# Subaru Telescope Infrared Secondary Mirror In-Situ Measured Reflectivity # Coated with Silver on 2008-08-22 # Opened the vacuum chamber: No information # Measured with Subaru Portable Spectrophotometer (SPS) on 2019-08-20 (4015 days after) # Measured five times (#4 and #5 were the measurements at where the mirror looks clear and not so much degraded) # Data between 950 nm and 1650 nm are also available (SPS-XWW). # Contact: Hirofumi Okita (okita14@naoj.org) # # Wavelength (nm) #1 #2 #3 #4 #5 1000 79.06 78.17 79.03 96.63 95.98 998 79.61 78.54 78.74 96.25 96.86 996 80.06 78.75 78.67 96.50 96.47 994 79.01 79.05 78.18 95.76 96.15 992 80.16 78.58 79.19 95.87 95.78 990 79.97 78.44 79.78 96.04 96.62 988 79.20 79.02 78.82 95.78 96.14 986 79.69 78.05 79.43 96.77 95.95 984 78.92 78.27 79.97 96.58 96.62 982 79.58 77.84 79.86 96.90 96.08 980 79.30 78.94 78.54 96.58 96.23 978 79.20 77.79 78.50 95.95 96.26 976 78.77 78.31 78.84 95.81 96.37 974 78.72 78.24 78.57 96.19 96.34 972 78.78 77.61 78.06 95.86 96.60 970 78.84 78.05 78.29 96.22 95.76 968 79.09 77.50 78.24 95.97 96.27 966 78.69 76.63 78.06 96.25 95.79 964 78.42 77.23 77.87 95.93 96.31 962 78.36 77.36 78.00 95.83 95.67 960 78.44 77.11 78.94 95.97 96.09 958 77.85 77.14 78.23 96.10 96.24 956 78.23 77.18 78.32 96.24 96.33 954 78.28 76.50 77.76 96.08 96.59 952 77.48 76.91 77.75 96.26 96.10 950 77.38 77.00 76.72 95.81 96.21 948 77.43 76.68 77.18 95.59 96.34 946 77.39 76.48 77.39 96.02 96.22 944 77.30 75.84 76.71 96.18 95.98 942 76.99 75.33 76.67 96.09 96.81 940 76.93 75.52 76.07 96.07 96.09 938 77.04 75.60 76.59 95.77 96.14 936 76.62 74.85 76.11 96.03 96.03 934 76.45 75.19 76.32 96.36 96.14 932 76.06 75.28 76.29 96.03 96.08 930 75.55 74.91 75.48 95.77 96.22 928 76.29 74.89 75.60 95.31 95.85 926 75.55 74.83 75.44 95.81 95.66 924 75.63 74.47 75.07 95.71 95.90 922 75.12 74.05 75.03 96.14 95.87 920 75.44 73.84 75.02 95.74 96.04 918 75.35 73.56 74.72 95.59 96.09 916 74.95 73.65 74.76 96.02 96.36 914 74.44 73.40 73.85 95.05 95.68 912 74.29 73.23 74.03 95.95 96.00 910 74.21 72.75 73.65 95.97 96.15 908 74.09 72.63 73.58 95.62 95.72 906 74.09 72.50 73.56 95.72 96.14 904 73.48 72.31 73.62 95.78 95.88 902 73.51 72.08 72.81 95.66 95.96 900 73.29 71.69 72.84 95.65 96.07 898 73.19 71.65 72.78 95.79 95.72 896 72.90 71.69 72.51 95.69 96.06 894 72.99 71.45 72.38 95.73 95.81 892 72.89 70.89 72.00 95.75 96.12 890 72.65 71.34 71.99 95.76 96.18 888 72.29 70.56 71.79 95.52 96.00 886 71.83 70.49 71.55 95.94 95.73 884 71.86 70.44 71.00 95.71 95.85 882 71.70 70.06 71.17 95.59 95.82 880 71.55 69.99 70.93 95.21 95.87 878 71.35 69.41 70.61 95.80 95.78 876 70.89 69.41 70.40 95.48 96.37 874 70.71 69.00 70.46 95.44 96.05 872 70.59 68.73 70.07 95.25 95.78 870 69.91 68.77 69.82 95.52 95.34 868 70.33 68.73 69.64 95.60 95.65 866 70.06 68.32 69.58 95.32 95.49 864 69.80 68.05 69.05 95.39 95.80 862 69.81 67.77 68.95 95.55 95.44 860 69.35 67.57 68.82 95.22 95.48 858 68.89 67.43 68.43 95.46 95.27 856 68.78 67.24 68.24 95.19 96.11 854 68.38 66.95 68.18 95.24 95.38 852 68.14 66.96 67.98 95.30 95.64 850 68.13 66.30 67.49 94.94 95.81 848 67.81 66.01 67.48 95.28 95.46 846 67.46 65.96 66.84 95.28 95.12 844 67.38 65.73 66.78 95.13 95.33 842 67.06 65.43 66.64 95.61 94.91 840 66.58 65.26 66.35 95.31 95.50 838 66.91 65.21 65.98 95.09 95.62 836 66.21 64.81 65.74 95.55 95.47 834 65.93 64.33 65.51 95.19 95.65 832 65.67 64.60 65.53 95.07 95.56 830 66.01 64.40 65.00 94.82 95.34 828 65.63 63.84 64.74 94.85 94.97 826 65.23 63.68 64.58 94.38 95.68 824 65.24 63.45 64.51 94.47 95.31 822 64.95 63.16 64.05 95.29 95.41 820 64.64 62.82 64.08 95.21 94.82 818 64.48 62.91 63.98 95.10 95.25 816 64.23 62.01 63.49 94.95 95.00 814 63.92 61.92 63.22 94.95 95.60 812 63.63 61.65 63.04 94.86 95.17 810 63.42 61.58 62.58 94.95 94.77 808 62.93 61.78 62.69 94.56 94.91 806 62.62 61.06 62.02 94.79 94.71 804 62.57 60.91 62.23 94.76 95.04 802 62.21 60.78 61.75 94.50 94.89 800 61.87 60.22 61.37 94.80 94.82 798 61.67 60.00 61.34 94.94 94.61 796 61.23 59.76 61.04 94.78 94.72 794 61.27 59.51 60.85 94.90 94.83 792 61.07 59.24 60.64 94.21 94.80 790 60.63 58.96 60.35 94.49 95.42 788 60.34 58.95 60.16 94.45 94.53 786 60.38 58.26 59.74 94.42 94.78 784 60.01 58.06 59.70 94.62 94.73 782 59.86 58.03 59.28 94.31 94.47 780 59.46 57.94 59.34 94.10 94.53 778 59.22 57.52 58.64 94.37 94.86 776 59.23 57.22 58.36 94.21 94.65 774 58.85 57.05 58.44 94.20 94.40 772 58.79 56.48 57.82 94.20 94.49 770 58.29 56.37 57.72 94.15 94.43 768 58.20 56.26 57.80 94.19 94.63 766 57.86 56.01 57.26 93.90 94.22 764 57.49 55.72 57.22 94.10 94.13 762 57.03 55.39 56.86 93.92 94.14 760 56.94 55.19 56.59 93.99 94.36 758 56.67 54.77 56.16 93.80 93.81 756 56.37 54.60 56.04 93.82 94.10 754 56.28 54.33 55.78 93.71 94.14 752 55.93 53.96 55.50 93.88 94.09 750 55.59 53.68 55.16 93.78 93.76 748 55.56 53.50 54.78 93.71 94.06 746 55.07 53.08 54.57 93.65 93.84 744 54.79 52.99 54.47 93.41 93.90 742 54.60 52.93 54.35 93.57 93.99 740 54.39 52.32 54.06 93.57 93.89 738 53.99 52.29 53.73 93.42 93.72 736 53.69 51.88 53.31 93.52 93.76 734 53.54 51.65 53.25 93.39 93.91 732 53.32 51.29 52.84 93.26 93.75 730 53.21 51.32 52.94 93.31 93.65 728 52.81 50.89 52.37 93.37 93.73 726 52.56 50.66 52.22 93.41 93.70 724 52.21 50.41 51.91 93.16 93.56 722 51.91 50.30 51.67 93.23 93.26 720 52.01 49.90 51.44 93.20 93.27 718 51.54 49.67 51.14 93.11 93.14 716 51.26 49.32 50.90 92.96 93.28 714 51.00 49.02 50.70 92.90 93.37 712 50.80 48.78 50.46 93.00 93.47 710 50.43 48.55 50.21 92.95 93.12 708 50.35 48.42 49.84 92.90 92.98 706 50.00 48.24 49.73 92.65 92.71 704 49.72 47.74 49.42 92.60 93.09 702 49.48 47.64 49.25 92.74 92.97 700 49.27 47.38 49.03 92.54 92.84 698 48.98 46.99 48.78 92.57 92.84 696 48.73 46.84 48.40 92.29 92.72 694 48.53 46.54 48.02 92.50 92.78 692 48.30 46.17 47.98 92.32 92.78 690 47.97 45.92 47.78 92.26 92.49 688 47.76 45.74 47.50 92.16 92.53 686 47.62 45.47 47.15 92.06 92.29 684 47.25 45.24 46.84 92.12 92.59 682 47.21 45.08 46.73 91.89 92.40 680 46.76 44.81 46.51 92.01 92.44 678 46.71 44.64 46.28 91.93 92.46 676 46.30 44.40 45.87 91.72 92.15 674 46.01 44.00 45.88 91.82 92.07 672 45.81 43.67 45.29 91.97 92.08 670 45.39 43.44 45.35 91.61 91.99 668 45.43 43.39 45.04 91.63 91.85 666 45.16 43.12 44.75 91.75 91.71 664 44.91 42.77 44.42 91.62 91.60 662 44.54 42.67 44.25 91.42 91.66 660 44.48 42.37 44.04 91.33 91.62 658 44.17 42.03 43.81 91.14 91.39 656 43.77 41.88 43.44 91.03 91.28 654 43.45 41.57 43.24 90.87 91.15 652 43.15 41.10 42.77 90.63 90.97 650 42.87 40.61 42.31 90.49 90.96 648 42.46 40.23 41.99 90.32 90.45 646 42.23 40.04 41.77 90.27 90.54 644 42.05 39.74 41.57 90.31 90.57 642 41.93 39.65 41.42 90.04 90.61 640 41.71 39.60 41.25 90.13 90.32 638 41.55 39.28 41.09 89.97 90.42 636 41.27 39.11 40.95 89.86 90.13 634 40.97 38.92 40.65 89.92 90.12 632 40.79 38.65 40.32 89.80 90.07 630 40.57 38.46 40.26 89.52 90.14 628 40.51 38.19 40.02 89.48 89.91 626 40.31 38.07 39.83 89.57 89.91 624 40.12 37.84 39.66 89.27 89.80 622 39.92 37.67 39.40 89.55 89.53 620 39.74 37.58 39.36 89.42 89.60 618 39.54 37.32 39.24 89.21 89.55 616 39.27 36.98 38.93 89.01 89.46 614 39.25 36.84 38.66 89.03 89.19 612 39.10 36.64 38.61 88.82 89.24 610 38.82 36.63 38.38 88.75 88.89 608 38.55 36.34 38.08 88.61 88.93 606 38.46 36.06 38.00 88.64 88.87 604 38.25 35.95 37.85 88.39 88.84 602 38.05 35.65 37.52 88.32 88.58 600 37.84 35.56 37.37 88.25 88.78 598 37.72 35.40 37.14 88.12 88.55 596 37.52 35.26 36.94 88.26 88.45 594 37.38 34.98 36.78 88.00 88.35 592 37.12 34.71 36.56 87.70 88.23 590 36.93 34.48 36.38 87.55 87.97 588 36.76 34.41 36.26 87.72 87.82 586 36.51 34.12 36.05 87.18 87.79 584 36.31 33.81 35.74 87.41 87.22 582 36.08 33.70 35.51 86.95 87.40 580 35.77 33.48 35.34 86.76 87.34 578 35.61 33.24 35.16 86.87 86.97 576 35.48 33.01 34.96 86.62 86.94 574 35.21 32.77 34.69 86.42 86.80 572 34.96 32.51 34.39 86.35 86.54 570 34.81 32.39 34.13 86.03 86.57 568 34.55 32.08 33.98 85.92 86.15 566 34.47 31.91 33.72 85.48 85.96 564 34.28 31.67 33.57 85.48 85.80 562 33.90 31.46 33.33 85.37 85.64 560 33.71 31.28 33.23 84.83 85.44 558 33.50 31.01 32.85 84.84 85.35 556 33.42 30.88 32.76 84.53 85.08 554 33.16 30.65 32.50 84.48 84.88 552 32.88 30.34 32.25 84.20 84.57 550 32.65 30.06 32.01 84.09 84.36 548 32.44 29.92 31.87 83.76 84.23 546 32.23 29.59 31.62 83.58 83.83 544 32.04 29.36 31.35 83.32 83.56 542 31.81 29.22 30.94 83.27 83.43 540 31.57 29.15 30.82 82.79 83.05 538 31.34 28.78 30.68 82.41 82.70 536 31.08 28.46 30.45 82.14 82.48 534 30.80 28.36 30.20 81.89 82.52 532 30.60 28.11 29.95 81.70 82.08 530 30.36 27.63 29.70 81.51 81.84 528 30.15 27.51 29.51 81.21 81.61 526 30.09 27.24 29.23 80.63 81.34 524 29.65 27.08 29.10 80.41 80.89 522 29.51 26.74 28.68 80.36 80.68 520 29.31 26.47 28.37 80.01 80.51 518 28.93 26.28 28.23 79.84 80.16 516 28.61 26.03 27.92 79.38 79.67 514 28.40 25.82 27.66 79.09 79.40 512 28.19 25.54 27.55 78.72 79.07 510 28.01 25.29 27.22 78.43 78.60 508 27.68 25.06 27.09 78.18 78.51 506 27.35 24.83 26.83 77.72 78.34 504 27.25 24.58 26.43 77.49 77.92 502 27.06 24.28 26.31 77.11 77.44 500 26.75 24.07 25.86 76.77 77.16 498 26.50 23.94 25.95 76.44 76.99 496 26.27 23.62 25.47 76.24 76.68 494 25.86 23.37 25.33 75.66 76.38 492 25.70 23.05 24.83 75.34 75.92 490 25.22 22.75 24.73 74.97 75.69 488 25.04 22.54 24.51 74.56 75.10 486 24.86 22.25 24.27 74.40 74.89 484 24.55 22.12 24.01 73.74 74.52 482 24.50 21.69 23.73 73.53 74.00 480 23.84 21.54 23.32 73.29 73.61 478 23.86 21.20 23.27 72.72 73.57 476 23.46 21.07 22.76 72.46 73.00 474 23.27 20.82 22.44 71.98 72.65 472 22.98 20.40 22.18 71.59 72.43 470 22.59 20.24 22.08 71.02 72.06 468 22.38 19.96 21.59 70.75 71.42 466 22.12 19.52 21.56 70.29 71.00 464 21.89 19.37 21.19 69.49 70.53 462 21.58 19.07 20.90 68.96 70.13 460 21.04 18.72 20.39 68.45 69.65 458 21.10 18.50 20.30 68.13 69.24 456 20.55 18.18 20.17 67.58 68.85 454 20.25 18.09 19.74 66.76 68.26 452 19.70 17.56 19.43 66.36 67.39 450 19.59 17.32 19.08 65.98 67.23 448 19.28 17.31 18.86 65.59 66.82 446 18.92 16.86 18.51 64.99 66.06 444 18.66 16.69 18.30 64.36 65.57 442 18.45 16.37 18.02 63.70 64.76 440 18.32 16.03 17.72 62.52 64.38 438 17.70 15.69 17.45 62.30 63.63 436 17.41 15.55 17.19 61.40 63.27 434 17.02 15.30 16.97 60.91 62.64 432 16.90 14.84 16.51 59.85 62.18 430 16.35 14.68 16.14 59.24 61.13 428 16.36 14.40 15.81 58.43 60.72 426 16.01 14.26 15.67 58.32 60.42 424 15.81 13.65 15.42 57.28 59.56 422 15.71 13.65 15.06 56.40 58.82 420 15.16 13.52 14.66 56.08 58.25 418 14.75 13.11 14.60 55.27 57.51 416 14.38 12.70 14.50 53.73 56.84 414 14.66 12.66 13.88 53.39 56.34 412 14.17 12.44 14.30 53.29 55.46 410 13.79 12.53 13.58 52.42 55.26 408 13.71 12.28 13.28 52.06 54.61 406 13.54 12.54 13.73 50.84 54.09 404 13.23 12.37 13.14 50.89 53.35 402 13.61 12.69 13.55 49.33 52.72 400 12.69 11.77 13.00 48.90 52.51 398 13.59 11.98 13.19 48.81 52.19 396 12.77 12.72 12.79 48.62 51.59 394 13.55 11.70 12.67 47.28 51.07 392 12.93 11.81 13.11 47.72 51.09 390 13.11 11.88 13.10 46.01 50.17 388 13.61 12.41 13.17 46.09 50.45 386 13.88 12.19 13.79 45.98 50.13 384 13.46 12.27 13.70 45.82 50.62 382 13.28 12.75 13.50 44.87 49.51 380 14.08 13.46 13.83 42.89 49.26 1650 97.71 97.55 97.65 97.97 98.07 1640 97.73 97.57 97.66 97.98 98.05 1630 97.75 97.59 97.68 97.98 98.05 1620 97.74 97.57 97.68 97.97 98.04 1610 97.75 97.60 97.69 97.96 98.04 1600 97.75 97.57 97.66 97.95 98.02 1590 97.72 97.56 97.65 97.93 98.01 1580 97.69 97.53 97.62 97.92 98.00 1570 97.67 97.51 97.59 97.91 97.99 1560 97.64 97.48 97.57 97.89 97.98 1550 97.61 97.45 97.54 97.88 97.96 1540 97.58 97.41 97.51 97.87 97.95 1530 97.54 97.38 97.47 97.86 97.95 1520 97.50 97.33 97.44 97.85 97.93 1510 97.46 97.29 97.39 97.83 97.90 1500 97.40 97.24 97.35 97.81 97.91 1490 97.35 97.19 97.29 97.80 97.89 1480 97.30 97.12 97.22 97.76 97.87 1470 97.24 97.07 97.17 97.73 97.86 1460 97.17 97.00 97.10 97.74 97.84 1450 97.10 96.91 97.03 97.70 97.83 1440 97.03 96.84 96.96 97.67 97.81 1430 96.94 96.75 96.88 97.65 97.80 1420 96.87 96.68 96.80 97.61 97.78 1410 96.79 96.59 96.72 97.51 97.77 1400 96.70 96.51 96.63 97.43 97.75 1390 96.62 96.40 96.54 97.41 97.74 1380 96.50 96.28 96.42 97.35 97.72 1370 96.37 96.15 96.29 97.29 97.68 1360 96.25 96.02 96.17 97.25 97.67 1350 96.12 95.87 96.04 97.46 97.64 1340 95.99 95.73 95.90 97.52 97.61 1330 95.85 95.59 95.77 97.50 97.60 1320 95.71 95.42 95.61 97.48 97.56 1310 95.55 95.26 95.46 97.46 97.55 1300 95.41 95.10 95.30 97.44 97.54 1290 95.23 94.91 95.12 97.41 97.50 1280 95.07 94.72 94.95 97.39 97.49 1270 94.88 94.53 94.76 97.38 97.46 1260 94.68 94.32 94.56 97.35 97.44 1250 94.48 94.09 94.34 97.32 97.42 1240 94.26 93.85 94.12 97.30 97.40 1230 94.03 93.60 93.87 97.27 97.37 1220 93.78 93.33 93.63 97.25 97.34 1210 93.51 93.05 93.35 97.22 97.33 1200 93.23 92.76 93.06 97.18 97.28 1190 92.93 92.42 92.75 97.16 97.26 1180 92.62 92.08 92.42 97.12 97.23 1170 92.30 91.74 92.09 97.09 97.20 1160 91.97 91.38 91.75 97.07 97.18 1150 91.62 91.01 91.41 97.03 97.15 1140 91.26 90.61 91.02 96.99 97.12 1130 90.86 90.18 90.61 96.95 97.09 1120 90.44 89.73 90.18 96.93 97.07 1110 89.98 89.26 89.72 96.91 97.02 1100 89.51 88.76 89.23 96.87 96.99 1090 89.03 88.22 88.73 96.83 96.96 1080 88.49 87.66 88.18 96.79 96.93 1070 87.95 87.07 87.62 96.75 96.88 1060 87.37 86.48 87.05 96.71 96.85 1050 86.77 85.84 86.42 96.66 96.82 1040 86.14 85.16 85.78 96.62 96.78 1030 85.49 84.48 85.12 96.59 96.73 1020 84.79 83.75 84.41 96.52 96.68 1010 84.07 82.99 83.68 96.47 96.64 1000 83.33 82.21 82.92 96.43 96.59 990 82.54 81.38 82.13 96.38 96.54 980 81.72 80.54 81.30 96.31 96.49 970 80.88 79.65 80.46 96.26 96.43 960 80.00 78.75 79.58 96.19 96.39 950 79.11 77.80 78.67 96.13 96.29