IOTA/IOTA-ES occultation update for (712) Boliviana / 2UCAC 26736893 event on 2008 May 07, 22:54 UT Visible from Antarctica, Africa Summary ------- On 2008 May 07 UT, the 128 km diameter asteroid (712) Boliviana will occult a 11.7 mag star in the constellation Scutum for observers along a path across Antarctica, Africa. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.9 mag to 13.4 mag (the magnitude of the asteroid) for at most 18.7 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: UCAC. The event at a glimpse ---------------------- * Rank: 99 * date and approx. time of event: 2008 May 07, 22:39 - 2008 May 07, 23:10 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 1.9 * estimated maximum duration [s]: 18.7 * Moon: 9 % sunlit, 160° distance * Sun: 130° distance * rough path description: Antarctica, Africa The occultation path -------------------- * approximate projected width [km]: 130 * 1 sigma uncertainty interval [path widths]: +/- 0.32 * 1 sigma uncertainty interval [seconds]: +/- 5.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .026 +/- .023) * 1 sigma uncertainty ellipse (major, minor, PA): ( .026", .023", 85° ) * approx speed of asteroid's shadow [km/s]: 6.8207 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 26736893 by 712 Boliviana on 2008 May 7 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 - 11 33 35 45 0 0 23 10 5 0 111 -25 - 9 18 44 ... .. .. - 7 57 48 ... .. .. - 8 6 11 44 0 0 23 10 4 3 113 -26 - 6 7 56 - 10 12 48 - 4 55 53 - 11 39 17 Latitude Latitude Latitude Latitude - 8 0 0 43 58 4 23 10 4 3 113 -26 44 36 16 43 19 47 45 0 41 42 55 14 - 7 0 0 43 38 46 23 10 3 4 114 -27 44 17 13 43 0 15 44 41 47 42 35 32 - 6 0 0 43 18 37 23 10 2 4 114 -28 43 57 19 42 39 51 44 22 3 42 14 59 - 5 0 0 42 57 36 23 10 1 5 115 -28 43 36 33 42 18 33 44 1 27 41 53 31 - 4 0 0 42 35 40 23 10 0 6 116 -29 43 14 54 41 56 21 43 39 58 41 31 9 - 3 0 0 42 12 49 23 9 58 7 116 -29 42 52 20 41 33 13 43 17 35 41 7 50 - 2 0 0 41 49 2 23 9 57 8 117 -30 42 28 51 41 9 9 42 54 16 40 43 34 - 1 0 0 41 24 18 23 9 55 9 118 -30 42 4 24 40 44 6 42 30 1 40 18 19 0 0 0 40 58 34 23 9 52 9 118 -31 41 38 59 40 18 3 42 4 49 39 52 5 1 0 0 40 31 50 23 9 50 10 119 -32 41 12 34 39 51 0 41 38 36 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0 -69 36 54 22 40 37 21 286 -6 -69 1 7 -70 12 45 -68 38 16 -70 35 43 140 0 0 -69 40 54 22 40 35 21 285 -6 -69 5 14 -70 16 39 -68 42 27 -70 39 34 141 0 0 -69 44 35 22 40 33 20 284 -6 -69 9 1 -70 20 14 -68 46 17 -70 43 5 142 0 0 -69 47 56 22 40 31 20 283 -5 -69 12 27 -70 23 29 -68 49 46 -70 46 17 143 0 0 -69 50 57 22 40 29 20 282 -5 -69 15 33 -70 26 26 -68 52 55 -70 49 10 144 0 0 -69 53 39 22 40 27 19 281 -5 -69 18 19 -70 29 4 -68 55 44 -70 51 45 145 0 0 -69 56 2 22 40 25 19 280 -5 -69 20 46 -70 31 23 -68 58 14 -70 54 2 146 0 0 -69 58 6 22 40 24 19 279 -4 -69 22 53 -70 33 24 -69 0 23 -70 56 1 147 0 0 -69 59 52 22 40 22 18 278 -4 -69 24 42 -70 35 6 -69 2 13 -70 57 41 148 0 0 -70 1 18 22 40 20 18 277 -4 -69 26 11 -70 36 30 -69 3 44 -70 59 4 149 0 0 -70 2 26 22 40 18 18 276 -4 -69 27 20 -70 37 36 -69 4 55 -71 0 9 150 0 0 -70 3 16 22 40 17 17 275 -4 -69 28 11 -70 38 24 -69 5 46 -71 0 56 151 0 0 -70 3 47 22 40 15 17 274 -3 -69 28 43 -70 38 54 -69 6 19 -71 1 25 152 0 0 -70 3 59 22 40 13 17 273 -3 -69 28 56 -70 39 6 -69 6 32 -71 1 37 153 0 0 -70 3 53 22 40 12 16 273 -3 -69 28 50 -70 39 0 -69 6 26 -71 1 31 154 0 0 -70 3 29 22 40 10 16 272 -3 -69 28 25 -70 38 36 -69 6 1 -71 1 8 155 0 0 -70 2 46 22 40 9 16 271 -2 -69 27 41 -70 37 54 -69 5 16 -71 0 26 156 0 0 -70 1 44 22 40 7 15 270 -2 -69 26 38 -70 36 54 -69 4 12 -70 59 27 157 0 0 -70 0 24 22 40 6 15 269 -2 -69 25 16 -70 35 36 -69 2 49 -70 58 10 158 0 0 -69 58 45 22 40 4 14 268 -2 -69 23 35 -70 33 59 -69 1 6 -70 56 35 159 0 0 -69 56 47 22 40 3 14 267 -1 -69 21 34 -70 32 5 -68 59 4 -70 54 42 160 0 0 -69 54 30 22 40 1 14 266 -1 -69 19 14 -70 29 51 -68 56 41 -70 52 31 161 0 0 -69 51 54 22 40 0 13 265 -1 -69 16 34 -70 27 19 -68 53 59 -70 50 1 162 0 0 -69 48 59 22 39 59 13 264 -1 -69 13 34 -70 24 28 -68 50 57 -70 47 13 163 0 0 -69 45 44 22 39 57 13 263 0 -69 10 15 -70 21 18 -68 47 34 -70 44 6 164 0 0 -69 42 10 22 39 56 12 262 0 -69 6 35 -70 17 49 -68 43 50 -70 40 41 Uncertainty in time = +/- 6 secs [Prediction of 2008 Apr 23.0] Data for the target star ------------------------ * name: 2UCAC 26736893 * constellation : Scutum * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 28 30.1491 DE: -14 21 44.356 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .021 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (712) Boliviana approx. diameter [km]: 128 approx. diameter ["]: .080 distance from Earth [AU]: 2.21300 * orbital information: orbit source: Preston date of fit: 2008 Apr 22 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 754 number of rejected observations: 118 time covered by the observations: 1911 Mar 25 - 2008 Apr 18 1 sigma uncertainty ellipse (major, minor, PA): 0.017, 0.009, 78° remarks: * orbital elements for (712) Boliviana : Mean anomaly = 222.59925889 deg Arg. of pericenter = 181.17478544 deg Long. of node = 231.03746256 deg Inclination = 12.77111123 deg Eccentricity = 0.18682105 Semimajor axis = 2.57642796 AU Perihelion dist = 2.09509698 AU Mag: H = 8.41, G = 0.03 Epoch of elements : MJD 54593.95500000 TDT (2008 May 07.955) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 7 712 Boliviana 22h 54.8m UT 11.7 18 28 30.149-14 21 44.362UCAC 26736893 0.0 13.4 128 18.7 2.213 -0.563 12.94 67.2711 -14.366 -164.57 17.12 22.9136 -0.16165 -0.10188 -2.05386 3.25617 -0.00429 -0.00080 2000 221.6566672008 5 4.00000181.174785231.037463 12.7711110.18682105 2.5764280 2.0950970 8.3 5.00.03 RATE 2.3832910 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.026 0.023 85 1.32 0.026 0 54579.5020080507_736893 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 23, 04:07 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org