# 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 2024-03-15 (1590 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 99.67 100.19 100.13 998 98.72 99.34 100.12 996 99.94 98.66 98.95 994 99.19 98.83 98.49 992 98.69 99.68 99.43 990 99.66 99.38 99.78 988 99.05 98.82 98.87 986 99.81 98.19 99.09 984 99.41 98.73 98.83 982 99.79 98.67 99.68 980 99.53 99.65 98.84 978 99.63 99.22 99.17 976 99.92 99.47 98.48 974 99.54 99.69 99.02 972 98.46 99.09 98.49 970 99.44 98.97 99.27 968 98.24 99.04 99.82 966 99.37 98.40 99.14 964 98.81 98.89 98.53 962 99.22 98.62 98.65 960 98.92 99.08 99.09 958 98.83 98.45 98.53 956 98.86 99.13 98.97 954 99.02 99.64 98.62 952 99.38 98.99 98.35 950 98.84 99.02 98.91 948 99.04 98.88 98.97 946 99.15 99.01 99.18 944 99.05 99.19 99.27 942 98.49 98.74 99.21 940 99.21 98.37 98.51 938 98.80 98.57 98.83 936 98.98 99.20 99.23 934 98.58 99.09 99.05 932 98.86 98.74 99.30 930 98.98 98.55 99.07 928 98.44 99.03 98.53 926 98.67 98.60 99.19 924 98.65 98.71 99.11 922 99.02 98.86 99.27 920 98.86 99.16 98.87 918 98.87 98.65 99.13 916 98.88 98.09 98.75 914 98.56 98.98 98.62 912 98.86 98.35 99.16 910 98.98 98.44 98.88 908 98.74 98.64 99.04 906 99.02 98.67 98.64 904 99.23 99.08 99.17 902 98.58 98.36 98.53 900 98.89 98.66 99.07 898 99.19 99.29 99.06 896 98.41 98.57 98.86 894 98.94 99.13 98.69 892 98.78 98.22 98.91 890 99.09 98.63 99.14 888 98.51 99.10 98.86 886 98.87 99.53 98.85 884 99.06 98.67 99.03 882 99.21 98.43 99.12 880 98.90 98.57 98.85 878 98.57 99.01 98.58 876 98.90 98.68 98.74 874 98.93 98.73 98.81 872 98.84 98.68 98.91 870 98.76 98.83 99.13 868 98.38 98.63 98.65 866 98.96 98.87 98.44 864 98.82 98.69 98.52 862 98.66 98.42 98.68 860 98.50 98.84 98.45 858 98.84 98.53 98.64 856 98.67 98.73 99.05 854 99.08 98.38 98.83 852 99.03 98.54 98.67 850 98.57 98.86 98.85 848 98.98 99.21 99.07 846 98.91 98.74 99.01 844 98.81 98.81 98.93 842 99.10 98.74 98.91 840 98.73 98.35 98.74 838 98.51 98.88 98.74 836 98.76 98.64 98.56 834 98.70 98.38 98.86 832 98.26 98.61 98.97 830 99.05 98.67 98.77 828 98.85 98.61 99.07 826 98.59 98.54 98.37 824 98.65 98.53 99.15 822 98.98 98.36 99.21 820 98.88 99.31 98.12 818 98.86 98.52 98.74 816 98.95 98.97 98.65 814 98.63 98.39 98.28 812 98.99 98.32 98.81 810 98.86 98.86 98.86 808 98.89 98.72 98.76 806 98.72 98.48 98.63 804 98.82 99.00 98.83 802 98.53 98.52 99.02 800 98.32 98.58 98.67 798 98.73 98.69 98.88 796 99.03 98.63 98.35 794 98.60 98.30 98.77 792 98.84 98.41 98.93 790 98.90 98.58 98.81 788 98.52 98.45 98.24 786 98.75 98.35 98.48 784 98.96 98.41 98.55 782 98.55 98.55 98.65 780 98.94 98.58 98.78 778 98.83 98.89 98.79 776 98.73 98.61 98.81 774 98.90 98.55 98.63 772 98.59 98.42 98.76 770 98.71 98.83 98.80 768 99.11 98.66 98.72 766 98.83 98.70 98.66 764 98.59 98.74 98.57 762 98.86 98.72 98.60 760 98.56 98.56 98.54 758 98.62 98.97 98.72 756 99.05 98.68 98.52 754 98.63 98.78 98.67 752 98.39 98.50 98.70 750 98.58 98.47 98.34 748 98.39 98.38 98.88 746 98.55 98.49 98.66 744 98.40 98.76 98.64 742 98.44 98.31 98.55 740 98.26 98.83 98.49 738 98.55 98.46 98.67 736 98.38 98.61 98.63 734 98.44 98.36 98.36 732 98.53 98.50 98.27 730 98.53 98.47 98.67 728 98.36 98.43 98.55 726 98.41 98.68 98.48 724 98.27 98.43 98.37 722 98.42 98.71 98.45 720 98.38 98.61 98.56 718 98.61 98.38 98.73 716 98.40 98.36 98.57 714 98.54 98.64 98.59 712 98.55 98.39 98.73 710 98.54 98.21 98.60 708 98.39 98.15 98.40 706 98.19 98.31 98.29 704 98.06 98.48 98.24 702 98.49 98.26 98.85 700 98.50 98.22 98.41 698 98.22 98.24 98.39 696 98.56 98.28 98.41 694 98.48 98.49 98.31 692 98.39 98.27 98.28 690 98.09 98.43 98.32 688 98.36 98.37 98.49 686 98.03 98.06 98.53 684 98.27 98.39 98.45 682 97.95 97.96 98.43 680 97.99 98.15 98.17 678 98.03 98.23 98.37 676 98.45 98.07 98.16 674 98.38 98.30 98.01 672 98.35 97.96 98.15 670 98.33 98.28 98.24 668 97.92 98.00 98.21 666 97.98 97.99 98.14 664 97.87 97.97 98.21 662 98.00 98.12 98.24 660 98.13 97.83 98.10 658 97.89 97.91 98.04 656 97.96 97.97 98.06 654 97.74 97.53 98.17 652 97.75 97.64 97.91 650 98.10 97.88 97.85 648 97.87 97.70 97.84 646 97.77 97.73 97.91 644 97.83 97.74 97.91 642 97.66 97.82 97.77 640 97.83 97.64 97.75 638 97.64 97.76 97.96 636 97.86 97.67 97.71 634 97.59 97.52 97.83 632 97.46 97.47 97.75 630 97.70 97.67 97.88 628 97.63 97.55 97.63 626 97.61 97.64 97.48 624 97.40 97.61 97.75 622 97.50 97.69 97.55 620 97.68 97.52 97.54 618 97.81 97.54 97.62 616 97.52 97.47 97.60 614 96.98 97.49 97.71 612 97.58 97.36 97.69 610 97.38 97.26 97.53 608 97.60 97.36 97.77 606 97.47 97.39 97.40 604 97.31 97.38 97.24 602 97.33 96.99 97.41 600 97.23 97.24 97.17 598 97.26 96.98 97.14 596 97.29 97.15 97.17 594 97.27 96.96 97.31 592 97.04 97.17 97.04 590 97.16 97.17 97.37 588 96.89 97.05 97.08 586 97.10 97.21 96.86 584 96.82 96.88 97.08 582 96.92 97.01 96.98 580 96.92 97.16 97.01 578 96.92 96.88 97.08 576 96.97 96.79 97.05 574 96.58 96.80 96.94 572 96.81 96.73 96.77 570 96.59 96.63 96.93 568 96.68 96.50 96.74 566 96.73 96.43 96.59 564 96.79 96.65 96.65 562 96.54 96.36 96.49 560 96.54 96.45 96.58 558 96.29 96.32 96.58 556 96.32 96.39 96.11 554 96.11 96.21 96.23 552 96.38 96.14 96.49 550 96.19 96.15 96.33 548 96.06 96.03 96.13 546 96.11 95.95 96.27 544 96.01 96.29 96.17 542 96.12 95.96 95.89 540 96.03 95.83 95.91 538 95.77 95.76 95.91 536 95.78 95.85 95.91 534 95.79 95.54 95.85 532 95.59 95.44 95.79 530 95.75 95.66 95.72 528 95.40 95.45 95.69 526 95.49 95.16 95.49 524 95.38 95.39 95.29 522 95.25 95.26 95.47 520 95.06 95.30 95.24 518 95.11 94.83 95.03 516 94.97 94.86 95.01 514 95.08 94.80 95.00 512 94.81 94.72 95.15 510 94.50 94.86 94.80 508 94.52 94.73 94.44 506 94.28 94.54 94.85 504 94.35 94.26 94.45 502 94.41 94.42 94.28 500 94.10 94.23 94.23 498 93.65 93.86 94.25 496 94.02 93.81 93.95 494 93.63 93.67 93.72 492 93.35 93.65 93.84 490 93.53 93.44 93.77 488 93.16 93.35 93.43 486 93.12 93.02 93.29 484 92.91 92.87 93.08 482 92.83 92.97 92.99 480 92.53 92.59 92.97 478 92.36 92.49 92.69 476 92.27 92.38 92.23 474 91.92 92.13 91.92 472 91.84 91.90 92.04 470 91.54 91.76 91.90 468 91.15 91.48 91.91 466 90.70 91.18 91.02 464 90.76 90.95 91.24 462 90.77 90.82 90.76 460 90.30 90.14 90.62 458 90.12 89.76 90.31 456 89.88 89.89 90.19 454 89.23 90.03 89.42 452 89.43 89.54 89.47 450 88.63 89.01 89.11 448 88.82 89.01 88.96 446 88.33 88.53 88.57 444 88.13 88.11 88.72 442 87.86 88.33 87.86 440 87.04 87.65 87.46 438 87.45 87.42 87.62 436 86.89 87.33 87.09 434 86.29 86.83 87.28 432 86.36 86.28 86.38 430 85.96 86.64 86.03 428 86.06 85.78 85.34 426 85.17 85.55 85.42 424 84.67 85.04 84.71 422 84.76 84.40 84.75 420 84.05 84.42 84.45 418 83.87 84.16 84.05 416 83.26 84.07 83.51 414 83.13 83.49 82.87 412 82.42 82.99 82.72 410 82.53 82.75 82.71 408 81.97 81.62 81.95 406 81.81 81.25 81.48 404 81.23 80.69 81.11 402 80.63 79.88 80.10 400 79.46 80.05 79.52 398 78.61 79.19 79.35 396 77.97 78.82 78.72 394 77.31 77.69 77.84 392 77.45 77.60 76.95 390 76.74 76.86 76.29 388 75.83 76.13 76.58 386 75.06 75.06 75.50 384 75.09 75.73 75.34 382 73.82 74.18 74.94 380 74.53 74.73 74.09 1650 99.31 99.23 99.28 1640 99.29 99.25 99.28 1630 99.30 99.25 99.29 1620 99.31 99.24 99.30 1610 99.30 99.25 99.30 1600 99.32 99.24 99.29 1590 99.30 99.25 99.29 1580 99.29 99.24 99.28 1570 99.30 99.25 99.29 1560 99.28 99.24 99.29 1550 99.29 99.23 99.28 1540 99.28 99.24 99.28 1530 99.29 99.23 99.28 1520 99.27 99.24 99.28 1510 99.29 99.24 99.27 1500 99.28 99.24 99.27 1490 99.28 99.23 99.27 1480 99.28 99.23 99.27 1470 99.27 99.22 99.26 1460 99.27 99.21 99.26 1450 99.26 99.22 99.26 1440 99.26 99.22 99.26 1430 99.25 99.22 99.27 1420 99.26 99.21 99.25 1410 99.25 99.21 99.25 1400 99.26 99.20 99.24 1390 99.25 99.21 99.25 1380 99.25 99.20 99.24 1370 99.25 99.19 99.24 1360 99.24 99.20 99.24 1350 99.23 99.19 99.24 1340 99.23 99.19 99.24 1330 99.22 99.19 99.23 1320 99.22 99.19 99.22 1310 99.22 99.19 99.23 1300 99.21 99.18 99.22 1290 99.22 99.19 99.23 1280 99.21 99.17 99.22 1270 99.20 99.17 99.21 1260 99.21 99.16 99.22 1250 99.20 99.16 99.21 1240 99.21 99.16 99.21 1230 99.21 99.15 99.21 1220 99.20 99.15 99.19 1210 99.19 99.14 99.19 1200 99.18 99.13 99.18 1190 99.19 99.13 99.19 1180 99.18 99.12 99.18 1170 99.18 99.12 99.17 1160 99.17 99.11 99.16 1150 99.17 99.11 99.16 1140 99.14 99.10 99.14 1130 99.15 99.10 99.14 1120 99.15 99.07 99.14 1110 99.12 99.08 99.14 1100 99.12 99.07 99.13 1090 99.11 99.07 99.12 1080 99.11 99.05 99.11 1070 99.09 99.03 99.11 1060 99.08 99.04 99.08 1050 99.08 99.02 99.08 1040 99.07 99.01 99.07 1030 99.06 99.00 99.06 1020 99.04 98.99 99.05 1010 99.03 98.97 99.04 1000 99.02 98.96 99.02 990 99.01 98.94 99.01 980 98.99 98.94 99.00 970 98.97 98.93 98.98 960 98.94 98.90 98.97 950 98.94 98.88 98.95