IOTA/IOTA-ES occultation update for (319) Leona / UCAC2 28634568 event on 2009 Sep 03, 15:31 UT Visible from Summary ------- On 2009 Sep 03 UT, the 81 km diameter asteroid (319) Leona will occult a 11.5 mag star in the constellation Aquila for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 3.8 mag to 15.2 mag (the magnitude of the asteroid) for at most 9.4 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: 69 * date and approx. time of event: 2009 Sep 03, 15:21 - 2009 Sep 03, 15:38 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 3.8 * estimated maximum duration [s]: 9.4 * Moon: 99 % sunlit, 31° distance * Sun: 137° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 95 * 1 sigma uncertainty interval [path widths]: +/- 0.84 * 1 sigma uncertainty interval [seconds]: +/- 8.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .035", 84° ) * approx speed of asteroid's shadow [km/s]: 8.6331 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 28634568 by 319 Leona on 2009 Sep 3 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 138 7 54 73 0 0 15 21 27 2 231 -10 135 48 51 140 32 16 132 5 12 144 49 33 134 7 30 72 0 0 15 21 28 3 227 -11 132 3 0 136 15 40 128 40 53 140 0 45 Latitude Latitude Latitude Latitude 133 0 0 71 41 24 15 21 28 4 226 -11 72 15 59 71 7 5 73 14 45 70 10 2 132 0 0 71 24 10 15 21 29 4 225 -11 71 59 8 70 49 28 72 58 34 69 51 49 131 0 0 71 6 15 15 21 29 5 224 -12 71 41 37 70 31 11 72 41 44 69 32 54 130 0 0 70 47 38 15 21 30 5 223 -12 71 23 24 70 12 10 72 24 12 69 13 15 129 0 0 70 28 16 15 21 31 5 222 -12 71 4 26 69 52 24 72 5 58 68 52 51 128 0 0 70 8 8 15 21 31 6 221 -13 70 44 44 69 31 53 71 46 59 68 31 40 127 0 0 69 47 13 15 21 32 6 220 -13 70 24 14 69 10 33 71 27 13 68 9 40 126 0 0 69 25 29 15 21 33 7 219 -13 70 2 55 68 48 23 71 6 40 67 46 50 125 0 0 69 2 53 15 21 34 7 218 -14 69 40 46 68 25 22 70 45 16 67 23 8 124 0 0 68 39 24 15 21 35 8 218 -14 69 17 43 68 1 27 70 23 0 66 58 32 123 0 0 68 15 0 15 21 36 8 217 -14 68 53 45 67 36 37 69 59 49 66 33 0 122 0 0 67 49 38 15 21 37 9 216 -15 68 28 51 67 10 50 69 35 42 66 6 31 121 0 0 67 23 18 15 21 39 10 215 -15 68 2 58 66 44 3 69 10 36 65 39 2 120 0 0 66 55 56 15 21 40 10 214 -16 67 36 3 66 16 15 68 44 30 65 10 32 119 0 0 66 27 31 15 21 42 11 213 -16 67 8 6 65 47 24 68 17 20 64 40 58 118 0 0 65 58 1 15 21 44 11 212 -16 66 39 3 65 17 28 67 49 6 64 10 20 117 0 0 65 27 24 15 21 46 12 211 -17 66 8 53 64 46 25 67 19 43 63 38 35 116 0 0 64 55 38 15 21 48 13 210 -17 65 37 33 64 14 12 66 49 11 63 5 42 115 0 0 64 22 40 15 21 50 13 209 -18 65 5 2 63 40 49 66 17 27 62 31 38 114 0 0 63 48 29 15 21 53 14 208 -18 64 31 17 63 6 13 65 44 29 61 56 22 113 0 0 63 13 3 15 21 56 15 207 -18 63 56 17 62 30 23 65 10 14 61 19 52 112 0 0 62 36 21 15 21 59 16 206 -19 63 19 59 61 53 17 64 34 41 60 42 8 111 0 0 61 58 20 15 22 2 16 206 -19 62 42 23 61 14 53 63 57 48 60 3 7 110 0 0 61 19 0 15 22 6 17 205 -20 62 3 26 60 35 10 63 19 33 59 22 49 109 0 0 60 38 19 15 22 9 18 204 -20 61 23 7 59 54 8 62 39 54 58 41 13 108 0 0 59 56 16 15 22 13 19 203 -21 60 41 25 59 11 44 61 58 50 57 58 18 107 0 0 59 12 50 15 22 18 20 202 -21 59 58 19 58 28 0 61 16 20 57 14 3 106 0 0 58 28 1 15 22 22 21 201 -22 59 13 49 57 42 53 60 32 23 56 28 28 105 0 0 57 41 48 15 22 27 22 200 -22 58 27 53 56 56 23 59 46 58 55 41 33 104 0 0 56 54 11 15 22 33 22 199 -23 57 40 32 56 8 32 59 0 5 54 53 19 103 0 0 56 5 11 15 22 39 23 198 -23 56 51 45 55 19 19 58 11 43 54 3 45 102 0 0 55 14 48 15 22 45 24 197 -24 56 1 34 54 28 45 57 21 54 53 12 53 101 0 0 54 23 3 15 22 51 25 196 -24 55 10 0 53 36 50 56 30 38 52 20 44 100 0 0 53 29 58 15 22 58 26 195 -24 54 17 3 52 43 38 55 37 55 51 27 19 99 0 0 52 35 34 15 23 5 27 194 -25 53 22 45 51 49 8 54 43 49 50 32 41 98 0 0 51 39 54 15 23 13 28 194 -25 52 27 8 50 53 24 53 48 20 49 36 51 97 0 0 50 42 59 15 23 21 29 193 -26 51 30 16 49 56 27 52 51 31 48 39 51 96 0 0 49 44 53 15 23 30 31 192 -26 50 32 9 48 58 21 51 53 24 47 41 46 95 0 0 48 45 38 15 23 39 32 191 -27 49 32 52 47 59 9 50 54 3 46 42 37 94 0 0 47 45 18 15 23 49 33 190 -27 48 32 29 46 58 53 49 53 32 45 42 28 93 0 0 46 43 58 15 23 59 34 189 -27 47 31 2 45 57 38 48 51 54 44 41 23 92 0 0 45 41 40 15 24 9 35 188 -28 46 28 36 44 55 28 47 49 13 43 39 25 91 0 0 44 38 29 15 24 20 36 186 -28 45 25 15 43 52 27 46 45 35 42 36 40 90 0 0 43 34 30 15 24 31 37 185 -28 44 21 4 42 48 39 45 41 2 41 33 10 89 0 0 42 29 47 15 24 43 38 184 -29 43 16 7 41 44 9 44 35 41 40 29 0 88 0 0 41 24 25 15 24 56 40 183 -29 42 10 30 40 39 2 43 29 37 39 24 15 87 0 0 40 18 28 15 25 8 41 182 -29 41 4 17 39 33 21 42 22 54 38 19 0 86 0 0 39 12 3 15 25 21 42 181 -29 39 57 33 38 27 12 41 15 39 37 13 18 85 0 0 38 5 13 15 25 35 43 179 -29 38 50 24 37 20 41 40 7 55 36 7 16 84 0 0 36 58 3 15 25 49 44 178 -29 37 42 54 36 13 51 38 59 49 35 0 56 83 0 0 35 50 39 15 26 3 45 177 -29 36 35 9 35 6 47 37 51 26 33 54 25 82 0 0 34 43 6 15 26 18 46 175 -29 35 27 14 33 59 35 36 42 51 32 47 46 81 0 0 33 35 28 15 26 33 47 174 -29 34 19 12 32 52 18 35 34 9 31 41 5 80 0 0 32 27 49 15 26 48 48 172 -29 33 11 10 31 45 2 34 25 25 30 34 24 79 0 0 31 20 15 15 27 3 49 171 -29 32 3 12 30 37 51 33 16 44 29 27 50 78 0 0 30 12 49 15 27 19 50 169 -29 30 55 22 29 30 49 32 8 10 28 21 25 77 0 0 29 5 36 15 27 35 51 167 -29 29 47 45 28 24 0 30 59 48 27 15 14 76 0 0 27 58 40 15 27 52 52 166 -29 28 40 24 27 17 28 29 51 43 26 9 20 75 0 0 26 52 5 15 28 8 53 164 -29 27 33 23 26 11 17 28 43 58 25 3 48 74 0 0 25 45 55 15 28 25 54 162 -28 26 26 47 25 5 31 27 36 37 23 58 40 73 0 0 24 40 12 15 28 42 54 160 -28 25 20 39 24 0 12 26 29 44 22 54 1 72 0 0 23 35 0 15 28 59 55 158 -28 24 15 2 22 55 25 25 23 23 21 49 52 71 0 0 22 30 22 15 29 16 56 156 -27 23 9 59 21 51 11 24 17 35 20 46 18 70 0 0 21 26 22 15 29 33 56 154 -27 22 5 34 20 47 35 23 12 26 19 43 20 69 0 0 20 23 1 15 29 50 57 151 -26 21 1 48 19 44 38 22 7 56 18 41 1 68 0 0 19 20 22 15 30 7 57 149 -26 19 58 45 18 42 23 21 4 10 17 39 24 67 0 0 18 18 27 15 30 24 58 147 -25 18 56 26 17 40 52 20 1 9 16 38 31 66 0 0 17 17 20 15 30 41 58 144 -25 17 54 54 16 40 7 18 58 55 15 38 23 65 0 0 16 17 0 15 30 59 58 142 -24 16 54 12 15 40 11 17 57 31 14 39 4 64 0 0 15 17 31 15 31 16 59 140 -24 15 54 19 14 41 4 16 56 58 13 40 34 63 0 0 14 18 54 15 31 33 59 137 -23 14 55 19 13 42 49 15 57 18 12 42 54 62 0 0 13 21 10 15 31 50 59 135 -22 13 57 13 12 45 27 14 58 32 11 46 8 61 0 0 12 24 21 15 32 6 59 132 -22 13 0 2 11 48 59 14 0 43 10 50 15 60 0 0 11 28 28 15 32 23 59 130 -21 12 3 47 10 53 27 13 3 50 9 55 16 59 0 0 10 33 32 15 32 40 59 128 -20 11 8 29 9 58 51 12 7 55 9 1 14 58 0 0 9 39 33 15 32 56 58 126 -20 10 14 10 9 5 13 11 13 0 8 8 8 57 0 0 8 46 33 15 33 13 58 123 -19 9 20 50 8 12 33 10 19 4 7 16 0 56 0 0 7 54 32 15 33 29 58 121 -18 8 28 29 7 20 51 9 26 8 6 24 50 55 0 0 7 3 31 15 33 45 57 119 -17 7 37 8 6 30 9 8 34 14 5 34 39 54 0 0 6 13 30 15 34 0 57 117 -17 6 46 49 5 40 27 7 43 21 4 45 27 53 0 0 5 24 30 15 34 16 57 116 -16 5 57 30 4 51 45 6 53 30 3 57 14 52 0 0 4 36 31 15 34 31 56 114 -15 5 9 13 4 4 3 6 4 42 3 10 2 51 0 0 3 49 33 15 34 46 55 112 -14 4 21 57 3 17 23 5 16 56 2 23 50 50 0 0 3 3 37 15 35 1 55 111 -13 3 35 44 2 31 43 4 30 12 1 38 37 49 0 0 2 18 42 15 35 16 54 109 -13 2 50 32 1 47 5 3 44 31 0 54 26 48 0 0 1 34 48 15 35 31 54 108 -12 2 6 22 1 3 27 2 59 53 0 11 14 47 0 0 0 51 56 15 35 45 53 106 -11 1 23 14 0 20 51 2 16 17 - 0 30 57 46 0 0 0 10 5 15 35 59 52 105 -10 0 41 8 - 0 20 45 1 33 44 - 1 12 7 45 0 0 - 0 30 44 15 36 13 51 104 -9 0 0 3 - 1 1 20 0 52 14 - 1 52 18 44 0 0 - 1 10 33 15 36 26 51 103 -8 - 0 40 0 - 1 40 54 0 11 45 - 2 31 29 43 0 0 - 1 49 20 15 36 39 50 102 -8 - 1 19 2 - 2 19 27 - 0 27 41 - 3 9 39 42 0 0 - 2 27 7 15 36 52 49 101 -7 - 1 57 3 - 2 57 1 - 1 6 6 - 3 46 50 41 0 0 - 3 3 54 15 37 5 48 100 -6 - 2 34 3 - 3 33 34 - 1 43 30 - 4 23 2 40 0 0 - 3 39 41 15 37 17 47 100 -5 - 3 10 3 - 4 9 8 - 2 19 52 - 4 58 15 39 0 0 - 4 14 28 15 37 30 47 99 -4 - 3 45 3 - 4 43 43 - 2 55 13 - 5 32 29 38 0 0 - 4 48 15 15 37 42 46 98 -3 - 4 19 2 - 5 17 18 - 3 29 34 - 6 5 45 37 0 0 - 5 21 4 15 37 53 45 98 -2 - 4 52 3 - 5 49 55 - 4 2 55 - 6 38 3 36 0 0 - 5 52 54 15 38 5 44 97 -1 - 5 24 5 - 6 21 34 - 4 35 17 - 7 9 23 35 0 0 - 6 23 46 15 38 16 43 97 -1 - 5 55 8 - 6 52 15 - 5 6 39 - 7 39 46 Uncertainty in time = +/- 8 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 28634568 * constellation : Aquila * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 58 15.0008 DE: -09 10 33.387 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .022, .028 ) * V mag [mag]: 11.5 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (319) Leona approx. diameter [km]: 81 approx. diameter ["]: .043 distance from Earth [AU]: 2.59000 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 852 number of rejected observations: 49 time covered by the observations: 1916 Sep 22 - 2008 Feb 09 1 sigma uncertainty ellipse (major, minor, PA): 0.032, 0.021, 82° remarks: * orbital elements for (319) Leona : Mean anomaly = 283.04949002 deg Arg. of pericenter = 228.14415790 deg Long. of node = 185.07403776 deg Inclination = 10.54464597 deg Eccentricity = 0.22177046 Semimajor axis = 3.40652374 AU Perihelion dist = 2.65105740 AU Mag: H = 10.12, G = 0.15 Epoch of elements : MJD 55077.64700000 TDT (2009 Sep 03.647) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Sep 3 319 Leona 15h 31.9m UT 11.5 19 58 15.001- 9 10 33.39UCAC2 28634568 0.0 15.2 81 9.4 2.590 -0.784 -11.77 83.6750 -9.172 -53.17 7.34 15.5324 -0.36879 0.36335 -3.42410 -3.46689 0.00389 -0.00006 2000 281.8507422009 827.00000228.144158185.074038 10.5446460.22177046 3.4065237 2.6510574 9.8 5.00.15 RATE 1.5676060 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.035 84 1.84 0.036 0 54545.5020090903_634568 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 12:49 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org