VLTI Station Position Technical Data |
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The physical location of the array centre is defined as follows:
Longitude: -70.40479659 degrees Latitude: -24.62794830 degrees
Each station is allocated an letter-digit identifier for easier
specification, e.g. "A1".
The following data is the station identifier, plus the coordinates of that
station in the reference frame of the rotated platform, followed by the
coordinates of the station as per an East-North grid, all specified in
metres.
Note that due to restrictions of the delay lines and optical feed paths,
not every arbitrary pair of stations may be chosen.
Station Position Coordinates
Following is a list of the station platform coordinates. The
platform coordinates (p,q) are rotated from the geographic
grid coordinates (e,n). This platform rotation, nu,
defined as a clockwise rotation from geometric north (i.e. east =
+90 degrees), is:
nu = -18.984 degrees
The geographic coordinates may be derived by rotating the
(p,q) coordinates:
e = p * cos(nu) + q * sin(nu)
n = q * cos(nu) - p * sin(nu)
where positive e is defined as the distance to the geometric east
of the array centre and positive n is defined as the distance to
the geometric north of the array centre.
_ID_______P__________Q__________E__________N____
A0 -32.001 -48.013 -14.642 -55.812
A1 -32.001 -64.021 -9.434 -70.949
B0 -23.991 -48.019 -7.065 -53.212
B1 -23.991 -64.011 -1.863 -68.334
B2 -23.991 -72.011 0.739 -75.899
B3 -23.991 -80.029 3.348 -83.481
B4 -23.991 -88.013 5.945 -91.030
B5 -23.991 -96.012 8.547 -98.594
C0 -16.002 -48.013 0.487 -50.607
C1 -16.002 -64.011 5.691 -65.735
C2 -16.002 -72.019 8.296 -73.307
C3 -16.002 -80.010 10.896 -80.864
D0 0.010 -48.012 15.628 -45.397
D1 0.010 -80.015 26.039 -75.660
D2 0.010 -96.012 31.243 -90.787
E0 16.011 -48.016 30.760 -40.196
G0 32.017 -48.0172 45.896 -34.990
G1 32.020 -112.010 66.716 -95.501
G2 31.995 -24.003 38.063 -12.289
H0 64.015 -48.007 76.150 -24.572
I1 72.001 -87.997 96.711 -59.789
J1 88.016 -71.992 106.648 -39.444
J2 88.016 -96.005 114.460 -62.151
J3 88.016 7.996 80.628 36.193
J4 88.016 23.993 75.424 51.320
J5 88.016 47.987 67.618 74.009
J6 88.016 71.990 59.810 96.706
K0 96.002 -48.006 106.397 -14.165
L0 104.021 -47.998 113.977 -11.549
M0 112.013 -48.000 121.535 -8.951
U1 -16.000 -16.000 -9.925 -20.335
U2 24.000 24.000 14.887 30.502
U3 64.0013 47.9725 44.915 66.183
U4 112.000 8.000 103.306 43.999
The stations U1, U2, U3 and U4 are
occupied by the unit telescopes.
Station Map
Click on the image icon to see the large-scale version (72kbytes) of the map displaying the station positions at the Paranal Observatory site. |
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