# 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 2023-05-19 (1289 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 98.87 98.84 99.58 998 99.36 99.41 99.12 996 99.22 98.80 99.10 994 99.36 98.76 99.66 992 98.56 99.10 98.82 990 99.02 98.45 98.09 988 99.14 98.65 98.40 986 99.00 98.01 99.19 984 98.76 98.76 99.43 982 99.34 99.86 99.04 980 98.86 99.31 99.71 978 99.40 99.77 98.32 976 98.72 98.97 99.02 974 98.60 99.94 98.61 972 98.80 99.17 98.83 970 98.75 98.57 98.42 968 100.11 98.93 99.47 966 99.37 98.68 98.68 964 98.90 98.33 98.12 962 98.35 98.99 99.66 960 98.87 98.60 99.16 958 99.27 98.75 98.68 956 98.40 99.16 98.92 954 98.26 99.09 98.96 952 98.88 98.29 98.31 950 98.86 98.59 98.34 948 99.02 99.21 98.84 946 99.20 99.96 98.58 944 99.04 99.10 98.60 942 99.46 98.76 98.86 940 99.08 98.93 99.35 938 99.22 99.45 98.95 936 98.88 99.33 99.33 934 98.97 98.99 98.82 932 98.63 98.53 98.72 930 98.76 98.94 99.26 928 98.45 99.25 99.22 926 99.39 98.99 99.28 924 99.71 98.65 99.13 922 98.71 98.61 98.84 920 98.89 99.13 98.36 918 99.04 98.56 98.81 916 98.79 98.70 98.81 914 99.08 98.76 99.47 912 99.19 99.08 98.73 910 98.78 99.03 99.01 908 98.87 98.62 98.74 906 99.12 98.74 98.31 904 99.15 99.06 98.55 902 99.26 99.15 98.95 900 98.81 98.86 98.91 898 98.58 98.73 98.74 896 98.53 99.06 99.10 894 99.31 98.25 99.19 892 98.59 98.78 98.65 890 98.85 98.94 98.85 888 98.63 98.81 98.83 886 98.70 99.02 98.94 884 99.08 99.03 99.09 882 98.58 98.88 98.99 880 99.05 98.88 98.68 878 98.76 98.73 98.83 876 99.04 98.85 98.88 874 98.71 98.90 98.98 872 98.64 98.65 98.80 870 98.69 98.94 98.81 868 98.75 98.38 99.00 866 99.08 98.89 98.78 864 98.99 98.65 98.57 862 98.86 98.96 98.83 860 99.40 98.86 98.85 858 99.07 98.95 98.96 856 98.91 98.47 99.17 854 98.89 98.51 98.49 852 98.87 98.85 98.86 850 98.98 98.82 98.78 848 99.08 98.85 99.10 846 99.12 98.85 98.96 844 99.33 99.08 98.46 842 99.02 98.80 98.78 840 98.63 99.00 98.80 838 98.66 99.03 98.32 836 98.73 98.95 98.43 834 99.02 99.03 98.22 832 99.08 99.16 98.55 830 99.01 99.22 98.71 828 98.95 98.88 98.29 826 99.02 99.10 98.63 824 99.11 98.60 98.90 822 98.45 98.44 98.53 820 98.05 98.92 98.82 818 98.70 99.15 98.45 816 98.46 98.72 98.79 814 99.07 99.19 98.64 812 99.23 98.50 98.45 810 98.93 99.23 98.82 808 98.35 98.82 98.64 806 98.62 98.37 99.11 804 98.87 98.21 98.64 802 98.77 98.23 98.64 800 98.30 98.89 98.63 798 98.55 98.79 98.52 796 98.95 98.64 98.92 794 98.65 98.36 98.15 792 98.87 98.34 98.48 790 98.98 98.51 98.50 788 98.85 99.14 98.80 786 98.73 99.21 98.73 784 99.21 98.82 98.90 782 98.83 98.88 98.67 780 98.98 98.59 98.58 778 98.36 98.57 98.68 776 98.49 98.50 98.50 774 98.78 98.41 98.53 772 98.62 98.81 98.55 770 98.44 98.48 98.25 768 98.68 98.83 98.52 766 98.26 98.74 98.80 764 98.61 98.61 98.26 762 98.67 98.45 98.76 760 98.88 98.71 98.40 758 98.49 98.64 98.34 756 98.29 98.65 98.40 754 98.68 98.47 98.17 752 98.42 98.53 98.58 750 98.78 98.69 98.65 748 98.58 98.33 98.52 746 98.54 98.35 98.51 744 98.27 98.37 98.39 742 98.42 98.51 98.54 740 98.43 98.48 98.16 738 98.04 98.65 98.65 736 98.40 98.65 98.51 734 98.36 98.34 98.64 732 98.49 98.54 98.13 730 98.63 98.49 98.73 728 98.61 98.44 98.49 726 98.27 98.60 98.59 724 98.14 98.41 98.50 722 98.31 98.50 98.32 720 98.35 98.29 98.13 718 98.39 98.25 98.52 716 98.40 98.26 98.34 714 98.21 98.39 98.22 712 98.46 98.31 98.46 710 98.55 98.33 98.27 708 98.37 98.23 98.00 706 98.29 98.26 98.30 704 98.24 98.27 98.30 702 98.30 98.19 98.20 700 98.42 98.47 98.37 698 98.43 98.19 98.28 696 98.28 98.23 98.21 694 98.20 98.19 98.40 692 98.05 98.41 98.51 690 97.97 98.37 98.18 688 98.20 98.10 98.10 686 98.23 98.04 98.25 684 98.13 98.27 98.34 682 98.04 97.96 97.88 680 98.02 98.09 98.01 678 97.96 98.21 98.00 676 97.98 98.01 98.22 674 98.05 97.98 97.93 672 98.14 98.25 97.95 670 97.94 98.00 98.16 668 97.88 98.19 97.90 666 98.13 98.12 98.05 664 98.02 97.78 98.24 662 97.81 98.08 97.71 660 97.94 98.06 98.03 658 98.01 97.98 97.91 656 97.75 97.81 97.84 654 97.91 98.10 97.87 652 97.70 97.94 97.81 650 97.50 97.69 97.57 648 97.76 97.73 97.67 646 97.60 97.68 97.78 644 97.73 97.63 97.90 642 97.77 97.59 97.73 640 97.76 97.63 97.75 638 97.61 97.68 97.45 636 97.62 97.75 97.44 634 97.72 97.63 97.38 632 97.50 97.86 97.38 630 97.58 97.70 97.50 628 97.50 97.54 97.39 626 97.42 97.60 97.60 624 97.52 97.58 97.38 622 97.62 97.71 97.67 620 97.53 97.77 97.37 618 97.45 97.46 97.51 616 97.38 97.40 97.33 614 97.69 97.47 97.44 612 97.49 97.45 97.60 610 97.58 97.70 97.46 608 97.52 97.20 97.46 606 97.43 97.44 97.24 604 97.49 97.52 97.42 602 97.32 97.33 97.15 600 97.36 97.29 97.26 598 97.36 97.29 97.33 596 97.11 97.15 97.06 594 97.30 97.25 97.17 592 97.17 97.38 97.18 590 97.24 97.08 97.08 588 97.14 97.24 97.01 586 97.16 97.34 97.10 584 97.10 97.03 97.28 582 97.05 97.12 96.99 580 97.06 97.04 97.06 578 96.92 96.82 96.88 576 97.06 97.14 96.82 574 97.06 96.67 96.82 572 96.99 96.79 97.05 570 96.97 96.75 97.05 568 96.82 96.79 96.70 566 96.79 96.93 96.79 564 96.64 97.19 96.68 562 96.91 96.89 96.56 560 96.76 96.78 96.73 558 96.70 96.58 96.33 556 96.93 96.53 96.48 554 96.74 96.74 96.51 552 96.59 96.73 96.36 550 96.66 96.57 96.35 548 96.65 96.36 96.41 546 96.41 96.18 96.37 544 96.40 96.22 96.17 542 96.11 96.23 96.06 540 96.27 96.24 96.22 538 96.23 95.97 96.11 536 96.04 95.81 95.86 534 96.19 96.08 96.16 532 96.22 96.07 95.70 530 95.94 95.82 96.07 528 95.82 95.96 95.63 526 95.84 95.84 95.43 524 95.61 95.88 95.56 522 95.57 95.73 95.36 520 95.48 95.75 95.37 518 95.47 95.57 95.28 516 95.23 95.32 95.36 514 95.50 95.51 95.18 512 95.15 95.19 95.04 510 95.25 95.20 94.88 508 95.19 95.20 95.25 506 95.19 95.01 94.74 504 94.97 94.70 94.79 502 94.68 94.95 94.84 500 94.67 94.81 94.68 498 94.25 94.66 94.62 496 94.38 94.45 94.23 494 94.45 94.46 94.19 492 94.33 94.27 94.15 490 94.25 93.99 93.66 488 94.29 94.34 94.00 486 93.97 93.80 93.80 484 93.59 93.94 93.25 482 93.53 93.61 93.48 480 93.48 93.47 93.07 478 93.37 93.53 93.34 476 93.34 93.26 92.79 474 92.89 93.20 92.64 472 92.71 92.89 92.75 470 92.67 92.46 92.36 468 92.01 92.51 91.93 466 91.84 92.59 91.90 464 91.80 92.40 91.52 462 91.44 91.52 91.50 460 91.22 91.84 91.00 458 91.30 91.34 91.04 456 91.02 91.16 90.46 454 90.51 90.95 90.23 452 90.26 90.87 90.15 450 90.18 90.33 89.63 448 89.90 90.17 89.41 446 89.72 90.42 89.25 444 89.16 90.16 88.96 442 89.06 89.52 88.92 440 88.77 88.92 88.42 438 88.47 88.73 88.33 436 88.22 88.59 88.31 434 87.81 88.10 88.10 432 87.54 88.14 87.60 430 87.41 87.79 87.09 428 86.96 87.46 87.15 426 87.00 87.12 86.83 424 86.65 86.67 86.04 422 86.56 85.89 85.80 420 85.61 86.45 85.72 418 85.50 85.88 85.72 416 85.48 85.16 85.27 414 84.76 84.45 84.77 412 84.17 84.58 84.38 410 83.60 84.71 84.22 408 83.49 83.80 83.15 406 83.21 83.72 82.56 404 83.04 83.07 82.72 402 82.83 82.87 82.28 400 81.37 83.08 81.09 398 80.92 81.44 81.64 396 81.21 81.63 81.21 394 80.24 81.43 80.63 392 79.73 80.30 79.67 390 78.92 79.52 78.88 388 79.00 78.73 78.59 386 77.68 79.21 77.93 384 78.11 78.65 78.23 382 78.40 77.62 77.81 380 76.33 78.53 75.65 1650 99.25 99.22 99.26 1640 99.25 99.23 99.27 1630 99.24 99.22 99.26 1620 99.26 99.22 99.26 1610 99.26 99.22 99.28 1600 99.25 99.22 99.26 1590 99.26 99.22 99.27 1580 99.24 99.21 99.26 1570 99.25 99.21 99.26 1560 99.24 99.22 99.25 1550 99.25 99.22 99.26 1540 99.24 99.22 99.25 1530 99.25 99.22 99.26 1520 99.25 99.21 99.24 1510 99.25 99.22 99.25 1500 99.25 99.22 99.24 1490 99.26 99.21 99.25 1480 99.25 99.21 99.24 1470 99.25 99.22 99.25 1460 99.25 99.21 99.23 1450 99.25 99.21 99.24 1440 99.26 99.20 99.23 1430 99.26 99.21 99.24 1420 99.26 99.21 99.22 1410 99.25 99.21 99.23 1400 99.26 99.21 99.24 1390 99.25 99.19 99.21 1380 99.25 99.20 99.22 1370 99.26 99.22 99.22 1360 99.25 99.21 99.21 1350 99.24 99.20 99.22 1340 99.24 99.19 99.21 1330 99.22 99.18 99.21 1320 99.23 99.19 99.22 1310 99.23 99.18 99.21 1300 99.22 99.17 99.20 1290 99.22 99.19 99.20 1280 99.23 99.18 99.19 1270 99.22 99.17 99.20 1260 99.21 99.17 99.20 1250 99.22 99.16 99.19 1240 99.19 99.15 99.19 1230 99.20 99.15 99.18 1220 99.19 99.16 99.17 1210 99.19 99.13 99.17 1200 99.18 99.14 99.17 1190 99.18 99.13 99.15 1180 99.17 99.13 99.15 1170 99.16 99.12 99.14 1160 99.17 99.11 99.14 1150 99.16 99.12 99.13 1140 99.15 99.10 99.13 1130 99.14 99.10 99.11 1120 99.13 99.11 99.12 1110 99.13 99.09 99.11 1100 99.14 99.07 99.10 1090 99.11 99.07 99.09 1080 99.13 99.08 99.09 1070 99.12 99.08 99.09 1060 99.11 99.07 99.08 1050 99.10 99.05 99.06 1040 99.10 99.05 99.05 1030 99.09 99.04 99.05 1020 99.08 99.03 99.04 1010 99.09 99.02 99.01 1000 99.06 99.03 99.02 990 99.06 99.02 98.99 980 99.06 99.00 98.99 970 99.05 98.99 98.99 960 99.03 98.96 98.98 950 99.01 98.98 98.97