IOTA/IOTA-ES occultation update for (155) Scylla / TYC 2366-00689-1 event on 2009 Feb 03, 02:38 UT Visible from Summary ------- On 2009 Feb 03 UT, the 40 km diameter asteroid (155) Scylla will occult a 10.5 mag star in the constellation Perseus for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 4.4 mag to 14.9 mag (the magnitude of the asteroid) for at most 4.3 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: 72 * date and approx. time of event: 2009 Feb 03, 02:34 - 2009 Feb 03, 02:49 UT * magnitude of target star: 10.5 * magnitude drop [mag]: 4.4 * estimated maximum duration [s]: 4.3 * Moon: 52 % sunlit, 21° distance * Sun: 112° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 41 * 1 sigma uncertainty interval [path widths]: +/- 0.80 * 1 sigma uncertainty interval [seconds]: +/- 4.4 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .048 +/- .033) * 1 sigma uncertainty ellipse (major, minor, PA): ( .051", .028", 67° ) * approx speed of asteroid's shadow [km/s]: 9.3573 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2366-00689-1 by 155 Scylla on 2009 Feb 3 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 -131 0 0 19 52 22 2 34 35 66 48 0 19 40 50 20 3 54 19 22 22 20 22 20 -130 0 0 20 9 33 2 34 47 67 47 -1 19 58 3 20 21 3 19 39 38 20 39 26 -129 0 0 20 26 5 2 34 58 68 47 -2 20 14 37 20 37 33 19 56 15 20 55 52 -128 0 0 20 41 59 2 35 9 69 46 -3 20 30 32 20 53 24 20 12 14 21 11 41 -127 0 0 20 57 13 2 35 21 70 45 -4 20 45 49 21 8 37 20 27 33 21 26 50 -126 0 0 21 11 49 2 35 32 71 44 -5 21 0 26 21 23 11 20 42 13 21 41 21 -125 0 0 21 25 46 2 35 44 71 42 -6 21 14 26 21 37 7 20 56 15 21 55 14 -124 0 0 21 39 5 2 35 55 72 41 -7 21 27 46 21 50 24 21 9 39 22 8 29 -123 0 0 21 51 46 2 36 7 73 39 -8 21 40 29 22 3 3 21 22 24 22 21 6 -122 0 0 22 3 49 2 36 18 74 38 -9 21 52 33 22 15 4 21 34 30 22 33 4 -121 0 0 22 15 13 2 36 30 74 36 -10 22 3 59 22 26 27 21 45 58 22 44 25 -120 0 0 22 26 0 2 36 42 75 33 -11 22 14 47 22 37 13 21 56 49 22 55 8 -119 0 0 22 36 9 2 36 53 76 31 -12 22 24 57 22 47 20 22 7 1 23 5 14 -118 0 0 22 45 40 2 37 5 76 28 -13 22 34 29 22 56 50 22 16 35 23 14 42 -117 0 0 22 54 34 2 37 16 77 25 -14 22 43 24 23 5 43 22 25 32 23 23 32 -116 0 0 23 2 50 2 37 28 77 22 -15 22 51 41 23 13 58 22 33 51 23 31 46 -115 0 0 23 10 29 2 37 39 78 18 -16 22 59 21 23 21 36 22 41 32 23 39 22 -114 0 0 23 17 30 2 37 51 78 15 -17 23 6 24 23 28 36 22 48 36 23 46 21 -113 0 0 23 23 55 2 38 2 79 10 -18 23 12 49 23 35 0 22 55 3 23 52 44 -112 0 0 23 29 42 2 38 14 79 6 -19 23 18 37 23 40 47 23 0 52 23 58 29 -111 0 0 23 34 53 2 38 25 79 2 -20 23 23 48 23 45 57 23 6 5 24 3 38 -110 0 0 23 39 26 2 38 37 79 357 -21 23 28 23 23 50 29 23 10 40 24 8 10 -109 0 0 23 43 23 2 38 48 79 352 -22 23 32 20 23 54 26 23 14 38 24 12 5 -108 0 0 23 46 43 2 38 59 79 348 -23 23 35 40 23 57 45 23 17 59 24 15 24 -107 0 0 23 49 26 2 39 11 79 343 -24 23 38 24 24 0 28 23 20 43 24 18 6 -106 0 0 23 51 33 2 39 22 78 339 -25 23 40 31 24 2 34 23 22 51 24 20 12 -105 0 0 23 53 3 2 39 34 78 335 -26 23 42 1 24 4 4 23 24 21 24 21 42 -104 0 0 23 53 56 2 39 45 78 332 -27 23 42 54 24 4 57 23 25 15 24 22 35 -103 0 0 23 54 13 2 39 56 77 328 -28 23 43 11 24 5 14 23 25 32 24 22 51 -102 0 0 23 53 53 2 40 8 77 325 -29 23 42 51 24 4 54 23 25 12 24 22 31 -101 0 0 23 52 57 2 40 19 76 322 -30 23 41 55 24 3 58 23 24 15 24 21 35 -100 0 0 23 51 24 2 40 30 76 320 -31 23 40 22 24 2 25 23 22 41 24 20 3 - 99 0 0 23 49 14 2 40 41 75 318 -31 23 38 12 24 0 16 23 20 31 24 17 54 - 98 0 0 23 46 28 2 40 53 74 316 -32 23 35 25 23 57 30 23 17 44 24 15 9 - 97 0 0 23 43 5 2 41 4 73 314 -33 23 32 2 23 54 8 23 14 20 24 11 47 - 96 0 0 23 39 6 2 41 15 73 312 -34 23 28 2 23 50 9 23 10 20 24 7 49 - 95 0 0 23 34 30 2 41 26 72 311 -35 23 23 26 23 45 34 23 5 42 24 3 15 - 94 0 0 23 29 17 2 41 37 71 310 -36 23 18 12 23 40 21 23 0 27 23 58 4 - 93 0 0 23 23 27 2 41 48 70 308 -37 23 12 22 23 34 33 22 54 36 23 52 16 - 92 0 0 23 17 1 2 41 59 70 308 -38 23 5 55 23 28 7 22 48 7 23 45 52 - 91 0 0 23 9 58 2 42 10 69 307 -39 22 58 50 23 21 4 22 41 2 23 38 51 - 90 0 0 23 2 17 2 42 21 68 306 -40 22 51 9 23 13 25 22 33 19 23 31 13 - 89 0 0 22 54 0 2 42 32 67 305 -41 22 42 50 23 5 9 22 24 59 23 22 58 - 88 0 0 22 45 5 2 42 43 66 305 -42 22 33 55 22 56 15 22 16 1 23 14 6 - 87 0 0 22 35 33 2 42 54 65 304 -43 22 24 22 22 46 45 22 6 26 23 4 38 - 86 0 0 22 25 24 2 43 4 64 304 -44 22 14 11 22 36 37 21 56 14 22 54 32 - 85 0 0 22 14 38 2 43 15 63 303 -45 22 3 23 22 25 51 21 45 23 22 43 49 - 84 0 0 22 3 14 2 43 26 63 303 -46 21 51 58 22 14 29 21 33 56 22 32 28 - 83 0 0 21 51 12 2 43 36 62 303 -47 21 39 55 22 2 29 21 21 50 22 20 31 - 82 0 0 21 38 32 2 43 47 61 302 -48 21 27 14 21 49 51 21 9 7 22 7 55 - 81 0 0 21 25 15 2 43 57 60 302 -49 21 13 55 21 36 35 20 55 45 21 54 42 - 80 0 0 21 11 20 2 44 8 59 302 -50 20 59 58 21 22 42 20 41 46 21 40 51 - 79 0 0 20 56 47 2 44 18 58 302 -51 20 45 23 21 8 10 20 27 8 21 26 23 - 78 0 0 20 41 36 2 44 28 57 302 -52 20 30 10 20 53 1 20 11 52 21 11 17 - 77 0 0 20 25 46 2 44 39 56 302 -53 20 14 19 20 37 14 19 55 58 20 55 32 - 76 0 0 20 9 19 2 44 49 55 302 -54 19 57 49 20 20 48 19 39 25 20 39 10 - 75 0 0 19 52 13 2 44 59 54 302 -55 19 40 41 20 3 44 19 22 14 20 22 9 - 74 0 0 19 34 29 2 45 9 53 302 -56 19 22 55 19 46 2 19 4 24 20 4 30 - 73 0 0 19 16 6 2 45 19 52 302 -56 19 4 30 19 27 41 18 45 56 19 46 13 - 72 0 0 18 57 5 2 45 28 51 302 -57 18 45 27 19 8 42 18 26 49 19 27 17 - 71 0 0 18 37 25 2 45 38 50 302 -58 18 25 45 18 49 5 18 7 3 19 7 43 - 70 0 0 18 17 7 2 45 48 49 302 -59 18 5 24 18 28 49 17 46 39 18 47 31 - 69 0 0 17 56 10 2 45 57 48 302 -60 17 44 25 18 7 54 17 25 36 18 26 40 - 68 0 0 17 34 34 2 46 7 47 302 -61 17 22 47 17 46 21 17 3 54 18 5 11 - 67 0 0 17 12 20 2 46 16 46 302 -62 17 0 31 17 24 9 16 41 34 17 43 3 - 66 0 0 16 49 28 2 46 25 45 302 -63 16 37 36 17 1 19 16 18 35 17 20 17 - 65 0 0 16 25 57 2 46 34 44 302 -64 16 14 2 16 37 51 15 54 58 16 56 53 - 64 0 0 16 1 48 2 46 43 43 302 -65 15 49 51 16 13 44 15 30 42 16 32 50 - 63 0 0 15 37 0 2 46 52 42 302 -66 15 25 1 15 49 0 15 5 48 16 8 9 - 62 0 0 15 11 35 2 47 0 41 303 -67 14 59 32 15 23 37 14 40 16 15 42 51 - 61 0 0 14 45 31 2 47 9 40 303 -68 14 33 26 14 57 36 14 14 5 15 16 54 - 60 0 0 14 18 50 2 47 17 38 303 -69 14 6 43 14 30 57 13 47 17 14 50 20 - 59 0 0 13 51 32 2 47 25 37 303 -70 13 39 21 14 3 41 13 19 52 14 23 8 - 58 0 0 13 23 36 2 47 34 36 303 -71 13 11 23 13 35 48 12 51 49 13 55 19 - 57 0 0 12 55 3 2 47 41 35 303 -72 12 42 47 13 7 18 12 23 9 13 26 53 - 56 0 0 12 25 54 2 47 49 34 303 -73 12 13 35 12 38 11 11 53 53 12 57 51 - 55 0 0 11 56 8 2 47 57 33 303 -73 11 43 47 12 8 29 11 24 0 12 28 12 - 54 0 0 11 25 47 2 48 4 32 303 -74 11 13 23 11 38 10 10 53 32 11 57 58 - 53 0 0 10 54 50 2 48 11 31 304 -75 10 42 23 11 7 16 10 22 28 11 27 8 - 52 0 0 10 23 18 2 48 18 30 304 -76 10 10 49 10 35 47 9 50 49 10 55 43 - 51 0 0 9 51 12 2 48 25 28 304 -76 9 38 40 10 3 43 9 18 36 10 23 44 - 50 0 0 9 18 32 2 48 31 27 304 -77 9 5 57 9 31 6 8 45 49 9 51 11 - 49 0 0 8 45 19 2 48 37 26 304 -77 8 32 42 8 57 56 8 12 29 9 18 5 - 48 0 0 8 11 34 2 48 44 25 304 -78 7 58 54 8 24 13 7 38 37 8 44 26 - 47 0 0 7 37 16 2 48 49 24 304 -78 7 24 34 7 49 58 7 4 13 8 10 16 - 46 0 0 7 2 28 2 48 55 23 304 -78 6 49 43 7 15 12 6 29 18 7 35 34 - 45 0 0 6 27 10 2 49 0 22 304 -78 6 14 22 6 39 56 5 53 53 7 0 22 - 44 0 0 5 51 22 2 49 5 20 304 -78 5 38 32 6 4 11 5 17 59 6 24 41 - 43 0 0 5 15 6 2 49 10 19 305 -78 5 2 13 5 27 57 4 41 37 5 48 31 - 42 0 0 4 38 22 2 49 15 18 305 -78 4 25 27 4 51 16 4 4 47 5 11 53 - 41 0 0 4 1 12 2 49 19 17 305 -77 3 48 15 4 14 8 3 27 31 4 34 49 - 40 0 0 3 23 36 2 49 23 16 305 -77 3 10 37 3 36 35 2 49 49 3 57 19 - 39 0 0 2 45 36 2 49 27 14 305 -76 2 32 35 2 58 37 2 11 44 3 19 25 - 38 0 0 2 7 13 2 49 30 13 305 -76 1 54 10 2 20 16 1 33 15 2 41 7 - 37 0 0 1 28 28 2 49 33 12 305 -75 1 15 22 1 41 33 0 54 25 2 2 27 - 36 0 0 0 49 22 2 49 36 11 305 -74 0 36 15 1 2 29 0 15 14 1 23 26 - 35 0 0 0 9 56 2 49 39 10 305 -73 - 0 3 13 0 23 5 - 0 24 17 0 44 5 - 34 0 0 - 0 29 48 2 49 41 8 305 -72 - 0 42 58 - 0 16 37 - 1 4 5 0 4 26 - 33 0 0 - 1 9 48 2 49 43 7 305 -71 - 1 23 1 - 0 56 36 - 1 44 10 - 0 35 31 - 32 0 0 - 1 50 5 2 49 45 6 305 -70 - 2 3 19 - 1 36 51 - 2 24 31 - 1 15 43 - 31 0 0 - 2 30 35 2 49 46 5 305 -69 - 2 43 51 - 2 17 20 - 3 5 5 - 1 56 10 - 30 0 0 - 3 11 19 2 49 47 4 305 -68 - 3 24 36 - 2 58 2 - 3 45 52 - 2 36 50 - 29 0 0 - 3 52 14 2 49 48 2 305 -67 - 4 5 32 - 3 38 56 - 4 26 50 - 3 17 41 - 28 0 0 - 4 33 18 2 49 48 1 305 -66 - 4 46 38 - 4 20 0 - 5 7 58 - 3 58 43 Uncertainty in time = +/- 6 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: TYC 2366-00689-1 * constellation : Perseus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 04 08 54.5470 DE: +34 16 06.885 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .018 ) * V mag [mag]: 10.5 * B mag [mag]: 11.1 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (155) Scylla approx. diameter [km]: 40 approx. diameter ["]: .039 distance from Earth [AU]: 1.40800 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 633 number of rejected observations: 26 time covered by the observations: 1907 Nov 02 - 2008 Oct 16 1 sigma uncertainty ellipse (major, minor, PA): 0.048, 0.022, 64° remarks: * orbital elements for (155) Scylla : Mean anomaly = 4.19165789 deg Arg. of pericenter = 46.04249103 deg Long. of node = 41.04386221 deg Inclination = 11.39004755 deg Eccentricity = 0.27700290 Semimajor axis = 2.75710827 AU Perihelion dist = 1.99338128 AU Mag: H = 11.05, G = 0.15 Epoch of elements : MJD 54865.11000000 TDT (2009 Feb 03.110) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 3 155 Scylla 2h 38.6m UT 10.5 4 8 54.547 34 16 6.89TYC 2366-00689-1 11.1 14.9 40 4.3 1.408 2.653 2.60 -110.8480 34.268 143.80 -16.51 2.6440 0.01360 -0.18669 5.26515 0.41569 0.00505 0.00050 2000 3.0915272009 129.00000 46.042491 41.043862 11.3900480.27700290 2.7571083 1.993381311.4 5.00.15 RATE 2.1528980 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.051 0.028 67 1.80 0.031 0 54776.5020090203_0689-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 04:51 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org