IOTA/IOTA-ES occultation update for (712) Boliviana / UCAC2 26949243 event on 2008 May 15, 00:27 UT Visible from Europe, SW Asia Summary ------- On 2008 May 15 UT, the 128 km diameter asteroid (712) Boliviana will occult a 11.2 mag star in the constellation Scutum for observers along a path across Europe, SW Asia. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.1 mag to 13.2 mag (the magnitude of the asteroid) for at most 15.4 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, TMO astrometry for the asteroid kindly provided by Bill Owen, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: . The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2008 May 15, 00:21 - 2008 May 15, 00:38 UT * midpoint of event [JD]: 2454601.5194125 * magnitude of target star: 11.2 * magnitude drop [mag]: 2.1 * estimated maximum duration [s]: 15.4 * Moon: 78 % sunlit, 98° distance * Sun: 137° distance * rough path description: Europe, SW Asia The occultation path -------------------- * approximate projected width [km]: 149 * 1 sigma uncertainty interval [path widths]: +/- 0.21 * 1 sigma uncertainty interval [seconds]: +/- 3.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .020 +/- .014) * 1 sigma uncertainty ellipse (major, minor, PA): ( .020", .014", 81° ) * approx speed of asteroid's shadow [km/s]: 8.2795 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 26949243 by 712 Boliviana on 2008 May 15 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 - 17 5 4 67 0 0 0 38 57 1 131 -4 - 14 27 49 - 19 47 33 - 13 23 8 - 20 57 34 - 14 13 13 66 0 0 0 38 57 3 134 -5 - 11 46 41 - 16 43 47 - 10 46 13 - 17 48 22 Latitude Latitude Latitude Latitude - 14 0 0 65 55 8 0 38 56 3 134 -5 66 50 2 65 0 55 67 13 19 64 38 20 - 13 0 0 65 32 34 0 38 56 3 135 -6 66 28 0 64 37 51 66 51 30 64 15 5 - 12 0 0 65 9 14 0 38 55 4 136 -6 66 5 10 64 14 0 66 28 54 63 51 1 - 11 0 0 64 45 4 0 38 55 5 137 -6 65 41 32 63 49 21 66 5 30 63 26 9 - 10 0 0 64 20 5 0 38 54 5 137 -7 65 17 5 63 23 51 65 41 16 63 0 27 - 9 0 0 63 54 14 0 38 53 6 138 -7 64 51 46 62 57 30 65 16 11 62 33 53 - 8 0 0 63 27 31 0 38 52 6 139 -8 64 25 34 62 30 16 64 50 13 62 6 27 - 7 0 0 62 59 53 0 38 51 7 140 -8 63 58 29 62 2 8 64 23 21 61 38 7 - 6 0 0 62 31 20 0 38 50 8 141 -9 63 30 28 61 33 5 63 55 34 61 8 52 - 5 0 0 62 1 51 0 38 48 8 142 -9 63 1 30 61 3 6 63 26 50 60 38 40 - 4 0 0 61 31 24 0 38 46 9 143 -10 62 31 34 60 32 9 62 57 8 60 7 31 - 3 0 0 60 59 58 0 38 45 10 144 -10 62 0 39 60 0 14 62 26 26 59 35 24 - 2 0 0 60 27 32 0 38 43 11 145 -10 61 28 43 59 27 18 61 54 43 59 2 17 - 1 0 0 59 54 4 0 38 40 11 145 -11 60 55 45 58 53 23 61 21 58 58 28 10 0 0 0 59 19 34 0 38 38 12 146 -11 60 21 44 58 18 25 60 48 10 57 53 1 1 0 0 58 44 1 0 38 35 13 147 -12 59 46 40 57 42 26 60 13 18 57 16 51 2 0 0 58 7 24 0 38 33 14 148 -12 59 10 30 57 5 23 59 37 20 56 39 38 3 0 0 57 29 43 0 38 29 14 149 -13 58 33 15 56 27 17 59 0 17 56 1 22 4 0 0 56 50 57 0 38 26 15 150 -13 57 54 54 55 48 6 58 22 6 55 22 2 5 0 0 56 11 5 0 38 23 16 151 -14 57 15 26 55 7 52 57 42 49 54 41 38 6 0 0 55 30 7 0 38 19 17 151 -14 56 34 51 54 26 33 57 2 24 54 0 11 7 0 0 54 48 4 0 38 14 18 152 -15 55 53 9 53 44 11 56 20 51 53 17 40 8 0 0 54 4 56 0 38 10 19 153 -15 55 10 19 53 0 44 55 38 10 52 34 6 9 0 0 53 20 42 0 38 5 20 154 -16 54 26 24 52 16 13 54 54 22 51 49 29 10 0 0 52 35 24 0 38 0 21 155 -16 53 41 21 51 30 40 54 9 27 51 3 50 11 0 0 51 49 2 0 37 55 22 156 -17 52 55 14 50 44 5 53 23 26 50 17 10 12 0 0 51 1 37 0 37 49 23 157 -17 52 8 1 49 56 29 52 36 18 49 29 29 13 0 0 50 13 11 0 37 43 24 157 -18 51 19 45 49 7 53 51 48 7 48 40 50 14 0 0 49 23 45 0 37 36 25 158 -18 50 30 27 48 18 20 50 58 53 47 51 13 15 0 0 48 33 20 0 37 29 26 159 -19 49 40 8 47 27 50 50 8 37 47 0 41 16 0 0 47 41 59 0 37 22 27 160 -19 48 48 51 46 36 25 49 17 21 46 9 15 17 0 0 46 49 44 0 37 14 28 161 -20 47 56 38 45 44 8 48 25 9 45 16 57 18 0 0 45 56 37 0 37 6 29 162 -20 47 3 30 44 51 1 47 32 1 44 23 51 19 0 0 45 2 40 0 36 57 30 163 -21 46 9 31 43 57 7 46 38 1 43 29 58 20 0 0 44 7 57 0 36 48 31 164 -21 45 14 43 43 2 28 45 43 11 42 35 20 21 0 0 43 12 29 0 36 39 32 165 -22 44 19 9 42 7 8 44 47 34 41 40 2 22 0 0 42 16 22 0 36 29 33 166 -22 43 22 53 41 11 8 43 51 14 40 44 6 23 0 0 41 19 36 0 36 19 34 166 -23 42 25 57 40 14 33 42 54 13 39 47 35 24 0 0 40 22 16 0 36 8 35 167 -23 41 28 25 39 17 25 41 56 36 38 50 32 25 0 0 39 24 26 0 35 57 36 168 -23 40 30 20 38 19 48 40 58 25 37 53 0 26 0 0 38 26 8 0 35 46 37 169 -24 39 31 46 37 21 45 39 59 44 36 55 3 27 0 0 37 27 26 0 35 34 38 170 -24 38 32 47 36 23 20 39 0 37 35 56 45 28 0 0 36 28 24 0 35 22 39 171 -24 37 33 26 35 24 36 38 1 7 34 58 8 29 0 0 35 29 6 0 35 9 41 173 -25 36 33 47 34 25 36 37 1 19 33 59 17 30 0 0 34 29 34 0 34 56 42 174 -25 35 33 53 33 26 25 36 1 16 33 0 14 31 0 0 33 29 53 0 34 43 43 175 -25 34 33 49 32 27 6 35 1 2 32 1 3 32 0 0 32 30 6 0 34 30 44 176 -25 33 33 38 31 27 42 34 0 41 31 1 48 33 0 0 31 30 16 0 34 16 45 177 -25 32 33 24 30 28 16 33 0 15 30 2 32 34 0 0 30 30 28 0 34 1 46 178 -25 31 33 9 29 28 52 31 59 50 29 3 18 35 0 0 29 30 44 0 33 47 47 180 -25 30 32 59 28 29 33 30 59 27 28 4 9 36 0 0 28 31 7 0 33 32 48 181 -26 29 32 55 27 30 22 29 59 12 27 5 9 37 0 0 27 31 42 0 33 17 49 183 -26 28 33 2 26 31 23 28 59 6 26 6 20 38 0 0 26 32 30 0 33 2 50 184 -26 27 33 22 25 32 38 27 59 14 25 7 46 39 0 0 25 33 35 0 32 46 51 186 -26 26 33 58 24 34 10 26 59 38 24 9 29 40 0 0 24 35 0 0 32 31 52 187 -25 25 34 54 23 36 2 26 0 21 23 11 32 41 0 0 23 36 47 0 32 15 52 189 -25 24 36 11 22 38 17 25 1 26 22 13 58 42 0 0 22 38 58 0 31 59 53 190 -25 23 37 54 21 40 56 24 2 56 21 16 49 43 0 0 21 41 37 0 31 43 54 192 -25 22 40 4 20 44 3 23 4 53 20 20 7 44 0 0 20 44 46 0 31 26 55 194 -25 21 42 43 19 47 40 22 7 20 19 23 55 45 0 0 19 48 27 0 31 10 55 196 -25 20 45 55 18 51 48 21 10 18 18 28 15 46 0 0 18 52 41 0 30 54 56 198 -24 19 49 40 17 56 31 20 13 51 17 33 9 47 0 0 17 57 31 0 30 37 57 200 -24 18 54 1 17 1 49 19 18 0 16 38 38 48 0 0 17 2 59 0 30 21 57 202 -24 17 59 0 16 7 44 18 22 46 15 44 44 49 0 0 16 9 6 0 30 4 58 204 -24 17 4 39 15 14 18 17 28 12 14 51 30 50 0 0 15 15 54 0 29 47 58 206 -23 16 10 58 14 21 33 16 34 20 13 58 56 51 0 0 14 23 24 0 29 31 58 208 -23 15 18 1 13 29 30 15 41 10 13 7 4 52 0 0 13 31 38 0 29 14 59 210 -22 14 25 47 12 38 11 14 48 44 12 15 55 53 0 0 12 40 37 0 28 57 59 213 -22 13 34 18 11 47 35 13 57 3 11 25 30 54 0 0 11 50 21 0 28 41 59 215 -22 12 43 35 10 57 46 13 6 9 10 35 51 55 0 0 11 0 52 0 28 24 59 217 -21 11 53 40 10 8 42 12 16 2 9 46 58 56 0 0 10 12 12 0 28 8 59 219 -21 11 4 33 9 20 27 11 26 44 8 58 53 57 0 0 9 24 19 0 27 52 59 221 -20 10 16 15 8 32 59 10 38 15 8 11 36 58 0 0 8 37 17 0 27 36 59 224 -20 9 28 47 7 46 21 9 50 36 7 25 7 59 0 0 7 51 4 0 27 19 59 226 -19 8 42 10 7 0 32 9 3 48 6 39 28 60 0 0 7 5 42 0 27 3 59 228 -18 7 56 23 6 15 33 8 17 51 5 54 39 61 0 0 6 21 11 0 26 48 59 230 -18 7 11 28 5 31 25 7 32 46 5 10 40 62 0 0 5 37 31 0 26 32 59 232 -17 6 27 26 4 48 8 6 48 33 4 27 33 63 0 0 4 54 44 0 26 16 58 234 -17 5 44 15 4 5 43 6 5 13 3 45 16 64 0 0 4 12 48 0 26 1 58 236 -16 5 1 57 3 24 9 5 22 45 3 3 51 65 0 0 3 31 45 0 25 46 57 237 -15 4 20 33 2 43 27 4 41 11 2 23 18 66 0 0 2 51 35 0 25 31 57 239 -15 3 40 1 2 3 38 4 0 30 1 43 37 67 0 0 2 12 18 0 25 16 56 241 -14 3 0 23 1 24 40 3 20 43 1 4 48 68 0 0 1 33 53 0 25 1 56 242 -13 2 21 38 0 46 36 2 41 49 0 26 52 69 0 0 0 56 22 0 24 46 55 244 -13 1 43 46 0 9 24 2 3 49 - 0 10 12 70 0 0 0 19 43 0 24 32 55 245 -12 1 6 48 - 0 26 56 1 26 43 - 0 46 24 71 0 0 - 0 16 3 0 24 18 54 246 -11 0 30 44 - 1 2 23 0 50 30 - 1 21 44 72 0 0 - 0 50 55 0 24 4 54 248 -11 - 0 4 27 - 1 36 58 0 15 11 - 1 56 11 73 0 0 - 1 24 55 0 23 50 53 249 -10 - 0 38 45 - 2 10 40 - 0 19 14 - 2 29 46 74 0 0 - 1 58 2 0 23 37 52 250 -9 - 1 12 10 - 2 43 30 - 0 52 46 - 3 2 29 75 0 0 - 2 30 17 0 23 23 52 251 -9 - 1 44 41 - 3 15 28 - 1 25 25 - 3 34 21 76 0 0 - 3 1 39 0 23 10 51 252 -8 - 2 16 20 - 3 46 34 - 1 57 11 - 4 5 20 77 0 0 - 3 32 8 0 22 57 50 253 -7 - 2 47 5 - 4 16 48 - 2 28 3 - 4 35 28 78 0 0 - 4 1 46 0 22 45 49 253 -6 - 3 16 59 - 4 46 11 - 2 58 3 - 5 4 44 79 0 0 - 4 30 32 0 22 32 48 254 -6 - 3 45 59 - 5 14 42 - 3 27 10 - 5 33 9 80 0 0 - 4 58 26 0 22 20 48 255 -5 - 4 14 8 - 5 42 22 - 3 55 25 - 6 0 42 81 0 0 - 5 25 28 0 22 8 47 256 -4 - 4 41 25 - 6 9 10 - 4 22 48 - 6 27 25 82 0 0 - 5 51 39 0 21 56 46 256 -3 - 5 7 49 - 6 35 8 - 4 49 18 - 6 53 18 83 0 0 - 6 17 0 0 21 44 45 257 -3 - 5 33 23 - 7 0 16 - 5 14 58 - 7 18 20 84 0 0 - 6 41 29 0 21 33 44 257 -2 - 5 58 5 - 7 24 33 - 5 39 45 - 7 42 32 85 0 0 - 7 5 8 0 21 22 44 258 -1 - 6 21 56 - 7 47 59 - 6 3 42 - 8 5 54 86 0 0 - 7 27 57 0 21 11 43 258 0 - 6 44 57 - 8 10 37 - 6 26 47 - 8 28 26 Uncertainty in time = +/- 4 secs [Prediction of 2008 May 14.0] Data for the target star ------------------------ * name: UCAC2 26949243 * constellation : Scutum * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 26 18.2055 DE: -13 45 26.525 * position source: Pos: TMO, pm: , pi: * standard error: RA,DE ["]: ( .010, .010 ) * V mag [mag]: 11.2 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 276.7013009362 DE(deg): -13.7543116433 * Equation of equinoxes (radians) : 0.000040362485369 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (712) Boliviana approx. diameter [km]: 128 approx. diameter ["]: .083 distance from Earth [AU]: 2.13600 * orbital information: orbit source: Preston date of fit: 2008 May 14 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 882 number of rejected observations: 118 time covered by the observations: 1911 Mar 25 - 2008 May 14 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.010, 78° remarks: * orbital elements for (712) Boliviana : Mean anomaly = 224.28276106 deg Arg. of pericenter = 181.17440136 deg Long. of node = 231.03620545 deg Inclination = 12.77066937 deg Eccentricity = 0.18679202 Semimajor axis = 2.57648367 AU Perihelion dist = 2.09521709 AU Mag: H = 8.40, G = 0.03 Epoch of elements : MJD 54601.01900000 TDT (2008 May 15.019) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 15 712 Boliviana 0h 28.0m UT 11.2 18 26 18.206-13 45 26.53UCAC2 26949243 0.0 13.2 128 15.4 2.136 -0.991 12.74 36.4743 -13.760 172.10 18.91 0.4659 0.33825 0.38227 -3.50310 3.09302 -0.00372 -0.00087 2000 224.0399122008 514.00000181.174401231.036205 12.7706690.18679202 2.5764837 2.0952171 8.3 5.00.03 RATE 2.3832130 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.020 0.014 81 1.21 0.018 0 54600.5020080515_949243 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 14, 23:43 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org