IOTA/IOTA-ES occultation update for (1556) Wingolfia / TYC 6308-00226-1 event on 2008 Mar 24, 19:19 UT Visible from N Australia, Indonesia Summary ------- On 2008 Mar 24 UT, the 29 km diameter asteroid (1556) Wingolfia will occult a 10.0 mag star in the constellation Sagittarius for observers along a path across N Australia, Indonesia. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.8 mag to 16.8 mag (the magnitude of the asteroid) for at most 1.2 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: 21 * date and approx. time of event: 2008 Mar 24, 19:15 - 2008 Mar 24, 19:18 UT * midpoint of event [JD]: 2454550.30525417 * magnitude of target star: 10.0 * magnitude drop [mag]: 6.8 * estimated maximum duration [s]: 1.2 * Moon: 91 % sunlit, 69° distance * Sun: 76° distance * rough path description: N Australia, Indonesia The occultation path -------------------- * approximate projected width [km]: 29 * 1 sigma uncertainty interval [path widths]: +/- 3.13 * 1 sigma uncertainty interval [seconds]: +/- 3.9 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .039 +/- .035) * 1 sigma uncertainty ellipse (major, minor, PA): ( .039", .034", 97° ) * approx speed of asteroid's shadow [km/s]: 23.3246 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6308-00226-1 by 1556 Wingolfia on 2008 Mar 24 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 89 0 0 1 28 5 19 15 0 0 112 -73 1 19 35 1 36 35 0 26 21 .. .. .. 90 0 0 1 3 29 19 15 0 1 112 -73 0 54 59 1 11 59 0 1 44 2 5 12 91 0 0 0 38 49 19 15 1 2 112 -72 0 30 19 0 47 19 - 0 22 57 1 40 33 92 0 0 0 14 5 19 15 1 3 112 -71 0 5 35 0 22 36 - 0 47 42 1 15 50 93 0 0 - 0 10 42 19 15 1 5 112 -70 - 0 19 12 - 0 2 11 - 1 12 30 0 51 5 94 0 0 - 0 35 31 19 15 2 6 112 -69 - 0 44 1 - 0 27 0 - 1 37 20 0 26 16 95 0 0 - 1 0 22 19 15 2 7 112 -68 - 1 8 52 - 0 51 51 - 2 2 12 0 1 26 96 0 0 - 1 25 14 19 15 3 8 112 -67 - 1 33 45 - 1 16 43 - 2 27 4 - 0 23 26 97 0 0 - 1 50 7 19 15 4 9 112 -66 - 1 58 37 - 1 41 36 - 2 51 57 - 0 48 18 98 0 0 - 2 14 59 19 15 4 10 112 -65 - 2 23 30 - 2 6 28 - 3 16 50 - 1 13 11 99 0 0 - 2 39 51 19 15 5 11 112 -64 - 2 48 22 - 2 31 21 - 3 41 42 - 1 38 4 100 0 0 - 3 4 42 19 15 6 12 112 -63 - 3 13 13 - 2 56 11 - 4 6 32 - 2 2 55 101 0 0 - 3 29 31 19 15 8 13 112 -62 - 3 38 2 - 3 21 1 - 4 31 21 - 2 27 44 102 0 0 - 3 54 18 19 15 9 14 112 -61 - 4 2 48 - 3 45 47 - 4 56 6 - 2 52 32 103 0 0 - 4 19 1 19 15 10 15 112 -60 - 4 27 32 - 4 10 31 - 5 20 49 - 3 17 16 104 0 0 - 4 43 41 19 15 12 16 112 -59 - 4 52 11 - 4 35 10 - 5 45 27 - 3 41 57 105 0 0 - 5 8 16 19 15 13 18 112 -58 - 5 16 46 - 4 59 46 - 6 10 1 - 4 6 33 106 0 0 - 5 32 46 19 15 15 19 112 -57 - 5 41 16 - 5 24 17 - 6 34 30 - 4 31 5 107 0 0 - 5 57 11 19 15 16 20 111 -56 - 6 5 41 - 5 48 42 - 6 58 53 - 4 55 32 108 0 0 - 6 21 30 19 15 18 21 111 -55 - 6 30 0 - 6 13 1 - 7 23 10 - 5 19 53 109 0 0 - 6 45 42 19 15 20 22 111 -53 - 6 54 11 - 6 37 13 - 7 47 20 - 5 44 7 110 0 0 - 7 9 47 19 15 22 23 111 -52 - 7 18 16 - 7 1 18 - 8 11 22 - 6 8 14 111 0 0 - 7 33 44 19 15 24 24 111 -51 - 7 42 12 - 7 25 15 - 8 35 16 - 6 32 13 112 0 0 - 7 57 32 19 15 26 25 111 -50 - 8 6 0 - 7 49 4 - 8 59 2 - 6 56 4 113 0 0 - 8 21 12 19 15 28 26 111 -49 - 8 29 39 - 8 12 44 - 9 22 39 - 7 19 47 114 0 0 - 8 44 42 19 15 31 27 110 -48 - 8 53 9 - 8 36 14 - 9 46 6 - 7 43 20 115 0 0 - 9 8 1 19 15 33 28 110 -47 - 9 16 28 - 8 59 35 -10 9 22 - 8 6 43 116 0 0 - 9 31 11 19 15 36 29 110 -46 - 9 39 37 - 9 22 44 -10 32 28 - 8 29 55 117 0 0 - 9 54 9 19 15 38 30 110 -45 -10 2 35 - 9 45 43 -10 55 23 - 8 52 57 118 0 0 -10 16 55 19 15 41 32 110 -44 -10 25 21 -10 8 30 -11 18 6 - 9 15 47 119 0 0 -10 39 30 19 15 43 33 110 -43 -10 47 55 -10 31 5 -11 40 36 - 9 38 25 120 0 0 -11 1 52 19 15 46 34 109 -42 -11 10 16 -10 53 27 -12 2 54 -10 0 51 121 0 0 -11 24 0 19 15 49 35 109 -41 -11 32 24 -11 15 36 -12 24 59 -10 23 3 122 0 0 -11 45 55 19 15 52 36 109 -40 -11 54 19 -11 37 32 -12 46 50 -10 45 3 123 0 0 -12 7 37 19 15 55 37 109 -39 -12 15 59 -11 59 14 -13 8 27 -11 6 48 124 0 0 -12 29 3 19 15 58 38 108 -38 -12 37 25 -12 20 41 -13 29 49 -11 28 19 125 0 0 -12 50 15 19 16 1 39 108 -37 -12 58 37 -12 41 54 -13 50 57 -11 49 35 126 0 0 -13 11 12 19 16 4 40 108 -36 -13 19 33 -13 2 51 -14 11 49 -12 10 37 127 0 0 -13 31 53 19 16 7 41 108 -35 -13 40 13 -13 23 33 -14 32 25 -12 31 22 128 0 0 -13 52 18 19 16 11 42 107 -34 -14 0 37 -13 43 58 -14 52 45 -12 51 52 129 0 0 -14 12 26 19 16 14 43 107 -33 -14 20 45 -14 4 7 -15 12 49 -13 12 5 130 0 0 -14 32 18 19 16 18 44 107 -32 -14 40 36 -14 24 0 -15 32 36 -13 32 2 131 0 0 -14 51 53 19 16 21 45 107 -31 -15 0 10 -14 43 35 -15 52 6 -13 51 42 132 0 0 -15 11 10 19 16 25 46 106 -30 -15 19 27 -15 2 53 -16 11 18 -14 11 4 133 0 0 -15 30 9 19 16 28 47 106 -29 -15 38 26 -15 21 53 -16 30 12 -14 30 8 134 0 0 -15 48 51 19 16 32 48 106 -28 -15 57 6 -15 40 35 -16 48 49 -14 48 55 135 0 0 -16 7 14 19 16 35 49 105 -27 -16 15 29 -15 58 59 -17 7 7 -15 7 23 136 0 0 -16 25 18 19 16 39 50 105 -26 -16 33 32 -16 17 4 -17 25 6 -15 25 33 137 0 0 -16 43 4 19 16 43 51 105 -25 -16 51 17 -16 34 51 -17 42 46 -15 43 23 138 0 0 -17 0 30 19 16 47 52 104 -24 -17 8 43 -16 52 18 -18 0 8 -16 0 55 139 0 0 -17 17 37 19 16 51 53 104 -23 -17 25 49 -17 9 26 -18 17 10 -16 18 7 140 0 0 -17 34 25 19 16 54 54 104 -22 -17 42 36 -17 26 14 -18 33 52 -16 35 0 141 0 0 -17 50 52 19 16 58 55 103 -21 -17 59 3 -17 42 42 -18 50 14 -16 51 32 142 0 0 -18 7 0 19 17 2 56 103 -20 -18 15 10 -17 58 50 -19 6 17 -17 7 45 143 0 0 -18 22 47 19 17 6 57 103 -19 -18 30 56 -18 14 38 -19 21 59 -17 23 37 144 0 0 -18 38 14 19 17 10 58 102 -18 -18 46 22 -18 30 6 -19 37 20 -17 39 9 145 0 0 -18 53 20 19 17 14 59 102 -17 -19 1 28 -18 45 13 -19 52 22 -17 54 20 146 0 0 -19 8 6 19 17 19 60 101 -16 -19 16 13 -18 59 59 -20 7 2 -18 9 11 147 0 0 -19 22 30 19 17 23 61 101 -15 -19 30 36 -19 14 24 -20 21 22 -18 23 40 148 0 0 -19 36 34 19 17 27 62 101 -14 -19 44 39 -19 28 28 -20 35 20 -18 37 48 149 0 0 -19 50 16 19 17 31 63 100 -13 -19 58 21 -19 42 11 -20 48 57 -18 51 35 150 0 0 -20 3 37 19 17 35 64 100 -12 -20 11 41 -19 55 32 -21 2 13 -19 5 1 151 0 0 -20 16 36 19 17 39 65 99 -11 -20 24 40 -20 8 32 -21 15 8 -19 18 5 152 0 0 -20 29 14 19 17 44 66 99 -10 -20 37 17 -20 21 11 -21 27 41 -19 30 47 153 0 0 -20 41 30 19 17 48 67 98 -9 -20 49 32 -20 33 27 -21 39 53 -19 43 8 154 0 0 -20 53 24 19 17 52 68 98 -8 -21 1 26 -20 45 22 -21 51 43 -19 55 7 155 0 0 -21 4 56 19 17 57 69 97 -7 -21 12 58 -20 56 55 -22 3 11 -20 6 44 156 0 0 -21 16 7 19 18 1 70 97 -6 -21 24 7 -21 8 6 -22 14 17 -20 17 58 157 0 0 -21 26 55 19 18 5 71 96 -5 -21 34 55 -21 18 55 -22 25 1 -20 28 51 158 0 0 -21 37 21 19 18 10 72 96 -4 -21 45 21 -21 29 22 -22 35 23 -20 39 21 159 0 0 -21 47 25 19 18 14 73 95 -3 -21 55 24 -21 39 27 -22 45 23 -20 49 29 160 0 0 -21 57 7 19 18 18 74 94 -2 -22 5 6 -21 49 9 -22 55 1 -20 59 15 161 0 0 -22 6 27 19 18 23 75 94 -2 -22 14 25 -21 58 29 -23 4 17 -21 8 38 162 0 0 -22 15 24 19 18 27 76 93 -1 -22 23 21 -22 7 27 -23 13 11 -21 17 39 Uncertainty in time = +/- 4 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: TYC 6308-00226-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 17 36.5345 DE: -22 07 21.832 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .026 ) * V mag [mag]: 10.0 * B mag [mag]: 11.5 * Apparent position with proper motion RA(deg): 289.5267129469 DE(deg): -22.1094680082 * Equation of equinoxes (radians) : 0.000040818793946 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (1556) Wingolfia approx. diameter [km]: 29 approx. diameter ["]: .011 distance from Earth [AU]: 3.47700 * orbital information: orbit source: Preston date of fit: 2008 Feb 13 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 675 number of rejected observations: 15 time covered by the observations: 1942 Jan 14 - 2007 Aug 18 1 sigma uncertainty ellipse (major, minor, PA): 0.033, 0.023, 100° remarks: * orbital elements for (1556) Wingolfia : Mean anomaly = 283.19777899 deg Arg. of pericenter = 269.41846712 deg Long. of node = 91.70644180 deg Inclination = 15.77434622 deg Eccentricity = 0.11421813 Semimajor axis = 3.43103623 AU Perihelion dist = 3.03914969 AU Mag: H = 10.36, G = 0.15 Epoch of elements : MJD 54549.80500000 TDT (2008 Mar 24.805) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 24 1556 Wingolfia 19h 19.6m UT 10.0 19 17 36.535-22 7 21.83TYC 6308-00226-1 11.5 16.8 29 1.2 3.477 2.392 -1.84 176.8769 -22.122 -108.37 1.80 19.3261 -0.00017 -0.02601 13.14502 -0.72615 -0.00566 -0.00075 2000 281.6771832008 315.00000269.418467 91.706442 15.7743460.11421813 3.4310362 3.039149710.6 5.00.15 RATE 1.5508370 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.039 0.034 97 4.13 0.034 0 54510.5020080324_0226-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 19:28 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org