IOTA/IOTA-ES occultation update for (1568) Aisleen / TYC 0209-00607-1 event on 2009 Feb 04, 10:46 UT Visible from Summary ------- On 2009 Feb 04 UT, the 12 km diameter asteroid (1568) Aisleen will occult a 9.7 mag star in the constellation Cancer for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 5.7 mag to 15.4 mag (the magnitude of the asteroid) for at most 0.8 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: 11 * date and approx. time of event: 2009 Feb 04, 10:42 - 2009 Feb 04, 10:49 UT * magnitude of target star: 9.7 * magnitude drop [mag]: 5.7 * estimated maximum duration [s]: 0.8 * Moon: 67 % sunlit, 63° distance * Sun: 166° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 23 * 1 sigma uncertainty interval [path widths]: +/- 5.80 * 1 sigma uncertainty interval [seconds]: +/- 3.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .074 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .074", .034", 81° ) * approx speed of asteroid's shadow [km/s]: 15.5851 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 0209-00607-1 by 1568 Aisleen on 2009 Feb 4 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 151 3 40 -64 0 0 10 42 59 13 41 -1 151 18 38 150 48 37 154 7 40 147 48 30 151 47 59 -63 0 0 10 43 3 14 41 -2 152 2 15 151 33 39 154 43 35 148 42 32 152 24 58 -62 0 0 10 43 6 15 40 -3 152 38 37 152 11 16 155 13 11 149 27 57 152 55 31 -61 0 0 10 43 10 16 40 -3 153 8 37 152 42 22 155 37 11 150 5 54 153 20 23 -60 0 0 10 43 14 17 40 -4 153 33 0 153 7 44 155 56 12 150 37 20 153 40 11 -59 0 0 10 43 18 17 40 -5 153 52 22 153 27 58 156 10 45 151 2 58 153 55 26 -58 0 0 10 43 22 18 40 -6 154 7 13 153 43 37 156 21 15 151 23 26 154 6 33 -57 0 0 10 43 26 19 40 -7 154 17 59 153 55 5 156 28 6 151 39 14 154 13 55 -56 0 0 10 43 31 20 40 -7 154 25 1 154 2 46 156 31 34 151 50 50 154 17 49 -55 0 0 10 43 35 21 40 -8 154 28 39 154 6 58 156 31 57 151 58 34 154 18 33 -54 0 0 10 43 40 22 40 -9 154 29 7 154 7 58 156 29 28 152 2 46 154 16 20 -53 0 0 10 43 45 22 40 -9 154 26 39 154 5 59 156 24 19 152 3 42 154 11 22 -52 0 0 10 43 51 23 41 -10 154 21 28 154 1 14 156 16 41 152 1 35 154 3 49 -51 0 0 10 43 56 24 41 -11 154 13 43 153 53 53 156 6 41 151 56 38 153 53 49 -50 0 0 10 44 2 25 42 -11 154 3 32 153 44 4 155 54 28 151 49 0 153 41 30 -49 0 0 10 44 7 25 42 -12 153 51 4 153 31 56 155 40 8 151 38 50 153 27 0 -48 0 0 10 44 13 26 43 -13 153 36 24 153 17 34 155 23 47 151 26 15 153 10 22 -47 0 0 10 44 19 26 43 -13 153 19 38 153 1 4 155 5 29 151 11 23 152 51 43 -46 0 0 10 44 26 27 44 -14 153 0 51 152 42 32 154 45 19 150 54 17 152 31 5 -45 0 0 10 44 32 28 44 -14 152 40 7 152 22 1 154 23 21 150 35 3 152 8 32 -44 0 0 10 44 38 28 45 -15 152 17 28 151 59 33 153 59 36 150 13 44 151 44 6 -43 0 0 10 44 45 29 46 -15 151 52 57 151 35 13 153 34 6 149 50 23 151 17 49 -42 0 0 10 44 52 29 47 -15 151 26 37 151 9 1 153 6 55 149 25 3 150 49 44 -41 0 0 10 44 59 30 48 -16 150 58 27 150 40 59 152 38 1 148 57 44 150 19 49 -40 0 0 10 45 6 30 48 -16 150 28 29 150 11 7 152 7 28 148 28 28 149 48 6 -39 0 0 10 45 13 30 49 -16 149 56 44 149 39 27 151 35 13 147 57 15 149 14 34 -38 0 0 10 45 21 31 50 -17 149 23 10 149 5 57 151 1 17 147 24 4 148 39 12 -37 0 0 10 45 28 31 51 -17 148 47 47 148 30 36 150 25 40 146 48 54 148 1 59 -36 0 0 10 45 36 31 52 -17 148 10 34 147 53 23 149 48 19 146 11 45 147 22 53 -35 0 0 10 45 44 31 53 -17 147 31 27 147 14 16 149 9 13 145 32 32 146 41 50 -34 0 0 10 45 52 32 54 -17 146 50 25 146 33 12 148 28 19 144 51 13 145 58 47 -33 0 0 10 46 0 32 55 -17 146 7 24 145 50 8 147 45 35 144 7 45 145 13 40 -32 0 0 10 46 9 32 56 -18 145 22 20 145 4 59 147 0 56 143 22 1 144 26 25 -31 0 0 10 46 17 32 58 -18 144 35 8 144 17 40 146 14 18 142 33 57 143 36 54 -30 0 0 10 46 26 32 59 -17 143 45 41 143 28 4 145 25 36 141 43 24 142 45 0 -29 0 0 10 46 34 32 60 -17 142 53 53 142 36 5 144 34 43 140 50 14 141 50 35 -28 0 0 10 46 43 31 61 -17 141 59 35 141 41 34 143 41 33 139 54 17 140 53 29 -27 0 0 10 46 52 31 62 -17 141 2 36 140 44 20 142 45 56 138 55 20 139 53 29 -26 0 0 10 47 2 31 63 -17 140 2 46 139 44 10 141 47 43 137 53 9 138 50 21 -25 0 0 10 47 11 30 65 -16 138 59 49 138 40 51 140 46 42 136 47 24 137 43 48 -24 0 0 10 47 20 30 66 -16 137 53 28 137 34 5 139 42 37 135 37 44 136 33 27 -23 0 0 10 47 30 29 67 -15 136 43 23 136 23 28 138 35 13 134 23 42 135 18 53 -22 0 0 10 47 40 29 68 -15 135 29 8 135 8 35 137 24 9 133 4 41 133 59 32 -21 0 0 10 47 50 28 69 -14 134 10 9 133 48 52 136 8 58 131 39 58 132 34 43 -20 0 0 10 48 0 27 71 -13 132 45 46 132 23 35 134 49 10 130 8 31 131 3 29 -19 0 0 10 48 11 26 72 -12 131 15 6 130 51 47 133 24 4 128 28 59 129 24 36 -18 0 0 10 48 21 25 73 -11 129 36 54 129 12 11 131 52 48 126 39 25 127 36 17 -17 0 0 10 48 32 24 74 -10 127 49 29 127 22 56 130 14 12 124 36 47 125 35 54 -16 0 0 10 48 44 22 75 -9 125 50 19 125 21 17 128 26 39 122 16 4 Latitude Latitude Latitude Latitude 124 0 0 -15 17 2 10 48 52 21 76 -8 -15 10 20 -15 23 45 -13 54 17 -16 43 25 123 0 0 -14 52 15 10 48 57 20 77 -7 -14 45 38 -14 58 54 -13 30 18 -16 17 45 122 0 0 -14 29 4 10 49 1 19 77 -6 -14 22 30 -14 35 39 -13 7 50 -15 53 44 121 0 0 -14 7 26 10 49 6 18 78 -5 -14 0 56 -14 13 58 -12 46 53 -15 31 21 120 0 0 -13 47 21 10 49 10 18 78 -4 -13 40 53 -13 53 49 -12 27 24 -15 10 34 119 0 0 -13 28 46 10 49 14 17 78 -4 -13 22 21 -13 35 12 -12 9 22 -14 51 22 118 0 0 -13 11 41 10 49 18 16 79 -3 -13 5 19 -13 18 4 -11 52 47 -14 33 43 117 0 0 -12 56 5 10 49 21 15 79 -2 -12 49 45 -13 2 26 -11 37 38 -14 17 37 116 0 0 -12 41 56 10 49 25 14 79 -1 -12 35 38 -12 48 15 -11 23 53 -14 3 1 115 0 0 -12 29 15 10 49 28 13 80 0 -12 22 58 -12 35 32 -11 11 32 -13 49 56 Uncertainty in time = +/- 5 secs [Prediction of 2008 Nov 6.0] Data for the target star ------------------------ * name: TYC 0209-00607-1 * constellation : Cancer * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 08 27 35.1358 DE: +07 02 37.811 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .025, .024 ) * V mag [mag]: 9.7 * B mag [mag]: 10.4 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1568) Aisleen approx. diameter [km]: 12 approx. diameter ["]: .011 distance from Earth [AU]: 1.48900 * orbital information: orbit source: Preston date of fit: 2008 Nov 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 708 number of rejected observations: 27 time covered by the observations: 1946 Aug 21 - 2007 Sep 16 1 sigma uncertainty ellipse (major, minor, PA): 0.070, 0.024, 80° remarks: * orbital elements for (1568) Aisleen : Mean anomaly = 85.71733253 deg Arg. of pericenter = 228.76189349 deg Long. of node = 146.28122107 deg Inclination = 24.89875529 deg Eccentricity = 0.25403745 Semimajor axis = 2.35235512 AU Perihelion dist = 1.75476883 AU Mag: H = 11.57, G = 0.15 Epoch of elements : MJD 54866.44900000 TDT (2009 Feb 04.449) ------ occelmnt file for Occult BEGIN ----------------------------------- 2009 Feb 4 1568 Aisleen 10h 46.2m UT 9.7 8 27 35.136 7 2 37.81TYC 0209-00607-1 10.4 15.4 12 0.8 1.489 -2.416 37.48 -169.3912 7.032 21.94 -16.11 10.7702 -0.61279 -0.58818 -6.09097 6.34680 0.00111 0.00092 2000 83.9555922009 129.00000228.761893146.281221 24.8987550.25403745 2.3523551 1.754768812.1 5.00.15 RATE 2.7318050 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.074 0.034 81 6.80 0.064 0 54776.5020090204_0607-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Nov 06, 05:04 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org