Input measurement type: Azimuth +east of due north for meas1, Elevation angle above the horizon for meas2 Uncertainties type: Uncertainties computed using MC runs with lower cost function value than the purely geometric solution Reference JD: 2458400.504594907630 Time: 2018-10-09 00:06:37.000019 UTC Plane intersections ------------------- Intersection 1 - Stations: 2 and 1 Convergence angle = 28.62224 deg R.A. = 265.71519 Dec = +55.80671 deg Best intersection: Stations 2 and 1 with Qconv = 28.62 deg Least squares solution ---------------------- State vector (ECI, epoch of date): X = 2196161.27 +/- 3.81 m Y = -4158000.50 +/- 10.85 m Z = 4441453.35 +/- 23.70 m Vx = -1194.36 +/- 6.11 m/s Vy = -12295.35 +/- 24.65 m/s Vz = 17932.52 +/- 49.95 m/s State vector covariance matrix (X, Y, Z, Vx, Vy, Vz): +1.529371e+01, -3.719957e+01, +8.463586e+01, +3.556192e+01, +8.235041e+01, -7.746031e+01 -3.719957e+01, +1.234858e+02, -2.668464e+02, -8.593729e+01, -2.202977e+02, +2.014394e+02 +8.463586e+01, -2.668464e+02, +5.893174e+02, +1.920724e+02, +5.070608e+02, -4.605306e+02 +3.556192e+01, -8.593729e+01, +1.920724e+02, +1.086168e+02, +1.923564e+02, -1.582701e+02 +8.235041e+01, -2.202977e+02, +5.070608e+02, +1.923564e+02, +1.061220e+03, -1.354282e+03 -7.746031e+01, +2.014394e+02, -4.605306e+02, -1.582701e+02, -1.354282e+03, +1.902253e+03 Timing offsets (from input data): 2: 0.000000 s 1: -0.000635 s Reference point on the trajectory: Time: 2018-10-09 00:06:37.000019 UTC Lon = -81.378875 +/- 0.0000 deg Lat = +43.554815 +/- 0.0001 deg Lat geo = +43.365647 +/- 0.0001 deg Ht = 100284.43 +/- 24.37 m JD dynamic = 2458400.505395648535 LST apparent = 297.8419950396 deg Radiant (apparent in ECI which includes Earth's rotation, epoch of date): R.A. = 264.45177 +/- 0.0398 deg Dec = +55.43810 +/- 0.0223 deg Azimuth = +310.89987 +/- 0.0639 deg Elevation = +65.60351 +/- 0.0176 deg Vavg = 22.23285 +/- 0.0207 km/s Vinit = 21.77561 +/- 0.0548 km/s Radiant (apparent ground-fixed, epoch of date): R.A. = 265.80002 +/- 0.0398 deg Dec = +55.84165 +/- 0.0223 deg Azimuth = +312.37215 +/- 0.0639 deg Elevation = +66.22064 +/- 0.0176 deg Vavg = 22.12824 +/- 0.0207 km/s Vinit = 21.67101 +/- 0.0548 km/s Radiant (geocentric, J2000): R.A. = 261.14760 +/- 0.0431 deg Dec = +55.90950 +/- 0.0254 deg Vg = 18.73320 +/- 0.0637 km/s Vinf = 21.77561 +/- 0.0548 km/s Zc = 24.52074 +/- 0.0175 deg Zg = 26.39083 +/- 0.0206 deg Radiant (ecliptic geocentric, J2000): Lg = 244.23817 +/- 0.0952 deg Bg = +78.55329 +/- 0.0295 deg Vh = 37.48521 +/- 0.0421 km/s Radiant (ecliptic heliocentric, J2000): Lh = 281.97905 +/- 0.0200 deg Bh = +29.33090 +/- 0.0731 deg Vh_x = -6.78283 +/- 0.0091 km/s Vh_y = 31.96815 +/- 0.0159 km/s Vh_z = -18.36223 +/- 0.0621 km/s Orbit: La Sun = 195.400696 +/- 0.0000 deg a = 2.392558 +/- 0.0202 AU e = 0.583963 +/- 0.0035 i = 29.374611 +/- 0.0735 deg peri = 171.906961 +/- 0.0384 deg node = 195.401797 +/- 0.0000 deg Pi = 7.308758 +/- 0.0384 deg q = 0.995393 +/- 0.0000 AU f = 8.090651 +/- 0.0384 deg M = 1.729315 +/- 0.0275 deg Q = 3.789724 +/- 0.0405 AU n = 0.266324 +/- 0.0034 deg/day T = 3.700790 +/- 0.0469 years Last perihelion JD = 2458394.012119 (2018-10-02 12:17:27.104841) +/- 0.0330 days Tj = 3.134486 +/- 0.0181 Shower association: IAU No. = 9 IAU code = DRA Orbit covariance matrix: e , q (AU) , Tp (JD) , node (rad) , peri (rad) , i (rad) e , +1.219678e-05, -2.576189e-08, +4.699536e-05, -3.709062e-10, +4.644967e-07, +4.340473e-06 q , -2.576189e-08, +1.357080e-09, +1.035405e-06, +2.578569e-13, +2.383538e-08, -2.972004e-09 Tp , +4.699536e-05, +1.035405e-06, +1.169426e-03, -1.887139e-09, +2.340603e-05, +2.212364e-05 node, -3.709062e-10, +2.578569e-13, -1.887139e-09, +1.167327e-14, -2.414204e-11, -1.366393e-10 peri, +4.644967e-07, +2.383538e-08, +2.340603e-05, -2.414204e-11, +4.904620e-07, +2.833866e-07 i , +4.340473e-06, -2.972004e-09, +2.212364e-05, -1.366393e-10, +2.833866e-07, +1.599413e-06 Jacchia fit on lag = -|a1|*exp(|a2|*t): a1 = 1.381332 a2 = 7.347168 Mean time residuals from time vs. length: Station with reference time: 2 Avg. res. = 7.181e-05 s Stddev = 8.47e-03 s Begin point on the trajectory: Lon = -81.378896 +/- 0.0000 deg Lat = 43.554828 +/- 0.0001 deg Ht = 100289.36 +/- 22.60 m End point on the trajectory: Lon = -81.315348 +/- 0.0002 deg Lat = 43.512601 +/- 0.0001 deg Ht = 84289.98 +/- 32.44 m Stations -------- ID, Ignored, Lon +E (deg), Lat +N (deg), Ht (m), Jacchia a1, Jacchia a2, Beg Ht (m), End Ht (m), +/- Obs ang (deg), +/- V (m), +/- H (m), Persp. angle (deg), Weight, FOV Beg, FOV End 2, False, -81.315700, 43.192800, 320.00, 38.883160, 0.000000, 100289.36, 89433.18, 0.001469, 1.48, 2.03, 15.71, 1.0000, None, None 1, False, -80.772100, 43.264200, 330.00, 1.157258, 7.576505, 97949.98, 84289.98, 0.004590, 6.72, 4.39, 7.67, 1.0000, None, None Points ------ No, Station ID, Ignore, Time (s), JD, meas1, meas2, Azim +E of due N (deg), Alt (deg), Azim line (deg), Alt line (deg), RA obs (deg), Dec obs (deg), RA line (deg), Dec line (deg), X (m), Y (m), Z (m), Latitude (deg), Longitude (deg), Height (m), Range (m), Length (m), State vect dist (m), Lag (m), Vel (m/s), Vel prev avg (m/s), H res (m), V res (m), Ang res (asec), AppMag, AbsMag 0, 2, 0, 0.000000, 2458400.504594907630, 172.76500, 22.41700, 352.76500, 67.58300, 352.76520, 67.58336, 291.30435, +65.30446, 291.30472, +65.30412, 2196160.98, -4158003.56, 4441457.81, 43.554828, -81.378896, 100289.36, 107999.29, 0.00, 5.42, -445.30, 0.00, 25229.38, 0.57, 0.41, 1.34, None, None 1, 2, 0, 0.031000, 2458400.504595266655, 173.22400, 22.45600, 353.22400, 67.54400, 353.22446, 67.54482, 291.69468, +65.37990, 291.69562, +65.37914, 2196228.21, -4157311.46, 4440448.39, 43.551890, -81.374362, 99173.08, 106824.02, 1225.75, 1220.33, 94.57, 39540.41, 25229.38, 1.26, 0.91, 3.00, None, None 2, 2, 0, 0.062000, 2458400.504595625214, 173.43400, 22.47500, 353.43400, 67.52500, 353.43440, 67.52571, 291.87412, +65.41483, 291.87508, +65.41416, 2196259.66, -4156987.61, 4439976.06, 43.550515, -81.372309, 98650.75, 106274.69, 1799.30, 1793.88, -6.93, 18501.62, 25229.38, 1.09, 0.79, 2.61, None, None 3, 2, 0, 0.093000, 2458400.504595984239, 173.66400, 22.49400, 353.66400, 67.50600, 353.66324, 67.50468, 292.07253, +65.45078, 292.07162, +65.45202, 2196293.48, -4156639.48, 4439468.33, 43.549036, -81.370092, 98089.26, 105684.38, 2415.85, 2410.43, -65.42, 19888.71, 25229.38, -2.01, -1.46, 4.86, None, None 4, 2, 0, 0.125000, 2458400.504596354440, 173.94700, 22.52200, 353.94700, 67.47800, 353.94727, 67.47845, 292.31601, +65.49881, 292.31698, +65.49838, 2196334.61, -4156216.06, 4438850.77, 43.547237, -81.367372, 97406.35, 104966.68, 3165.75, 3160.33, -12.34, 23434.34, 24100.56, 0.69, 0.50, 1.68, None, None 5, 2, 0, 0.156000, 2458400.504596712999, 174.18300, 22.54400, 354.18300, 67.45600, 354.18299, 67.45598, 292.52095, +65.53689, 292.52158, +65.53691, 2196368.70, -4155865.09, 4438338.90, 43.545746, -81.365135, 96840.29, 104372.14, 3787.33, 3781.91, -65.81, 20050.86, 23209.12, -0.03, -0.02, 0.08, None, None 6, 2, 0, 0.187000, 2458400.504597072024, 174.47200, 22.57200, 354.47200, 67.42800, 354.47217, 67.42828, 292.77303, +65.58377, 292.77408, +65.58351, 2196409.66, -4155443.48, 4437723.98, 43.543954, -81.362422, 96160.29, 103658.21, 4534.03, 4528.61, 5.85, 24087.18, 22985.17, 0.42, 0.31, 1.04, None, None 7, 2, 0, 0.218000, 2458400.504597430583, 174.73300, 22.59700, 354.73300, 67.40300, 354.73276, 67.40262, 293.00229, +65.62507, 293.00283, +65.62543, 2196446.39, -4155065.39, 4437172.54, 43.542347, -81.360001, 95550.49, 103018.36, 5203.64, 5198.22, 0.42, 21600.43, 22777.25, -0.57, -0.42, 1.42, None, None 8, 2, 0, 0.249000, 2458400.504597789608, 175.00200, 22.62300, 355.00200, 67.37700, 355.00119, 67.37572, 293.23995, +65.66710, 293.23976, +65.66831, 2196483.79, -4154680.31, 4436610.92, 43.540710, -81.357534, 94929.43, 102367.03, 5885.63, 5880.21, 7.36, 21999.49, 22628.55, -1.90, -1.38, 4.74, None, None 9, 2, 0, 0.280000, 2458400.504598148167, 175.27600, 22.65200, 355.27600, 67.34800, 355.27581, 67.34770, 293.48265, +65.71159, 293.48354, +65.71188, 2196521.63, -4154290.75, 4436042.75, 43.539053, -81.355035, 94301.15, 101708.47, 6575.56, 6570.14, 22.25, 22255.79, 22532.48, -0.44, -0.32, 1.10, None, None 10, 2, 0, 0.311000, 2458400.504598507192, 175.55700, 22.68200, 355.55700, 67.31800, 355.55730, 67.31846, 293.73314, +65.75664, 293.73487, +65.75621, 2196559.99, -4153895.94, 4435466.92, 43.537373, -81.352501, 93664.39, 101041.39, 7274.79, 7269.37, 46.44, 22555.92, 22481.03, 0.67, 0.49, 1.70, None, None 11, 2, 0, 0.342000, 2458400.504598865751, 175.81100, 22.70900, 355.81100, 67.29100, 355.81125, 67.29138, 293.96105, +65.79651, 293.96284, +65.79614, 2196594.45, -4153541.18, 4434949.52, 43.535864, -81.350237, 93092.23, 100442.35, 7903.08, 7897.66, -0.32, 20267.46, 22366.60, 0.55, 0.40, 1.41, None, None 12, 2, 0, 0.373000, 2458400.504599224776, 176.08300, 22.73700, 356.08300, 67.26300, 356.08237, 67.26207, 294.20690, +65.83750, 294.20759, +65.83839, 2196630.76, -4153167.32, 4434404.26, 43.534273, -81.347844, 92489.27, 99811.38, 8565.20, 8559.78, -13.25, 21358.58, 22264.27, -1.35, -0.98, 3.46, None, None 13, 2, 0, 0.405000, 2458400.504599594977, 176.36600, 22.76900, 356.36600, 67.23100, 356.36590, 67.23086, 294.46349, +65.88212, 294.46506, +65.88226, 2196668.34, -4152780.44, 4433839.99, 43.532626, -81.345366, 91865.31, 99158.80, 9250.38, 9244.97, -24.88, 21412.07, 22174.58, -0.20, -0.14, 0.51, None, None 14, 2, 0, 0.436000, 2458400.504599954002, 176.62800, 22.79800, 356.62800, 67.20200, 356.62759, 67.20142, 294.70276, +65.92202, 294.70405, +65.92258, 2196702.80, -4152425.78, 4433322.72, 43.531116, -81.343102, 91293.31, 98560.92, 9878.51, 9873.09, -71.80, 20262.13, 22068.75, -0.83, -0.60, 2.15, None, None 15, 2, 0, 0.467000, 2458400.504600312561, 176.91300, 22.83000, 356.91300, 67.17000, 356.91228, 67.16899, 294.96456, +65.96499, 294.96558, +65.96597, 2196739.75, -4152045.38, 4432767.92, 43.529496, -81.340663, 90679.81, 97920.01, 10552.22, 10546.80, -73.14, 21732.39, 21990.65, -1.45, -1.05, 3.77, None, None 16, 2, 0, 0.498000, 2458400.504600671586, 177.19100, 22.86100, 357.19100, 67.13900, 357.18938, 67.13678, 295.22162, +66.00580, 295.22168, +66.00796, 2196775.42, -4151678.10, 4432232.25, 43.527931, -81.338313, 90087.47, 97301.59, 11202.68, 11197.26, -97.71, 20982.80, 21917.41, -3.18, -2.31, 8.32, None, None 17, 2, 0, 0.529000, 2458400.504601030145, 177.50400, 22.89500, 357.50400, 67.10500, 357.50042, 67.10017, 295.51314, +66.04979, 295.51100, +66.05450, 2196814.83, -4151272.40, 4431640.55, 43.526203, -81.335703, 89433.18, 96618.90, 11921.19, 11915.77, -54.25, 23177.62, 21888.03, -6.86, -4.98, 18.09, None, None 0, 1, 0, 0.122798, 2458400.504596422426, 123.34700, 31.08500, 303.34700, 58.91500, 303.34848, 58.91460, 253.30303, +52.52552, 253.30290, +52.52628, 2196301.87, -4156553.14, 4439342.40, 43.548669, -81.369668, 97949.98, 113679.02, 0.00, 2563.35, -561.37, 0.00, 26739.54, -0.93, -1.43, 3.10, None, None 1, 1, 0, 0.215798, 2458400.504597498570, 123.20100, 31.23000, 303.20100, 58.77000, 303.19934, 58.77044, 253.06755, +52.44698, 253.06925, +52.44613, 2196429.18, -4155242.48, 4437430.83, 43.543100, -81.361220, 95836.09, 111389.83, 2321.24, 4884.59, -265.26, 24959.53, 26739.54, 1.03, 1.58, 3.48, None, None 2, 1, 0, 0.246798, 2458400.504597857594, 123.12600, 31.29800, 303.12600, 58.70200, 303.12893, 58.70122, 252.95766, +52.40637, 252.95738, +52.40787, 2196489.92, -4154617.20, 4436518.88, 43.540441, -81.357133, 94827.67, 110296.09, 3428.63, 5991.98, 167.08, 35722.25, 26739.54, -1.80, -2.76, 6.17, None, None 3, 1, 0, 0.277798, 2458400.504598216154, 123.08300, 31.34200, 303.08300, 58.65800, 303.08415, 58.65769, 252.88657, +52.38284, 252.88724, +52.38342, 2196526.10, -4154244.80, 4435975.74, 43.538857, -81.354750, 94227.05, 109646.59, 4088.17, 6651.52, 151.58, 21275.49, 26739.54, -0.70, -1.07, 2.41, None, None 4, 1, 0, 0.308798, 2458400.504598575179, 123.04000, 31.38400, 303.04000, 58.61600, 303.04100, 58.61573, 252.81886, +52.35926, 252.81972, +52.35977, 2196560.39, -4153891.82, 4435460.92, 43.537356, -81.352498, 93657.76, 109031.28, 4713.31, 7276.66, 101.68, 20165.88, 25888.75, -0.61, -0.93, 2.10, None, None 5, 1, 0, 0.340798, 2458400.504598945379, 122.99900, 31.42800, 302.99900, 58.57200, 302.99674, 58.57260, 252.74792, +52.33658, 252.75043, +52.33542, 2196595.17, -4153533.78, 4434938.72, 43.535832, -81.350216, 93080.30, 108407.29, 5347.42, 7910.77, 38.97, 19815.91, 24944.55, 1.37, 2.10, 4.77, None, None 6, 1, 0, 0.371798, 2458400.504599304404, 122.95100, 31.47700, 302.95100, 58.52300, 302.94728, 58.52399, 252.66910, +52.30998, 252.67242, +52.30807, 2196634.40, -4153129.84, 4434349.58, 43.534113, -81.347619, 92428.83, 107702.65, 6062.82, 8626.17, 79.32, 23077.49, 24362.81, 2.24, 3.44, 7.86, None, None 7, 1, 0, 0.402798, 2458400.504599662963, 122.90900, 31.51900, 302.90900, 58.48100, 302.90458, 58.48218, 252.60167, +52.28664, 252.60544, +52.28437, 2196667.21, -4152792.11, 4433857.02, 43.532676, -81.345469, 91884.14, 107114.33, 6660.95, 9224.30, 2.40, 19294.36, 23750.96, 2.65, 4.06, 9.34, None, None 8, 1, 0, 0.433798, 2458400.504600021988, 122.86100, 31.56300, 302.86100, 58.43700, 302.85918, 58.43749, 252.53125, +52.25999, 252.53395, +52.25906, 2196702.06, -4152433.32, 4433333.73, 43.531148, -81.343177, 91305.48, 106489.12, 7296.38, 9859.73, -37.21, 20497.80, 23250.59, 1.09, 1.67, 3.86, None, None 9, 1, 0, 0.464798, 2458400.504600380547, 122.80800, 31.61400, 302.80800, 58.38600, 302.80743, 58.38615, 252.44969, +52.23036, 252.45193, +52.23007, 2196742.06, -4152021.61, 4432733.25, 43.529395, -81.340527, 90641.49, 105771.09, 8025.54, 10588.89, 16.92, 23521.50, 22979.84, 0.34, 0.52, 1.20, None, None 10, 1, 0, 0.495798, 2458400.504600739572, 122.75400, 31.66200, 302.75400, 58.33800, 302.75790, 58.33696, 252.37321, +52.20019, 252.37348, +52.20220, 2196779.67, -4151634.39, 4432168.50, 43.527745, -81.338042, 90017.00, 105096.16, 8711.32, 11274.67, 27.65, 22121.93, 22786.73, -2.31, -3.53, 8.28, None, None 11, 1, 0, 0.526798, 2458400.504601098131, 122.71000, 31.70800, 302.71000, 58.29200, 302.71206, 58.29145, 252.29977, +52.17523, 252.30103, +52.17629, 2196813.74, -4151283.69, 4431657.02, 43.526251, -81.335803, 89451.40, 104485.38, 9332.42, 11895.77, -26.30, 20035.42, 22576.16, -1.21, -1.86, 4.38, None, None 12, 1, 0, 0.557798, 2458400.504601457156, 122.66300, 31.76100, 302.66300, 58.23900, 302.66034, 58.23971, 252.21516, +52.14828, 252.21878, +52.14691, 2196852.39, -4150885.78, 4431076.67, 43.524555, -81.333246, 88809.67, 103791.86, 10037.15, 12600.50, 3.39, 22733.16, 22447.04, 1.56, 2.38, 5.65, None, None 13, 1, 0, 0.588798, 2458400.504601815715, 122.61700, 31.80800, 302.61700, 58.19200, 302.61352, 58.19293, 252.14041, +52.12200, 252.14454, +52.12021, 2196886.52, -4150534.36, 4430564.13, 43.523057, -81.331001, 88242.91, 103179.99, 10659.52, 13222.87, -49.28, 20076.55, 22301.63, 2.03, 3.10, 7.40, None, None 14, 1, 0, 0.620798, 2458400.504602186382, 122.57500, 31.84800, 302.57500, 58.15200, 302.57289, 58.15256, 252.07700, +52.09804, 252.08062, +52.09695, 2196915.04, -4150240.82, 4430136.01, 43.521806, -81.329152, 87769.46, 102669.85, 11179.39, 13742.74, -226.23, 16245.92, 22060.88, 1.22, 1.87, 4.49, None, None 15, 1, 0, 0.651798, 2458400.504602544941, 122.52300, 31.90200, 302.52300, 58.09800, 302.51970, 58.09888, 251.99135, +52.06804, 251.99567, +52.06634, 2196953.71, -4149842.68, 4429555.33, 43.520108, -81.326592, 87127.37, 101976.21, 11884.52, 14447.87, -196.15, 22745.93, 21909.89, 1.90, 2.91, 7.04, None, None 16, 1, 0, 0.682798, 2458400.504602903966, 122.48000, 31.94700, 302.48000, 58.05300, 302.47528, 58.05426, 251.92008, +52.04311, 251.92521, +52.04068, 2196984.85, -4149522.11, 4429087.78, 43.518741, -81.324555, 86610.34, 101418.66, 12452.27, 15015.62, -303.45, 18314.52, 21738.60, 2.71, 4.14, 10.07, None, None 17, 1, 0, 0.713798, 2458400.504603262525, 122.43600, 31.99500, 302.43600, 58.00500, 302.42847, 58.00700, 251.84409, +52.01740, 251.85069, +52.01352, 2197017.61, -4149184.91, 4428595.99, 43.517302, -81.322406, 86066.51, 100832.04, 13049.46, 15612.81, -381.30, 19264.29, 21575.68, 4.30, 6.58, 16.08, None, None 18, 1, 0, 0.744798, 2458400.504603621550, 122.38200, 32.06600, 302.38200, 57.93400, 302.36235, 57.93922, 251.73139, +51.98504, 251.74391, +51.97491, 2197065.27, -4148694.24, 4427880.35, 43.515209, -81.319219, 85275.26, 99976.51, 13918.46, 16481.81, -187.34, 28032.23, 21553.33, 11.13, 17.04, 41.99, None, None 19, 1, 0, 0.775798, 2458400.504603980109, 122.34500, 32.09600, 302.34500, 57.90400, 302.33075, 57.90779, 251.68451, +51.96377, 251.69460, +51.95642, 2197085.33, -4148487.78, 4427579.24, 43.514328, -81.317953, 84942.20, 99619.20, 14284.11, 16847.46, -496.74, 11795.14, 21404.86, 8.05, 12.32, 30.47, None, None 20, 1, 0, 0.806798, 2458400.504604339134, 122.29600, 32.15600, 302.29600, 57.84400, 302.27419, 57.84979, 251.58970, +51.93438, 251.60356, +51.92312, 2197124.61, -4148083.35, 4426989.38, 43.512601, -81.315348, 84289.98, 98915.03, 15000.37, 17563.72, -455.52, 23105.28, 21314.71, 12.24, 18.75, 46.69, None, None Notes ----- - Points that have not been taken into consideration when computing the trajectory have '1' in the 'Ignore' column. - The time already has time offsets applied to it. - 'meas1' and 'meas2' are given input points. - X, Y, Z are ECI (Earth-Centered Inertial) positions of projected lines of sight on the radiant line. - Zc is the observed zenith distance of the entry angle, while the Zg is the entry zenith distance corrected for Earth's gravity. - Latitude (deg) and Longitude (deg) are in WGS84 coordinates, while Height (m) is in the EGM96 datum. There values are coordinates of each point on the radiant line. - Jacchia (1955) deceleration equation fit was done on the lag. - Right ascension and declination in the table are given in the epoch of date for the corresponding JD, per every point. - 'RA and Dec obs' are the right ascension and declination calculated from the observed values, while the 'RA and Dec line' are coordinates of the lines of sight projected on the fitted radiant line. The coordinates are in the epoch of date, and NOT J2000!. 'Azim and alt line' are thus corresponding azimuthal coordinates. - 'Vel prev avg' is the average velocity including all previous points up to the given point. For the first 4 points this velocity is computed as the average velocity of those 4 points.