IOTA/IOTA-ES occultation update for (3182) Shimanto / TYC 6813-01071-1 event on 2008 Mar 01, 20:59 UT Visible from Japan, China Summary ------- On 2008 Mar 01 UT, the 27 km diameter asteroid (3182) Shimanto will occult a 10.1 mag star in the constellation Scorpius for observers along a path across Japan, China. In the case of an occultation, the combined light of the asteroid and the star will drop by 7.7 mag to 17.8 mag (the magnitude of the asteroid) for at most 1.6 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: 24 * date and approx. time of event: 2008 Mar 01, 20:56 - 2008 Mar 01, 20:59 UT * magnitude of target star: 10.1 * magnitude drop [mag]: 7.7 * estimated maximum duration [s]: 1.6 * Moon: 33 % sunlit, 17° distance * Sun: 87° distance * rough path description: Japan, China The occultation path -------------------- * approximate projected width [km]: 57 * 1 sigma uncertainty interval [path widths]: +/- 2.78 * 1 sigma uncertainty interval [seconds]: +/- 6.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .059 +/- .036) * 1 sigma uncertainty ellipse (major, minor, PA): ( .060", .036", 85° ) * approx speed of asteroid's shadow [km/s]: 16.8418 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 6813-01071-1 by 3182 Shimanto on 2008 Mar 1 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 Latitude Latitude Latitude Latitude 143 0 0 36 32 53 20 59 46 28 185 0 36 17 22 36 48 33 34 53 16 38 18 15 142 0 0 36 28 55 20 59 41 28 184 -1 36 13 24 36 44 33 34 49 25 38 14 8 141 0 0 36 25 45 20 59 35 28 183 -2 36 10 15 36 41 23 34 46 21 38 10 51 140 0 0 36 23 24 20 59 30 28 182 -3 36 7 55 36 39 1 34 44 5 38 8 25 139 0 0 36 21 53 20 59 24 28 181 -4 36 6 24 36 37 29 34 42 36 38 6 50 138 0 0 36 21 10 20 59 19 28 180 -4 36 5 41 36 36 46 34 41 54 38 6 6 137 0 0 36 21 16 20 59 14 28 179 -5 36 5 47 36 36 52 34 42 0 38 6 12 136 0 0 36 22 11 20 59 8 28 178 -6 36 6 42 36 37 47 34 42 53 38 7 9 135 0 0 36 23 55 20 59 3 28 177 -7 36 8 25 36 39 32 34 44 34 38 8 56 134 0 0 36 26 27 20 58 57 28 176 -8 36 10 57 36 42 5 34 47 2 38 11 35 133 0 0 36 29 49 20 58 52 28 175 -9 36 14 18 36 45 28 34 50 18 38 15 4 132 0 0 36 34 0 20 58 46 28 174 -9 36 18 28 36 49 40 34 54 21 38 19 23 131 0 0 36 38 59 20 58 41 28 173 -10 36 23 26 36 54 41 34 59 11 38 24 34 130 0 0 36 44 47 20 58 36 27 172 -11 36 29 12 37 0 31 35 4 49 38 30 34 129 0 0 36 51 25 20 58 31 27 171 -12 36 35 47 37 7 10 35 11 14 38 37 26 128 0 0 36 58 50 20 58 25 27 170 -13 36 43 11 37 14 38 35 18 26 38 45 8 127 0 0 37 7 5 20 58 20 27 169 -13 36 51 23 37 22 55 35 26 25 38 53 40 126 0 0 37 16 8 20 58 15 26 168 -14 37 0 23 37 32 1 35 35 12 39 3 3 125 0 0 37 25 59 20 58 10 26 167 -15 37 10 12 37 41 56 35 44 45 39 13 17 124 0 0 37 36 40 20 58 5 25 166 -16 37 20 49 37 52 39 35 55 5 39 24 21 123 0 0 37 48 8 20 58 0 25 165 -17 37 32 14 38 4 11 36 6 12 39 36 15 122 0 0 38 0 25 20 57 55 25 164 -17 37 44 26 38 16 32 36 18 6 39 48 59 121 0 0 38 13 30 20 57 50 24 163 -18 37 57 27 38 29 41 36 30 46 40 2 34 120 0 0 38 27 23 20 57 45 24 162 -19 38 11 16 38 43 38 36 44 12 40 16 59 119 0 0 38 42 4 20 57 41 23 161 -20 38 25 52 38 58 24 36 58 25 40 32 13 118 0 0 38 57 32 20 57 36 23 160 -21 38 41 16 39 13 58 37 13 24 40 48 18 117 0 0 39 13 49 20 57 32 22 159 -21 38 57 27 39 30 20 37 29 9 41 5 13 116 0 0 39 30 53 20 57 27 22 158 -22 39 14 26 39 47 29 37 45 39 41 22 57 115 0 0 39 48 44 20 57 23 21 157 -23 39 32 11 40 5 26 38 2 55 41 41 31 114 0 0 40 7 22 20 57 19 21 156 -23 39 50 44 40 24 11 38 20 56 42 0 54 113 0 0 40 26 48 20 57 15 20 155 -24 40 10 2 40 43 43 38 39 43 42 21 7 112 0 0 40 47 0 20 57 11 19 155 -25 40 30 8 41 4 2 38 59 14 42 42 9 111 0 0 41 7 58 20 57 7 19 154 -26 40 50 59 41 25 7 39 19 29 43 4 0 110 0 0 41 29 43 20 57 3 18 153 -26 41 12 36 41 47 0 39 40 29 43 26 40 109 0 0 41 52 13 20 57 0 17 152 -27 41 34 59 42 9 38 40 2 13 43 50 8 108 0 0 42 15 29 20 56 56 17 151 -27 41 58 7 42 33 3 40 24 40 44 14 25 107 0 0 42 39 30 20 56 53 16 150 -28 42 22 0 42 57 13 40 47 50 44 39 29 106 0 0 43 4 17 20 56 50 15 150 -29 42 46 37 43 22 8 41 11 43 45 5 22 105 0 0 43 29 48 20 56 47 14 149 -29 43 11 59 43 47 49 41 36 18 45 32 3 104 0 0 43 56 3 20 56 44 14 148 -30 43 38 4 44 14 14 42 1 36 45 59 30 103 0 0 44 23 1 20 56 41 13 147 -30 44 4 53 44 41 23 42 27 34 46 27 45 102 0 0 44 50 43 20 56 39 12 146 -31 44 32 24 45 9 16 42 54 13 46 56 46 101 0 0 45 19 8 20 56 36 11 146 -31 45 0 38 45 37 52 43 21 33 47 26 34 100 0 0 45 48 15 20 56 34 11 145 -32 45 29 34 46 7 11 43 49 33 47 57 8 99 0 0 46 18 4 20 56 32 10 144 -32 45 59 11 46 37 12 44 18 11 48 28 27 98 0 0 46 48 34 20 56 30 9 143 -32 46 29 29 47 7 54 44 47 28 49 0 32 97 0 0 47 19 45 20 56 28 8 143 -33 47 0 27 47 39 18 45 17 23 49 33 21 96 0 0 47 51 35 20 56 26 7 142 -33 47 32 4 48 11 22 45 47 55 50 6 54 95 0 0 48 24 5 20 56 25 6 141 -33 48 4 20 48 44 6 46 19 4 50 41 11 94 0 0 48 57 13 20 56 24 6 140 -34 48 37 13 49 17 29 .. .. .. 51 16 11 93 0 0 49 30 58 20 56 23 5 140 -34 49 10 44 49 51 30 .. .. .. 51 51 53 92 0 0 50 5 21 20 56 22 4 139 -34 49 44 51 50 26 9 .. .. .. 52 28 18 91 0 0 50 40 19 20 56 21 3 138 -34 50 19 33 51 1 24 .. .. .. 53 5 24 90 0 0 51 15 52 20 56 21 2 137 -35 50 54 50 51 37 15 .. .. .. 53 43 10 89 0 0 51 52 0 20 56 20 1 136 -35 51 30 40 52 13 41 .. .. .. .. .. .. 88 0 0 52 28 40 20 56 20 0 136 -35 52 7 3 52 50 40 .. .. .. .. .. .. Uncertainty in time = +/- 7 secs [Prediction of 2008 Feb 14.0] Data for the target star ------------------------ * name: TYC 6813-01071-1 * constellation : Scorpius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 16 51 13.3250 DE: -25 36 32.036 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .020, .021 ) * V mag [mag]: 10.1 * B mag [mag]: 10.3 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3182) Shimanto approx. diameter [km]: 27 approx. diameter ["]: .013 distance from Earth [AU]: 2.87000 * orbital information: orbit source: Preston date of fit: 2008 Jan 19 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 527 number of rejected observations: 23 time covered by the observations: 1946 Nov 16 - 2007 Jun 14 1 sigma uncertainty ellipse (major, minor, PA): 0.056, 0.029, 84° remarks: * orbital elements for (3182) Shimanto : Mean anomaly = 186.29997761 deg Arg. of pericenter = 161.48035663 deg Long. of node = 248.57281785 deg Inclination = 12.57444467 deg Eccentricity = 0.14356147 Semimajor axis = 2.61347171 AU Perihelion dist = 2.23827787 AU Mag: H = 11.74, G = 0.15 Epoch of elements : MJD 54526.87500000 TDT (2008 Mar 01.875) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Mar 1 3182 Shimanto 20h 59.3m UT 10.1 16 51 13.325-25 36 32.04TYC 6813-01071-1 10.3 17.8 27 1.6 2.870 2.153 0.10 137.9467 -25.608 -131.77 -7.19 20.9884 -0.00306 0.88021 9.50595 0.03275 -0.00587 0.00068 2000 184.6961792008 224.00000161.480357248.572818 12.5744450.14356147 2.6134717 2.238277912.2 5.00.15 RATE 2.3327990 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.060 0.036 85 3.78 0.036 0 54510.5020080301_1071-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Feb 14, 02:30 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org