IOTA/IOTA-ES occultation update for (1306) Scythia / TYC 2339-01646-1 event on 2009 Aug 06, 09:22 UT Visible from Summary ------- On 2009 Aug 06 UT, the 67 km diameter asteroid (1306) Scythia will occult a 11.8 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 3.5 mag to 15.3 mag (the magnitude of the asteroid) for at most 3.1 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: 69 * date and approx. time of event: 2009 Aug 06, 09:17 - 2009 Aug 06, 09:21 UT * magnitude of target star: 11.8 * magnitude drop [mag]: 3.5 * estimated maximum duration [s]: 3.1 * Moon: 100 % sunlit, 94° distance * Sun: 81° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 93 * 1 sigma uncertainty interval [path widths]: +/- 0.85 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .044 +/- .025) * 1 sigma uncertainty ellipse (major, minor, PA): ( .044", .025", 88° ) * approx speed of asteroid's shadow [km/s]: 21.6104 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2339-01646-1 by 1306 Scythia on 2009 Aug 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 ' " Longitude Longitude Longitude Longitude -147 52 52 17 0 0 9 17 40 0 57 -55 -147 5 10 ... .. .. ... .. .. ... .. .. -146 20 29 18 0 0 9 17 40 2 58 -54 -145 34 3 -147 7 40 ... .. .. -148 29 44 Latitude Latitude Latitude Latitude -146 0 0 18 13 39 9 17 40 3 58 -54 17 42 40 18 44 59 .. .. .. 19 39 3 -145 0 0 18 54 22 9 17 41 4 58 -54 18 23 4 19 26 2 .. .. .. 20 20 42 -144 0 0 19 36 11 9 17 41 5 58 -53 19 4 33 20 8 12 .. .. .. 21 3 28 -143 0 0 20 19 6 9 17 42 6 59 -53 19 47 6 20 51 28 18 53 32 21 47 22 -142 0 0 21 3 6 9 17 43 7 59 -52 20 30 45 21 35 50 19 36 35 22 32 24 -141 0 0 21 48 11 9 17 44 8 59 -52 21 15 28 22 21 18 20 20 42 23 18 34 -140 0 0 22 34 21 9 17 46 10 60 -51 22 1 15 23 7 52 21 5 52 24 5 51 -139 0 0 23 21 37 9 17 47 11 60 -50 22 48 7 23 55 32 21 52 5 24 54 15 -138 0 0 24 9 57 9 17 49 12 61 -49 23 36 2 24 44 18 22 39 21 25 43 46 -137 0 0 24 59 20 9 17 51 13 61 -48 24 25 0 25 34 8 23 27 38 26 34 23 -136 0 0 25 49 47 9 17 53 14 62 -48 25 15 1 26 25 2 24 16 57 27 26 6 -135 0 0 26 41 17 9 17 56 16 62 -47 26 6 4 27 17 0 25 7 16 28 18 55 -134 0 0 27 33 48 9 17 58 17 63 -46 26 58 8 28 10 0 25 58 35 29 12 47 -133 0 0 28 27 20 9 18 1 18 63 -45 27 51 11 29 4 2 26 50 53 30 7 43 -132 0 0 29 21 51 9 18 4 19 64 -44 28 45 13 29 59 4 27 44 7 31 3 40 -131 0 0 30 17 21 9 18 7 20 65 -43 29 40 12 30 55 4 28 38 18 32 0 38 -130 0 0 31 13 46 9 18 10 22 65 -42 30 36 6 31 52 3 29 33 23 32 58 36 -129 0 0 32 11 7 9 18 14 23 66 -41 31 32 55 32 49 56 30 29 20 33 57 30 -128 0 0 33 9 20 9 18 17 24 67 -39 32 30 35 33 48 43 31 26 9 34 57 20 -127 0 0 34 8 23 9 18 21 25 68 -38 33 29 5 34 48 22 32 23 46 35 58 2 -126 0 0 35 8 14 9 18 25 26 69 -37 34 28 23 35 48 49 33 22 9 36 59 35 -125 0 0 36 8 51 9 18 30 27 69 -36 35 28 24 36 50 2 34 21 15 38 1 55 -124 0 0 37 10 10 9 18 34 29 70 -35 36 29 8 37 51 59 35 21 3 39 5 0 -123 0 0 38 12 8 9 18 39 30 71 -33 37 30 30 38 54 35 36 21 28 40 8 47 -122 0 0 39 14 41 9 18 43 31 73 -32 38 32 27 39 57 47 37 22 27 41 13 10 -121 0 0 40 17 47 9 18 48 32 74 -31 39 34 56 41 1 32 38 23 58 42 18 8 -120 0 0 41 21 20 9 18 53 33 75 -30 40 37 52 42 5 45 39 25 55 43 23 34 -119 0 0 42 25 17 9 18 58 34 76 -28 41 41 11 43 10 21 40 28 16 44 29 26 -118 0 0 43 29 33 9 19 4 35 77 -27 42 44 49 44 15 17 41 30 55 45 35 37 -117 0 0 44 34 3 9 19 9 36 79 -26 43 48 42 45 20 28 42 33 49 46 42 2 -116 0 0 45 38 42 9 19 15 37 80 -25 44 52 44 46 25 47 43 36 52 47 48 37 -115 0 0 46 43 25 9 19 20 37 82 -23 45 56 49 47 31 10 44 40 0 48 55 15 -114 0 0 47 48 6 9 19 26 38 83 -22 47 0 54 48 36 30 45 43 7 50 1 50 -113 0 0 48 52 40 9 19 32 39 85 -21 48 4 51 49 41 43 46 46 9 51 8 16 -112 0 0 49 57 0 9 19 37 40 86 -20 49 8 36 50 46 41 47 49 0 52 14 27 -111 0 0 51 1 1 9 19 43 41 88 -18 50 12 3 51 51 19 48 51 34 53 20 14 -110 0 0 52 4 36 9 19 49 41 90 -17 51 15 5 52 55 29 49 53 46 54 25 33 -109 0 0 53 7 40 9 19 55 42 91 -16 52 17 38 53 59 7 50 55 31 55 30 15 -108 0 0 54 10 5 9 20 1 42 93 -15 53 19 34 55 2 4 51 56 42 56 34 15 -107 0 0 55 11 47 9 20 7 43 95 -14 54 20 48 56 4 16 52 57 14 57 37 24 -106 0 0 56 12 39 9 20 12 43 97 -12 55 21 15 57 5 35 53 57 2 58 39 37 -105 0 0 57 12 35 9 20 18 44 99 -11 56 20 48 58 5 56 54 56 0 59 40 46 -104 0 0 58 11 30 9 20 24 44 101 -10 57 19 23 59 5 13 55 54 4 60 40 46 -103 0 0 59 9 18 9 20 29 44 102 -9 58 16 54 60 3 20 56 51 9 61 39 30 -102 0 0 60 5 55 9 20 35 45 104 -8 59 13 16 61 0 13 57 47 10 62 36 53 -101 0 0 61 1 15 9 20 40 45 106 -7 60 8 26 61 55 46 58 42 2 63 32 49 -100 0 0 61 55 16 9 20 45 45 108 -6 61 2 18 62 49 55 59 35 43 64 27 15 - 99 0 0 62 47 53 9 20 50 45 110 -5 61 54 50 63 42 37 60 28 8 65 20 7 - 98 0 0 63 39 2 9 20 55 45 112 -4 62 45 59 64 33 48 61 19 15 66 11 20 - 97 0 0 64 28 43 9 21 0 46 114 -3 63 35 42 65 23 26 62 9 1 67 0 53 - 96 0 0 65 16 51 9 21 5 46 116 -2 64 23 56 66 11 28 62 57 24 67 48 44 - 95 0 0 66 3 27 9 21 9 46 118 -1 65 10 41 66 57 54 63 44 22 68 34 50 - 94 0 0 66 48 29 9 21 14 46 119 0 65 55 55 67 42 42 64 29 55 69 19 13 Uncertainty in time = +/- 4 secs [Prediction of 2008 Mar 20.0] Data for the target star ------------------------ * name: TYC 2339-01646-1 * constellation : Perseus * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 03 06 27.2216 DE: +31 28 36.768 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .034, .023 ) * V mag [mag]: 11.8 * B mag [mag]: 12.7 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1306) Scythia approx. diameter [km]: 67 approx. diameter ["]: .033 distance from Earth [AU]: 2.83600 * orbital information: orbit source: Preston date of fit: 2008 Mar 20 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 635 number of rejected observations: 31 time covered by the observations: 1930 Jul 29 - 2007 Sep 07 1 sigma uncertainty ellipse (major, minor, PA): 0.027, 0.011, 86° remarks: * orbital elements for (1306) Scythia : Mean anomaly = 343.06953413 deg Arg. of pericenter = 137.15411992 deg Long. of node = 274.41780351 deg Inclination = 14.94101318 deg Eccentricity = 0.09461539 Semimajor axis = 3.14346471 AU Perihelion dist = 2.84604456 AU Mag: H = 9.47, G = 0.15 Epoch of elements : MJD 55049.39000000 TDT (2009 Aug 06.390) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Aug 6 1306 Scythia 9h 21.2m UT 11.8 3 6 27.222 31 28 36.77TYC 2339-01646-1 12.7 15.3 67 3.1 2.836 2.692 15.63 -48.7370 31.473 41.18 16.61 9.3534 -0.28607 0.63346 11.10746 5.04023 -0.00533 -0.00135 2000 341.4089662009 728.00000137.154120274.417804 14.9410130.09461539 3.1434647 2.8460446 9.7 5.00.15 RATE 1.7684430 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.044 0.025 88 1.85 0.028 0 54545.5020090806_1646-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Mar 20, 11:47 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org