# Subaru Telescope Infrared Secondary Mirror In-Situ Measured Reflectivity # Coated with Silver on 2019-11-07 # Opened the vacuum chamber on 2019-11-11 # Measured with Subaru Portable Spectrophotometer (SPS) on 2024-07-03 (1700 days after) # Measured three times # Data between 950 nm and 1650 nm are also available (SPS-XWW). # Contact: Hirofumi Okita (okita14@naoj.org) # # Wavelength (nm) #1 #2 #3 1000 97.59 98.39 99.43 998 98.81 98.83 99.54 996 99.56 99.13 98.65 994 99.02 98.21 99.11 992 98.99 99.36 98.98 990 99.46 98.89 98.42 988 99.16 99.41 99.11 986 98.49 98.76 99.21 984 99.79 98.85 98.85 982 98.49 98.89 98.46 980 98.90 98.73 98.89 978 98.96 98.90 99.20 976 99.37 99.21 98.43 974 98.75 98.83 99.19 972 97.94 99.26 99.10 970 98.61 98.69 99.59 968 98.40 98.73 99.17 966 99.02 98.52 99.09 964 99.03 99.34 99.36 962 98.81 99.29 99.05 960 99.00 98.81 99.37 958 98.75 98.57 99.20 956 98.89 98.98 98.40 954 98.47 98.88 98.43 952 97.82 98.42 98.74 950 98.58 98.70 98.20 948 98.59 99.14 99.49 946 98.92 98.89 98.73 944 98.71 98.87 98.36 942 98.94 98.54 98.58 940 98.63 98.44 98.75 938 99.00 99.14 98.60 936 98.81 98.12 98.62 934 98.82 99.09 98.44 932 98.84 98.81 98.91 930 99.07 98.56 99.10 928 98.89 98.08 98.61 926 98.32 98.96 98.77 924 98.84 98.99 98.97 922 98.73 98.94 99.10 920 98.73 99.22 98.70 918 99.22 98.97 98.37 916 99.38 98.83 98.78 914 99.35 99.25 99.30 912 98.86 99.02 98.47 910 99.16 98.98 98.84 908 98.67 99.12 98.58 906 99.00 99.44 98.78 904 99.21 98.91 98.69 902 98.59 98.51 98.69 900 98.73 99.13 98.91 898 98.42 98.46 98.98 896 98.91 99.19 99.21 894 99.01 99.07 98.70 892 99.21 98.78 98.85 890 98.80 99.06 98.51 888 99.06 98.49 98.90 886 98.85 98.74 98.75 884 99.13 98.73 98.80 882 98.34 98.67 98.77 880 99.06 99.08 98.54 878 98.67 98.88 98.50 876 98.29 99.02 99.00 874 98.63 98.93 99.07 872 99.02 98.69 99.01 870 99.05 98.72 98.86 868 99.02 98.63 98.71 866 98.93 98.09 98.82 864 98.72 98.67 98.47 862 98.21 98.68 98.76 860 98.87 99.05 98.79 858 99.30 98.81 98.71 856 98.57 98.39 99.11 854 98.80 98.83 99.29 852 98.84 98.59 98.48 850 98.56 98.71 98.52 848 98.50 98.93 99.49 846 98.68 98.72 98.73 844 98.49 98.43 98.50 842 98.72 98.47 98.95 840 98.54 98.40 99.20 838 98.29 98.61 98.35 836 98.56 99.03 98.64 834 98.57 99.00 98.64 832 98.61 99.32 98.59 830 98.73 98.97 98.81 828 98.40 98.84 98.26 826 98.42 98.81 99.24 824 98.57 98.27 98.62 822 98.98 98.51 98.66 820 98.39 98.81 98.67 818 98.26 98.66 98.79 816 98.33 98.49 98.58 814 98.40 98.44 98.27 812 98.05 98.82 98.33 810 98.64 98.73 98.87 808 98.48 98.66 98.68 806 98.55 98.94 98.78 804 98.65 97.90 98.91 802 98.66 97.96 98.65 800 98.53 98.61 98.72 798 98.95 98.55 98.51 796 98.65 98.56 98.57 794 98.35 98.49 98.58 792 98.62 98.44 98.70 790 98.28 99.00 98.62 788 98.75 98.76 98.61 786 98.69 98.67 98.31 784 98.15 98.51 98.48 782 98.20 98.48 98.43 780 98.47 98.68 98.52 778 98.59 98.77 98.41 776 98.39 98.47 98.62 774 98.24 98.59 98.70 772 98.55 98.36 98.79 770 98.27 98.33 98.70 768 98.43 98.78 98.32 766 98.70 98.27 98.42 764 98.61 98.70 98.36 762 98.48 98.55 98.57 760 98.58 98.09 98.58 758 98.64 98.33 98.39 756 98.43 98.82 98.63 754 98.39 98.45 98.85 752 98.45 98.43 98.53 750 98.23 98.52 98.42 748 98.36 98.34 98.60 746 98.07 98.32 98.59 744 98.43 98.29 98.61 742 98.30 98.28 98.76 740 98.19 98.07 98.34 738 98.48 98.44 98.24 736 98.43 98.01 98.52 734 98.58 98.32 98.54 732 98.31 98.44 98.46 730 98.32 98.41 98.21 728 98.36 97.90 98.46 726 98.26 98.10 98.27 724 98.24 98.36 98.11 722 98.05 98.41 98.31 720 98.11 98.09 98.07 718 98.23 98.32 97.96 716 98.23 98.58 98.30 714 98.54 98.24 98.60 712 98.21 98.06 98.37 710 98.09 98.06 98.18 708 98.06 98.24 98.00 706 98.09 98.47 97.98 704 98.32 97.90 98.23 702 98.14 98.24 98.17 700 98.33 98.02 98.17 698 97.89 97.98 98.17 696 97.96 98.17 98.21 694 98.14 98.05 97.99 692 97.93 97.98 98.04 690 98.11 98.20 98.08 688 98.00 97.84 98.08 686 98.11 97.98 97.94 684 98.24 98.24 97.91 682 98.08 98.16 97.84 680 98.09 97.76 97.85 678 97.83 97.90 97.79 676 97.97 98.02 97.79 674 97.91 98.06 97.87 672 97.91 97.99 97.70 670 97.96 97.70 97.71 668 97.85 97.51 98.07 666 97.89 97.70 97.81 664 97.94 97.67 97.76 662 97.65 97.56 97.83 660 97.80 97.89 97.69 658 97.88 97.91 97.69 656 97.62 97.70 97.78 654 97.59 97.66 97.67 652 97.83 97.82 97.57 650 97.61 97.55 97.72 648 97.53 97.52 97.47 646 97.48 97.56 97.48 644 97.34 97.44 97.54 642 97.54 97.59 97.48 640 97.44 97.46 97.49 638 97.37 97.63 97.68 636 97.45 97.41 97.48 634 97.46 97.56 97.58 632 97.36 97.25 97.49 630 97.38 97.16 97.33 628 97.35 97.32 97.34 626 97.34 97.24 97.25 624 97.28 97.25 97.42 622 97.29 97.27 97.43 620 97.34 97.32 97.39 618 97.26 97.25 97.33 616 97.20 97.14 97.19 614 97.20 97.17 97.17 612 97.23 97.34 97.06 610 97.17 97.16 97.31 608 97.32 97.14 97.20 606 97.22 97.14 97.05 604 97.68 96.93 97.11 602 97.16 97.07 97.07 600 96.98 96.99 97.01 598 97.03 97.00 96.99 596 96.99 96.94 96.94 594 96.94 96.97 96.82 592 96.64 96.84 97.09 590 96.81 96.88 96.70 588 96.85 96.85 96.62 586 96.88 96.80 96.67 584 96.70 96.53 96.87 582 96.75 96.55 96.55 580 96.54 96.65 96.62 578 96.41 96.69 96.37 576 96.58 96.61 96.50 574 96.37 96.36 96.45 572 96.55 96.57 96.57 570 96.40 96.35 96.49 568 96.27 96.29 96.57 566 96.40 96.31 96.38 564 96.19 96.26 96.28 562 96.49 96.15 96.40 560 96.24 96.26 96.26 558 96.38 96.32 96.10 556 95.97 96.02 96.16 554 95.82 96.01 95.97 552 96.12 96.08 96.00 550 96.08 96.04 95.76 548 95.90 95.95 95.85 546 95.76 95.86 95.88 544 95.62 95.76 95.76 542 95.65 95.64 95.40 540 95.67 95.67 95.41 538 95.50 95.45 95.43 536 95.68 95.48 95.30 534 95.16 95.46 95.37 532 95.20 95.23 95.23 530 95.38 95.02 95.25 528 95.27 95.26 95.27 526 95.08 95.19 95.02 524 94.90 94.85 94.69 522 94.84 94.77 94.83 520 94.83 94.78 94.83 518 94.68 94.61 94.75 516 94.57 94.59 94.51 514 94.51 94.58 94.67 512 94.54 94.56 94.51 510 94.57 94.34 94.34 508 94.21 94.12 94.27 506 94.07 93.96 94.07 504 93.70 94.03 94.06 502 93.44 93.82 93.58 500 93.72 93.85 93.59 498 93.57 93.68 93.19 496 93.32 93.51 93.41 494 92.84 93.29 93.22 492 93.17 93.36 93.13 490 93.12 92.91 92.66 488 92.69 92.81 92.62 486 92.80 92.51 92.34 484 92.46 92.55 91.99 482 92.35 92.40 92.05 480 91.85 92.28 91.63 478 91.52 92.03 91.80 476 91.57 91.61 91.67 474 91.65 91.20 91.40 472 91.11 91.38 90.99 470 90.89 91.22 90.65 468 90.38 91.07 90.29 466 90.45 90.89 90.29 464 90.35 90.68 90.15 462 89.94 90.39 89.58 460 89.54 89.96 89.46 458 89.38 89.86 89.11 456 88.99 89.49 89.15 454 88.76 89.45 88.18 452 88.77 88.99 88.32 450 88.37 88.13 88.05 448 88.03 87.85 87.95 446 87.17 87.79 87.33 444 87.59 87.83 87.17 442 86.99 87.15 86.93 440 86.60 86.87 86.28 438 86.39 86.44 86.29 436 85.91 86.34 85.69 434 85.73 85.91 84.95 432 85.09 85.48 85.06 430 85.13 85.14 84.68 428 84.59 84.79 84.37 426 84.18 84.80 84.22 424 84.29 83.56 83.82 422 83.45 83.81 83.18 420 83.22 83.03 82.92 418 82.65 83.28 83.13 416 82.06 82.83 81.82 414 81.80 82.15 81.39 412 81.05 81.59 80.76 410 80.76 80.95 80.40 408 79.90 80.50 80.64 406 79.87 79.92 79.94 404 78.79 79.58 79.38 402 78.28 78.71 78.93 400 78.40 78.66 77.57 398 76.56 77.90 77.07 396 76.22 77.11 76.83 394 75.73 75.71 76.15 392 75.20 75.93 74.81 390 75.30 75.24 74.97 388 74.07 75.27 75.24 386 74.02 74.19 75.00 384 73.66 73.54 74.41 382 72.28 74.25 72.15 380 71.63 73.75 72.78 1650 99.25 99.24 99.22 1640 99.24 99.23 99.21 1630 99.23 99.22 99.23 1620 99.25 99.22 99.22 1610 99.24 99.22 99.21 1600 99.23 99.23 99.23 1590 99.24 99.22 99.22 1580 99.23 99.22 99.22 1570 99.24 99.23 99.19 1560 99.23 99.22 99.22 1550 99.24 99.22 99.22 1540 99.23 99.21 99.21 1530 99.24 99.22 99.22 1520 99.23 99.21 99.21 1510 99.23 99.22 99.20 1500 99.23 99.22 99.20 1490 99.23 99.21 99.20 1480 99.23 99.22 99.20 1470 99.23 99.21 99.20 1460 99.23 99.21 99.20 1450 99.23 99.20 99.19 1440 99.22 99.20 99.20 1430 99.23 99.19 99.19 1420 99.23 99.20 99.18 1410 99.22 99.19 99.20 1400 99.22 99.19 99.19 1390 99.22 99.20 99.19 1380 99.22 99.20 99.18 1370 99.21 99.19 99.18 1360 99.21 99.18 99.18 1350 99.20 99.18 99.17 1340 99.20 99.17 99.17 1330 99.20 99.17 99.16 1320 99.19 99.17 99.16 1310 99.19 99.17 99.16 1300 99.19 99.17 99.15 1290 99.17 99.16 99.15 1280 99.18 99.15 99.15 1270 99.17 99.15 99.14 1260 99.17 99.15 99.12 1250 99.17 99.14 99.14 1240 99.16 99.14 99.14 1230 99.16 99.13 99.12 1220 99.14 99.13 99.12 1210 99.14 99.12 99.12 1200 99.14 99.11 99.10 1190 99.13 99.12 99.10 1180 99.12 99.09 99.10 1170 99.12 99.10 99.08 1160 99.12 99.09 99.08 1150 99.11 99.08 99.08 1140 99.09 99.08 99.06 1130 99.11 99.09 99.06 1120 99.10 99.07 99.05 1110 99.09 99.07 99.04 1100 99.08 99.06 99.04 1090 99.07 99.05 99.04 1080 99.08 99.06 99.03 1070 99.06 99.04 99.01 1060 99.07 99.02 99.02 1050 99.05 99.02 99.00 1040 99.03 99.02 99.00 1030 99.02 99.01 98.98 1020 99.02 99.01 98.98 1010 99.01 98.98 98.96 1000 99.00 98.98 98.95 990 99.00 98.97 98.95 980 98.98 98.96 98.95 970 98.97 98.96 98.92 960 98.95 98.94 98.93 950 98.94 98.92 98.89