# 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 2024-10-24 (1813 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 98.80 99.59 99.19 998 99.01 98.78 98.91 996 99.21 99.68 98.84 994 99.79 99.67 98.00 992 99.89 98.68 99.09 990 98.32 99.42 98.05 988 98.30 98.27 98.49 986 99.32 99.78 98.78 984 99.78 99.05 99.07 982 99.14 98.47 99.07 980 99.09 98.52 99.62 978 98.96 99.72 98.49 976 99.19 98.54 98.70 974 99.07 97.80 99.42 972 100.23 98.65 99.88 970 99.09 99.13 98.79 968 98.64 97.87 99.57 966 99.76 99.40 99.00 964 99.31 99.20 99.33 962 99.87 99.66 98.85 960 99.10 98.54 98.79 958 99.17 99.29 99.50 956 99.18 98.89 99.19 954 98.99 98.41 98.28 952 98.94 99.19 99.34 950 98.18 99.19 98.65 948 98.82 98.66 100.27 946 99.15 99.06 98.90 944 99.06 98.70 98.56 942 99.28 98.82 99.17 940 98.56 99.27 99.08 938 98.57 99.75 99.05 936 98.75 99.01 99.42 934 99.20 98.52 98.99 932 99.33 99.17 98.54 930 98.85 98.70 99.29 928 99.13 98.69 99.00 926 98.62 99.05 98.69 924 98.78 98.86 98.78 922 99.15 98.67 98.81 920 98.87 98.83 99.18 918 98.90 98.96 98.83 916 98.96 99.22 98.75 914 99.20 99.14 98.84 912 98.84 99.02 98.74 910 99.15 98.59 98.86 908 98.68 98.73 99.02 906 98.61 98.67 99.25 904 99.18 98.28 99.20 902 98.87 99.06 98.79 900 99.06 99.14 98.73 898 98.89 99.05 98.83 896 98.69 98.86 98.76 894 99.25 98.95 98.93 892 99.08 98.69 99.43 890 98.89 98.70 98.59 888 98.98 98.59 98.97 886 98.98 98.74 99.34 884 99.12 99.10 99.01 882 98.99 98.69 99.28 880 98.84 99.10 99.20 878 98.48 98.79 98.69 876 98.85 98.86 98.36 874 98.99 99.02 98.36 872 99.02 98.58 99.16 870 98.77 98.89 99.26 868 98.92 99.32 99.03 866 98.17 98.84 98.61 864 98.82 98.97 99.26 862 98.68 98.95 99.04 860 98.51 98.60 99.03 858 98.71 98.80 98.36 856 99.08 98.62 98.98 854 98.75 99.23 98.63 852 98.68 98.51 98.45 850 98.69 98.68 99.30 848 98.67 98.62 99.17 846 98.18 98.67 98.88 844 98.65 98.45 98.90 842 98.93 98.09 98.55 840 98.86 98.80 98.95 838 98.93 98.73 99.13 836 99.04 98.80 98.76 834 98.26 98.68 98.37 832 99.07 98.83 99.12 830 98.73 98.62 98.07 828 98.44 98.68 98.61 826 98.68 98.51 98.98 824 98.77 98.95 98.54 822 98.64 98.96 98.93 820 98.93 98.56 99.18 818 98.98 98.58 98.93 816 98.81 98.64 98.46 814 98.50 98.69 98.80 812 98.69 98.87 99.02 810 98.72 98.71 98.54 808 99.03 98.22 98.85 806 98.50 98.52 98.70 804 98.53 98.61 98.76 802 98.16 98.42 98.59 800 98.63 98.48 98.77 798 98.79 98.47 98.54 796 98.84 98.84 98.19 794 99.18 98.47 98.44 792 98.69 98.52 98.61 790 98.71 98.67 98.87 788 98.68 98.73 98.69 786 98.48 98.40 98.94 784 98.66 98.62 98.68 782 98.48 98.74 98.73 780 98.74 98.24 98.70 778 98.50 98.37 98.54 776 98.76 98.82 98.54 774 98.58 98.41 98.82 772 98.67 98.93 98.59 770 98.33 98.57 98.59 768 98.77 98.89 98.82 766 98.87 98.60 98.90 764 98.67 98.92 98.54 762 98.24 98.62 98.24 760 98.56 98.54 98.59 758 98.58 98.54 98.54 756 98.63 98.51 98.78 754 98.62 98.39 98.58 752 98.28 98.39 98.49 750 98.90 98.22 98.62 748 98.46 98.46 98.30 746 98.69 98.74 98.37 744 98.52 98.86 98.52 742 98.41 98.58 98.61 740 98.80 98.19 98.82 738 98.67 98.73 98.34 736 98.27 98.73 98.34 734 98.04 98.34 98.44 732 98.28 98.38 98.65 730 98.55 98.34 98.36 728 98.40 98.52 98.48 726 98.53 98.32 98.35 724 98.74 98.36 98.21 722 98.56 98.48 98.35 720 98.47 98.44 98.42 718 98.49 98.53 98.41 716 98.55 98.69 98.26 714 98.44 98.30 98.31 712 98.43 98.41 98.26 710 98.35 98.37 98.18 708 98.22 98.16 98.49 706 98.33 98.36 98.68 704 98.55 98.30 98.23 702 98.16 98.33 98.17 700 98.05 98.10 98.51 698 98.29 98.02 98.28 696 98.22 98.09 98.53 694 98.10 98.42 98.14 692 98.25 98.23 98.44 690 98.25 97.97 98.43 688 98.06 98.07 98.14 686 98.25 98.16 98.30 684 98.18 98.05 98.19 682 98.16 98.21 98.06 680 97.95 98.28 98.35 678 98.19 98.14 97.90 676 98.22 98.08 97.97 674 98.02 98.05 97.94 672 97.94 97.81 98.08 670 98.05 98.01 98.01 668 97.91 98.30 97.85 666 97.90 98.04 97.80 664 98.04 97.97 98.09 662 97.95 97.90 97.91 660 97.93 97.82 97.94 658 97.87 97.62 97.79 656 97.93 97.77 97.72 654 97.81 97.83 97.68 652 97.80 97.65 97.77 650 97.51 97.58 97.54 648 97.54 97.74 97.61 646 97.68 97.60 97.75 644 97.57 97.62 97.42 642 97.41 97.50 97.49 640 97.69 97.68 97.54 638 97.42 97.49 97.41 636 97.50 97.43 97.59 634 97.47 97.66 97.41 632 97.41 97.42 97.47 630 97.73 97.45 97.54 628 97.37 97.19 97.57 626 97.35 97.31 97.44 624 97.59 97.07 97.45 622 97.36 97.16 97.36 620 97.40 97.25 97.53 618 97.42 97.07 97.50 616 97.32 97.28 97.48 614 97.40 97.17 97.35 612 97.04 97.20 97.30 610 97.02 97.14 97.07 608 96.96 97.02 97.03 606 97.28 97.11 97.30 604 97.71 97.17 96.40 602 97.49 97.11 96.68 600 96.83 97.11 96.99 598 96.91 97.11 96.90 596 96.92 96.92 96.82 594 96.95 96.87 96.99 592 96.81 96.90 96.89 590 96.88 96.73 96.84 588 96.76 96.82 96.87 586 96.53 96.86 96.73 584 97.02 96.31 96.86 582 96.52 96.63 96.63 580 96.53 96.61 96.42 578 96.64 96.38 96.62 576 96.47 96.56 96.55 574 96.40 96.43 96.61 572 96.46 96.42 96.43 570 96.37 96.34 96.48 568 96.52 96.29 96.20 566 96.26 96.34 96.27 564 95.91 96.21 96.29 562 96.15 96.09 96.14 560 96.19 95.86 96.03 558 96.09 96.07 96.18 556 95.83 96.01 96.21 554 96.10 95.96 95.81 552 95.82 95.99 95.80 550 95.84 95.78 95.71 548 95.75 95.78 95.92 546 95.52 95.72 95.82 544 95.72 95.58 95.47 542 95.30 95.69 95.42 540 95.31 95.20 95.56 538 95.42 95.41 95.44 536 95.21 95.49 95.55 534 95.12 95.28 95.38 532 95.08 95.12 95.07 530 95.44 95.01 95.20 528 94.98 95.04 95.23 526 94.96 94.69 95.05 524 94.97 94.88 94.78 522 94.79 94.77 94.89 520 94.70 94.67 94.70 518 94.62 94.50 94.47 516 94.34 94.71 94.48 514 94.20 94.05 94.22 512 94.18 94.27 94.21 510 93.97 94.00 94.08 508 94.01 93.66 93.82 506 93.86 93.83 93.94 504 93.55 93.62 93.65 502 93.66 93.57 93.52 500 93.11 93.33 93.48 498 93.29 93.41 93.23 496 93.15 93.27 93.38 494 92.82 93.06 93.02 492 92.66 92.86 92.57 490 92.87 92.64 92.70 488 91.89 92.52 92.63 486 92.41 92.31 92.26 484 92.12 92.09 92.19 482 91.80 91.85 91.72 480 91.78 91.63 91.70 478 91.37 91.30 91.42 476 91.41 91.44 91.40 474 91.00 91.22 91.08 472 90.51 90.85 90.94 470 90.52 90.65 90.71 468 90.32 90.19 90.58 466 89.91 90.12 89.84 464 90.08 89.87 89.82 462 89.76 89.36 89.22 460 89.00 89.15 89.18 458 88.66 88.98 89.05 456 88.81 88.86 89.45 454 88.27 88.72 88.27 452 88.09 88.07 88.05 450 87.98 87.91 88.15 448 87.63 87.59 87.82 446 87.12 87.36 87.37 444 86.83 86.91 87.20 442 86.87 86.80 86.90 440 86.29 86.56 86.53 438 85.62 85.94 86.35 436 85.29 85.38 85.73 434 84.80 85.23 84.99 432 84.93 84.64 84.81 430 84.96 84.31 85.14 428 83.70 84.21 84.23 426 83.27 83.83 83.71 424 82.66 82.90 83.49 422 82.75 82.57 83.06 420 81.82 82.45 82.19 418 82.37 81.55 82.24 416 81.35 81.06 81.15 414 80.31 80.94 80.45 412 79.79 79.93 80.41 410 79.35 79.80 79.73 408 78.74 79.39 78.93 406 78.37 78.49 78.60 404 77.61 77.93 78.77 402 76.83 76.91 76.94 400 76.34 76.41 76.75 398 75.94 76.04 76.30 396 77.57 75.31 79.14 394 74.02 74.26 75.01 392 74.48 74.09 73.43 390 73.38 73.33 73.49 388 72.83 72.66 72.15 386 71.62 71.91 73.67 384 71.44 71.34 71.65 382 71.50 70.87 71.09 380 70.66 70.57 71.07 1650 99.22 99.21 99.20 1640 99.23 99.20 99.19 1630 99.24 99.20 99.20 1620 99.20 99.21 99.21 1610 99.23 99.20 99.20 1600 99.22 99.21 99.20 1590 99.24 99.21 99.21 1580 99.22 99.20 99.20 1570 99.21 99.20 99.20 1560 99.22 99.20 99.19 1550 99.22 99.19 99.20 1540 99.20 99.19 99.19 1530 99.22 99.19 99.20 1520 99.21 99.19 99.18 1510 99.23 99.19 99.20 1500 99.20 99.20 99.18 1490 99.21 99.19 99.20 1480 99.21 99.18 99.20 1470 99.20 99.17 99.18 1460 99.21 99.18 99.19 1450 99.21 99.18 99.19 1440 99.20 99.19 99.18 1430 99.19 99.18 99.18 1420 99.21 99.17 99.19 1410 99.20 99.18 99.19 1400 99.19 99.17 99.19 1390 99.21 99.18 99.19 1380 99.18 99.17 99.18 1370 99.20 99.15 99.18 1360 99.19 99.15 99.17 1350 99.18 99.17 99.18 1340 99.18 99.16 99.16 1330 99.18 99.17 99.17 1320 99.18 99.15 99.17 1310 99.18 99.15 99.18 1300 99.18 99.16 99.16 1290 99.17 99.13 99.15 1280 99.18 99.13 99.15 1270 99.16 99.15 99.15 1260 99.17 99.12 99.15 1250 99.17 99.14 99.14 1240 99.16 99.13 99.14 1230 99.16 99.12 99.14 1220 99.16 99.11 99.13 1210 99.15 99.12 99.11 1200 99.14 99.12 99.12 1190 99.15 99.11 99.11 1180 99.14 99.11 99.12 1170 99.13 99.10 99.11 1160 99.12 99.10 99.11 1150 99.13 99.09 99.10 1140 99.13 99.09 99.09 1130 99.12 99.10 99.09 1120 99.12 99.09 99.09 1110 99.11 99.08 99.07 1100 99.12 99.07 99.07 1090 99.10 99.08 99.09 1080 99.10 99.05 99.08 1070 99.10 99.05 99.05 1060 99.09 99.04 99.06 1050 99.08 99.05 99.04 1040 99.08 99.03 99.05 1030 99.08 99.02 99.02 1020 99.08 99.02 99.03 1010 99.06 98.99 99.02 1000 99.03 99.01 99.03 990 99.03 98.99 99.00 980 99.03 98.98 98.99 970 99.01 98.96 98.97 960 99.01 98.96 98.97 950 98.97 98.96 98.95