# 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 2020-05-27 (202 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 99.42 99.25 98.80 998 99.70 98.38 99.25 996 98.86 99.22 98.96 994 99.33 99.39 99.94 992 99.43 99.38 99.85 990 99.17 98.32 98.85 988 99.69 99.76 99.21 986 99.47 99.21 98.88 984 100.04 99.33 99.41 982 99.03 99.25 98.65 980 99.58 98.99 99.34 978 99.06 99.56 99.04 976 98.81 98.79 99.49 974 99.52 98.16 99.21 972 98.98 99.16 99.72 970 99.02 99.02 99.57 968 99.69 98.85 99.09 966 98.53 98.72 98.84 964 98.82 98.98 99.86 962 99.62 99.10 98.91 960 99.53 98.61 99.20 958 99.63 98.54 99.18 956 99.19 98.72 99.27 954 99.16 98.34 99.23 952 98.79 98.66 99.58 950 99.41 98.97 98.99 948 99.16 99.05 99.34 946 99.30 99.58 99.62 944 99.30 99.39 99.33 942 99.14 99.60 99.65 940 98.71 98.89 99.43 938 99.25 99.09 99.48 936 98.95 98.79 98.93 934 99.59 99.52 99.10 932 98.93 98.95 99.12 930 98.89 98.93 99.22 928 98.65 99.04 98.95 926 99.02 99.34 98.97 924 98.98 98.63 99.37 922 98.71 99.14 99.30 920 98.62 99.33 99.20 918 99.05 99.69 98.79 916 99.09 99.10 99.27 914 99.05 98.79 99.17 912 99.18 98.47 99.20 910 98.95 98.83 99.24 908 99.45 99.38 98.68 906 99.26 99.05 99.19 904 99.13 98.98 99.21 902 98.93 98.88 98.86 900 99.43 98.94 98.95 898 98.99 99.04 99.33 896 99.36 99.14 98.94 894 99.04 99.59 99.00 892 99.09 98.87 99.23 890 99.06 98.99 99.29 888 99.21 98.95 99.17 886 99.08 99.03 99.19 884 98.52 98.59 99.32 882 99.18 98.90 99.14 880 99.30 99.01 99.06 878 98.90 98.59 99.33 876 99.29 98.91 98.99 874 98.93 98.93 99.25 872 98.94 99.23 98.96 870 98.91 99.03 99.01 868 99.16 99.11 99.45 866 98.74 98.68 98.84 864 98.67 98.70 99.08 862 98.49 98.62 99.25 860 99.52 98.97 98.74 858 99.29 99.10 98.84 856 99.26 98.85 98.76 854 99.09 99.38 99.19 852 99.12 99.11 99.46 850 98.95 99.24 99.16 848 99.11 98.96 99.31 846 98.54 98.84 99.00 844 98.96 98.53 99.00 842 99.19 99.08 98.92 840 99.27 98.95 99.11 838 98.93 99.01 99.09 836 99.01 99.26 98.81 834 99.17 99.09 99.09 832 98.97 98.85 98.77 830 98.88 99.05 99.12 828 99.28 98.65 98.62 826 98.76 98.97 98.78 824 99.20 98.71 98.77 822 98.59 98.85 99.04 820 99.18 98.94 98.98 818 99.06 98.87 98.89 816 98.96 98.92 98.99 814 98.97 98.63 98.84 812 98.77 99.02 98.76 810 98.80 98.79 98.73 808 98.61 99.05 98.86 806 98.87 98.88 98.99 804 98.73 98.87 98.92 802 99.01 98.89 98.97 800 98.69 99.29 98.89 798 98.70 98.80 98.77 796 98.72 99.13 98.85 794 98.71 98.74 98.92 792 99.08 98.70 99.16 790 98.87 99.00 98.96 788 98.85 99.00 98.62 786 99.07 99.02 98.78 784 98.83 98.73 99.05 782 98.90 98.81 99.09 780 98.82 98.98 98.92 778 98.94 98.84 98.54 776 98.72 98.79 98.74 774 99.01 98.55 98.99 772 98.80 98.89 98.52 770 99.09 98.55 98.85 768 98.74 98.79 99.00 766 98.77 98.61 98.82 764 98.72 98.87 98.93 762 98.97 98.93 98.69 760 98.81 98.62 98.81 758 98.78 98.37 98.58 756 98.73 98.52 98.86 754 98.71 98.89 98.87 752 98.80 98.76 98.80 750 98.64 98.52 98.89 748 98.79 98.58 98.95 746 98.84 98.68 99.15 744 98.43 98.56 98.90 742 98.65 98.76 98.78 740 98.76 98.61 98.81 738 98.83 98.83 98.96 736 99.14 98.91 99.10 734 98.89 98.50 98.76 732 98.46 98.69 98.78 730 98.58 98.75 98.83 728 98.78 98.71 98.79 726 98.65 98.65 98.91 724 98.73 98.71 98.96 722 98.80 98.69 98.98 720 98.80 98.73 98.63 718 98.85 98.81 98.79 716 98.64 98.42 98.89 714 98.65 98.89 98.58 712 98.72 98.60 98.75 710 98.92 98.59 98.49 708 98.63 98.96 98.71 706 98.55 98.61 98.67 704 98.61 98.61 98.89 702 98.84 98.68 98.94 700 98.80 98.61 98.79 698 98.87 98.70 98.95 696 98.71 98.68 98.64 694 98.64 98.85 98.86 692 98.70 98.68 98.72 690 98.49 98.60 98.53 688 98.76 98.60 98.54 686 98.84 98.58 98.63 684 98.53 98.59 98.69 682 98.53 98.57 98.91 680 98.58 98.58 98.87 678 98.58 98.60 98.71 676 98.68 98.54 98.53 674 98.67 98.41 98.64 672 98.55 98.35 98.77 670 98.57 98.41 98.64 668 98.67 98.59 98.55 666 98.46 98.46 98.69 664 98.50 98.62 98.61 662 98.40 98.64 98.43 660 98.56 98.68 98.36 658 98.65 98.51 98.53 656 98.66 98.58 98.47 654 98.57 98.66 98.68 652 98.73 98.64 98.52 650 98.35 98.28 98.71 648 98.46 98.39 98.48 646 98.45 98.56 98.47 644 98.60 98.64 98.51 642 98.67 98.74 98.36 640 98.35 98.29 98.64 638 98.37 98.46 98.37 636 98.27 98.51 98.28 634 98.34 98.21 98.46 632 98.47 98.39 98.37 630 98.36 98.35 98.42 628 98.35 98.44 98.72 626 98.61 98.32 98.38 624 98.62 98.27 98.55 622 98.57 98.22 98.24 620 98.34 98.24 98.57 618 98.45 98.30 98.40 616 98.42 98.20 98.38 614 98.38 98.38 98.29 612 98.35 98.14 98.17 610 98.37 98.28 98.25 608 98.47 98.28 98.30 606 98.48 98.19 98.35 604 98.20 98.07 98.33 602 98.30 98.17 98.28 600 98.36 98.37 98.26 598 98.38 98.34 98.24 596 98.22 98.07 98.31 594 98.29 97.95 98.08 592 98.24 98.18 98.27 590 98.45 98.03 98.26 588 98.35 98.07 98.20 586 98.18 98.16 98.47 584 98.29 98.11 98.24 582 98.11 97.89 98.22 580 98.07 97.92 98.16 578 98.17 97.89 97.98 576 98.13 97.94 97.99 574 98.21 97.91 98.06 572 97.99 98.10 98.29 570 97.91 97.79 98.12 568 98.25 97.95 98.14 566 97.92 97.88 98.21 564 98.00 97.70 98.28 562 98.02 97.75 98.04 560 97.99 97.91 97.99 558 98.02 97.85 97.93 556 97.87 97.72 97.77 554 97.86 98.00 97.98 552 97.89 97.96 97.94 550 97.89 97.76 97.68 548 97.89 97.68 97.71 546 97.88 97.71 97.87 544 97.69 97.47 97.62 542 97.71 97.58 97.94 540 97.74 97.54 97.92 538 97.71 97.45 97.74 536 97.48 97.29 97.73 534 97.81 97.57 97.78 532 97.82 97.65 97.60 530 97.47 97.56 97.75 528 97.61 97.55 97.72 526 97.49 97.61 97.51 524 97.42 97.29 97.48 522 97.68 97.25 97.42 520 97.43 97.54 97.45 518 97.31 97.27 97.35 516 97.38 97.17 97.31 514 97.31 96.96 97.31 512 97.54 97.18 97.38 510 97.34 97.13 97.08 508 97.29 97.11 97.02 506 97.29 96.93 97.24 504 97.18 97.11 97.21 502 97.05 96.89 97.10 500 96.72 96.69 97.06 498 96.70 96.76 97.00 496 96.89 96.74 96.73 494 96.78 96.82 96.75 492 96.87 96.40 96.70 490 96.54 96.43 96.60 488 96.50 96.29 96.33 486 96.67 96.58 96.31 484 96.58 96.53 96.39 482 96.30 96.67 96.23 480 96.38 96.36 96.31 478 96.30 96.09 96.24 476 96.34 96.16 96.04 474 96.18 96.04 96.21 472 96.06 95.81 96.40 470 96.11 96.06 95.74 468 95.98 95.88 95.63 466 96.00 95.66 95.79 464 95.77 95.65 95.45 462 95.67 95.91 95.86 460 95.32 95.33 95.43 458 95.14 94.94 95.23 456 95.28 95.15 95.26 454 95.19 95.19 95.14 452 94.89 94.72 95.03 450 95.00 94.50 94.90 448 94.99 95.09 94.62 446 94.89 94.98 94.79 444 94.73 94.37 94.48 442 94.10 94.41 94.38 440 94.25 94.04 94.38 438 94.23 94.47 94.20 436 93.76 93.82 94.20 434 93.68 93.76 93.84 432 93.92 93.68 94.02 430 94.00 93.42 93.56 428 93.37 93.62 93.66 426 93.75 93.41 93.62 424 93.06 93.86 93.39 422 93.18 93.42 92.90 420 93.20 92.77 92.87 418 92.45 92.93 92.66 416 92.68 92.70 92.12 414 92.97 92.19 92.81 412 92.05 92.48 92.11 410 92.51 92.42 92.13 408 92.33 92.15 92.22 406 92.38 91.71 91.95 404 92.09 92.20 91.20 402 91.17 91.07 90.99 400 91.20 90.87 91.24 398 90.54 91.09 90.94 396 91.58 90.82 91.33 394 91.35 91.21 90.15 392 90.51 90.48 90.52 390 90.30 89.72 90.07 388 90.53 89.35 89.07 386 89.75 88.80 89.49 384 89.69 89.15 89.34 382 88.30 88.14 88.83 380 87.46 88.46 87.62 1650 99.49 99.42 99.49 1640 99.48 99.43 99.48 1630 99.50 99.42 99.49 1620 99.49 99.43 99.50 1610 99.49 99.42 99.50 1600 99.49 99.43 99.49 1590 99.49 99.42 99.49 1580 99.49 99.42 99.50 1570 99.50 99.43 99.49 1560 99.48 99.43 99.48 1550 99.49 99.43 99.50 1540 99.49 99.44 99.49 1530 99.49 99.43 99.50 1520 99.49 99.43 99.49 1510 99.49 99.44 99.49 1500 99.49 99.44 99.49 1490 99.50 99.44 99.49 1480 99.47 99.44 99.47 1470 99.50 99.43 99.48 1460 99.47 99.44 99.48 1450 99.49 99.44 99.49 1440 99.49 99.43 99.48 1430 99.49 99.43 99.49 1420 99.48 99.44 99.49 1410 99.48 99.43 99.48 1400 99.47 99.42 99.48 1390 99.47 99.43 99.47 1380 99.46 99.44 99.47 1370 99.47 99.43 99.47 1360 99.47 99.42 99.47 1350 99.46 99.42 99.46 1340 99.46 99.42 99.47 1330 99.45 99.41 99.45 1320 99.46 99.41 99.47 1310 99.46 99.40 99.45 1300 99.45 99.40 99.46 1290 99.44 99.40 99.45 1280 99.45 99.40 99.45 1270 99.44 99.39 99.43 1260 99.43 99.39 99.44 1250 99.43 99.39 99.45 1240 99.43 99.38 99.43 1230 99.42 99.37 99.42 1220 99.42 99.37 99.42 1210 99.42 99.37 99.42 1200 99.40 99.36 99.41 1190 99.40 99.35 99.40 1180 99.40 99.34 99.40 1170 99.39 99.33 99.40 1160 99.39 99.34 99.39 1150 99.38 99.32 99.39 1140 99.37 99.32 99.38 1130 99.37 99.30 99.37 1120 99.36 99.31 99.37 1110 99.36 99.30 99.37 1100 99.36 99.30 99.36 1090 99.35 99.29 99.34 1080 99.33 99.28 99.35 1070 99.32 99.27 99.34 1060 99.33 99.27 99.33 1050 99.33 99.27 99.31 1040 99.31 99.26 99.32 1030 99.31 99.25 99.30 1020 99.28 99.23 99.30 1010 99.28 99.23 99.29 1000 99.27 99.21 99.27 990 99.26 99.22 99.27 980 99.24 99.19 99.24 970 99.23 99.19 99.22 960 99.21 99.14 99.24 950 99.20 99.17 99.22