# 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 2023-04-12 (1252 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 98.88 100.21 99.53 998 98.51 98.94 99.32 996 99.00 99.45 99.00 994 99.24 99.94 99.53 992 97.82 97.83 99.01 990 98.86 99.22 98.77 988 99.57 99.21 99.27 986 99.19 99.44 99.33 984 99.01 99.82 99.33 982 99.25 99.76 100.19 980 99.45 99.21 99.27 978 98.57 98.70 99.18 976 99.54 100.07 99.47 974 98.78 99.50 99.11 972 98.71 99.84 98.68 970 99.69 100.09 100.28 968 98.83 98.21 99.77 966 98.50 99.25 99.28 964 99.19 100.36 99.90 962 99.27 98.10 99.21 960 99.77 98.36 99.29 958 99.43 99.20 99.32 956 99.32 98.67 99.00 954 99.55 99.26 98.93 952 99.71 99.72 98.72 950 99.86 98.93 99.18 948 99.33 99.69 99.74 946 99.01 99.32 98.53 944 99.31 99.38 98.69 942 98.79 99.04 98.93 940 98.50 99.17 98.79 938 98.54 98.49 99.59 936 99.07 99.05 99.07 934 99.23 99.28 99.42 932 98.91 98.77 98.65 930 99.36 99.13 99.42 928 98.96 99.12 98.73 926 99.02 99.30 98.65 924 99.24 99.30 98.63 922 99.01 99.27 99.10 920 99.13 99.75 98.82 918 99.64 98.99 99.06 916 99.02 99.27 99.06 914 98.78 99.17 99.42 912 99.24 98.92 99.09 910 98.88 98.90 99.12 908 99.50 99.32 99.05 906 98.52 98.87 99.03 904 98.58 99.22 98.93 902 99.17 99.50 99.00 900 99.01 99.35 99.05 898 98.97 99.25 99.03 896 99.08 98.90 98.53 894 98.87 99.17 99.07 892 98.84 99.13 98.83 890 98.78 99.29 99.43 888 99.05 99.42 98.98 886 98.55 98.64 99.39 884 98.77 99.17 99.16 882 99.17 98.82 99.10 880 98.99 99.33 99.16 878 99.03 99.05 98.87 876 98.65 98.81 99.07 874 98.94 99.27 99.03 872 99.17 99.21 98.84 870 98.94 98.95 98.88 868 99.23 98.82 99.09 866 98.95 99.19 98.99 864 98.87 98.81 99.06 862 99.10 99.61 99.19 860 99.24 99.37 98.89 858 98.96 99.18 98.90 856 99.07 98.97 98.97 854 98.80 99.12 99.17 852 99.08 98.62 98.76 850 98.89 99.25 99.51 848 99.13 98.99 99.38 846 99.20 99.14 98.49 844 99.18 98.93 99.08 842 98.90 99.15 99.04 840 98.76 98.75 98.68 838 98.82 99.36 98.91 836 98.88 98.74 99.31 834 98.68 98.74 98.58 832 98.51 98.82 99.43 830 98.94 99.20 99.07 828 99.05 99.52 98.67 826 98.97 98.94 98.93 824 98.91 98.85 98.41 822 98.88 99.49 98.98 820 98.80 98.77 98.79 818 98.82 98.57 98.67 816 98.83 98.84 98.79 814 99.23 98.75 99.03 812 98.92 98.64 99.06 810 98.34 98.66 99.21 808 98.80 98.43 99.03 806 98.83 98.89 98.78 804 98.71 98.81 98.73 802 98.55 99.20 98.83 800 98.38 98.75 98.61 798 98.60 98.96 98.74 796 98.74 98.88 99.12 794 98.99 98.49 98.69 792 98.47 98.39 98.90 790 98.56 98.41 98.93 788 98.69 98.54 98.77 786 98.64 99.12 98.71 784 98.30 98.75 99.05 782 98.88 99.04 98.80 780 98.39 98.95 98.41 778 98.28 98.76 98.43 776 98.34 98.61 98.88 774 98.85 98.61 98.80 772 98.80 98.46 98.81 770 98.38 98.41 98.65 768 98.57 98.87 98.36 766 98.42 98.87 98.67 764 98.34 98.49 98.58 762 98.63 98.51 98.89 760 98.57 98.67 98.61 758 98.62 98.53 98.91 756 98.27 98.30 98.72 754 98.52 98.72 98.67 752 98.67 98.73 98.43 750 98.53 98.34 98.72 748 98.17 98.43 98.68 746 98.42 98.68 98.65 744 98.61 98.53 98.62 742 98.39 98.74 98.62 740 98.52 98.55 98.55 738 98.43 98.64 98.21 736 98.44 98.42 98.18 734 98.39 98.44 98.34 732 98.48 98.40 98.35 730 98.41 98.38 98.60 728 98.41 98.50 98.35 726 98.41 98.62 98.31 724 98.50 98.64 98.19 722 98.23 98.51 98.29 720 98.27 98.44 98.19 718 98.34 98.59 98.34 716 98.01 98.56 98.46 714 98.11 98.35 98.50 712 98.26 98.19 98.59 710 98.10 98.37 98.35 708 98.14 98.24 98.29 706 98.06 98.48 98.36 704 98.13 98.17 98.37 702 98.01 98.24 98.32 700 98.12 98.25 98.24 698 98.15 98.36 98.19 696 97.98 98.22 98.40 694 98.29 98.14 98.22 692 97.97 98.03 98.17 690 98.34 98.39 98.32 688 98.17 98.25 98.35 686 97.97 98.37 98.27 684 98.19 98.31 98.27 682 98.18 98.27 97.95 680 97.85 98.05 98.39 678 98.01 98.02 98.12 676 97.97 98.10 98.19 674 97.87 98.01 98.03 672 97.83 98.30 98.04 670 97.93 98.16 98.05 668 97.78 98.14 98.15 666 97.76 97.94 97.86 664 97.84 97.83 98.17 662 97.76 97.99 97.99 660 97.76 97.85 97.99 658 97.71 97.88 97.90 656 98.09 98.02 98.09 654 97.83 97.94 97.93 652 97.76 97.94 97.83 650 97.61 97.89 97.84 648 97.70 97.72 97.81 646 97.56 97.59 97.58 644 97.54 97.58 97.74 642 97.66 97.69 97.68 640 97.72 97.90 97.57 638 97.54 97.91 97.78 636 97.60 97.58 97.68 634 97.57 97.94 97.74 632 97.46 97.51 97.81 630 97.75 97.60 97.44 628 97.51 97.74 97.65 626 97.43 97.78 97.66 624 97.66 97.75 97.44 622 97.52 97.73 97.63 620 97.30 97.64 97.66 618 97.51 97.45 97.48 616 97.49 97.60 97.48 614 97.28 97.52 97.53 612 97.29 97.41 97.47 610 97.22 97.57 97.36 608 97.13 97.42 97.45 606 97.41 97.43 97.53 604 97.25 97.57 97.24 602 97.24 97.35 97.25 600 97.28 97.08 97.46 598 97.09 97.25 97.23 596 97.04 97.13 97.63 594 97.04 97.32 97.31 592 96.99 97.23 97.44 590 97.21 97.15 97.17 588 96.87 97.40 97.14 586 96.73 97.13 97.24 584 96.98 97.23 97.26 582 96.97 97.29 97.14 580 96.79 97.13 97.17 578 96.74 97.16 97.37 576 96.92 96.96 97.17 574 96.84 97.17 96.95 572 96.95 96.85 97.07 570 96.72 97.12 97.00 568 96.58 97.03 97.03 566 96.68 96.94 96.93 564 96.74 96.69 96.93 562 96.48 96.69 96.63 560 96.42 96.76 96.74 558 96.50 96.84 96.82 556 96.66 96.77 96.60 554 96.51 96.54 96.58 552 96.46 96.50 96.75 550 96.33 96.63 96.71 548 96.06 96.71 96.26 546 96.23 96.49 96.55 544 96.28 96.43 96.33 542 95.95 96.13 96.28 540 96.06 96.35 96.22 538 96.07 96.52 96.40 536 95.75 96.28 96.19 534 95.91 96.22 96.10 532 96.08 96.15 96.14 530 95.58 95.90 95.80 528 95.70 95.83 96.01 526 95.79 96.06 95.77 524 95.36 95.87 96.02 522 95.50 95.41 95.82 520 95.12 95.68 95.55 518 95.19 95.65 95.62 516 95.27 95.46 95.36 514 94.96 95.56 95.63 512 94.95 95.51 95.20 510 94.82 95.30 95.42 508 94.74 95.22 95.41 506 94.84 95.10 95.05 504 94.75 95.12 95.04 502 94.61 95.14 94.98 500 94.46 95.06 94.96 498 94.41 94.81 94.68 496 94.44 94.56 94.71 494 94.13 94.62 94.91 492 93.95 94.57 94.48 490 93.80 94.28 94.51 488 93.78 94.17 94.11 486 93.64 94.07 93.84 484 93.41 93.93 93.93 482 93.27 93.79 93.88 480 93.25 93.70 93.41 478 93.06 93.12 93.34 476 92.62 93.48 93.14 474 92.57 93.31 93.25 472 92.41 93.23 92.98 470 92.25 92.74 92.82 468 92.09 92.39 92.58 466 91.87 92.58 92.42 464 91.85 91.99 92.00 462 91.54 91.77 92.01 460 91.17 91.64 91.50 458 90.96 91.42 91.49 456 90.80 91.39 90.84 454 90.20 90.76 90.72 452 90.36 91.09 90.36 450 90.09 90.78 90.03 448 89.63 90.56 89.91 446 89.92 89.99 89.63 444 89.28 90.09 90.05 442 89.10 89.49 89.47 440 88.86 89.40 89.09 438 88.64 89.11 89.16 436 88.40 88.68 88.34 434 88.42 88.05 87.90 432 87.89 88.18 88.29 430 87.46 87.39 87.72 428 87.24 87.53 87.60 426 86.75 87.22 87.13 424 86.34 87.24 86.63 422 86.54 86.75 86.55 420 85.59 86.17 86.23 418 85.70 86.00 86.31 416 85.42 85.99 85.64 414 85.30 85.33 84.78 412 84.25 85.09 85.14 410 83.51 84.37 84.43 408 83.99 84.64 84.04 406 83.38 84.16 83.29 404 83.00 83.09 82.87 402 82.52 82.89 82.81 400 81.87 82.25 82.06 398 81.85 81.98 81.36 396 83.29 82.54 81.55 394 80.72 80.83 80.93 392 80.27 80.68 79.82 390 79.85 79.65 80.38 388 78.80 79.47 78.87 386 78.27 79.37 78.30 384 77.74 77.80 77.61 382 77.01 78.03 77.52 380 76.60 77.18 77.04 1650 99.23 99.34 99.28 1640 99.24 99.33 99.29 1630 99.23 99.34 99.28 1620 99.24 99.33 99.29 1610 99.22 99.33 99.28 1600 99.23 99.32 99.29 1590 99.24 99.32 99.28 1580 99.22 99.33 99.28 1570 99.23 99.31 99.27 1560 99.21 99.32 99.28 1550 99.22 99.30 99.26 1540 99.22 99.32 99.28 1530 99.23 99.31 99.27 1520 99.22 99.31 99.26 1510 99.23 99.30 99.26 1500 99.21 99.30 99.27 1490 99.21 99.30 99.26 1480 99.21 99.30 99.25 1470 99.22 99.30 99.26 1460 99.20 99.30 99.25 1450 99.21 99.29 99.25 1440 99.19 99.28 99.24 1430 99.20 99.29 99.25 1420 99.19 99.29 99.25 1410 99.19 99.29 99.24 1400 99.19 99.28 99.24 1390 99.19 99.28 99.24 1380 99.19 99.28 99.24 1370 99.17 99.27 99.23 1360 99.18 99.28 99.23 1350 99.18 99.27 99.24 1340 99.17 99.27 99.24 1330 99.18 99.27 99.23 1320 99.17 99.28 99.23 1310 99.17 99.27 99.22 1300 99.17 99.27 99.24 1290 99.15 99.27 99.23 1280 99.17 99.26 99.22 1270 99.16 99.26 99.23 1260 99.15 99.26 99.22 1250 99.16 99.25 99.22 1240 99.14 99.26 99.22 1230 99.14 99.26 99.20 1220 99.14 99.26 99.20 1210 99.14 99.24 99.20 1200 99.13 99.24 99.20 1190 99.12 99.24 99.20 1180 99.13 99.23 99.19 1170 99.12 99.24 99.19 1160 99.10 99.23 99.18 1150 99.11 99.23 99.18 1140 99.10 99.23 99.18 1130 99.09 99.22 99.18 1120 99.08 99.21 99.16 1110 99.09 99.20 99.16 1100 99.07 99.21 99.16 1090 99.07 99.21 99.15 1080 99.07 99.21 99.14 1070 99.07 99.20 99.15 1060 99.06 99.20 99.14 1050 99.05 99.20 99.12 1040 99.04 99.18 99.12 1030 99.03 99.16 99.12 1020 99.04 99.18 99.12 1010 99.01 99.17 99.11 1000 99.01 99.16 99.09 990 98.99 99.15 99.09 980 99.00 99.14 99.09 970 98.99 99.16 99.08 960 98.98 99.13 99.07 950 98.95 99.13 99.05