IOTA/IOTA-ES occultation update for (234) Barbara / 2UCAC 33242426 event on 2008 May 21, 10:18 UT Visible from USA Summary ------- On 2008 May 21 UT, the 44 km diameter asteroid (234) Barbara will occult a 13.0 mag star in the constellation Ophiuchus for observers along a path across USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.4 mag to 12.1 mag (the magnitude of the asteroid) for at most 4.9 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: 57 * date and approx. time of event: 2008 May 21, 10:11 - 2008 May 21, 10:26 UT * magnitude of target star: 13.0 * magnitude drop [mag]: 0.4 * estimated maximum duration [s]: 4.9 * Moon: 98 % sunlit, 31° distance * Sun: 152° distance * rough path description: USA The occultation path -------------------- * approximate projected width [km]: 59 * 1 sigma uncertainty interval [path widths]: +/- 1.10 * 1 sigma uncertainty interval [seconds]: +/- 6.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .057 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .057", .050", 94° ) * approx speed of asteroid's shadow [km/s]: 8.9013 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 33242426 by 234 Barbara on 2008 May 21 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 153 0 0 60 21 51 10 26 42 16 111 0 60 37 51 60 5 54 61 13 17 59 31 4 154 0 0 60 18 42 10 26 40 17 112 0 60 34 43 60 2 45 61 10 11 59 27 53 155 0 0 60 15 20 10 26 38 17 112 -1 60 31 22 59 59 22 61 6 52 59 24 28 156 0 0 60 11 45 10 26 35 17 113 -1 60 27 48 59 55 46 61 3 20 59 20 50 157 0 0 60 7 56 10 26 33 18 114 -2 60 24 0 59 51 56 60 59 34 59 16 58 158 0 0 60 3 53 10 26 30 18 115 -2 60 19 58 59 47 53 60 55 35 59 12 52 159 0 0 59 59 38 10 26 27 19 116 -2 60 15 43 59 43 36 60 51 23 59 8 33 160 0 0 59 55 8 10 26 25 19 117 -3 60 11 15 59 39 5 60 46 57 59 4 0 161 0 0 59 50 25 10 26 22 20 118 -3 60 6 33 59 34 21 60 42 18 58 59 13 162 0 0 59 45 28 10 26 19 20 119 -4 60 1 38 59 29 23 60 37 25 58 54 13 163 0 0 59 40 18 10 26 16 21 120 -4 59 56 28 59 24 11 60 32 19 58 48 58 164 0 0 59 34 54 10 26 13 21 121 -4 59 51 6 59 18 46 60 26 59 58 43 30 165 0 0 59 29 16 10 26 10 22 121 -5 59 45 29 59 13 6 60 21 25 58 37 48 166 0 0 59 23 24 10 26 7 22 122 -5 59 39 39 59 7 13 60 15 38 58 31 52 167 0 0 59 17 18 10 26 3 23 123 -5 59 33 34 59 1 6 60 9 37 58 25 42 168 0 0 59 10 59 10 26 0 23 124 -6 59 27 16 58 54 45 60 3 22 58 19 18 169 0 0 59 4 25 10 25 56 24 125 -6 59 20 44 58 48 10 59 56 53 58 12 40 170 0 0 58 57 38 10 25 53 24 126 -6 59 13 58 58 41 22 59 50 11 58 5 48 171 0 0 58 50 36 10 25 49 25 127 -7 59 6 58 58 34 19 59 43 14 57 58 42 172 0 0 58 43 21 10 25 46 25 128 -7 58 59 44 58 27 2 59 36 4 57 51 21 173 0 0 58 35 51 10 25 42 26 129 -7 58 52 16 58 19 30 59 28 39 57 43 47 174 0 0 58 28 7 10 25 38 26 130 -8 58 44 34 58 11 45 59 21 1 57 35 58 175 0 0 58 20 9 10 25 34 27 131 -8 58 36 38 58 3 45 59 13 8 57 27 55 176 0 0 58 11 57 10 25 30 27 132 -9 58 28 27 57 55 31 59 5 1 57 19 37 177 0 0 58 3 31 10 25 26 28 133 -9 58 20 2 57 47 3 58 56 40 57 11 6 178 0 0 57 54 50 10 25 22 28 134 -9 58 11 23 57 38 21 58 48 4 57 2 20 179 0 0 57 45 54 10 25 17 28 135 -10 58 2 30 57 29 24 58 39 15 56 53 19 180 0 0 57 36 45 10 25 13 29 136 -10 57 53 22 57 20 12 58 30 11 56 44 4 -179 0 0 57 27 21 10 25 8 29 137 -10 57 43 59 57 10 47 58 20 52 56 34 35 -178 0 0 57 17 42 10 25 4 30 138 -11 57 34 23 57 1 6 58 11 20 56 24 51 -177 0 0 57 7 49 10 24 59 30 139 -11 57 24 31 56 51 12 58 1 32 56 14 52 -176 0 0 56 57 42 10 24 54 31 140 -11 57 14 26 56 41 2 57 51 31 56 4 39 -175 0 0 56 47 20 10 24 49 31 141 -12 57 4 6 56 30 39 57 41 14 55 54 12 -174 0 0 56 36 43 10 24 45 32 142 -12 56 53 31 56 20 0 57 30 44 55 43 30 -173 0 0 56 25 52 10 24 39 32 143 -12 56 42 41 56 9 8 57 19 58 55 32 33 -172 0 0 56 14 47 10 24 34 33 144 -13 56 31 38 55 58 0 57 8 58 55 21 22 -171 0 0 56 3 26 10 24 29 33 145 -13 56 20 19 55 46 38 56 57 44 55 9 56 -170 0 0 55 51 52 10 24 24 34 146 -13 56 8 46 55 35 2 56 46 15 54 58 16 -169 0 0 55 40 2 10 24 18 34 147 -13 55 56 59 55 23 11 56 34 31 54 46 21 -168 0 0 55 27 58 10 24 13 35 148 -14 55 44 56 55 11 5 56 22 33 54 34 12 -167 0 0 55 15 40 10 24 7 35 149 -14 55 32 40 54 58 45 56 10 20 54 21 48 -166 0 0 55 3 7 10 24 1 36 150 -14 55 20 9 54 46 10 55 57 53 54 9 10 -165 0 0 54 50 20 10 23 55 36 151 -15 55 7 23 54 33 21 55 45 11 53 56 17 -164 0 0 54 37 18 10 23 49 37 152 -15 54 54 23 54 20 18 55 32 15 53 43 10 -163 0 0 54 24 2 10 23 43 37 153 -15 54 41 8 54 7 0 55 19 4 53 29 49 -162 0 0 54 10 31 10 23 37 37 154 -16 54 27 39 53 53 28 55 5 39 53 16 13 -161 0 0 53 56 47 10 23 31 38 155 -16 54 13 56 53 39 42 54 51 59 53 2 24 -160 0 0 53 42 48 10 23 24 38 157 -16 53 59 59 53 25 41 54 38 5 52 48 20 -159 0 0 53 28 34 10 23 18 39 158 -16 53 45 47 53 11 26 54 23 57 52 34 2 -158 0 0 53 14 7 10 23 11 39 159 -17 53 31 22 52 56 58 54 9 35 52 19 30 -157 0 0 52 59 26 10 23 4 40 160 -17 53 16 42 52 42 15 53 54 59 52 4 44 -156 0 0 52 44 31 10 22 58 40 161 -17 53 1 48 52 27 19 53 40 9 51 49 45 -155 0 0 52 29 23 10 22 51 40 162 -17 52 46 41 52 12 9 53 25 4 51 34 32 -154 0 0 52 14 0 10 22 44 41 164 -18 52 31 20 51 56 45 53 9 47 51 19 5 -153 0 0 51 58 24 10 22 37 41 165 -18 52 15 46 51 41 8 52 54 15 51 3 26 -152 0 0 51 42 35 10 22 29 42 166 -18 51 59 58 51 25 18 52 38 30 50 47 33 -151 0 0 51 26 33 10 22 22 42 167 -18 51 43 57 51 9 14 52 22 32 50 31 26 -150 0 0 51 10 18 10 22 14 43 168 -18 51 27 43 50 52 58 52 6 20 50 15 7 -149 0 0 50 53 49 10 22 7 43 170 -19 51 11 16 50 36 28 51 49 56 49 58 36 -148 0 0 50 37 9 10 21 59 43 171 -19 50 54 36 50 19 47 51 33 18 49 41 52 -147 0 0 50 20 15 10 21 51 44 172 -19 50 37 44 50 2 52 51 16 28 49 24 55 -146 0 0 50 3 10 10 21 43 44 174 -19 50 20 39 49 45 46 50 59 26 49 7 47 -145 0 0 49 45 52 10 21 35 44 175 -19 50 3 22 49 28 27 50 42 11 48 50 26 -144 0 0 49 28 23 10 21 27 45 176 -20 49 45 54 49 10 57 50 24 44 48 32 54 -143 0 0 49 10 42 10 21 19 45 178 -20 49 28 13 48 53 15 50 7 6 48 15 11 -142 0 0 48 52 49 10 21 11 45 179 -20 49 10 22 48 35 22 49 49 16 47 57 16 -141 0 0 48 34 46 10 21 2 46 180 -20 48 52 19 48 17 18 49 31 15 47 39 11 -140 0 0 48 16 32 10 20 54 46 182 -20 48 34 5 47 59 3 49 13 2 47 20 55 -139 0 0 47 58 7 10 20 45 46 183 -20 48 15 41 47 40 38 48 54 39 47 2 28 -138 0 0 47 39 32 10 20 37 46 185 -20 47 57 6 47 22 3 48 36 6 46 43 52 -137 0 0 47 20 47 10 20 28 47 186 -20 47 38 22 47 3 17 48 17 22 46 25 6 -136 0 0 47 1 53 10 20 19 47 187 -20 47 19 28 46 44 22 47 58 29 46 6 10 -135 0 0 46 42 49 10 20 10 47 189 -21 47 0 24 46 25 18 47 39 26 45 47 6 -134 0 0 46 23 36 10 20 1 47 190 -21 46 41 12 46 6 6 47 20 14 45 27 53 -133 0 0 46 4 15 10 19 52 48 192 -21 46 21 51 45 46 44 47 0 53 45 8 31 -132 0 0 45 44 45 10 19 43 48 193 -21 46 2 21 45 27 15 46 41 24 44 49 2 -131 0 0 45 25 8 10 19 33 48 195 -21 45 42 44 45 7 38 46 21 46 44 29 24 -130 0 0 45 5 23 10 19 24 48 196 -21 45 22 59 44 47 53 46 2 1 44 9 40 -129 0 0 44 45 32 10 19 15 48 198 -21 45 3 7 44 28 1 45 42 9 43 49 48 -128 0 0 44 25 33 10 19 5 48 199 -21 44 43 9 44 8 3 45 22 10 43 29 51 -127 0 0 44 5 28 10 18 56 48 201 -21 44 23 4 43 47 58 45 2 4 43 9 47 -126 0 0 43 45 18 10 18 46 48 202 -21 44 2 53 43 27 48 44 41 52 42 49 37 -125 0 0 43 25 2 10 18 36 48 204 -21 43 42 36 43 7 32 44 21 35 42 29 22 -124 0 0 43 4 41 10 18 27 48 206 -20 43 22 14 42 47 12 44 1 12 42 9 3 -123 0 0 42 44 15 10 18 17 48 207 -20 43 1 48 42 26 47 43 40 45 41 48 39 -122 0 0 42 23 45 10 18 7 48 209 -20 42 41 18 42 6 18 43 20 13 41 28 11 -121 0 0 42 3 12 10 17 57 48 210 -20 42 20 44 41 45 45 42 59 38 41 7 39 -120 0 0 41 42 35 10 17 47 48 212 -20 42 0 6 41 25 9 42 38 59 40 47 5 -119 0 0 41 21 56 10 17 37 48 213 -20 41 39 26 41 4 30 42 18 17 40 26 28 -118 0 0 41 1 14 10 17 27 48 215 -20 41 18 44 40 43 49 41 57 32 40 5 49 -117 0 0 40 40 30 10 17 17 48 216 -20 40 57 59 40 23 7 41 36 46 39 45 8 -116 0 0 40 19 46 10 17 7 48 218 -19 40 37 14 40 2 23 41 15 58 39 24 26 -115 0 0 39 59 0 10 16 57 48 219 -19 40 16 27 39 41 38 40 55 9 39 3 44 -114 0 0 39 38 14 10 16 47 47 221 -19 39 55 40 39 20 53 40 34 20 38 43 1 -113 0 0 39 17 28 10 16 37 47 222 -19 39 34 53 39 0 8 40 13 30 38 22 19 -112 0 0 38 56 43 10 16 27 47 224 -19 39 14 7 38 39 24 39 52 41 38 1 37 -111 0 0 38 35 59 10 16 17 47 225 -18 38 53 21 38 18 41 39 31 53 37 40 56 -110 0 0 38 15 16 10 16 7 46 226 -18 38 32 37 37 58 0 39 11 6 37 20 18 -109 0 0 37 54 36 10 15 57 46 228 -18 38 11 56 37 37 21 38 50 22 36 59 41 -108 0 0 37 33 58 10 15 47 46 229 -17 37 51 17 37 16 44 38 29 40 36 39 8 -107 0 0 37 13 23 10 15 37 45 231 -17 37 30 41 36 56 11 38 9 1 36 18 37 -106 0 0 36 52 52 10 15 27 45 232 -17 37 10 8 36 35 41 37 48 25 35 58 10 -105 0 0 36 32 25 10 15 17 45 233 -16 36 49 40 36 15 16 37 27 53 35 37 48 -104 0 0 36 12 3 10 15 8 44 234 -16 36 29 16 35 54 55 37 7 26 35 17 30 -103 0 0 35 51 46 10 14 58 44 236 -16 36 8 57 35 34 39 36 47 4 34 57 17 -102 0 0 35 31 34 10 14 48 43 237 -15 35 48 44 35 14 29 36 26 48 34 37 10 -101 0 0 35 11 28 10 14 38 43 238 -15 35 28 37 34 54 25 36 6 37 34 17 10 -100 0 0 34 51 29 10 14 29 42 239 -15 35 8 36 34 34 27 35 46 33 33 57 15 - 99 0 0 34 31 37 10 14 19 42 240 -14 34 48 43 34 14 37 35 26 36 33 37 28 - 98 0 0 34 11 53 10 14 10 41 242 -14 34 28 57 33 54 54 35 6 46 33 17 49 - 97 0 0 33 52 17 10 14 0 41 243 -13 34 9 19 33 35 19 34 47 4 32 58 18 - 96 0 0 33 32 49 10 13 51 40 244 -13 33 49 49 33 15 53 34 27 31 32 38 55 - 95 0 0 33 13 30 10 13 42 39 245 -12 33 30 29 32 56 36 34 8 7 32 19 41 - 94 0 0 32 54 21 10 13 32 39 246 -12 33 11 18 32 37 28 33 48 52 32 0 37 - 93 0 0 32 35 21 10 13 23 38 247 -11 32 52 17 32 18 30 33 29 47 31 41 43 - 92 0 0 32 16 32 10 13 14 38 248 -11 32 33 26 31 59 43 33 10 53 31 22 59 - 91 0 0 31 57 54 10 13 6 37 249 -10 32 14 46 31 41 6 32 52 9 31 4 26 - 90 0 0 31 39 27 10 12 57 36 250 -10 31 56 17 31 22 41 32 33 37 30 46 4 - 89 0 0 31 21 12 10 12 48 36 251 -9 31 38 0 31 4 27 32 15 16 30 27 54 - 88 0 0 31 3 9 10 12 40 35 252 -9 31 19 56 30 46 26 31 57 7 30 9 56 - 87 0 0 30 45 18 10 12 31 34 252 -8 31 2 4 30 28 37 31 39 12 29 52 11 - 86 0 0 30 27 41 10 12 23 34 253 -7 30 44 24 30 11 2 31 21 29 29 34 39 - 85 0 0 30 10 17 10 12 15 33 254 -7 30 26 59 29 53 39 31 3 59 29 17 20 - 84 0 0 29 53 7 10 12 7 32 255 -6 30 9 47 29 36 31 30 46 44 29 0 15 - 83 0 0 29 36 11 10 11 59 31 256 -6 29 52 50 29 19 37 30 29 43 28 43 25 - 82 0 0 29 19 30 10 11 52 31 256 -5 29 36 7 29 2 58 30 12 57 28 26 49 - 81 0 0 29 3 4 10 11 44 30 257 -4 29 19 40 28 46 33 29 56 25 28 10 28 - 80 0 0 28 46 54 10 11 37 29 258 -4 29 3 28 28 30 25 29 40 10 27 54 23 - 79 0 0 28 30 59 10 11 30 28 259 -3 28 47 32 28 14 32 29 24 10 27 38 33 - 78 0 0 28 15 21 10 11 23 28 259 -2 28 31 52 27 58 55 29 8 27 27 23 0 - 77 0 0 28 0 0 10 11 16 27 260 -2 28 16 29 27 43 35 28 53 0 27 7 43 - 76 0 0 27 44 55 10 11 9 26 261 -1 28 1 22 27 28 32 28 37 50 26 52 43 - 75 0 0 27 30 8 10 11 3 25 261 0 27 46 34 27 13 46 28 22 58 26 38 1 Uncertainty in time = +/- 6 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: 2UCAC 33242426 * constellation : Ophiuchus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 53 19.2555 DE: +04 09 17.290 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .047, .047 ) * V mag [mag]: 13.0 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (234) Barbara approx. diameter [km]: 44 approx. diameter ["]: .046 distance from Earth [AU]: 1.30900 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 854 number of rejected observations: 101 time covered by the observations: 1916 Jun 07 - 2008 Mar 29 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.018, 101° remarks: * orbital elements for (234) Barbara : Mean anomaly = 297.04744858 deg Arg. of pericenter = 192.09299368 deg Long. of node = 144.63384946 deg Inclination = 15.35424178 deg Eccentricity = 0.24453084 Semimajor axis = 2.38599911 AU Perihelion dist = 1.80254875 AU Mag: H = 8.98, G = 0.15 Epoch of elements : MJD 54607.42900000 TDT (2008 May 21.429) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 21 234 Barbara 10h 18.4m UT 13.0 16 53 19.255 4 9 17.292UCAC 33242426 0.0 12.1 44 4.9 1.309 -2.140 10.76 -140.7058 4.153 24.55 20.31 10.3070 0.21087 0.62649 -4.76166 1.60269 -0.00129 -0.00218 2000 295.0607642008 514.00000192.092994144.633849 15.3542420.24453084 2.3859991 1.8025487 9.0 5.00.15 RATE 2.6742290 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.057 0.050 94 2.10 0.051 0 54594.5020080521_242426 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:48 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org