# 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 2020-02-19 (104 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 98.62 99.64 98.53 998 98.76 99.22 99.22 996 99.10 98.96 98.52 994 98.75 99.75 99.97 992 98.73 99.50 99.05 990 99.37 98.69 98.57 988 98.14 99.60 99.24 986 99.54 99.26 99.31 984 98.80 99.59 99.49 982 99.73 99.36 99.08 980 98.97 99.72 98.64 978 98.98 99.55 98.91 976 98.77 99.58 98.44 974 98.76 98.98 98.69 972 99.06 98.68 99.75 970 98.70 98.84 98.89 968 99.49 98.48 99.12 966 98.79 98.77 100.00 964 98.70 98.66 98.45 962 99.49 99.18 99.19 960 99.25 99.02 98.78 958 99.32 99.48 99.30 956 99.23 99.17 98.75 954 99.39 99.12 98.80 952 99.31 99.73 98.65 950 99.09 98.77 99.09 948 99.50 99.03 99.12 946 99.01 99.73 98.83 944 99.02 98.82 99.26 942 99.18 99.37 99.16 940 99.09 98.69 98.98 938 99.06 99.18 99.39 936 98.91 98.90 99.03 934 98.86 99.46 99.35 932 98.65 99.15 99.40 930 99.10 98.98 99.15 928 98.33 98.66 99.12 926 98.95 99.28 98.35 924 99.49 99.63 99.26 922 98.90 99.49 98.91 920 98.80 99.05 99.70 918 98.69 98.93 98.98 916 98.76 99.09 99.61 914 99.04 99.12 99.25 912 99.24 99.24 98.81 910 98.91 98.91 98.47 908 98.90 99.17 98.92 906 98.89 99.43 99.05 904 99.39 99.25 99.12 902 99.30 99.41 98.97 900 98.89 99.06 98.92 898 98.91 98.76 99.34 896 98.94 99.22 98.87 894 99.04 99.01 98.63 892 99.04 99.00 99.38 890 98.93 98.82 98.79 888 98.63 99.05 98.94 886 99.05 98.71 98.95 884 98.80 99.22 98.92 882 99.15 99.09 98.40 880 99.12 98.92 98.80 878 98.69 99.15 98.84 876 98.93 98.70 99.04 874 99.03 99.14 98.95 872 98.72 98.86 99.27 870 98.99 98.96 98.90 868 98.93 99.01 98.79 866 98.90 99.19 98.91 864 99.41 99.03 98.84 862 98.88 98.67 98.61 860 98.41 98.66 98.82 858 99.04 98.81 99.10 856 99.23 98.98 98.90 854 99.15 99.11 98.91 852 98.52 99.10 99.01 850 98.86 98.92 98.96 848 98.63 99.04 98.96 846 98.67 99.10 98.93 844 98.86 98.93 98.62 842 98.69 98.96 98.81 840 99.07 99.24 98.58 838 98.59 98.72 99.20 836 98.72 98.92 99.37 834 98.85 99.30 98.81 832 98.79 99.28 99.26 830 98.99 98.85 98.90 828 98.92 98.73 99.31 826 98.62 99.07 98.62 824 98.99 98.88 98.87 822 99.01 98.82 98.60 820 98.74 98.40 98.95 818 98.97 98.91 98.80 816 98.88 99.03 98.70 814 98.61 98.92 98.77 812 98.93 98.54 98.80 810 98.34 99.00 98.70 808 98.83 99.23 98.96 806 98.62 99.20 98.93 804 98.68 98.65 99.13 802 98.75 98.75 98.61 800 99.14 99.07 99.07 798 98.62 98.97 98.86 796 98.73 98.68 99.14 794 99.07 99.13 98.78 792 98.58 98.87 98.47 790 98.64 99.01 98.74 788 98.74 98.55 98.77 786 98.82 98.69 98.71 784 98.84 98.51 98.92 782 98.77 98.42 98.92 780 99.01 99.08 98.36 778 98.79 98.88 98.71 776 98.80 98.95 99.02 774 98.92 98.81 98.62 772 98.73 98.98 98.61 770 98.73 98.66 98.87 768 98.83 99.05 98.99 766 98.77 98.76 98.72 764 99.01 98.55 98.80 762 98.79 98.73 98.63 760 98.63 98.73 99.03 758 98.92 98.87 98.90 756 98.87 98.76 98.77 754 98.67 98.92 98.64 752 98.93 98.79 99.08 750 98.90 98.73 98.94 748 98.81 98.76 98.72 746 98.59 98.75 98.69 744 98.73 98.72 98.88 742 98.81 98.91 99.04 740 98.57 98.93 98.74 738 98.44 98.92 98.74 736 99.02 98.89 98.69 734 98.65 98.76 98.76 732 98.61 98.81 99.08 730 98.92 98.66 98.99 728 98.62 98.67 98.96 726 98.66 98.45 98.80 724 98.85 98.92 98.53 722 98.51 98.66 98.63 720 98.67 98.96 98.38 718 98.80 98.78 98.74 716 98.75 98.27 98.60 714 98.62 98.49 98.76 712 98.73 98.67 98.63 710 98.68 98.39 98.48 708 98.67 98.59 98.57 706 98.77 98.66 98.74 704 98.87 98.81 98.60 702 98.58 98.84 98.58 700 98.61 98.54 98.93 698 98.57 98.96 98.55 696 98.56 98.61 98.47 694 98.55 98.65 98.68 692 98.64 98.61 98.62 690 98.71 98.51 98.93 688 98.63 98.66 98.66 686 98.62 98.38 98.62 684 98.35 98.45 98.68 682 98.55 98.69 98.60 680 98.74 98.57 98.61 678 98.63 98.69 98.74 676 98.56 98.69 98.63 674 98.63 98.65 98.62 672 98.59 98.54 98.57 670 98.39 98.63 98.62 668 98.80 98.47 98.62 666 98.51 98.61 98.49 664 98.55 98.77 98.49 662 98.48 98.53 98.55 660 98.44 98.49 98.52 658 98.52 98.61 98.49 656 98.56 98.30 98.54 654 98.45 98.50 98.43 652 98.42 98.54 98.46 650 98.28 98.59 98.58 648 98.21 98.38 98.46 646 98.59 98.49 98.41 644 98.52 98.33 98.47 642 98.45 98.24 98.40 640 98.44 98.36 98.52 638 98.37 98.30 98.48 636 98.30 98.41 98.31 634 98.41 98.40 98.43 632 98.59 98.37 98.53 630 98.51 98.45 98.49 628 98.24 98.26 98.45 626 98.41 98.45 98.33 624 98.30 98.30 98.35 622 98.36 98.27 98.30 620 98.40 98.44 98.13 618 98.27 98.44 98.28 616 98.59 98.27 98.45 614 98.36 98.36 98.52 612 98.52 98.25 98.60 610 98.27 98.16 98.45 608 98.42 98.44 98.37 606 98.29 98.35 98.42 604 98.23 98.26 98.37 602 98.35 98.28 98.38 600 98.09 98.21 98.27 598 98.26 98.28 98.28 596 98.30 98.33 98.41 594 98.30 98.17 98.26 592 98.36 98.23 98.24 590 98.09 98.20 98.25 588 98.10 98.06 98.20 586 98.06 98.18 98.12 584 98.12 98.17 98.26 582 98.00 98.07 97.99 580 97.99 98.28 98.17 578 98.06 97.88 98.20 576 97.95 98.06 98.22 574 98.19 98.07 98.00 572 98.16 98.14 98.12 570 98.14 97.92 98.11 568 98.32 97.91 97.94 566 97.85 97.90 98.09 564 98.09 97.95 97.98 562 97.89 97.93 98.02 560 97.94 98.11 97.94 558 98.02 97.90 97.85 556 97.96 97.84 98.01 554 98.01 97.80 97.92 552 97.93 97.79 97.89 550 97.77 97.82 97.81 548 97.75 97.69 97.95 546 97.78 98.01 97.89 544 97.91 97.96 97.95 542 97.90 97.68 97.99 540 97.71 97.74 97.87 538 97.75 97.79 97.84 536 97.86 97.83 97.81 534 97.54 97.75 97.72 532 97.86 97.51 97.72 530 97.58 97.86 97.44 528 97.77 97.65 97.74 526 97.75 97.66 97.48 524 97.80 97.75 97.64 522 97.87 97.43 97.49 520 97.50 97.56 97.27 518 97.51 97.37 97.61 516 97.53 97.41 97.62 514 97.28 97.52 97.64 512 97.41 97.53 97.36 510 97.46 97.21 97.48 508 97.45 97.09 97.31 506 97.40 97.20 97.13 504 97.16 97.27 97.65 502 97.22 97.02 97.20 500 97.13 97.20 97.26 498 96.98 97.07 97.18 496 97.21 97.00 97.20 494 97.23 97.12 96.80 492 97.06 97.05 96.63 490 96.94 96.98 96.82 488 96.76 96.75 96.88 486 97.12 96.77 96.87 484 96.69 96.71 96.76 482 96.71 96.49 96.82 480 96.52 96.65 96.48 478 96.63 96.41 96.54 476 96.61 96.33 96.45 474 96.42 96.30 96.44 472 96.33 96.24 96.13 470 96.03 96.11 96.41 468 96.37 96.28 96.36 466 96.11 96.19 96.13 464 95.89 95.75 95.83 462 96.02 95.98 95.74 460 96.02 95.96 95.84 458 95.61 95.77 96.10 456 95.82 95.48 95.71 454 95.73 95.71 95.83 452 95.33 95.67 95.65 450 95.34 95.49 95.50 448 95.65 95.58 95.43 446 96.01 95.09 95.56 444 95.31 95.16 94.91 442 95.12 94.90 94.78 440 95.02 95.03 95.13 438 95.02 94.75 94.81 436 94.72 94.88 95.23 434 94.52 94.39 94.62 432 94.77 94.92 94.54 430 94.43 94.27 94.11 428 94.37 94.35 94.25 426 94.39 93.68 94.35 424 94.06 94.32 94.07 422 93.80 94.33 93.94 420 93.59 93.50 93.99 418 94.27 93.32 93.67 416 93.81 93.37 93.58 414 92.79 93.58 93.52 412 93.11 93.58 93.19 410 93.40 93.24 93.00 408 93.59 92.96 93.15 406 92.88 93.06 92.86 404 92.96 91.95 92.35 402 92.47 92.50 92.53 400 92.91 92.22 92.05 398 91.85 92.19 92.01 396 92.00 92.01 92.53 394 91.93 92.26 91.91 392 91.37 91.50 91.53 390 91.29 91.01 92.10 388 90.72 91.06 91.02 386 90.56 90.76 91.42 384 90.64 90.89 90.79 382 89.89 89.60 89.74 380 89.22 89.19 89.80 1650 99.29 99.26 99.27 1640 99.28 99.27 99.27 1630 99.28 99.27 99.27 1620 99.28 99.27 99.27 1610 99.28 99.27 99.27 1600 99.28 99.27 99.26 1590 99.27 99.27 99.26 1580 99.27 99.27 99.26 1570 99.27 99.26 99.27 1560 99.27 99.27 99.25 1550 99.27 99.26 99.25 1540 99.27 99.26 99.26 1530 99.26 99.25 99.25 1520 99.26 99.26 99.26 1510 99.27 99.25 99.25 1500 99.26 99.25 99.25 1490 99.27 99.25 99.24 1480 99.26 99.25 99.25 1470 99.26 99.25 99.25 1460 99.26 99.25 99.24 1450 99.26 99.24 99.24 1440 99.25 99.26 99.23 1430 99.25 99.23 99.24 1420 99.25 99.24 99.23 1410 99.25 99.23 99.24 1400 99.25 99.23 99.23 1390 99.25 99.24 99.24 1380 99.24 99.23 99.24 1370 99.24 99.22 99.23 1360 99.24 99.22 99.22 1350 99.24 99.22 99.22 1340 99.23 99.23 99.22 1330 99.23 99.22 99.22 1320 99.23 99.22 99.21 1310 99.22 99.22 99.22 1300 99.22 99.21 99.22 1290 99.22 99.22 99.21 1280 99.21 99.21 99.21 1270 99.21 99.21 99.21 1260 99.22 99.21 99.20 1250 99.21 99.21 99.21 1240 99.21 99.20 99.20 1230 99.21 99.21 99.19 1220 99.21 99.20 99.19 1210 99.21 99.20 99.19 1200 99.20 99.19 99.19 1190 99.20 99.19 99.19 1180 99.19 99.18 99.19 1170 99.19 99.18 99.17 1160 99.19 99.18 99.17 1150 99.18 99.17 99.17 1140 99.19 99.17 99.17 1130 99.17 99.16 99.17 1120 99.17 99.16 99.16 1110 99.18 99.15 99.16 1100 99.16 99.15 99.15 1090 99.16 99.15 99.14 1080 99.15 99.14 99.15 1070 99.15 99.14 99.14 1060 99.15 99.14 99.12 1050 99.14 99.13 99.12 1040 99.13 99.12 99.12 1030 99.12 99.12 99.11 1020 99.12 99.10 99.10 1010 99.10 99.09 99.09 1000 99.10 99.09 99.08 990 99.10 99.08 99.07 980 99.08 99.07 99.06 970 99.07 99.07 99.04 960 99.07 99.05 99.04 950 99.06 99.04 99.03