IOTA/IOTA-ES occultation update for (729) Watsonia / TYC 1909-00373-1 event on 2008 Mar 05, 04:43 UT Visible from W Canada,W USA,W Mexico Summary ------- On 2008 Mar 05 UT, the 49 km diameter asteroid (729) Watsonia will occult a 11.7 mag star in the constellation Gemini for observers along a path across W Canada,W USA,W Mexico. In the case of an occultation, the combined light of the asteroid and the star will drop by 2.5 mag to 14.0 mag (the magnitude of the asteroid) for at most 8.9 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: 64 * date and approx. time of event: 2008 Mar 05, 04:24 - 2008 Mar 05, 05:01 UT * magnitude of target star: 11.7 * magnitude drop [mag]: 2.5 * estimated maximum duration [s]: 8.9 * Moon: 7 % sunlit, 154° distance * Sun: 123° distance * rough path description: W Canada,W USA,W Mexico The occultation path -------------------- * approximate projected width [km]: 50 * 1 sigma uncertainty interval [path widths]: +/- 0.94 * 1 sigma uncertainty interval [seconds]: +/- 5.8 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .022) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .021", 82° ) * approx speed of asteroid's shadow [km/s]: 5.5547 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 1909-00373-1 by 729 Watsonia on 2008 Mar 5 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 - 98 59 7 -65 0 0 4 24 8 1 340 -14 - 98 25 45 - 99 32 21 - 97 22 41 -100 34 31 - 99 46 55 -64 0 0 4 24 9 2 341 -15 - 99 14 56 -100 18 48 - 98 14 29 -101 18 27 -100 30 55 -63 0 0 4 24 10 3 342 -16 -100 0 10 -101 1 34 - 99 2 6 -101 58 56 -101 11 33 -62 0 0 4 24 11 4 342 -16 -100 41 57 -101 41 4 - 99 46 3 -102 36 21 -101 49 13 -61 0 0 4 24 13 5 343 -17 -101 20 39 -102 17 42 -100 26 44 -103 11 3 -102 24 13 -60 0 0 4 24 15 6 343 -17 -101 56 37 -102 51 45 -101 4 32 -103 43 20 -102 56 51 -59 0 0 4 24 17 7 344 -18 -102 30 8 -103 23 30 -101 39 44 -104 13 28 -103 27 21 -58 0 0 4 24 20 8 344 -18 -103 1 27 -103 53 12 -102 12 36 -104 41 38 -103 55 56 -57 0 0 4 24 23 9 345 -19 -103 30 48 -104 21 2 -102 43 24 -105 8 4 -104 22 47 -56 0 0 4 24 27 10 345 -20 -103 58 21 -104 47 10 -103 12 17 -105 32 54 -104 48 4 -55 0 0 4 24 31 11 345 -20 -104 24 17 -105 11 47 -103 39 28 -105 56 18 -105 11 54 -54 0 0 4 24 35 12 346 -21 -104 48 45 -105 35 1 -104 5 6 -106 18 23 -105 34 27 -53 0 0 4 24 40 13 346 -21 -105 11 52 -105 56 59 -104 29 18 -106 39 17 -105 55 47 -52 0 0 4 24 44 14 346 -22 -105 33 45 -106 17 48 -104 52 13 -106 59 5 -106 16 2 -51 0 0 4 24 50 15 346 -22 -105 54 30 -106 37 33 -105 13 56 -107 17 53 -106 35 17 -50 0 0 4 24 55 17 347 -23 -106 14 14 -106 56 19 -105 34 34 -107 35 46 -106 53 37 -49 0 0 4 25 1 18 347 -23 -106 33 0 -107 14 12 -105 54 11 -107 52 49 -107 11 5 -48 0 0 4 25 8 19 347 -24 -106 50 54 -107 31 15 -106 12 53 -108 9 4 -107 27 46 -47 0 0 4 25 14 20 347 -24 -107 7 59 -107 47 32 -106 30 43 -108 24 37 -107 43 43 -46 0 0 4 25 21 21 347 -25 -107 24 19 -108 3 7 -106 47 46 -108 39 30 -107 59 0 -45 0 0 4 25 29 22 348 -25 -107 39 57 -108 18 2 -107 4 5 -108 53 45 -108 13 40 -44 0 0 4 25 36 23 348 -26 -107 54 57 -108 32 21 -107 19 43 -109 7 27 -108 27 44 -43 0 0 4 25 44 24 348 -26 -108 9 20 -108 46 6 -107 34 42 -109 20 36 -108 41 15 -42 0 0 4 25 53 25 348 -27 -108 23 10 -108 59 20 -107 49 6 -109 33 15 -108 54 16 -41 0 0 4 26 1 26 348 -27 -108 36 28 -109 12 4 -108 2 57 -109 45 27 -109 6 49 -40 0 0 4 26 10 27 348 -28 -108 49 17 -109 24 20 -108 16 17 -109 57 13 -109 18 55 -39 0 0 4 26 19 28 348 -28 -109 1 39 -109 36 10 -108 29 8 -110 8 34 -109 30 36 -38 0 0 4 26 29 29 348 -29 -109 13 35 -109 47 37 -108 41 32 -110 19 33 -109 41 54 -37 0 0 4 26 39 30 348 -29 -109 25 6 -109 58 41 -108 53 30 -110 30 11 -109 52 50 -36 0 0 4 26 49 31 348 -30 -109 36 15 -110 9 23 -109 5 4 -110 40 28 -110 3 24 -35 0 0 4 26 59 32 348 -30 -109 47 3 -110 19 45 -109 16 15 -110 50 27 -110 13 40 -34 0 0 4 27 10 33 348 -31 -109 57 30 -110 29 49 -109 27 5 -111 0 8 -110 23 37 -33 0 0 4 27 21 34 348 -31 -110 7 39 -110 39 34 -109 37 35 -111 9 32 -110 33 16 -32 0 0 4 27 33 35 348 -32 -110 17 29 -110 49 3 -109 47 46 -111 18 40 -110 42 39 -31 0 0 4 27 44 36 348 -32 -110 27 2 -110 58 15 -109 57 39 -111 27 34 -110 51 46 -30 0 0 4 27 56 37 348 -33 -110 36 19 -111 7 13 -110 7 14 -111 36 13 -111 0 39 -29 0 0 4 28 8 38 348 -33 -110 45 21 -111 15 56 -110 16 34 -111 44 38 -111 9 17 -28 0 0 4 28 21 39 348 -33 -110 54 8 -111 24 25 -110 25 37 -111 52 51 -111 17 41 -27 0 0 4 28 34 40 348 -34 -111 2 41 -111 32 41 -110 34 26 -112 0 52 -111 25 53 -26 0 0 4 28 47 41 348 -34 -111 11 1 -111 40 45 -110 43 1 -112 8 41 -111 33 53 -25 0 0 4 29 0 42 348 -35 -111 19 8 -111 48 37 -110 51 22 -112 16 19 -111 41 40 -24 0 0 4 29 13 43 348 -35 -111 27 2 -111 56 18 -110 59 30 -112 23 46 -111 49 17 -23 0 0 4 29 27 44 348 -36 -111 34 46 -112 3 47 -111 7 26 -112 31 3 -111 56 42 -22 0 0 4 29 41 45 347 -36 -111 42 17 -112 11 6 -111 15 10 -112 38 10 -112 3 57 -21 0 0 4 29 56 45 347 -36 -111 49 38 -112 18 15 -111 22 42 -112 45 7 -112 11 2 -20 0 0 4 30 10 46 347 -37 -111 56 49 -112 25 14 -111 30 4 -112 51 56 -112 17 57 -19 0 0 4 30 25 47 347 -37 -112 3 49 -112 32 4 -111 37 14 -112 58 36 -112 24 42 -18 0 0 4 30 40 48 347 -37 -112 10 39 -112 38 44 -111 44 14 -113 5 7 -112 31 18 -17 0 0 4 30 55 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18 11 78 2 10 3 0 0 76 57 44 5 1 16 13 315 -9 76 39 22 77 16 5 76 4 47 77 50 30 4 0 0 76 44 32 5 1 18 13 316 -9 76 25 51 77 3 12 75 50 39 77 38 14 5 0 0 76 30 37 5 1 19 13 317 -9 76 11 35 76 49 37 75 35 45 77 25 17 6 0 0 76 15 56 5 1 21 12 318 -8 75 56 33 76 35 18 75 20 2 77 11 38 7 0 0 76 0 27 5 1 22 12 319 -8 75 40 40 76 20 11 75 3 26 76 57 14 8 0 0 75 44 4 5 1 24 12 320 -8 75 23 54 76 4 13 74 45 54 76 42 1 9 0 0 75 26 46 5 1 25 11 321 -8 75 6 10 75 47 20 74 27 21 76 25 55 10 0 0 75 8 27 5 1 27 11 322 -8 74 47 24 75 29 28 74 7 44 76 8 54 11 0 0 74 49 2 5 1 29 11 323 -7 74 27 30 75 10 32 73 46 56 75 50 52 12 0 0 74 28 28 5 1 30 10 324 -7 74 6 25 74 50 28 73 24 52 75 31 45 13 0 0 74 6 36 5 1 32 10 325 -7 73 44 1 74 29 9 73 1 27 75 11 27 14 0 0 73 43 23 5 1 33 9 326 -7 73 20 13 74 6 30 72 36 32 74 49 52 15 0 0 73 18 39 5 1 35 9 327 -6 72 54 51 73 42 23 72 10 1 74 26 55 16 0 0 72 52 17 5 1 37 8 328 -6 72 27 50 73 16 41 71 41 44 74 2 26 17 0 0 72 24 7 5 1 38 8 329 -6 71 58 58 72 49 14 71 11 31 73 36 18 18 0 0 71 54 0 5 1 40 7 330 -5 71 28 5 72 19 52 70 39 11 73 8 21 19 0 0 71 21 43 5 1 41 6 331 -5 70 54 59 71 48 24 70 4 32 72 38 25 20 0 0 70 47 3 5 1 43 6 332 -5 70 19 26 71 14 37 69 27 18 72 6 16 21 0 0 70 9 45 5 1 44 5 333 -4 69 41 10 70 38 16 68 47 13 71 31 41 22 0 0 69 29 31 5 1 45 4 334 -4 68 59 53 69 59 3 68 3 59 70 54 24 23 0 0 68 46 0 5 1 46 3 335 -3 68 15 15 69 16 40 67 17 11 70 14 5 24 0 0 67 58 48 5 1 47 3 336 -3 67 26 49 68 30 41 66 26 26 69 30 23 25 0 0 67 7 28 5 1 48 2 337 -2 66 34 9 67 40 42 65 31 13 68 42 52 26 0 0 66 11 28 5 1 49 1 338 -2 65 36 40 66 46 9 .. .. .. 67 51 3 Uncertainty in time = +/- 8 secs [Prediction of 2008 Feb 27.0] Data for the target star ------------------------ * name: TYC 1909-00373-1 * constellation : Gemini * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 07 16 06.7002 DE: +22 38 02.748 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .017 ) * V mag [mag]: 11.7 * B mag [mag]: 12.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (729) Watsonia approx. diameter [km]: 49 approx. diameter ["]: .033 distance from Earth [AU]: 2.04600 * orbital information: orbit source: Preston date of fit: 2008 Feb 27 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 641 number of rejected observations: 50 time covered by the observations: 1917 Apr 22 - 2008 Jan 31 1 sigma uncertainty ellipse (major, minor, PA): 0.024, 0.013, 77° remarks: * orbital elements for (729) Watsonia : Mean anomaly = 285.76266361 deg Arg. of pericenter = 85.83112960 deg Long. of node = 124.64998295 deg Inclination = 18.06149911 deg Eccentricity = 0.09493234 Semimajor axis = 2.76037685 AU Perihelion dist = 2.49832780 AU Mag: H = 9.27, G = 0.15 Epoch of elements : MJD 54530.19700000 TDT (2008 Mar 05.197) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 5 729 Watsonia 4h 43.0m UT 11.7 7 16 6.700 22 38 2.75TYC 1909-00373-1 12.7 14.0 49 8.9 2.046 0.008 13.47 -125.0238 22.630 112.13 -5.91 4.7163 0.15967 -0.00090 0.02226 3.13514 0.00487 -0.00066 2000 285.7203272008 3 5.00000 85.831130124.649983 18.0614990.09493234 2.7603769 2.4983278 9.3 5.00.15 RATE 2.1490750 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.031 0.021 82 1.94 0.031 0 54523.5020080305_0373-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 27, 19:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org