 5 62 53 31 64 30 50 126 0 0 63 42 51 22 55 13 56 246 -8 63 13 55 64 11 50 62 54 18 64 31 34 127 0 0 63 43 13 22 55 19 56 247 -7 63 14 18 64 12 12 62 54 41 64 31 56 128 0 0 63 43 13 22 55 24 55 248 -7 63 14 18 64 12 12 62 54 40 64 31 56 129 0 0 63 42 50 22 55 30 55 249 -7 63 13 54 64 11 49 62 54 16 64 31 34 130 0 0 63 42 4 22 55 36 55 250 -6 63 13 8 64 11 4 62 53 29 64 30 50 131 0 0 63 40 55 22 55 41 54 251 -6 63 11 58 64 9 57 62 52 19 64 29 43 132 0 0 63 39 24 22 55 47 54 253 -5 63 10 25 64 8 27 62 50 45 64 28 14 133 0 0 63 37 30 22 55 52 53 254 -5 63 8 29 64 6 34 62 48 47 64 26 23 134 0 0 63 35 12 22 55 58 53 255 -5 63 6 9 64 4 19 62 46 26 64 24 9 135 0 0 63 32 32 22 56 3 52 256 -4 63 3 26 64 1 41 62 43 41 64 21 33 136 0 0 63 29 28 22 56 9 52 257 -4 63 0 19 63 58 40 62 40 32 64 18 34 137 0 0 63 26 0 22 56 14 52 258 -3 62 56 48 63 55 16 62 36 59 64 15 12 138 0 0 63 22 9 22 56 19 51 259 -3 62 52 53 63 51 28 62 33 2 64 11 27 139 0 0 63 17 54 22 56 25 51 260 -3 62 48 34 63 47 17 62 28 40 64 7 19 140 0 0 63 13 15 22 56 30 50 262 -2 62 43 51 63 42 43 62 23 53 64 2 47 141 0 0 63 8 11 22 56 36 50 263 -2 62 38 43 63 37 44 62 18 42 63 57 52 142 0 0 63 2 43 22 56 41 49 264 -1 62 33 9 63 32 21 62 13 5 63 52 32 143 0 0 62 56 50 22 56 46 49 265 -1 62 27 10 63 26 33 62 7 3 63 46 48 144 0 0 62 50 31 22 56 52 49 266 -1 62 20 46 63 20 21 62 0 34 63 40 40 145 0 0 62 43 47 22 56 57 48 267 0 62 13 55 63 13 43 61 53 39 63 34 6 Uncertainty in time = +/- 6 secs Prediction of 2012 Nov 16.0 Data for the target star ------------------------ * name: UCAC2 45820520 * constellation : Lynx * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 31 23.2252 DE: +40 14 10.890 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .019 ) * V mag [mag]: 10.0 * 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 ["]: .082 distance from Earth [AU]: 1.74300 * 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): 0.027, 0.012, 117° remarks: * orbital elements for (98) Ianthe : Mean anomaly = 320.69269230 deg Arg. of pericenter = 158.37179267 deg Long. of node = 354.02651850 deg Inclination = 15.57586953 deg Eccentricity = 0.18598079 Semimajor axis = 2.68853378 AU Perihelion dist = 2.18851815 AU Mag: H = 8.75, G = 0.15 Epoch of elements : MJD 56250.95000000 TDT (2012 Nov 19.950) ------ occelmnt file for Occult BEGIN ----------------------------------- 2012 Nov 19 98 Ianthe 22h 48.4m UT 10.0 8 31 23.225 40 14 10.89UCAC2 45820520 0.0 13.0 104 13.5 1.743 1.645 11.20 86.3761 40.234 -165.70 -19.72 22.8071 -0.13080 0.21522 3.73523 2.21796 -0.00511 0.00039 2000 320.48029220121119.00000158.371793354.026519 15.5758700.18598079 2.6885338 2.1885181 8.8 5.00.15 RATE 2.2357890 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.036 0.022 105 1.34 0.028 0 0 2 0 056247.0020121119_820520 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2012 Jul 10, 02:39 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org