# 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 2023-01-09 (1159 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 99.48 99.44 99.98 998 98.92 98.93 98.92 996 100.09 98.51 99.46 994 98.72 99.73 98.59 992 98.05 98.86 99.66 990 99.65 99.70 98.93 988 99.97 99.21 99.31 986 99.02 98.53 98.79 984 98.44 98.81 99.35 982 99.13 99.13 99.37 980 100.16 99.37 99.03 978 99.15 98.56 98.63 976 99.93 99.14 99.18 974 99.67 99.33 99.96 972 98.60 99.80 99.76 970 99.00 99.35 99.51 968 99.15 99.55 98.85 966 99.41 98.85 98.82 964 99.25 99.50 99.45 962 99.75 99.35 99.71 960 99.12 98.62 99.18 958 99.75 99.70 99.46 956 99.33 99.50 99.39 954 99.70 99.02 99.47 952 98.97 99.27 99.40 950 99.08 99.29 99.94 948 99.99 99.23 99.87 946 99.28 99.22 99.52 944 99.01 98.93 98.78 942 99.81 98.85 99.51 940 99.08 99.42 99.17 938 99.56 99.11 98.56 936 99.46 98.51 99.17 934 98.86 99.12 99.45 932 99.20 99.86 98.69 930 98.46 98.63 99.09 928 99.20 98.91 99.14 926 99.38 98.76 98.74 924 98.89 98.89 99.79 922 99.08 98.94 99.24 920 98.74 99.68 99.71 918 99.43 99.08 99.47 916 99.11 99.10 99.01 914 98.84 99.50 98.94 912 98.77 98.97 98.97 910 99.24 99.26 99.28 908 98.97 99.22 98.51 906 99.42 99.13 99.16 904 98.85 98.61 98.84 902 98.84 98.66 98.74 900 99.35 98.85 99.13 898 99.02 98.81 99.63 896 99.20 99.09 99.42 894 99.28 99.13 98.95 892 99.15 99.20 98.95 890 99.11 99.07 99.02 888 99.08 98.84 99.11 886 98.85 98.89 98.81 884 98.82 99.06 98.76 882 98.71 99.37 99.26 880 98.90 98.71 99.36 878 99.15 98.93 99.14 876 99.38 98.65 98.72 874 99.08 98.69 99.17 872 99.24 98.85 99.38 870 98.98 98.76 98.66 868 99.07 99.36 99.47 866 99.07 99.13 99.28 864 98.74 98.80 98.84 862 99.12 98.80 98.95 860 98.98 99.22 99.13 858 99.11 99.08 99.21 856 98.86 99.16 99.29 854 98.71 99.01 98.67 852 99.34 98.56 98.95 850 98.74 98.45 98.69 848 98.97 99.00 99.46 846 99.42 98.79 98.87 844 98.98 98.83 98.88 842 98.99 99.02 98.92 840 99.04 99.29 99.11 838 99.39 98.91 99.16 836 98.80 98.96 98.92 834 99.07 98.66 99.21 832 98.97 99.09 98.71 830 98.86 99.13 98.97 828 98.88 98.94 98.70 826 98.90 98.94 98.66 824 99.55 99.11 99.15 822 99.35 99.12 98.83 820 99.13 99.30 98.82 818 98.90 98.89 98.84 816 99.30 99.16 98.75 814 98.88 99.08 99.12 812 98.88 98.89 99.29 810 98.81 98.91 98.79 808 99.08 98.90 98.94 806 98.88 99.15 99.30 804 98.86 98.74 98.45 802 99.08 98.62 98.63 800 98.99 98.92 98.95 798 98.76 98.96 98.90 796 98.95 98.88 98.77 794 98.63 98.46 98.66 792 98.51 98.69 98.99 790 98.83 98.95 98.58 788 98.60 98.40 98.78 786 98.93 99.26 98.80 784 98.52 98.82 98.67 782 98.77 98.74 98.83 780 98.93 98.81 98.81 778 98.86 98.78 98.80 776 98.45 98.53 98.92 774 98.64 98.83 99.12 772 98.78 98.62 98.36 770 98.80 98.92 98.78 768 98.74 99.15 98.67 766 98.89 98.54 98.81 764 98.91 98.81 98.80 762 98.79 98.58 98.59 760 98.36 98.58 98.36 758 98.93 99.05 98.59 756 98.83 98.99 98.74 754 98.52 98.74 98.81 752 98.78 98.85 98.50 750 98.71 98.68 98.83 748 98.62 98.60 98.56 746 98.48 98.51 98.25 744 98.59 98.56 98.53 742 98.49 98.56 98.87 740 98.87 98.81 98.53 738 98.68 98.66 98.70 736 98.59 98.56 98.65 734 98.36 98.52 98.72 732 98.32 98.59 98.36 730 98.67 98.73 98.63 728 98.69 98.56 98.76 726 98.29 98.53 98.36 724 98.53 98.67 98.49 722 98.67 98.58 98.33 720 98.26 98.65 98.45 718 98.49 98.29 98.47 716 98.37 98.48 98.46 714 98.46 98.47 98.32 712 98.66 98.68 98.66 710 98.61 98.27 98.35 708 98.59 98.69 98.43 706 98.28 98.42 98.35 704 98.21 98.51 98.35 702 98.71 98.58 98.32 700 98.50 98.45 98.17 698 98.35 98.25 98.36 696 98.63 98.43 98.22 694 98.44 98.42 98.39 692 98.47 98.52 98.39 690 98.51 98.27 98.37 688 98.32 98.31 98.26 686 98.09 98.25 98.45 684 98.26 98.44 98.14 682 98.25 98.34 98.29 680 98.10 98.36 98.23 678 98.15 98.33 98.27 676 98.22 98.31 98.16 674 98.00 98.28 98.09 672 98.12 98.20 98.08 670 98.03 98.06 98.01 668 98.34 98.43 98.19 666 98.10 97.98 98.26 664 97.94 98.21 98.22 662 98.23 98.38 97.94 660 98.13 98.28 97.94 658 98.17 98.17 97.83 656 97.95 98.05 97.79 654 98.08 97.99 97.91 652 98.00 97.88 97.94 650 98.01 98.03 97.81 648 98.01 97.91 97.58 646 98.11 97.84 97.93 644 97.91 97.78 97.85 642 97.75 97.76 97.83 640 97.80 97.79 97.71 638 97.89 97.74 97.60 636 97.94 97.78 97.75 634 97.76 97.86 97.82 632 97.53 97.63 97.76 630 97.72 97.90 97.63 628 97.49 97.79 97.65 626 97.87 97.80 97.70 624 97.74 97.72 97.51 622 97.84 97.78 97.62 620 97.62 97.60 97.60 618 97.44 97.85 97.44 616 97.81 97.76 97.46 614 97.54 97.58 97.50 612 97.54 97.38 97.61 610 97.73 97.72 97.50 608 97.59 97.55 97.54 606 97.49 97.52 97.68 604 97.38 97.59 97.46 602 97.42 97.36 97.35 600 97.34 97.64 97.53 598 97.40 97.38 97.34 596 97.34 97.56 97.31 594 97.22 97.50 97.24 592 97.34 97.28 97.14 590 97.22 97.38 97.13 588 97.41 96.97 97.30 586 97.11 97.31 97.24 584 97.16 97.02 96.97 582 96.99 97.08 96.92 580 96.99 97.00 97.08 578 97.18 96.93 97.19 576 97.18 96.97 96.96 574 97.13 97.15 97.03 572 96.92 96.96 96.96 570 97.03 96.95 96.97 568 97.08 97.17 96.95 566 96.88 96.80 97.08 564 96.97 96.80 96.84 562 96.80 96.65 96.69 560 96.90 96.72 96.79 558 96.80 96.84 96.74 556 96.60 96.67 96.80 554 96.69 96.80 96.70 552 96.63 96.72 96.66 550 96.61 96.64 96.38 548 96.27 96.47 96.44 546 96.77 96.50 96.47 544 96.54 96.48 96.47 542 96.28 96.54 96.29 540 96.42 96.46 96.21 538 96.06 96.24 96.10 536 96.32 96.00 96.06 534 96.21 96.13 96.14 532 96.18 96.36 96.21 530 96.34 96.23 96.03 528 96.07 95.77 95.94 526 95.80 95.89 95.81 524 95.82 95.94 95.95 522 95.64 95.64 95.98 520 95.88 95.89 95.60 518 95.68 95.72 95.69 516 95.67 95.67 95.65 514 95.48 95.29 95.49 512 95.34 95.40 95.23 510 95.50 95.35 95.33 508 95.51 95.48 95.42 506 95.16 95.14 95.03 504 95.16 95.16 94.99 502 95.33 95.10 94.96 500 95.01 95.00 94.82 498 94.83 94.99 94.59 496 94.81 94.84 94.81 494 94.53 94.63 94.80 492 94.80 94.66 94.41 490 94.52 94.34 94.45 488 94.51 94.54 94.35 486 94.57 94.00 94.18 484 94.28 94.07 94.00 482 93.95 94.05 93.94 480 93.85 93.67 94.22 478 93.46 93.50 93.72 476 93.40 93.47 93.36 474 93.28 93.25 93.02 472 93.27 92.97 92.90 470 93.08 92.79 93.17 468 92.68 92.65 92.68 466 92.55 91.93 92.42 464 92.27 92.20 92.37 462 92.07 91.86 91.91 460 91.32 91.49 91.44 458 91.45 91.44 91.01 456 90.55 91.24 90.80 454 90.71 90.33 90.64 452 90.73 90.21 89.91 450 89.97 89.89 89.78 448 89.86 89.81 89.73 446 89.99 89.78 89.49 444 89.32 89.47 89.02 442 89.49 89.30 88.93 440 89.84 89.08 89.19 438 89.31 88.96 88.73 436 88.86 88.68 88.76 434 88.53 88.58 88.55 432 88.70 88.18 88.45 430 88.51 88.11 88.20 428 87.80 87.56 87.47 426 87.58 87.57 87.38 424 87.82 87.20 87.14 422 86.84 87.20 86.57 420 86.96 86.56 86.80 418 86.97 86.40 86.59 416 86.45 86.37 85.99 414 86.17 86.12 85.38 412 85.47 85.65 85.38 410 85.25 85.60 84.98 408 84.66 85.14 84.87 406 84.57 84.83 84.45 404 84.05 84.47 83.27 402 83.20 83.00 83.92 400 82.87 83.10 82.30 398 82.15 83.34 81.92 396 81.69 82.19 82.25 394 81.49 81.31 80.89 392 81.30 81.11 80.64 390 80.27 81.07 81.26 388 79.23 79.88 80.43 386 79.96 79.24 79.68 384 79.45 78.64 78.49 382 79.12 79.40 79.06 380 78.73 77.54 78.14 1650 99.37 99.36 99.34 1640 99.36 99.36 99.31 1630 99.36 99.37 99.34 1620 99.37 99.37 99.32 1610 99.35 99.36 99.32 1600 99.37 99.36 99.31 1590 99.35 99.35 99.31 1580 99.37 99.36 99.32 1570 99.35 99.36 99.31 1560 99.36 99.36 99.31 1550 99.34 99.36 99.31 1540 99.35 99.36 99.31 1530 99.36 99.36 99.31 1520 99.34 99.36 99.30 1510 99.34 99.35 99.30 1500 99.34 99.36 99.32 1490 99.33 99.35 99.30 1480 99.34 99.35 99.30 1470 99.33 99.34 99.30 1460 99.34 99.34 99.29 1450 99.32 99.34 99.29 1440 99.33 99.34 99.29 1430 99.32 99.33 99.30 1420 99.32 99.32 99.29 1410 99.32 99.33 99.29 1400 99.30 99.31 99.29 1390 99.31 99.32 99.26 1380 99.31 99.32 99.28 1370 99.31 99.32 99.27 1360 99.31 99.31 99.28 1350 99.30 99.31 99.29 1340 99.30 99.32 99.27 1330 99.30 99.30 99.27 1320 99.29 99.30 99.28 1310 99.30 99.30 99.28 1300 99.28 99.30 99.26 1290 99.28 99.30 99.26 1280 99.28 99.30 99.26 1270 99.29 99.29 99.26 1260 99.28 99.30 99.26 1250 99.29 99.29 99.25 1240 99.29 99.29 99.25 1230 99.27 99.28 99.25 1220 99.28 99.29 99.25 1210 99.29 99.28 99.25 1200 99.26 99.27 99.24 1190 99.26 99.28 99.24 1180 99.27 99.27 99.23 1170 99.26 99.27 99.22 1160 99.25 99.25 99.22 1150 99.24 99.26 99.22 1140 99.25 99.25 99.22 1130 99.24 99.25 99.21 1120 99.24 99.24 99.21 1110 99.24 99.24 99.19 1100 99.23 99.23 99.19 1090 99.23 99.21 99.19 1080 99.21 99.22 99.17 1070 99.20 99.21 99.18 1060 99.19 99.22 99.17 1050 99.19 99.20 99.17 1040 99.19 99.19 99.16 1030 99.16 99.19 99.15 1020 99.16 99.17 99.15 1010 99.16 99.17 99.14 1000 99.15 99.16 99.14 990 99.14 99.15 99.11 980 99.12 99.14 99.13 970 99.12 99.12 99.11 960 99.11 99.12 99.09 950 99.09 99.11 99.09