# 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 2020-07-15 (7881 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 91.53 91.73 92.05 998 92.17 92.13 92.18 996 91.15 90.42 91.37 994 90.81 91.54 91.00 992 91.34 91.41 91.58 990 91.32 91.36 91.83 988 91.00 90.62 92.08 986 90.49 92.11 91.86 984 91.51 91.68 91.61 982 91.47 91.04 90.68 980 91.60 91.43 90.93 978 91.40 90.63 91.08 976 90.72 90.66 91.41 974 91.22 90.83 91.08 972 90.91 91.90 91.11 970 91.28 91.07 91.36 968 90.56 90.24 90.99 966 90.80 91.06 90.12 964 90.33 90.67 91.34 962 90.77 91.18 90.56 960 91.11 90.72 90.74 958 90.61 90.86 90.94 956 89.98 90.69 90.28 954 90.38 90.36 90.75 952 90.35 90.04 91.03 950 90.23 89.75 90.60 948 90.43 90.53 90.03 946 90.82 90.14 90.27 944 89.87 89.83 90.01 942 89.03 89.62 89.62 940 89.57 89.77 89.61 938 89.91 89.79 89.81 936 89.22 89.61 89.63 934 89.19 90.04 89.89 932 89.27 89.61 89.35 930 89.37 89.07 89.42 928 89.20 88.97 89.16 926 89.21 89.01 89.22 924 88.88 88.83 88.91 922 89.07 88.95 89.13 920 88.76 88.65 88.34 918 88.47 88.56 88.31 916 88.25 88.53 88.51 914 88.63 88.54 88.04 912 88.13 88.15 88.21 910 88.20 88.02 87.94 908 88.14 87.77 87.64 906 87.94 87.45 87.66 904 87.64 87.82 87.95 902 87.35 87.74 87.77 900 87.25 87.57 87.19 898 87.36 87.33 87.84 896 86.97 86.79 86.84 894 86.96 87.61 86.95 892 86.78 86.65 87.17 890 86.72 86.77 86.57 888 86.64 86.33 86.50 886 86.36 86.49 86.40 884 86.24 85.83 86.30 882 85.78 86.29 85.89 880 85.70 85.84 86.01 878 85.89 86.05 85.90 876 85.67 85.81 85.83 874 85.47 85.61 85.73 872 85.25 85.46 85.43 870 85.52 85.27 85.40 868 85.13 84.86 84.99 866 85.02 85.21 84.86 864 84.80 84.65 84.76 862 84.44 84.76 84.47 860 84.47 84.53 84.38 858 84.40 84.28 84.20 856 84.30 84.11 83.99 854 84.11 84.11 84.04 852 84.17 84.17 83.80 850 83.98 84.32 83.97 848 84.04 84.10 83.86 846 83.61 83.82 83.74 844 83.65 83.49 83.66 842 83.73 83.83 84.02 840 83.64 83.85 83.52 838 83.40 83.39 83.61 836 83.25 83.61 83.77 834 83.78 83.58 83.56 832 83.55 83.62 83.46 830 83.54 83.33 83.24 828 83.07 83.73 83.32 826 83.65 83.47 83.37 824 83.43 83.30 83.34 822 83.43 83.51 83.40 820 83.45 83.49 83.35 818 83.36 83.20 83.19 816 83.30 83.63 83.41 814 83.62 83.48 83.32 812 83.37 83.32 83.36 810 83.46 83.40 83.02 808 83.68 83.47 83.81 806 83.33 83.45 83.40 804 83.37 83.70 83.76 802 83.62 83.36 83.51 800 83.66 83.62 83.63 798 83.63 83.90 83.91 796 83.82 83.97 83.77 794 83.81 84.13 84.00 792 83.65 83.90 83.64 790 83.86 84.02 84.13 788 83.83 84.19 83.90 786 84.22 84.03 84.23 784 84.12 84.53 84.08 782 84.33 84.37 84.07 780 84.69 84.13 84.38 778 84.53 84.44 84.50 776 84.13 84.49 84.52 774 84.34 84.20 84.67 772 84.80 84.63 84.66 770 84.83 84.36 84.78 768 84.89 84.84 84.63 766 84.79 84.80 85.10 764 85.02 84.89 84.66 762 85.12 84.91 84.79 760 84.99 85.33 84.99 758 85.17 85.24 84.86 756 85.37 85.17 84.98 754 85.29 85.22 85.23 752 85.43 85.21 85.46 750 85.24 85.19 85.58 748 85.18 85.17 85.27 746 85.53 85.22 85.38 744 85.26 85.29 85.46 742 85.40 85.29 85.85 740 85.61 85.53 85.55 738 85.59 85.63 85.67 736 85.33 85.42 85.85 734 85.52 85.57 85.49 732 85.83 85.66 85.52 730 85.94 85.92 85.73 728 85.69 85.79 85.86 726 85.81 85.87 85.89 724 86.10 85.97 85.91 722 85.72 85.60 85.85 720 85.83 85.90 85.95 718 86.17 85.92 86.15 716 85.92 85.98 85.95 714 86.12 86.09 86.19 712 86.00 86.06 86.05 710 86.39 86.16 86.51 708 86.19 86.18 86.22 706 86.09 86.24 86.39 704 86.14 86.28 86.45 702 86.32 86.33 86.15 700 86.17 86.24 86.47 698 86.26 86.27 86.55 696 86.36 86.21 86.17 694 86.18 86.14 86.47 692 86.34 86.28 86.71 690 86.39 86.37 86.50 688 86.43 86.34 86.36 686 86.16 86.40 86.45 684 86.63 86.44 86.51 682 86.60 86.50 86.47 680 86.61 86.36 86.54 678 86.62 86.59 86.41 676 86.64 86.67 86.49 674 86.60 86.69 86.57 672 86.48 86.80 86.62 670 86.56 86.58 86.73 668 86.86 86.84 86.68 666 86.81 86.63 86.60 664 86.70 86.72 86.88 662 86.88 86.46 86.89 660 86.82 86.78 86.75 658 86.86 86.87 86.76 656 86.95 86.77 86.87 654 86.83 86.76 86.91 652 86.76 86.65 86.89 650 86.79 86.93 86.82 648 86.96 86.83 87.00 646 86.87 86.87 86.78 644 86.91 86.76 87.06 642 86.82 86.76 87.04 640 86.92 86.79 87.00 638 86.88 86.67 86.97 636 86.99 86.86 87.02 634 86.90 86.93 86.99 632 86.92 86.87 86.93 630 87.16 86.86 87.12 628 86.98 86.89 87.09 626 86.93 87.11 87.02 624 87.21 87.07 87.10 622 87.00 86.89 86.87 620 87.06 86.97 87.23 618 87.14 87.02 87.07 616 87.13 86.99 87.08 614 87.22 87.01 87.19 612 86.91 86.81 87.29 610 87.06 87.19 87.11 608 87.14 86.92 87.18 606 87.23 87.10 87.14 604 87.15 87.04 87.14 602 87.13 86.91 87.10 600 87.17 87.10 87.22 598 87.15 86.93 87.01 596 87.11 87.02 87.04 594 87.25 86.85 87.13 592 87.01 87.01 87.16 590 87.31 86.95 87.20 588 87.42 87.09 87.29 586 87.09 87.13 87.16 584 87.29 87.05 87.22 582 87.13 87.09 87.28 580 87.22 87.00 87.31 578 87.14 87.08 87.24 576 87.09 87.15 87.18 574 87.09 86.97 87.26 572 87.26 87.09 87.30 570 87.25 87.17 87.19 568 87.03 87.13 87.36 566 87.13 87.02 87.27 564 87.16 86.96 87.24 562 87.12 87.13 87.20 560 87.16 86.98 87.27 558 87.12 87.14 87.22 556 87.14 86.93 87.21 554 87.19 86.95 87.12 552 87.13 86.98 87.25 550 86.97 87.13 87.08 548 87.09 86.85 87.14 546 86.99 86.88 87.11 544 87.11 87.05 87.03 542 87.04 87.14 87.03 540 87.17 87.05 86.94 538 87.34 86.98 86.95 536 87.18 87.07 87.22 534 87.18 86.97 87.20 532 87.05 86.85 87.19 530 86.94 86.97 87.19 528 86.99 87.11 87.14 526 87.18 86.65 86.99 524 87.01 86.86 87.00 522 86.91 86.97 87.28 520 86.93 87.06 87.33 518 87.14 86.73 87.07 516 87.01 86.86 87.11 514 86.92 86.87 87.17 512 86.89 86.84 86.90 510 86.99 86.87 86.83 508 87.06 86.76 86.96 506 86.91 86.86 86.98 504 86.85 86.89 86.80 502 86.97 86.77 86.76 500 86.87 86.76 86.93 498 86.80 86.54 87.04 496 86.64 86.56 86.75 494 86.44 86.44 86.89 492 86.49 86.36 86.50 490 86.83 86.40 86.65 488 86.52 86.56 86.69 486 86.57 86.52 87.07 484 86.53 86.30 86.64 482 86.66 86.49 86.51 480 86.67 86.58 86.52 478 86.52 86.36 86.58 476 86.52 86.35 86.65 474 86.34 86.22 86.60 472 86.39 86.23 86.77 470 86.58 86.05 86.88 468 86.48 86.10 86.36 466 86.32 86.23 86.42 464 86.37 86.28 86.26 462 86.28 86.05 86.18 460 86.21 85.91 86.13 458 86.12 85.79 86.19 456 86.09 86.04 86.15 454 86.12 86.05 86.07 452 86.36 85.87 86.06 450 86.18 85.95 85.87 448 85.92 85.84 86.08 446 85.93 85.83 86.16 444 85.71 85.71 85.76 442 86.01 85.72 86.02 440 86.04 85.69 85.93 438 85.47 85.26 85.84 436 85.14 85.16 85.30 434 85.64 85.37 85.90 432 85.92 85.49 85.93 430 86.00 85.65 85.94 428 85.29 85.46 85.67 426 85.92 85.50 85.59 424 85.51 85.37 85.22 422 85.77 85.31 85.23 420 85.56 85.23 84.70 418 85.03 85.55 85.49 416 84.98 84.61 85.47 414 85.25 85.02 85.10 412 85.08 85.13 84.88 410 84.90 84.42 84.90 408 85.06 84.93 85.06 406 84.69 84.80 85.14 404 84.74 85.18 85.33 402 84.85 84.55 85.30 400 84.64 84.54 84.70 398 84.40 84.54 84.05 396 84.82 84.60 84.52 394 84.45 83.97 84.63 392 84.08 85.15 83.19 390 84.37 83.98 84.89 388 84.43 84.45 84.41 386 83.59 84.92 84.89 384 84.35 84.40 84.40 382 84.71 84.74 83.61 380 84.20 83.88 83.39 1650 96.05 96.07 96.01 1640 96.07 96.09 96.03 1630 96.07 96.08 96.04 1620 96.08 96.08 96.03 1610 96.08 96.09 96.04 1600 96.08 96.09 96.04 1590 96.08 96.08 96.03 1580 96.06 96.07 96.03 1570 96.06 96.07 96.02 1560 96.05 96.05 96.02 1550 96.04 96.05 96.00 1540 96.03 96.03 95.99 1530 96.03 96.03 95.99 1520 96.00 96.01 95.98 1510 96.00 96.02 95.95 1500 95.99 95.98 95.95 1490 95.97 95.98 95.92 1480 95.95 95.94 95.92 1470 95.93 95.95 95.90 1460 95.91 95.91 95.88 1450 95.90 95.90 95.86 1440 95.89 95.88 95.84 1430 95.86 95.86 95.83 1420 95.84 95.84 95.81 1410 95.82 95.81 95.79 1400 95.80 95.80 95.76 1390 95.78 95.79 95.74 1380 95.76 95.75 95.73 1370 95.73 95.73 95.70 1360 95.71 95.70 95.68 1350 95.66 95.66 95.63 1340 95.63 95.63 95.60 1330 95.60 95.59 95.57 1320 95.57 95.56 95.54 1310 95.53 95.53 95.50 1300 95.50 95.49 95.47 1290 95.46 95.46 95.43 1280 95.42 95.43 95.40 1270 95.38 95.38 95.36 1260 95.34 95.34 95.33 1250 95.29 95.30 95.27 1240 95.25 95.25 95.22 1230 95.20 95.20 95.18 1220 95.14 95.15 95.13 1210 95.10 95.09 95.08 1200 95.03 95.04 95.02 1190 94.97 94.97 94.95 1180 94.90 94.91 94.89 1170 94.83 94.84 94.81 1160 94.75 94.76 94.75 1150 94.68 94.69 94.67 1140 94.60 94.61 94.58 1130 94.51 94.50 94.50 1120 94.42 94.42 94.41 1110 94.32 94.32 94.30 1100 94.21 94.20 94.20 1090 94.09 94.09 94.08 1080 93.96 93.95 93.95 1070 93.82 93.82 93.81 1060 93.67 93.68 93.66 1050 93.50 93.51 93.51 1040 93.32 93.31 93.33 1030 93.13 93.14 93.13 1020 92.91 92.92 92.91 1010 92.69 92.68 92.68 1000 92.41 92.41 92.41 990 92.12 92.14 92.13 980 91.80 91.80 91.82 970 91.45 91.45 91.46 960 91.05 91.04 91.06 950 90.62 90.61 90.62