# 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 2019-11-27 (20 days after) # Measured four times # Data between 950 nm and 1650 nm are also available (SPS-XWW). # Contact: Hirofumi Okita (okita14@naoj.org) # # Wavelength (nm) #1 #2 #3 #4 1000 99.60 99.26 99.59 98.63 998 99.31 98.69 97.91 99.26 996 98.14 98.96 98.38 98.75 994 100.22 99.00 98.47 98.40 992 98.33 99.45 97.92 98.79 990 99.10 99.99 99.43 99.79 988 98.56 98.55 98.72 98.98 986 99.56 98.93 99.28 98.29 984 99.52 99.10 99.05 98.82 982 99.39 98.83 98.85 99.47 980 98.69 99.05 99.22 99.06 978 99.14 98.46 99.00 98.52 976 99.98 99.44 99.19 98.58 974 98.67 99.18 98.89 99.13 972 99.20 99.18 98.84 99.06 970 99.33 98.72 98.81 98.63 968 98.00 98.63 99.55 99.00 966 99.18 99.09 98.70 99.07 964 99.37 98.83 98.59 99.58 962 98.68 99.31 98.64 99.18 960 99.53 99.32 98.82 99.14 958 99.17 98.51 98.53 98.84 956 99.18 98.91 98.21 98.82 954 98.82 99.48 98.68 99.05 952 99.21 99.25 99.11 99.13 950 99.17 99.22 99.41 99.56 948 99.42 99.00 98.71 99.29 946 98.89 99.68 98.93 98.72 944 99.34 99.44 99.08 99.03 942 98.52 98.91 98.87 98.79 940 98.99 99.22 98.51 99.16 938 98.72 98.22 98.94 98.59 936 98.84 98.61 99.12 99.15 934 98.81 98.95 98.58 98.75 932 99.81 98.76 99.22 99.22 930 99.18 98.93 98.85 98.61 928 99.19 99.07 99.00 99.19 926 98.54 98.86 99.12 99.17 924 99.43 99.08 99.13 99.19 922 98.89 99.25 98.88 99.23 920 98.72 99.03 98.55 99.38 918 98.62 99.10 99.11 99.19 916 98.78 98.81 98.98 98.82 914 99.15 99.23 99.05 98.62 912 99.06 99.05 98.84 98.77 910 99.01 99.15 99.31 99.34 908 99.21 98.74 99.24 98.94 906 99.33 99.17 99.17 98.86 904 99.13 99.11 98.80 98.84 902 99.37 99.29 98.58 99.19 900 98.83 99.08 99.15 99.21 898 99.26 99.35 99.14 99.03 896 98.88 98.91 99.08 99.05 894 98.93 99.13 99.20 98.94 892 98.67 98.60 99.17 99.32 890 98.90 99.06 98.85 98.70 888 98.96 98.93 98.78 98.72 886 98.99 98.76 98.59 99.06 884 98.93 98.34 98.96 99.03 882 98.85 98.73 99.05 99.20 880 98.84 98.78 98.70 98.94 878 98.64 99.04 99.01 98.91 876 99.20 98.96 99.12 99.24 874 98.62 99.13 98.99 99.01 872 98.93 99.05 99.14 98.78 870 98.76 98.90 98.80 99.15 868 98.89 99.20 99.14 98.97 866 99.04 98.73 99.05 99.22 864 98.93 98.95 98.97 99.12 862 99.34 98.85 99.09 99.12 860 99.08 99.26 98.93 98.80 858 98.77 99.03 98.76 99.23 856 98.97 98.92 98.95 98.98 854 99.11 99.16 99.00 99.11 852 99.02 98.89 98.76 98.67 850 99.07 99.15 98.45 99.19 848 99.13 99.22 99.05 98.80 846 98.93 99.14 99.07 99.05 844 99.17 99.00 98.88 98.90 842 99.07 98.85 99.05 98.88 840 99.23 99.28 98.93 99.04 838 98.98 99.27 98.94 98.84 836 99.18 98.89 98.88 98.93 834 99.24 99.01 99.02 99.39 832 98.44 99.05 99.33 99.41 830 99.08 98.83 98.79 99.23 828 99.11 98.95 98.76 98.83 826 98.74 98.61 98.89 99.10 824 98.82 98.96 98.48 99.03 822 99.09 98.86 98.33 99.15 820 99.10 98.72 98.81 98.96 818 98.84 98.74 99.09 99.11 816 99.16 98.89 98.74 98.89 814 99.12 98.97 98.80 98.81 812 99.06 98.74 98.68 98.92 810 98.76 99.02 99.09 98.71 808 98.99 99.09 98.98 98.78 806 99.32 98.82 99.06 99.03 804 99.07 99.09 98.96 99.07 802 98.94 98.94 98.56 99.19 800 98.76 98.73 98.95 99.03 798 98.83 99.05 98.93 99.16 796 98.99 99.14 99.00 98.80 794 98.84 99.01 98.88 98.90 792 99.07 98.87 98.88 98.81 790 98.58 99.03 98.87 98.87 788 98.87 98.57 98.81 98.96 786 98.73 98.96 98.83 98.72 784 98.76 98.87 99.08 98.65 782 99.29 99.03 99.12 98.89 780 98.92 98.98 98.55 98.82 778 98.94 98.73 98.68 99.02 776 98.87 98.99 98.97 99.32 774 98.90 99.10 98.75 98.90 772 98.95 98.75 99.05 98.91 770 98.77 98.80 99.01 99.02 768 98.87 99.02 98.90 99.06 766 98.94 98.97 99.00 98.95 764 99.08 98.66 98.59 98.98 762 98.75 98.93 98.73 98.78 760 98.85 99.03 98.82 99.04 758 98.80 98.91 99.07 99.01 756 98.83 98.73 98.67 98.89 754 98.94 98.56 98.59 98.59 752 98.95 98.98 98.62 98.96 750 99.20 98.72 98.67 98.67 748 98.87 98.68 98.71 99.13 746 98.84 98.92 98.87 98.43 744 98.61 98.83 98.82 98.75 742 98.69 98.91 98.95 98.75 740 98.94 98.68 98.85 98.80 738 98.76 98.87 98.59 98.78 736 98.73 98.76 98.96 98.65 734 99.02 98.71 98.56 98.58 732 98.81 98.59 98.92 98.81 730 98.94 98.78 98.72 98.79 728 98.56 98.93 98.75 98.72 726 98.81 98.80 98.98 99.03 724 98.95 98.57 98.86 98.63 722 98.86 98.83 98.88 98.74 720 98.75 98.74 98.87 98.93 718 98.88 98.53 98.62 98.84 716 98.80 98.88 98.55 98.93 714 98.83 98.61 98.84 98.91 712 98.60 98.73 99.02 98.92 710 98.53 98.59 98.84 98.87 708 98.50 98.61 98.83 98.87 706 98.56 98.95 98.71 98.64 704 98.83 98.77 98.73 98.88 702 98.63 98.70 98.77 98.89 700 98.56 98.89 98.69 98.54 698 98.79 98.57 98.61 98.68 696 98.55 98.73 98.64 98.75 694 98.50 98.84 98.82 98.71 692 98.85 98.75 98.78 98.92 690 98.75 98.64 98.74 98.59 688 98.72 98.77 98.61 98.64 686 98.58 98.67 98.74 98.63 684 98.77 98.92 98.81 98.70 682 98.70 98.53 98.63 98.51 680 98.60 98.83 98.53 98.56 678 98.57 98.49 98.47 98.49 676 98.91 98.71 98.72 98.65 674 98.53 98.54 98.69 98.80 672 98.77 98.54 98.78 98.96 670 98.69 98.82 98.75 98.69 668 98.77 98.79 98.81 98.73 666 98.65 98.60 98.60 98.68 664 98.54 98.67 98.73 98.52 662 98.46 98.59 98.68 98.78 660 98.67 98.80 98.58 98.71 658 98.75 98.49 98.63 98.54 656 98.88 98.63 98.54 98.57 654 98.56 98.57 98.56 98.58 652 98.57 98.64 98.47 98.39 650 98.25 98.60 98.47 98.68 648 98.57 98.57 98.56 98.41 646 98.49 98.41 98.48 98.52 644 98.38 98.63 98.61 98.72 642 98.51 98.30 98.66 98.45 640 98.47 98.66 98.94 98.65 638 98.46 98.35 98.53 98.68 636 98.63 98.52 98.52 98.46 634 98.41 98.37 98.47 98.57 632 98.56 98.44 98.53 98.65 630 98.55 98.41 98.40 98.37 628 98.76 98.39 98.51 98.39 626 98.44 98.46 98.42 98.55 624 98.35 98.42 98.51 98.61 622 98.41 98.27 98.29 98.47 620 98.39 98.31 98.36 98.58 618 98.25 98.41 98.38 98.56 616 98.24 98.47 98.39 98.32 614 98.59 98.38 98.47 98.50 612 98.40 98.47 98.36 98.46 610 98.30 98.56 98.61 98.80 608 98.36 98.32 98.39 98.51 606 98.30 98.35 98.25 98.56 604 98.32 98.34 98.34 98.77 602 98.31 98.25 98.38 98.60 600 98.35 98.41 98.30 98.27 598 98.35 98.15 98.37 98.49 596 98.40 98.43 98.54 98.60 594 98.21 98.17 98.34 98.33 592 98.46 98.00 98.32 98.36 590 98.29 98.13 98.41 98.22 588 98.05 98.20 98.51 98.51 586 98.20 98.31 98.23 98.39 584 98.28 98.36 98.32 98.48 582 98.47 98.23 98.38 98.45 580 98.42 98.31 98.29 98.21 578 98.26 98.22 98.37 98.43 576 98.27 98.15 98.35 98.48 574 98.33 98.14 98.33 98.32 572 98.11 98.25 98.39 98.38 570 98.02 98.18 98.20 98.16 568 98.08 98.33 98.19 98.19 566 98.09 98.04 98.31 98.35 564 98.07 98.17 98.49 98.10 562 98.11 98.32 98.35 98.09 560 98.12 98.30 98.46 98.07 558 98.32 97.99 98.31 98.27 556 98.37 98.26 98.31 97.96 554 97.97 98.37 98.08 98.25 552 98.27 98.14 98.48 98.12 550 98.39 98.09 98.12 98.25 548 98.20 97.97 98.18 98.18 546 98.20 97.85 98.03 98.21 544 98.03 98.30 97.90 98.10 542 98.26 98.00 97.96 97.96 540 97.88 97.90 98.42 98.01 538 98.04 97.97 98.18 98.02 536 98.09 97.82 98.34 97.80 534 98.07 97.98 97.90 97.88 532 98.09 97.78 97.86 98.02 530 98.05 97.90 97.66 98.08 528 98.15 97.74 97.92 97.88 526 98.00 97.86 97.96 98.09 524 97.89 97.88 97.99 98.06 522 97.89 97.82 97.92 97.87 520 97.78 97.92 97.76 98.16 518 97.79 97.90 97.99 98.00 516 97.87 97.67 97.79 97.85 514 97.86 97.83 97.70 98.02 512 97.60 97.90 97.85 97.84 510 97.65 97.86 97.68 97.58 508 97.72 97.64 97.62 97.91 506 97.88 97.52 97.61 97.73 504 97.84 97.64 97.81 97.73 502 97.77 97.47 97.70 97.69 500 97.66 97.67 97.68 97.75 498 97.71 97.85 97.75 97.93 496 97.68 97.65 97.46 97.57 494 97.69 97.60 97.66 97.93 492 97.69 97.79 97.62 97.67 490 97.58 97.84 97.71 97.80 488 97.34 97.51 97.80 97.59 486 97.55 97.46 97.45 97.70 484 97.43 97.44 97.55 97.71 482 97.30 97.36 97.48 97.53 480 97.18 97.68 97.35 97.31 478 97.25 97.37 97.48 97.22 476 97.37 97.40 97.24 97.37 474 97.82 97.30 97.47 97.38 472 97.18 97.33 97.40 97.48 470 97.43 97.11 97.38 97.42 468 97.23 97.24 97.38 96.96 466 97.20 97.01 97.39 97.27 464 96.90 97.21 96.98 97.11 462 97.25 97.03 97.37 97.32 460 97.15 97.13 97.19 97.16 458 97.06 97.13 97.30 97.06 456 96.87 96.91 96.88 97.03 454 97.12 96.89 96.92 97.12 452 97.15 96.83 96.95 96.83 450 97.04 96.89 97.09 97.17 448 96.77 96.52 96.88 96.98 446 96.61 96.83 96.95 96.74 444 96.74 96.75 96.64 96.62 442 97.02 96.87 96.72 96.89 440 96.86 96.68 96.94 96.35 438 96.78 96.43 96.38 96.66 436 96.26 96.45 96.49 96.68 434 96.45 96.01 96.73 96.72 432 96.33 96.41 96.66 96.55 430 96.26 95.93 95.99 96.47 428 96.32 96.29 96.58 96.07 426 96.44 96.41 96.45 96.08 424 96.19 96.34 95.92 96.18 422 96.49 96.01 96.40 96.47 420 95.72 95.82 95.89 96.22 418 96.51 96.01 95.86 96.00 416 96.16 95.89 95.74 96.18 414 95.65 95.55 95.86 96.35 412 95.76 95.54 95.75 95.36 410 95.82 95.48 95.96 95.68 408 95.69 95.20 95.99 95.56 406 95.26 95.25 95.47 95.62 404 95.26 94.97 95.26 95.21 402 94.50 95.62 95.13 94.68 400 95.17 95.69 94.90 94.75 398 94.65 95.02 95.69 95.40 396 94.70 95.32 94.72 94.54 394 95.05 94.33 94.49 94.31 392 94.34 93.90 94.42 93.95 390 93.51 94.54 94.30 94.95 388 94.06 93.44 94.86 94.80 386 93.97 93.62 93.91 93.54 384 94.06 93.50 93.74 93.18 382 93.63 93.65 93.50 94.04 380 93.23 92.40 92.64 93.63 1650 99.12 99.17 99.20 99.22 1640 99.13 99.17 99.19 99.19 1630 99.12 99.16 99.20 99.20 1620 99.13 99.17 99.19 99.18 1610 99.13 99.16 99.19 99.19 1600 99.13 99.18 99.19 99.20 1590 99.13 99.17 99.19 99.19 1580 99.12 99.16 99.19 99.19 1570 99.12 99.16 99.19 99.19 1560 99.12 99.16 99.20 99.19 1550 99.12 99.17 99.19 99.19 1540 99.12 99.17 99.19 99.19 1530 99.12 99.16 99.18 99.19 1520 99.12 99.17 99.19 99.19 1510 99.13 99.17 99.18 99.19 1500 99.12 99.16 99.19 99.20 1490 99.13 99.16 99.19 99.19 1480 99.13 99.16 99.19 99.20 1470 99.12 99.16 99.18 99.19 1460 99.12 99.17 99.18 99.20 1450 99.12 99.16 99.19 99.19 1440 99.12 99.17 99.18 99.18 1430 99.12 99.17 99.19 99.19 1420 99.12 99.16 99.19 99.18 1410 99.11 99.17 99.18 99.19 1400 99.12 99.16 99.18 99.19 1390 99.12 99.17 99.18 99.18 1380 99.12 99.16 99.17 99.18 1370 99.11 99.16 99.17 99.18 1360 99.11 99.16 99.17 99.18 1350 99.11 99.15 99.17 99.18 1340 99.11 99.15 99.17 99.17 1330 99.11 99.14 99.17 99.17 1320 99.10 99.14 99.17 99.17 1310 99.11 99.15 99.16 99.17 1300 99.09 99.14 99.17 99.17 1290 99.11 99.14 99.16 99.17 1280 99.11 99.14 99.16 99.16 1270 99.10 99.14 99.16 99.16 1260 99.11 99.14 99.15 99.16 1250 99.10 99.15 99.16 99.16 1240 99.09 99.13 99.15 99.16 1230 99.10 99.13 99.15 99.16 1220 99.10 99.14 99.15 99.16 1210 99.09 99.13 99.15 99.14 1200 99.09 99.13 99.14 99.16 1190 99.09 99.13 99.14 99.14 1180 99.08 99.13 99.14 99.14 1170 99.08 99.13 99.13 99.13 1160 99.09 99.13 99.14 99.14 1150 99.08 99.13 99.13 99.13 1140 99.07 99.12 99.13 99.13 1130 99.08 99.13 99.13 99.13 1120 99.08 99.12 99.13 99.13 1110 99.07 99.11 99.12 99.12 1100 99.08 99.12 99.12 99.12 1090 99.08 99.11 99.11 99.12 1080 99.07 99.11 99.11 99.12 1070 99.07 99.11 99.11 99.10 1060 99.06 99.11 99.11 99.11 1050 99.06 99.10 99.11 99.11 1040 99.07 99.11 99.10 99.10 1030 99.06 99.10 99.10 99.10 1020 99.05 99.10 99.09 99.09 1010 99.05 99.10 99.09 99.11 1000 99.05 99.11 99.08 99.08 990 99.05 99.10 99.08 99.09 980 99.04 99.10 99.09 99.08 970 99.04 99.09 99.07 99.07 960 99.04 99.09 99.08 99.08 950 99.03 99.08 99.08 99.07