# 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 2026-05-19 (2385 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 98.06 98.85 97.87 998 98.21 98.87 99.92 996 98.74 98.14 98.87 994 98.58 98.45 99.01 992 98.75 98.15 98.90 990 98.72 98.02 98.25 988 98.44 98.72 99.41 986 99.10 99.40 98.70 984 97.82 98.85 98.71 982 97.65 99.02 98.94 980 97.82 99.85 99.36 978 98.76 99.27 97.95 976 98.63 98.20 98.32 974 98.58 98.73 98.66 972 98.43 98.07 98.45 970 98.95 98.38 99.22 968 97.88 99.50 98.40 966 98.29 99.34 98.51 964 98.51 98.82 98.47 962 98.17 99.73 98.46 960 99.20 99.34 99.23 958 98.60 98.99 98.49 956 99.72 99.59 98.42 954 98.41 98.86 98.93 952 98.71 98.39 99.00 950 98.83 98.79 99.03 948 98.43 98.67 98.68 946 98.30 98.97 99.05 944 99.00 98.89 99.17 942 98.24 98.72 98.81 940 98.79 99.19 98.59 938 98.09 99.15 99.01 936 98.28 99.46 97.87 934 98.66 99.18 98.94 932 99.01 98.82 99.23 930 98.70 99.20 98.66 928 98.60 98.85 99.16 926 98.34 99.27 98.65 924 98.69 99.02 98.63 922 98.52 99.08 98.72 920 98.55 98.93 98.45 918 98.48 98.81 98.50 916 98.31 99.25 98.96 914 98.26 99.21 99.29 912 98.65 98.72 98.57 910 98.30 99.21 98.86 908 98.97 98.79 98.90 906 98.69 98.45 98.90 904 98.95 98.39 98.57 902 98.61 99.03 98.81 900 98.56 98.36 98.97 898 98.52 99.06 98.75 896 98.54 99.02 98.55 894 98.20 98.89 98.50 892 98.61 98.32 98.86 890 98.10 98.95 98.75 888 98.52 99.38 98.23 886 98.82 98.57 98.81 884 98.85 98.85 98.55 882 99.02 98.81 98.65 880 98.65 99.25 98.41 878 98.80 98.74 98.90 876 98.36 98.85 98.50 874 98.47 98.57 98.47 872 98.62 98.80 98.77 870 98.70 99.45 98.76 868 98.53 98.71 98.73 866 98.42 98.57 98.57 864 98.33 98.73 98.39 862 98.59 98.48 98.73 860 98.67 98.60 98.78 858 98.81 98.48 98.89 856 98.54 98.95 98.89 854 98.51 98.81 98.80 852 98.89 98.95 98.82 850 98.63 98.87 98.39 848 98.39 98.68 98.80 846 98.54 98.99 98.55 844 98.14 98.66 98.54 842 98.35 98.86 98.13 840 98.51 98.50 98.43 838 98.45 99.10 99.29 836 98.86 98.74 98.57 834 98.71 98.53 98.38 832 98.29 98.85 98.48 830 98.85 98.80 98.68 828 98.33 98.30 98.64 826 98.69 98.47 98.51 824 98.62 98.74 98.25 822 98.97 98.38 98.50 820 98.33 98.54 98.31 818 98.75 98.61 98.81 816 98.27 98.75 98.76 814 98.41 98.63 98.27 812 98.67 98.85 98.32 810 98.46 98.95 98.61 808 97.89 99.01 98.12 806 98.31 98.02 98.48 804 98.91 98.75 98.47 802 98.58 98.25 98.88 800 98.43 98.82 98.19 798 98.09 98.60 97.86 796 98.42 98.80 97.92 794 98.52 98.80 98.42 792 98.23 98.33 98.49 790 98.34 98.16 97.96 788 98.04 98.37 98.03 786 98.46 98.46 98.34 784 98.39 98.82 98.33 782 98.20 98.50 98.23 780 98.36 98.70 98.37 778 98.05 98.17 98.23 776 98.37 98.45 98.36 774 98.45 98.58 98.06 772 98.59 98.63 98.37 770 98.17 98.37 98.17 768 98.66 98.69 98.33 766 98.25 98.18 98.10 764 98.31 98.25 98.13 762 98.19 98.64 98.43 760 98.38 98.55 98.03 758 98.26 98.62 98.19 756 98.06 98.47 98.39 754 98.40 98.47 98.12 752 98.42 98.29 98.42 750 98.24 98.43 98.62 748 98.05 98.57 97.83 746 97.97 98.14 98.15 744 97.98 98.12 98.17 742 97.98 98.43 97.93 740 98.15 98.21 98.35 738 98.09 98.15 98.19 736 97.97 98.27 97.93 734 98.12 98.15 98.13 732 98.09 98.32 97.68 730 98.20 98.25 97.87 728 97.98 98.31 98.26 726 98.08 98.06 97.91 724 97.83 98.10 97.85 722 97.86 98.10 98.04 720 97.84 97.89 97.87 718 97.86 97.90 97.97 716 97.81 98.22 97.95 714 97.86 98.00 97.77 712 98.15 98.00 97.60 710 98.03 98.13 97.87 708 97.67 97.85 97.12 706 97.84 98.09 97.60 704 97.82 97.98 97.72 702 97.66 98.13 97.87 700 97.76 98.06 98.18 698 97.85 97.90 97.67 696 97.87 97.51 97.94 694 97.70 97.91 97.60 692 97.61 97.78 97.75 690 97.71 97.79 97.66 688 97.50 97.74 97.63 686 97.46 97.71 97.44 684 97.44 97.32 97.67 682 97.44 97.72 97.27 680 97.55 97.85 97.36 678 97.71 97.58 97.62 676 97.42 97.69 97.34 674 97.19 97.62 97.15 672 97.57 97.53 97.25 670 97.32 97.28 97.28 668 97.23 97.47 97.28 666 97.25 97.33 96.84 664 97.30 97.50 97.13 662 97.39 97.31 97.17 660 97.41 97.36 97.07 658 97.34 97.15 97.20 656 96.84 97.07 96.99 654 96.82 97.12 97.03 652 96.85 97.25 96.60 650 96.61 97.11 96.96 648 96.64 96.74 96.60 646 96.58 96.61 96.60 644 96.56 96.94 96.51 642 96.53 96.90 96.69 640 96.63 96.92 96.66 638 96.46 96.62 96.56 636 96.37 96.85 96.65 634 96.42 96.59 96.49 632 96.44 96.84 96.40 630 96.30 96.66 96.23 628 96.44 96.57 96.23 626 96.53 96.47 96.28 624 96.45 96.65 96.31 622 96.18 96.38 96.13 620 96.31 96.52 96.34 618 96.24 96.52 96.10 616 96.18 96.42 96.28 614 96.14 96.31 95.99 612 95.94 96.11 96.22 610 96.10 96.36 96.05 608 96.02 96.25 95.93 606 96.09 96.10 95.88 604 95.79 96.30 95.80 602 95.78 96.34 95.89 600 95.98 95.86 95.70 598 95.60 95.83 95.74 596 95.60 95.89 95.46 594 95.57 95.80 95.65 592 95.53 95.65 95.42 590 95.48 95.74 95.51 588 95.41 95.69 95.47 586 95.47 95.69 95.40 584 95.20 95.29 95.34 582 95.15 95.44 95.27 580 95.06 95.24 95.19 578 95.01 95.23 95.11 576 94.92 95.18 94.84 574 94.83 95.26 95.00 572 94.93 95.14 94.71 570 94.67 94.88 94.83 568 94.56 95.05 94.59 566 94.59 94.71 94.61 564 94.45 94.65 94.21 562 94.20 94.71 94.09 560 94.15 94.56 94.11 558 94.07 94.45 94.42 556 94.14 94.42 94.33 554 94.01 94.04 94.04 552 93.54 94.16 93.76 550 93.56 94.11 93.82 548 93.39 93.70 93.27 546 93.32 93.80 93.60 544 93.30 93.64 93.56 542 93.35 93.59 93.20 540 92.87 93.35 93.14 538 92.77 93.22 93.03 536 92.93 92.89 92.68 534 92.57 92.80 92.54 532 92.65 92.61 92.62 530 92.40 92.85 92.49 528 92.15 92.59 92.24 526 91.88 92.27 92.04 524 91.76 92.13 91.96 522 91.37 91.94 91.66 520 91.26 91.79 91.50 518 91.04 91.58 91.23 516 90.69 91.47 91.20 514 90.73 91.13 90.72 512 90.64 90.83 90.67 510 90.19 90.87 90.70 508 90.19 90.59 90.18 506 89.82 90.35 89.90 504 89.49 89.58 89.89 502 89.16 89.66 89.84 500 88.97 89.47 89.61 498 88.95 89.28 89.25 496 88.44 89.11 88.92 494 88.32 88.66 88.59 492 87.98 88.55 88.60 490 87.57 88.48 88.24 488 87.50 87.98 88.06 486 87.08 87.50 87.47 484 86.72 87.37 87.07 482 86.44 87.23 86.94 480 86.20 86.83 86.85 478 85.98 86.72 86.56 476 85.80 86.14 86.16 474 85.41 85.89 85.76 472 85.27 85.61 85.79 470 84.55 85.70 85.12 468 84.45 84.86 84.58 466 84.08 84.70 84.91 464 83.63 84.64 84.33 462 83.43 83.99 83.93 460 82.97 83.80 83.53 458 82.94 83.59 83.75 456 82.55 82.89 82.98 454 82.38 83.03 82.59 452 81.43 82.31 82.21 450 81.65 81.93 82.25 448 81.48 81.75 82.01 446 80.85 81.42 81.93 444 80.51 81.04 80.60 442 80.16 80.58 80.70 440 79.92 80.35 80.23 438 79.35 79.77 79.66 436 78.54 79.48 79.22 434 78.86 79.14 79.31 432 78.34 78.31 78.77 430 77.57 78.22 78.21 428 76.81 77.58 77.44 426 76.55 77.13 77.47 424 76.09 76.81 76.33 422 75.74 76.00 76.16 420 74.66 75.96 75.53 418 74.61 74.78 75.66 416 73.61 73.85 74.60 414 73.04 73.19 73.95 412 72.46 72.97 73.31 410 70.94 72.43 72.35 408 71.03 71.45 71.82 406 69.67 70.22 70.33 404 69.47 70.13 70.32 402 69.06 69.80 69.28 400 68.16 68.51 68.68 398 67.58 67.90 68.13 396 67.21 65.86 67.48 394 66.86 66.51 66.78 392 65.24 65.86 66.31 390 65.18 66.16 65.76 388 64.68 64.42 65.50 386 63.39 64.57 64.65 384 64.52 64.81 63.58 382 64.20 64.39 63.41 380 63.35 64.88 63.24 1650 99.22 99.31 99.25 1640 99.24 99.32 99.25 1630 99.22 99.31 99.24 1620 99.22 99.30 99.24 1610 99.23 99.31 99.24 1600 99.23 99.30 99.25 1590 99.22 99.30 99.23 1580 99.22 99.31 99.23 1570 99.23 99.30 99.22 1560 99.22 99.29 99.24 1550 99.23 99.28 99.23 1540 99.22 99.29 99.24 1530 99.22 99.28 99.22 1520 99.21 99.28 99.23 1510 99.22 99.28 99.22 1500 99.20 99.28 99.23 1490 99.21 99.27 99.22 1480 99.20 99.27 99.22 1470 99.21 99.25 99.22 1460 99.19 99.26 99.22 1450 99.20 99.25 99.21 1440 99.19 99.25 99.21 1430 99.20 99.25 99.21 1420 99.19 99.24 99.19 1410 99.18 99.25 99.20 1400 99.19 99.24 99.18 1390 99.19 99.23 99.18 1380 99.19 99.23 99.18 1370 99.17 99.22 99.16 1360 99.17 99.23 99.17 1350 99.17 99.22 99.17 1340 99.17 99.23 99.18 1330 99.17 99.23 99.18 1320 99.16 99.23 99.16 1310 99.15 99.21 99.16 1300 99.15 99.21 99.16 1290 99.16 99.22 99.15 1280 99.13 99.22 99.15 1270 99.14 99.22 99.14 1260 99.14 99.20 99.13 1250 99.13 99.20 99.12 1240 99.13 99.21 99.12 1230 99.13 99.20 99.11 1220 99.12 99.20 99.11 1210 99.11 99.19 99.10 1200 99.11 99.18 99.09 1190 99.10 99.17 99.08 1180 99.08 99.17 99.08 1170 99.08 99.16 99.06 1160 99.08 99.16 99.05 1150 99.06 99.14 99.05 1140 99.06 99.14 99.04 1130 99.05 99.13 99.03 1120 99.05 99.12 99.01 1110 99.03 99.11 99.02 1100 99.03 99.13 99.01 1090 99.03 99.11 98.99 1080 99.02 99.09 98.98 1070 98.99 99.08 98.96 1060 98.99 99.08 98.97 1050 98.98 99.06 98.95 1040 98.97 99.05 98.92 1030 98.95 99.04 98.92 1020 98.94 99.03 98.91 1010 98.95 99.02 98.90 1000 98.93 99.00 98.88 990 98.90 98.98 98.87 980 98.87 98.96 98.85 970 98.85 98.95 98.85 960 98.84 98.96 98.81 950 98.84 98.93 98.78