Orbital Analysis for matched events on 20210929_020148.603_UK

Summary for Event
-----------------
shower ID -1 spo
Lg 10.74° Bg 14.43° Vg 26.97km/s
mass 0.03185g, abs. mag 1.7
Path Details
------------
start -3.26° 50.85° 92.26km
end   -3.13° 50.92° 77.61km

Orbit Details
-------------
Semimajor axis 3.33A.U., eccentricity 0.85, inclination 13.73°, Period 6.06Y, LA Sun 185.86°, last Perihelion 2015-10-18

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: 2459486.584590318147
Time: 2021-09-29 02:01:48.603488 UTC


Plane intersections
-------------------
Intersection 1 - Stations: UK000T and UK003Z
 Convergence angle = 13.49465 deg
 R.A. =   5.27727  Dec = +19.13585 deg

Best intersection: Stations UK000T and UK003Z with Qconv = 13.49 deg


Least squares solution
----------------------
State vector (ECI, epoch of date):
 X =   3342574.44 +/- 81.72 m
 Y =   2362551.99 +/- 79.80 m
 Z =   4994661.03 +/- 26.24 m
 Vx =    27465.89 +/- 603.25 m/s
 Vy =     2461.44 +/- 223.56 m/s
 Vz =     9498.16 +/- 221.31 m/s

State vector covariance matrix (X, Y, Z, Vx, Vy, Vz):
+7.223929e+03, +6.879859e+03, +2.298401e+03, -7.304288e+03, +1.125334e+04, -3.005077e+03
+6.879859e+03, +6.681011e+03, +2.205747e+03, -5.128829e+03, +1.135145e+04, -2.247062e+03
+2.298401e+03, +2.205747e+03, +7.520017e+02, -2.516402e+03, +3.573692e+03, -9.745893e+02
-7.304288e+03, -5.128829e+03, -2.516402e+03, +3.275533e+05, +3.530882e+04, +1.114631e+05
+1.125334e+04, +1.135145e+04, +3.573692e+03, +3.530882e+04, +3.166580e+04, +1.081467e+04
-3.005077e+03, -2.247062e+03, -9.745893e+02, +1.114631e+05, +1.081467e+04, +3.814813e+04

Timing offsets (from input data):
    UK000T: 0.000000 s
    UK003Z: 0.006270 s

Reference point on the trajectory:
  Time: 2021-09-29 02:01:48.603488 UTC
  Lon     = +-3.258195 +/- 0.0003 deg
  Lat     = +50.850580 +/- 0.0006 deg
  Lat geo = +50.664723 +/- 0.0006 deg
  Ht      =   92268.45 +/- 91.12 m

  JD dynamic   = 2459486.585391059052 
  LST apparent = 35.2529027153 deg
Radiant (apparent in ECI which includes Earth's rotation, epoch of date):
  R.A.      =   5.12105 +/- 0.3546 deg
  Dec       = +19.00556 +/- 0.0336 deg
  Azimuth   = 227.92086 +/- 0.4670 deg
  Elevation = +50.24777 +/- 0.1511 deg
  Vavg      =  28.92900 +/- 0.0887 km/s
  Vinit     =  29.16589 +/- 0.6300 km/s
Radiant (apparent ground-fixed, epoch of date):
  R.A.      =   5.66033 +/- 0.3546 deg
  Dec       = +19.10111 +/- 0.0336 deg
  Azimuth   = 227.29899 +/- 0.4670 deg
  Elevation = +50.58234 +/- 0.1511 deg
  Vavg      =  28.78852 +/- 0.0887 km/s
  Vinit     =  29.02541 +/- 0.6300 km/s
Radiant (geocentric, J2000):
  R.A.   =   3.99320 +/- 0.3764 deg
  Dec    = +17.48113 +/- 0.0594 deg
  Vg     =  26.96668 +/- 0.6790 km/s
  Vinf   =  29.16589 +/- 0.6300 km/s
  Zc     =  39.62787 +/- 0.1522 deg
  Zg     =  41.24535 +/- 0.1893 deg
Radiant (ecliptic geocentric, J2000):
  Lg     =  10.73692 +/- 0.3401 deg
  Bg     = +14.42946 +/- 0.1557 deg
  Vh     =  38.78467 +/- 0.4156 km/s
Radiant (ecliptic heliocentric, J2000):
  Lh     = 319.79501 +/- 0.8152 deg
  Bh     =  +9.98073 +/- 0.1674 deg
  Vh_x   = -29.17311 +/- 0.6358 km/s
  Vh_y   =  24.65754 +/- 0.2252 km/s
  Vh_z   =  -6.72204 +/- 0.1872 km/s
Orbit:
  La Sun = 185.859205 +/- 0.0000 deg
  a      =   3.325577 +/- 0.7272 AU
  e      =   0.852767 +/- 0.0197
  i      =  13.731568 +/- 0.3964 deg
  peri   = 276.357442 +/- 0.7126 deg
  node   = 185.863978 +/- 0.0001 deg
  Pi     = 102.221420 +/- 0.7126 deg
  q      =   0.489636 +/- 0.0086 AU
  f      = 263.639129 +/- 0.7126 deg
  M      = 353.032095 +/- 1.1762 deg
  Q      =   6.161519 +/- 1.4602 AU
  n      =   0.162519 +/- 0.0265 deg/day
  T      =   6.064587 +/- 2.3371 years
  Last perihelion JD = 2457314.330941 (2015-10-18 19:56:33.331169) +/- 854.2066 days
  Tj     =   2.376076 +/- 0.1948
Shower association:
  IAU No.  =   -1
  IAU code =  ...

Orbit covariance matrix:
             e     ,     q (AU)   ,      Tp (JD) ,   node (rad) ,   peri (rad) ,    i (rad)
e   , +3.757052e-04, -1.087252e-04, -1.619079e+01, -3.041948e-08, -1.354788e-05, +1.317913e-04
q   , -1.087252e-04, +6.342961e-05, +4.273464e+00, +8.852552e-09, -6.547558e-05, -3.809773e-05
Tp  , -1.619079e+01, +4.273464e+00, +7.180371e+05, +1.307001e-03, +1.463804e+00, -5.682575e+00
node, -3.041948e-08, +8.852552e-09, +1.307001e-03, +2.476002e-12, +9.934836e-10, -1.071947e-08
peri, -1.354788e-05, -6.547558e-05, +1.463804e+00, +9.934836e-10, +1.511597e-04, -4.842945e-06
i   , +1.317913e-04, -3.809773e-05, -5.682575e+00, -1.071947e-08, -4.842945e-06, +4.643106e-05

Jacchia fit on lag = -|a1|*exp(|a2|*t):
 a1 = 9.858426
 a2 = 3.306349

Mean time residuals from time vs. length:
  Station with reference time: UK000T
  Avg. res. = 2.023e-04 s
  Stddev    = 1.42e-02 s

Begin point on the trajectory:
  Lon =    -3.258152 +/- 0.0003 deg
  Lat =    50.850604 +/- 0.0006 deg
  Ht  = 92263.52 +/- 88.71 m
End point on the trajectory:
  Lon =    -3.133718 +/- 0.0015 deg
  Lat =    50.923113 +/- 0.0002 deg
  Ht  = 77611.90 +/- 69.65 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
    UK000T,   False,    -3.557111,    51.483925,   37.50,   2.820464,   8.631004,    92263.52,    79558.35,          0.005223,      9.94,      0.89,              39.69, 1.0000,    True,    True, {"ff_name": "FF_UK000T_20210929_020142_696_0661760.fits"}
    UK003Z,   False,    -1.639327,    51.011519,   64.00,  25.819889,   0.000000,    89783.90,    77611.90,          0.010934,     25.35,      6.89,              25.10, 1.0000,    True,    True, {"ff_name": "FF_UK003Z_20210929_020143_810_0687360.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,     UK000T,       0,  0.000000, 2459486.584590318147,  45.65124,  13.36494,              163.35540,  50.91410,       163.35407,       50.91594,     45.65124,     +13.36494,      45.65174,      +13.36691,  3342568.39,  2362551.45,  4994658.94,      50.850604,       -3.258152,   92263.52,  118259.21,       0.00,                6.42,   498.40,      0.00,           26820.60,     -0.37,      4.16,           7.29,  +3.99,  +3.63
  1,     UK000T,       0,  0.040080, 2459486.584590781946,  46.00102,  13.27631,              162.85192,  50.76371,       162.84818,       50.76883,     46.00102,     +13.27631,      46.00258,      +13.28179,  3341478.89,  2362453.81,  4994282.17,      50.854998,       -3.250632,   91374.09,  117363.33,    1156.94,             1163.36,   486.37,  28865.80,           26820.60,     -1.03,     11.52,          20.32,  +3.15,  +2.80
  2,     UK000T,       0,  0.080128, 2459486.584591245744,  46.30713,  13.21305,              162.40918,  50.64470,       162.41296,       50.63958,     46.30713,     +13.21305,      46.30606,      +13.20756,  3340546.51,  2362370.25,  4993959.74,      50.858758,       -3.244217,   90613.00,  116599.89,    2147.03,             2153.44,   308.42,  24722.45,           26820.60,      1.02,    -11.45,          20.34,  +2.66,  +2.33
  3,     UK000T,       0,  0.120208, 2459486.584591709543,  46.64950,  13.12332,              161.92216,  50.49142,       161.92231,       50.49121,     46.64950,     +13.12332,      46.64994,      +13.12310,  3339505.90,  2362276.99,  4993599.88,      50.862956,       -3.237035,   89763.61,  115752.02,    3252.05,             3258.46,   244.47,  27570.34,           26820.60,      0.04,     -0.46,           0.82,  +2.25,  +1.93
  4,     UK000T,       0,  0.160288, 2459486.584592173342,  47.03258,  13.02954,              161.37827,  50.32444,       161.37898,       50.32351,     47.03258,     +13.02954,      47.03299,      +13.02853,  3338365.24,  2362174.77,  4993205.42,      50.867558,       -3.229143,   88832.63,  114827.76,    4463.31,             4469.73,   286.76,  30221.09,           27505.99,      0.18,     -2.07,           3.73,  +2.12,  +1.82
  5,     UK000T,       0,  0.200348, 2459486.584592637140,  47.34606,  12.95865,              160.93366,  50.19203,       160.93922,       50.18479,     47.34606,     +12.95865,      47.34488,      +12.95083,  3337445.85,  2362092.37,  4992887.48,      50.871268,       -3.222811,   88082.29,  114086.13,    5439.60,             5446.02,    94.67,  24370.78,           27254.00,      1.43,    -16.00,          29.04,  +1.98,  +1.69
  6,     UK000T,       0,  0.240436, 2459486.584593100939,  47.71682,  12.85847,              160.41597,  50.01771,       160.41658,       50.01693,     47.71682,     +12.85847,      47.71761,      +12.85763,  3336364.79,  2361995.49,  4992513.63,      50.875630,       -3.215333,   87200.08,  113218.95,    6587.58,             6594.00,    73.45,  28636.46,           27312.19,      0.15,     -1.72,           3.14,  +1.71,  +1.44
  7,     UK000T,       0,  0.280516, 2459486.584593564738,  48.07699,  12.76671,              159.91420,  49.85203,       159.91410,       49.85215,     48.07699,     +12.76671,      48.07819,      +12.76684,  3335332.90,  2361903.02,  4992156.79,      50.879795,       -3.208200,   86358.06,  112395.69,    7683.33,             7689.75,     0.23,  27339.04,           27338.67,     -0.02,      0.26,           0.49,  +1.65,  +1.40
  8,     UK000T,       0,  0.320600, 2459486.584594029002,  48.47025,  12.66789,              159.36915,  49.67048,       159.36959,       49.66993,     48.47025,     +12.66789,      48.47143,      +12.66729,  3334224.90,  2361803.72,  4991773.62,      50.884268,       -3.200525,   85454.01,  111516.99,    8859.91,             8866.33,     7.73,  29352.98,           27485.36,      0.11,     -1.20,           2.23,  +1.65,  +1.41
  9,     UK000T,       1,  0.360656, 2459486.584594492335,  48.83704,  12.59331,              158.85764,  49.51642,       158.87130,       49.49959,     48.83704,     +12.59331,      48.83367,      +12.57490,  3333217.19,  2361713.41,  4991425.14,      50.888337,       -3.193556,   84631.83,  110722.26,    9930.00,             9936.42,   -90.46,  26714.75,           27518.01,      3.26,    -36.61,          68.46,  +1.55,  +1.33
 10,     UK000T,       0,  0.400764, 2459486.584594956599,  49.22136,  12.47620,              158.33872,  49.31519,       158.33953,       49.31420,     49.22136,     +12.47620,      49.22275,      +12.47512,  3332150.78,  2361617.84,  4991056.36,      50.892643,       -3.186169,   83761.84,  109886.38,   11062.41,            11068.83,  -127.83,  28234.01,           27568.40,      0.19,     -2.14,           4.04,  +1.54,  +1.34
 11,     UK000T,       0,  0.440852, 2459486.584595420398,  49.59171,  12.37561,              157.83751,  49.13142,       157.83486,       49.13461,     49.59171,     +12.37561,      49.59449,      +12.37911,  3331145.11,  2361527.71,  4990708.58,      50.896705,       -3.179208,   82941.45,  109102.73,   12130.32,            12136.74,  -229.12,  26639.25,           27561.71,     -0.62,      6.88,          13.05,  +1.44,  +1.25
 12,     UK000T,       0,  0.480932, 2459486.584595884662,  49.99116,  12.27766,              157.29646,  48.94149,       157.29795,       48.93974,     49.99116,     +12.27766,      49.99265,      +12.27572,  3330083.79,  2361432.60,  4990341.56,      50.900992,       -3.171850,   82075.73,  108281.02,   13257.34,            13263.76,  -271.07,  28119.17,           27576.05,      0.34,     -3.78,           7.23,  +1.49,  +1.32
 13,     UK000T,       0,  0.521032, 2459486.584596348461,  50.38139,  12.16793,              156.77662,  48.74040,       156.77259,       48.74511,     50.38139,     +12.16793,      50.38499,      +12.17316,  3329052.21,  2361340.15,  4989984.82,      50.905159,       -3.164700,   81234.33,  107487.44,   14352.76,            14359.18,  -345.20,  27317.35,           27577.67,     -0.91,     10.11,          19.48,  +1.57,  +1.41
 14,     UK000T,       0,  0.561128, 2459486.584596812725,  50.81172,  12.05403,              156.20466,  48.52334,       156.20005,       48.52865,     50.81172,     +12.05403,      50.81568,      +12.05995,  3327937.36,  2361240.24,  4989599.29,      50.909664,       -3.156955,   80325.09,  106635.94,   15536.62,            15543.04,  -330.78,  29525.60,           27627.45,     -1.02,     11.36,          22.06,  +2.02,  +1.88
 15,     UK000T,       0,  0.601220, 2459486.584597276524,  51.17685,  11.94933,              155.72577,  48.32961,       155.71537,       48.34148,     51.17685,     +11.94933,      51.18300,      +11.96260,  3326997.20,  2361155.99,  4989274.16,      50.913463,       -3.150447,   79558.35,  105922.21,   16534.97,            16541.39,  -501.74,  24901.49,           27600.59,     -2.27,     25.29,          49.45,  +2.38,  +2.26
 16,     UK000T,       1,  0.641344, 2459486.584597741254,  51.54003,  11.82143,              155.26194,  48.11244,       155.22863,       48.15005,     51.54003,     +11.82143,      51.55436,      +11.86361,  3326058.61,  2361071.87,  4988949.58,      50.917256,       -3.143948,   78792.94,  105214.16,   17531.65,            17538.07,  -675.31,  24840.03,           27527.97,     -7.23,     79.91,         157.30,  +6.17,  +6.06
  0,     UK003Z,       0,  0.139829, 2459486.584591882769, 337.62801,  24.01943,              262.23975,  37.60912,       262.24463,       37.61420,    337.62801,     +24.01943,     337.62927,      +24.02578,  3339530.80,  2362279.22,  4993608.49,      50.862855,       -3.237273,   89783.90,  145330.70,       0.00,             3232.03,  -354.23,      0.00,           30155.27,     -4.25,     15.62,          22.97,  +4.15,  +3.34
  1,     UK003Z,       0,  0.179961, 2459486.584592347033, 337.40860,  24.03816,              262.44056,  37.48599,       262.44502,       37.49062,    337.40860,     +24.03816,     337.40996,      +24.04396,  3338455.33,  2362182.84,  4993236.58,      50.867194,       -3.229842,   88906.12,  144314.50,    1142.03,             4374.06,  -382.68,  28456.88,           30155.27,     -3.86,     14.18,          21.00,  +3.03,  +2.23
  2,     UK003Z,       0,  0.220109, 2459486.584592811763, 337.16076,  24.05755,              262.66534,  37.34554,       262.67054,       37.35092,    337.16076,     +24.05755,     337.16238,      +24.06431,  3337258.13,  2362075.55,  4992822.56,      50.872025,       -3.221547,   87929.07,  143184.35,    2413.34,             5645.36,  -282.33,  31665.49,           30155.27,     -4.46,     16.37,          24.43,  +2.74,  +1.96
  3,     UK003Z,       0,  0.260245, 2459486.584593276493, 336.92394,  24.08016,              262.88310,  37.21422,       262.88553,       37.21672,    336.92394,     +24.08016,     336.92533,      +24.08330,  3336130.31,  2361974.48,  4992432.55,      50.876577,       -3.213738,   87008.72,  142122.31,    3610.96,             6842.99,  -255.31,  29839.14,           30155.27,     -2.06,      7.56,          11.38,  +2.91,  +2.15
  4,     UK003Z,       0,  0.300409, 2459486.584593741223, 336.66731,  24.08064,              263.09790,  37.05432,       263.11548,       37.07236,    336.66731,     +24.08064,     336.67086,      +24.10339,  3334937.74,  2361867.60,  4992020.13,      50.881390,       -3.205467,   86035.61,  141001.01,    4877.35,             8109.37,  -160.34,  31530.37,           30449.19,    -14.74,     54.25,          82.24,  +1.97,  +1.22
  5,     UK003Z,       0,  0.340545, 2459486.584594205953, 336.42748,  24.10984,              263.32278,  36.92577,       263.33208,       36.93529,    336.42748,     +24.10984,     336.43009,      +24.12187,  3333827.66,  2361768.12,  4991636.25,      50.885872,       -3.197776,   85129.88,  139960.04,    6056.13,             9288.16,  -152.15,  29369.80,           30378.97,     -7.74,     28.47,          43.48,  +2.17,  +1.44
  6,     UK003Z,       0,  0.380701, 2459486.584594670683, 336.15331,  24.13690,              263.57379,  36.77413,       263.57829,       36.77872,    336.15331,     +24.13690,     336.15545,      +24.14272,  3332580.25,  2361656.33,  4991204.88,      50.890909,       -3.189109,   84112.22,  138791.65,    7380.75,            10612.77,     1.27,  32986.67,           30633.38,     -3.71,     13.64,          21.01,  +2.12,  +1.41
  7,     UK003Z,       0,  0.420861, 2459486.584595135413, 335.88987,  24.14888,              263.80237,  36.61811,       263.81259,       36.62850,    335.88987,     +24.14888,     335.89288,      +24.16207,  3331407.96,  2361551.27,  4990799.48,      50.895643,       -3.180969,   83155.90,  137696.64,    8625.60,            11857.63,    74.83,  30997.40,           30769.72,     -8.35,     30.71,          47.67,  +2.20,  +1.51
  8,     UK003Z,       0,  0.461009, 2459486.584595600143, 335.62632,  24.17745,              264.04462,  36.47401,       264.04743,       36.47686,    335.62632,     +24.17745,     335.62856,      +24.18107,  3330246.88,  2361447.22,  4990397.96,      50.900333,       -3.172904,   82208.82,  136614.61,    9858.54,            13090.57,   136.81,  30709.88,           30829.34,     -2.27,      8.36,          13.08,  +2.16,  +1.48
  9,     UK003Z,       0,  0.501161, 2459486.584596064873, 335.36657,  24.19822,              264.27648,  36.32655,       264.27727,       36.32734,    335.36657,     +24.19822,     335.36874,      +24.19923,  3329123.84,  2361346.57,  4990009.59,      50.904870,       -3.165105,   81292.84,  135570.68,   11051.09,            14283.12,   158.30,  29700.93,           30798.14,     -0.63,      2.32,           3.66,  +2.06,  +1.40
 10,     UK003Z,       0,  0.541309, 2459486.584596529603, 335.12505,  24.20710,              264.48268,  36.18179,       264.48920,       36.18835,    335.12505,     +24.20710,     335.12805,      +24.21549,  3328099.94,  2361254.81,  4989655.51,      50.909007,       -3.158007,   80457.76,  134621.79,   12138.36,            15370.39,    74.62,  27081.54,           30612.19,     -5.18,     19.07,          30.27,  +2.07,  +1.42
 11,     UK003Z,       0,  0.581445, 2459486.584596993867, 334.86698,  24.25117,              264.73188,  36.05217,       264.71758,       36.03777,    334.86698,     +24.25117,     334.86776,      +24.23277,  3327008.22,  2361156.98,  4989277.98,      50.913418,       -3.150423,   79567.46,  133611.63,   13297.66,            16529.68,    63.31,  28884.11,           30438.47,     11.32,    -41.55,          66.48,  +2.55,  +1.92
 12,     UK003Z,       0,  0.621621, 2459486.584597459063, 334.58995,  24.24512,              264.95344,  35.87418,       264.95770,       35.87845,    334.58995,     +24.24512,     334.59300,      +24.25060,  3325873.32,  2361055.27,  4988885.51,      50.918005,       -3.142529,   78642.02,  132563.64,   14502.80,            17734.83,    96.68,  29996.64,           30318.89,     -3.33,     12.26,          19.77,  +2.24,  +1.63
 13,     UK003Z,       0,  0.661789, 2459486.584597923793, 334.28064,  24.28484,              265.23952,  35.70912,       265.22828,       35.69788,    334.28064,     +24.28484,     334.28218,      +24.27040,  3324609.90,  2360942.04,  4988448.60,      50.923113,       -3.133718,   77611.90,  131398.93,   15844.43,            19076.45,   266.77,  33400.33,           30331.82,      8.72,    -32.04,          52.12,  +3.01,  +2.42
 14,     UK003Z,       1,  0.701889, 2459486.584598388057, 334.03383,  24.38081,              265.52164,  35.62396,       265.44766,       35.54991,    334.03383,     +24.38081,     334.02869,      +24.28568,  3323598.13,  2360851.37,  4988098.71,      50.927203,       -3.126691,   76786.98,  130470.44,   16918.81,            20150.84,   171.61,  26792.68,           30251.86,     57.49,   -209.54,         343.50,  +5.25,  +4.67

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.