Orbital Analysis for matched events on 20211111_225416.730_UK

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Summary for Event
-----------------
shower ID 557 SFD (64 Draconids)
Lg 358.41° Bg 76.27° Vg 19.67km/s
mass 0.50323g, abs. mag -1.1
best visual mag 0.5
Path Details
------------
start -2.82° 49.62° 82.82km
end   -2.74° 49.55° 72.45km

Orbit Details
-------------
Semimajor axis 3.17A.U., eccentricity 0.69, inclination 29.54°, Period 5.66Y, LA Sun 229.47°, last Perihelion 2016-03-26

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: 2459530.454360309988
Time: 2021-11-11 22:54:16.730783 UTC


Plane intersections
-------------------
Intersection 1 - Stations: UK0038 and UK003J
 Convergence angle = 0.61970 deg
 R.A. =  22.36374  Dec = -14.31504 deg
Intersection 2 - Stations: UK0038 and UK003N
 Convergence angle = 29.47963 deg
 R.A. = 308.00345  Dec = +64.14973 deg
Intersection 3 - Stations: UK003J and UK003N
 Convergence angle = 29.41819 deg
 R.A. = 309.80337  Dec = +63.18230 deg

Best intersection: Stations UK0038 and UK003N with Qconv = 29.48 deg


Least squares solution
----------------------
State vector (ECI, epoch of date):
 X =   3554641.61 +/- 355.14 m
 Y =   2225176.08 +/- 128.41 m
 Z =   4898524.79 +/- 234.52 m
 Vx =     6028.29 +/- 1263.24 m/s
 Vy =    -7774.85 +/- 84.47 m/s
 Vz =    20337.41 +/- 581.02 m/s

State vector covariance matrix (X, Y, Z, Vx, Vy, Vz):
+1.337091e+05, +3.566684e+04, -7.303366e+04, +3.976783e+05, +5.358730e+04, -1.783998e+05
+3.566684e+04, +1.758862e+04, -2.754596e+04, +9.464107e+04, +2.307490e+04, -3.473545e+04
-7.303366e+04, -2.754596e+04, +5.861739e+04, -2.296442e+05, -2.599503e+04, +9.029934e+04
+3.976783e+05, +9.464107e+04, -2.296442e+05, +1.365385e+06, +1.219017e+05, -6.090460e+05
+5.358730e+04, +2.307490e+04, -2.599503e+04, +1.219017e+05, +5.286534e+04, -6.140216e+04
-1.783998e+05, -3.473545e+04, +9.029934e+04, -6.090460e+05, -6.140216e+04, +3.072936e+05

Timing offsets (from input data):
    UK0038: -0.000024 s
    UK003J: 0.000000 s
    UK003N: -0.004240 s

Reference point on the trajectory:
  Time: 2021-11-11 22:54:16.730783 UTC
  Lon     = +-2.822081 +/- 0.0018 deg
  Lat     = +49.620456 +/- 0.0036 deg
  Lat geo = +49.432864 +/- 0.0036 deg
  Ht      =   82623.25 +/- 115.86 m

  JD dynamic   = 2459530.455161050893 
  LST apparent = 32.0462237008 deg
Radiant (apparent in ECI which includes Earth's rotation, epoch of date):
  R.A.      = 307.78851 +/- 5.7948 deg
  Dec       = +64.18486 +/- 1.9524 deg
  Azimuth   = 321.76959 +/- 3.9308 deg
  Elevation = +45.55925 +/- 1.5426 deg
  Vavg      =  21.92720 +/- 0.0879 km/s
  Vinit     =  22.59201 +/- 0.2742 km/s
Radiant (apparent ground-fixed, epoch of date):
  R.A.      = 307.97239 +/- 5.7948 deg
  Dec       = +64.88347 +/- 1.9524 deg
  Azimuth   = 322.65016 +/- 3.9308 deg
  Elevation = +45.90055 +/- 1.5426 deg
  Vavg      =  21.79639 +/- 0.0879 km/s
  Vinit     =  22.46120 +/- 0.2742 km/s
Radiant (geocentric, J2000):
  R.A.   = 301.14933 +/- 6.1333 deg
  Dec    = +62.70687 +/- 1.8168 deg
  Vg     =  19.66661 +/- 0.3151 km/s
  Vinf   =  22.59201 +/- 0.2742 km/s
  Zc     =  44.58823 +/- 1.5500 deg
  Zg     =  47.83985 +/- 1.6078 deg
Radiant (ecliptic geocentric, J2000):
  Lg     = 358.41039 +/- 2.9999 deg
  Bg     = +76.27382 +/- 3.2809 deg
  Vh     =  38.89467 +/- 0.5750 km/s
Radiant (ecliptic heliocentric, J2000):
  Lh     = 325.13896 +/- 0.9062 deg
  Bh     = +29.42038 +/- 1.3111 deg
  Vh_x   = -27.79892 +/- 1.0402 km/s
  Vh_y   =  19.36471 +/- 0.1994 km/s
  Vh_z   = -19.10559 +/- 0.5279 km/s
Orbit:
  La Sun = 229.474331 +/- 0.0000 deg
  a      =   3.174262 +/- 0.4783 AU
  e      =   0.690954 +/- 0.0500
  i      =  29.540587 +/- 1.2801 deg
  peri   = 192.080741 +/- 1.6459 deg
  node   = 229.473096 +/- 0.0001 deg
  Pi     =  61.553838 +/- 1.6458 deg
  q      =   0.980992 +/- 0.0026 AU
  f      = 347.920621 +/- 1.6458 deg
  M      = 358.394354 +/- 0.2451 deg
  Q      =   5.367531 +/- 0.9589 AU
  n      =   0.174277 +/- 0.0428 deg/day
  T      =   5.655419 +/- 1.2792 years
  Last perihelion JD = 2457473.990739 (2016-03-26 11:46:39.827354) +/- 466.2907 days
  Tj     =   2.621882 +/- 0.2362
Shower association:
  IAU No.  =  557
  IAU code =  SFD

Orbit covariance matrix:
             e     ,     q (AU)   ,      Tp (JD) ,   node (deg) ,   peri (deg) ,    i (deg)
e   , +2.652578e-03, -1.219085e-04, -2.420979e+01, -2.970739e-06, +7.316510e-02, -6.155269e-02
q   , -1.219085e-04, +7.206986e-06, +1.164997e+00, +1.586224e-07, -4.509515e-03, +3.271256e-03
Tp  , -2.420979e+01, +1.164997e+00, +2.299871e+05, +2.853377e-02, -6.945068e+02, +5.867357e+02
node, -2.970739e-06, +1.586224e-07, +2.853377e-02, +4.026395e-09, -9.739488e-05, +8.344253e-05
peri, +7.316510e-02, -4.509515e-03, -6.945068e+02, -9.739488e-05, +2.861907e+00, -2.014262e+00
i   , -6.155269e-02, +3.271256e-03, +5.867357e+02, +8.344253e-05, -2.014262e+00, +1.732705e+00

Jacchia fit on lag = -|a1|*exp(|a2|*t):
 a1 = 3.517832
 a2 = 6.348941

Mean time residuals from time vs. length:
  Station with reference time: UK003J
  Avg. res. = 2.031e-05 s
  Stddev    = 4.51e-03 s

Begin point on the trajectory:
  Lon =    -2.823693 +/- 0.0019 deg
  Lat =    49.621786 +/- 0.0033 deg
  Ht  = 82817.70 +/- 124.19 m
End point on the trajectory:
  Lon =    -2.740418 +/- 0.0037 deg
  Lat =    49.550686 +/- 0.0029 deg
  Ht  = 72445.47 +/- 162.43 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
    UK0038,   False,    -2.379250,    51.361350,  169.00,  24.284005,   2.648785,    80994.98,    75805.95,          0.039514,    144.68,     31.88,              97.37, 0.9836,    True,    True, {"ff_name": "FF_UK0038_20211111_225412_092_0528128.fits"}
    UK003J,   False,    -2.379250,    51.361350,  169.00,   0.000000,   0.000000,    82817.70,    77332.91,          0.045069,    164.92,     36.15,              97.37, 0.9836,    True,    True, {"ff_name": "FF_UK003J_20211111_225415_412_0528128.fits"}
    UK003N,   False,    -0.162561,    51.236425,  112.00,   0.373830,   9.854178,    78711.97,    72445.47,          0.024394,    105.92,     48.70,              79.90, 0.9692,    True,   False, {"ff_name": "FF_UK003N_20211111_225410_677_0540928.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,     UK0038,       1,  0.088499, 2459530.454361337703,  23.64518, -16.74019,              189.10324,  21.46003,       189.16385,       21.42580,     23.64518,     -16.74019,      23.58214,      -16.76840,  3554222.89,  2225716.12,  4897112.15,      49.612794,       -2.813162,   81502.91,  214220.58,       0.00,             1569.25,    47.23,      0.00,           22758.46,    -52.79,    241.02,         237.57,  +4.74,  +3.09
  1,     UK0038,       0,  0.128679, 2459530.454361802898,  23.58260, -16.97464,              189.14116,  21.22065,       189.06272,       21.26503,     23.58260,     -16.97464,      23.66284,      -16.93804,  3554033.04,  2225960.98,  4896471.66,      49.609319,       -2.809118,   80994.98,  214335.41,     711.50,             2280.75,  -149.02,  17707.75,           22758.46,     68.86,   -312.43,         307.89,  +2.44,  +0.78
  2,     UK0038,       0,  0.168903, 2459530.454362268560,  23.76699, -17.19109,              188.92940,  21.02341,       188.91477,       21.03168,     23.76699,     -17.19109,      23.78169,      -17.18425,  3553757.14,  2226316.81,  4895540.87,      49.604267,       -2.803165,   80256.92,  214505.56,    1745.47,             3314.72,   -23.79,  25705.27,           22758.46,     12.83,    -58.39,          57.48,  +1.97,  +0.31
  3,     UK0038,       0,  0.209119, 2459530.454362733755,  23.90790, -17.40531,              188.76303,  20.82381,       188.77825,       20.81521,     23.90790,     -17.40531,      23.89193,      -17.41244,  3553500.95,  2226647.22,  4894676.59,      49.599575,       -2.797649,   79571.65,  214667.96,    2705.56,             4274.81,    27.75,  23873.44,           22758.46,    -13.36,     60.85,          59.86,  +2.15,  +0.49
  4,     UK0038,       0,  0.249291, 2459530.454363198951,  23.99967, -17.58629,              188.65072,  20.65240,       188.66982,       20.64162,     23.99967,     -17.58629,      23.97983,      -17.59525,  3553295.36,  2226912.38,  4893982.98,      49.595809,       -2.793255,   79021.72,  214801.59,    3476.07,             5045.31,  -109.32,  19180.15,           22253.16,    -16.78,     76.43,          75.14,  +2.23,  +0.57
  5,     UK0038,       0,  0.289511, 2459530.454363664612,  24.07010, -17.83085,              188.55382,  20.41559,       188.53486,       20.42629,     24.07010,     -17.83085,      24.08988,      -17.82193,  3553040.04,  2227241.68,  4893121.62,      49.591130,       -2.787758,   78338.85,  214970.82,    4432.92,             6002.17,   -61.11,  23790.56,           22328.45,     16.72,    -76.02,          74.68,  +1.27,  -0.39
  6,     UK0038,       0,  0.329711, 2459530.454364129808,  24.19852, -18.03176,              188.40340,  20.22745,       188.40890,       20.22435,     24.19852,     -18.03176,      24.19308,      -18.03435,  3552800.34,  2227550.82,  4892312.95,      49.586737,       -2.782608,   77697.80,  215133.51,    5331.24,             6900.48,   -70.99,  22346.11,           22357.23,     -4.85,     22.06,          21.66,  +0.92,  -0.74
  7,     UK0038,       0,  0.369915, 2459530.454364595003,  24.29635, -18.24995,              188.28269,  20.01912,       188.28161,       20.01973,     24.29635,     -18.24995,      24.29792,      -18.24944,  3552557.19,  2227864.41,  4891492.67,      49.582279,       -2.777381,   77047.59,  215302.16,    6242.46,             7811.70,   -68.06,  22664.92,           22394.86,      0.96,     -4.35,           4.26,  +0.52,  -1.15
  8,     UK0038,       0,  0.410151, 2459530.454365060665,  24.34566, -18.51819,              188.20624,  19.75649,       188.14086,       19.79336,     24.34566,     -18.51819,      24.41449,      -18.48724,  3552287.86,  2228211.77,  4890584.04,      49.577340,       -2.771573,   76327.43,  215493.11,    7251.82,             8821.07,    32.28,  25086.00,           22591.99,     58.07,   -263.42,         258.20,  +0.53,  -1.14
  9,     UK0038,       0,  0.450303, 2459530.454365525395,  24.50932, -18.65363,              188.02880,  19.63606,       188.04030,       19.62959,     24.50932,     -18.65363,      24.49809,      -18.65908,  3552092.84,  2228463.30,  4889926.10,      49.573762,       -2.767413,   75805.95,  215634.59,    7982.70,             9551.95,  -143.95,  18202.83,           22453.25,    -10.19,     46.37,          45.42,  +0.72,  -0.95
  0,     UK003J,       0,  0.000000, 2459530.454360309988,  23.38181, -16.32447,              189.42028,  21.84700,       189.42848,       21.84235,     23.38181,     -16.32447,      23.37230,      -16.32827,  3554714.29,  2225082.35,  4898769.97,      49.621786,       -2.823693,   82817.70,  213934.55,       0.00,              272.36,   749.72,      0.00,           20795.84,     -7.14,     32.53,          32.11,  +5.28,  +3.63
  1,     UK003J,       0,  0.040144, 2459530.454360774253,  23.46306, -16.54713,              189.31145,  21.63384,       189.29974,       21.64046,     23.46306,     -16.54713,      23.47415,      -16.54169,  3554476.21,  2225389.41,  4897966.77,      49.617430,       -2.818579,   82180.67,  214071.10,     892.24,              619.89,   190.32,  22226.09,           20795.84,     10.22,    -46.52,          45.90,  +4.79,  +3.14
  2,     UK003J,       0,  0.080216, 2459530.454361238051,  23.62882, -16.70447,              189.12394,  21.49394,       189.18503,       21.45944,     23.62882,     -16.70447,      23.56528,      -16.73289,  3554262.59,  2225664.91,  4897246.10,      49.613521,       -2.814007,   81609.14,  214196.84,    1692.80,             1420.44,    85.57,  19978.04,           20795.84,    -53.18,    242.81,         239.36,  +3.92,  +2.27
  3,     UK003J,       0,  0.120364, 2459530.454361702781,  23.67989, -16.91952,              189.04793,  21.28507,       189.06771,       21.27390,     23.67989,     -16.91952,      23.65892,      -16.92874,  3554043.48,  2225947.52,  4896506.88,      49.609510,       -2.809314,   81022.92,  214328.76,    2513.98,             2241.62,    -0.28,  20453.78,           20795.84,    -17.28,     78.76,          77.60,  +2.09,  +0.43
  4,     UK003J,       0,  0.160488, 2459530.454362167045,  23.83119, -17.14435,              188.86907,  21.07612,       188.92304,       21.04566,     23.83119,     -17.14435,      23.77509,      -17.16956,  3553773.64,  2226295.53,  4895596.54,      49.604569,       -2.803494,   80301.07,  214494.98,    3525.23,             3252.87,   104.49,  25203.15,           21615.99,    -47.17,    215.25,         211.90,  +2.40,  +0.74
  5,     UK003J,       0,  0.200632, 2459530.454362631775,  23.91503, -17.36802,              188.75976,  20.86160,       188.79470,       20.84188,     23.91503,     -17.36802,      23.87865,      -17.38438,  3553532.50,  2226606.53,  4894783.03,      49.600153,       -2.798312,   79656.05,  214647.58,    4428.93,             4156.57,   101.26,  22511.35,           21978.27,    -30.62,    139.58,         137.32,  +2.06,  +0.40
  6,     UK003J,       0,  0.240740, 2459530.454363096040,  24.04017, -17.55853,              188.61257,  20.68382,       188.67393,       20.64923,     24.04017,     -17.55853,      23.97657,      -17.58730,  3553304.33,  2226900.81,  4894013.26,      49.595973,       -2.793417,   79045.74,  214795.41,    5284.04,             5011.68,    50.25,  21320.19,           22037.12,    -53.79,    245.47,         241.31,  +2.46,  +0.80
  7,     UK003J,       0,  0.280852, 2459530.454363560304,  24.10827, -17.73029,              188.52566,  20.51922,       188.57566,       20.49103,     24.10827,     -17.73029,      24.05651,      -17.75377,  3553116.85,  2227142.61,  4893380.74,      49.592538,       -2.789425,   78544.26,  214919.61,    5986.68,             5714.32,  -153.33,  17516.86,           21685.08,    -43.91,    200.28,         196.78,  +2.61,  +0.95
  8,     UK003J,       0,  0.320980, 2459530.454364025034,  24.20980, -17.94417,              188.40098,  20.31566,       188.44919,       20.28849,     24.20980,     -17.94417,      24.15997,      -17.96687,  3552876.52,  2227452.57,  4892569.96,      49.588133,       -2.784260,   77901.52,  215081.56,    6887.34,             6614.98,  -159.24,  22444.76,           21571.43,    -42.42,    193.44,         189.92,  +1.22,  -0.44
  9,     UK003J,       0,  0.361128, 2459530.454364489298,  24.25137, -18.15481,              188.33760,  20.10977,       188.33814,       20.10946,     24.25137,     -18.15481,      24.25121,      -18.15506,  3552663.90,  2227726.79,  4891852.66,      49.584235,       -2.779710,   77332.91,  215228.02,    7684.16,             7411.80,  -269.44,  19847.14,           21419.45,     -0.48,      2.17,           2.13,  +1.63,  -0.03
  0,     UK003N,       0,  0.259213, 2459530.454363376368, 348.96064, -11.90279,              226.65184,  15.46833,       226.64888,       15.47113,    348.96064,     -11.90279,     348.96455,      -11.90164,  3553179.54,  2227061.76,  4893592.24,      49.593686,       -2.790750,   78711.97,  274378.30,       0.00,             5479.37,   100.60,      0.00,           19686.78,      8.00,    -17.41,          14.40,  +4.51,  +2.32
  1,     UK003N,       0,  0.299321, 2459530.454363840632, 348.99929, -12.06468,              226.53904,  15.34259,       226.52944,       15.35169,    348.99929,     -12.06468,     349.01215,      -12.06092,  3552964.52,  2227339.07,  4892866.86,      49.589746,       -2.786146,   78136.90,  274278.77,     805.80,             6285.17,     0.28,  20090.79,           19686.78,     25.93,    -56.43,          46.70,  +3.31,  +1.12
  2,     UK003N,       0,  0.339409, 2459530.454364304431, 349.01513, -12.18797,              226.46544,  15.24061,       226.44166,       15.26314,    349.01513,     -12.18797,     349.04695,      -12.17866,  3552805.55,  2227544.10,  4892330.55,      49.586832,       -2.782787,   77711.72,  274208.78,    1401.57,             6880.94,  -309.63,  14861.43,           19686.78,     64.27,   -139.81,         115.75,  +2.71,  +0.52
  3,     UK003N,       0,  0.379541, 2459530.454364769161, 349.08519, -12.38974,              226.30562,  15.09362,       226.28833,       15.11000,    349.08519,     -12.38974,     349.10861,      -12.38296,  3552530.25,  2227899.16,  4891401.78,      49.581785,       -2.776846,   76975.54,  274084.62,    2433.29,             7912.66,  -184.56,  25708.35,           19686.78,     46.73,   -101.67,          84.21,  +1.03,  -1.16
  4,     UK003N,       0,  0.419697, 2459530.454365233891, 349.15276, -12.62312,              226.13322,  14.91731,       226.11383,       14.93566,    349.15276,     -12.62312,     349.17914,      -12.61551,  3552217.24,  2228302.86,  4890345.79,      49.576044,       -2.770068,   76138.61,  273946.93,    3606.36,             9085.73,    81.30,  29212.69,           22035.97,     52.37,   -113.92,          94.40,  +1.10,  -1.09
  5,     UK003N,       0,  0.459833, 2459530.454365698155, 349.20052, -12.82790,              225.99256,  14.75726,       225.96347,       14.78477,    349.20052,     -12.82790,     349.23998,      -12.81648,  3551946.90,  2228651.53,  4889433.73,      49.571085,       -2.764237,   75415.81,  273833.06,    4619.53,            10098.90,   187.71,  25243.38,           23165.04,     78.57,   -170.88,         141.67,  +1.55,  -0.64
  6,     UK003N,       0,  0.499929, 2459530.454366162419, 349.25336, -12.97457,              225.87533,  14.65091,       225.85245,       14.67254,    349.25336,     -12.97457,     349.28476,      -12.96559,  3551746.30,  2228910.24,  4888757.00,      49.567404,       -2.759954,   74879.50,  273753.01,    5371.28,            10850.65,    33.61,  18748.71,           23095.24,     61.78,   -134.39,         111.45,  +1.71,  -0.48
  7,     UK003N,       0,  0.540021, 2459530.454366626684, 349.33698, -13.13124,              225.72602,  14.54940,       225.72836,       14.54719,    349.33698,     -13.13124,     349.33505,      -13.13216,  3551522.40,  2229199.01,  4888001.63,      49.563295,       -2.755153,   74280.92,  273665.11,    6210.39,            11689.76,   -33.03,  20929.64,           22885.85,     -6.31,     13.74,          11.40,  +1.67,  -0.52
  8,     UK003N,       0,  0.580117, 2459530.454367090482, 349.37532, -13.27583,              225.62309,  14.43820,       225.62200,       14.43922,    349.37532,     -13.27583,     349.37811,      -13.27540,  3551329.90,  2229447.29,  4887352.19,      49.559761,       -2.751048,   73766.28,  273592.65,    6931.82,            12411.19,  -217.45,  17992.75,           22462.14,      2.93,     -6.38,           5.30,  +2.45,  +0.26
  9,     UK003N,       0,  0.620229, 2459530.454367554747, 349.42067, -13.44501,              225.50238,  14.30820,       225.49736,       14.31294,    349.42067,     -13.44501,     349.42886,      -13.44303,  3551104.81,  2229737.59,  4886592.82,      49.555628,       -2.746221,   73164.60,  273508.94,    7775.37,            13254.74,  -280.11,  21029.83,           22168.27,     13.53,    -29.44,          24.44,  +2.01,  -0.17
 10,     UK003N,       0,  0.660377, 2459530.454368019477, 349.44985, -13.65500,              225.37698,  14.13465,       225.34809,       14.16190,    349.44985,     -13.65500,     349.49000,      -13.64362,  3550835.75,  2230084.61,  4885685.09,      49.550686,       -2.740418,   72445.47,  273410.65,    8783.73,            14263.10,  -178.77,  25116.11,           22142.04,     77.92,   -169.44,         140.70,  +3.42,  +1.24

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.