IOTA/IOTA-ES occultation update for (2725) David Bender / TYC 7430-01751-1 event on 2008 May 19, 16:40 UT Visible from Australia, Japan Summary ------- On 2008 May 19 UT, the 40 km diameter asteroid (2725) David Bender will occult a 9.5 mag star in the constellation Sagittarius for observers along a path across Australia, Japan. In the case of an occultation, the combined light of the asteroid and the star will drop by 6.6 mag to 16.1 mag (the magnitude of the asteroid) for at most 5.0 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: 20 * date and approx. time of event: 2008 May 19, 16:30 - 2008 May 19, 16:51 UT * midpoint of event [JD]: 2454606.19510417 * magnitude of target star: 9.5 * magnitude drop [mag]: 6.6 * estimated maximum duration [s]: 5.0 * Moon: 100 % sunlit, 57° distance * Sun: 126° distance * rough path description: Australia, Japan The occultation path -------------------- * approximate projected width [km]: 53 * 1 sigma uncertainty interval [path widths]: +/- 3.38 * 1 sigma uncertainty interval [seconds]: +/- 12.6 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .069 +/- .048) * 1 sigma uncertainty ellipse (major, minor, PA): ( .069", .048", 88° ) * approx speed of asteroid's shadow [km/s]: 7.9788 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 7430-01751-1 by 2725 David Bender on 2008 May 19 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 127 31 38 47 0 0 16 30 51 1 145 -22 127 5 54 127 57 9 ... .. .. ... .. .. 128 28 54 46 0 0 16 30 51 2 146 -22 128 4 7 128 53 28 125 10 45 ... .. .. 129 21 30 45 0 0 16 30 52 3 146 -23 128 57 35 129 45 14 126 10 38 ... .. .. 130 9 55 44 0 0 16 30 54 5 147 -24 129 46 46 130 32 54 127 5 32 ... .. .. 130 54 32 43 0 0 16 30 56 6 147 -25 130 32 5 131 16 49 127 55 59 ... .. .. 131 35 40 42 0 0 16 30 58 7 148 -25 131 13 51 131 57 20 128 42 24 ... .. .. 132 13 38 41 0 0 16 31 0 8 148 -26 131 52 23 132 34 44 129 25 9 134 54 10 132 48 39 40 0 0 16 31 3 9 149 -27 132 27 57 133 9 14 130 4 33 135 25 23 133 20 58 39 0 0 16 31 6 10 149 -28 133 0 45 133 41 5 130 40 52 135 54 10 133 50 47 38 0 0 16 31 10 11 149 -28 133 31 0 134 10 26 131 14 20 136 20 43 134 18 14 37 0 0 16 31 14 12 149 -29 133 58 52 134 37 29 131 45 10 136 45 10 134 43 30 36 0 0 16 31 18 13 150 -30 134 24 31 135 2 23 132 13 34 137 7 38 135 6 42 35 0 0 16 31 23 14 150 -31 134 48 5 135 25 14 132 39 39 137 28 15 135 27 59 34 0 0 16 31 27 15 150 -31 135 9 41 135 46 11 133 3 35 137 47 7 135 47 25 33 0 0 16 31 33 16 150 -32 135 29 26 136 5 20 133 25 31 138 4 19 136 5 8 32 0 0 16 31 38 17 150 -33 135 47 26 136 22 46 133 45 31 138 19 57 136 21 13 31 0 0 16 31 44 18 150 -34 136 3 46 136 38 35 134 3 44 138 34 4 136 35 44 30 0 0 16 31 50 19 150 -34 136 18 32 136 52 51 134 20 14 138 46 47 136 48 45 29 0 0 16 31 56 20 150 -35 136 31 47 137 5 39 134 35 5 138 58 7 137 0 21 28 0 0 16 32 2 21 150 -36 136 43 35 137 17 2 134 48 24 139 8 8 137 10 35 27 0 0 16 32 9 22 150 -37 136 54 1 137 27 5 135 0 14 139 16 54 137 19 30 26 0 0 16 32 16 23 150 -38 137 3 8 137 35 49 135 10 38 139 24 28 137 27 10 25 0 0 16 32 24 24 150 -38 137 10 58 137 43 19 135 19 40 139 30 51 137 33 36 24 0 0 16 32 31 25 150 -39 137 17 34 137 49 36 135 27 22 139 36 7 137 38 52 23 0 0 16 32 39 26 150 -40 137 22 58 137 54 43 135 33 48 139 40 18 137 42 59 22 0 0 16 32 47 27 150 -41 137 27 13 137 58 42 135 39 0 139 43 24 137 46 0 21 0 0 16 32 55 28 149 -41 137 30 21 138 1 35 135 43 0 139 45 29 137 47 55 20 0 0 16 33 4 29 149 -42 137 32 23 138 3 23 135 45 51 139 46 33 137 48 47 19 0 0 16 33 13 29 149 -43 137 33 22 138 4 9 135 47 33 139 46 38 137 48 37 18 0 0 16 33 22 30 149 -44 137 33 18 138 3 54 135 48 8 139 45 46 137 47 27 17 0 0 16 33 31 31 148 -45 137 32 12 138 2 38 135 47 39 139 43 56 137 45 17 16 0 0 16 33 41 32 148 -45 137 30 6 138 0 23 135 46 5 139 41 11 137 42 7 15 0 0 16 33 50 33 148 -46 137 27 2 137 57 10 135 43 29 139 37 31 137 38 0 14 0 0 16 34 0 34 147 -47 137 22 58 137 53 0 135 39 50 139 32 57 137 32 56 13 0 0 16 34 11 34 147 -48 137 17 57 137 47 52 135 35 11 139 27 30 137 26 55 12 0 0 16 34 21 35 147 -49 137 11 58 137 41 49 135 29 30 139 21 9 137 19 58 11 0 0 16 34 32 36 146 -49 137 5 3 137 34 49 135 22 49 139 13 55 137 12 4 10 0 0 16 34 42 37 146 -50 136 57 11 137 26 54 135 15 9 139 5 49 137 3 15 9 0 0 16 34 54 38 145 -51 136 48 23 137 18 3 135 6 28 138 56 50 136 53 29 8 0 0 16 35 5 38 145 -52 136 38 38 137 8 17 134 56 48 138 46 59 136 42 48 7 0 0 16 35 16 39 144 -53 136 27 57 136 57 36 134 46 9 138 36 15 136 31 11 6 0 0 16 35 28 40 143 -53 136 16 20 136 45 58 134 34 29 138 24 39 136 18 37 5 0 0 16 35 40 40 143 -54 136 3 45 136 33 25 134 21 49 138 12 10 136 5 6 4 0 0 16 35 52 41 142 -55 135 50 13 136 19 56 134 8 8 137 58 48 135 50 38 3 0 0 16 36 4 42 141 -56 135 35 43 136 5 29 133 53 26 137 44 32 135 35 11 2 0 0 16 36 17 42 141 -57 135 20 15 135 50 5 133 37 42 137 29 21 135 18 46 1 0 0 16 36 29 43 140 -58 135 3 47 135 33 42 133 20 54 137 13 15 135 1 21 0 0 0 16 36 42 44 139 -58 134 46 18 135 16 20 133 3 3 136 56 13 134 42 55 - 1 0 0 16 36 55 44 138 -59 134 27 48 134 57 57 132 44 6 136 38 14 134 23 26 - 2 0 0 16 37 9 45 138 -60 134 8 15 134 38 33 132 24 2 136 19 16 134 2 54 - 3 0 0 16 37 22 45 137 -61 133 47 38 134 18 6 132 2 50 135 59 20 133 41 16 - 4 0 0 16 37 36 46 136 -62 133 25 55 133 56 33 131 40 27 135 38 22 133 18 31 - 5 0 0 16 37 49 46 135 -63 133 3 4 133 33 55 131 16 52 135 16 22 132 54 37 - 6 0 0 16 38 3 47 134 -63 132 39 4 133 10 7 130 52 3 134 53 17 132 29 32 - 7 0 0 16 38 18 47 133 -64 132 13 51 132 45 10 130 25 57 134 29 6 132 3 13 - 8 0 0 16 38 32 48 132 -65 131 47 24 132 18 59 129 58 31 134 3 47 131 35 38 - 9 0 0 16 38 46 48 131 -66 131 19 40 131 51 32 129 29 43 133 37 17 131 6 43 -10 0 0 16 39 1 48 130 -67 130 50 35 131 22 47 128 59 27 133 9 34 130 36 26 -11 0 0 16 39 16 49 129 -68 130 20 7 130 52 40 128 27 42 132 40 34 Latitude Latitude Latitude Latitude 129 0 0 -13 54 21 16 40 0 49 125 -70 -13 25 35 -14 22 43 - 9 58 57 -17 25 14 128 0 0 -15 32 0 16 40 26 49 123 -71 -15 4 43 -15 58 56 -11 50 5 -18 53 6 127 0 0 -17 2 41 16 40 50 49 122 -73 -16 36 40 -17 28 24 -13 32 5 -20 15 18 126 0 0 -18 27 13 16 41 13 49 120 -74 -18 2 18 -18 51 52 -15 6 17 -21 32 24 125 0 0 -19 46 16 16 41 35 49 118 -75 -19 22 19 -20 9 59 -16 33 44 -22 44 51 124 0 0 -21 0 24 16 41 56 49 117 -75 -20 37 18 -21 23 17 -17 55 12 -23 53 6 123 0 0 -22 10 3 16 42 16 49 116 -76 -21 47 43 -22 32 12 -19 11 22 -24 57 28 122 0 0 -23 15 38 16 42 35 49 115 -77 -22 53 59 -23 37 7 -20 22 45 -25 58 15 121 0 0 -24 17 28 16 42 53 48 114 -77 -23 56 26 -24 38 21 -21 29 48 -26 55 44 120 0 0 -25 15 50 16 43 10 48 113 -78 -24 55 22 -25 36 10 -22 32 53 -27 50 8 119 0 0 -26 11 0 16 43 27 47 112 -78 -25 51 2 -26 30 50 -23 32 20 -28 41 39 118 0 0 -27 3 11 16 43 43 47 111 -78 -26 43 41 -27 22 33 -24 28 25 -29 30 28 117 0 0 -27 52 34 16 43 59 46 110 -79 -27 33 30 -28 11 30 -25 21 23 -30 16 45 116 0 0 -28 39 19 16 44 14 46 110 -79 -28 20 40 -28 57 53 -26 11 26 -31 0 40 115 0 0 -29 23 38 16 44 28 45 109 -79 -29 5 20 -29 41 49 -26 58 45 -31 42 19 114 0 0 -30 5 36 16 44 42 45 109 -78 -29 47 39 -30 23 28 -27 43 31 -32 21 50 113 0 0 -30 45 23 16 44 56 44 108 -78 -30 27 44 -31 2 56 -28 25 53 -32 59 19 112 0 0 -31 23 5 16 45 9 44 108 -78 -31 5 44 -31 40 21 -29 5 59 -33 34 53 111 0 0 -31 58 48 16 45 22 43 108 -78 -31 41 43 -32 15 48 -29 43 56 -34 8 38 110 0 0 -32 32 38 16 45 34 43 107 -77 -32 15 49 -32 49 23 -30 19 50 -34 40 37 109 0 0 -33 4 41 16 45 46 42 107 -77 -32 48 5 -33 21 11 -30 53 48 -35 10 55 108 0 0 -33 35 0 16 45 57 41 107 -76 -33 18 37 -33 51 17 -31 25 54 -35 39 38 107 0 0 -34 3 40 16 46 8 41 107 -76 -33 47 30 -34 19 46 -31 56 14 -36 6 48 106 0 0 -34 30 45 16 46 19 40 107 -75 -34 14 47 -34 46 40 -32 24 52 -36 32 29 105 0 0 -34 56 19 16 46 30 39 107 -75 -34 40 32 -35 12 3 -32 51 53 -36 56 44 104 0 0 -35 20 26 16 46 40 39 107 -74 -35 4 48 -35 36 0 -33 17 20 -37 19 37 103 0 0 -35 43 7 16 46 50 38 107 -74 -35 27 39 -35 58 32 -33 41 16 -37 41 10 102 0 0 -36 4 27 16 46 59 38 107 -73 -35 49 7 -36 19 43 -34 3 45 -38 1 26 101 0 0 -36 24 27 16 47 9 37 107 -73 -36 9 15 -36 39 35 -34 24 50 -38 20 27 100 0 0 -36 43 10 16 47 18 36 108 -72 -36 28 5 -36 58 11 -34 44 32 -38 38 16 99 0 0 -37 0 38 16 47 27 36 108 -71 -36 45 40 -37 15 32 -35 2 55 -38 54 53 98 0 0 -37 16 53 16 47 35 35 108 -71 -37 2 1 -37 31 41 -35 20 1 -39 10 22 97 0 0 -37 31 57 16 47 44 34 108 -70 -37 17 11 -37 46 40 -35 35 51 -39 24 43 96 0 0 -37 45 52 16 47 52 34 109 -70 -37 31 11 -38 0 29 -35 50 28 -39 37 59 95 0 0 -37 58 39 16 48 0 33 109 -69 -37 44 3 -38 13 11 -36 3 54 -39 50 10 94 0 0 -38 10 19 16 48 8 32 109 -69 -37 55 47 -38 24 47 -36 16 8 -40 1 18 93 0 0 -38 20 54 16 48 15 32 109 -68 -38 6 26 -38 35 18 -36 27 14 -40 11 24 92 0 0 -38 30 24 16 48 23 31 110 -67 -38 16 0 -38 44 45 -36 37 12 -40 20 29 91 0 0 -38 38 51 16 48 30 30 110 -67 -38 24 30 -38 53 9 -36 46 3 -40 28 34 90 0 0 -38 46 16 16 48 37 30 111 -66 -38 31 57 -39 0 31 -36 53 48 -40 35 39 89 0 0 -38 52 38 16 48 44 29 111 -66 -38 38 22 -39 6 52 -37 0 27 -40 41 46 88 0 0 -38 58 0 16 48 51 28 111 -65 -38 43 45 -39 12 12 -37 6 3 -40 46 55 87 0 0 -39 2 20 16 48 57 28 112 -64 -38 48 7 -39 16 31 -37 10 34 -40 51 5 86 0 0 -39 5 41 16 49 3 27 112 -64 -38 51 28 -39 19 50 -37 14 1 -40 54 19 85 0 0 -39 8 1 16 49 10 26 113 -63 -38 53 48 -39 22 10 -37 16 25 -40 56 35 84 0 0 -39 9 21 16 49 16 26 113 -63 -38 55 9 -39 23 30 -37 17 46 -40 57 54 83 0 0 -39 9 41 16 49 22 25 114 -62 -38 55 28 -39 23 50 -37 18 3 -40 58 16 82 0 0 -39 9 1 16 49 28 24 114 -61 -38 54 48 -39 23 11 -37 17 17 -40 57 42 81 0 0 -39 7 21 16 49 33 24 115 -61 -38 53 6 -39 21 32 -37 15 28 -40 56 9 80 0 0 -39 4 40 16 49 39 23 115 -60 -38 50 24 -39 18 52 -37 12 34 -40 53 40 79 0 0 -39 0 58 16 49 44 22 116 -59 -38 46 40 -39 15 13 -37 8 36 -40 50 13 78 0 0 -38 56 15 16 49 49 21 116 -59 -38 41 54 -39 10 32 -37 3 34 -40 45 47 77 0 0 -38 50 29 16 49 54 21 117 -58 -38 36 6 -39 4 49 -36 57 25 -40 40 22 76 0 0 -38 43 41 16 49 59 20 117 -58 -38 29 14 -38 58 4 -36 50 10 -40 33 58 75 0 0 -38 35 49 16 50 4 19 118 -57 -38 21 18 -38 50 15 -36 41 47 -40 26 34 74 0 0 -38 26 51 16 50 9 18 118 -56 -38 12 17 -38 41 22 -36 32 16 -40 18 8 73 0 0 -38 16 48 16 50 13 18 119 -56 -38 2 9 -38 31 24 -36 21 34 -40 8 39 72 0 0 -38 5 38 16 50 17 17 119 -55 -37 50 53 -38 20 18 -36 9 41 -39 58 7 71 0 0 -37 53 18 16 50 22 16 120 -54 -37 38 28 -38 8 5 -35 56 35 -39 46 30 70 0 0 -37 39 48 16 50 26 15 120 -54 -37 24 51 -37 54 41 -35 42 13 -39 33 46 69 0 0 -37 25 5 16 50 30 15 121 -53 -37 10 2 -37 40 5 -35 26 34 -39 19 55 68 0 0 -37 9 8 16 50 33 14 121 -52 -36 53 57 -37 24 15 -35 9 36 -39 4 53 67 0 0 -36 51 54 16 50 37 13 122 -52 -36 36 35 -37 7 9 -34 51 15 -38 48 39 66 0 0 -36 33 21 16 50 40 12 123 -51 -36 17 53 -36 48 45 -34 31 30 -38 31 11 65 0 0 -36 13 26 16 50 44 11 123 -50 -35 57 48 -36 28 59 -34 10 16 -38 12 27 64 0 0 -35 52 6 16 50 47 10 124 -50 -35 36 18 -36 7 49 -33 47 31 -37 52 22 63 0 0 -35 29 17 16 50 49 9 124 -49 -35 13 18 -35 45 12 -33 23 11 -37 30 56 62 0 0 -35 4 56 16 50 52 9 125 -48 -34 48 45 -35 21 3 -32 57 11 -37 8 4 61 0 0 -34 39 0 16 50 54 8 125 -47 -34 22 35 -34 55 19 -32 29 27 -36 43 43 60 0 0 -34 11 22 16 50 57 7 126 -47 -33 54 44 -34 27 56 -31 59 53 .. .. .. 59 0 0 -33 42 0 16 50 59 6 126 -46 -33 25 6 -33 58 48 -31 28 25 .. .. .. 58 0 0 -33 10 46 16 51 0 5 127 -45 -32 53 36 -33 27 51 -30 54 55 .. .. .. 57 0 0 -32 37 36 16 51 2 4 127 -44 -32 20 8 -32 54 59 -30 19 17 .. .. .. 56 0 0 -32 2 22 16 51 3 3 128 -44 -31 44 34 -32 20 4 -29 41 22 .. .. .. 55 0 0 -31 24 57 16 51 4 2 128 -43 -31 6 48 -31 43 0 -29 1 3 .. .. .. 54 0 0 -30 45 13 16 51 4 1 129 -42 -30 26 41 -31 3 38 .. .. .. .. .. .. Uncertainty in time = +/- 17 secs [Prediction of 2008 Apr 13.0] Data for the target star ------------------------ * name: TYC 7430-01751-1 * constellation : Sagittarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 19 44 28.1613 DE: -33 14 03.252 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .021, .027 ) * V mag [mag]: 9.5 * B mag [mag]: 9.7 * Apparent position with proper motion RA(deg): 296.2592673992 DE(deg): -33.2134508696 * Equation of equinoxes (radians) : 0.000039654816268 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (2725) David Bender approx. diameter [km]: 40 approx. diameter ["]: .020 distance from Earth [AU]: 2.78600 * orbital information: orbit source: Preston date of fit: 2008 Apr 08 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 600 number of rejected observations: 21 time covered by the observations: 1904 Nov 16 - 2007 Aug 09 1 sigma uncertainty ellipse (major, minor, PA): 0.066, 0.040, 88° remarks: * orbital elements for (2725) David Bender : Mean anomaly = 195.89679910 deg Arg. of pericenter = 25.56266091 deg Long. of node = 61.93345475 deg Inclination = 15.56295181 deg Eccentricity = 0.14712596 Semimajor axis = 3.04313579 AU Perihelion dist = 2.59541152 AU Mag: H = 10.71, G = 0.15 Epoch of elements : MJD 54605.69400000 TDT (2008 May 19.694) ------ occelmnt file for Occult BEGIN ----------------------------------- 2008 May 19 2725 David Bender 16h 41.0m UT 9.5 19 44 28.161-33 14 3.25TYC 7430-01751-1 9.7 16.1 40 5.0 2.786 -0.248 -13.88 168.1575 -33.230 -71.11 19.95 16.6825 -0.63345 0.14120 -0.97993 -4.39557 -0.00462 -0.00013 2000 194.8396422008 514.00000 25.562661 61.933455 15.5629520.14712596 3.0431358 2.595411510.4 5.00.15 RATE 1.8566160 0.000000 0.000000 0.000000 0.0000000 0.0000000 0.0000000 Meas 0.069 0.048 88 4.38 0.068 0 54569.5020080519_1751-1 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2008 Apr 13, 03:22 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org