IOTA/IOTA-ES occultation update for (317) Roxane / TYC 1233-01012-1 event on 2009 Oct 18, 10:05 UT Visible from N Canada Summary ------- On 2009 Oct 18 UT, the 19 km diameter asteroid (317) Roxane will occult a 11.4 mag star in the constellation Aries for observers along a path across N Canada. In the case of an occultation, the combined light of the asteroid and the star will drop by 1.7 mag to 12.9 mag (the magnitude of the asteroid) for at most 2.6 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: 26 * date and approx. time of event: 2009 Oct 18, 09:54 - 2009 Oct 18, 10:17 UT * magnitude of target star: 11.4 * magnitude drop [mag]: 1.7 * estimated maximum duration [s]: 2.6 * Moon: 0 % sunlit, 155° distance * Sun: 153° distance * rough path description: N Canada The occultation path -------------------- * approximate projected width [km]: 24 * 1 sigma uncertainty interval [path widths]: +/- 2.58 * 1 sigma uncertainty interval [seconds]: +/- 6.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .054 +/- .054) * 1 sigma uncertainty ellipse (major, minor, PA): ( .054", .054", 359° ) * approx speed of asteroid's shadow [km/s]: 7.1535 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1233-01012-1 by 317 Roxane on 2009 Oct 18 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 135 0 0 16 0 36 10 17 27 1 74 -25 16 7 12 15 54 0 16 41 26 .. .. .. 136 0 0 16 17 53 10 17 26 2 74 -26 16 24 30 16 11 17 16 58 48 .. .. .. 137 0 0 16 35 37 10 17 25 3 75 -27 16 42 15 16 29 0 17 16 38 .. .. .. 138 0 0 16 53 49 10 17 24 4 75 -28 17 0 27 16 47 11 17 34 54 .. .. .. 139 0 0 17 12 26 10 17 23 5 75 -29 17 19 6 17 5 47 17 53 37 .. .. .. 140 0 0 17 31 30 10 17 21 6 76 -30 17 38 10 17 24 50 18 12 46 16 50 36 141 0 0 17 50 59 10 17 19 7 76 -30 17 57 40 17 44 18 18 32 21 17 9 59 142 0 0 18 10 53 10 17 17 8 76 -31 18 17 35 18 4 11 18 52 20 17 29 48 143 0 0 18 31 11 10 17 14 9 77 -32 18 37 54 18 24 29 19 12 44 17 50 1 144 0 0 18 51 54 10 17 11 10 77 -33 18 58 38 18 45 10 19 33 33 18 10 37 145 0 0 19 13 0 10 17 8 11 77 -34 19 19 45 19 6 15 19 54 45 18 31 38 146 0 0 19 34 29 10 17 4 12 78 -35 19 41 15 19 27 43 20 16 20 18 53 1 147 0 0 19 56 20 10 17 0 13 78 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36 - 72 0 0 61 35 46 9 56 11 30 245 -13 61 42 8 61 29 24 62 15 9 60 56 42 - 71 0 0 61 35 36 9 56 7 30 246 -12 61 41 58 61 29 14 62 14 59 60 56 33 - 70 0 0 61 35 11 9 56 2 29 246 -12 61 41 34 61 28 50 62 14 34 60 56 8 - 69 0 0 61 34 31 9 55 58 29 247 -12 61 40 54 61 28 10 62 13 54 60 55 28 - 68 0 0 61 33 36 9 55 53 29 248 -11 61 39 58 61 27 14 62 12 59 60 54 32 - 67 0 0 61 32 25 9 55 49 28 249 -11 61 38 48 61 26 4 62 11 49 60 53 21 - 66 0 0 61 31 0 9 55 45 28 250 -10 61 37 22 61 24 38 62 10 24 60 51 55 - 65 0 0 61 29 18 9 55 41 27 251 -10 61 35 41 61 22 56 62 8 44 60 50 13 - 64 0 0 61 27 22 9 55 36 27 252 -9 61 33 45 61 20 59 62 6 49 60 48 15 - 63 0 0 61 25 10 9 55 32 26 253 -9 61 31 33 61 18 47 62 4 38 60 46 2 - 62 0 0 61 22 42 9 55 28 26 254 -8 61 29 6 61 16 19 62 2 12 60 43 33 - 61 0 0 61 19 59 9 55 24 26 255 -8 61 26 23 61 13 36 61 59 30 60 40 48 - 60 0 0 61 17 0 9 55 20 25 256 -7 61 23 24 61 10 37 61 56 33 60 37 47 - 59 0 0 61 13 46 9 55 16 25 257 -7 61 20 10 61 7 22 61 53 21 60 34 31 - 58 0 0 61 10 16 9 55 13 24 258 -6 61 16 40 61 3 52 61 49 53 60 30 59 - 57 0 0 61 6 30 9 55 9 24 259 -6 61 12 54 61 0 5 61 46 9 60 27 10 - 56 0 0 61 2 28 9 55 5 23 260 -5 61 8 53 60 56 3 61 42 10 60 23 6 - 55 0 0 60 58 9 9 55 1 23 261 -5 61 4 35 60 51 44 61 37 54 60 18 45 - 54 0 0 60 53 35 9 54 58 22 262 -4 61 0 1 60 47 9 61 33 23 60 14 8 - 53 0 0 60 48 45 9 54 54 22 263 -4 60 55 11 60 42 18 61 28 35 60 9 14 - 52 0 0 60 43 38 9 54 51 21 263 -3 60 50 5 60 37 11 61 23 32 60 4 4 - 51 0 0 60 38 14 9 54 47 21 264 -3 60 44 42 60 31 47 61 18 12 59 58 37 - 50 0 0 60 32 34 9 54 44 20 265 -2 60 39 2 60 26 6 61 12 35 59 52 54 - 49 0 0 60 26 37 9 54 40 20 266 -2 60 33 6 60 20 9 61 6 42 59 46 53 - 48 0 0 60 20 24 9 54 37 20 267 -1 60 26 53 60 13 55 61 0 33 59 40 36 - 47 0 0 60 13 53 9 54 34 19 268 -1 60 20 23 60 7 23 60 54 6 59 34 1 - 46 0 0 60 7 5 9 54 31 19 269 0 60 13 36 60 0 35 60 47 22 59 27 9 Uncertainty in time = +/- 7 secs Prediction of 2009 Oct 16.0 Data for the target star ------------------------ * name: TYC 1233-01012-1 * constellation : Aries * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 20 13.6395 DE: +15 24 51.468 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .047, .052 ) * V mag [mag]: 11.4 * B mag [mag]: 13.2 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (317) Roxane approx. diameter [km]: 19 approx. diameter ["]: .021 distance from Earth [AU]: 1.24700 * orbital information: orbit source: Preston date of fit: 2009 Oct 15 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 951 number of rejected observations: 148 time covered by the observations: 1901 Jun 07 - 2009 Sep 12 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.015, 75° remarks: * orbital elements for (317) Roxane : Mean anomaly = 53.80256946 deg Arg. of pericenter = 186.26966725 deg Long. of node = 151.43435093 deg Inclination = 1.76395914 deg Eccentricity = 0.08524795 Semimajor axis = 2.28617806 AU Perihelion dist = 2.09128607 AU Mag: H = 9.70, G = 0.15 Epoch of elements : MJD 55122.42000000 TDT (2009 Oct 18.420) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Oct 18 317 Roxane 10h 5.5m UT 11.4 3 20 13.640 15 24 51.47TYC 1233-01012-1 13.2 12.9 19 2.6 1.247 -1.853 -9.73 -128.3431 15.418 24.92 -9.74 10.0912 -0.20202 0.55613 -3.79510 -1.37830 -0.00246 -0.00039 2000 53.11256120091016.00000186.269667151.434351 1.7639590.08524795 2.2861781 2.091286110.0 5.00.15 RATE 2.8512740 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.054 0.054 359 3.58 0.054 0 55120.0020091018_1012-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2009 Oct 15, 17:15 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org