Orbital Analysis for matched events on 20210810_223820.511_UK

Summary for Event
-----------------
shower ID 7 PER
Lg 58.93° Bg 36.80° Vg 60.51km/s
mass 0.15326g, abs. mag -2.3
Path Details
------------
start 2.99° 53.15° 107.39km
end   2.81° 53.03° 94.03km

Orbit Details
-------------
Semimajor axis 30.88A.U., eccentricity 0.97, inclination 116.68°, Period 171.63Y, LA Sun 138.21°, last Perihelion 2021-07-24

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: 2459437.443292959128
Time: 2021-08-10 22:38:20.515008 UTC


Plane intersections
-------------------
Intersection 1 - Stations: UK000Z and UK002K
 Convergence angle = 14.61548 deg
 R.A. =  43.09091  Dec = +55.49950 deg

Best intersection: Stations UK000Z and UK002K with Qconv = 14.62 deg


Least squares solution
----------------------
State vector (ECI, epoch of date):
 X =   2076945.15 +/- 241.08 m
 Y =  -3298387.39 +/- 54.14 m
 Z =   5166472.05 +/- 79.58 m
 Vx =    25249.14 +/- 1078.58 m/s
 Vy =    23704.02 +/- 422.77 m/s
 Vz =    50845.84 +/- 956.72 m/s

State vector covariance matrix (X, Y, Z, Vx, Vy, Vz):
+3.010058e+04, +5.413558e+03, +9.558734e+03, +9.402024e+04, +1.244326e+04, +2.288174e+04
+5.413558e+03, +1.496410e+03, +1.988154e+03, +1.436154e+04, +3.278507e+03, +2.989765e+03
+9.558734e+03, +1.988154e+03, +3.928889e+03, +3.257437e+04, +3.893201e+03, +7.343322e+03
+9.402024e+04, +1.436154e+04, +3.257437e+04, +5.846904e+05, +7.287679e+04, +1.312825e+05
+1.244326e+04, +3.278507e+03, +3.893201e+03, +7.287679e+04, +1.716130e+04, +1.640529e+04
+2.288174e+04, +2.989765e+03, +7.343322e+03, +1.312825e+05, +1.640529e+04, +3.336919e+04

Timing offsets (from input data):
    UK000Z: 0.000640 s
    UK002K: 0.000000 s
    UK0032: 0.000000 s

Reference point on the trajectory:
  Time: 2021-08-10 22:38:20.515008 UTC
  Lon     = ++2.989598 +/- 0.0034 deg
  Lat     = +53.149190 +/- 0.0004 deg
  Lat geo = +52.967394 +/- 0.0004 deg
  Ht      =  107372.67 +/- 113.30 m

  JD dynamic   = 2459437.444093738683 
  LST apparent = 302.1980068218 deg
Radiant (apparent in ECI which includes Earth's rotation, epoch of date):
  R.A.      =  43.19215 +/- 1.0063 deg
  Dec       = +55.74026 +/- 0.5529 deg
  Azimuth   =  43.53680 +/- 0.9807 deg
  Elevation = +36.65348 +/- 0.0917 deg
  Vavg      =  61.45218 +/- 0.7362 km/s
  Vinit     =  61.51991 +/- 0.7530 km/s
Radiant (apparent ground-fixed, epoch of date):
  R.A.      =  43.10319 +/- 1.0063 deg
  Dec       = +55.52601 +/- 0.5529 deg
  Azimuth   =  43.77506 +/- 0.9807 deg
  Elevation = +36.54466 +/- 0.0917 deg
  Vavg      =  61.60971 +/- 0.7362 km/s
  Vinit     =  61.67743 +/- 0.7530 km/s
Radiant (geocentric, J2000):
  R.A.   =  43.41404 +/- 1.0231 deg
  Dec    = +55.32815 +/- 0.5447 deg
  Vg     =  60.51052 +/- 0.7655 km/s
  Vinf   =  61.51991 +/- 0.7530 km/s
  Zc     =  53.47842 +/- 0.0926 deg
  Zg     =  53.95595 +/- 0.0992 deg
Radiant (ecliptic geocentric, J2000):
  Lg     =  58.92972 +/- 0.9188 deg
  Bg     = +36.80259 +/- 0.3061 deg
  Vh     =  41.49389 +/- 0.4658 km/s
Radiant (ecliptic heliocentric, J2000):
  Lh     =  73.78734 +/- 2.7034 deg
  Bh     = +60.88328 +/- 0.5663 deg
  Vh_x   =  -5.63726 +/- 1.0757 km/s
  Vh_y   = -19.38759 +/- 0.2985 km/s
  Vh_z   = -36.25032 +/- 0.2178 km/s
Orbit:
  La Sun = 138.214236 +/- nan deg
  a      =  30.883991 +/- 177.8445 AU
  e      =   0.968651 +/- 0.0421
  i      = 116.675147 +/- 1.0444 deg
  peri   = 155.354507 +/- 2.5757 deg
  node   = 138.212569 +/- 0.0001 deg
  Pi     = 293.567076 +/- 2.5756 deg
  q      =   0.968174 +/- 0.0084 AU
  f      =  24.641233 +/- 2.5757 deg
  M      =   0.100532 +/- nan deg
  Q      =  60.799809 +/- 355.6907 AU
  n      =   0.005743 +/- 0.0092 deg/day
  T      = 171.632992 +/- 405080634.8839 years
  Last perihelion JD = 2459419.937565 (2021-07-24 10:30:05.577761) +/- 1.3503 days
  Tj     =  -0.374854 +/- 0.2548
Shower association:
  IAU No.  =    7
  IAU code =  PER

Orbit covariance matrix:
             e     ,     q (AU)   ,      Tp (JD) ,   node (rad) ,   peri (rad) ,    i (rad)
e   , +6.293744e-04, +1.606120e-04, +3.380144e-02, -2.513298e-08, +8.175786e-04, +3.061961e-04
q   , +1.606120e-04, +4.398447e-05, +9.117469e-03, -6.771096e-09, +2.218139e-04, +8.256276e-05
Tp  , +3.380144e-02, +9.117469e-03, +1.897006e+00, -1.406215e-06, +4.609492e-02, +1.714127e-02
node, -2.513298e-08, -6.771096e-09, -1.406215e-06, +1.091248e-12, -3.416101e-08, -1.330638e-08
peri, +8.175786e-04, +2.218139e-04, +4.609492e-02, -3.416101e-08, +1.120579e-03, +4.164388e-04
i   , +3.061961e-04, +8.256276e-05, +1.714127e-02, -1.330638e-08, +4.164388e-04, +1.622616e-04

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: UK002K
  Avg. res. = 4.449e-06 s
  Stddev    = 2.11e-03 s

Begin point on the trajectory:
  Lon =     2.989889 +/- 0.0035 deg
  Lat =    53.149374 +/- 0.0002 deg
  Ht  = 107394.00 +/- 119.00 m
End point on the trajectory:
  Lon =     2.806362 +/- 0.0032 deg
  Lat =    53.033766 +/- 0.0003 deg
  Ht  = 94032.70 +/- 103.71 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
    UK000Z,   False,    -1.740490,    53.069201,  230.00,   9.355804,   0.000000,   107394.00,    94032.70,          0.008521,     43.80,     21.55,              43.88, 1.0000,    True,    True, {"ff_name": "FF_UK000Z_20210810_223818_370_0201216.fits"}
    UK002K,   False,    -0.382860,    53.537770,   34.00,   0.000000,   0.000000,   107352.66,    94224.64,          0.005666,     24.05,      4.98,              50.50, 1.0000,    True,    True, {"ff_name": "FF_UK002K_20210810_223814_648_0206080.fits"}
    UK0032,    True,    -0.023645,    52.984073,    6.00,   0.000000,   0.000000,   110525.45,    93852.86,          0.045662,       nan,       nan,              36.34, 0.0000,    True,    True, {"ff_name": "FF_UK0032_20210810_223815_065_0212224.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,     UK000Z,       0,  0.003951, 2459437.443292997777,  19.69573,  15.68696,               86.49759,  17.11926,        86.49550,       17.11614,     19.69573,     +15.68696,      19.69939,      +15.68576,  2076959.84, -3298373.61,  5166501.62,      53.149374,       +2.989889,  107394.00,  336968.02,       0.00,               35.77,  -182.82,      0.00,           62424.68,      9.62,     19.56,          13.34,  +2.74,  +0.10
  1,     UK000Z,       0,  0.044099, 2459437.443293462042,  19.57612,  15.35795,               86.80613,  16.93352,        86.80284,       16.92862,     19.57612,     +15.35795,      19.58201,      +15.35607,  2075752.83, -3299506.76,  5164070.99,      53.134253,       +2.965834,  105638.69,  334844.54,    2940.89,             2905.12,   216.63,  73251.31,           62424.68,     15.01,     30.51,          20.95,  +2.49,  -0.13
  2,     UK000Z,       0,  0.084199, 2459437.443293926306,  19.48750,  15.12561,               87.02708,  16.80474,        87.02077,       16.79535,     19.48750,     +15.12561,      19.49879,      +15.12201,  2074904.71, -3300302.97,  5162363.08,      53.123621,       +2.948884,  104405.80,  333356.76,    5007.34,             4971.57,  -183.87,  51532.33,           62424.68,     28.65,     58.25,          40.17,  +1.72,  -0.89
  3,     UK000Z,       0,  0.124347, 2459437.443294391036,  19.39942,  14.81527,               87.29798,  16.61440,        87.30305,       16.62193,     19.39942,     +14.81527,      19.39116,      +14.81816,  2073815.53, -3301325.51,  5160169.71,      53.109957,       +2.927167,  102823.08,  331458.34,    7661.16,             7625.39,     0.05,  66100.92,           62424.68,    -22.90,    -46.50,          32.26,  +1.09,  -1.51
  4,     UK000Z,       0,  0.164479, 2459437.443294855766,  19.30326,  14.52614,               87.56121,  16.44537,        87.56948,       16.45763,     19.30326,     +14.52614,      19.28966,      +14.53083,  2072796.95, -3302281.75,  5158118.54,      53.097169,       +2.906849,  101343.59,  329691.82,   10142.93,            10107.16,    12.90,  61840.21,           62312.61,    -37.13,    -75.38,          52.57,  +0.79,  -1.80
  5,     UK000Z,       0,  0.204595, 2459437.443295320030,  19.18239,  14.24482,               87.83870,  16.29717,        87.83576,       16.29282,     19.18239,     +14.24482,      19.18830,      +14.24315,  2071788.04, -3303228.92,  5156086.84,      53.084494,       +2.886726,   99878.72,  327951.19,   12601.16,            12565.38,     3.20,  61277.93,           62132.84,     13.09,     26.60,          18.65,  +0.71,  -1.87
  6,     UK000Z,       0,  0.244719, 2459437.443295784295,  19.08664,  13.96048,               88.09798,  16.13138,        88.09730,       16.13037,     19.08664,     +13.96048,      19.08883,      +13.96010,  2070805.77, -3304151.08,  5154108.76,      53.072144,       +2.867132,   98453.09,  326265.18,   14994.48,            14958.71,   -71.90,  59648.30,           61802.47,      3.03,      6.15,           4.33,  +0.70,  -1.87
  7,     UK000Z,       0,  0.284851, 2459437.443296248559,  18.97947,  13.66096,               88.37583,  15.96037,        88.37407,       15.95778,     18.97947,     +13.66096,      18.98367,      +13.65997,  2069775.41, -3305118.39,  5152033.86,      53.059180,       +2.846589,   96958.27,  324506.82,   17504.97,            17469.20,   -30.33,  62555.65,           61727.57,      7.71,     15.68,          11.11,  +0.34,  -2.22
  8,     UK000Z,       0,  0.324999, 2459437.443296713289,  18.87359,  13.33253,               88.67091,  15.76569,        88.67387,       15.77005,     18.87359,     +13.33253,      18.86987,      +13.33420,  2068669.76, -3306156.37,  5149807.36,      53.045259,       +2.824561,   95354.92,  322631.93,   20198.89,            20163.11,   193.68,  67099.67,           62050.95,    -12.96,    -26.33,          18.76,  +0.24,  -2.30
  9,     UK000Z,       0,  0.365103, 2459437.443297177553,  18.76004,  13.06710,               88.93138,  15.62502,        88.92342,       15.61333,     18.76004,     +13.06710,      18.77517,      +13.06263,  2067757.64, -3307012.68,  5147970.55,      53.033766,       +2.806362,   94032.70,  321092.16,   22421.30,            22385.52,   -51.10,  55416.16,           61853.89,     34.58,     70.33,          50.34,  +1.35,  -1.18
  0,     UK002K,       0,  0.000000, 2459437.443292959128,   6.89509,  13.65306,               99.54690,  23.92382,        99.54803,       23.92581,      6.89509,     +13.65306,       6.89302,      +13.65403,  2076931.42, -3298400.29,  5166444.38,      53.149018,       +2.989340,  107352.66,  254355.56,       0.00,               33.48,    57.95,      0.00,           61495.13,     -2.01,     -9.72,           8.05,  +2.39,  +0.36
  1,     UK002K,       0,  0.040244, 2459437.443293424789,   6.70870,  13.26271,               99.96208,  23.72136,        99.96631,       23.72881,      6.70870,     +13.26271,       6.70109,      +13.26633,  2075921.55, -3299348.36,  5164410.74,      53.136368,       +2.969186,  105884.00,  252787.77,    2460.56,             2494.04,    42.71,  61141.08,           61495.13,     -7.51,    -36.24,          30.20,  +2.50,  +0.49
  2,     UK002K,       0,  0.080468, 2459437.443293890450,   6.50981,  12.88716,              100.37733,  23.53741,       100.37561,       23.53440,      6.50981,     +12.88716,       6.51329,      +12.88569,  2074942.40, -3300267.59,  5162438.97,      53.124093,       +2.949643,  104460.58,  251281.14,    4846.27,             4879.75,   -46.16,  59310.59,           61495.13,      3.02,     14.58,          12.22,  +1.62,  -0.38
  3,     UK002K,       0,  0.120720, 2459437.443294356577,   6.30291,  12.46570,              100.82855,  23.32071,       100.82698,       23.31798,      6.30291,     +12.46570,       6.30627,      +12.46438,  2073872.55, -3301271.97,  5160284.55,      53.110673,       +2.928307,  102905.94,  249651.67,    7452.97,             7486.44,    84.24,  64759.39,           61495.13,      2.73,     13.17,          11.11,  +0.72,  -1.27
  4,     UK002K,       0,  0.160936, 2459437.443294821773,   6.11514,  12.10535,              101.22284,  23.14114,       101.21633,       23.12988,      6.11514,     +12.10535,       6.12759,      +12.09987,  2072958.19, -3302130.38,  5158443.24,      53.099194,       +2.910051,  101577.74,  248270.87,    9680.83,             9714.30,  -161.99,  55397.38,           60529.98,     11.18,     54.09,          45.89,  +0.67,  -1.30
  5,     UK002K,       0,  0.201200, 2459437.443295287900,   5.91846,  11.67299,              101.67051,  22.90829,       101.67055,       22.90835,      5.91846,     +11.67299,       5.91923,      +11.67302,  2071900.68, -3303123.17,  5156313.66,      53.085909,       +2.888965,  100042.23,  246691.05,   12257.47,            12290.95,   -62.38,  63993.70,           60749.33,     -0.07,     -0.32,           0.27,  +0.39,  -1.57
  6,     UK002K,       0,  0.241460, 2459437.443295754027,   5.70748,  11.24213,              102.12837,  22.68416,       102.12785,       22.68327,      5.70748,     +11.24213,       5.70941,      +11.24170,  2070845.98, -3304113.33,  5154189.74,      53.072650,       +2.867938,   98511.44,  245132.36,   14827.26,            14860.74,    30.62,  63829.92,           61157.92,      0.87,      4.21,           3.62,  +0.41,  -1.54
  7,     UK002K,       0,  0.281724, 2459437.443296219688,   5.49240,  10.79817,              102.59705,  22.45102,       102.59667,       22.45038,      5.49240,     +10.79817,       5.49425,      +10.79786,  2069774.79, -3305118.97,  5152032.61,      53.059173,       +2.846588,   96957.38,  243567.14,   17437.23,            17470.71,   163.55,  64821.43,           61633.61,      0.63,      3.06,           2.65,  +0.31,  -1.62
  8,     UK002K,       0,  0.321988, 2459437.443296685815,   5.28983,  10.36031,              103.04999,  22.21471,       103.05385,       22.22125,      5.28983,     +10.36031,       5.28433,      +10.36349,  2068739.85, -3306090.57,  5149948.50,      53.046142,       +2.825957,   95456.54,  242071.79,   19958.86,            19992.34,   208.14,  62627.34,           61921.84,     -6.39,    -30.83,          26.83,  +0.25,  -1.67
  9,     UK002K,       0,  0.362196, 2459437.443297151010,   5.11080,  10.00185,              103.43131,  22.02827,       103.43247,       22.03022,      5.11080,     +10.00185,       5.11027,      +10.00280,  2067890.07, -3306888.35,  5148237.25,      53.035436,       +2.808990,   94224.64,  240855.05,   22029.36,            22062.84,  -194.95,  51494.75,           61500.35,     -1.90,     -9.16,           8.01,  +0.68,  -1.23
  0,     UK0032,       1, -0.073259, 2459437.443292111158,  17.40394,  25.48158,               82.78680,  27.03133,        82.81670,       27.09199,     17.40394,     +25.48158,      17.33704,      +25.50944,  2079111.70, -3296353.44,  5170834.96,      53.176298,       +3.032805,  110525.45,  235258.60,       0.00,             5278.81,  9810.16,     -0.00,           64999.90,    -81.49,   -259.53,         238.50,  +5.47,  +3.61
  1,     UK0032,       1, -0.033119, 2459437.443292575888,  17.18777,  25.14002,               83.20464,  26.90419,        83.22012,       26.93544,     17.18777,     +25.14002,      17.15339,      +25.15436,  2077985.31, -3297410.89,  5168566.67,      53.162210,       +3.010339,  108885.96,  233022.44,    2744.46,             2534.35,  4596.29,  68372.26,           64999.90,    -41.49,   -132.58,         122.97,  +1.99,  +0.15
  2,     UK0032,       1,  0.007045, 2459437.443293040618,  17.00214,  24.78533,               83.60857,  26.74865,        83.62299,       26.77753,     17.00214,     +24.78533,      16.97054,      +24.79857,  2076878.54, -3298449.93,  5166337.90,      53.148356,       +2.988264,  107275.74,  230835.88,    5441.12,              162.31,  -246.63,  67141.24,           64999.90,    -38.03,   -121.58,         113.83,  +1.53,  -0.29
  3,     UK0032,       1,  0.047201, 2459437.443293505348,  16.85526,  24.46192,               83.95931,  26.59312,        83.98090,       26.63608,     16.85526,     +24.46192,      16.80844,      +24.48158,  2075909.89, -3299359.30,  5164387.28,      53.136222,       +2.968927,  105867.05,  228930.00,    7801.24,             2522.43,  -356.91,  58773.65,           64999.90,    -56.25,   -179.56,         169.54,  +1.14,  -0.66
  4,     UK0032,       1,  0.087353, 2459437.443293970078,  16.66164,  24.11554,               84.36236,  26.44797,        84.37743,       26.47778,     16.66164,     +24.11554,      16.62941,      +24.12917,  2074852.49, -3300352.00,  5162257.91,      53.122966,       +2.947835,  104329.89,  226860.28,   10377.63,             5098.82,  -250.67,  64165.86,           64281.87,    -38.67,   -123.64,         117.79,  +0.86,  -0.92
  5,     UK0032,       1,  0.127521, 2459437.443294435274,  16.48011,  23.74594,               84.77265,  26.27772,        84.78984,       26.31149,     16.48011,     +23.74594,      16.44375,      +23.76136,  2073769.77, -3301368.46,  5160077.57,      53.109383,       +2.926245,  102756.61,  224752.24,   13015.68,             7736.87,   -83.74,  65675.60,           64275.89,    -43.48,   -138.98,         133.64,  +0.81,  -0.95
  6,     UK0032,       1,  0.167677, 2459437.443294900004,  16.30141,  23.39745,               85.16483,  26.12135,        85.18075,       26.15241,     16.30141,     +23.39745,      16.26820,      +23.41162,  2072759.04, -3302317.34,  5158042.20,      53.096693,       +2.906083,  101288.53,  222794.02,   15478.34,            10199.53,   -91.48,  61327.16,           63957.82,    -39.69,   -126.92,         123.12,  +0.55,  -1.19
  7,     UK0032,       1,  0.207853, 2459437.443295364734,  16.12560,  23.01865,               85.57627,  25.93993,        85.59753,       25.98110,     16.12560,     +23.01865,      16.08155,      +23.03739,  2071697.61, -3303313.81,  5155904.73,      53.083357,       +2.884921,   99747.46,  220749.09,   18064.52,            12785.71,    23.08,  64371.47,           63859.78,    -52.24,   -166.89,         163.40,  +0.54,  -1.18
  8,     UK0032,       1,  0.248025, 2459437.443295829929,  15.94439,  22.64165,               85.98998,  25.76270,        86.01371,       25.80836,     15.94439,     +22.64165,      15.89565,      +22.66241,  2070653.89, -3304293.67,  5153802.91,      53.070234,       +2.864112,   98232.71,  218749.40,   20607.58,            15328.77,    94.76,  63304.14,           63776.98,    -57.51,   -183.66,         181.47,  +0.51,  -1.19
  9,     UK0032,       1,  0.288205, 2459437.443296294659,  15.77580,  22.26135,               86.39561,  25.57496,        86.42711,       25.63512,     15.77580,     +22.26135,      15.71145,      +22.28865,  2069632.68, -3305252.38,  5151746.45,      53.057384,       +2.843751,   96751.26,  216803.80,   23095.76,            17816.95,   111.07,  61925.89,           63633.80,    -75.32,   -240.20,         239.50,  +0.28,  -1.40
 10,     UK0032,       1,  0.328381, 2459437.443296759855,  15.56025,  21.84747,               86.86138,  25.38943,        86.88798,       25.43989,     15.56025,     +21.84747,      15.50669,      +21.87035,  2068511.95, -3306304.53,  5149489.56,      53.043271,       +2.821425,   95126.14,  214682.64,   25826.43,            20547.62,   370.12,  67967.75,           63752.80,    -62.58,   -199.81,         201.17,  +0.38,  -1.28
 11,     UK0032,       1,  0.368505, 2459437.443297224119,  15.36399,  21.52778,               87.24406,  25.26368,        87.25451,       25.28343,     15.36399,     +21.52778,      15.34406,      +21.53673,  2067633.54, -3307129.18,  5147720.65,      53.032202,       +2.803892,   93852.86,  213027.71,   27966.69,            22687.88,    41.96,  53341.19,           63421.40,    -24.25,    -77.68,          78.79,  +1.29,  -0.35

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.