IOTA/IOTA-ES occultation update for (3171) Wangshouguan / TYC 2404-00109-1 event on 2008 Oct 15, 05:10 UT Visible from E Canada, E USA, Caribbean, Central America Summary ------- On 2008 Oct 15 UT, the 45 km diameter asteroid (3171) Wangshouguan will occult a 11.5 mag star in the constellation Auriga for observers along a path across E Canada, E USA, Caribbean, Central America. In the case of an occultation, the combined light of the asteroid and the star will drop by 4.1 mag to 15.6 mag (the magnitude of the asteroid) for at most 6.2 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: 31 * date and approx. time of event: 2008 Oct 15, 04:59 - 2008 Oct 15, 05:20 UT * midpoint of event [JD]: 2454754.71534167 * magnitude of target star: 11.5 * magnitude drop [mag]: 4.1 * estimated maximum duration [s]: 6.2 * Moon: 100 % sunlit, 57° distance * Sun: 117° distance * rough path description: E Canada, E USA, Caribbean, Central America The occultation path -------------------- * approximate projected width [km]: 64 * 1 sigma uncertainty interval [path widths]: +/- 2.17 * 1 sigma uncertainty interval [seconds]: +/- 12.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .072 +/- .050) * 1 sigma uncertainty ellipse (major, minor, PA): ( .072", .050", 82° ) * approx speed of asteroid's shadow [km/s]: 7.2095 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 2404-00109-1 by 3171 Wangshouguan on 2008 Oct 15 Centre Star Star Sun Path Limit1 Path Limit2 Error Limit1 Error Limit2 E. Longitude Latitude U.T. Alt Az Alt o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " o ' " o ' " o ' " o ' " Longitude Latitude Longitude Latitude Longitude Latitude Longitude Latitude - 90 42 2 - 7 23 25 4 59 50 8 57 -70 - 91 46 20 - 7 55 23 - 89 46 0 - 6 56 40 ... .. .. .. .. .. - 86 32 17 - 5 32 2 - 87 38 18 - 4 25 45 5 0 6 12 56 -74 - 88 19 44 - 4 43 13 - 86 59 5 - 4 9 43 - 92 3 1 - 6 26 41 - 84 27 35 - 3 12 10 - 85 34 45 - 2 6 48 5 0 22 15 56 -77 - 86 8 40 - 2 19 26 - 85 1 59 - 1 54 55 - 88 53 54 - 3 25 53 - 82 50 32 - 1 10 27 - 83 58 51 - 0 5 56 5 0 38 17 57 -80 - 84 28 48 - 0 15 57 - 83 29 40 0 3 36 - 86 49 30 - 1 6 31 - 81 30 20 0 40 1 - 82 39 48 1 43 47 5 0 54 20 57 -82 - 83 7 14 1 35 26 - 82 12 55 1 51 46 - 85 13 44 0 54 14 - 80 21 47 2 22 39 - 81 32 23 3 25 44 5 1 9 21 57 -84 - 81 58 4 3 18 35 - 81 7 8 3 32 36 - 83 55 11 2 43 41 - 79 21 55 3 59 23 - 80 33 37 5 1 52 5 1 25 23 58 -86 - 80 58 1 4 55 36 - 80 9 34 5 7 53 - 82 48 27 4 25 18 - 78 28 50 5 31 28 - 79 41 37 6 33 24 5 1 41 25 58 -88 - 80 5 3 6 27 51 - 79 18 30 6 38 46 - 81 50 28 6 1 4 - 77 41 15 6 59 48 - 78 55 7 8 1 14 5 1 57 26 59 -89 - 79 17 47 7 56 15 - 78 32 43 8 6 3 - 80 59 21 7 32 16 - 76 58 14 8 24 59 - 78 13 12 9 25 59 5 2 12 28 59 -89 - 78 35 15 9 21 27 - 77 51 23 9 30 20 - 80 13 46 8 59 46 - 76 19 7 9 47 31 - 77 35 11 10 48 6 5 2 28 29 60 -87 - 77 56 44 10 43 58 - 77 13 50 10 52 5 - 79 32 49 10 24 11 - 75 43 22 11 7 46 - 77 0 32 12 7 57 5 2 44 30 60 -86 - 77 21 41 12 4 10 - 76 39 34 12 11 37 - 78 55 48 11 46 0 - 75 10 34 12 26 1 - 76 28 52 13 25 51 5 3 0 31 61 -84 - 76 49 42 13 22 21 - 76 8 12 13 29 14 - 78 22 13 13 5 34 - 74 40 23 13 42 31 - 75 59 51 14 42 1 5 3 15 32 62 -83 - 76 20 25 14 38 46 - 75 39 26 14 45 10 - 77 51 39 14 23 12 - 74 12 34 14 57 28 - 75 33 13 15 56 40 5 3 31 33 62 -82 - 75 53 35 15 53 38 - 75 13 0 15 59 35 - 77 23 46 15 39 7 - 73 46 54 16 11 1 - 75 8 46 17 9 56 5 3 47 34 63 -80 - 75 28 58 17 7 6 - 74 48 43 17 12 40 - 76 58 20 16 53 30 - 73 23 13 17 23 20 - 74 46 19 18 22 0 5 4 3 35 64 -79 - 75 6 23 18 19 20 - 74 26 23 18 24 33 - 76 35 6 18 6 33 - 73 1 20 18 34 31 - 74 25 43 19 32 56 5 4 19 36 64 -78 - 74 45 42 19 30 26 - 74 5 52 19 35 21 - 76 13 56 19 18 22 - 72 41 8 19 44 42 - 74 6 51 20 42 54 5 4 34 37 65 -77 - 74 26 46 20 40 32 - 73 47 4 20 45 10 - 75 54 39 20 29 7 - 72 22 31 20 53 58 - 73 49 37 21 51 56 5 4 50 38 66 -76 - 74 9 30 21 49 42 - 73 29 52 21 54 5 - 75 37 10 21 38 52 - 72 5 25 22 2 23 - 73 33 56 23 0 10 5 5 6 38 67 -74 - 73 53 48 22 58 2 - 73 14 11 23 2 12 - 75 21 22 22 47 43 - 71 49 43 23 10 3 - 73 19 43 24 7 38 5 5 22 39 68 -73 - 73 39 35 24 5 36 - 72 59 57 24 9 34 - 75 7 10 23 55 45 - 71 35 23 24 17 1 - 73 6 55 25 14 25 5 5 37 40 69 -72 - 73 26 49 25 12 29 - 72 47 7 25 16 16 - 74 54 31 25 3 3 - 71 22 22 25 23 20 - 72 55 29 26 20 35 5 5 53 40 70 -71 - 73 15 26 26 18 44 - 72 35 37 26 22 21 - 74 43 20 26 9 40 - 71 10 36 26 29 6 - 72 45 22 27 26 11 5 6 9 41 71 -70 - 73 5 24 27 24 24 - 72 25 26 27 27 53 - 74 33 36 27 15 40 - 71 0 4 27 34 19 - 72 36 34 28 31 15 5 6 25 41 71 -69 - 72 56 42 28 29 32 - 72 16 32 28 32 53 - 74 25 16 28 21 6 - 70 50 45 28 39 3 - 72 29 2 29 35 50 5 6 41 42 72 -68 - 72 49 17 29 34 11 - 72 8 54 29 37 25 - 74 18 19 29 26 0 - 70 42 36 29 43 21 - 72 22 47 30 40 0 5 6 56 42 73 -67 - 72 43 9 30 38 23 - 72 2 30 30 41 31 - 74 12 44 30 30 26 - 70 35 38 30 47 14 - 72 17 46 31 43 45 5 7 12 43 74 -66 - 72 38 17 31 42 11 - 71 57 21 31 45 14 - 74 8 30 31 34 26 - 70 29 49 31 50 46 - 72 14 2 32 47 9 5 7 28 43 75 -65 - 72 34 43 32 45 37 - 71 53 26 32 48 35 - 74 5 38 32 38 2 - 70 25 11 32 53 57 - 72 11 33 33 50 12 5 7 44 43 76 -64 - 72 32 25 33 48 43 - 71 50 46 33 51 37 - 74 4 8 33 41 16 - 70 21 42 33 56 51 - 72 10 21 34 52 58 5 7 59 44 77 -63 - 72 31 25 34 51 30 - 71 49 22 34 54 21 - 74 4 0 34 44 10 - 70 19 25 34 59 28 - 72 10 26 35 55 27 5 8 15 44 78 -62 - 72 31 44 35 54 1 - 71 49 14 35 56 49 - 74 5 16 35 46 46 - 70 18 19 36 1 51 - 72 11 51 36 57 42 5 8 31 44 79 -61 - 72 33 23 36 56 16 - 71 50 25 36 59 3 - 74 7 58 36 49 5 - 70 18 27 37 4 1 - 72 14 38 37 59 43 5 8 47 44 80 -60 - 72 36 25 37 58 18 - 71 52 56 38 1 4 - 74 12 8 37 51 9 - 70 19 51 38 5 59 - 72 18 48 39 1 33 5 9 2 45 81 -59 - 72 40 52 39 0 8 - 71 56 49 39 2 53 - 74 17 49 38 52 59 - 70 22 31 39 7 47 - 72 24 25 40 3 12 5 9 18 45 82 -58 - 72 46 48 40 1 46 - 72 2 8 40 4 32 - 74 25 4 39 54 36 - 70 26 32 40 9 26 - 72 31 33 41 4 41 5 9 34 45 83 -57 - 72 54 15 41 3 15 - 72 8 56 41 6 2 - 74 33 56 40 56 2 - 70 31 56 41 10 57 - 72 40 15 42 6 3 5 9 50 45 84 -56 - 73 3 18 42 4 36 - 72 17 17 42 7 25 - 74 44 30 41 57 18 - 70 38 46 42 12 22 - 72 50 35 43 7 17 5 10 6 45 85 -55 - 73 14 1 43 5 48 - 72 27 16 43 8 40 - 74 56 51 42 58 24 - 70 47 8 43 13 42 - 73 2 40 44 8 24 5 10 21 45 86 -54 - 73 26 30 44 6 54 - 72 38 56 44 9 49 - 75 11 5 43 59 21 - 70 57 5 44 14 57 - 73 16 35 45 9 26 5 10 37 45 87 -53 - 73 40 50 45 7 54 - 72 52 26 45 10 53 - 75 27 18 45 0 10 - 71 8 44 45 16 9 - 73 32 27 46 10 23 5 10 53 45 88 -52 - 73 57 9 46 8 48 - 73 7 50 46 11 52 - 75 45 37 46 0 52 - 71 22 10 46 17 18 - 73 50 23 47 11 16 5 11 9 45 89 -51 - 74 15 35 47 9 38 - 73 25 17 47 12 48 - 76 6 10 47 1 26 - 71 37 30 47 18 25 - 74 10 32 48 12 5 5 11 24 44 90 -50 - 74 36 15 48 10 23 - 73 44 54 48 13 41 - 76 29 8 48 1 54 - 71 54 53 48 19 32 - 74 33 4 49 12 50 5 11 40 44 90 -49 - 74 59 21 49 11 4 - 74 6 53 49 14 30 - 76 54 40 49 2 15 - 72 14 27 49 20 37 - 74 58 10 50 13 32 5 11 56 44 91 -48 - 75 25 3 50 11 41 - 74 31 23 50 15 17 - 77 22 59 50 2 28 - 72 36 23 50 21 42 - 75 26 3 51 14 10 5 12 12 44 92 -47 - 75 53 34 51 12 14 - 74 58 38 51 16 0 - 77 54 18 51 2 35 - 73 0 52 51 22 47 - 75 56 56 52 14 45 5 12 27 43 92 -46 - 76 25 9 52 12 42 - 75 28 50 52 16 41 - 78 28 52 52 2 33 - 73 28 7 52 23 52 - 76 31 7 53 15 15 5 12 43 43 93 -45 - 77 0 3 53 13 5 - 76 2 17 53 17 18 - 79 6 57 53 2 22 - 73 58 24 53 24 57 - 77 8 52 54 15 40 5 12 59 43 93 -44 - 77 38 36 54 13 22 - 76 39 15 54 17 51 - 79 48 55 54 2 0 - 74 31 59 54 26 1 - 77 50 34 55 15 58 5 13 15 42 94 -43 - 78 21 8 55 13 31 - 77 20 6 55 18 18 - 80 35 6 55 1 26 - 75 9 12 55 27 4 - 78 36 36 56 16 8 5 13 31 42 94 -42 - 79 8 4 56 13 31 - 78 5 14 56 18 38 - 81 25 57 56 0 37 - 75 50 25 56 28 4 - 79 27 24 57 16 8 5 13 46 41 94 -41 - 79 59 50 57 13 19 - 78 55 5 57 18 49 - 82 21 54 56 59 30 - 76 36 4 57 29 1 - 80 23 31 58 15 54 5 14 2 41 94 -40 - 80 56 59 58 12 51 - 79 50 9 58 18 48 - 83 23 30 57 58 1 - 77 26 39 58 29 51 - 81 25 30 59 15 22 5 14 18 40 94 -39 - 82 0 5 59 12 5 - 80 51 2 59 18 31 - 84 31 23 58 56 5 - 78 22 42 59 30 32 - 82 34 4 60 14 28 5 14 34 39 94 -38 - 83 9 50 60 10 54 - 81 58 25 60 17 53 - 85 46 13 59 53 36 - 79 24 53 60 31 1 - 83 49 58 61 13 6 5 14 49 39 94 -37 - 84 27 0 61 9 13 - 83 13 3 61 16 50 - 87 8 48 60 50 27 - 80 33 57 61 31 13 - 85 14 6 62 11 8 5 15 5 38 93 -36 - 85 52 28 62 6 54 - 84 35 49 62 15 13 - 88 40 1 61 46 27 - 81 50 47 62 31 1 - 86 47 28 63 8 25 5 15 21 37 93 -35 - 87 27 16 63 3 45 - 86 7 45 63 12 53 - 90 20 52 62 41 25 - 83 16 21 63 30 18 - 88 31 14 64 4 44 5 15 37 37 92 -34 - 89 12 32 63 59 36 - 87 50 0 64 9 39 - 92 12 30 63 35 7 - 84 51 50 64 28 55 - 90 26 43 64 59 50 5 15 52 36 91 -33 - 91 9 35 64 54 11 - 89 43 53 65 5 17 - 94 16 8 64 27 15 - 86 38 35 65 26 39 - 92 35 21 65 53 25 5 16 8 35 90 -32 - 93 19 51 65 47 10 - 91 50 52 65 59 28 - 96 33 10 65 17 28 - 88 38 6 66 23 14 - 94 58 47 66 45 6 5 16 24 34 88 -31 - 95 44 57 66 38 10 - 94 12 37 66 51 49 - 99 5 3 66 5 18 - 90 52 8 67 18 21 - 97 38 47 67 34 24 5 16 40 33 86 -30 - 98 26 35 67 26 41 - 96 50 56 67 41 53 -101 53 21 66 50 13 - 93 22 38 68 11 35 -100 37 13 68 20 43 5 16 56 32 84 -29 -101 26 35 68 12 6 - 99 47 43 68 29 5 -104 59 37 67 31 33 - 96 11 45 69 2 24 -103 55 56 69 3 20 5 17 11 31 82 -28 -104 46 44 68 53 41 -103 4 57 69 12 42 -108 25 17 68 8 29 - 99 21 46 69 50 11 -107 36 40 69 41 21 5 17 27 30 79 -27 -108 28 40 69 30 32 -106 44 27 69 51 51 -112 11 34 68 40 2 -102 54 58 70 34 5 -111 40 50 70 13 40 5 17 43 29 76 -26 -112 33 37 70 1 32 -110 47 43 70 25 28 -116 19 13 69 5 2 -106 53 28 71 13 6 -116 9 9 70 39 0 5 17 59 27 72 -25 -117 2 13 70 25 22 -115 15 41 70 52 16 -120 48 19 69 22 6 -111 18 53 71 46 2 -121 1 24 70 55 49 5 18 14 26 68 -23 -121 54 6 70 40 30 -120 8 15 71 10 44 -125 38 3 69 29 34 -116 11 56 72 11 25 -126 16 4 71 2 19 5 18 30 24 63 -22 -127 7 38 70 45 8 -125 24 1 71 19 7 -130 46 33 69 25 30 -121 31 52 72 27 32 -131 50 7 70 56 28 5 18 46 23 59 -21 -132 39 47 70 37 8 -130 59 59 71 15 21 -136 10 51 69 7 30 -127 16 7 72 32 25 -137 39 5 70 35 48 5 19 2 21 53 -19 -138 26 10 70 14 0 -136 51 36 70 57 5 -141 47 19 68 32 36 -133 19 56 72 23 52 -143 37 29 69 57 21 5 19 17 19 48 -18 -144 21 37 69 32 37 -142 53 9 70 21 27 -147 32 15 67 36 31 -139 36 44 71 59 22 -149 39 56 68 57 2 5 19 33 17 43 -16 -150 21 12 68 28 31 -148 58 44 69 24 39 -153 23 37 66 12 20 -145 58 48 71 15 59 -155 42 43 67 28 13 5 19 49 14 37 -15 -156 22 7 66 54 15 -155 3 53 68 0 49 -159 24 50 64 5 21 -152 18 48 70 9 44 -161 47 24 65 17 11 5 20 5 11 32 -13 -162 28 8 64 33 17 -161 8 25 65 58 19 -166 5 54 60 23 54 -158 31 41 68 34 13 -168 17 1 61 38 24 5 20 21 6 26 -10 -169 16 13 60 19 55 -167 27 16 62 43 23 ... .. .. .. .. .. -164 38 4 66 15 59 Uncertainty in time = +/- 16 secs [Prediction of 2008 Sep 11.0] Data for the target star ------------------------ * name: TYC 2404-00109-1 * constellation : Auriga * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 05 38 03.7434 DE: +31 37 43.997 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .017, .017 ) * V mag [mag]: 11.5 * B mag [mag]: 12.1 * Apparent position with proper motion RA(deg): 84.6646462769 DE(deg): 31.6349161129 * Equation of equinoxes (radians) : 0.000047059916099 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (3171) Wangshouguan approx. diameter [km]: 45 approx. diameter ["]: .029 distance from Earth [AU]: 2.15500 * orbital information: orbit source: Preston date of fit: 2008 Sep 05 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 598 number of rejected observations: 9 time covered by the observations: 1962 Nov 24 - 2008 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.070, 0.047, 82° remarks: * orbital elements for (3171) Wangshouguan : Mean anomaly = 7.36467037 deg Arg. of pericenter = 25.02058693 deg Long. of node = 31.95316043 deg Inclination = 11.39457597 deg Eccentricity = 0.13900537 Semimajor axis = 3.18621409 AU Perihelion dist = 2.74331323 AU Mag: H = 10.90, G = 0.15 Epoch of elements : MJD 54754.21500000 TDT (2008 Oct 15.215) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 Oct 15 3171 Wangshouguan 5h 10.1m UT 11.5 5 38 3.743 31 37 44.00TYC 2404-00109-1 12.1 15.6 45 6.2 2.155 0.669 14.24 -17.1181 31.625 98.92 -8.65 5.1682 -0.60517 0.36387 2.09670 3.48747 -0.00510 -0.00057 2000 6.63422220081011.00000 25.020587 31.953160 11.3945760.13900537 3.1862141 2.743313210.8 5.00.15 RATE 1.7329730 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.072 0.050 82 3.17 0.063 0 54720.5020081015_0109-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Sep 11, 20:12 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org