Orbital Analysis for matched events on 20210816_013745.357_UK

Summary for Event
-----------------
shower ID 7 PER
Lg 64.48° Bg 36.67° Vg 33.71km/s
mass 0.35814g, abs. mag -2.4
Path Details
------------
start -4.04° 50.67° 61.58km
end   -4.31° 50.55° 31.39km

Orbit Details
-------------
Semimajor axis 0.68A.U., eccentricity 0.54, inclination 81.80°, Period 0.56Y, LA Sun 143.14°, last Perihelion 2021-05-25

Full details below
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Input measurement type: Azimuth +east of due north for meas1, Elevation angle above the horizon for meas2

Uncertainties type:
 Purely geometric uncertainties

Reference JD: 2459442.567886077799
Time: 2021-08-16 01:37:45.397637 UTC


Plane intersections
-------------------
Intersection 1 - Stations: UK001K and UK0024
 Convergence angle = 42.69562 deg
 R.A. =  50.20804  Dec = +56.79691 deg

Best intersection: Stations UK001K and UK0024 with Qconv = 42.70 deg


Least squares solution
----------------------
State vector (ECI, epoch of date):
 X =   3951644.84 +/- 19.14 m
 Y =  -1053086.55 +/- 23.75 m
 Z =   4959160.87 +/- 20.15 m
 Vx =    12475.95 +/- 57.33 m/s
 Vy =    14696.53 +/- 41.84 m/s
 Vz =    29808.66 +/- 13.09 m/s

State vector covariance matrix (X, Y, Z, Vx, Vy, Vz):
+3.925704e+02, -2.232839e+02, +2.238172e+02, +9.169565e+02, -7.244490e+02, -2.146443e+01
-2.232839e+02, +6.040192e+02, -1.023762e+02, -4.495510e+02, +7.466234e+02, -1.833998e+02
+2.238172e+02, -1.023762e+02, +4.351326e+02, +7.319588e+01, -3.511594e+02, +1.435199e+02
+9.169565e+02, -4.495510e+02, +7.319588e+01, +3.522944e+03, -2.148235e+03, -3.978615e+02
-7.244490e+02, +7.466234e+02, -3.511594e+02, -2.148235e+03, +1.875321e+03, -3.738267e+01
-2.146443e+01, -1.833998e+02, +1.435199e+02, -3.978615e+02, -3.738267e+01, +1.836038e+02

Timing offsets (from input data):
    UK001K: -0.000039 s
    UK0024: 0.000000 s

Reference point on the trajectory:
  Time: 2021-08-16 01:37:45.397637 UTC
  Lon     = +-4.035194 +/- 0.0003 deg
  Lat     = +50.676344 +/- 0.0001 deg
  Lat geo = +50.489396 +/- 0.0001 deg
  Ht      =   62454.09 +/- 25.68 m

  JD dynamic   = 2459442.568687287625 
  LST apparent = 345.0778613208 deg
Radiant (apparent in ECI which includes Earth's rotation, epoch of date):
  R.A.      =  49.67191 +/- 0.2024 deg
  Dec       = +57.10839 +/- 0.0390 deg
  Azimuth   =  54.34611 +/- 0.0956 deg
  Elevation = +52.86507 +/- 0.1009 deg
  Vavg      =  36.67003 +/- 0.0156 km/s
  Vinit     =  35.49921 +/- 0.0000 km/s
Radiant (apparent ground-fixed, epoch of date):
  R.A.      =  50.04692 +/- 0.2024 deg
  Dec       = +56.74425 +/- 0.0390 deg
  Azimuth   =  54.80564 +/- 0.0956 deg
  Elevation = +52.55368 +/- 0.1009 deg
  Vavg      =  36.81726 +/- 0.0156 km/s
  Vinit     =  35.64644 +/- 0.0000 km/s
Radiant (geocentric, J2000):
  R.A.   =  50.98505 +/- 0.2062 deg
  Dec    = +56.70741 +/- 0.0392 deg
  Vg     =  33.70719 +/- 0.0000 km/s
  Vinf   =  35.49921 +/- 0.0000 km/s
  Zc     =  37.24416 +/- 0.1011 deg
  Zg     =  38.24398 +/- 0.1040 deg
Radiant (ecliptic geocentric, J2000):
  Lg     =  64.47877 +/- 0.1384 deg
  Bg     = +36.67484 +/- 0.0447 deg
  Vh     =  20.94232 +/- 0.0199 km/s
Radiant (ecliptic heliocentric, J2000):
  Lh     = 173.33583 +/- 0.2980 deg
  Bh     = +74.01404 +/- 0.1645 deg
  Vh_x   =   5.72858 +/- 0.0560 km/s
  Vh_y   =  -0.66932 +/- 0.0370 km/s
  Vh_z   = -20.13247 +/- 0.0211 km/s
Orbit:
  La Sun = 143.135452 +/- 0.0000 deg
  a      =   0.675398 +/- 0.0004 AU
  e      =   0.540246 +/- 0.0012
  i      =  81.800144 +/- 0.0355 deg
  peri   =  12.364602 +/- 0.1437 deg
  node   = 143.137127 +/- 0.0000 deg
  Pi     = 155.501730 +/- 0.1437 deg
  q      =   0.310517 +/- 0.0009 AU
  f      = 167.632025 +/- 0.1437 deg
  M      = 145.752201 +/- 0.4294 deg
  Q      =   1.040279 +/- 0.0007 AU
  n      =   1.775681 +/- 0.0017 deg/day
  T      =   0.555060 +/- 0.0005 years
  Last perihelion JD = 2459360.486200 (2021-05-25 23:40:07.669070) +/- 0.2263 days
  Tj     =   7.791959 +/- 0.0045
Shower association:
  IAU No.  =    7
  IAU code =  PER

Orbit covariance matrix:
             e     ,     q (AU)   ,      Tp (JD) ,   node (rad) ,   peri (rad) ,    i (rad)
e   , +1.467887e-06, -1.116464e-06, +2.395591e-04, -1.310775e-11, +1.537712e-06, +2.203609e-07
q   , -1.116464e-06, +8.802547e-07, -1.600647e-04, +1.642241e-11, -7.702938e-07, -2.761936e-07
Tp  , +2.395591e-04, -1.600647e-04, +5.487310e-02, +2.457894e-09, +5.354427e-04, -4.139817e-05
node, -1.310775e-11, +1.642241e-11, +2.457894e-09, +1.456762e-15, +6.916555e-11, -2.451264e-11
peri, +1.537712e-06, -7.702938e-07, +5.354427e-04, +6.916555e-11, +6.740737e-06, -1.164171e-06
i   , +2.203609e-07, -2.761936e-07, -4.139817e-05, -2.451264e-11, -1.164171e-06, +4.124734e-07

Jacchia fit on lag = -|a1|*exp(|a2|*t):
 a1 = 0.000000
 a2 = 0.000000

Mean time residuals from time vs. length:
  Station with reference time: UK0024
  Avg. res. = 7.217e-05 s
  Stddev    = 8.50e-03 s

Begin point on the trajectory:
  Lon =    -4.042740 +/- 0.0003 deg
  Lat =    50.672904 +/- 0.0001 deg
  Ht  = 61578.85 +/- 16.45 m
End point on the trajectory:
  Lon =    -4.308175 +/- 0.0004 deg
  Lat =    50.553233 +/- 0.0005 deg
  Ht  = 31390.70 +/- 16.31 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, Comment
    UK001K,   False,    -3.557111,    51.483925,   37.50,   0.000000,   0.000000,    51918.32,    31390.70,          0.008450,     17.35,      0.15,              89.08, 1.0000,    True,    True, {"ff_name": "FF_UK001K_20210816_013737_727_0482560.fits"}
    UK0024,   False,    -2.949770,    50.877440,   82.00,   0.000000,   0.000000,    61578.85,    47405.25,          0.014814,     19.55,     17.67,              87.85, 1.0000,    True,    True, {"ff_name": "FF_UK0024_20210816_013739_518_0493824.fits"}

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,     UK001K,       1,  0.372428, 2459442.567890388891, 324.97513,  -9.03080,              202.91742,  26.93302,       202.91885,       26.93345,    324.97513,      -9.03080,     324.97555,       -9.03007,  3947491.85, -1057978.72,  4949238.19,      50.639244,       -4.117848,   53036.68,  115199.14,       0.00,            11816.94,    42.82,      0.00,           38541.13,     -0.03,     -2.70,           4.84,  +2.97,  +2.66
  1,     UK001K,       0,  0.413020, 2459442.567890858743, 324.59407,  -9.61876,              203.16252,  26.27040,       203.17286,       26.27351,    324.59407,      -9.61876,     324.58748,       -9.61345,  3946998.47, -1058559.92,  4948059.35,      50.634826,       -4.127679,   51918.32,  115327.14,    1403.89,            13220.83,  -110.74,  34585.26,           38541.13,     -0.19,    -19.68,          35.20,  +1.65,  +1.34
  2,     UK001K,       0,  0.453720, 2459442.567891329993, 324.11609, -10.30695,              203.47766,  25.48629,       203.47147,       25.48443,    324.11609,     -10.30695,     324.12300,      -10.31015,  3946407.26, -1059256.35,  4946646.80,      50.629528,       -4.139429,   50578.40,  115502.19,    3086.10,            14903.04,    10.16,  41332.00,           38541.13,      0.11,     11.87,          21.19,  +1.27,  +0.96
  3,     UK001K,       0,  0.494384, 2459442.567891800310, 323.68827, -10.96248,              203.74310,  24.74551,       203.74725,       24.74675,    323.68827,     -10.96248,     323.68695,      -10.96032,  3945853.30, -1059908.91,  4945323.21,      50.624561,       -4.150451,   49322.98,  115688.57,    4662.36,            16479.31,    26.57,  38763.20,           38541.13,     -0.07,     -8.01,          14.28,  +0.73,  +0.41
  4,     UK001K,       0,  0.535052, 2459442.567892271094, 323.23177, -11.61415,              204.03406,  24.00063,       204.02373,       23.99754,    323.23177,     -11.61415,     323.24250,      -11.61959,  3945289.09, -1060573.54,  4943975.16,      50.619499,       -4.161676,   48044.51,  115900.22,    6267.76,            18084.70,    72.10,  39475.60,           38843.30,      0.18,     20.09,          35.75,  +0.26,  -0.06
  5,     UK001K,       0,  0.575684, 2459442.567892741412, 322.81495, -12.23778,              204.28655,  23.29229,       204.28171,       23.29085,    322.81495,     -12.23778,     322.82135,      -12.24035,  3944755.30, -1061202.34,  4942699.78,      50.614707,       -4.172306,   46835.06,  116120.91,    7786.61,            19603.55,    32.53,  37380.68,           38720.81,      0.08,      9.47,          16.82,  +0.02,  -0.30
  6,     UK001K,       0,  0.616288, 2459442.567893211264, 322.41879, -12.83249,              204.52143,  22.61669,       204.52499,       22.61775,    322.41879,     -12.83249,     322.41841,      -12.83059,  3944245.24, -1061803.18,  4941481.10,      50.610126,       -4.182473,   45679.47,  116350.26,    9237.94,            21054.88,   -73.43,  35743.51,           38358.53,     -0.06,     -7.02,          12.44,  -0.34,  -0.67
  7,     UK001K,       0,  0.656972, 2459442.567893682048, 321.95939, -13.50189,              204.79421,  21.85221,       204.79754,       21.85320,    321.95939,     -13.50189,     321.95935,      -13.50010,  3943663.55, -1062488.41,  4940091.28,      50.604898,       -4.194047,   44361.77,  116632.86,   10893.08,            22710.03,    21.68,  40682.89,           38401.33,     -0.06,     -6.60,          11.67,  -0.53,  -0.86
  8,     UK001K,       0,  0.697672, 2459442.567894153297, 321.47813, -14.18381,              205.07946,  21.06932,       205.07418,       21.06775,    321.47813,     -14.18381,     321.48548,      -14.18667,  3943063.22, -1063195.59,  4938656.92,      50.599499,       -4.205988,   43001.99,  116948.40,   12601.27,            24418.21,   169.42,  41970.14,           38659.54,      0.09,     10.55,          18.61,  -0.81,  -1.15
  9,     UK001K,       1,  0.738280, 2459442.567894623149, 321.03583, -14.76080,              205.35082,  20.39708,       205.31261,       20.38567,    321.03583,     -14.76080,     321.07127,      -14.78163,  3942539.54, -1063812.48,  4937405.68,      50.594787,       -4.216427,   41815.91,  117244.00,   14091.37,            25908.31,   102.47,  36694.77,           38683.90,      0.61,     76.92,         135.32,  -1.15,  -1.50
 10,     UK001K,       0,  0.778980, 2459442.567895094398, 320.57711, -15.45071,              205.59991,  19.61138,       205.58168,       19.60594,    320.57711,     -15.45071,     320.59591,      -15.46073,  3941937.71, -1064521.43,  4935967.74,      50.589368,       -4.228402,   40453.02,  117605.61,   15803.81,            27620.75,   254.77,  42074.77,           38851.51,      0.30,     36.98,          64.86,  -1.20,  -1.55
 11,     UK001K,       0,  0.819612, 2459442.567895564716, 320.17441, -16.07875,              205.80723,  18.89981,       205.82199,       18.90422,    320.17441,     -16.07875,     320.16519,      -16.07059,  3941393.14, -1065162.93,  4934666.60,      50.584462,       -4.239255,   39219.90,  117953.88,   17353.35,            29170.29,   246.70,  38135.80,           38920.68,     -0.26,    -30.14,          52.70,  -1.37,  -1.73
 12,     UK001K,       0,  0.860280, 2459442.567896035500, 319.70318, -16.72059,              206.07216,  18.15603,       206.07521,       18.15694,    319.70318,     -16.72059,     319.70415,      -16.71889,  3940809.77, -1065850.13,  4933272.76,      50.579203,       -4.250872,   37899.08,  118348.16,   19013.27,            30830.22,   347.91,  40816.56,           39025.00,     -0.05,     -6.27,          10.93,  -1.51,  -1.88
 13,     UK001K,       0,  0.900932, 2459442.567896505818, 319.23365, -17.34774,              206.33430,  17.42627,       206.32189,       17.42258,    319.23365,     -17.34774,     319.24816,      -17.35470,  3940232.82, -1066529.77,  4931894.27,      50.573999,       -4.262365,   36592.94,  118759.85,   20654.92,            32471.87,   431.57,  40382.99,           39129.38,      0.21,     25.70,          44.64,  -1.35,  -1.72
 14,     UK001K,       0,  0.941572, 2459442.567896976136, 318.80052, -17.97124,              206.55751,  16.70964,       206.55933,       16.71019,    318.80052,     -17.97124,     318.80286,      -17.97020,  3939669.43, -1067193.43,  4930548.16,      50.568914,       -4.273593,   35317.61,  119182.59,   22258.00,            34074.94,   477.21,  39445.73,           39205.12,     -0.03,     -3.81,           6.60,  -1.11,  -1.49
 15,     UK001K,       0,  0.982196, 2459442.567897446454, 318.35838, -18.57385,              206.79077,  16.01013,       206.79090,       16.01017,    318.35838,     -18.57385,     318.36237,      -18.57378,  3939112.03, -1067850.05,  4929216.36,      50.563880,       -4.284707,   34055.96,  119620.72,   23844.04,            35660.98,   506.53,  39042.05,           39252.20,     -0.00,     -0.26,           0.45,  -1.43,  -1.82
 16,     UK001K,       0,  1.022772, 2459442.567897915840, 317.94987, -19.13033,              207.00206,  15.36380,       207.00342,       15.36421,    317.94987,     -19.13033,     317.95294,      -19.12955,  3938594.16, -1068460.09,  4927979.03,      50.559200,       -4.295045,   32883.89,  120045.61,   25317.59,            37134.53,   425.11,  36315.68,           39227.06,     -0.02,     -2.89,           4.96,  -0.08,  -0.48
 17,     UK001K,       0,  1.063496, 2459442.567898387555, 317.43808, -19.83705,              207.25791,  14.54456,       207.26870,       14.54778,    317.43808,     -19.83705,     317.43297,      -19.83082,  3937934.29, -1069237.41,  4926402.42,      50.553233,       -4.308175,   31390.70,  120609.75,   27195.17,            39012.12,   742.96,  46105.17,           39330.29,     -0.19,    -23.02,          39.37,  +1.73,  +1.32
  0,     UK0024,       1,  0.000000, 2459442.567886077799, 292.09040,  19.62094,              254.12640,  37.53496,       254.12900,       37.53455,    292.09040,     +19.62094,     292.08845,      +19.62195,  3951643.48, -1053088.15,  4959157.63,      50.676332,       -4.035052,   62451.01,  101550.89,       0.00,                3.86,   106.75,      0.00,           31745.98,      2.50,     -2.77,           7.58,  +2.85,  +2.82
  1,     UK0024,       0,  0.040500, 2459442.567886546720, 291.77982,  19.07403,              253.96661,  36.92768,       253.98009,       36.92554,    291.77982,     +19.07403,     291.76979,      +19.07931,  3951258.99, -1053541.08,  4958238.96,      50.672904,       -4.042740,   61578.85,  101516.55,    1094.04,             1097.90,  -119.90,  27013.43,           31745.98,     13.05,    -14.45,          39.56,  +1.82,  +1.79
  2,     UK0024,       0,  0.081172, 2459442.567887017503, 291.34979,  18.34739,              253.77739,  36.10867,       253.78277,       36.10781,    291.34979,     +18.34739,     291.34603,      +18.34951,  3950742.39, -1054149.62,  4957004.66,      50.668296,       -4.053014,   60407.12,  101486.02,    2563.97,             2567.83,    23.74,  36141.07,           31745.98,      5.26,     -5.82,          15.94,  +1.28,  +1.25
  3,     UK0024,       0,  0.121748, 2459442.567887486890, 290.98012,  17.73696,              253.63215,  35.41421,       253.61963,       35.41619,    290.98012,     +17.73696,     290.99022,      +17.73201,  3950306.15, -1054663.50,  4955962.37,      50.664403,       -4.061717,   59417.73,  101478.36,    3805.25,             3809.11,   -58.12,  30591.34,           31745.98,    -12.35,     13.66,          37.43,  +0.66,  +0.63
  4,     UK0024,       0,  0.162380, 2459442.567887957208, 290.57568,  17.05977,              253.47208,  34.64586,       253.44199,       34.65064,    290.57568,     +17.05977,     290.59957,      +17.04780,  3949823.18, -1055232.44,  4954808.41,      50.660091,       -4.071337,   58322.45,  101486.76,    5179.49,             5183.35,    -8.76,  33821.78,           32192.71,    -29.95,     33.12,          90.75,  +0.33,  +0.30
  5,     UK0024,       0,  0.203004, 2459442.567888427526, 290.21132,  16.35325,              253.25997,  33.87760,       253.26573,       33.87669,    290.21132,     +16.35325,     290.20769,      +16.35555,  3949334.88, -1055807.65,  4953641.72,      50.655729,       -4.081062,   57215.17,  101514.21,    6568.91,             6572.77,    56.29,  34201.81,           32607.46,      5.79,     -6.41,          17.55,  -0.02,  -0.05
  6,     UK0024,       0,  0.243612, 2459442.567888897378, 289.82824,  15.69959,              253.11080,  33.13776,       253.10096,       33.13932,    289.82824,     +15.69959,     289.83693,      +15.69564,  3948869.58, -1056355.76,  4952529.99,      50.651570,       -4.090338,   56160.14,  101558.64,    7892.87,             7896.73,    56.31,  32603.56,           32755.10,     -9.96,     11.02,          30.16,  -0.34,  -0.37
  7,     UK0024,       0,  0.284256, 2459442.567889367696, 289.44590,  14.98053,              252.91778,  32.34615,       252.92629,       32.34480,    289.44590,     +14.98053,     289.44040,      +14.98397,  3948367.65, -1056947.04,  4951330.72,      50.647082,       -4.100332,   55022.14,  101625.30,    9321.08,             9324.94,   159.60,  35139.45,           33015.50,      8.70,     -9.63,          26.35,  -0.62,  -0.66
  8,     UK0024,       0,  0.324904, 2459442.567889838479, 289.05405,  14.26285,              252.74033,  31.54856,       252.75387,       31.54642,    289.05405,     +14.26285,     289.04470,      +14.26835,  3947862.64, -1057541.93,  4950124.12,      50.642563,       -4.110389,   53877.27,  101712.68,   10758.03,            10761.89,   271.55,  35351.06,           33292.84,     13.97,    -15.47,          42.26,  -0.67,  -0.71
  9,     UK0024,       0,  0.365496, 2459442.567890307866, 288.70208,  13.60225,              252.57427,  30.81856,       252.59872,       30.81469,    288.70208,     +13.60225,     288.68418,      +13.61222,  3947399.25, -1058087.80,  4949016.94,      50.638415,       -4.119632,   52826.82,  101811.54,   12076.58,            12080.44,   266.98,  32482.90,           33389.83,     25.43,    -28.16,          76.86,  -0.86,  -0.90
 10,     UK0024,       0,  0.406092, 2459442.567890777718, 288.33198,  12.95561,              252.43883,  30.08763,       252.44667,       30.08639,    288.33198,     +12.95561,     288.32742,      +12.95882,  3946937.18, -1058632.11,  4947912.91,      50.634277,       -4.128851,   51779.45,  101927.20,   13391.36,            13395.22,   258.48,  32387.00,           33397.17,      8.23,     -9.11,          24.83,  -0.89,  -0.93
 11,     UK0024,       0,  0.446700, 2459442.567891248036, 287.97266,  12.27379,              252.27309,  29.33456,       252.29137,       29.33167,    287.97266,     +12.27379,     287.95984,      +12.28132,  3946457.19, -1059197.53,  4946766.08,      50.629975,       -4.138422,   50691.56,  102064.93,   14757.12,            14760.98,   300.77,  33632.86,           33410.46,     19.35,    -21.42,          58.32,  -1.25,  -1.29
 12,     UK0024,       1,  0.487356, 2459442.567891718354, 287.62013,  11.49978,              252.04145,  28.51177,       252.12239,       28.49899,    287.62013,     +11.49978,     287.55681,      +11.53326,  3945925.92, -1059823.36,  4945496.73,      50.625212,       -4.148999,   49487.57,  102237.54,   16268.80,            16272.66,   487.75,  37182.08,           33542.97,     86.35,    -95.77,         260.17,  -2.04,  -2.09
 13,     UK0024,       0,  0.528000, 2459442.567892189138, 287.20400,  10.81585,              251.93338,  27.72097,       251.96608,       27.71580,    287.20400,     +10.81585,     287.17965,      +10.82944,  3945424.72, -1060413.77,  4944299.22,      50.620716,       -4.158989,   48351.81,  102421.31,   17694.92,            17698.78,   589.20,  35088.18,           33670.43,     35.24,    -39.02,         105.88,  -0.89,  -0.94
 14,     UK0024,       0,  0.568532, 2459442.567892658059, 286.87136,  10.24098,              251.83032,  27.06595,       251.83836,       27.06468,    286.87136,     +10.24098,     286.86718,      +10.24433,  3945006.99, -1060905.85,  4943301.14,      50.616967,       -4.167344,   47405.25,  102591.12,   18883.54,            18887.40,   456.80,  29325.37,           33644.88,      8.72,     -9.65,          26.16,  +0.00,  -0.06

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.