# Subaru Telescope Cassegrain Optical Secondary Mirror In-Situ Measured Reflectivity # Coated with Aluminum at Pilkington on 1998-12-17 # Opened the vacuum chamber: No information # Measured with Subaru Portable Spectrophotometer (SPS) on 2022-09-22 (8680 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 91.65 91.47 92.16 998 91.59 91.42 91.19 996 91.49 91.49 91.26 994 91.40 90.51 90.61 992 91.84 92.14 91.83 990 92.58 92.23 91.07 988 90.78 91.69 90.95 986 91.95 91.07 91.10 984 90.94 91.42 90.68 982 91.56 91.59 90.16 980 90.68 90.32 90.84 978 91.71 91.10 90.68 976 91.25 90.70 91.34 974 90.49 90.27 90.40 972 90.03 90.27 90.95 970 90.80 91.09 90.16 968 90.93 90.19 91.14 966 90.15 90.59 90.41 964 90.89 90.52 90.31 962 89.07 87.88 90.92 960 90.38 90.86 91.10 958 90.91 89.66 90.30 956 90.78 90.40 90.76 954 90.44 89.55 89.92 952 89.65 90.40 90.21 950 90.36 89.89 90.34 948 89.83 89.83 89.82 946 90.04 89.26 89.73 944 89.90 89.18 90.22 942 89.43 89.80 90.28 940 89.43 89.74 89.14 938 89.71 89.14 90.04 936 89.44 89.74 89.21 934 89.15 88.78 89.31 932 89.56 89.23 89.10 930 89.00 89.00 89.05 928 88.82 89.48 88.65 926 88.70 89.04 88.62 924 88.94 88.31 89.10 922 88.98 88.27 87.97 920 89.30 88.46 88.00 918 88.94 88.78 88.06 916 88.36 88.34 88.29 914 88.33 88.07 88.32 912 88.49 87.92 87.68 910 87.75 87.72 87.70 908 88.14 88.17 87.44 906 87.85 87.62 87.68 904 87.91 87.30 87.40 902 87.24 87.40 87.19 900 87.50 87.47 87.08 898 87.16 87.28 86.95 896 87.07 87.22 86.90 894 86.87 86.64 86.96 892 86.80 86.49 86.58 890 86.86 86.43 86.54 888 86.27 86.39 86.22 886 85.98 86.12 86.20 884 85.96 85.82 86.14 882 85.76 86.08 85.91 880 85.68 85.75 85.76 878 85.89 85.53 85.58 876 85.45 85.31 85.22 874 85.40 85.52 85.56 872 85.14 85.39 85.26 870 85.25 85.10 85.00 868 84.79 84.73 84.80 866 84.95 84.34 85.04 864 84.66 84.32 84.96 862 85.10 84.24 84.39 860 84.28 84.46 84.55 858 84.09 84.15 83.75 856 84.58 84.33 84.05 854 84.23 84.07 84.54 852 84.15 83.99 84.11 850 84.26 83.92 83.76 848 83.75 83.62 83.64 846 83.50 83.47 83.61 844 83.32 84.06 83.61 842 83.86 83.44 83.79 840 83.54 83.43 83.62 838 83.58 83.81 83.64 836 83.29 83.35 83.63 834 83.50 83.21 83.37 832 83.05 83.56 83.23 830 83.14 83.55 83.43 828 83.50 83.54 83.46 826 83.35 83.52 83.56 824 83.83 83.40 83.86 822 83.33 82.89 83.42 820 83.00 83.21 83.72 818 83.32 83.15 83.02 816 83.54 82.89 82.80 814 83.42 83.59 83.02 812 83.14 83.24 83.23 810 83.68 83.38 83.62 808 83.31 83.52 83.49 806 83.77 82.91 83.09 804 83.41 83.04 83.76 802 83.79 83.60 83.63 800 83.54 83.83 83.52 798 83.95 83.48 83.76 796 83.83 83.52 83.79 794 83.91 83.55 83.78 792 83.98 83.68 83.70 790 84.40 83.72 83.96 788 84.26 84.01 84.18 786 84.30 83.89 84.13 784 84.08 84.34 84.02 782 84.43 84.11 84.08 780 84.42 84.09 84.17 778 84.17 84.48 84.22 776 84.58 84.19 84.59 774 84.42 84.52 84.32 772 84.45 84.35 84.82 770 85.01 84.66 84.59 768 84.55 84.66 84.58 766 84.75 84.60 84.34 764 84.55 84.85 84.79 762 84.91 84.73 85.00 760 84.95 84.98 84.90 758 85.01 85.04 84.91 756 85.00 85.11 85.20 754 85.15 84.99 85.19 752 85.17 85.01 85.11 750 84.98 85.05 85.17 748 85.39 85.00 85.25 746 85.43 85.13 85.15 744 85.46 85.14 85.25 742 85.53 85.47 85.51 740 85.67 85.34 85.37 738 85.32 85.51 85.72 736 85.68 85.40 85.51 734 85.56 85.71 85.80 732 85.71 85.62 85.75 730 85.65 85.60 85.48 728 85.70 85.87 85.96 726 85.72 85.74 85.78 724 85.72 85.77 85.87 722 86.05 85.75 85.88 720 85.56 85.89 86.01 718 85.97 85.88 85.89 716 86.35 85.80 86.05 714 86.31 85.90 85.82 712 86.05 85.93 85.81 710 86.20 85.99 86.11 708 85.94 86.15 86.03 706 86.36 86.26 86.09 704 86.26 85.98 86.26 702 86.15 86.12 86.02 700 86.19 86.26 86.20 698 86.10 86.21 86.14 696 86.29 86.07 86.07 694 86.35 86.05 86.52 692 86.36 86.19 86.52 690 86.37 86.25 86.32 688 86.58 86.48 86.49 686 86.57 86.39 86.32 684 86.33 86.28 86.55 682 86.09 86.45 86.57 680 86.68 86.53 86.54 678 86.67 86.56 86.47 676 86.63 86.41 86.58 674 86.68 86.54 86.66 672 86.49 86.40 86.77 670 86.38 86.57 86.80 668 86.75 86.46 86.63 666 86.78 86.49 86.73 664 86.74 86.51 86.62 662 86.72 86.50 86.58 660 86.58 86.61 86.54 658 86.84 86.55 86.76 656 86.74 86.49 86.62 654 86.80 86.89 86.78 652 86.78 86.72 86.72 650 86.67 86.67 86.71 648 86.65 86.82 86.65 646 86.90 86.69 86.63 644 86.97 86.61 86.72 642 86.95 86.76 86.72 640 86.92 86.82 86.83 638 86.95 86.74 86.91 636 87.07 86.67 86.92 634 86.91 86.75 86.88 632 86.87 86.76 87.00 630 87.08 86.75 86.98 628 86.85 86.84 86.81 626 86.96 86.67 86.86 624 86.95 86.97 86.88 622 86.95 86.98 86.89 620 87.15 86.83 87.02 618 87.10 86.82 87.05 616 86.82 86.77 86.92 614 87.13 86.83 87.03 612 87.22 87.02 86.99 610 87.12 86.97 87.11 608 87.26 87.00 86.89 606 87.21 87.03 86.96 604 86.86 86.86 87.03 602 87.03 87.03 86.99 600 87.09 86.93 86.97 598 86.88 86.86 87.02 596 87.04 86.86 87.16 594 86.98 86.98 87.01 592 87.16 86.78 87.11 590 86.84 87.02 87.09 588 86.97 86.90 86.99 586 86.94 86.82 86.95 584 86.73 87.11 86.67 582 87.02 87.08 86.94 580 87.27 87.02 87.08 578 87.16 86.90 86.99 576 86.90 87.09 86.88 574 87.06 86.93 86.90 572 86.93 86.85 86.89 570 87.12 87.06 87.20 568 87.08 87.02 87.12 566 86.79 86.94 86.92 564 87.00 87.03 87.01 562 86.79 87.01 86.86 560 86.98 86.90 86.92 558 86.97 86.97 87.05 556 87.07 86.97 86.97 554 87.08 86.88 86.94 552 87.08 86.85 87.11 550 86.91 87.00 86.90 548 86.88 86.93 86.81 546 87.02 86.93 86.74 544 87.04 86.92 86.77 542 87.09 86.98 86.81 540 86.99 87.11 86.77 538 87.12 86.98 86.75 536 86.94 86.80 86.86 534 86.84 86.82 86.84 532 87.05 87.00 86.75 530 86.97 86.98 86.67 528 87.01 86.90 86.81 526 86.97 86.89 86.99 524 87.03 86.68 86.75 522 86.70 86.76 86.72 520 86.87 86.70 86.74 518 86.81 86.80 86.74 516 86.76 86.69 86.50 514 86.97 86.53 86.64 512 86.78 86.58 86.72 510 86.80 86.84 86.81 508 86.60 86.91 86.74 506 86.66 86.80 86.61 504 86.46 86.31 86.54 502 86.83 86.57 86.65 500 86.75 86.41 86.47 498 86.68 86.25 86.45 496 86.69 86.96 86.50 494 86.79 86.65 86.28 492 86.55 86.19 86.29 490 86.36 86.64 86.57 488 86.37 86.52 86.25 486 86.59 86.44 86.39 484 86.38 86.30 86.48 482 86.32 86.51 86.31 480 86.20 86.33 86.11 478 86.49 86.20 86.08 476 86.42 86.19 86.60 474 86.48 86.02 85.85 472 86.13 85.91 86.02 470 85.84 86.21 86.11 468 86.49 86.05 85.74 466 86.24 85.86 85.99 464 85.70 85.93 85.74 462 85.63 85.94 86.14 460 85.56 85.54 85.87 458 85.74 85.70 85.81 456 85.83 85.74 85.66 454 85.52 85.64 85.12 452 85.43 85.78 85.33 450 85.23 85.53 85.12 448 85.45 85.50 85.20 446 85.65 85.41 85.29 444 85.56 85.81 85.37 442 85.76 85.71 85.71 440 85.50 85.81 85.64 438 85.62 85.47 85.17 436 85.44 85.30 85.71 434 85.50 85.75 85.16 432 85.51 85.60 84.70 430 85.80 85.34 85.30 428 84.95 85.37 85.38 426 85.61 85.74 85.45 424 85.41 85.01 85.02 422 85.60 85.60 85.09 420 85.86 84.97 85.00 418 85.36 85.06 85.19 416 85.26 84.89 84.58 414 84.49 85.37 84.74 412 84.77 85.54 85.03 410 84.96 85.42 84.84 408 84.65 85.31 84.92 406 84.46 85.39 85.49 404 85.87 84.96 85.18 402 84.87 85.33 83.99 400 84.91 84.96 84.92 398 84.88 84.90 84.81 396 85.23 85.17 84.20 394 84.61 84.31 84.18 392 84.48 84.12 84.57 390 84.25 84.12 83.70 388 84.10 84.42 83.85 386 85.16 84.80 83.94 384 84.39 83.89 83.85 382 84.55 84.97 85.04 380 84.78 84.88 84.09 1650 95.88 95.74 95.89 1640 95.90 95.75 95.89 1630 95.89 95.77 95.89 1620 95.87 95.75 95.88 1610 95.89 95.75 95.90 1600 95.88 95.76 95.89 1590 95.88 95.75 95.88 1580 95.87 95.74 95.89 1570 95.87 95.73 95.87 1560 95.85 95.73 95.87 1550 95.84 95.71 95.85 1540 95.83 95.70 95.84 1530 95.83 95.68 95.82 1520 95.80 95.68 95.82 1510 95.79 95.65 95.79 1500 95.77 95.65 95.79 1490 95.76 95.62 95.76 1480 95.73 95.59 95.76 1470 95.73 95.59 95.74 1460 95.71 95.57 95.71 1450 95.71 95.55 95.71 1440 95.68 95.53 95.67 1430 95.65 95.51 95.65 1420 95.63 95.48 95.62 1410 95.61 95.47 95.63 1400 95.60 95.45 95.59 1390 95.58 95.41 95.57 1380 95.54 95.39 95.54 1370 95.53 95.37 95.51 1360 95.49 95.33 95.48 1350 95.44 95.29 95.44 1340 95.41 95.27 95.41 1330 95.38 95.22 95.38 1320 95.35 95.19 95.34 1310 95.31 95.17 95.30 1300 95.28 95.12 95.28 1290 95.23 95.08 95.24 1280 95.21 95.06 95.19 1270 95.16 95.00 95.17 1260 95.11 94.96 95.09 1250 95.07 94.92 95.05 1240 95.01 94.86 95.01 1230 94.96 94.81 94.96 1220 94.92 94.76 94.91 1210 94.85 94.69 94.84 1200 94.78 94.63 94.78 1190 94.71 94.57 94.71 1180 94.65 94.51 94.65 1170 94.58 94.43 94.57 1160 94.51 94.37 94.50 1150 94.44 94.28 94.41 1140 94.34 94.19 94.34 1130 94.26 94.11 94.25 1120 94.16 94.01 94.16 1110 94.06 93.91 94.04 1100 93.94 93.80 93.95 1090 93.82 93.70 93.83 1080 93.69 93.55 93.68 1070 93.57 93.40 93.54 1060 93.41 93.26 93.40 1050 93.25 93.10 93.23 1040 93.05 92.93 93.05 1030 92.88 92.73 92.84 1020 92.66 92.50 92.64 1010 92.41 92.26 92.41 1000 92.15 92.00 92.15 990 91.87 91.72 91.86 980 91.54 91.39 91.52 970 91.20 91.05 91.17 960 90.81 90.64 90.78 950 90.35 90.22 90.33