IOTA/IOTA-ES occultation update for (712) Boliviana / 2UCAC 25156726 event on 2008 Mar 25, 21:25 UT Visible from Indonesia, Philippines Summary ------- On 2008 Mar 25 UT, the 128 km diameter asteroid (712) Boliviana will occult a 11.3 mag star in the constellation Sagittarius for observers along a path across Indonesia, Philippines. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.9 mag to 14.1 mag (the magnitude of the asteroid) for at most 8.1 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: 38 * date and approx. time of event: 2008 Mar 25, 21:19 - 2008 Mar 25, 21:26 UT * midpoint of event [JD]: 2454551.39257917 * magnitude of target star: 11.3 * magnitude drop [mag]: 2.9 * estimated maximum duration [s]: 8.1 * Moon: 84 % sunlit, 43° distance * Sun: 92° distance * rough path description: Indonesia, Philippines The occultation path -------------------- * approximate projected width [km]: 144 * 1 sigma uncertainty interval [path widths]: +/- 1.76 * 1 sigma uncertainty interval [seconds]: +/- 13.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .111 +/- .111) * 1 sigma uncertainty ellipse (major, minor, PA): ( .111", .111", 90° ) * approx speed of asteroid's shadow [km/s]: 15.7110 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of 2UCAC 25156726 by 712 Boliviana on 2008 Mar 25 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 43 0 0 4 17 36 21 19 17 1 108 -83 3 36 58 4 58 29 .. .. .. .. .. .. 44 0 0 3 58 47 21 19 17 2 108 -83 3 18 15 4 39 34 .. .. .. 7 5 19 45 0 0 3 40 29 21 19 17 3 108 -83 3 0 2 4 21 11 .. .. .. 6 46 35 46 0 0 3 22 42 21 19 18 4 108 -83 2 42 21 4 3 18 .. .. .. 6 28 22 47 0 0 3 5 27 21 19 19 5 108 -82 2 25 12 3 45 58 .. .. .. 6 10 41 48 0 0 2 48 44 21 19 19 6 108 -82 2 8 33 3 29 9 .. .. .. 5 53 33 49 0 0 2 32 33 21 19 20 7 108 -81 1 52 27 3 12 53 - 0 26 51 5 36 57 50 0 0 2 16 54 21 19 21 8 108 -80 1 36 53 2 57 9 - 0 42 8 5 20 55 51 0 0 2 1 47 21 19 23 9 108 -80 1 21 52 2 41 57 - 0 56 54 5 5 25 52 0 0 1 47 13 21 19 24 10 109 -79 1 7 22 2 27 19 - 1 11 7 4 50 29 53 0 0 1 33 12 21 19 26 11 109 -78 0 53 25 2 13 13 - 1 24 49 4 36 7 54 0 0 1 19 44 21 19 27 12 109 -77 0 40 2 1 59 40 - 1 37 58 4 22 18 55 0 0 1 6 48 21 19 29 13 109 -76 0 27 11 1 46 41 - 1 50 35 4 9 3 56 0 0 0 54 26 21 19 31 14 109 -75 0 14 53 1 34 15 - 2 2 39 3 56 22 57 0 0 0 42 38 21 19 33 15 109 -74 0 3 8 1 22 22 - 2 14 11 3 44 15 58 0 0 0 31 23 21 19 35 16 109 -73 - 0 8 4 1 11 3 - 2 25 10 3 32 43 59 0 0 0 20 41 21 19 38 17 109 -72 - 0 18 42 1 0 18 - 2 35 36 3 21 45 60 0 0 0 10 33 21 19 40 18 109 -71 - 0 28 46 0 50 7 - 2 45 29 3 11 22 61 0 0 0 0 59 21 19 43 19 109 -70 - 0 38 17 0 40 30 - 2 54 50 3 1 33 62 0 0 - 0 8 1 21 19 46 20 109 -69 - 0 47 15 0 31 27 - 3 3 37 2 52 19 63 0 0 - 0 16 27 21 19 48 21 109 -68 - 0 55 38 0 22 58 - 3 11 51 2 43 40 64 0 0 - 0 24 19 21 19 51 22 109 -67 - 1 3 27 0 15 3 - 3 19 32 2 35 36 65 0 0 - 0 31 37 21 19 55 23 109 -66 - 1 10 43 0 7 43 - 3 26 39 2 28 7 66 0 0 - 0 38 20 21 19 58 24 109 -65 - 1 17 24 0 0 57 - 3 33 13 2 21 13 67 0 0 - 0 44 29 21 20 1 25 109 -64 - 1 23 31 - 0 5 14 - 3 39 14 2 14 55 68 0 0 - 0 50 4 21 20 5 26 110 -63 - 1 29 4 - 0 10 50 - 3 44 41 2 9 12 69 0 0 - 0 55 4 21 20 8 27 110 -62 - 1 34 3 - 0 15 52 - 3 49 34 2 4 4 70 0 0 - 0 59 30 21 20 12 28 110 -61 - 1 38 27 - 0 20 19 - 3 53 54 1 59 32 71 0 0 - 1 3 21 21 20 16 29 110 -60 - 1 42 17 - 0 24 12 - 3 57 40 1 55 36 72 0 0 - 1 6 38 21 20 20 30 110 -59 - 1 45 33 - 0 27 29 - 4 0 52 1 52 15 73 0 0 - 1 9 19 21 20 24 31 110 -58 - 1 48 14 - 0 30 11 - 4 3 30 1 49 30 74 0 0 - 1 11 26 21 20 29 32 110 -57 - 1 50 20 - 0 32 19 - 4 5 35 1 47 21 75 0 0 - 1 12 58 21 20 33 33 111 -56 - 1 51 52 - 0 33 51 - 4 7 5 1 45 47 76 0 0 - 1 13 55 21 20 37 34 111 -55 - 1 52 49 - 0 34 48 - 4 8 2 1 44 50 77 0 0 - 1 14 17 21 20 42 35 111 -54 - 1 53 11 - 0 35 10 - 4 8 24 1 44 28 78 0 0 - 1 14 4 21 20 47 36 111 -53 - 1 52 58 - 0 34 57 - 4 8 12 1 44 43 79 0 0 - 1 13 16 21 20 52 37 112 -52 - 1 52 11 - 0 34 8 - 4 7 27 1 45 33 80 0 0 - 1 11 53 21 20 56 38 112 -51 - 1 50 48 - 0 32 44 - 4 6 7 1 47 0 81 0 0 - 1 9 55 21 21 1 39 112 -50 - 1 48 51 - 0 30 45 - 4 4 13 1 49 2 82 0 0 - 1 7 22 21 21 7 40 112 -49 - 1 46 19 - 0 28 11 - 4 1 44 1 51 41 83 0 0 - 1 4 13 21 21 12 41 113 -48 - 1 43 11 - 0 25 1 - 3 58 42 1 54 57 84 0 0 - 1 0 29 21 21 17 42 113 -47 - 1 39 29 - 0 21 15 - 3 55 5 1 58 48 85 0 0 - 0 56 10 21 21 23 42 114 -46 - 1 35 12 - 0 16 54 - 3 50 53 2 3 16 86 0 0 - 0 51 15 21 21 28 43 114 -45 - 1 30 19 - 0 11 57 - 3 46 7 2 8 20 87 0 0 - 0 45 45 21 21 34 44 115 -44 - 1 24 51 - 0 6 25 - 3 40 47 2 14 1 88 0 0 - 0 39 40 21 21 40 45 115 -43 - 1 18 48 - 0 0 17 - 3 34 52 2 20 18 89 0 0 - 0 32 59 21 21 46 46 116 -42 - 1 12 10 0 6 26 - 3 28 23 2 27 11 90 0 0 - 0 25 43 21 21 52 47 116 -41 - 1 4 57 0 13 45 - 3 21 19 2 34 41 91 0 0 - 0 17 51 21 21 58 48 117 -40 - 0 57 8 0 21 40 - 3 13 41 2 42 47 92 0 0 - 0 9 24 21 22 4 49 117 -39 - 0 48 44 0 30 10 - 3 5 28 2 51 29 93 0 0 - 0 0 22 21 22 10 49 118 -38 - 0 39 45 0 39 16 - 2 56 41 3 0 48 94 0 0 0 9 17 21 22 16 50 119 -37 - 0 30 11 0 48 58 - 2 47 19 3 10 44 95 0 0 0 19 30 21 22 23 51 120 -36 - 0 20 1 0 59 16 - 2 37 23 3 21 16 96 0 0 0 30 19 21 22 29 52 121 -35 - 0 9 17 1 10 9 - 2 26 51 3 32 24 97 0 0 0 41 43 21 22 36 53 121 -34 0 2 4 1 21 37 - 2 15 46 3 44 9 98 0 0 0 53 43 21 22 42 53 122 -33 0 13 59 1 33 42 - 2 4 6 3 56 30 99 0 0 1 6 18 21 22 49 54 123 -32 0 26 29 1 46 21 - 1 51 51 4 9 27 100 0 0 1 19 28 21 22 56 55 125 -31 0 39 35 1 59 37 - 1 39 2 4 23 0 101 0 0 1 33 14 21 23 3 56 126 -30 0 53 15 2 13 27 - 1 25 39 4 37 10 102 0 0 1 47 35 21 23 10 56 127 -29 1 7 31 2 27 53 - 1 11 41 4 51 55 103 0 0 2 2 30 21 23 17 57 128 -27 1 22 21 2 42 55 - 0 57 9 5 7 17 104 0 0 2 18 1 21 23 24 58 130 -26 1 37 46 2 58 31 - 0 42 2 5 23 14 105 0 0 2 34 7 21 23 31 58 131 -25 1 53 46 3 14 43 - 0 26 22 5 39 47 106 0 0 2 50 47 21 23 38 59 132 -24 2 10 21 3 31 29 - 0 10 7 5 56 55 107 0 0 3 8 2 21 23 46 59 134 -23 2 27 30 3 48 50 0 6 41 6 14 39 108 0 0 3 25 52 21 23 53 60 136 -22 2 45 13 4 6 46 0 24 4 6 32 59 109 0 0 3 44 16 21 24 0 60 137 -21 3 3 31 4 25 17 0 42 0 6 51 53 110 0 0 4 3 14 21 24 8 61 139 -20 3 22 22 4 44 21 1 0 29 7 11 22 111 0 0 4 22 46 21 24 15 61 141 -19 3 41 48 5 4 0 1 19 32 7 31 26 112 0 0 4 42 51 21 24 23 62 143 -18 4 1 46 5 24 13 1 39 8 7 52 4 113 0 0 5 3 30 21 24 30 62 145 -17 4 22 18 5 44 59 1 59 16 8 13 16 114 0 0 5 24 43 21 24 38 62 147 -16 4 43 24 6 6 18 2 19 58 8 35 1 115 0 0 5 46 28 21 24 46 62 149 -15 5 5 2 6 28 11 2 41 11 8 57 21 116 0 0 6 8 46 21 24 54 63 151 -14 5 27 12 6 50 36 3 2 57 9 20 13 117 0 0 6 31 36 21 25 1 63 154 -13 5 49 55 7 13 33 3 25 15 9 43 38 118 0 0 6 54 57 21 25 9 63 156 -12 6 13 9 7 37 2 3 48 4 10 7 35 119 0 0 7 18 51 21 25 17 63 158 -11 6 36 55 8 1 3 4 11 25 10 32 5 120 0 0 7 43 15 21 25 25 63 160 -10 7 1 12 8 25 36 4 35 16 10 57 5 121 0 0 8 8 10 21 25 32 63 163 -9 7 25 59 8 50 38 4 59 37 11 22 37 122 0 0 8 33 35 21 25 40 63 165 -8 7 51 17 9 16 11 5 24 29 11 48 39 123 0 0 8 59 30 21 25 48 63 167 -7 8 17 4 9 42 14 5 49 49 12 15 10 124 0 0 9 25 54 21 25 56 62 170 -6 8 43 20 10 8 46 6 15 39 12 42 11 125 0 0 9 52 46 21 26 4 62 172 -4 9 10 4 10 35 46 6 41 58 13 9 41 126 0 0 10 20 7 21 26 11 62 174 -3 9 37 17 11 3 15 7 8 44 13 37 39 127 0 0 10 47 55 21 26 19 61 176 -2 10 4 57 11 31 10 7 35 57 14 6 4 128 0 0 11 16 9 21 26 27 61 178 -1 10 33 3 11 59 33 8 3 38 14 34 55 129 0 0 11 44 49 21 26 35 60 180 0 11 1 36 12 28 21 8 31 44 15 4 13 Uncertainty in time = +/- 14 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: 2UCAC 25156726 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 16 38.0873 DE: -17 51 44.987 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .110, .110 ) * V mag [mag]: 11.3 * B mag [mag]: 0.0 * Apparent position with proper motion RA(deg): 274.2816656482 DE(deg): -17.8618441143 * Equation of equinoxes (radians) : 0.000040629161216 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (712) Boliviana approx. diameter [km]: 128 approx. diameter ["]: .063 distance from Earth [AU]: 2.80800 * orbital information: orbit source: Preston date of fit: 2008 Feb 13 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 748 number of rejected observations: 118 time covered by the observations: 1911 Mar 25 - 2007 Aug 07 1 sigma uncertainty ellipse (major, minor, PA): 0.013, 0.008, 78° remarks: * orbital elements for (712) Boliviana : Mean anomaly = 212.33439427 deg Arg. of pericenter = 181.17817093 deg Long. of node = 231.04339841 deg Inclination = 12.77359120 deg Eccentricity = 0.18699624 Semimajor axis = 2.57607713 AU Perihelion dist = 2.09436039 AU Mag: H = 8.41, G = 0.03 Epoch of elements : MJD 54550.89300000 TDT (2008 Mar 25.893) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 25 712 Boliviana 21h 25.3m UT 11.3 18 16 38.087-17 51 44.992UCAC 25156726 0.0 14.1 128 8.1 2.808 1.799 10.57 129.1250 -17.865 -139.89 2.23 21.4219 -0.17192 0.42168 8.20172 3.37176 -0.00581 -0.00018 2000 212.1215232008 325.00000181.178171231.043398 12.7735910.18699624 2.5760771 2.0943604 8.3 5.00.03 RATE 2.3837770 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.111 0.111 90 2.76 0.110 0 54510.5020080325_156726 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 19:42 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org