# 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 2022-04-22 (897 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 97.63 99.17 99.60 998 98.36 99.83 99.27 996 99.02 99.25 99.59 994 98.93 101.21 98.78 992 99.85 99.12 99.95 990 98.28 99.43 99.37 988 98.34 98.86 99.46 986 98.42 99.37 98.85 984 99.91 99.01 98.70 982 98.20 100.10 98.39 980 99.02 99.86 98.55 978 99.48 99.74 99.94 976 98.32 99.52 100.75 974 99.35 98.99 100.01 972 99.15 99.75 100.21 970 98.49 99.70 99.50 968 98.46 99.39 99.64 966 100.04 98.60 99.26 964 98.84 99.26 99.20 962 99.17 99.10 98.89 960 99.87 99.15 99.07 958 99.39 99.57 99.11 956 99.21 99.61 98.76 954 98.86 99.24 98.96 952 99.26 99.93 98.74 950 98.73 99.78 99.02 948 99.25 99.56 99.67 946 99.31 98.67 99.49 944 98.67 99.32 99.25 942 98.60 98.91 99.36 940 99.61 99.60 99.34 938 98.91 98.96 99.27 936 99.14 98.97 99.46 934 98.98 99.08 98.96 932 98.97 98.97 99.57 930 98.72 99.18 99.43 928 99.41 99.22 99.75 926 98.96 98.88 98.67 924 98.82 99.04 99.32 922 99.05 98.99 99.32 920 98.95 99.11 98.95 918 99.08 99.41 99.09 916 99.31 99.36 98.95 914 99.15 98.85 99.67 912 99.30 99.17 99.05 910 99.00 99.42 99.22 908 98.69 99.22 99.27 906 99.00 99.15 99.31 904 99.09 98.91 98.82 902 98.58 99.05 99.11 900 99.70 99.09 98.94 898 98.93 98.78 98.98 896 98.48 99.05 98.98 894 98.87 98.91 99.06 892 99.26 99.45 99.03 890 99.15 99.03 98.94 888 98.62 99.03 99.13 886 99.03 99.24 99.16 884 98.94 98.81 99.03 882 98.88 99.32 98.78 880 99.20 98.65 99.19 878 98.96 99.18 98.66 876 98.49 99.09 99.07 874 99.03 99.41 99.53 872 98.93 99.27 99.07 870 99.04 99.02 99.21 868 99.14 99.29 99.03 866 99.24 98.92 98.91 864 99.37 99.07 98.61 862 98.85 99.21 98.92 860 98.80 99.17 98.95 858 98.52 99.50 98.86 856 99.02 99.10 98.71 854 98.92 99.54 99.43 852 99.19 98.87 98.90 850 99.18 99.87 99.16 848 99.16 98.92 98.94 846 98.77 99.06 98.93 844 98.90 99.26 98.96 842 98.63 99.20 98.92 840 98.87 99.15 98.63 838 98.97 99.57 99.32 836 99.16 98.60 99.02 834 98.86 98.73 98.83 832 99.14 98.45 98.90 830 99.01 98.66 98.91 828 98.96 98.76 98.49 826 99.02 98.95 98.71 824 98.62 99.53 98.82 822 98.66 99.14 98.54 820 99.01 98.81 98.67 818 99.07 98.83 98.88 816 98.77 99.20 98.71 814 98.96 98.88 98.58 812 98.84 99.20 99.01 810 98.78 98.56 99.24 808 98.54 98.39 98.87 806 99.29 98.66 98.87 804 98.51 98.70 98.73 802 98.90 99.10 98.52 800 98.68 98.90 98.78 798 98.95 99.10 98.52 796 98.57 98.70 98.74 794 98.39 98.86 98.67 792 98.93 98.92 98.96 790 99.01 98.87 99.08 788 98.68 98.69 98.90 786 98.80 98.92 98.64 784 98.87 98.89 99.11 782 98.96 99.02 98.92 780 98.63 98.45 98.78 778 98.71 98.83 98.76 776 99.08 98.75 98.75 774 98.73 98.97 98.89 772 98.71 98.75 98.52 770 98.71 98.96 98.26 768 98.73 98.89 98.90 766 98.63 98.76 98.84 764 98.61 98.85 98.84 762 98.54 98.88 98.58 760 98.62 98.69 98.69 758 98.71 98.58 98.49 756 98.68 98.76 98.80 754 98.68 98.62 98.47 752 98.91 98.84 98.44 750 98.80 98.81 98.44 748 98.60 99.12 98.45 746 98.52 99.01 98.74 744 98.55 99.02 98.48 742 98.48 98.83 98.44 740 98.64 99.01 98.65 738 98.55 98.74 98.64 736 98.59 98.56 98.42 734 98.76 98.65 98.42 732 98.27 98.53 98.55 730 98.52 98.91 98.49 728 98.40 98.87 98.54 726 98.41 98.52 98.62 724 98.33 98.44 98.84 722 98.51 98.46 98.47 720 98.49 98.81 98.63 718 98.76 98.57 98.41 716 98.61 98.69 98.56 714 98.65 98.56 98.43 712 98.28 98.53 98.38 710 98.70 98.50 98.37 708 98.46 98.45 98.24 706 98.44 98.56 98.38 704 98.52 98.52 98.24 702 98.22 98.39 98.65 700 98.45 98.46 98.36 698 98.38 98.78 98.23 696 98.40 98.47 98.46 694 98.57 98.46 98.30 692 98.30 98.21 98.29 690 98.28 98.31 98.29 688 98.21 98.15 98.54 686 98.26 98.51 98.39 684 98.43 98.42 98.34 682 98.40 98.21 98.10 680 98.17 98.49 98.31 678 98.36 98.34 98.42 676 98.08 98.29 98.30 674 98.26 98.37 98.33 672 98.29 98.26 98.30 670 98.31 98.37 98.34 668 98.56 98.28 98.12 666 98.15 98.14 97.97 664 98.11 98.07 98.12 662 98.08 98.20 98.16 660 98.41 98.12 98.13 658 98.08 98.15 98.25 656 98.05 98.24 98.12 654 98.00 98.04 98.09 652 98.15 98.08 98.05 650 98.00 98.04 98.11 648 97.96 97.91 97.92 646 97.84 98.04 98.03 644 98.00 97.98 98.10 642 97.90 98.07 98.00 640 98.15 98.05 98.03 638 97.82 98.02 97.74 636 97.99 98.02 97.92 634 97.80 98.00 98.03 632 97.63 97.82 97.95 630 97.77 97.88 97.98 628 97.97 97.72 97.68 626 97.78 97.81 97.78 624 97.69 97.81 98.01 622 97.68 97.85 98.14 620 97.70 97.89 97.86 618 97.84 97.67 97.71 616 97.67 97.69 97.83 614 97.96 97.82 97.66 612 97.76 97.87 97.75 610 97.55 97.78 97.73 608 97.79 97.75 97.68 606 97.69 97.78 97.62 604 97.46 97.56 97.56 602 97.60 97.60 97.78 600 97.63 97.75 97.50 598 97.76 97.66 97.60 596 97.57 97.70 97.54 594 97.56 97.54 97.68 592 97.63 97.41 97.59 590 97.44 97.60 97.64 588 97.52 97.57 97.56 586 97.34 97.53 97.40 584 97.34 97.30 97.31 582 97.42 97.33 97.40 580 97.45 97.38 97.36 578 97.25 97.40 97.40 576 97.36 97.28 97.35 574 97.48 97.19 97.06 572 97.28 97.31 97.25 570 97.29 97.18 97.31 568 97.03 97.24 97.29 566 97.19 96.95 96.97 564 97.16 97.05 97.08 562 97.12 97.02 97.05 560 96.92 96.93 96.90 558 96.97 97.10 97.03 556 97.07 96.95 97.01 554 97.20 97.02 97.02 552 96.95 96.92 97.08 550 96.99 96.80 97.00 548 97.04 96.87 96.83 546 96.82 97.06 97.00 544 96.59 96.75 96.63 542 96.50 96.56 96.72 540 96.65 96.69 96.68 538 96.74 96.64 96.82 536 96.61 96.54 96.51 534 96.72 96.50 96.15 532 96.15 96.55 96.43 530 96.29 96.52 96.48 528 96.30 96.29 96.41 526 96.49 96.37 96.44 524 96.10 96.40 96.34 522 96.23 96.23 96.01 520 96.18 96.26 96.41 518 96.14 96.44 95.89 516 96.25 96.12 96.13 514 95.94 95.98 95.76 512 95.99 95.86 95.74 510 95.84 96.01 95.96 508 95.81 95.60 95.73 506 95.71 95.61 95.56 504 95.50 95.76 95.74 502 95.56 95.71 95.58 500 95.52 95.58 95.49 498 95.56 95.50 95.59 496 95.40 95.11 95.30 494 95.35 95.16 95.40 492 95.05 95.39 95.17 490 94.71 94.93 95.01 488 94.88 94.73 94.92 486 94.82 94.62 94.49 484 94.67 94.68 94.63 482 94.31 94.87 94.70 480 94.27 94.69 94.54 478 94.19 94.29 94.37 476 94.34 94.09 94.16 474 93.96 94.10 94.13 472 93.78 93.73 93.82 470 93.79 93.45 93.90 468 93.26 93.47 93.40 466 93.17 93.60 93.00 464 93.13 93.19 92.95 462 93.09 92.70 92.83 460 92.64 92.79 92.84 458 92.61 92.42 92.31 456 92.66 92.26 92.41 454 92.09 92.46 92.11 452 91.66 92.16 91.55 450 91.67 92.04 91.27 448 91.39 91.71 91.54 446 91.21 91.48 91.16 444 90.86 90.94 90.82 442 90.76 90.77 90.75 440 90.52 90.85 90.69 438 90.25 90.08 89.99 436 90.03 90.41 89.90 434 89.60 89.94 89.69 432 89.46 89.83 89.38 430 88.99 89.02 89.73 428 89.18 88.75 89.39 426 88.71 89.04 88.66 424 88.44 88.72 88.53 422 88.21 88.55 88.42 420 87.68 87.90 88.24 418 88.09 88.07 87.92 416 87.69 87.35 87.18 414 87.07 87.53 86.81 412 86.73 87.22 87.09 410 86.47 86.80 86.47 408 86.34 86.64 86.14 406 86.34 86.11 85.38 404 85.78 86.46 85.61 402 85.20 85.33 85.53 400 85.20 84.20 85.65 398 83.45 83.92 84.89 396 83.61 83.64 84.55 394 83.01 83.81 84.06 392 83.03 83.41 82.80 390 82.39 82.83 82.52 388 81.32 82.23 82.91 386 81.88 82.46 81.36 384 80.26 80.93 81.33 382 79.87 80.79 80.84 380 80.41 80.67 79.71 1650 99.29 99.26 99.28 1640 99.28 99.27 99.27 1630 99.28 99.28 99.27 1620 99.27 99.27 99.27 1610 99.27 99.28 99.27 1600 99.27 99.26 99.26 1590 99.28 99.28 99.27 1580 99.27 99.26 99.26 1570 99.27 99.28 99.26 1560 99.28 99.28 99.27 1550 99.27 99.26 99.26 1540 99.26 99.26 99.26 1530 99.26 99.27 99.26 1520 99.27 99.27 99.27 1510 99.26 99.27 99.25 1500 99.26 99.26 99.25 1490 99.25 99.27 99.25 1480 99.25 99.26 99.25 1470 99.25 99.27 99.24 1460 99.24 99.27 99.26 1450 99.25 99.26 99.24 1440 99.24 99.25 99.25 1430 99.24 99.25 99.24 1420 99.25 99.25 99.25 1410 99.24 99.26 99.24 1400 99.24 99.26 99.24 1390 99.25 99.25 99.24 1380 99.25 99.26 99.24 1370 99.24 99.24 99.24 1360 99.24 99.25 99.23 1350 99.23 99.24 99.23 1340 99.22 99.23 99.23 1330 99.22 99.24 99.22 1320 99.22 99.24 99.22 1310 99.22 99.23 99.21 1300 99.21 99.23 99.22 1290 99.22 99.24 99.21 1280 99.22 99.23 99.21 1270 99.21 99.22 99.21 1260 99.21 99.22 99.21 1250 99.22 99.23 99.20 1240 99.22 99.22 99.21 1230 99.21 99.22 99.21 1220 99.21 99.21 99.20 1210 99.20 99.21 99.20 1200 99.20 99.21 99.20 1190 99.19 99.21 99.18 1180 99.19 99.20 99.18 1170 99.20 99.20 99.17 1160 99.19 99.20 99.17 1150 99.18 99.18 99.17 1140 99.18 99.19 99.17 1130 99.17 99.19 99.17 1120 99.17 99.18 99.14 1110 99.16 99.17 99.16 1100 99.16 99.17 99.15 1090 99.14 99.17 99.15 1080 99.15 99.15 99.12 1070 99.13 99.15 99.13 1060 99.14 99.14 99.12 1050 99.12 99.15 99.11 1040 99.11 99.14 99.11 1030 99.13 99.12 99.11 1020 99.11 99.13 99.09 1010 99.10 99.13 99.10 1000 99.08 99.13 99.08 990 99.09 99.10 99.07 980 99.08 99.10 99.07 970 99.06 99.10 99.06 960 99.06 99.12 99.05 950 99.04 99.08 99.04