IOTA/IOTA-ES occultation update for (1055) Tynka / TYC 5595-00879-1 event on 2009 May 04, 17:11 UT Visible from Summary ------- On 2009 May 04 UT, the 13 km diameter asteroid (1055) Tynka will occult a 9.0 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.4 mag to 14.4 mag (the magnitude of the asteroid) for at most 1.5 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: 31 * date and approx. time of event: 2009 May 04, 17:05 - 2009 May 04, 17:17 UT * magnitude of target star: 9.0 * magnitude drop [mag]: 5.4 * estimated maximum duration [s]: 1.5 * Moon: 80 % sunlit, 63° distance * Sun: 167° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 25 * 1 sigma uncertainty interval [path widths]: +/- 2.16 * 1 sigma uncertainty interval [seconds]: +/- 4.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .052", .034", 101° ) * approx speed of asteroid's shadow [km/s]: 8.7628 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5595-00879-1 by 1055 Tynka on 2009 May 4 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 Latitude Latitude Latitude Latitude 78 0 0 72 45 36 17 17 14 6 147 0 72 55 43 72 35 32 73 40 20 71 52 53 79 0 0 72 25 27 17 17 13 6 148 0 72 35 38 72 15 21 73 20 27 71 32 31 80 0 0 72 4 47 17 17 12 6 149 -1 72 15 0 71 54 39 73 0 0 71 11 39 81 0 0 71 43 36 17 17 11 7 150 -1 71 53 51 71 33 25 72 39 1 70 50 17 82 0 0 71 21 53 17 17 9 7 151 -2 71 32 10 71 11 40 72 17 29 70 28 24 83 0 0 70 59 38 17 17 8 8 152 -2 71 9 57 70 49 24 71 55 25 70 6 1 84 0 0 70 36 52 17 17 6 8 153 -3 70 47 13 70 26 37 71 32 47 69 43 7 85 0 0 70 13 35 17 17 4 9 154 -3 70 23 57 70 3 18 71 9 37 69 19 44 86 0 0 69 49 47 17 17 2 9 155 -4 70 0 10 69 39 30 70 45 55 68 55 52 87 0 0 69 25 29 17 17 0 10 156 -4 69 35 52 69 15 11 70 21 41 68 31 30 88 0 0 69 0 41 17 16 58 10 157 -5 69 11 5 68 50 22 69 56 55 68 6 39 89 0 0 68 35 23 17 16 55 11 158 -5 68 45 47 68 25 4 69 31 38 67 41 21 90 0 0 68 9 37 17 16 53 11 159 -5 68 20 1 67 59 18 69 5 52 67 15 35 91 0 0 67 43 23 17 16 50 12 160 -6 67 53 46 67 33 4 68 39 35 66 49 23 92 0 0 67 16 41 17 16 47 12 160 -6 67 27 4 67 6 23 68 12 50 66 22 44 93 0 0 66 49 33 17 16 44 13 161 -7 66 59 55 66 39 16 67 45 37 65 55 41 94 0 0 66 21 59 17 16 41 14 162 -7 66 32 20 66 11 43 67 17 57 65 28 13 95 0 0 65 54 1 17 16 37 14 163 -8 66 4 21 65 43 47 66 49 51 65 0 22 96 0 0 65 25 40 17 16 33 15 164 -8 65 35 58 65 15 27 66 21 21 64 32 9 97 0 0 64 56 57 17 16 29 15 165 -9 65 7 12 64 46 46 65 52 27 64 3 35 98 0 0 64 27 52 17 16 25 16 166 -9 64 38 6 64 17 43 65 23 10 63 34 41 99 0 0 63 58 28 17 16 21 16 167 -10 64 8 39 63 48 21 64 53 33 63 5 29 100 0 0 63 28 46 17 16 16 17 168 -10 63 38 54 63 18 41 64 23 36 62 35 59 101 0 0 62 58 46 17 16 11 18 169 -11 63 8 52 62 48 44 63 53 21 62 6 13 102 0 0 62 28 30 17 16 6 18 170 -11 62 38 33 62 18 32 63 22 50 61 36 12 103 0 0 61 58 1 17 16 1 19 171 -12 62 8 1 61 48 5 62 52 2 61 5 58 104 0 0 61 27 18 17 15 56 19 172 -12 61 37 15 61 17 26 62 21 2 60 35 32 105 0 0 60 56 24 17 15 50 20 173 -13 61 6 17 60 46 35 61 49 49 60 4 55 106 0 0 60 25 20 17 15 44 20 174 -13 60 35 10 60 15 34 61 18 25 59 34 8 107 0 0 59 54 7 17 15 38 21 175 -14 60 3 53 59 44 25 60 46 52 59 3 14 108 0 0 59 22 48 17 15 32 22 176 -14 59 32 30 59 13 9 60 15 11 58 32 13 109 0 0 58 51 23 17 15 25 22 177 -15 59 1 1 58 41 48 59 43 25 58 1 8 110 0 0 58 19 53 17 15 19 23 178 -15 58 29 28 58 10 23 59 11 34 57 29 58 111 0 0 57 48 21 17 15 12 23 179 -16 57 57 52 57 38 55 58 39 39 56 58 46 112 0 0 57 16 48 17 15 5 24 180 -16 57 26 15 57 7 26 58 7 43 56 27 34 113 0 0 56 45 15 17 14 57 24 181 -16 56 54 37 56 35 57 57 35 48 55 56 21 114 0 0 56 13 44 17 14 50 25 182 -17 56 23 2 56 4 29 57 3 53 55 25 11 115 0 0 55 42 15 17 14 42 25 184 -17 55 51 29 55 33 5 56 32 2 54 54 4 116 0 0 55 10 51 17 14 34 26 185 -18 55 20 1 55 1 45 56 0 14 54 23 1 117 0 0 54 39 33 17 14 26 26 186 -18 54 48 38 54 30 30 55 28 32 53 52 3 118 0 0 54 8 21 17 14 18 27 187 -18 54 17 22 53 59 23 54 56 57 53 21 13 119 0 0 53 37 18 17 14 9 27 188 -19 53 46 14 53 28 24 54 25 31 52 50 30 120 0 0 53 6 23 17 14 1 28 189 -19 53 15 16 52 57 34 53 54 13 52 19 57 121 0 0 52 35 40 17 13 52 28 190 -19 52 44 28 52 26 54 53 23 7 51 49 35 122 0 0 52 5 8 17 13 43 28 191 -19 52 13 52 51 56 26 52 52 12 51 19 24 123 0 0 51 34 49 17 13 34 29 192 -20 51 43 29 51 26 11 52 21 30 50 49 25 124 0 0 51 4 44 17 13 25 29 194 -20 51 13 20 50 56 10 51 51 3 50 19 41 125 0 0 50 34 53 17 13 16 29 195 -20 50 43 26 50 26 24 51 20 50 49 50 11 126 0 0 50 5 19 17 13 6 30 196 -20 50 13 47 49 56 53 50 50 54 49 20 57 127 0 0 49 36 1 17 12 57 30 197 -20 49 44 26 49 27 39 50 21 15 48 51 59 128 0 0 49 7 2 17 12 47 30 198 -21 49 15 22 48 58 44 49 51 54 48 23 19 129 0 0 48 38 21 17 12 38 31 199 -21 48 46 38 48 30 6 49 22 53 47 54 57 130 0 0 48 10 0 17 12 28 31 200 -21 48 18 13 48 1 49 48 54 11 47 26 55 131 0 0 47 41 59 17 12 18 31 202 -21 47 50 8 47 33 52 48 25 50 46 59 13 132 0 0 47 14 19 17 12 8 31 203 -21 47 22 25 47 6 16 47 57 51 46 31 51 133 0 0 46 47 2 17 11 58 31 204 -21 46 55 4 46 39 2 47 30 14 46 4 52 134 0 0 46 20 7 17 11 48 31 205 -21 46 28 6 46 12 10 47 3 0 45 38 14 135 0 0 45 53 35 17 11 38 32 206 -21 46 1 31 45 45 42 46 36 10 45 12 0 136 0 0 45 27 28 17 11 28 32 208 -21 45 35 20 45 19 38 46 9 45 44 46 10 137 0 0 45 1 46 17 11 18 32 209 -21 45 9 35 44 53 59 45 43 45 44 20 44 138 0 0 44 36 29 17 11 8 32 210 -21 44 44 14 44 28 45 45 18 10 43 55 43 139 0 0 44 11 38 17 10 57 32 211 -21 44 19 20 44 3 57 44 53 3 43 31 8 140 0 0 43 47 13 17 10 47 32 212 -21 43 54 53 43 39 35 44 28 22 43 6 58 141 0 0 43 23 16 17 10 37 32 213 -20 43 30 53 43 15 41 44 4 8 42 43 16 142 0 0 42 59 46 17 10 27 32 214 -20 43 7 20 42 52 14 43 40 23 42 20 1 143 0 0 42 36 44 17 10 17 32 216 -20 42 44 16 42 29 15 43 17 6 41 57 13 144 0 0 42 14 11 17 10 7 31 217 -20 42 21 40 42 6 44 42 54 19 41 34 54 145 0 0 41 52 7 17 9 57 31 218 -20 41 59 33 41 44 43 42 32 1 41 13 3 146 0 0 41 30 33 17 9 47 31 219 -19 41 37 56 41 23 11 42 10 12 40 51 42 147 0 0 41 9 28 17 9 37 31 220 -19 41 16 49 41 2 9 41 48 54 40 30 50 148 0 0 40 48 54 17 9 27 31 221 -19 40 56 13 40 41 37 41 28 7 40 10 28 149 0 0 40 28 51 17 9 17 31 222 -19 40 36 7 40 21 36 41 7 51 39 50 36 150 0 0 40 9 19 17 9 7 30 223 -18 40 16 33 40 2 6 40 48 7 39 31 15 151 0 0 39 50 18 17 8 57 30 224 -18 39 57 30 39 43 7 40 28 55 39 12 25 152 0 0 39 31 49 17 8 48 30 225 -17 39 38 58 39 24 40 40 10 14 38 54 7 153 0 0 39 13 52 17 8 38 29 226 -17 39 21 0 39 6 45 39 52 6 38 36 20 154 0 0 38 56 27 17 8 29 29 227 -17 39 3 33 38 49 22 39 34 31 38 19 5 155 0 0 38 39 35 17 8 20 29 228 -16 38 46 39 38 32 32 39 17 29 38 2 23 156 0 0 38 23 16 17 8 10 28 229 -16 38 30 19 38 16 15 39 1 1 37 46 13 157 0 0 38 7 31 17 8 1 28 230 -15 38 14 31 38 0 31 38 45 6 37 30 36 158 0 0 37 52 19 17 7 52 27 231 -15 37 59 18 37 45 21 38 29 45 37 15 32 159 0 0 37 37 40 17 7 44 27 232 -14 37 44 38 37 30 44 38 14 59 37 1 2 160 0 0 37 23 36 17 7 35 26 233 -14 37 30 32 37 16 41 38 0 47 36 47 5 161 0 0 37 10 6 17 7 26 26 234 -13 37 17 1 37 3 13 37 47 9 36 33 43 162 0 0 36 57 11 17 7 18 26 235 -13 37 4 4 36 50 19 37 34 7 36 20 54 163 0 0 36 44 50 17 7 10 25 236 -12 36 51 43 36 37 59 37 21 39 36 8 40 164 0 0 36 33 5 17 7 2 24 237 -12 36 39 56 36 26 15 37 9 47 35 57 0 165 0 0 36 21 54 17 6 54 24 237 -11 36 28 44 36 15 5 36 58 31 35 45 55 166 0 0 36 11 19 17 6 46 23 238 -11 36 18 8 36 4 31 36 47 50 35 35 26 167 0 0 36 1 19 17 6 38 23 239 -10 36 8 7 35 54 33 36 37 45 35 25 31 168 0 0 35 51 56 17 6 31 22 240 -9 35 58 43 35 45 10 36 28 16 35 16 12 169 0 0 35 43 8 17 6 24 22 241 -9 35 49 54 35 36 23 36 19 24 35 7 28 170 0 0 35 34 56 17 6 17 21 241 -8 35 41 41 35 28 12 36 11 8 34 59 20 171 0 0 35 27 20 17 6 10 20 242 -7 35 34 5 35 20 37 36 3 29 34 51 48 172 0 0 35 20 21 17 6 3 20 243 -7 35 27 5 35 13 38 35 56 27 34 44 52 173 0 0 35 13 59 17 5 57 19 244 -6 35 20 42 35 7 16 35 50 1 34 38 32 174 0 0 35 8 13 17 5 51 18 244 -5 35 14 56 35 1 31 35 44 13 34 32 49 175 0 0 35 3 4 17 5 45 18 245 -5 35 9 47 34 56 23 35 39 2 34 27 42 176 0 0 34 58 33 17 5 39 17 246 -4 35 5 15 34 51 52 35 34 29 34 23 13 177 0 0 34 54 38 17 5 34 16 246 -3 35 1 21 34 47 57 35 30 33 34 19 19 178 0 0 34 51 21 17 5 28 15 247 -3 34 58 3 34 44 40 35 27 15 34 16 3 179 0 0 34 48 42 17 5 23 15 248 -2 34 55 24 34 42 1 35 24 35 34 13 24 180 0 0 34 46 40 17 5 18 14 248 -1 34 53 22 34 39 59 35 22 32 34 11 23 -179 0 0 34 45 16 17 5 14 13 249 0 34 51 58 34 38 35 35 21 9 34 9 59 Uncertainty in time = +/- 5 secs [Prediction of 2008 Apr 25.0] Data for the target star ------------------------ * name: TYC 5595-00879-1 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 15 32 07.0403 DE: -09 01 45.741 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .022 ) * V mag [mag]: 9.0 * B mag [mag]: 10.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1055) Tynka approx. diameter [km]: 13 approx. diameter ["]: .016 distance from Earth [AU]: 1.14500 * orbital information: orbit source: Preston date of fit: 2008 Apr 24 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 944 number of rejected observations: 73 time covered by the observations: 1902 Oct 23 - 2008 Mar 04 1 sigma uncertainty ellipse (major, minor, PA): 0.048, 0.026, 103° remarks: * orbital elements for (1055) Tynka : Mean anomaly = 289.16824074 deg Arg. of pericenter = 176.39819002 deg Long. of node = 147.20230748 deg Inclination = 5.27333718 deg Eccentricity = 0.20809979 Semimajor axis = 2.19803049 AU Perihelion dist = 1.74062081 AU Mag: H = 11.89, G = 0.15 Epoch of elements : MJD 54955.71600000 TDT (2009 May 04.716) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 May 4 1055 Tynka 17h 11.0m UT 9.0 15 32 7.040- 9 1 45.74TYC 5595-00879-1 10.2 14.4 13 1.5 1.145 -2.381 14.13 112.5607 -9.032 -78.56 16.15 17.1832 0.31555 0.78736 -4.59102 1.83992 -0.00096 -0.00067 2000 287.4394372009 429.00000176.398190147.202307 5.2733370.20809979 2.1980305 1.740620812.0 5.00.15 RATE 3.0245000 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.052 0.034 101 3.16 0.034 0 54581.5020090504_0879-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 25, 06:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org