Bandpass of photometric system
| Wavelength[Å] |
U | B | V | R | I |
| 3000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| 3050 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| 3100 | 0.0001 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| 3150 | 0.0036 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| 3200 | 0.0218 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| 3250 | 0.0732 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| 3300 | 0.1641 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| 3350 | 0.2873 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| 3400 | 0.4298 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| 3450 | 0.5703 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| 3500 | 0.6956 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| 3550 | 0.8025 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| 3600 | 0.8959 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| 3650 | 0.9534 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| 3700 | 0.9909 | 0.0029 | 0.0000 | 0.0000 | 0.0000 |
| 3750 | 0.9969 | 0.0193 | 0.0000 | 0.0000 | 0.0000 |
| 3800 | 0.9403 | 0.0654 | 0.0000 | 0.0000 | 0.0000 |
| 3850 | 0.7815 | 0.1466 | 0.0000 | 0.0000 | 0.0000 |
| 3900 | 0.5385 | 0.2569 | 0.0000 | 0.0000 | 0.0000 |
| 3950 | 0.2738 | 0.3834 | 0.0000 | 0.0000 | 0.0000 |
| 4000 | 0.0891 | 0.5090 | 0.0000 | 0.0000 | 0.0000 |
| 4050 | 0.0166 | 0.6274 | 0.0000 | 0.0000 | 0.0000 |
| 4100 | 0.0016 | 0.7318 | 0.0000 | 0.0000 | 0.0000 |
| 4150 | 0.0000 | 0.8130 | 0.0000 | 0.0000 | 0.0000 |
| 4200 | 0.0000 | 0.8831 | 0.0000 | 0.0000 | 0.0000 |
| 4250 | 0.0000 | 0.9312 | 0.0000 | 0.0000 | 0.0000 |
| 4300 | 0.0000 | 0.9624 | 0.0000 | 0.0000 | 0.0000 |
| 4350 | 0.0000 | 0.9843 | 0.0000 | 0.0000 | 0.0000 |
| 4400 | 0.0000 | 0.9969 | 0.0000 | 0.0000 | 0.0000 |
| 4450 | 0.0000 | 0.9964 | 0.0000 | 0.0000 | 0.0000 |
| 4500 | 0.0000 | 0.9749 | 0.0000 | 0.0000 | 0.0000 |
| 4550 | 0.0000 | 0.9496 | 0.0000 | 0.0000 | 0.0000 |
| 4600 | 0.0000 | 0.8998 | 0.0000 | 0.0000 | 0.0000 |
| 4650 | 0.0000 | 0.8232 | 0.0000 | 0.0000 | 0.0000 |
| 4700 | 0.0000 | 0.7105 | 0.0000 | 0.0000 | 0.0000 |
| 4750 | 0.0000 | 0.5791 | 0.0001 | 0.0000 | 0.0000 |
| 4800 | 0.0000 | 0.4454 | 0.0010 | 0.0000 | 0.0000 |
| 4850 | 0.0000 | 0.3212 | 0.0087 | 0.0000 | 0.0000 |
| 4900 | 0.0000 | 0.2197 | 0.0472 | 0.0000 | 0.0000 |
| 4950 | 0.0000 | 0.1481 | 0.1623 | 0.0000 | 0.0000 |
| 5000 | 0.0000 | 0.1024 | 0.3623 | 0.0000 | 0.0000 |
| 5050 | 0.0000 | 0.0631 | 0.5788 | 0.0000 | 0.0000 |
| 5100 | 0.0000 | 0.0344 | 0.7516 | 0.0000 | 0.0000 |
| 5150 | 0.0000 | 0.0184 | 0.8640 | 0.0000 | 0.0000 |
| 5200 | 0.0000 | 0.0087 | 0.9302 | 0.0000 | 0.0000 |
| 5250 | 0.0000 | 0.0036 | 0.9697 | 0.0000 | 0.0000 |
| 5300 | 0.0000 | 0.0016 | 0.9877 | 0.0000 | 0.0000 |
| 5350 | 0.0000 | 0.0008 | 0.9969 | 0.0000 | 0.0001 |
| 5400 | 0.0000 | 0.0006 | 0.9987 | 0.0000 | 0.0000 |
| 5450 | 0.0000 | 0.0004 | 0.9898 | 0.0000 | 0.0000 |
| 5500 | 0.0000 | 0.0007 | 0.9729 | 0.0000 | 0.0000 |
| 5550 | 0.0000 | 0.0014 | 0.9483 | 0.0000 | 0.0000 |
| 5600 | 0.0000 | 0.0019 | 0.9162 | 0.0000 | 0.0000 |
| 5650 | 0.0000 | 0.0018 | 0.8794 | 0.0000 | 0.0000 |
| 5700 | 0.0000 | 0.0010 | 0.8326 | 0.0000 | 0.0000 |
| 5750 | 0.0000 | 0.0004 | 0.7797 | 0.0000 | 0.0000 |
| 5800 | 0.0000 | 0.0000 | 0.7203 | 0.0000 | 0.0001 |
| 5850 | 0.0000 | 0.0000 | 0.6586 | 0.0000 | 0.0001 |
| 5900 | 0.0000 | 0.0000 | 0.5973 | 0.0000 | 0.0000 |
| 5950 | 0.0000 | 0.0000 | 0.5303 | 0.0000 | 0.0000 |
| 6000 | 0.0000 | 0.0000 | 0.4641 | 0.0000 | 0.0001 |
| 6050 | 0.0000 | 0.0000 | 0.4003 | 0.0000 | 0.0000 |
| 6100 | 0.0000 | 0.0000 | 0.3396 | 0.0000 | 0.0000 |
| 6150 | 0.0000 | 0.0000 | 0.2827 | 0.0000 | 0.0001 |
| 6200 | 0.0000 | 0.0000 | 0.2310 | 0.0003 | 0.0000 |
| 6250 | 0.0000 | 0.0000 | 0.1855 | 0.0012 | 0.0000 |
| 6300 | 0.0000 | 0.0000 | 0.1463 | 0.0061 | 0.0001 |
| 6350 | 0.0000 | 0.0000 | 0.1136 | 0.0306 | 0.0000 |
| 6400 | 0.0000 | 0.0000 | 0.0865 | 0.1257 | 0.0000 |
| 6450 | 0.0000 | 0.0000 | 0.0649 | 0.3183 | 0.0001 |
| 6500 | 0.0000 | 0.0000 | 0.0479 | 0.5247 | 0.0001 |
| 6550 | 0.0000 | 0.0000 | 0.0344 | 0.6806 | 0.0000 |
| 6600 | 0.0000 | 0.0000 | 0.0244 | 0.7833 | 0.0001 |
| 6650 | 0.0000 | 0.0000 | 0.0171 | 0.8520 | 0.0001 |
| 6700 | 0.0000 | 0.0000 | 0.0116 | 0.8978 | 0.0000 |
| 6750 | 0.0000 | 0.0000 | 0.0079 | 0.9355 | 0.0001 |
| 6800 | 0.0002 | 0.0001 | 0.0053 | 0.9603 | 0.0003 |
| 6850 | 0.0010 | 0.0005 | 0.0035 | 0.9758 | 0.0001 |
| 6900 | 0.0029 | 0.0012 | 0.0022 | 0.9853 | 0.0003 |
| 6950 | 0.0058 | 0.0023 | 0.0014 | 0.9897 | 0.0005 |
| 7000 | 0.0092 | 0.0033 | 0.0009 | 0.9867 | 0.0005 |
| 7050 | 0.0123 | 0.0041 | 0.0005 | 0.9824 | 0.0006 |
| 7100 | 0.0142 | 0.0045 | 0.0003 | 0.9774 | 0.0008 |
| 7150 | 0.0149 | 0.0047 | 0.0002 | 0.9718 | 0.0010 |
| 7200 | 0.0143 | 0.0046 | 0.0001 | 0.9699 | 0.0014 |
| 7250 | 0.0133 | 0.0045 | 0.0000 | 0.9780 | 0.0017 |
| 7300 | 0.0125 | 0.0042 | 0.0000 | 0.9891 | 0.0022 |
| 7350 | 0.0119 | 0.0040 | 0.0000 | 0.9998 | 0.0029 |
| 7400 | 0.0109 | 0.0037 | 0.0000 | 0.9893 | 0.0041 |
| 7450 | 0.0094 | 0.0034 | 0.0000 | 0.9347 | 0.0056 |
| 7500 | 0.0076 | 0.0032 | 0.0000 | 0.8161 | 0.0079 |
| 7550 | 0.0058 | 0.0031 | 0.0000 | 0.6513 | 0.0117 |
| 7600 | 0.0042 | 0.0029 | 0.0000 | 0.4783 | 0.0180 |
| 7650 | 0.0029 | 0.0027 | 0.0000 | 0.3342 | 0.0278 |
| 7700 | 0.0019 | 0.0026 | 0.0000 | 0.2308 | 0.0443 |
| 7750 | 0.0014 | 0.0025 | 0.0000 | 0.1573 | 0.0709 |
| 7800 | 0.0011 | 0.0024 | 0.0000 | 0.1095 | 0.1116 |
| 7850 | 0.0009 | 0.0023 | 0.0000 | 0.0772 | 0.1703 |
| 7900 | 0.0007 | 0.0022 | 0.0000 | 0.0561 | 0.2500 |
| 7950 | 0.0006 | 0.0022 | 0.0000 | 0.0416 | 0.3493 |
| 8000 | 0.0004 | 0.0022 | 0.0000 | 0.0315 | 0.4631 |
| 8050 | 0.0002 | 0.0021 | 0.0000 | 0.0242 | 0.5820 |
| 8100 | 0.0000 | 0.0021 | 0.0000 | 0.0192 | 0.6958 |
| 8150 | 0.0000 | 0.0021 | 0.0000 | 0.0153 | 0.7922 |
| 8200 | 0.0000 | 0.0021 | 0.0000 | 0.0125 | 0.8695 |
| 8250 | 0.0000 | 0.0021 | 0.0000 | 0.0103 | 0.9284 |
| 8300 | 0.0176 | 0.0000 | 0.0000 | 0.0089 | 0.9621 |
| 8350 | 0.0318 | 0.0000 | 0.0000 | 0.0095 | 0.9821 |
| 8400 | 0.0266 | 0.0000 | 0.0000 | 0.0113 | 0.9896 |
| 8450 | 0.0146 | 0.0000 | 0.0011 | 0.0268 | 0.9994 |
| 8500 | 0.0135 | 0.0000 | 0.0018 | 0.0121 | 0.9915 |
| 8550 | 0.0194 | 0.0000 | 0.0003 | 0.0046 | 0.9751 |
| 8600 | 0.0278 | 0.0000 | 0.0024 | 0.0037 | 0.9617 |
| 8650 | 0.0260 | 0.0000 | 0.0043 | 0.0140 | 0.9457 |
| 8700 | 0.0199 | 0.0000 | 0.0037 | 0.0056 | 0.9215 |
| 8750 | 0.0177 | 0.0000 | 0.0040 | 0.0065 | 0.9071 |
| 8800 | 0.0135 | 0.0000 | 0.0019 | 0.0038 | 0.8835 |
| 8850 | 0.0165 | 0.0000 | 0.0000 | 0.0027 | 0.8644 |
| 8900 | 0.0116 | 0.0000 | 0.0002 | 0.0034 | 0.8334 |
| 8950 | 0.0095 | 0.0037 | 0.0004 | 0.0043 | 0.7959 |
| 9000 | 0.0118 | 0.0017 | 0.0002 | 0.0030 | 0.7707 |
| 9050 | 0.0107 | 0.0008 | 0.0004 | 0.0045 | 0.7525 |
| 9100 | 0.0072 | 0.0011 | 0.0013 | 0.0069 | 0.7463 |
| 9150 | 0.0052 | 0.0000 | 0.0016 | 0.0029 | 0.7163 |
| 9200 | 0.0052 | 0.0000 | 0.0010 | 0.0011 | 0.6765 |
| 9250 | 0.0040 | 0.0000 | 0.0000 | 0.0037 | 0.6539 |
| 9300 | 0.0034 | 0.0011 | 0.0001 | 0.0020 | 0.6175 |
| 9350 | 0.0040 | 0.0020 | 0.0001 | 0.0028 | 0.5836 |
| 9400 | 0.0039 | 0.0020 | 0.0000 | 0.0026 | 0.5631 |
| 9450 | 0.0036 | 0.0028 | 0.0001 | 0.0020 | 0.5289 |
| 9500 | 0.0035 | 0.0026 | 0.0000 | 0.0020 | 0.4941 |
| 9550 | 0.0032 | 0.0026 | 0.0000 | 0.0019 | 0.4582 |
| 9600 | 0.0022 | 0.0036 | 0.0004 | 0.0024 | 0.4299 |
| 9650 | 0.0023 | 0.0035 | 0.0001 | 0.0026 | 0.4049 |
| 9700 | 0.0018 | 0.0026 | 0.0001 | 0.0021 | 0.3830 |
| 9750 | 0.0015 | 0.0032 | 0.0003 | 0.0028 | 0.3633 |
| 9800 | 0.0013 | 0.0029 | 0.0003 | 0.0033 | 0.3391 |
| 9850 | 0.0012 | 0.0028 | 0.0000 | 0.0035 | 0.3207 |
| 9900 | 0.0011 | 0.0031 | 0.0000 | 0.0041 | 0.3058 |
| 9950 | 0.0013 | 0.0034 | 0.0001 | 0.0047 | 0.2981 |
| 10000 | 0.0009 | 0.0035 | 0.0000 | 0.0046 | 0.2913 |
| 10050 | 0.0011 | 0.0035 | 0.0000 | 0.0053 | 0.2789 |
| 10100 | 0.0012 | 0.0034 | 0.0000 | 0.0060 | 0.2612 |
| 10150 | 0.0014 | 0.0036 | 0.0001 | 0.0071 | 0.2428 |
| 10200 | 0.0012 | 0.0035 | 0.0001 | 0.0078 | 0.2307 |
| 10250 | 0.0006 | 0.0035 | 0.0001 | 0.0096 | 0.2220 |
| 10300 | 0.0007 | 0.0034 | 0.0001 | 0.0117 | 0.2067 |
| 10350 | 0.0007 | 0.0034 | 0.0002 | 0.0139 | 0.1913 |
| 10400 | 0.0006 | 0.0034 | 0.0002 | 0.0169 | 0.1764 |
| 10450 | 0.0005 | 0.0033 | 0.0001 | 0.0212 | 0.1640 |
| 10500 | 0.0005 | 0.0033 | 0.0001 | 0.0265 | 0.1489 |
| 10550 | 0.0008 | 0.0031 | 0.0001 | 0.0337 | 0.1368 |
| 10600 | 0.0007 | 0.0030 | 0.0001 | 0.0425 | 0.1249 |
FIGURE
PHOTOMETER
| The photometer head mounted 30cm telescope |
Interior view of photometer head |
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The current output from the photodiode is very small, so the current is amplified by a factor of 1010 and then amplified accordingly to the brightness of the photometric target and recorded numerically. The time constant of the circuit is 0.3 seconds. Three different diaphragms (1 mm/0.7', 1.5 mm/1.1' and 2.2 mm/1.6') were prepared and used according to the seeing. Normally, 1.5 mm diaphragms were used, but in cases of poor seeing, the diaphragms were switched to 2.2 mm diaphragms. |
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| The A/D converter consists of a 12-bit TSC8702EHG (manufactured by National
Semiconductor) and acquires 15 data per second. I have createde two sets of the same photometer to prepare for accidents. |
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| Uog : TOSHIBA,UV-D35 + TOSHIBA,C-50S+ TOSHIBA,C-50S Bog : TOSHIBA,V-42 + HOYA,L40 V : TOSHIBA,Y-50 + HOYA,CM500S Rj : KENKO,R-65 + HOYA,CF Ij : KENKO,IR80 |
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