IOTA/IOTA-ES occultation update for (339) Dorothea / TYC 0735-02885-1 event on 2009 Jan 06, 13:51 UT Visible from Summary ------- On 2009 Jan 06 UT, the 38 km diameter asteroid (339) Dorothea will occult a 11.5 mag star in the constellation Monoceros for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.5 mag to 13.9 mag (the magnitude of the asteroid) for at most 2.8 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: 55 * date and approx. time of event: 2009 Jan 06, 13:46 - 2009 Jan 06, 13:56 UT * magnitude of target star: 11.5 * magnitude drop [mag]: 2.5 * estimated maximum duration [s]: 2.8 * Moon: 73 % sunlit, 55° distance * Sun: 163° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 56 * 1 sigma uncertainty interval [path widths]: +/- 1.14 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .027) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .027", 90° ) * approx speed of asteroid's shadow [km/s]: 13.5558 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0735-02885-1 by 339 Dorothea on 2009 Jan 6 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 79 0 0 -34 5 25 13 56 4 17 65 0 -33 50 6 -34 20 49 -33 15 25 -34 56 14 80 0 0 -34 1 27 13 56 1 18 65 -1 -33 46 8 -34 16 50 -33 11 29 -34 52 13 81 0 0 -33 57 46 13 55 58 19 64 -2 -33 42 28 -34 13 9 -33 7 50 -34 48 31 82 0 0 -33 54 24 13 55 54 20 63 -3 -33 39 6 -34 9 47 -33 4 29 -34 45 7 83 0 0 -33 51 20 13 55 51 20 63 -3 -33 36 3 -34 6 42 -33 1 27 -34 42 2 84 0 0 -33 48 35 13 55 47 21 62 -4 -33 33 18 -34 3 57 -32 58 43 -34 39 15 85 0 0 -33 46 8 13 55 44 22 61 -5 -33 30 51 -34 1 29 -32 56 17 -34 36 47 86 0 0 -33 43 59 13 55 40 23 61 -5 -33 28 43 -33 59 20 -32 54 9 -34 34 37 87 0 0 -33 42 9 13 55 36 23 60 -6 -33 26 53 -33 57 29 -32 52 20 -34 32 45 88 0 0 -33 40 37 13 55 32 24 59 -7 -33 25 21 -33 55 57 -32 50 49 -34 31 13 89 0 0 -33 39 23 13 55 28 25 58 -8 -33 24 8 -33 54 43 -32 49 36 -34 29 58 90 0 0 -33 38 28 13 55 24 25 58 -8 -33 23 13 -33 53 48 -32 48 42 -34 29 3 91 0 0 -33 37 52 13 55 19 26 57 -9 -33 22 36 -33 53 11 -32 48 6 -34 28 25 92 0 0 -33 37 33 13 55 15 27 56 -10 -33 22 18 -33 52 53 -32 47 48 -34 28 7 93 0 0 -33 37 33 13 55 10 28 55 -10 -33 22 18 -33 52 53 -32 47 48 -34 28 6 94 0 0 -33 37 52 13 55 6 28 55 -11 -33 22 37 -33 53 11 -32 48 7 -34 28 25 95 0 0 -33 38 29 13 55 1 29 54 -12 -33 23 14 -33 53 48 -32 48 44 -34 29 1 96 0 0 -33 39 24 13 54 56 29 53 -12 -33 24 9 -33 54 43 -32 49 39 -34 29 57 97 0 0 -33 40 37 13 54 51 30 52 -13 -33 25 22 -33 55 56 -32 50 52 -34 31 10 98 0 0 -33 42 8 13 54 46 31 51 -13 -33 26 53 -33 57 28 -32 52 23 -34 32 42 99 0 0 -33 43 58 13 54 41 31 50 -14 -33 28 43 -33 59 18 -32 54 12 -34 34 32 100 0 0 -33 46 6 13 54 36 32 50 -15 -33 30 50 -34 1 26 -32 56 19 -34 36 40 101 0 0 -33 48 32 13 54 30 33 49 -15 -33 33 16 -34 3 52 -32 58 44 -34 39 7 102 0 0 -33 51 15 13 54 25 33 48 -16 -33 35 59 -34 6 36 -33 1 27 -34 41 51 103 0 0 -33 54 17 13 54 20 34 47 -16 -33 39 1 -34 9 38 -33 4 28 -34 44 54 104 0 0 -33 57 36 13 54 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16 131 0 0 -37 12 2 13 51 26 42 14 -27 -36 56 26 -37 27 44 -36 21 7 -38 3 49 132 0 0 -37 22 45 13 51 19 42 13 -27 -37 7 7 -37 38 27 -36 31 46 -38 14 35 133 0 0 -37 33 40 13 51 13 42 12 -27 -37 18 1 -37 49 24 -36 42 38 -38 25 34 134 0 0 -37 44 49 13 51 6 42 10 -27 -37 29 9 -38 0 33 -36 53 43 -38 36 46 135 0 0 -37 56 10 13 51 0 42 9 -27 -37 40 29 -38 11 56 -37 5 1 -38 48 11 136 0 0 -38 7 43 13 50 53 42 8 -27 -37 52 1 -38 23 30 -37 16 30 -38 59 48 137 0 0 -38 19 28 13 50 47 42 6 -27 -38 3 45 -38 35 16 -37 28 12 -39 11 37 138 0 0 -38 31 25 13 50 40 42 5 -27 -38 15 40 -38 47 14 -37 40 5 -39 23 38 139 0 0 -38 43 33 13 50 34 42 4 -27 -38 27 48 -38 59 24 -37 52 10 -39 35 50 140 0 0 -38 55 53 13 50 27 42 2 -27 -38 40 6 -39 11 45 -38 4 25 -39 48 14 141 0 0 -39 8 24 13 50 21 41 1 -27 -38 52 36 -39 24 17 -38 16 52 -40 0 49 142 0 0 -39 21 5 13 50 15 41 360 -27 -39 5 16 -39 36 59 -38 29 29 -40 13 34 143 0 0 -39 33 56 13 50 9 41 359 -27 -39 18 6 -39 49 52 -38 42 17 -40 26 29 144 0 0 -39 46 58 13 50 2 41 357 -27 -39 31 6 -40 2 54 -38 55 15 -40 39 35 145 0 0 -40 0 9 13 49 56 41 356 -27 -39 44 16 -40 16 7 -39 8 22 -40 52 50 146 0 0 -40 13 30 13 49 50 40 355 -27 -39 57 36 -40 29 29 -39 21 39 -41 6 15 147 0 0 -40 26 59 13 49 44 40 354 -27 -40 11 4 -40 43 0 -39 35 5 -41 19 48 148 0 0 -40 40 38 13 49 38 40 352 -27 -40 24 42 -40 56 39 -39 48 40 -41 33 31 149 0 0 -40 54 25 13 49 32 39 351 -27 -40 38 27 -41 10 27 -40 2 23 -41 47 22 150 0 0 -41 8 20 13 49 26 39 350 -26 -40 52 21 -41 24 24 -40 16 14 -42 1 21 151 0 0 -41 22 23 13 49 20 39 349 -26 -41 6 23 -41 38 28 -40 30 13 -42 15 28 152 0 0 -41 36 33 13 49 14 38 348 -26 -41 20 32 -41 52 39 -40 44 20 -42 29 42 153 0 0 -41 50 50 13 49 8 38 346 -26 -41 34 48 -42 6 58 -40 58 34 -42 44 3 154 0 0 -42 5 15 13 49 3 37 345 -26 -41 49 12 -42 21 23 -41 12 54 -42 58 31 155 0 0 -42 19 45 13 48 57 37 344 -25 -42 3 41 -42 35 55 -41 27 22 -43 13 5 156 0 0 -42 34 22 13 48 52 37 343 -25 -42 18 17 -42 50 33 -41 41 55 -43 27 46 157 0 0 -42 49 5 13 48 46 36 342 -25 -42 32 58 -43 5 16 -41 56 34 -43 42 32 158 0 0 -43 3 52 13 48 41 36 341 -25 -42 47 45 -43 20 5 -42 11 18 -43 57 23 159 0 0 -43 18 45 13 48 35 35 340 -24 -43 2 37 -43 34 59 -42 26 8 -44 12 20 160 0 0 -43 33 43 13 48 30 35 339 -24 -43 17 33 -43 49 58 -42 41 2 -44 27 21 161 0 0 -43 48 45 13 48 25 34 338 -24 -43 32 34 -44 5 1 -42 56 1 -44 42 26 162 0 0 -44 3 51 13 48 20 34 337 -23 -43 47 39 -44 20 7 -43 11 4 -44 57 35 163 0 0 -44 19 0 13 48 15 33 336 -23 -44 2 48 -44 35 18 -43 26 10 -45 12 48 164 0 0 -44 34 13 13 48 10 33 334 -23 -44 17 59 -44 50 31 -43 41 20 -45 28 3 165 0 0 -44 49 28 13 48 5 32 333 -22 -44 33 14 -45 5 48 -43 56 32 -45 43 22 166 0 0 -45 4 46 13 48 0 32 332 -22 -44 48 31 -45 21 6 -44 11 48 -45 58 43 167 0 0 -45 20 6 13 47 56 31 331 -21 -45 3 50 -45 36 27 -44 27 5 -46 14 6 168 0 0 -45 35 28 13 47 51 30 330 -21 -45 19 11 -45 51 50 -44 42 25 -46 29 30 169 0 0 -45 50 51 13 47 47 30 330 -21 -45 34 34 -46 7 14 -44 57 45 -46 44 56 170 0 0 -46 6 16 13 47 42 29 329 -20 -45 49 58 -46 22 39 -45 13 8 -47 0 23 171 0 0 -46 21 41 13 47 38 29 328 -20 -46 5 22 -46 38 5 -45 28 30 -47 15 50 172 0 0 -46 37 6 13 47 34 28 327 -19 -46 20 47 -46 53 31 -45 43 54 -47 31 17 173 0 0 -46 52 31 13 47 30 28 326 -19 -46 36 12 -47 8 57 -45 59 17 -47 46 45 174 0 0 -47 7 56 13 47 26 27 325 -18 -46 51 36 -47 24 22 -46 14 40 -48 2 12 175 0 0 -47 23 21 13 47 22 26 324 -18 -47 7 0 -47 39 47 -46 30 3 -48 17 38 176 0 0 -47 38 44 13 47 18 26 323 -17 -47 22 22 -47 55 11 -46 45 25 -48 33 2 177 0 0 -47 54 5 13 47 14 25 322 -17 -47 37 43 -48 10 33 -47 0 45 -48 48 25 178 0 0 -48 9 25 13 47 10 25 321 -17 -47 53 3 -48 25 53 -47 16 3 -49 3 47 179 0 0 -48 24 43 13 47 7 24 320 -16 -48 8 20 -48 41 11 -47 31 20 -49 19 5 180 0 0 -48 39 58 13 47 4 23 319 -16 -48 23 35 -48 56 27 -47 46 34 -49 34 22 -179 0 0 -48 55 11 13 47 0 23 318 -15 -48 38 48 -49 11 40 -48 1 46 -49 49 35 -178 0 0 -49 10 20 13 46 57 22 318 -15 -48 53 57 -49 26 49 -48 16 55 -50 4 45 -177 0 0 -49 25 26 13 46 54 21 317 -14 -49 9 3 -49 41 55 -48 32 0 -50 19 52 -176 0 0 -49 40 28 13 46 51 21 316 -14 -49 24 5 -49 56 57 -48 47 2 -50 34 54 -175 0 0 -49 55 26 13 46 48 20 315 -13 -49 39 3 -50 11 56 -49 2 0 -50 49 52 -174 0 0 -50 10 20 13 46 45 20 314 -12 -49 53 56 -50 26 49 -49 16 54 -51 4 46 -173 0 0 -50 25 9 13 46 42 19 313 -12 -50 8 46 -50 41 38 -49 31 43 -51 19 35 -172 0 0 -50 39 53 13 46 40 18 312 -11 -50 23 30 -50 56 22 -49 46 27 -51 34 19 -171 0 0 -50 54 32 13 46 37 18 312 -11 -50 38 9 -51 11 1 -50 1 6 -51 48 57 -170 0 0 -51 9 5 13 46 35 17 311 -10 -50 52 42 -51 25 34 -50 15 40 -52 3 30 -169 0 0 -51 23 33 13 46 32 16 310 -10 -51 7 10 -51 40 1 -50 30 8 -52 17 56 -168 0 0 -51 37 54 13 46 30 16 309 -9 -51 21 31 -51 54 22 -50 44 31 -52 32 17 -167 0 0 -51 52 9 13 46 28 15 308 -9 -51 35 46 -52 8 37 -50 58 46 -52 46 31 -166 0 0 -52 6 17 13 46 26 15 307 -8 -51 49 55 -52 22 45 -51 12 56 -53 0 38 -165 0 0 -52 20 19 13 46 24 14 307 -8 -52 3 57 -52 36 46 -51 26 59 -53 14 38 -164 0 0 -52 34 13 13 46 22 13 306 -7 -52 17 52 -52 50 40 -51 40 54 -53 28 31 -163 0 0 -52 48 0 13 46 20 13 305 -6 -52 31 39 -53 4 26 -51 54 43 -53 42 16 -162 0 0 -53 1 39 13 46 19 12 304 -6 -52 45 19 -53 18 5 -52 8 24 -53 55 54 -161 0 0 -53 15 11 13 46 17 11 303 -5 -52 58 51 -53 31 36 -52 21 58 -54 9 23 -160 0 0 -53 28 35 13 46 16 11 303 -5 -53 12 16 -53 44 59 -52 35 23 -54 22 45 -159 0 0 -53 41 50 13 46 14 10 302 -4 -53 25 32 -53 58 14 -52 48 41 -54 35 58 -158 0 0 -53 54 57 13 46 13 10 301 -4 -53 38 40 -54 11 20 -53 1 50 -54 49 3 -157 0 0 -54 7 56 13 46 12 9 300 -3 -53 51 39 -54 24 18 -53 14 51 -55 1 58 -156 0 0 -54 20 45 13 46 11 8 299 -3 -54 4 29 -54 37 7 -53 27 43 -55 14 45 -155 0 0 -54 33 26 13 46 10 8 298 -2 -54 17 11 -54 49 47 -53 40 27 -55 27 23 -154 0 0 -54 45 58 13 46 9 7 298 -1 -54 29 43 -55 2 17 -53 53 1 -55 39 52 -153 0 0 -54 58 20 13 46 8 7 297 -1 -54 42 6 -55 14 39 -54 5 26 -55 52 11 -152 0 0 -55 10 33 13 46 7 6 296 0 -54 54 20 -55 26 51 -54 17 42 -56 4 21 Uncertainty in time = +/- 5 secs [Prediction of 2008 Nov 4.0] Data for the target star ------------------------ * name: TYC 0735-02885-1 * constellation : Monoceros * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 06 22 33.6600 DE: +09 31 50.263 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .029, .021 ) * V mag [mag]: 11.5 * B mag [mag]: 11.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (339) Dorothea approx. diameter [km]: 38 approx. diameter ["]: .024 distance from Earth [AU]: 2.20300 * orbital information: orbit source: Preston date of fit: 2008 Nov 03 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 792 number of rejected observations: 82 time covered by the observations: 1902 Aug 07 - 2008 Oct 19 1 sigma uncertainty ellipse (major, minor, PA): 0.026, 0.017, 91° remarks: * orbital elements for (339) Dorothea : Mean anomaly = 114.80758259 deg Arg. of pericenter = 160.88559544 deg Long. of node = 173.77803302 deg Inclination = 9.92822063 deg Eccentricity = 0.09481400 Semimajor axis = 3.01421408 AU Perihelion dist = 2.72842437 AU Mag: H = 9.31, G = 0.15 Epoch of elements : MJD 54837.57700000 TDT (2009 Jan 06.577) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Jan 6 339 Dorothea 13h 51.3m UT 11.5 6 22 33.660 9 31 50.26TYC 0735-02885-1 11.5 13.9 38 2.8 2.203 -2.030 5.56 141.5316 9.528 -26.33 -22.43 13.8554 -0.13418 -0.72514 -7.52355 1.39228 0.00119 0.00136 2000 113.38053020081230.00000160.885595173.778033 9.9282210.09481400 3.0142141 2.7284244 9.2 5.00.15 RATE 1.8834010 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.027 90 2.14 0.027 0 54774.5020090106_2885-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 04, 05:23 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org