IOTA/IOTA-ES occultation update for (160) Una / TYC 6871-00165-1 event on 2008 May 19, 06:06 UT Visible from Brazil, Bolivia, Peru Summary ------- On 2008 May 19 UT, the 81 km diameter asteroid (160) Una will occult a 9.9 mag star in the constellation Sagittarius for observers along a path across Brazil, Bolivia, Peru. In the case of an occultation, the combined light of the asteroid and the star will drop by 3.9 mag to 13.7 mag (the magnitude of the asteroid) for at most 16.0 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: 88 * date and approx. time of event: 2008 May 19, 05:50 - 2008 May 19, 06:25 UT * magnitude of target star: 9.9 * magnitude drop [mag]: 3.9 * estimated maximum duration [s]: 16.0 * Moon: 99 % sunlit, 52° distance * Sun: 137° distance * rough path description: Brazil, Bolivia, Peru The occultation path -------------------- * approximate projected width [km]: 87 * 1 sigma uncertainty interval [path widths]: +/- 0.55 * 1 sigma uncertainty interval [seconds]: +/- 7.7 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .029 +/- .030) * 1 sigma uncertainty ellipse (major, minor, PA): ( .030", .029", 359° ) * approx speed of asteroid's shadow [km/s]: 5.0755 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6871-00165-1 by 160 Una on 2008 May 19 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 -143 0 0 - 3 30 21 6 25 57 0 118 -43 .. .. .. - 3 57 24 .. .. .. - 4 27 2 -142 0 0 - 4 2 22 6 25 57 1 118 -44 - 3 35 22 - 4 29 16 - 3 5 32 - 4 58 45 -141 0 0 - 4 33 38 6 25 56 2 118 -45 - 4 6 46 - 5 0 23 - 3 37 6 - 5 29 43 -140 0 0 - 5 4 9 6 25 55 3 118 -46 - 4 37 25 - 5 30 46 - 4 7 55 - 5 59 56 -139 0 0 - 5 33 54 6 25 53 4 118 -47 - 5 7 19 - 6 0 23 - 4 37 58 - 6 29 25 -138 0 0 - 6 2 55 6 25 51 6 118 -48 - 5 36 28 - 6 29 16 - 5 7 16 - 6 58 9 -137 0 0 - 6 31 11 6 25 48 7 118 -49 - 6 4 53 - 6 57 25 - 5 35 49 - 7 26 9 -136 0 0 - 6 58 43 6 25 45 8 118 -50 - 6 32 32 - 7 24 49 - 6 3 38 - 7 53 25 -135 0 0 - 7 25 31 6 25 41 9 118 -51 - 6 59 28 - 7 51 29 - 6 30 41 - 8 19 57 -134 0 0 - 7 51 35 6 25 37 10 117 -52 - 7 25 39 - 8 17 26 - 6 57 1 - 8 45 46 -133 0 0 - 8 16 55 6 25 33 11 117 -54 - 7 51 6 - 8 42 39 - 7 22 36 - 9 10 51 -132 0 0 - 8 41 32 6 25 28 12 117 -55 - 8 15 50 - 9 7 9 - 7 47 28 - 9 35 14 -131 0 0 - 9 5 26 6 25 22 13 117 -56 - 8 39 51 - 9 30 56 - 8 11 36 - 9 58 53 -130 0 0 - 9 28 37 6 25 17 14 117 -57 - 9 3 8 - 9 54 1 - 8 35 1 -10 21 51 -129 0 0 - 9 51 6 6 25 11 15 117 -58 - 9 25 43 -10 16 23 - 8 57 43 -10 44 6 -128 0 0 -10 12 52 6 25 4 16 117 -59 - 9 47 36 -10 38 3 - 9 19 43 -11 5 40 -127 0 0 -10 33 57 6 24 57 17 116 -60 -10 8 47 -10 59 2 - 9 41 0 -11 26 32 -126 0 0 -10 54 20 6 24 50 18 116 -61 -10 29 15 -11 19 19 -10 1 35 -11 46 43 -125 0 0 -11 14 1 6 24 43 19 116 -62 -10 49 3 -11 38 55 -10 21 29 -12 6 13 -124 0 0 -11 33 2 6 24 35 20 116 -63 -11 8 9 -11 57 50 -10 40 42 -12 25 2 -123 0 0 -11 51 22 6 24 26 21 116 -64 -11 26 35 -12 16 5 -10 59 13 -12 43 12 -122 0 0 -12 9 2 6 24 18 22 116 -65 -11 44 20 -12 33 40 -11 17 4 -13 0 41 -121 0 0 -12 26 3 6 24 9 23 116 -66 -12 1 25 -12 50 36 -11 34 14 -13 17 31 -120 0 0 -12 42 23 6 24 0 24 115 -67 -12 17 50 -13 6 51 -11 50 45 -13 33 42 -119 0 0 -12 58 4 6 23 51 25 115 -68 -12 33 36 -13 22 28 -12 6 35 -13 49 13 -118 0 0 -13 13 6 6 23 41 26 115 -69 -12 48 42 -13 37 26 -12 21 47 -14 4 6 -117 0 0 -13 27 29 6 23 31 27 115 -70 -13 3 10 -13 51 45 -12 36 19 -14 18 21 -116 0 0 -13 41 14 6 23 20 28 115 -70 -13 16 58 -14 5 26 -12 50 12 -14 31 58 -115 0 0 -13 54 21 6 23 10 29 115 -71 -13 30 9 -14 18 29 -13 3 27 -14 44 56 -114 0 0 -14 6 50 6 22 59 30 115 -72 -13 42 41 -14 30 54 -13 16 3 -14 57 18 -113 0 0 -14 18 41 6 22 48 31 115 -73 -13 54 36 -14 42 41 -13 28 2 -15 9 2 -112 0 0 -14 29 55 6 22 37 31 115 -74 -14 5 53 -14 53 52 -13 39 23 -15 20 8 -111 0 0 -14 40 31 6 22 25 32 114 -75 -14 16 33 -15 4 26 -13 50 6 -15 30 39 -110 0 0 -14 50 31 6 22 13 33 114 -76 -14 26 36 -15 14 22 -14 0 12 -15 40 32 -109 0 0 -14 59 54 6 22 1 34 114 -77 -14 36 2 -15 23 43 -14 9 41 -15 49 50 -108 0 0 -15 8 41 6 21 49 35 114 -78 -14 44 51 -15 32 27 -14 18 34 -15 58 31 -107 0 0 -15 16 52 6 21 36 36 114 -79 -14 53 4 -15 40 35 -14 26 49 -16 6 37 -106 0 0 -15 24 26 6 21 23 37 114 -80 -15 0 41 -15 48 7 -14 34 29 -16 14 6 -105 0 0 -15 31 25 6 21 10 38 114 -80 -15 7 42 -15 55 4 -14 41 32 -16 21 1 -104 0 0 -15 37 48 6 20 57 39 114 -81 -15 14 7 -16 1 25 -14 48 0 -16 27 20 -103 0 0 -15 43 36 6 20 43 39 114 -82 -15 19 57 -16 7 12 -14 53 51 -16 33 4 -102 0 0 -15 48 49 6 20 30 40 114 -83 -15 25 11 -16 12 23 -14 59 8 -16 38 13 -101 0 0 -15 53 27 6 20 16 41 114 -84 -15 29 50 -16 16 59 -15 3 48 -16 42 48 -100 0 0 -15 57 29 6 20 1 42 114 -84 -15 33 55 -16 21 0 -15 7 54 -16 46 48 - 99 0 0 -16 0 57 6 19 47 43 114 -85 -15 37 24 -16 24 27 -15 11 25 -16 50 14 - 98 0 0 -16 3 51 6 19 33 44 114 -85 -15 40 18 -16 27 19 -15 14 20 -16 53 5 - 97 0 0 -16 6 10 6 19 18 45 114 -86 -15 42 38 -16 29 37 -15 16 41 -16 55 22 - 96 0 0 -16 7 54 6 19 3 45 114 -86 -15 44 23 -16 31 21 -15 18 27 -16 57 5 - 95 0 0 -16 9 4 6 18 48 46 114 -86 -15 45 34 -16 32 31 -15 19 39 -16 58 14 - 94 0 0 -16 9 41 6 18 32 47 114 -86 -15 46 11 -16 33 7 -15 20 16 -16 58 50 - 93 0 0 -16 9 43 6 18 17 48 115 -85 -15 46 13 -16 33 9 -15 20 18 -16 58 51 - 92 0 0 -16 9 11 6 18 1 49 115 -85 -15 45 42 -16 32 37 -15 19 47 -16 58 19 - 91 0 0 -16 8 5 6 17 45 50 115 -84 -15 44 36 -16 31 31 -15 18 41 -16 57 14 - 90 0 0 -16 6 26 6 17 29 50 115 -84 -15 42 56 -16 29 52 -15 17 1 -16 55 34 - 89 0 0 -16 4 13 6 17 13 51 115 -83 -15 40 43 -16 27 39 -15 14 47 -16 53 22 - 88 0 0 -16 1 26 6 16 56 52 116 -82 -15 37 55 -16 24 53 -15 12 0 -16 50 36 - 87 0 0 -15 58 5 6 16 40 53 116 -81 -15 34 34 -16 21 33 -15 8 38 -16 47 17 - 86 0 0 -15 54 11 6 16 23 53 116 -80 -15 30 39 -16 17 39 -15 4 42 -16 43 24 - 85 0 0 -15 49 43 6 16 6 54 117 -80 -15 26 11 -16 13 12 -15 0 12 -16 38 58 - 84 0 0 -15 44 42 6 15 49 55 117 -79 -15 21 8 -16 8 12 -14 55 9 -16 33 59 - 83 0 0 -15 39 7 6 15 32 56 118 -78 -15 15 32 -16 2 38 -14 49 32 -16 28 27 - 82 0 0 -15 32 59 6 15 14 56 118 -77 -15 9 23 -15 56 31 -14 43 21 -16 22 21 - 81 0 0 -15 26 17 6 14 56 57 119 -76 -15 2 39 -15 49 51 -14 36 36 -16 15 42 - 80 0 0 -15 19 2 6 14 39 58 119 -75 -14 55 22 -15 42 37 -14 29 17 -16 8 30 - 79 0 0 -15 11 13 6 14 21 59 120 -74 -14 47 32 -15 34 50 -14 21 24 -16 0 45 - 78 0 0 -15 2 50 6 14 2 59 121 -74 -14 39 7 -15 26 29 -14 12 58 -15 52 26 - 77 0 0 -14 53 54 6 13 44 60 121 -73 -14 30 9 -15 17 35 -14 3 58 -15 43 34 - 76 0 0 -14 44 25 6 13 26 61 122 -72 -14 20 38 -15 8 8 -13 54 24 -15 34 9 - 75 0 0 -14 34 21 6 13 7 61 123 -71 -14 10 32 -14 58 7 -13 44 15 -15 24 10 - 74 0 0 -14 23 44 6 12 48 62 124 -70 -13 59 53 -14 47 32 -13 33 33 -15 13 39 - 73 0 0 -14 12 34 6 12 29 63 125 -69 -13 48 40 -14 36 24 -13 22 17 -15 2 33 - 72 0 0 -14 0 49 6 12 10 63 126 -68 -13 36 52 -14 24 42 -13 10 27 -14 50 54 - 71 0 0 -13 48 31 6 11 51 64 127 -67 -13 24 31 -14 12 27 -12 58 3 -14 38 42 - 70 0 0 -13 35 39 6 11 32 64 129 -66 -13 11 36 -13 59 38 -12 45 5 -14 25 56 - 69 0 0 -13 22 13 6 11 12 65 130 -65 -12 58 8 -13 46 15 -12 31 33 -14 12 36 - 68 0 0 -13 8 13 6 10 52 66 131 -65 -12 44 4 -13 32 18 -12 17 26 -13 58 43 - 67 0 0 -12 53 39 6 10 33 66 133 -64 -12 29 27 -13 17 48 -12 2 45 -13 44 16 - 66 0 0 -12 38 31 6 10 13 66 135 -63 -12 14 16 -13 2 43 -11 47 30 -13 29 15 - 65 0 0 -12 22 49 6 9 53 67 136 -62 -11 58 30 -12 47 5 -11 31 40 -13 13 41 - 64 0 0 -12 6 33 6 9 32 67 138 -61 -11 42 10 -12 30 52 -11 15 16 -12 57 32 - 63 0 0 -11 49 43 6 9 12 68 140 -60 -11 25 16 -12 14 5 -10 58 18 -12 40 50 - 62 0 0 -11 32 18 6 8 52 68 142 -59 -11 7 47 -11 56 44 -10 40 45 -12 23 33 - 61 0 0 -11 14 19 6 8 31 68 144 -58 -10 49 44 -11 38 49 -10 22 37 -12 5 42 - 60 0 0 -10 55 45 6 8 10 69 146 -57 -10 31 6 -11 20 20 -10 3 55 -11 47 18 - 59 0 0 -10 36 37 6 7 50 69 148 -56 -10 11 54 -11 1 16 - 9 44 38 -11 28 19 - 58 0 0 -10 16 55 6 7 29 69 151 -55 - 9 52 7 -10 41 38 - 9 24 46 -11 8 45 - 57 0 0 - 9 56 38 6 7 8 69 153 -54 - 9 31 46 -10 21 26 - 9 4 19 -10 48 38 - 56 0 0 - 9 35 46 6 6 47 69 155 -53 - 9 10 49 -10 0 39 - 8 43 18 -10 27 56 - 55 0 0 - 9 14 20 6 6 25 69 158 -52 - 8 49 18 - 9 39 17 - 8 21 41 -10 6 40 - 54 0 0 - 8 52 19 6 6 4 69 160 -51 - 8 27 13 - 9 17 22 - 7 59 30 - 9 44 49 - 53 0 0 - 8 29 44 6 5 43 69 163 -50 - 8 4 32 - 8 54 51 - 7 36 44 - 9 22 24 - 52 0 0 - 8 6 34 6 5 21 69 165 -49 - 7 41 17 - 8 31 46 - 7 13 23 - 8 59 24 - 51 0 0 - 7 42 49 6 5 0 69 167 -48 - 7 17 27 - 8 8 6 - 6 49 27 - 8 35 50 - 50 0 0 - 7 18 29 6 4 38 69 170 -47 - 6 53 2 - 7 43 52 - 6 24 56 - 8 11 42 - 49 0 0 - 6 53 35 6 4 17 68 172 -46 - 6 28 2 - 7 19 4 - 5 59 51 - 7 46 59 - 48 0 0 - 6 28 7 6 3 55 68 174 -45 - 6 2 28 - 6 53 40 - 5 34 10 - 7 21 42 - 47 0 0 - 6 2 3 6 3 33 68 177 -44 - 5 36 19 - 6 27 43 - 5 7 55 - 6 55 50 - 46 0 0 - 5 35 26 6 3 11 67 179 -43 - 5 9 36 - 6 1 11 - 4 41 5 - 6 29 25 - 45 0 0 - 5 8 13 6 2 49 67 181 -42 - 4 42 17 - 5 34 4 - 4 13 40 - 6 2 25 - 44 0 0 - 4 40 27 6 2 28 66 183 -41 - 4 14 25 - 5 6 23 - 3 45 41 - 5 34 50 - 43 0 0 - 4 12 6 6 2 6 66 185 -40 - 3 45 58 - 4 38 9 - 3 17 7 - 5 6 42 - 42 0 0 - 3 43 11 6 1 44 65 187 -39 - 3 16 57 - 4 9 20 - 2 47 59 - 4 38 0 - 41 0 0 - 3 13 42 6 1 22 65 188 -38 - 2 47 22 - 3 39 57 - 2 18 17 - 4 8 44 - 40 0 0 - 2 43 39 6 1 0 64 190 -37 - 2 17 12 - 3 10 0 - 1 48 1 - 3 38 54 - 39 0 0 - 2 13 3 6 0 38 63 191 -36 - 1 46 30 - 2 39 30 - 1 17 11 - 3 8 31 - 38 0 0 - 1 41 53 6 0 16 63 193 -35 - 1 15 13 - 2 8 27 - 0 45 47 - 2 37 34 - 37 0 0 - 1 10 10 5 59 54 62 194 -34 - 0 43 24 - 1 36 50 - 0 13 50 - 2 6 5 - 36 0 0 - 0 37 54 5 59 33 61 196 -33 - 0 11 1 - 1 4 41 0 18 40 - 1 34 2 - 35 0 0 - 0 5 5 5 59 11 60 197 -32 0 21 54 - 0 31 59 0 51 43 - 1 1 28 - 34 0 0 0 28 16 5 58 49 60 198 -31 0 55 22 0 1 15 1 25 18 - 0 28 21 - 33 0 0 1 2 9 5 58 28 59 199 -30 1 29 22 0 35 2 1 59 26 0 5 18 - 32 0 0 1 36 34 5 58 6 58 201 -29 2 3 54 1 9 20 2 34 5 0 39 29 - 31 0 0 2 11 30 5 57 45 57 202 -28 2 38 57 1 44 9 3 9 15 1 14 11 - 30 0 0 2 46 56 5 57 24 56 203 -27 3 14 30 2 19 28 3 44 57 1 49 23 - 29 0 0 3 22 53 5 57 3 55 203 -26 3 50 34 2 55 19 4 21 9 2 25 5 - 28 0 0 3 59 20 5 56 42 54 204 -25 4 27 8 3 31 38 4 57 50 3 1 18 - 27 0 0 4 36 16 5 56 21 53 205 -24 5 4 11 4 8 27 5 35 1 3 37 59 - 26 0 0 5 13 41 5 56 0 53 206 -22 5 41 43 4 45 45 6 12 41 4 15 9 - 25 0 0 5 51 33 5 55 40 52 207 -21 6 19 43 5 23 31 6 50 49 4 52 48 - 24 0 0 6 29 54 5 55 20 51 208 -20 6 58 10 6 1 44 7 29 24 5 30 53 - 23 0 0 7 8 40 5 55 0 50 208 -19 7 37 4 6 40 24 8 8 25 6 9 26 - 22 0 0 7 47 53 5 54 40 49 209 -18 8 16 23 7 19 30 8 47 53 6 48 24 - 21 0 0 8 27 31 5 54 20 48 210 -17 8 56 8 7 59 0 9 27 46 7 27 47 - 20 0 0 9 7 33 5 54 1 47 210 -16 9 36 17 8 38 56 10 8 2 8 7 35 - 19 0 0 9 47 58 5 53 42 45 211 -15 10 16 49 9 19 14 10 48 42 8 47 46 - 18 0 0 10 28 46 5 53 23 44 211 -14 10 57 44 9 59 55 11 29 44 9 28 20 - 17 0 0 11 9 55 5 53 5 43 212 -13 11 39 0 10 40 57 12 11 8 10 9 15 - 16 0 0 11 51 24 5 52 47 42 213 -11 12 20 36 11 22 20 12 52 51 10 50 31 - 15 0 0 12 33 13 5 52 29 41 213 -10 13 2 31 12 4 3 13 34 54 11 32 6 - 14 0 0 13 15 20 5 52 11 40 214 -9 13 44 44 12 46 3 14 17 15 12 14 0 - 13 0 0 13 57 44 5 51 54 39 214 -8 14 27 15 13 28 21 14 59 52 12 56 11 - 12 0 0 14 40 24 5 51 37 38 215 -7 15 10 1 14 10 55 15 42 45 13 38 38 - 11 0 0 15 23 18 5 51 21 37 215 -6 15 53 1 14 53 43 16 25 52 14 21 20 - 10 0 0 16 6 25 5 51 5 36 216 -5 16 36 14 15 36 45 17 9 11 15 4 15 - 9 0 0 16 49 44 5 50 50 35 216 -4 17 19 39 16 19 58 17 52 42 15 47 22 - 8 0 0 17 33 14 5 50 35 34 217 -3 18 3 14 17 3 22 18 36 23 16 30 41 - 7 0 0 18 16 52 5 50 20 32 217 -2 18 46 57 17 46 56 19 20 13 17 14 9 - 6 0 0 19 0 38 5 50 6 31 218 0 19 30 48 18 30 37 20 4 10 17 57 44 Uncertainty in time = +/- 9 secs [Prediction of 2008 May 8.0] Data for the target star ------------------------ * name: TYC 6871-00165-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 18 50 00.5650 DE: -28 12 46.674 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .027 ) * V mag [mag]: 9.9 * B mag [mag]: 10.8 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (160) Una approx. diameter [km]: 81 approx. diameter ["]: .054 distance from Earth [AU]: 2.05900 * orbital information: orbit source: Preston date of fit: 2008 May 07 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 868 number of rejected observations: 134 time covered by the observations: 1910 Oct 12 - 2008 Apr 30 1 sigma uncertainty ellipse (major, minor, PA): 0.021, 0.014, 84° remarks: * orbital elements for (160) Una : Mean anomaly = 212.41497483 deg Arg. of pericenter = 49.90427699 deg Long. of node = 8.78784037 deg Inclination = 3.82149861 deg Eccentricity = 0.06584771 Semimajor axis = 2.72961771 AU Perihelion dist = 2.54987863 AU Mag: H = 9.02, G = 0.15 Epoch of elements : MJD 54605.25400000 TDT (2008 May 19.254) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 19 160 Una 6h 6.4m UT 9.9 18 50 0.565-28 12 46.67TYC 6871-00165-1 10.8 13.7 81 16.0 2.059 -0.843 -5.11 -46.3757 -28.211 87.53 19.86 6.1060 -0.14733 0.32182 -2.60300 -1.19634 -0.00380 0.00005 2000 211.2667122008 514.00000 49.904277 8.787840 3.8214990.06584771 2.7296177 2.5498786 9.1 5.00.15 RATE 2.1855030 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.030 0.029 359 1.55 0.030 0 54594.5020080519_0165-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 May 08, 03:37 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org