# 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 2024-12-04 (1854 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 98.36 98.36 98.86 998 99.01 99.83 99.83 996 99.39 99.07 98.96 994 98.42 99.03 99.14 992 98.77 98.84 99.11 990 98.50 98.72 99.43 988 99.49 98.41 100.23 986 98.51 99.34 99.95 984 99.36 98.98 98.72 982 98.38 99.16 98.40 980 98.34 98.78 99.07 978 98.59 98.94 98.93 976 98.67 99.35 98.78 974 98.61 99.67 98.44 972 98.95 99.83 99.45 970 99.11 100.02 99.71 968 99.64 99.25 99.10 966 98.05 99.08 98.85 964 98.95 98.90 99.04 962 98.65 99.57 99.30 960 98.88 98.75 99.14 958 98.81 98.92 98.71 956 98.95 98.52 98.71 954 98.85 99.24 99.34 952 98.96 98.87 99.31 950 98.38 99.26 99.25 948 98.62 99.10 98.84 946 98.90 98.97 98.93 944 98.59 98.25 98.55 942 98.78 98.76 98.32 940 99.33 98.36 98.81 938 99.02 98.78 98.18 936 98.84 99.20 99.11 934 98.35 99.06 98.68 932 98.73 98.52 98.91 930 98.64 98.92 99.09 928 98.72 98.60 98.61 926 98.44 98.73 98.33 924 98.72 98.61 98.74 922 98.50 98.72 98.64 920 98.63 98.68 98.84 918 98.57 99.02 98.99 916 98.39 98.85 98.79 914 98.44 98.01 99.24 912 98.28 98.91 98.55 910 98.19 98.40 98.84 908 98.62 98.67 98.98 906 98.62 98.57 99.00 904 98.33 98.92 98.76 902 98.66 98.62 99.42 900 98.49 98.41 98.45 898 98.35 98.70 99.06 896 99.19 98.92 98.84 894 98.77 98.95 98.89 892 98.51 98.85 98.95 890 98.72 98.78 99.31 888 98.45 98.75 99.01 886 98.70 98.59 98.90 884 98.61 98.72 98.72 882 98.55 98.87 98.74 880 98.99 98.29 98.74 878 98.47 98.60 98.63 876 98.47 98.83 98.44 874 98.35 98.60 98.58 872 98.84 98.91 99.14 870 98.64 98.88 98.58 868 98.23 98.42 98.65 866 98.33 98.44 98.80 864 98.57 98.88 99.05 862 98.30 98.68 98.81 860 98.72 98.51 98.63 858 98.27 98.48 99.01 856 98.31 98.33 98.79 854 98.37 98.87 98.62 852 98.53 98.73 98.55 850 98.54 98.60 98.34 848 98.93 98.53 98.55 846 98.30 99.41 98.72 844 98.31 98.36 98.56 842 98.78 98.80 98.87 840 98.26 99.11 98.90 838 98.37 98.58 98.39 836 98.17 98.49 98.38 834 98.65 98.27 98.58 832 98.79 98.58 98.49 830 98.37 99.00 98.35 828 98.36 98.44 98.60 826 97.89 98.84 98.11 824 98.19 98.03 98.47 822 98.50 98.70 98.54 820 98.58 98.67 98.37 818 98.09 98.79 99.10 816 98.20 98.28 98.77 814 98.59 98.64 98.83 812 98.46 98.52 98.49 810 98.71 98.50 98.61 808 98.56 98.34 98.82 806 97.95 98.46 98.42 804 98.75 98.07 98.85 802 98.36 98.51 98.50 800 98.44 98.45 98.46 798 98.28 98.66 98.63 796 97.79 98.31 98.49 794 98.38 98.56 98.98 792 98.40 98.18 98.81 790 98.27 98.10 98.32 788 98.48 98.75 98.35 786 98.03 98.76 98.70 784 98.14 98.52 98.62 782 98.52 98.84 98.46 780 98.44 98.50 98.41 778 98.36 98.45 98.40 776 98.06 98.33 98.20 774 98.49 98.64 98.46 772 98.54 98.20 98.50 770 97.91 98.39 98.53 768 97.92 98.61 98.59 766 98.20 98.33 98.52 764 98.43 98.25 98.37 762 98.23 98.53 98.57 760 98.37 98.44 98.33 758 98.09 98.43 98.62 756 98.10 97.99 98.22 754 98.01 98.62 98.62 752 98.14 98.17 98.48 750 98.31 98.40 98.66 748 98.19 98.60 98.25 746 98.39 98.41 98.59 744 98.36 98.41 98.61 742 98.29 98.27 98.34 740 98.12 98.06 97.96 738 98.19 98.42 98.21 736 98.16 98.27 98.60 734 98.32 98.49 98.31 732 98.19 98.50 98.30 730 98.07 98.25 98.43 728 97.98 98.22 98.08 726 97.99 98.32 98.44 724 98.09 98.58 98.39 722 97.86 98.38 98.40 720 98.14 98.16 97.96 718 98.01 97.97 98.27 716 98.03 98.20 98.37 714 98.17 98.19 98.29 712 97.72 98.05 98.14 710 97.81 98.11 98.46 708 97.97 98.18 98.24 706 97.87 98.15 97.99 704 97.77 98.12 98.37 702 98.10 98.05 98.29 700 97.98 98.15 98.27 698 97.73 98.22 98.27 696 97.80 97.96 97.89 694 97.82 97.94 97.96 692 97.89 97.77 98.27 690 97.68 97.97 97.86 688 97.65 97.93 97.91 686 97.74 97.79 98.03 684 97.61 97.97 97.89 682 97.65 97.95 98.03 680 97.70 97.96 97.94 678 97.73 97.77 97.90 676 97.64 97.95 98.08 674 97.58 97.87 97.99 672 97.77 97.91 98.08 670 97.59 97.83 97.98 668 97.74 97.64 97.87 666 97.55 97.70 97.77 664 97.54 97.62 97.91 662 97.44 97.76 97.61 660 97.68 97.50 97.71 658 97.61 97.70 97.82 656 97.33 97.57 97.71 654 97.51 97.63 97.72 652 97.35 97.59 97.79 650 97.27 97.39 97.61 648 97.14 97.69 97.55 646 97.13 97.30 97.27 644 97.02 97.27 97.33 642 97.12 97.55 97.61 640 97.32 97.44 97.41 638 97.12 97.29 97.49 636 97.21 97.29 97.31 634 97.23 97.33 97.30 632 97.18 97.26 97.35 630 96.98 97.39 97.35 628 96.90 97.11 97.55 626 96.99 97.05 97.18 624 96.89 97.02 97.34 622 96.93 97.24 97.19 620 97.02 97.12 97.17 618 96.95 97.17 97.34 616 96.76 97.07 97.03 614 96.84 97.09 97.27 612 96.75 96.98 97.00 610 96.51 96.99 97.01 608 96.72 97.08 97.01 606 96.63 96.85 97.09 604 96.45 97.00 96.71 602 96.33 96.86 96.65 600 96.66 96.83 97.04 598 96.79 96.46 96.99 596 96.37 96.64 96.79 594 96.39 96.55 96.86 592 96.57 96.60 96.91 590 96.31 96.63 96.72 588 96.33 96.41 96.63 586 96.24 96.62 96.62 584 96.38 96.23 96.37 582 96.12 96.42 96.47 580 95.95 96.33 96.41 578 96.05 96.22 96.20 576 96.13 96.30 96.50 574 96.10 96.38 96.48 572 95.75 95.90 96.35 570 95.92 95.98 96.20 568 95.90 96.22 96.24 566 96.05 96.05 96.22 564 95.71 96.13 95.89 562 95.75 95.87 95.87 560 95.52 95.97 95.91 558 95.33 95.86 96.20 556 95.26 95.89 95.68 554 95.21 95.68 95.80 552 95.24 95.82 95.74 550 95.19 95.33 95.56 548 95.06 95.83 95.65 546 95.21 95.39 95.45 544 95.10 95.39 95.56 542 95.08 95.47 95.59 540 94.99 95.08 95.55 538 94.82 95.09 95.50 536 94.74 94.94 95.22 534 94.92 95.02 95.23 532 94.58 94.89 95.03 530 94.51 94.89 95.12 528 94.50 94.69 94.81 526 94.34 94.59 94.75 524 93.98 94.45 94.46 522 94.05 94.45 94.62 520 93.95 94.47 94.63 518 93.87 94.22 94.23 516 93.66 94.09 94.32 514 93.99 93.93 94.01 512 93.67 93.94 93.95 510 93.36 93.55 93.91 508 93.37 93.66 93.65 506 93.30 93.49 93.50 504 93.09 93.36 93.43 502 92.98 93.28 93.45 500 92.80 93.03 92.97 498 92.55 92.89 93.01 496 92.24 92.70 93.03 494 92.35 92.81 92.85 492 92.11 92.34 92.50 490 92.04 92.10 92.23 488 91.96 91.99 92.30 486 91.77 91.85 92.02 484 91.43 91.80 91.54 482 90.92 91.42 91.59 480 91.00 91.23 91.23 478 90.89 91.13 91.35 476 90.51 90.98 91.05 474 90.49 90.39 90.44 472 89.93 90.23 90.53 470 89.85 89.91 90.47 468 89.56 90.39 89.92 466 89.55 89.68 89.51 464 89.12 89.64 89.34 462 88.83 89.07 89.52 460 88.56 88.75 88.79 458 88.42 88.81 88.39 456 88.22 88.39 88.42 454 87.80 88.22 87.81 452 87.34 87.75 88.19 450 87.51 87.46 87.30 448 86.93 87.13 86.99 446 86.52 86.85 86.87 444 86.48 86.76 86.41 442 86.28 86.41 86.37 440 85.49 85.72 85.69 438 85.08 85.06 85.66 436 84.93 85.62 85.23 434 84.29 85.08 84.79 432 84.31 84.43 84.33 430 84.08 84.21 83.84 428 83.35 83.72 83.95 426 82.86 83.37 83.47 424 82.39 82.80 82.68 422 81.82 82.69 82.08 420 81.50 81.98 81.68 418 80.99 81.32 81.52 416 81.04 81.12 81.23 414 80.51 80.64 80.54 412 79.59 79.94 79.99 410 79.27 79.28 79.46 408 78.54 78.62 78.18 406 77.92 78.20 77.69 404 77.39 77.74 77.49 402 76.62 76.96 76.78 400 75.66 75.58 76.33 398 74.26 74.90 75.72 396 75.61 74.36 74.76 394 73.30 74.10 74.45 392 73.81 73.08 73.92 390 72.76 72.71 72.90 388 71.57 71.72 71.28 386 71.38 71.32 71.60 384 70.02 70.93 70.98 382 69.92 70.27 70.68 380 69.41 71.02 70.48 1650 99.14 99.14 99.18 1640 99.14 99.13 99.18 1630 99.13 99.12 99.18 1620 99.15 99.14 99.17 1610 99.12 99.13 99.18 1600 99.14 99.13 99.17 1590 99.14 99.12 99.19 1580 99.13 99.13 99.16 1570 99.14 99.13 99.17 1560 99.13 99.12 99.16 1550 99.13 99.11 99.17 1540 99.13 99.13 99.17 1530 99.13 99.12 99.17 1520 99.13 99.11 99.17 1510 99.12 99.12 99.17 1500 99.13 99.12 99.17 1490 99.12 99.11 99.17 1480 99.12 99.11 99.15 1470 99.12 99.11 99.17 1460 99.13 99.11 99.17 1450 99.12 99.11 99.17 1440 99.11 99.11 99.17 1430 99.10 99.11 99.16 1420 99.10 99.10 99.16 1410 99.11 99.10 99.15 1400 99.10 99.10 99.16 1390 99.10 99.10 99.15 1380 99.10 99.09 99.15 1370 99.09 99.10 99.16 1360 99.09 99.09 99.14 1350 99.09 99.08 99.13 1340 99.09 99.08 99.14 1330 99.08 99.07 99.14 1320 99.07 99.07 99.13 1310 99.06 99.07 99.14 1300 99.06 99.07 99.13 1290 99.07 99.06 99.12 1280 99.06 99.07 99.12 1270 99.05 99.06 99.11 1260 99.05 99.04 99.11 1250 99.03 99.04 99.10 1240 99.04 99.05 99.09 1230 99.03 99.04 99.09 1220 99.01 99.05 99.09 1210 99.01 99.03 99.09 1200 99.00 99.02 99.08 1190 98.99 99.02 99.07 1180 99.00 99.01 99.07 1170 98.98 99.00 99.07 1160 98.97 98.99 99.06 1150 98.96 98.99 99.05 1140 98.96 98.98 99.04 1130 98.96 98.98 99.03 1120 98.94 98.97 99.03 1110 98.92 98.97 99.03 1100 98.93 98.97 99.02 1090 98.93 98.94 99.02 1080 98.90 98.94 99.01 1070 98.89 98.95 99.01 1060 98.88 98.94 99.01 1050 98.89 98.93 99.00 1040 98.86 98.92 98.97 1030 98.86 98.91 98.98 1020 98.84 98.89 98.94 1010 98.84 98.91 98.94 1000 98.81 98.87 98.95 990 98.82 98.87 98.92 980 98.78 98.86 98.92 970 98.79 98.84 98.91 960 98.77 98.82 98.90 950 98.77 98.80 98.88