# Subaru Telescope Infrared Tertiary Mirror In-Situ Measured Reflectivity # Coated with Silver on 2014-04-16 # Opened the vacuum chamber:2024-04-17 # Measured with Subaru Portable Spectrophotometer (SPS) on 2026-05-22 (36 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 98.77 99.20 98.64 998 99.38 99.05 97.87 996 99.05 99.03 99.26 994 99.45 98.21 97.38 992 98.60 99.71 98.50 990 99.37 99.74 99.11 988 98.57 98.74 98.99 986 99.20 98.64 99.02 984 98.60 99.19 99.04 982 99.79 99.60 98.89 980 99.02 99.66 98.91 978 99.64 99.53 98.74 976 98.61 98.09 99.08 974 98.91 98.51 99.50 972 99.44 98.72 98.90 970 98.79 99.15 98.77 968 99.14 98.82 98.41 966 99.14 99.05 99.14 964 99.05 99.21 98.86 962 98.19 98.51 98.36 960 98.77 98.88 98.86 958 98.89 98.59 98.27 956 99.60 98.71 98.71 954 99.34 98.75 98.84 952 99.52 99.48 98.12 950 99.79 98.62 98.76 948 99.16 98.83 98.66 946 98.51 99.38 99.11 944 98.53 99.15 99.37 942 98.88 98.64 98.95 940 98.81 98.70 99.43 938 98.68 98.59 98.75 936 98.68 98.82 98.43 934 99.62 99.06 99.25 932 98.38 98.87 98.76 930 99.01 99.00 98.46 928 98.86 99.24 99.18 926 98.88 99.32 98.77 924 99.25 99.26 98.65 922 99.30 98.32 98.90 920 98.49 98.67 98.37 918 99.26 98.97 98.84 916 99.01 98.89 98.88 914 98.82 98.67 99.72 912 98.71 99.15 98.52 910 99.31 98.83 98.67 908 98.37 98.99 98.49 906 98.72 99.49 98.48 904 99.16 98.69 98.94 902 98.96 98.69 98.74 900 98.93 98.94 98.66 898 98.98 98.67 98.82 896 98.62 98.95 98.71 894 98.94 99.03 98.86 892 98.96 98.89 98.68 890 99.06 98.87 98.70 888 98.31 98.58 98.75 886 98.70 98.98 98.48 884 98.88 99.21 98.75 882 98.95 98.96 98.40 880 98.70 98.81 98.70 878 99.44 98.92 99.06 876 99.07 98.76 98.61 874 98.74 98.99 98.54 872 98.77 99.10 98.87 870 98.98 99.27 98.97 868 98.90 99.37 98.68 866 98.76 98.84 99.15 864 98.91 98.97 98.93 862 98.84 98.46 98.80 860 99.10 98.67 98.94 858 98.96 98.43 98.96 856 98.82 98.26 98.65 854 98.85 98.85 98.45 852 99.04 98.80 98.58 850 99.07 98.59 98.12 848 98.66 98.85 98.31 846 99.19 98.78 98.76 844 98.74 98.97 98.98 842 99.20 98.37 98.47 840 98.70 98.79 99.10 838 99.01 99.27 98.70 836 99.29 99.20 99.10 834 98.66 98.91 98.66 832 98.77 98.63 98.67 830 99.41 98.80 98.73 828 99.10 98.78 98.77 826 99.19 98.59 98.90 824 99.20 98.84 98.87 822 99.20 99.07 98.61 820 98.51 99.01 98.53 818 98.87 98.93 98.35 816 98.84 98.38 98.47 814 99.28 99.03 98.37 812 98.42 99.01 98.69 810 98.53 98.82 98.28 808 98.60 99.12 98.57 806 98.70 98.75 98.37 804 98.80 98.67 98.66 802 98.97 98.67 98.70 800 99.10 98.72 98.92 798 99.06 99.07 98.61 796 98.91 98.90 98.41 794 98.82 99.08 98.32 792 98.93 98.51 98.63 790 98.99 98.86 98.19 788 98.46 98.66 98.82 786 98.99 98.76 98.76 784 99.07 98.45 98.27 782 99.31 98.84 98.27 780 98.85 98.61 98.57 778 98.69 98.87 98.36 776 98.58 98.81 98.81 774 98.37 98.71 98.41 772 98.74 98.84 98.66 770 98.79 98.94 98.45 768 98.31 98.70 98.83 766 98.75 98.74 98.63 764 98.84 98.64 98.60 762 98.49 98.68 98.52 760 98.78 98.60 98.64 758 99.04 98.41 98.65 756 98.83 98.50 98.64 754 98.57 98.78 98.59 752 98.89 98.59 98.64 750 98.69 98.53 98.47 748 98.43 98.67 98.77 746 98.64 98.91 98.54 744 98.52 98.69 98.65 742 98.69 98.66 98.45 740 98.98 98.55 98.37 738 98.58 98.65 98.61 736 98.59 98.26 98.34 734 98.50 98.22 98.45 732 98.39 98.61 98.34 730 98.35 98.65 98.27 728 98.46 98.49 98.42 726 98.74 98.34 98.42 724 98.41 98.41 98.41 722 98.65 98.47 98.42 720 98.51 98.80 98.57 718 98.56 98.38 98.54 716 98.52 98.51 98.46 714 98.69 98.59 98.36 712 98.69 98.42 98.59 710 98.57 98.54 98.56 708 98.65 98.50 98.87 706 98.44 98.45 98.36 704 98.63 98.53 98.39 702 98.58 98.52 98.23 700 98.58 98.41 98.68 698 98.34 98.62 98.24 696 98.54 98.63 98.40 694 98.49 98.39 98.26 692 98.49 98.50 98.36 690 98.53 98.77 98.21 688 98.39 98.40 98.49 686 98.46 98.52 98.36 684 98.37 98.38 98.20 682 98.45 98.57 98.23 680 98.33 98.41 98.40 678 98.40 98.66 98.17 676 98.58 98.41 98.34 674 98.26 98.39 98.28 672 98.24 98.51 98.29 670 98.36 98.32 98.37 668 98.25 98.45 98.38 666 98.20 98.67 98.26 664 98.29 98.11 98.21 662 98.41 98.24 98.19 660 98.46 98.16 98.17 658 98.33 98.45 98.08 656 98.37 98.39 98.15 654 98.47 98.25 98.11 652 98.28 98.38 98.16 650 98.02 98.16 98.19 648 98.03 98.11 98.15 646 97.96 98.02 98.06 644 97.97 98.15 98.17 642 98.09 98.10 98.14 640 97.78 98.14 98.12 638 98.23 98.14 98.11 636 98.38 98.23 98.21 634 98.18 98.07 97.94 632 98.16 98.23 98.00 630 98.21 98.15 98.01 628 98.23 98.13 98.11 626 98.33 98.07 97.94 624 98.20 97.89 97.84 622 98.10 98.04 98.15 620 97.97 98.03 98.11 618 97.98 97.96 97.92 616 98.18 97.83 97.89 614 97.74 97.98 97.78 612 97.76 98.10 97.87 610 98.00 98.05 97.80 608 98.04 98.03 97.93 606 98.02 98.12 97.83 604 97.89 97.90 97.87 602 98.03 97.86 97.89 600 97.96 98.07 97.59 598 97.90 97.99 97.85 596 97.85 97.89 97.83 594 98.12 97.79 97.77 592 97.93 97.65 97.85 590 97.93 97.87 97.92 588 97.80 98.00 97.76 586 97.99 97.96 97.59 584 97.95 97.94 97.65 582 97.80 97.79 97.70 580 97.58 97.91 97.76 578 97.80 97.84 97.70 576 97.88 97.42 97.62 574 97.79 97.80 97.61 572 97.91 97.55 97.51 570 97.62 97.91 97.65 568 97.56 97.56 97.45 566 97.67 97.66 97.53 564 97.41 97.38 97.72 562 97.43 97.38 97.22 560 97.77 97.44 97.38 558 97.30 97.58 97.60 556 97.71 97.53 97.46 554 97.36 97.70 97.15 552 97.54 97.41 97.44 550 97.44 97.40 97.36 548 97.28 97.38 97.24 546 97.37 97.50 97.22 544 97.26 97.61 97.22 542 97.22 97.23 97.36 540 97.56 97.24 97.16 538 97.28 97.26 97.15 536 97.07 97.48 97.26 534 97.07 97.33 97.08 532 97.09 97.03 97.12 530 97.29 97.27 96.96 528 96.78 97.02 97.19 526 97.16 97.02 96.94 524 96.96 97.23 96.95 522 97.01 96.74 96.74 520 96.70 96.85 96.80 518 96.48 96.90 96.60 516 96.85 96.98 96.62 514 96.54 96.83 96.68 512 96.52 96.82 96.96 510 96.42 96.77 96.47 508 96.79 96.79 96.47 506 96.39 96.67 96.44 504 96.13 96.64 96.56 502 95.95 96.37 96.39 500 96.08 96.51 96.31 498 96.18 96.44 96.37 496 95.98 96.41 96.18 494 96.15 96.29 96.00 492 96.04 96.37 95.74 490 95.88 96.09 95.73 488 95.72 95.92 95.66 486 95.81 95.95 95.65 484 95.73 95.98 95.64 482 95.69 95.87 95.40 480 95.28 95.70 95.68 478 95.42 95.70 95.42 476 95.03 95.46 95.23 474 95.20 95.58 95.39 472 94.98 95.43 95.17 470 94.87 95.40 94.96 468 95.04 95.11 94.89 466 94.65 95.15 94.76 464 94.59 94.66 94.72 462 94.48 94.72 94.40 460 94.57 94.82 94.17 458 93.88 94.60 94.13 456 94.07 94.39 94.16 454 94.23 94.63 93.78 452 93.84 94.12 93.79 450 93.79 94.33 93.42 448 93.65 93.87 93.80 446 92.96 93.93 93.67 444 93.25 93.66 93.36 442 93.07 93.22 93.10 440 92.88 93.60 93.21 438 92.81 93.41 93.03 436 92.76 93.27 92.60 434 92.67 93.20 92.95 432 92.36 93.13 92.11 430 92.73 92.97 92.29 428 92.19 92.27 91.89 426 91.69 92.38 91.75 424 92.05 91.61 91.96 422 91.21 92.21 91.10 420 91.60 91.79 91.42 418 91.41 91.43 91.12 416 90.70 90.72 90.75 414 90.81 91.14 91.09 412 90.81 90.84 90.33 410 90.84 90.66 90.29 408 90.15 90.27 90.93 406 90.15 90.21 89.80 404 89.39 90.30 89.19 402 89.40 88.85 89.09 400 89.28 89.32 88.96 398 88.33 89.24 88.93 396 88.34 88.78 88.57 394 87.94 87.28 88.20 392 87.30 87.99 87.07 390 86.14 87.08 86.66 388 86.34 87.76 86.59 386 86.37 86.58 87.49 384 85.29 85.61 86.13 382 85.04 84.95 85.24 380 85.77 84.69 83.85 1650 98.94 99.11 98.99 1640 98.95 99.08 98.98 1630 98.94 99.10 98.99 1620 98.93 99.09 98.99 1610 98.94 99.09 98.97 1600 98.93 99.10 98.98 1590 98.94 99.08 98.98 1580 98.93 99.10 98.98 1570 98.93 99.09 98.98 1560 98.93 99.09 98.97 1550 98.94 99.09 98.99 1540 98.94 99.10 98.97 1530 98.94 99.09 98.97 1520 98.94 99.09 98.97 1510 98.93 99.10 98.97 1500 98.93 99.09 98.98 1490 98.93 99.09 98.98 1480 98.94 99.10 98.98 1470 98.93 99.08 98.97 1460 98.93 99.09 98.98 1450 98.93 99.10 98.97 1440 98.93 99.10 98.99 1430 98.93 99.09 98.97 1420 98.93 99.09 98.98 1410 98.93 99.10 98.99 1400 98.93 99.09 98.97 1390 98.93 99.10 98.98 1380 98.92 99.08 98.96 1370 98.93 99.09 98.97 1360 98.92 99.09 98.96 1350 98.92 99.08 98.96 1340 98.92 99.07 98.96 1330 98.92 99.08 98.95 1320 98.92 99.07 98.95 1310 98.91 99.07 98.95 1300 98.91 99.07 98.95 1290 98.91 99.07 98.95 1280 98.91 99.07 98.95 1270 98.91 99.06 98.94 1260 98.90 99.06 98.92 1250 98.90 99.06 98.92 1240 98.89 99.05 98.92 1230 98.89 99.04 98.92 1220 98.89 99.04 98.91 1210 98.89 99.03 98.91 1200 98.88 99.02 98.90 1190 98.88 99.03 98.90 1180 98.89 99.03 98.88 1170 98.88 99.02 98.90 1160 98.88 99.02 98.90 1150 98.88 99.03 98.88 1140 98.87 99.01 98.88 1130 98.88 99.00 98.87 1120 98.86 99.01 98.87 1110 98.87 99.00 98.87 1100 98.86 99.01 98.87 1090 98.86 98.99 98.86 1080 98.86 99.00 98.86 1070 98.85 98.98 98.86 1060 98.85 98.97 98.85 1050 98.85 98.98 98.85 1040 98.85 98.98 98.84 1030 98.85 98.98 98.83 1020 98.84 98.97 98.83 1010 98.84 98.96 98.83 1000 98.82 98.97 98.83 990 98.82 98.95 98.84 980 98.82 98.94 98.83 970 98.83 98.93 98.81 960 98.82 98.93 98.82 950 98.83 98.94 98.82