IOTA/IOTA-ES occultation update for (207) Hedda / UCAC2 25324990 event on 2009 Apr 12, 00:55 UT Visible from Summary ------- On 2009 Apr 12 UT, the 66 km diameter asteroid (207) Hedda will occult a 11.7 mag star in the constellation Libra for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 1.5 mag to 12.8 mag (the magnitude of the asteroid) for at most 9.0 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: 85 * date and approx. time of event: 2009 Apr 12, 00:47 - 2009 Apr 12, 01:04 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 1.5 * estimated maximum duration [s]: 9.0 * Moon: 93 % sunlit, 7° distance * Sun: 156° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 106 * 1 sigma uncertainty interval [path widths]: +/- 0.60 * 1 sigma uncertainty interval [seconds]: +/- 6.1 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .051 +/- .044) * 1 sigma uncertainty ellipse (major, minor, PA): ( .051", .043", 97° ) * approx speed of asteroid's shadow [km/s]: 7.2510 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of UCAC2 25324990 by 207 Hedda on 2009 Apr 12 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 - 58 0 0 53 2 11 1 4 56 1 120 -19 53 35 58 52 28 52 .. .. .. .. .. .. - 57 0 0 52 41 30 1 4 55 1 121 -20 53 15 15 52 8 13 53 56 25 .. .. .. - 56 0 0 52 20 45 1 4 55 2 122 -20 52 54 28 51 47 30 53 35 35 .. .. .. - 55 0 0 51 59 56 1 4 54 3 123 -21 52 33 37 51 26 43 53 14 41 50 47 27 - 54 0 0 51 39 4 1 4 53 3 123 -22 52 12 42 51 5 53 52 53 43 50 26 40 - 53 0 0 51 18 9 1 4 52 4 124 -22 51 51 45 50 45 1 52 32 42 50 5 51 - 52 0 0 50 57 12 1 4 51 5 125 -23 51 30 45 50 24 8 52 11 39 49 45 1 - 51 0 0 50 36 15 1 4 49 6 126 -24 51 9 44 50 3 13 51 50 34 49 24 10 - 50 0 0 50 15 16 1 4 48 6 127 -24 50 48 42 49 42 17 51 29 28 49 3 18 - 49 0 0 49 54 17 1 4 45 7 127 -25 50 27 40 49 21 22 51 8 22 48 42 27 - 48 0 0 49 33 19 1 4 43 8 128 -26 50 6 39 49 0 28 50 47 15 48 21 36 - 47 0 0 49 12 23 1 4 41 8 129 -26 49 45 38 48 39 35 50 26 10 48 0 47 - 46 0 0 48 51 28 1 4 38 9 130 -27 49 24 39 48 18 43 50 5 6 47 40 0 - 45 0 0 48 30 35 1 4 35 10 130 -27 49 3 42 47 57 55 49 44 5 47 19 16 - 44 0 0 48 9 46 1 4 32 11 131 -28 48 42 49 47 37 10 49 23 6 46 58 36 - 43 0 0 47 49 0 1 4 28 11 132 -29 48 21 59 47 16 28 49 2 10 46 37 59 - 42 0 0 47 28 19 1 4 24 12 133 -29 48 1 13 46 55 51 48 41 19 46 17 27 - 41 0 0 47 7 42 1 4 21 13 133 -30 47 40 32 46 35 19 48 20 32 45 57 0 - 40 0 0 46 47 11 1 4 16 13 134 -31 47 19 56 46 14 52 47 59 50 45 36 38 - 39 0 0 46 26 46 1 4 12 14 135 -31 46 59 26 45 54 32 47 39 15 45 16 23 - 38 0 0 46 6 28 1 4 7 15 136 -32 46 39 3 45 34 18 47 18 45 44 56 15 - 37 0 0 45 46 17 1 4 2 16 137 -32 46 18 47 45 14 12 46 58 23 44 36 14 - 36 0 0 45 26 14 1 3 57 16 137 -33 45 58 39 44 54 14 46 38 9 44 16 22 - 35 0 0 45 6 19 1 3 52 17 138 -34 45 38 40 44 34 24 46 18 3 43 56 37 - 34 0 0 44 46 33 1 3 46 18 139 -34 45 18 49 44 14 43 45 58 6 43 37 2 - 33 0 0 44 26 57 1 3 40 18 140 -35 44 59 8 43 55 12 45 38 18 43 17 37 - 32 0 0 44 7 31 1 3 34 19 140 -35 44 39 36 43 35 51 45 18 40 42 58 21 - 31 0 0 43 48 15 1 3 28 20 141 -36 44 20 15 43 16 40 44 59 13 42 39 16 - 30 0 0 43 29 11 1 3 21 21 142 -36 44 1 6 42 57 40 44 39 57 42 20 23 - 29 0 0 43 10 18 1 3 14 21 143 -37 43 42 7 42 38 53 44 20 52 42 1 40 - 28 0 0 42 51 37 1 3 7 22 144 -37 43 23 21 42 20 17 44 1 59 41 43 10 - 27 0 0 42 33 9 1 3 0 23 145 -38 43 4 48 42 1 53 43 43 19 41 24 53 - 26 0 0 42 14 53 1 2 53 23 145 -38 42 46 27 41 43 43 43 24 52 41 6 48 - 25 0 0 41 56 51 1 2 45 24 146 -39 42 28 20 41 25 46 43 6 38 40 48 57 - 24 0 0 41 39 3 1 2 37 25 147 -39 42 10 27 41 8 3 42 48 39 40 31 20 - 23 0 0 41 21 29 1 2 29 25 148 -40 41 52 48 40 50 34 42 30 53 40 13 57 - 22 0 0 41 4 10 1 2 21 26 149 -40 41 35 23 40 33 20 42 13 23 39 56 48 - 21 0 0 40 47 6 1 2 12 26 150 -40 41 18 14 40 16 21 41 56 7 39 39 55 - 20 0 0 40 30 18 1 2 4 27 150 -41 41 1 21 39 59 37 41 39 8 39 23 17 - 19 0 0 40 13 46 1 1 55 28 151 -41 40 44 44 39 43 10 41 22 24 39 6 55 - 18 0 0 39 57 29 1 1 46 28 152 -41 40 28 22 39 26 58 41 5 57 38 50 49 - 17 0 0 39 41 30 1 1 36 29 153 -42 40 12 18 39 11 3 40 49 46 38 34 59 - 16 0 0 39 25 47 1 1 27 29 154 -42 39 56 31 38 55 25 40 33 53 38 19 27 - 15 0 0 39 10 22 1 1 17 30 155 -42 39 41 1 38 40 5 40 18 17 38 4 11 - 14 0 0 38 55 14 1 1 8 30 156 -43 39 25 48 38 25 1 40 2 59 37 49 13 - 13 0 0 38 40 24 1 0 58 31 157 -43 39 10 54 38 10 16 39 47 59 37 34 33 - 12 0 0 38 25 53 1 0 48 31 158 -43 38 56 18 37 55 49 39 33 17 37 20 11 - 11 0 0 38 11 40 1 0 37 32 159 -43 38 42 1 37 41 40 39 18 54 37 6 7 - 10 0 0 37 57 46 1 0 27 32 160 -43 38 28 2 37 27 50 39 4 50 36 52 22 - 9 0 0 37 44 11 1 0 17 33 161 -43 38 14 23 37 14 19 38 51 6 36 38 56 - 8 0 0 37 30 55 1 0 6 33 162 -43 38 1 3 37 1 8 38 37 41 36 25 49 - 7 0 0 37 17 59 0 59 55 34 163 -44 37 48 3 36 48 16 38 24 35 36 13 1 - 6 0 0 37 5 23 0 59 44 34 164 -44 37 35 22 36 35 43 38 11 50 36 0 33 - 5 0 0 36 53 6 0 59 33 35 165 -44 37 23 2 36 23 31 37 59 25 35 48 25 - 4 0 0 36 41 10 0 59 22 35 166 -44 37 11 3 36 11 38 37 47 21 35 36 37 - 3 0 0 36 29 35 0 59 11 35 167 -44 36 59 24 36 0 6 37 35 37 35 25 9 - 2 0 0 36 18 20 0 59 0 36 168 -44 36 48 5 35 48 55 37 24 14 35 14 2 - 1 0 0 36 7 26 0 58 48 36 169 -44 36 37 8 35 38 5 37 13 13 35 3 15 0 0 0 35 56 54 0 58 37 36 170 -43 36 26 32 35 27 35 37 2 32 34 52 49 1 0 0 35 46 42 0 58 25 37 171 -43 36 16 17 35 17 27 36 52 14 34 42 45 2 0 0 35 36 52 0 58 14 37 172 -43 36 6 24 35 7 40 36 42 17 34 33 1 3 0 0 35 27 24 0 58 2 37 174 -43 35 56 52 34 58 14 36 32 42 34 23 39 4 0 0 35 18 17 0 57 50 37 175 -43 35 47 43 34 49 10 36 23 28 34 14 38 5 0 0 35 9 32 0 57 38 38 176 -43 35 38 55 34 40 28 36 14 37 34 5 59 6 0 0 35 1 9 0 57 26 38 177 -42 35 30 30 34 32 8 36 6 9 33 57 42 7 0 0 34 53 9 0 57 14 38 178 -42 35 22 27 34 24 10 35 58 3 33 49 46 8 0 0 34 45 31 0 57 2 38 179 -42 35 14 46 34 16 34 35 50 19 33 42 13 9 0 0 34 38 15 0 56 50 38 180 -42 35 7 28 34 9 20 35 42 58 33 35 2 10 0 0 34 31 22 0 56 38 38 182 -41 35 0 33 34 2 29 35 36 0 33 28 13 11 0 0 34 24 51 0 56 26 38 183 -41 34 54 0 33 56 0 35 29 25 33 21 47 12 0 0 34 18 43 0 56 14 38 184 -41 34 47 51 33 49 54 35 23 13 33 15 43 13 0 0 34 12 58 0 56 2 38 185 -40 34 42 4 33 44 11 35 17 24 33 10 2 14 0 0 34 7 37 0 55 50 38 186 -40 34 36 41 33 38 51 35 11 59 33 4 44 15 0 0 34 2 38 0 55 37 38 187 -39 34 31 40 33 33 54 35 6 56 32 59 48 16 0 0 33 58 2 0 55 25 38 189 -39 34 27 3 33 29 19 35 2 18 32 55 15 17 0 0 33 53 50 0 55 13 38 190 -39 34 22 49 33 25 8 34 58 2 32 51 5 18 0 0 33 50 1 0 55 1 38 191 -38 34 18 59 33 21 20 34 54 11 32 47 19 19 0 0 33 46 35 0 54 49 38 192 -38 34 15 33 33 17 55 34 50 43 32 43 55 20 0 0 33 43 32 0 54 37 38 193 -37 34 12 29 33 14 54 34 47 39 32 40 54 21 0 0 33 40 54 0 54 25 38 194 -37 34 9 50 33 12 16 34 44 58 32 38 17 22 0 0 33 38 38 0 54 13 38 195 -36 34 7 34 33 10 1 34 42 42 32 36 3 23 0 0 33 36 47 0 54 1 38 197 -36 34 5 42 33 8 10 34 40 49 32 34 12 24 0 0 33 35 19 0 53 49 37 198 -35 34 4 14 33 6 42 34 39 20 32 32 45 25 0 0 33 34 15 0 53 37 37 199 -34 34 3 9 33 5 38 34 38 16 32 31 41 26 0 0 33 33 34 0 53 25 37 200 -34 34 2 29 33 4 58 34 37 35 32 31 1 27 0 0 33 33 17 0 53 14 37 201 -33 34 2 12 33 4 41 34 37 18 32 30 44 28 0 0 33 33 24 0 53 2 36 202 -33 34 2 19 33 4 48 34 37 26 32 30 50 29 0 0 33 33 55 0 52 50 36 203 -32 34 2 50 33 5 18 34 37 57 32 31 21 30 0 0 33 34 50 0 52 39 36 204 -31 34 3 45 33 6 12 34 38 53 32 32 14 31 0 0 33 36 8 0 52 28 35 205 -31 34 5 4 33 7 30 34 40 13 32 33 31 32 0 0 33 37 51 0 52 16 35 206 -30 34 6 48 33 9 12 34 41 57 32 35 12 33 0 0 33 39 57 0 52 5 35 207 -29 34 8 55 33 11 17 34 44 5 32 37 17 34 0 0 33 42 27 0 51 54 34 208 -29 34 11 26 33 13 46 34 46 37 32 39 45 35 0 0 33 45 21 0 51 43 34 209 -28 34 14 21 33 16 39 34 49 34 32 42 36 36 0 0 33 48 38 0 51 32 33 210 -27 34 17 40 33 19 55 34 52 54 32 45 51 37 0 0 33 52 20 0 51 21 33 211 -27 34 21 23 33 23 36 34 56 39 32 49 30 38 0 0 33 56 25 0 51 11 32 212 -26 34 25 29 33 27 39 35 0 48 32 53 32 39 0 0 34 0 54 0 51 0 32 213 -25 34 30 0 33 32 7 35 5 21 32 57 57 40 0 0 34 5 47 0 50 50 31 214 -25 34 34 55 33 36 58 35 10 17 33 2 46 41 0 0 34 11 4 0 50 40 31 215 -24 34 40 13 33 42 12 35 15 38 33 7 59 42 0 0 34 16 44 0 50 30 30 216 -23 34 45 55 33 47 51 35 21 23 33 13 35 43 0 0 34 22 47 0 50 20 30 217 -22 34 52 1 33 53 52 35 27 32 33 19 34 44 0 0 34 29 15 0 50 10 29 217 -22 34 58 31 34 0 17 35 34 4 33 25 56 45 0 0 34 36 5 0 50 1 29 218 -21 35 5 24 34 7 5 35 41 0 33 32 41 46 0 0 34 43 19 0 49 51 28 219 -20 35 12 40 34 14 17 35 48 20 33 39 50 47 0 0 34 50 57 0 49 42 27 220 -19 35 20 20 34 21 52 35 56 3 33 47 22 48 0 0 34 58 57 0 49 33 27 221 -19 35 28 24 34 29 49 36 4 10 33 55 16 49 0 0 35 7 21 0 49 24 26 222 -18 35 36 50 34 38 10 36 12 41 34 3 34 50 0 0 35 16 7 0 49 16 26 222 -17 35 45 40 34 46 54 36 21 34 34 12 14 51 0 0 35 25 17 0 49 7 25 223 -16 35 54 53 34 56 0 36 30 51 34 21 17 52 0 0 35 34 49 0 48 59 24 224 -15 36 4 29 35 5 30 36 40 31 34 30 43 53 0 0 35 44 44 0 48 51 24 225 -15 36 14 27 35 15 21 36 50 33 34 40 30 54 0 0 35 55 2 0 48 43 23 225 -14 36 24 48 35 25 35 37 0 59 34 50 40 55 0 0 36 5 42 0 48 36 22 226 -13 36 35 32 35 36 12 37 11 47 35 1 13 56 0 0 36 16 44 0 48 28 22 227 -12 36 46 38 35 47 10 37 22 58 35 12 7 57 0 0 36 28 8 0 48 21 21 228 -11 36 58 6 35 58 31 37 34 31 35 23 23 58 0 0 36 39 54 0 48 14 20 228 -11 37 9 56 36 10 13 37 46 26 35 35 1 59 0 0 36 52 2 0 48 7 19 229 -10 37 22 8 36 22 16 37 58 43 35 47 0 60 0 0 37 4 31 0 48 1 19 230 -9 37 34 41 36 34 42 38 11 21 35 59 20 61 0 0 37 17 21 0 47 55 18 230 -8 37 47 36 36 47 28 38 24 21 36 12 2 62 0 0 37 30 33 0 47 49 17 231 -7 38 0 52 37 0 35 38 37 43 36 25 4 63 0 0 37 44 5 0 47 43 16 232 -7 38 14 28 37 14 3 38 51 25 36 38 27 64 0 0 37 57 58 0 47 37 16 233 -6 38 28 26 37 27 51 39 5 28 36 52 10 65 0 0 38 12 11 0 47 32 15 233 -5 38 42 44 37 42 0 39 19 52 37 6 13 66 0 0 38 26 44 0 47 27 14 234 -4 38 57 22 37 56 29 39 34 36 37 20 37 67 0 0 38 41 37 0 47 22 13 235 -3 39 12 19 38 11 17 39 49 40 37 35 19 68 0 0 38 56 50 0 47 18 13 235 -3 39 27 37 38 26 24 40 5 3 37 50 22 69 0 0 39 12 21 0 47 14 12 236 -2 39 43 13 38 41 51 40 20 46 38 5 43 70 0 0 39 28 12 0 47 10 11 237 -1 39 59 9 38 57 37 40 36 48 38 21 23 71 0 0 39 44 20 0 47 6 10 237 0 40 15 23 39 13 40 40 53 8 38 37 21 Uncertainty in time = +/- 6 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: UCAC2 25324990 * constellation : Libra * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 14 52 17.6574 DE: -17 13 56.442 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .041, .041 ) * V mag [mag]: 11.7 * B mag [mag]: 0.0 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (207) Hedda approx. diameter [km]: 66 approx. diameter ["]: .072 distance from Earth [AU]: 1.26500 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 809 number of rejected observations: 111 time covered by the observations: 1903 Sep 23 - 2008 Feb 18 1 sigma uncertainty ellipse (major, minor, PA): 0.030, 0.014, 111° remarks: * orbital elements for (207) Hedda : Mean anomaly = 353.67234681 deg Arg. of pericenter = 192.76636519 deg Long. of node = 29.27518856 deg Inclination = 3.80258288 deg Eccentricity = 0.02821924 Semimajor axis = 2.28373950 AU Perihelion dist = 2.21929409 AU Mag: H = 9.92, G = 0.15 Epoch of elements : MJD 54933.03900000 TDT (2009 Apr 12.039) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Apr 12 207 Hedda 0h 55.8m UT 11.7 14 52 17.657-17 13 56.44UCAC2 25324990 0.0 12.8 66 9.0 1.265 -1.979 2.68 8.7477 -17.232 166.26 8.67 0.9305 0.07354 0.77781 -4.07450 0.38516 -0.00207 0.00070 2000 352.8044572009 4 9.00000192.766365 29.275189 3.8025830.02821924 2.2837395 2.2192941 9.9 5.00.15 RATE 2.8558420 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.051 0.043 97 1.60 0.043 0 54545.5020090412_324990 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 07:02 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org