# 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 2023-07-20 (8981 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 90.72 91.23 91.38 998 91.16 91.88 91.07 996 91.32 90.20 91.53 994 90.89 90.32 90.61 992 90.43 91.60 91.21 990 91.29 91.09 91.39 988 90.40 90.50 90.95 986 91.40 90.59 91.55 984 90.55 91.15 91.45 982 90.40 90.38 91.46 980 89.46 91.04 91.40 978 90.26 90.39 90.87 976 91.38 91.40 90.68 974 91.10 90.36 90.84 972 89.77 90.61 91.31 970 89.72 90.73 90.78 968 90.76 90.34 90.56 966 91.13 90.73 91.12 964 90.29 91.13 90.35 962 89.91 88.31 90.83 960 90.19 90.12 90.42 958 90.31 89.39 90.51 956 90.89 90.11 89.57 954 89.34 90.38 89.61 952 89.49 90.27 90.03 950 89.31 89.79 90.14 948 89.48 89.70 89.73 946 89.68 89.33 89.68 944 89.40 89.36 89.78 942 89.51 89.11 89.51 940 88.96 89.45 89.91 938 89.24 89.55 88.77 936 88.52 89.08 89.09 934 88.74 88.68 88.98 932 89.24 88.50 88.62 930 88.60 88.74 89.12 928 88.96 88.59 88.68 926 88.72 88.46 87.40 924 88.00 88.54 88.90 922 88.32 88.38 88.57 920 87.92 88.28 88.21 918 88.06 88.64 88.40 916 87.05 88.52 88.04 914 88.00 87.81 88.15 912 87.63 87.68 87.57 910 87.65 87.72 87.95 908 87.29 87.32 87.41 906 87.03 87.77 87.74 904 86.79 87.74 87.58 902 86.60 86.90 87.27 900 86.73 87.28 86.94 898 87.30 87.08 87.33 896 86.28 87.16 86.66 894 86.24 86.12 86.61 892 86.37 86.31 86.54 890 85.70 86.50 86.71 888 85.86 85.68 86.24 886 85.64 85.79 85.90 884 85.67 86.15 86.34 882 85.21 85.38 85.51 880 85.31 85.48 85.35 878 84.83 85.33 85.77 876 84.99 85.30 85.48 874 84.82 85.22 85.13 872 84.51 84.60 85.01 870 84.40 84.72 84.80 868 84.55 84.43 84.55 866 84.22 84.66 84.47 864 84.27 84.32 84.35 862 84.46 83.89 84.16 860 83.97 83.95 84.22 858 83.57 83.85 84.11 856 83.32 83.80 83.68 854 83.36 83.74 83.67 852 83.67 84.50 83.96 850 83.34 83.76 83.85 848 83.09 83.74 83.66 846 83.20 83.41 83.21 844 82.99 83.36 83.23 842 82.89 83.45 83.31 840 82.88 83.28 83.18 838 83.17 83.17 83.21 836 83.06 82.95 82.75 834 82.70 83.03 83.01 832 82.75 83.05 82.88 830 82.53 83.01 82.79 828 82.35 82.48 82.93 826 82.83 83.06 83.22 824 83.08 82.58 83.31 822 82.48 82.80 83.27 820 82.53 83.33 83.33 818 82.72 83.09 83.31 816 82.71 82.69 82.90 814 83.30 83.10 82.79 812 83.15 82.97 82.77 810 82.70 82.73 82.88 808 82.74 82.97 83.24 806 83.15 82.97 83.11 804 82.94 83.32 82.98 802 82.98 83.23 83.20 800 83.22 83.26 83.42 798 83.32 83.39 83.22 796 83.28 83.32 83.19 794 83.30 83.47 83.29 792 83.56 83.39 83.52 790 83.54 83.46 83.35 788 83.51 83.36 83.73 786 83.73 83.69 83.45 784 83.32 83.71 83.80 782 83.62 83.65 84.05 780 83.94 83.83 84.12 778 83.59 83.80 84.21 776 83.82 84.06 84.07 774 83.87 84.31 84.00 772 83.88 83.75 84.18 770 84.18 83.99 84.21 768 83.99 84.25 84.21 766 83.87 84.28 84.23 764 84.15 84.39 83.99 762 84.19 84.35 84.05 760 84.23 84.49 84.31 758 84.18 84.82 84.38 756 84.40 84.57 84.64 754 84.35 84.53 84.53 752 84.61 84.66 84.48 750 84.58 84.97 84.52 748 84.73 84.78 84.90 746 84.70 84.91 84.84 744 84.56 85.05 84.83 742 84.60 84.59 85.09 740 84.74 84.99 85.06 738 84.99 84.94 85.32 736 84.71 85.05 84.99 734 84.84 84.97 85.12 732 84.94 85.48 85.17 730 85.04 85.06 85.06 728 85.06 85.17 85.54 726 85.15 85.22 85.38 724 85.16 84.90 85.25 722 85.33 85.42 85.39 720 85.09 85.37 85.38 718 85.02 85.28 85.30 716 85.36 85.25 85.30 714 85.30 85.35 85.73 712 85.31 85.67 85.63 710 85.72 85.46 85.60 708 85.56 85.51 85.45 706 85.43 85.61 85.73 704 85.49 85.57 85.41 702 85.29 85.54 85.41 700 85.96 85.79 85.54 698 85.48 85.80 85.75 696 85.36 85.90 85.88 694 85.79 85.77 85.66 692 85.69 85.64 85.67 690 85.65 85.83 85.90 688 85.73 85.89 85.87 686 85.92 85.93 85.72 684 85.64 85.72 86.00 682 85.75 85.83 85.65 680 85.71 85.79 85.71 678 85.72 85.89 85.73 676 85.74 86.11 85.73 674 85.84 85.86 85.79 672 85.84 85.68 85.94 670 85.88 85.77 86.16 668 85.99 85.84 85.95 666 86.03 86.12 86.07 664 85.89 85.98 86.19 662 85.90 85.96 86.05 660 86.17 86.04 86.03 658 86.05 86.20 85.99 656 85.70 86.10 85.87 654 85.95 85.99 85.98 652 85.91 86.17 86.09 650 86.10 86.06 86.02 648 85.92 86.01 86.15 646 86.05 86.17 86.05 644 85.85 86.12 86.39 642 86.05 86.27 85.98 640 86.30 86.04 86.04 638 86.23 86.26 86.21 636 86.03 85.92 86.35 634 86.12 86.17 86.32 632 86.01 86.35 86.19 630 85.93 86.23 86.16 628 86.00 86.30 86.25 626 86.24 85.97 86.24 624 85.99 86.17 86.30 622 86.00 86.01 86.28 620 85.96 86.17 86.19 618 86.05 86.30 86.13 616 86.11 86.27 86.41 614 86.12 86.13 86.02 612 86.08 86.16 86.32 610 86.05 86.21 86.39 608 86.10 86.40 86.30 606 85.91 86.41 86.19 604 86.15 86.25 86.17 602 86.09 86.16 86.40 600 85.80 86.16 86.24 598 86.19 86.36 86.16 596 86.07 86.29 86.24 594 86.27 86.16 86.33 592 86.07 86.22 86.17 590 86.14 86.29 86.15 588 85.90 86.06 86.28 586 86.20 85.97 86.27 584 86.31 86.20 85.76 582 86.20 86.25 86.14 580 86.08 86.02 86.22 578 86.10 86.08 86.16 576 86.09 86.15 86.20 574 85.80 86.14 86.07 572 85.98 86.03 86.25 570 86.04 86.18 86.20 568 86.23 86.17 86.14 566 86.17 86.05 86.14 564 86.05 86.23 86.03 562 85.81 86.14 86.01 560 85.80 86.05 86.22 558 85.98 85.92 86.03 556 86.08 86.05 86.20 554 85.87 86.08 86.06 552 85.97 85.92 85.76 550 85.93 86.03 85.82 548 85.76 85.84 86.17 546 85.84 85.91 85.90 544 85.91 86.19 85.86 542 85.85 86.11 86.10 540 85.96 85.74 86.07 538 85.95 85.91 85.66 536 85.65 85.93 85.75 534 85.80 85.41 85.79 532 85.86 85.68 86.04 530 85.96 85.70 85.62 528 85.84 85.66 85.70 526 85.55 85.83 85.65 524 85.59 85.76 85.67 522 85.35 85.76 85.62 520 85.49 85.68 85.83 518 85.41 85.43 85.59 516 85.45 85.45 85.48 514 85.66 85.63 85.73 512 85.50 85.45 85.48 510 85.46 85.72 85.56 508 85.58 85.47 85.48 506 85.45 85.44 85.32 504 85.37 85.63 85.34 502 85.27 85.49 85.30 500 85.18 85.37 85.06 498 85.18 85.11 85.42 496 85.35 85.30 85.40 494 85.49 85.31 85.52 492 85.05 85.56 84.86 490 84.94 85.38 85.11 488 85.17 85.37 85.10 486 85.09 85.26 85.02 484 84.88 85.09 85.40 482 85.06 85.07 85.16 480 84.85 85.10 85.24 478 85.23 84.96 85.19 476 85.30 84.59 84.82 474 84.67 85.02 84.77 472 84.60 85.09 84.49 470 84.79 84.89 84.68 468 84.85 84.54 84.81 466 84.58 84.73 84.28 464 84.64 84.64 84.49 462 84.23 84.41 84.39 460 84.43 84.32 84.31 458 84.10 84.30 84.36 456 84.34 84.11 84.19 454 84.07 83.96 83.96 452 83.88 83.74 84.17 450 84.03 83.94 83.90 448 83.92 84.02 83.88 446 83.93 83.69 84.16 444 83.78 83.70 83.87 442 83.97 84.04 84.02 440 84.01 83.81 83.92 438 83.87 84.36 83.91 436 84.04 83.81 83.93 434 84.28 83.47 83.80 432 83.99 84.12 83.65 430 83.30 83.43 84.04 428 83.59 83.90 83.46 426 83.68 82.98 83.42 424 83.22 83.69 83.39 422 83.24 83.54 83.94 420 83.20 83.87 83.90 418 83.52 83.02 83.14 416 83.04 83.60 83.35 414 82.84 83.58 82.72 412 82.75 83.57 83.38 410 83.05 83.17 83.08 408 83.08 83.06 83.15 406 83.02 83.01 82.43 404 82.67 82.35 83.27 402 82.03 82.61 83.34 400 82.66 82.24 82.87 398 82.21 82.89 83.37 396 82.28 81.81 83.52 394 83.15 81.74 82.66 392 82.20 82.96 82.54 390 82.63 82.78 82.84 388 81.71 83.26 83.54 386 81.88 82.37 82.38 384 81.82 82.45 81.47 382 81.63 82.43 82.52 380 82.63 83.02 82.50 1650 95.72 95.80 95.81 1640 95.76 95.82 95.83 1630 95.73 95.83 95.84 1620 95.75 95.81 95.83 1610 95.75 95.81 95.82 1600 95.74 95.81 95.83 1590 95.73 95.81 95.80 1580 95.72 95.80 95.81 1570 95.71 95.77 95.79 1560 95.70 95.77 95.79 1550 95.69 95.73 95.77 1540 95.67 95.74 95.75 1530 95.66 95.71 95.75 1520 95.64 95.70 95.72 1510 95.63 95.69 95.71 1500 95.62 95.68 95.69 1490 95.60 95.65 95.67 1480 95.57 95.64 95.66 1470 95.56 95.60 95.64 1460 95.53 95.59 95.61 1450 95.51 95.57 95.60 1440 95.49 95.55 95.59 1430 95.47 95.52 95.55 1420 95.45 95.50 95.54 1410 95.43 95.48 95.52 1400 95.40 95.47 95.51 1390 95.38 95.45 95.48 1380 95.34 95.42 95.45 1370 95.33 95.39 95.43 1360 95.29 95.37 95.41 1350 95.24 95.30 95.34 1340 95.20 95.25 95.30 1330 95.17 95.24 95.26 1320 95.14 95.19 95.22 1310 95.10 95.16 95.20 1300 95.06 95.13 95.15 1290 95.02 95.09 95.12 1280 94.98 95.04 95.09 1270 94.94 95.01 95.04 1260 94.89 94.96 94.98 1250 94.83 94.90 94.93 1240 94.79 94.86 94.89 1230 94.73 94.81 94.84 1220 94.67 94.73 94.79 1210 94.61 94.69 94.72 1200 94.56 94.62 94.66 1190 94.49 94.55 94.60 1180 94.41 94.49 94.53 1170 94.34 94.43 94.46 1160 94.26 94.33 94.38 1150 94.18 94.26 94.29 1140 94.11 94.19 94.22 1130 94.01 94.10 94.14 1120 93.91 93.99 94.03 1110 93.79 93.88 93.92 1100 93.67 93.77 93.80 1090 93.56 93.64 93.68 1080 93.42 93.50 93.56 1070 93.28 93.36 93.40 1060 93.13 93.21 93.26 1050 92.95 93.04 93.08 1040 92.76 92.86 92.89 1030 92.58 92.65 92.70 1020 92.34 92.45 92.48 1010 92.11 92.19 92.23 1000 91.86 91.93 91.97 990 91.53 91.62 91.67 980 91.20 91.28 91.34 970 90.85 90.94 90.98 960 90.45 90.53 90.59 950 90.00 90.10 90.13