# 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 2021-01-11 (431 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 99.35 99.26 99.96 998 99.41 99.73 100.55 996 99.19 98.46 99.54 994 99.27 98.33 98.93 992 99.08 98.96 99.33 990 99.68 98.52 98.56 988 99.66 98.71 99.59 986 98.65 99.21 99.72 984 99.45 98.75 99.71 982 100.26 98.70 99.16 980 98.59 99.23 99.75 978 100.04 99.37 99.27 976 99.64 99.62 100.26 974 99.51 99.10 99.44 972 99.14 98.74 99.70 970 99.69 99.66 99.28 968 98.69 99.28 99.78 966 99.10 98.69 99.24 964 99.01 99.45 99.82 962 99.25 99.36 99.37 960 98.85 99.46 99.57 958 99.90 99.70 99.84 956 99.76 99.51 99.33 954 99.23 99.08 99.57 952 99.40 99.73 99.81 950 100.10 99.99 99.08 948 99.37 99.40 99.84 946 99.42 98.92 99.96 944 99.78 99.57 99.55 942 99.98 99.43 100.20 940 99.62 98.99 99.70 938 99.63 99.33 99.78 936 99.08 99.30 99.60 934 99.62 99.12 99.93 932 99.49 98.82 99.22 930 99.62 99.34 99.43 928 99.84 99.06 99.76 926 99.44 99.55 99.66 924 99.81 99.30 99.44 922 98.83 99.36 99.70 920 99.45 99.40 99.26 918 99.11 98.59 99.42 916 99.02 99.64 99.50 914 98.89 99.47 99.60 912 99.50 99.33 99.84 910 99.75 99.46 99.95 908 99.73 99.21 99.65 906 99.23 99.36 99.39 904 99.50 99.42 99.28 902 99.60 99.55 99.83 900 99.52 99.47 100.06 898 99.48 99.29 99.52 896 99.73 99.23 99.52 894 99.71 98.91 99.35 892 99.54 99.11 99.69 890 98.99 98.93 99.68 888 98.99 99.21 99.82 886 99.29 99.33 99.30 884 99.25 99.22 99.38 882 99.53 99.63 99.43 880 99.33 99.31 99.55 878 99.36 99.20 99.53 876 99.38 99.25 99.32 874 99.42 99.15 99.68 872 99.30 99.29 99.31 870 99.67 99.40 99.47 868 99.25 99.16 99.32 866 98.94 99.38 99.50 864 99.50 99.30 99.40 862 99.56 99.32 99.53 860 99.65 99.09 99.45 858 99.23 99.40 99.52 856 99.73 99.25 99.47 854 99.54 99.47 99.42 852 99.27 99.42 99.67 850 99.18 99.51 99.33 848 99.04 99.15 99.33 846 99.19 99.37 99.32 844 99.32 99.23 99.30 842 99.38 99.41 99.28 840 99.28 99.68 99.63 838 99.70 99.34 99.42 836 99.29 99.27 99.41 834 99.05 99.61 99.28 832 98.79 99.32 99.72 830 99.16 99.31 99.18 828 99.56 99.13 98.99 826 99.40 99.26 99.46 824 99.41 98.82 98.90 822 99.38 99.42 99.35 820 99.27 99.08 99.36 818 99.35 98.87 99.17 816 99.50 99.03 99.25 814 99.64 99.45 99.52 812 99.26 99.24 99.48 810 99.30 99.35 99.37 808 99.13 99.33 99.21 806 99.23 99.34 99.34 804 99.20 98.77 99.34 802 99.59 99.35 99.23 800 99.70 99.33 99.29 798 99.40 99.24 99.21 796 99.25 99.11 99.48 794 99.02 99.40 99.19 792 99.16 98.94 99.11 790 99.22 98.97 98.97 788 98.93 98.96 99.13 786 99.39 98.74 99.13 784 99.54 98.92 99.34 782 99.21 99.36 99.32 780 99.30 98.98 99.05 778 99.14 99.01 99.14 776 99.17 98.96 98.95 774 99.08 99.08 99.06 772 99.19 99.19 99.38 770 98.99 99.13 99.39 768 99.31 99.14 98.91 766 99.26 98.93 99.06 764 99.38 99.11 99.09 762 99.05 99.24 99.00 760 99.11 98.99 99.39 758 98.94 99.30 99.28 756 98.90 98.80 99.16 754 99.06 98.77 99.28 752 99.00 98.94 99.20 750 99.08 99.12 99.01 748 99.00 98.79 99.05 746 99.18 99.10 98.82 744 99.08 98.99 99.02 742 98.80 98.84 98.96 740 99.26 99.00 99.00 738 99.13 99.11 99.06 736 98.78 98.95 99.14 734 98.82 99.02 98.93 732 99.15 99.05 98.99 730 99.06 99.00 98.98 728 99.13 99.09 98.62 726 98.93 99.13 99.05 724 98.98 98.90 98.98 722 99.16 98.83 99.15 720 98.99 99.04 99.22 718 99.06 98.89 98.92 716 98.94 98.87 98.79 714 98.88 98.92 98.99 712 98.99 98.71 98.97 710 98.89 98.71 99.19 708 98.80 98.82 99.08 706 98.80 98.74 98.75 704 98.96 98.81 98.87 702 98.46 98.57 98.86 700 98.82 98.86 98.99 698 99.09 99.00 99.05 696 98.96 98.82 98.89 694 98.88 98.75 98.85 692 98.79 98.82 98.99 690 98.63 98.71 99.01 688 98.75 98.82 98.97 686 98.55 98.78 98.96 684 98.48 98.77 99.07 682 98.74 98.73 98.86 680 98.97 98.73 98.78 678 98.75 98.66 98.74 676 98.62 98.68 98.58 674 98.64 98.75 98.74 672 98.63 98.82 98.63 670 98.51 98.72 98.79 668 98.74 98.54 98.50 666 98.52 98.47 98.69 664 98.57 98.48 98.60 662 98.49 98.46 98.57 660 98.64 98.61 98.70 658 98.72 98.58 98.66 656 98.40 98.64 98.69 654 98.90 98.55 98.46 652 98.65 98.65 98.40 650 98.50 98.46 98.61 648 98.38 98.55 98.34 646 98.40 98.48 98.55 644 98.69 98.27 98.55 642 98.31 98.54 98.43 640 98.44 98.63 98.43 638 98.43 98.49 98.49 636 98.33 98.33 98.50 634 98.45 98.33 98.38 632 98.18 98.24 98.48 630 98.21 98.44 98.14 628 98.28 98.47 98.39 626 98.34 98.36 98.56 624 98.48 98.31 98.36 622 98.27 98.48 98.32 620 98.28 98.35 98.35 618 98.22 98.26 98.35 616 98.24 98.39 98.32 614 98.28 98.27 98.22 612 98.22 98.35 98.32 610 98.23 98.27 98.28 608 98.22 98.35 98.21 606 98.14 98.19 98.20 604 98.36 98.07 98.26 602 98.28 98.23 98.20 600 98.15 98.15 98.22 598 98.05 98.05 98.34 596 98.27 97.91 98.35 594 98.14 98.00 97.96 592 97.86 98.06 98.17 590 98.12 98.13 98.05 588 98.02 98.15 98.22 586 97.80 98.20 98.28 584 97.80 97.97 98.00 582 97.94 97.72 98.20 580 98.13 97.96 98.09 578 98.10 98.05 97.92 576 97.90 97.97 97.85 574 97.79 98.05 97.94 572 97.92 97.73 97.96 570 97.81 97.93 98.03 568 97.80 97.56 97.84 566 97.64 97.79 97.76 564 97.90 98.08 97.76 562 97.52 97.65 97.92 560 97.65 97.56 97.67 558 97.63 97.66 97.74 556 97.63 97.74 97.74 554 97.57 97.72 97.66 552 97.54 97.82 97.67 550 97.63 97.60 97.80 548 97.59 97.51 97.88 546 97.53 97.59 97.62 544 97.52 97.73 97.49 542 97.58 97.46 97.55 540 97.56 97.37 97.54 538 97.39 97.36 97.68 536 97.39 97.25 97.59 534 97.32 97.42 97.61 532 97.12 97.22 97.29 530 97.31 97.43 97.64 528 97.20 97.13 97.41 526 97.15 97.29 97.52 524 97.31 97.20 97.12 522 97.19 97.10 97.49 520 97.04 97.34 97.22 518 97.20 96.95 96.98 516 97.04 96.90 96.67 514 96.87 96.67 96.97 512 96.78 96.91 96.92 510 96.88 96.83 97.07 508 96.94 96.76 97.10 506 96.84 96.87 96.72 504 96.54 96.67 96.55 502 96.43 96.42 96.56 500 96.18 96.93 96.31 498 96.37 96.50 96.45 496 96.49 96.32 96.33 494 96.48 96.36 96.35 492 96.09 96.21 96.22 490 96.31 96.16 96.31 488 96.02 95.97 96.04 486 96.24 96.20 96.31 484 96.34 95.90 95.71 482 96.03 96.09 96.09 480 95.75 95.84 95.71 478 95.54 95.59 95.81 476 95.31 95.45 95.48 474 95.54 95.05 95.62 472 95.51 95.21 95.35 470 95.26 95.10 95.35 468 95.17 95.19 95.15 466 94.81 95.03 95.09 464 94.98 94.87 94.71 462 94.69 94.72 94.76 460 94.56 94.48 94.46 458 94.84 94.43 94.34 456 94.36 94.00 94.35 454 94.05 93.55 93.96 452 93.83 93.71 93.81 450 93.86 93.94 93.56 448 93.66 93.54 93.71 446 93.23 93.53 93.17 444 93.32 93.22 93.66 442 93.15 92.97 92.92 440 92.77 92.25 93.28 438 92.76 92.63 93.28 436 92.56 92.29 92.66 434 92.51 92.36 92.02 432 92.33 91.99 91.95 430 92.10 91.97 92.04 428 91.90 91.87 91.93 426 91.67 91.58 91.36 424 90.97 90.90 90.96 422 91.24 91.28 91.30 420 91.13 91.19 91.45 418 91.01 90.43 90.87 416 90.91 90.46 90.76 414 90.17 90.52 90.56 412 90.43 90.26 90.23 410 89.91 89.62 89.58 408 89.79 89.66 90.01 406 89.44 88.96 89.26 404 89.55 89.14 89.55 402 89.00 89.17 88.77 400 88.55 89.00 88.89 398 88.69 88.38 88.43 396 88.22 87.79 88.06 394 87.81 87.38 88.03 392 87.15 86.92 87.83 390 86.64 87.29 86.84 388 86.54 87.24 87.61 386 85.77 86.56 86.19 384 84.97 86.05 85.95 382 85.35 85.29 85.47 380 84.16 84.90 84.77 1650 99.45 99.47 99.45 1640 99.46 99.48 99.45 1630 99.46 99.47 99.45 1620 99.46 99.46 99.46 1610 99.46 99.48 99.46 1600 99.46 99.47 99.46 1590 99.46 99.47 99.46 1580 99.47 99.46 99.46 1570 99.47 99.48 99.45 1560 99.47 99.47 99.46 1550 99.47 99.46 99.46 1540 99.48 99.47 99.46 1530 99.47 99.47 99.46 1520 99.48 99.47 99.47 1510 99.48 99.48 99.46 1500 99.49 99.48 99.47 1490 99.48 99.48 99.47 1480 99.48 99.49 99.47 1470 99.49 99.48 99.46 1460 99.49 99.49 99.47 1450 99.48 99.49 99.47 1440 99.49 99.48 99.47 1430 99.48 99.48 99.48 1420 99.49 99.49 99.48 1410 99.49 99.49 99.48 1400 99.49 99.49 99.48 1390 99.49 99.49 99.48 1380 99.49 99.49 99.49 1370 99.49 99.48 99.48 1360 99.50 99.49 99.48 1350 99.49 99.49 99.49 1340 99.49 99.49 99.49 1330 99.49 99.50 99.49 1320 99.49 99.50 99.49 1310 99.50 99.49 99.49 1300 99.50 99.51 99.49 1290 99.50 99.49 99.49 1280 99.50 99.50 99.49 1270 99.50 99.51 99.49 1260 99.50 99.50 99.48 1250 99.51 99.50 99.49 1240 99.50 99.50 99.50 1230 99.49 99.50 99.50 1220 99.50 99.50 99.49 1210 99.50 99.50 99.50 1200 99.49 99.50 99.49 1190 99.50 99.50 99.49 1180 99.50 99.49 99.48 1170 99.50 99.50 99.49 1160 99.49 99.49 99.50 1150 99.49 99.48 99.48 1140 99.49 99.49 99.49 1130 99.50 99.49 99.49 1120 99.49 99.49 99.49 1110 99.49 99.50 99.48 1100 99.49 99.48 99.48 1090 99.49 99.49 99.48 1080 99.47 99.50 99.48 1070 99.48 99.50 99.48 1060 99.49 99.48 99.47 1050 99.49 99.48 99.48 1040 99.48 99.49 99.47 1030 99.49 99.48 99.48 1020 99.48 99.48 99.47 1010 99.49 99.48 99.46 1000 99.48 99.47 99.46 990 99.48 99.47 99.47 980 99.49 99.47 99.46 970 99.48 99.45 99.45 960 99.49 99.45 99.45 950 99.48 99.44 99.45