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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
nu = -18.984 degreesThe 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.
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.
_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 43.999The stations U1, U2, U3 and U4 are occupied by the unit telescopes.
Note that due to restrictions of the delay lines and optical feed paths, not every arbitrary pair of stations may be chosen.
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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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