IOTA/IOTA-ES occultation update for (712) Boliviana / TYC 5678-00789-1 event on 2008 Jun 22, 01:29 UT Visible from Africa, Cape Verde Is, SE USA Summary ------- On 2008 Jun 22 UT, the 128 km diameter asteroid (712) Boliviana will occult a 10.2 mag star in the constellation Serpens for observers along a path across Africa, Cape Verde Is, SE USA. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.4 mag to 12.5 mag (the magnitude of the asteroid) for at most 9.3 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 Jun 22, 01:22 - 2008 Jun 22, 01:36 UT * magnitude of target star: 10.2 * magnitude drop [mag]: 2.4 * estimated maximum duration [s]: 9.3 * Moon: 90 % sunlit, 41° distance * Sun: 168° distance * rough path description: Africa, Cape Verde Is, SE USA The occultation path -------------------- * approximate projected width [km]: 143 * 1 sigma uncertainty interval [path widths]: +/- 0.23 * 1 sigma uncertainty interval [seconds]: +/- 2.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .027 +/- .021) * 1 sigma uncertainty ellipse (major, minor, PA): ( .027", .021", 85° ) * approx speed of asteroid's shadow [km/s]: 13.7172 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5678-00789-1 by 712 Boliviana on 2008 Jun 22 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 - 95 0 0 35 16 24 1 36 31 10 111 -1 35 56 54 34 36 9 36 15 36 34 17 43 - 94 0 0 35 2 11 1 36 30 10 111 -1 35 42 43 34 21 54 36 1 27 34 3 27 - 93 0 0 34 47 49 1 36 28 11 112 -2 35 28 22 34 7 30 35 47 7 33 49 2 - 92 0 0 34 33 16 1 36 27 12 113 -3 35 13 51 33 52 55 35 32 36 33 34 26 - 91 0 0 34 18 33 1 36 25 13 113 -4 34 59 10 33 38 10 35 17 56 33 19 41 - 90 0 0 34 3 40 1 36 23 14 114 -5 34 44 19 33 23 16 35 3 6 33 4 46 - 89 0 0 33 48 38 1 36 21 15 114 -6 34 29 18 33 8 13 34 48 6 32 49 42 - 88 0 0 33 33 27 1 36 19 16 115 -6 34 14 9 32 53 0 34 32 57 32 34 28 - 87 0 0 33 18 7 1 36 17 16 115 -7 33 58 50 32 37 38 34 17 39 32 19 6 - 86 0 0 33 2 38 1 36 15 17 116 -8 33 43 23 32 22 8 34 2 12 32 3 35 - 85 0 0 32 47 1 1 36 12 18 117 -9 33 27 47 32 6 29 33 46 37 31 47 56 - 84 0 0 32 31 15 1 36 10 19 117 -10 33 12 2 31 50 43 33 30 53 31 32 9 - 83 0 0 32 15 22 1 36 7 20 118 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48 10 6 52 47 0 0 11 9 57 1 23 11 18 254 -16 11 49 6 10 31 1 12 7 11 10 13 11 48 0 0 11 16 36 1 23 8 17 255 -15 11 55 47 10 37 39 12 13 52 10 19 48 49 0 0 11 23 33 1 23 6 16 255 -14 12 2 45 10 44 35 12 20 52 10 26 43 50 0 0 11 30 49 1 23 3 15 255 -13 12 10 2 10 51 48 12 28 10 10 33 56 51 0 0 11 38 22 1 23 1 14 255 -12 12 17 38 10 59 20 12 35 46 10 41 27 52 0 0 11 46 13 1 22 59 13 256 -11 12 25 30 11 7 9 12 43 39 10 49 16 53 0 0 11 54 22 1 22 57 12 256 -10 12 33 41 11 15 17 12 51 51 10 57 22 54 0 0 12 2 49 1 22 55 11 256 -9 12 42 10 11 23 41 13 0 20 11 5 46 55 0 0 12 11 33 1 22 54 10 256 -8 12 50 56 11 32 24 13 9 8 11 14 27 56 0 0 12 20 35 1 22 52 9 256 -7 13 0 0 11 41 23 13 18 12 11 23 26 57 0 0 12 29 54 1 22 51 8 257 -6 13 9 21 11 50 40 13 27 34 11 32 42 58 0 0 12 39 30 1 22 50 7 257 -6 13 18 59 12 0 15 13 37 13 11 42 16 59 0 0 12 49 23 1 22 48 6 257 -5 13 28 54 12 10 6 13 47 9 11 52 6 60 0 0 12 59 33 1 22 48 5 257 -4 13 39 6 12 20 14 13 57 23 12 2 13 61 0 0 13 10 0 1 22 47 4 258 -3 13 49 35 12 30 38 14 7 52 12 12 37 62 0 0 13 20 43 1 22 46 3 258 -2 14 0 21 12 41 20 14 18 39 12 23 17 63 0 0 13 31 43 1 22 46 2 258 -1 14 11 23 12 52 17 14 29 42 12 34 14 Uncertainty in time = +/- 3 secs [Prediction of 2008 Jun 19.0] Data for the target star ------------------------ * name: TYC 5678-00789-1 * constellation : Serpens * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 17 57 47.4025 DE: -11 02 20.841 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .018 ) * V mag [mag]: 10.2 * B mag [mag]: 11.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (712) Boliviana approx. diameter [km]: 128 approx. diameter ["]: .092 distance from Earth [AU]: 1.91200 * orbital information: orbit source: Preston date of fit: 2008 Jun 18 source of used astrometry: FASTT TMO MPC (via Astdys) number of used observations: 772 number of rejected observations: 118 time covered by the observations: 1911 Mar 25 - 2008 Jun 12 1 sigma uncertainty ellipse (major, minor, PA): 0.018, 0.010, 79° remarks: * orbital elements for (712) Boliviana : Mean anomaly = 233.34690930 deg Arg. of pericenter = 181.17397557 deg Long. of node = 231.02801185 deg Inclination = 12.76820238 deg Eccentricity = 0.18663914 Semimajor axis = 2.57675982 AU Perihelion dist = 2.09583558 AU Mag: H = 8.40, G = 0.03 Epoch of elements : MJD 54639.06200000 TDT (2008 Jun 22.062) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Jun 22 712 Boliviana 1h 29.7m UT 10.2 17 57 47.403-11 2 20.84TYC 5678-00789-1 11.8 12.5 128 9.3 1.912 -2.365 7.47 -23.5874 -11.041 158.08 23.44 1.4950 0.09283 0.43309 -7.57011 1.62418 0.00012 -0.00119 2000 231.1875882008 613.00000181.173976231.028012 12.7682020.18663914 2.5767598 2.0958356 8.3 5.00.03 RATE 2.3828310 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.027 0.021 85 1.23 0.021 0 54636.5020080622_0789-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Jun 19, 00:13 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org