IOTA/IOTA-ES occultation update for (12444) Prothoon / TYC 0371-00513-1 event on 2009 Jul 08, 21:29 UT Visible from Summary ------- On 2009 Jul 08 UT, the 64 km diameter asteroid (12444) Prothoon will occult a 11.6 mag star in the constellation Serpens for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.7 mag to 17.3 mag (the magnitude of the asteroid) for at most 7.6 seconds. This update is based on historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 12 * date and approx. time of event: 2009 Jul 08, 21:23 - 2009 Jul 08, 21:32 UT * magnitude of target star: 11.6 * magnitude drop [mag]: 5.7 * estimated maximum duration [s]: 7.6 * Moon: 98 % sunlit, 64° distance * Sun: 130° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 101 * 1 sigma uncertainty interval [path widths]: +/- 5.41 * 1 sigma uncertainty interval [seconds]: +/- 102.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .285 +/- .118) * 1 sigma uncertainty ellipse (major, minor, PA): ( .298", .078", 72° ) * approx speed of asteroid's shadow [km/s]: 8.4986 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0371-00513-1 by 12444 Prothoon on 2009 Jul 8 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 - 18 0 0 53 16 59 21 32 37 38 165 0 53 44 38 52 49 36 59 4 20 48 8 28 - 17 0 0 53 18 31 21 32 30 38 166 -1 53 46 9 52 51 8 59 5 51 48 10 0 - 16 0 0 53 20 0 21 32 22 39 168 -1 53 47 39 52 52 38 59 7 20 48 11 30 - 15 0 0 53 21 27 21 32 15 39 169 -2 53 49 6 52 54 5 59 8 46 48 12 57 - 14 0 0 53 22 52 21 32 7 39 170 -2 53 50 31 52 55 30 59 10 11 48 14 23 - 13 0 0 53 24 15 21 32 0 39 171 -2 53 51 54 52 56 53 59 11 33 48 15 46 - 12 0 0 53 25 36 21 31 52 39 173 -3 53 53 14 52 58 14 59 12 53 48 17 7 - 11 0 0 53 26 54 21 31 45 39 174 -3 53 54 33 52 59 32 59 14 11 48 18 26 - 10 0 0 53 28 10 21 31 37 39 175 -4 53 55 48 53 0 48 59 15 26 48 19 42 - 9 0 0 53 29 24 21 31 30 39 176 -4 53 57 2 53 2 2 59 16 39 48 20 56 - 8 0 0 53 30 35 21 31 22 39 178 -4 53 58 13 53 3 13 59 17 50 48 22 8 - 7 0 0 53 31 44 21 31 14 39 179 -5 53 59 22 53 4 22 59 18 58 48 23 17 - 6 0 0 53 32 51 21 31 7 39 180 -5 54 0 29 53 5 29 59 20 4 48 24 24 - 5 0 0 53 33 55 21 30 59 39 181 -5 54 1 33 53 6 33 59 21 8 48 25 29 - 4 0 0 53 34 57 21 30 52 39 183 -6 54 2 35 53 7 35 59 22 9 48 26 31 - 3 0 0 53 35 56 21 30 44 39 184 -6 54 3 34 53 8 34 59 23 8 48 27 31 - 2 0 0 53 36 53 21 30 37 39 185 -6 54 4 31 53 9 31 59 24 4 48 28 28 - 1 0 0 53 37 47 21 30 29 39 186 -7 54 5 25 53 10 26 59 24 58 48 29 23 0 0 0 53 38 39 21 30 22 39 187 -7 54 6 17 53 11 18 59 25 49 48 30 15 1 0 0 53 39 29 21 30 14 39 189 -7 54 7 7 53 12 7 59 26 38 48 31 5 2 0 0 53 40 16 21 30 7 38 190 -8 54 7 54 53 12 54 59 27 25 48 31 53 3 0 0 53 41 1 21 29 59 38 191 -8 54 8 38 53 13 39 59 28 9 48 32 37 4 0 0 53 41 43 21 29 52 38 192 -8 54 9 21 53 14 21 59 28 51 48 33 20 5 0 0 53 42 22 21 29 45 38 194 -9 54 10 0 53 15 1 59 29 30 48 34 0 6 0 0 53 42 59 21 29 37 38 195 -9 54 10 37 53 15 38 59 30 6 48 34 37 7 0 0 53 43 34 21 29 30 38 196 -9 54 11 12 53 16 12 59 30 40 48 35 12 8 0 0 53 44 6 21 29 23 38 197 -9 54 11 44 53 16 44 59 31 12 48 35 44 9 0 0 53 44 35 21 29 15 37 198 -10 54 12 13 53 17 14 59 31 41 48 36 14 10 0 0 53 45 2 21 29 8 37 200 -10 54 12 40 53 17 41 59 32 7 48 36 41 11 0 0 53 45 27 21 29 1 37 201 -10 54 13 4 53 18 5 59 32 31 48 37 6 12 0 0 53 45 48 21 28 54 37 202 -10 54 13 26 53 18 27 59 32 53 48 37 28 13 0 0 53 46 7 21 28 46 37 203 -11 54 13 45 53 18 46 59 33 11 48 37 48 14 0 0 53 46 24 21 28 39 36 204 -11 54 14 2 53 19 3 59 33 28 48 38 4 15 0 0 53 46 38 21 28 32 36 206 -11 54 14 16 53 19 17 59 33 41 48 38 19 16 0 0 53 46 49 21 28 25 36 207 -11 54 14 27 53 19 28 59 33 52 48 38 30 17 0 0 53 46 58 21 28 18 36 208 -12 54 14 36 53 19 37 59 34 1 48 38 39 18 0 0 53 47 5 21 28 11 35 209 -12 54 14 42 53 19 43 59 34 7 48 38 46 19 0 0 53 47 8 21 28 4 35 210 -12 54 14 46 53 19 47 59 34 10 48 38 50 20 0 0 53 47 9 21 27 58 35 211 -12 54 14 47 53 19 48 59 34 11 48 38 51 21 0 0 53 47 8 21 27 51 34 212 -12 54 14 45 53 19 47 59 34 9 48 38 50 22 0 0 53 47 3 21 27 44 34 214 -13 54 14 41 53 19 42 59 34 5 48 38 46 23 0 0 53 46 57 21 27 37 34 215 -13 54 14 34 53 19 36 59 33 58 48 38 39 24 0 0 53 46 47 21 27 31 33 216 -13 54 14 25 53 19 26 59 33 48 48 38 30 25 0 0 53 46 35 21 27 24 33 217 -13 54 14 13 53 19 14 59 33 36 48 38 18 26 0 0 53 46 21 21 27 18 33 218 -13 54 13 58 53 19 0 59 33 21 48 38 4 27 0 0 53 46 3 21 27 11 32 219 -13 54 13 41 53 18 42 59 33 4 48 37 46 28 0 0 53 45 44 21 27 5 32 220 -13 54 13 21 53 18 23 59 32 44 48 37 27 29 0 0 53 45 21 21 26 58 32 221 -13 54 12 58 53 18 0 59 32 21 48 37 4 30 0 0 53 44 56 21 26 52 31 222 -14 54 12 33 53 17 35 59 31 56 48 36 40 31 0 0 53 44 29 21 26 46 31 223 -14 54 12 6 53 17 8 59 31 29 48 36 12 32 0 0 53 43 58 21 26 40 30 224 -14 54 11 36 53 16 37 59 30 58 48 35 42 33 0 0 53 43 26 21 26 34 30 225 -14 54 11 3 53 16 5 59 30 26 48 35 9 34 0 0 53 42 50 21 26 28 30 226 -14 54 10 28 53 15 29 59 29 50 48 34 34 35 0 0 53 42 12 21 26 22 29 227 -14 54 9 50 53 14 51 59 29 12 48 33 56 36 0 0 53 41 32 21 26 16 29 228 -14 54 9 9 53 14 11 59 28 32 48 33 16 37 0 0 53 40 49 21 26 10 28 229 -14 54 8 26 53 13 28 59 27 49 48 32 33 38 0 0 53 40 3 21 26 4 28 230 -14 54 7 41 53 12 42 59 27 4 48 31 47 39 0 0 53 39 15 21 25 59 28 231 -14 54 6 52 53 11 54 59 26 16 48 30 59 40 0 0 53 38 25 21 25 53 27 232 -14 54 6 2 53 11 4 59 25 25 48 30 8 41 0 0 53 37 31 21 25 48 27 233 -14 54 5 9 53 10 10 59 24 32 48 29 15 42 0 0 53 36 36 21 25 42 26 234 -14 54 4 13 53 9 15 59 23 36 48 28 19 43 0 0 53 35 37 21 25 37 26 235 -14 54 3 15 53 8 16 59 22 38 48 27 21 44 0 0 53 34 37 21 25 32 25 236 -14 54 2 14 53 7 16 59 21 38 48 26 20 45 0 0 53 33 34 21 25 27 25 237 -14 54 1 11 53 6 13 59 20 35 48 25 17 46 0 0 53 32 28 21 25 22 24 238 -14 54 0 5 53 5 7 59 19 30 48 24 11 47 0 0 53 31 20 21 25 17 24 239 -14 53 58 57 53 3 59 59 18 22 48 23 3 48 0 0 53 30 9 21 25 12 23 240 -14 53 57 47 53 2 48 59 17 12 48 21 52 49 0 0 53 28 56 21 25 7 23 241 -14 53 56 34 53 1 35 59 15 59 48 20 39 50 0 0 53 27 41 21 25 2 22 242 -14 53 55 18 53 0 20 59 14 44 48 19 24 51 0 0 53 26 23 21 24 58 22 243 -14 53 54 0 52 59 2 59 13 26 48 18 6 52 0 0 53 25 3 21 24 53 21 243 -14 53 52 40 52 57 42 59 12 7 48 16 45 53 0 0 53 23 40 21 24 49 21 244 -14 53 51 18 52 56 19 59 10 44 48 15 23 54 0 0 53 22 15 21 24 45 20 245 -13 53 49 53 52 54 54 59 9 20 48 13 57 55 0 0 53 20 48 21 24 41 20 246 -13 53 48 26 52 53 27 59 7 53 48 12 30 56 0 0 53 19 19 21 24 36 19 247 -13 53 46 56 52 51 57 59 6 24 48 11 0 57 0 0 53 17 47 21 24 32 19 248 -13 53 45 24 52 50 26 59 4 53 48 9 28 58 0 0 53 16 13 21 24 29 18 249 -13 53 43 50 52 48 51 59 3 19 48 7 54 59 0 0 53 14 36 21 24 25 18 250 -13 53 42 14 52 47 15 59 1 43 48 6 17 60 0 0 53 12 58 21 24 21 17 250 -13 53 40 35 52 45 36 59 0 5 48 4 38 61 0 0 53 11 17 21 24 18 17 251 -12 53 38 55 52 43 56 58 58 25 48 2 57 62 0 0 53 9 34 21 24 14 16 252 -12 53 37 12 52 42 13 58 56 42 48 1 14 63 0 0 53 7 49 21 24 11 15 253 -12 53 35 27 52 40 27 58 54 58 47 59 29 64 0 0 53 6 2 21 24 8 15 254 -12 53 33 39 52 38 40 58 53 11 47 57 41 65 0 0 53 4 12 21 24 4 14 255 -12 53 31 50 52 36 51 58 51 22 .. .. .. 66 0 0 53 2 21 21 24 1 14 255 -11 53 29 58 52 34 59 58 49 31 .. .. .. 67 0 0 53 0 27 21 23 59 13 256 -11 53 28 5 52 33 5 58 47 38 .. .. .. 68 0 0 52 58 31 21 23 56 13 257 -11 53 26 9 52 31 10 58 45 43 .. .. .. 69 0 0 52 56 34 21 23 53 12 258 -11 53 24 11 52 29 12 58 43 46 .. .. .. 70 0 0 52 54 34 21 23 51 11 259 -11 53 22 12 52 27 12 58 41 47 .. .. .. 71 0 0 52 52 32 21 23 48 11 260 -10 53 20 10 52 25 11 58 39 46 .. .. .. 72 0 0 52 50 29 21 23 46 10 260 -10 53 18 7 52 23 7 58 37 43 .. .. .. 73 0 0 52 48 23 21 23 44 10 261 -10 53 16 1 52 21 1 58 35 38 .. .. .. 74 0 0 52 46 16 21 23 42 9 262 -10 53 13 54 52 18 54 58 33 31 .. .. .. 75 0 0 52 44 7 21 23 40 8 263 -9 53 11 45 52 16 45 58 31 22 .. .. .. 76 0 0 52 41 56 21 23 38 8 264 -9 53 9 34 52 14 34 58 29 12 .. .. .. 77 0 0 52 39 43 21 23 36 7 264 -9 53 7 21 52 12 21 58 27 0 .. .. .. 78 0 0 52 37 28 21 23 35 7 265 -8 53 5 7 52 10 6 58 24 46 .. .. .. 79 0 0 52 35 12 21 23 33 6 266 -8 53 2 51 52 7 50 58 22 30 .. .. .. 80 0 0 52 32 54 21 23 32 5 267 -8 53 0 33 52 5 32 58 20 13 .. .. .. 81 0 0 52 30 35 21 23 31 5 268 -7 52 58 13 52 3 13 58 17 54 .. .. .. 82 0 0 52 28 14 21 23 30 4 268 -7 52 55 52 52 0 51 58 15 34 .. .. .. 83 0 0 52 25 51 21 23 29 4 269 -7 52 53 29 51 58 29 58 13 11 .. .. .. 84 0 0 52 23 26 21 23 28 3 270 -6 52 51 5 51 56 4 58 10 48 .. .. .. 85 0 0 52 21 1 21 23 28 2 271 -6 52 48 39 51 53 38 58 8 23 .. .. .. 86 0 0 52 18 33 21 23 27 2 272 -6 52 46 12 51 51 11 58 5 56 .. .. .. 87 0 0 52 16 5 21 23 27 1 272 -5 52 43 43 51 48 42 58 3 28 .. .. .. 88 0 0 52 13 35 21 23 27 1 273 -5 52 41 13 51 46 12 58 0 58 .. .. .. Uncertainty in time = +/- 107 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 0371-00513-1 * constellation : Serpens * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 14 23.4189 DE: +02 26 03.930 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .026, .028 ) * V mag [mag]: 11.6 * B mag [mag]: 12.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (12444) Prothoon approx. diameter [km]: 64 approx. diameter ["]: .021 distance from Earth [AU]: 4.19000 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: MPC (via Astdys) number of used observations: 479 number of rejected observations: 10 time covered by the observations: 1996 Mar 24 - 2008 Jan 16 1 sigma uncertainty ellipse (major, minor, PA): 0.297, 0.073, 72° remarks: * orbital elements for (12444) Prothoon : Mean anomaly = 339.41323554 deg Arg. of pericenter = 64.95713200 deg Long. of node = 213.19838918 deg Inclination = 30.81080142 deg Eccentricity = 0.07215204 Semimajor axis = 5.25740177 AU Perihelion dist = 4.87806952 AU Mag: H = 9.68, G = 0.15 Epoch of elements : MJD 55020.89500000 TDT (2009 Jul 08.895) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jul 8 12444 Prothoon 21h 31.3m UT 11.6 16 14 23.419 2 26 3.93TYC 0371-00513-1 12.4 17.3 64 7.6 4.190 -0.671 -0.20 -6.1976 2.435 -141.53 22.38 21.5220 -0.01620 0.77463 -4.79591 -0.09484 0.00372 -0.00235 2000 339.3400602009 7 8.00000 64.957132213.198389 30.8108010.07215204 5.2574018 4.878069510.1 5.00.15 RATE 0.8176120 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.298 0.078 72 6.41 0.114 0 54545.5020090708_0513-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 10:31 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org