# 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 2024-07-03 (9330 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 90.91 91.03 91.37 998 93.07 91.48 91.57 996 90.61 90.92 91.13 994 90.31 91.52 90.52 992 91.12 91.37 91.10 990 91.56 92.06 91.17 988 91.46 91.48 90.79 986 91.25 90.92 90.81 984 91.03 91.34 90.36 982 91.03 90.31 90.31 980 90.64 90.64 91.92 978 91.54 91.53 89.91 976 91.16 91.01 90.95 974 90.85 90.84 90.89 972 90.87 91.23 90.23 970 90.76 90.82 90.34 968 91.16 89.91 90.19 966 90.70 90.72 91.01 964 90.30 90.69 90.22 962 90.61 88.53 90.08 960 90.19 90.48 90.72 958 89.83 90.22 90.24 956 90.37 90.42 89.91 954 89.96 90.68 89.86 952 89.34 90.20 89.36 950 89.96 90.38 89.67 948 89.33 89.82 89.34 946 89.55 89.78 89.25 944 89.62 89.90 89.04 942 89.21 89.94 88.86 940 89.20 89.66 89.04 938 89.68 89.58 89.50 936 89.00 89.17 89.47 934 89.55 88.95 89.42 932 89.01 88.95 88.96 930 88.94 88.87 89.08 928 88.68 88.99 88.67 926 88.78 88.17 89.21 924 88.81 89.25 88.51 922 88.95 89.15 88.75 920 88.33 88.72 87.99 918 88.53 88.35 88.07 916 87.87 87.80 88.26 914 88.43 88.18 88.58 912 88.05 88.07 87.97 910 87.27 87.84 87.79 908 87.68 87.84 87.56 906 87.61 87.59 87.98 904 87.31 87.34 86.90 902 87.75 87.32 87.05 900 87.20 86.85 86.63 898 86.73 86.97 87.19 896 86.65 87.00 86.30 894 86.44 86.69 86.43 892 86.56 86.94 86.39 890 86.18 86.58 86.37 888 86.23 86.50 86.25 886 86.11 86.50 86.41 884 85.56 86.48 85.92 882 85.71 85.65 85.71 880 85.55 85.79 85.48 878 85.09 85.71 85.37 876 85.64 85.38 85.39 874 85.01 85.10 85.68 872 85.06 84.60 85.04 870 84.86 84.58 84.83 868 84.94 85.13 84.77 866 84.24 85.09 84.27 864 84.46 84.58 84.51 862 84.52 84.29 84.03 860 84.07 84.16 84.36 858 83.93 84.68 84.11 856 83.75 84.15 83.67 854 84.12 84.34 84.01 852 83.74 83.86 84.09 850 83.55 83.68 83.98 848 83.67 83.68 83.85 846 83.61 83.43 83.37 844 83.57 83.37 83.35 842 83.28 82.98 83.30 840 83.48 83.47 83.69 838 83.30 83.05 83.09 836 83.23 83.30 83.35 834 83.38 83.37 83.37 832 83.26 83.08 83.02 830 83.51 83.25 83.12 828 83.21 83.44 83.55 826 83.32 83.36 83.14 824 82.73 83.13 83.18 822 83.11 83.35 83.18 820 83.46 83.34 83.41 818 83.16 83.48 83.12 816 82.83 83.07 83.10 814 83.29 83.35 83.10 812 83.17 83.16 83.10 810 83.30 83.31 83.55 808 83.60 83.72 83.57 806 83.32 82.93 83.27 804 83.73 83.61 83.28 802 83.60 83.64 83.60 800 83.57 83.34 83.67 798 83.79 83.52 83.55 796 83.62 83.64 83.57 794 83.65 83.93 83.64 792 83.71 83.79 83.70 790 83.59 83.89 83.99 788 83.79 84.21 84.19 786 84.00 84.28 83.85 784 83.76 83.84 83.96 782 83.75 84.09 83.77 780 83.99 83.87 84.12 778 84.41 83.94 84.15 776 84.09 84.32 84.26 774 84.13 84.18 84.58 772 84.39 84.91 84.44 770 84.32 84.80 84.81 768 84.49 84.70 84.91 766 84.48 84.87 84.44 764 84.63 84.74 84.55 762 84.46 84.78 84.50 760 84.67 85.14 84.70 758 84.99 84.96 84.87 756 84.85 85.05 85.14 754 84.64 84.94 84.79 752 85.04 84.97 85.22 750 85.12 85.21 85.00 748 85.15 85.53 85.29 746 85.13 85.35 85.29 744 85.07 85.45 85.16 742 85.29 85.25 85.53 740 85.19 85.39 85.30 738 85.48 85.59 85.35 736 85.41 85.61 85.42 734 85.18 85.85 85.58 732 85.58 85.43 85.53 730 85.75 85.53 85.53 728 85.61 85.74 85.71 726 85.70 85.89 85.63 724 85.67 85.77 85.58 722 85.48 85.67 85.96 720 85.32 85.93 85.58 718 85.91 85.94 85.99 716 85.70 86.13 86.09 714 85.69 86.11 86.00 712 85.86 86.08 85.91 710 85.98 85.72 85.79 708 85.65 86.06 86.13 706 86.02 86.23 86.19 704 86.18 86.36 86.21 702 86.19 86.19 86.19 700 86.16 86.37 86.31 698 85.90 86.24 86.21 696 86.21 86.43 86.40 694 86.24 86.47 86.25 692 86.17 86.58 86.35 690 86.11 86.43 86.28 688 86.35 86.46 86.75 686 86.36 86.26 86.32 684 86.33 86.56 86.51 682 86.21 86.55 86.54 680 86.23 86.45 86.58 678 86.21 86.32 86.46 676 86.20 86.49 86.66 674 86.32 86.63 86.34 672 86.39 86.69 86.67 670 86.34 86.62 86.61 668 86.47 86.66 86.66 666 86.40 86.76 86.97 664 86.59 86.73 86.59 662 86.59 86.89 86.67 660 86.41 86.62 86.67 658 86.41 86.75 86.74 656 86.54 86.59 86.76 654 86.62 86.77 86.73 652 86.62 86.88 86.65 650 86.53 86.91 86.68 648 86.57 86.92 86.86 646 86.85 86.81 87.00 644 86.59 86.74 86.82 642 86.59 86.91 86.64 640 86.72 86.73 86.72 638 86.65 86.94 86.83 636 86.76 86.98 86.76 634 86.75 86.98 86.93 632 86.65 86.87 86.95 630 86.69 86.78 86.71 628 86.64 87.02 86.99 626 86.67 87.07 86.89 624 86.73 86.91 86.82 622 86.58 86.93 86.90 620 86.66 87.00 86.95 618 86.83 86.91 86.83 616 86.84 87.07 87.11 614 86.76 86.87 87.10 612 86.55 86.99 86.95 610 86.64 87.02 86.91 608 86.58 87.05 87.02 606 86.85 87.17 87.08 604 86.72 87.68 87.10 602 86.75 87.33 86.83 600 86.78 86.95 87.07 598 86.68 86.98 87.01 596 86.90 86.99 86.96 594 86.64 86.95 87.06 592 86.79 87.10 87.04 590 86.76 87.01 86.83 588 86.70 87.12 86.93 586 86.75 86.82 86.79 584 86.90 87.21 86.85 582 86.67 87.24 86.91 580 86.90 87.01 86.68 578 86.72 86.97 86.92 576 86.90 86.92 87.04 574 86.78 86.93 87.10 572 86.65 87.09 86.91 570 86.68 86.74 87.07 568 86.69 87.03 86.77 566 86.72 86.77 86.91 564 86.69 87.06 86.99 562 86.67 86.97 86.84 560 86.66 86.81 86.80 558 86.54 86.94 86.78 556 86.70 86.93 86.95 554 86.68 87.02 87.17 552 86.69 87.14 87.00 550 86.61 86.71 86.86 548 86.52 86.89 86.96 546 86.51 86.89 86.76 544 86.53 86.94 86.85 542 86.76 86.87 86.62 540 86.63 86.79 86.74 538 86.69 87.05 86.92 536 86.60 86.90 86.59 534 86.48 86.95 86.73 532 86.59 86.80 86.52 530 86.45 86.67 86.71 528 86.43 86.87 86.69 526 86.36 86.72 86.57 524 86.38 86.73 86.78 522 86.47 86.60 86.64 520 86.27 86.71 86.87 518 86.39 86.81 86.53 516 86.29 86.65 86.35 514 86.32 86.75 86.72 512 86.21 86.80 86.68 510 86.11 86.51 86.66 508 86.24 86.60 86.40 506 86.36 86.42 86.56 504 86.36 86.68 86.50 502 86.35 86.41 86.47 500 86.02 86.58 86.47 498 86.09 86.30 86.16 496 86.23 86.22 86.27 494 85.99 86.55 86.31 492 85.91 86.47 86.32 490 86.13 86.45 86.18 488 86.09 86.15 86.32 486 86.07 86.29 86.17 484 85.95 86.20 86.18 482 86.04 86.31 86.03 480 86.01 86.26 86.30 478 85.84 86.22 86.25 476 85.83 86.13 85.89 474 85.78 86.05 85.72 472 85.75 86.11 86.04 470 85.68 85.79 85.80 468 85.67 86.00 85.76 466 85.56 85.97 85.74 464 85.71 86.07 85.70 462 85.36 85.99 85.72 460 85.71 85.77 85.89 458 85.69 85.71 85.25 456 85.29 85.61 85.30 454 85.24 85.88 85.50 452 85.15 85.46 85.48 450 85.15 85.64 85.55 448 85.05 85.71 85.14 446 85.21 85.38 85.74 444 85.13 85.30 85.32 442 85.12 85.56 85.10 440 85.19 85.81 85.42 438 85.19 85.51 85.56 436 85.18 85.22 85.57 434 84.58 85.11 85.12 432 84.85 85.43 85.14 430 84.54 85.37 85.00 428 84.96 85.35 84.83 426 84.48 85.30 85.49 424 85.13 84.94 85.15 422 84.56 85.77 85.15 420 84.35 84.93 85.42 418 84.86 85.13 84.80 416 84.33 85.03 84.73 414 84.51 84.76 84.94 412 84.59 84.77 84.74 410 84.90 84.83 84.87 408 84.52 85.15 84.63 406 83.92 84.61 84.17 404 84.38 84.52 84.74 402 84.43 84.43 84.61 400 83.60 83.77 84.33 398 83.80 84.48 83.96 396 85.96 81.74 84.47 394 84.19 83.88 84.69 392 83.91 83.51 82.91 390 83.12 83.90 83.87 388 82.84 84.51 83.71 386 84.09 84.10 84.15 384 83.77 84.10 83.37 382 83.71 83.06 83.25 380 82.19 83.61 83.40 1650 95.83 95.87 95.94 1640 95.83 95.90 95.94 1630 95.82 95.89 95.95 1620 95.81 95.90 95.95 1610 95.82 95.90 95.95 1600 95.80 95.89 95.95 1590 95.80 95.90 95.95 1580 95.79 95.88 95.92 1570 95.78 95.87 95.93 1560 95.78 95.88 95.92 1550 95.76 95.85 95.90 1540 95.75 95.84 95.88 1530 95.74 95.82 95.87 1520 95.71 95.81 95.85 1510 95.69 95.79 95.83 1500 95.69 95.78 95.82 1490 95.66 95.75 95.80 1480 95.64 95.73 95.77 1470 95.62 95.71 95.75 1460 95.60 95.69 95.74 1450 95.58 95.68 95.72 1440 95.55 95.66 95.69 1430 95.53 95.63 95.66 1420 95.50 95.61 95.65 1410 95.48 95.59 95.61 1400 95.45 95.56 95.59 1390 95.43 95.54 95.56 1380 95.39 95.51 95.54 1370 95.36 95.49 95.50 1360 95.34 95.46 95.47 1350 95.30 95.41 95.45 1340 95.28 95.39 95.43 1330 95.25 95.35 95.39 1320 95.21 95.31 95.36 1310 95.17 95.29 95.33 1300 95.13 95.24 95.29 1290 95.09 95.21 95.24 1280 95.06 95.17 95.21 1270 95.01 95.11 95.15 1260 94.96 95.09 95.12 1250 94.91 95.03 95.08 1240 94.86 94.98 95.02 1230 94.82 94.94 94.97 1220 94.76 94.88 94.92 1210 94.70 94.81 94.86 1200 94.63 94.76 94.79 1190 94.56 94.70 94.72 1180 94.50 94.64 94.65 1170 94.42 94.55 94.58 1160 94.34 94.48 94.50 1150 94.26 94.39 94.41 1140 94.19 94.32 94.33 1130 94.08 94.21 94.25 1120 93.98 94.13 94.15 1110 93.88 94.01 94.05 1100 93.77 93.90 93.92 1090 93.65 93.78 93.80 1080 93.51 93.65 93.66 1070 93.36 93.52 93.51 1060 93.21 93.35 93.36 1050 93.04 93.19 93.22 1040 92.84 93.00 93.00 1030 92.67 92.79 92.81 1020 92.44 92.56 92.58 1010 92.18 92.33 92.35 1000 91.93 92.07 92.07 990 91.63 91.77 91.77 980 91.30 91.43 91.46 970 90.94 91.09 91.09 960 90.55 90.68 90.69 950 90.08 90.23 90.24