MDM Observatory's 8K CCD array project:
FILTERS FOR THE 8K CCD ARRAY e-mail: arlin@astro.columbia.edu Telephone: (212) 854-7899 |
The initial complement of filters planned are primarily based on the KPNO Harris set, and close to Johnson U, Johnson B, Johnson V, Johnson R and Kron-Cousins I, along with an extended Cousins R (R_jt) used by the VATT/Columbia and MEGA projects to study microlensing in M31. The filters must have a minimum active region of 5.5 inches (squares) in order to avoid vignetting. The filters are 5.75 inch (square) in order to be directly compatible with KPNO/MOSAIC. These are close to parfocal, and close to consistent with focus for KPNO/MOSAIC filters. Tabulated values and plots of the filter transmission curves are shown below. They do not include the other factors in the system response.
Filter Transmission Curves:
U /
B /
V /
R /
I (preliminary) /
Z /
R_jt /
H-alpha (on-band) /
H-alpha (off-band)
Tabulated Transmission Curves (preliminary):
Wavelength | U | B | V | R | I | R_jt |
(Angstroms) | % | % | % | % | % | % |
3000 | 0.35 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
3050 | 3.34 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
3100 | 13.40 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
3150 | 30.95 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
3200 | 49.76 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
3250 | 64.56 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
3300 | 75.57 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
3350 | 80.57 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
3400 | 84.72 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
3450 | 86.50 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |
3500 | 87.51 | 0.02 | 0.00 | 0.00 | 0.00 | 0.00 |
3550 | 86.51 | 0.40 | 0.00 | 0.00 | 0.00 | 0.00 |
3600 | 85.17 | 1.94 | 0.00 | 0.00 | 0.00 | 0.00 |
3650 | 83.42 | 5.28 | 0.00 | 0.00 | 0.00 | 0.00 |
3700 | 77.65 | 10.47 | 0.00 | 0.00 | 0.00 | 0.00 |
3750 | 70.44 | 17.09 | 0.00 | 0.00 | 0.00 | 0.00 |
3800 | 59.17 | 24.68 | 0.00 | 0.00 | 0.00 | 0.00 |
3850 | 43.31 | 32.54 | 0.00 | 0.00 | 0.00 | 0.00 |
3900 | 26.40 | 40.17 | 0.00 | 0.00 | 0.00 | 0.00 |
3950 | 12.19 | 46.99 | 0.00 | 0.00 | 0.00 | 0.00 |
4000 | 4.22 | 52.83 | 0.00 | 0.00 | 0.00 | 0.00 |
4050 | 1.15 | 57.49 | 0.00 | 0.00 | 0.00 | 0.00 |
4100 | 0.26 | 61.30 | 0.00 | 0.00 | 0.00 | 0.00 |
4150 | 0.03 | 64.22 | 0.00 | 0.00 | 0.00 | 0.00 |
4200 | 0.00 | 66.52 | 0.00 | 0.00 | 0.00 | 0.00 |
4250 | 0.00 | 67.99 | 0.00 | 0.00 | 0.00 | 0.00 |
4300 | 0.00 | 68.86 | 0.00 | 0.00 | 0.00 | 0.00 |
4350 | 0.00 | 69.24 | 0.00 | 0.00 | 0.00 | 0.00 |
4400 | 0.00 | 69.27 | 0.00 | 0.00 | 0.00 | 0.00 |
4450 | 0.00 | 68.85 | 0.00 | 0.00 | 0.00 | 0.00 |
4500 | 0.00 | 67.59 | 0.00 | 0.00 | 0.00 | 0.00 |
4550 | 0.00 | 66.18 | 0.00 | 0.00 | 0.00 | 0.00 |
4600 | 0.00 | 64.01 | 0.00 | 0.00 | 0.00 | 0.00 |
4650 | 0.00 | 60.64 | 0.00 | 0.00 | 0.00 | 0.00 |
4700 | 0.00 | 55.49 | 0.00 | 0.00 | 0.00 | 0.00 |
4750 | 0.00 | 49.25 | 0.00 | 0.00 | 0.00 | 0.00 |
4800 | 0.00 | 42.46 | 0.55 | 0.00 | 0.00 | 0.00 |
4850 | 0.00 | 35.29 | 13.03 | 0.00 | 0.00 | 0.00 |
4900 | 0.00 | 28.65 | 45.12 | 0.00 | 0.00 | 0.00 |
4950 | 0.00 | 23.28 | 69.44 | 0.00 | 0.00 | 0.00 |
5000 | 0.00 | 19.12 | 80.85 | 0.00 | 0.00 | 0.00 |
5050 | 0.00 | 14.59 | 85.66 | 0.00 | 0.00 | 0.00 |
5100 | 0.00 | 10.47 | 87.62 | 0.00 | 0.00 | 0.00 |
5150 | 0.00 | 7.49 | 88.31 | 0.00 | 0.00 | 0.00 |
5200 | 0.00 | 5.02 | 88.35 | 0.00 | 0.00 | 0.00 |
5250 | 0.00 | 3.17 | 87.84 | 0.00 | 0.00 | 0.00 |
5300 | 0.00 | 2.03 | 86.93 | 0.00 | 0.00 | 0.00 |
5350 | 0.00 | 1.47 | 85.58 | 0.00 | 0.00 | 0.00 |
5400 | 0.00 | 1.26 | 83.72 | 0.00 | 0.00 | 0.03 |
5450 | 0.00 | 1.29 | 81.36 | 0.00 | 0.00 | 0.10 |
5500 | 0.00 | 1.59 | 78.46 | 0.11 | 0.00 | 0.25 |
5550 | 0.00 | 2.06 | 74.95 | 1.13 | 0.00 | 0.80 |
5600 | 0.00 | 2.26 | 70.82 | 7.99 | 0.00 | 3.30 |
5650 | 0.00 | 2.00 | 66.17 | 27.39 | 0.00 | 18.20 |
5700 | 0.00 | 1.43 | 60.98 | 51.75 | 0.00 | 34.40 |
5750 | 0.00 | 0.80 | 55.40 | 69.43 | 0.00 | 53.10 |
5800 | 0.00 | 0.36 | 49.51 | 79.15 | 0.00 | 62.80 |
5850 | 0.00 | 0.14 | 43.52 | 83.75 | 0.00 | 68.10 |
5900 | 0.00 | 0.07 | 37.51 | 85.61 | 0.00 | 72.00 |
5950 | 0.00 | 0.05 | 31.72 | 86.16 | 0.00 | 76.10 |
6000 | 0.00 | 0.05 | 26.29 | 85.95 | 0.00 | 82.20 |
6050 | 0.00 | 0.00 | 21.31 | 85.29 | 0.00 | 86.30 |
6100 | 0.00 | 0.00 | 16.90 | 84.44 | 0.00 | 92.30 |
6150 | 0.00 | 0.00 | 13.10 | 83.32 | 0.00 | 95.60 |
6200 | 0.00 | 0.00 | 9.93 | 82.07 | 0.00 | 95.80 |
6250 | 0.00 | 0.00 | 7.34 | 80.74 | 0.00 | 95.20 |
6300 | 0.00 | 0.00 | 5.31 | 79.21 | 0.00 | 94.40 |
6350 | 0.00 | 0.00 | 3.75 | 77.63 | 0.00 | 94.10 |
6400 | 0.00 | 0.00 | 2.58 | 75.95 | 0.00 | 94.80 |
6450 | 0.00 | 0.00 | 1.74 | 74.25 | 0.00 | 95.50 |
6500 | 0.00 | 0.00 | 1.14 | 72.49 | 0.00 | 95.10 |
6550 | 0.00 | 0.00 | 0.73 | 70.65 | 0.00 | 93.70 |
6600 | 0.00 | 0.00 | 0.46 | 68.79 | 0.00 | 91.20 |
6650 | 0.00 | 0.00 | 0.28 | 66.90 | 0.00 | 88.90 |
6700 | 0.00 | 0.00 | 0.17 | 64.96 | 0.00 | 87.50 |
6750 | 0.00 | 0.00 | 0.10 | 62.93 | 0.00 | 87.80 |
6800 | 0.00 | 0.00 | 0.05 | 60.72 | 0.00 | 89.30 |
6850 | 0.00 | 0.00 | 0.03 | 58.51 | 0.00 | 92.10 |
6900 | 0.00 | 0.00 | 0.01 | 56.21 | 0.00 | 95.80 |
6950 | 0.00 | 0.00 | 0.00 | 53.85 | 0.06 | 97.60 |
7000 | 0.00 | 0.00 | 0.00 | 51.58 | 0.22 | 93.90 |
7050 | 0.00 | 0.00 | 0.00 | 49.23 | 1.61 | 81.90 |
7100 | 0.00 | 0.00 | 0.00 | 46.94 | 6.17 | 60.80 |
7150 | 0.00 | 0.00 | 0.00 | 44.69 | 15.48 | 40.30 |
7200 | 0.00 | 0.00 | 0.00 | 42.39 | 28.68 | 24.80 |
7250 | 0.00 | 0.00 | 0.00 | 40.22 | 43.17 | 15.10 |
7300 | 0.00 | 0.00 | 0.00 | 38.07 | 55.88 | 9.40 |
7350 | 0.00 | 0.00 | 0.00 | 35.86 | 66.16 | 6.00 |
7400 | 0.00 | 0.00 | 0.00 | 33.80 | 74.67 | 3.90 |
7450 | 0.00 | 0.00 | 0.00 | 31.71 | 81.57 | 2.80 |
7500 | 0.00 | 0.00 | 0.00 | 29.73 | 86.96 | 2.10 |
7550 | 0.00 | 0.00 | 0.00 | 27.76 | 89.65 | 1.60 |
7600 | 0.00 | 0.00 | 0.00 | 25.82 | 90.47 | 1.10 |
7650 | 0.00 | 0.00 | 0.00 | 24.00 | 90.87 | 0.70 |
7700 | 0.00 | 0.00 | 0.00 | 22.27 | 91.94 | 0.60 |
7750 | 0.00 | 0.00 | 0.00 | 20.60 | 93.14 | 0.50 |
7800 | 0.00 | 0.00 | 0.00 | 18.96 | 93.65 | 0.40 |
7850 | 0.00 | 0.00 | 0.00 | 17.46 | 93.66 | 0.20 |
7900 | 0.00 | 0.00 | 0.00 | 16.00 | 92.78 | 0.20 |
7950 | 0.00 | 0.00 | 0.00 | 14.67 | 91.64 | 0.10 |
8000 | 0.00 | 0.00 | 0.00 | 13.37 | 91.44 | 0.10 |
8050 | 0.00 | 0.00 | 0.00 | 12.19 | 91.76 | 0.10 |
8100 | 0.00 | 0.00 | 0.00 | 11.09 | 93.02 | 0.00 |
8150 | 0.00 | 0.00 | 0.00 | 10.12 | 93.16 | 0.00 |
8200 | 0.00 | 0.00 | 0.00 | 9.17 | 93.10 | 0.00 |
8250 | 0.00 | 0.00 | 0.00 | 8.26 | 92.04 | 0.00 |
8300 | 0.00 | 0.00 | 0.00 | 7.48 | 91.80 | 0.00 |
8350 | 0.00 | 0.00 | 0.00 | 6.73 | 91.69 | 0.00 |
8400 | 0.00 | 0.00 | 0.00 | 6.03 | 91.58 | 0.00 |
8450 | 0.00 | 0.00 | 0.00 | 5.41 | 91.97 | 0.00 |
8500 | 0.00 | 0.00 | 0.00 | 4.89 | 91.67 | 0.00 |
8550 | 0.00 | 0.00 | 0.00 | 4.41 | 90.16 | 0.00 |
8600 | 0.00 | 0.00 | 0.00 | 3.90 | 90.06 | 0.00 |
8650 | 0.00 | 0.00 | 0.00 | 3.60 | 90.95 | 0.00 |
8700 | 0.00 | 0.00 | 0.00 | 3.22 | 90.61 | 0.00 |
8750 | 0.00 | 0.00 | 0.00 | 2.89 | 89.67 | 0.00 |
8800 | 0.00 | 0.00 | 0.00 | 2.58 | 88.16 | 0.00 |
8850 | 0.00 | 0.00 | 0.00 | 2.29 | 87.08 | 0.00 |
8900 | 0.00 | 0.00 | 0.00 | 2.05 | 86.81 | 0.00 |
8950 | 0.00 | 0.00 | 0.00 | 1.81 | 86.30 | 0.00 |
9000 | 0.00 | 0.00 | 0.00 | 1.62 | 82.25 | 0.00 |
9050 | 0.00 | 0.00 | 0.00 | 1.45 | 73.85 | 0.00 |
9100 | 0.00 | 0.00 | 0.00 | 1.30 | 65.60 | 0.00 |
9150 | 0.00 | 0.00 | 0.00 | 1.16 | 59.55 | 0.00 |
9200 | 0.00 | 0.00 | 0.00 | 1.02 | 43.10 | 0.00 |
9250 | 0.00 | 0.00 | 0.00 | 0.94 | 17.00 | 0.00 |
9300 | 0.00 | 0.00 | 0.00 | 0.83 | 4.50 | 0.00 |
9350 | 0.00 | 0.00 | 0.00 | 0.77 | 1.25 | 0.00 |
9400 | 0.00 | 0.00 | 0.00 | 0.65 | 0.40 | 0.00 |
9450 | 0.00 | 0.00 | 0.00 | 0.61 | 0.13 | 0.00 |
9500 | 0.00 | 0.00 | 0.00 | 0.56 | 0.06 | 0.00 |
9550 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 |