# 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 2019-01-30 (7349 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 91.20 91.96 91.42 998 91.26 91.76 91.37 996 91.58 91.85 91.70 994 91.84 90.50 91.96 992 91.26 90.65 91.68 990 91.41 90.85 92.19 988 91.68 91.24 91.62 986 92.02 90.51 90.41 984 91.28 90.26 91.45 982 91.22 90.97 91.32 980 91.26 90.56 91.34 978 90.64 91.21 90.28 976 91.25 90.04 90.28 974 91.21 90.97 90.66 972 90.10 90.13 90.17 970 91.12 90.67 91.05 968 90.72 90.42 90.49 966 90.95 90.60 90.64 964 90.24 90.79 90.37 962 90.03 89.74 90.32 960 90.67 90.61 90.49 958 90.93 90.13 90.19 956 90.18 89.94 90.51 954 90.16 89.66 89.53 952 89.40 89.99 89.74 950 90.21 89.38 89.73 948 90.28 89.72 89.63 946 89.78 89.86 89.58 944 89.90 89.51 90.04 942 89.31 89.32 88.94 940 89.36 89.22 89.87 938 89.52 88.90 89.45 936 89.26 89.27 89.42 934 89.30 89.11 89.43 932 89.01 88.79 89.11 930 89.01 89.38 89.27 928 88.86 88.35 88.67 926 88.69 88.53 88.26 924 89.34 88.72 88.29 922 88.93 88.63 88.33 920 88.73 88.61 88.39 918 88.54 87.98 88.19 916 88.25 87.85 88.53 914 88.26 87.86 88.22 912 88.10 87.94 88.23 910 88.20 87.45 87.87 908 87.91 87.41 87.40 906 87.55 87.66 87.42 904 87.46 87.29 87.28 902 87.59 87.36 87.36 900 87.14 86.93 87.05 898 86.86 86.72 86.89 896 87.26 86.70 86.97 894 86.79 86.66 86.45 892 86.52 86.53 86.30 890 86.43 86.43 86.34 888 86.55 86.31 85.96 886 86.12 86.23 86.30 884 86.11 85.61 86.06 882 85.72 85.47 85.69 880 85.67 85.57 85.56 878 85.49 85.28 85.57 876 85.54 85.21 85.50 874 85.45 85.04 84.94 872 85.06 85.26 85.02 870 84.99 84.42 84.89 868 84.71 84.57 84.73 866 84.92 84.36 84.87 864 84.66 84.52 84.40 862 84.37 84.30 84.25 860 84.23 83.99 84.82 858 84.08 84.04 84.41 856 84.02 84.03 83.97 854 84.04 83.81 84.03 852 83.81 83.97 83.85 850 83.46 83.83 83.60 848 83.69 83.43 83.67 846 83.58 83.21 83.17 844 83.13 83.62 83.26 842 83.25 83.10 83.38 840 83.39 83.12 83.68 838 82.74 83.08 83.48 836 83.23 82.69 83.28 834 83.15 82.82 82.80 832 83.31 82.97 82.91 830 82.78 83.04 83.15 828 83.13 82.79 83.47 826 83.33 82.89 83.22 824 83.11 82.75 83.11 822 83.18 82.85 83.17 820 83.14 82.98 83.19 818 83.04 82.75 83.18 816 83.04 82.67 83.18 814 82.67 82.95 83.15 812 83.09 83.36 83.15 810 83.09 82.85 82.95 808 83.14 83.36 83.14 806 83.54 83.45 83.08 804 83.31 83.18 83.52 802 83.21 83.21 83.22 800 83.21 83.46 83.38 798 83.53 83.34 83.42 796 83.57 83.28 83.71 794 83.69 83.72 83.40 792 83.62 83.63 83.59 790 83.56 83.80 83.64 788 83.63 83.46 83.36 786 83.94 83.91 83.83 784 83.82 83.94 83.66 782 83.86 83.81 84.07 780 83.92 83.90 83.80 778 84.04 84.14 84.13 776 84.24 84.25 84.52 774 84.43 84.48 84.36 772 84.44 84.66 84.81 770 84.47 84.24 84.64 768 84.66 84.57 84.62 766 84.41 84.82 84.37 764 84.57 84.45 84.63 762 85.02 84.53 84.99 760 84.82 84.51 84.82 758 84.85 84.62 84.75 756 84.90 84.71 84.92 754 85.26 84.82 85.09 752 84.94 85.08 85.14 750 84.96 85.05 85.15 748 85.32 85.19 85.38 746 85.30 85.26 85.45 744 85.56 85.18 85.24 742 85.54 85.29 85.40 740 85.46 85.10 85.53 738 85.61 85.28 85.49 736 85.61 85.52 85.82 734 85.54 85.65 85.69 732 85.66 85.84 85.66 730 85.87 85.65 85.84 728 85.54 85.63 85.77 726 85.76 85.67 85.77 724 85.78 85.75 85.93 722 85.94 85.66 85.92 720 85.97 86.00 85.86 718 86.01 85.93 86.12 716 85.98 85.94 86.01 714 86.16 85.84 86.17 712 86.25 86.04 86.33 710 86.30 86.05 86.27 708 86.31 86.10 86.39 706 86.43 85.99 86.22 704 86.38 86.16 86.18 702 86.21 86.18 86.33 700 86.39 86.22 86.26 698 86.50 86.37 86.48 696 86.54 86.29 86.54 694 86.60 86.17 86.70 692 86.40 86.23 86.50 690 86.64 86.47 86.55 688 86.59 86.51 86.75 686 86.60 86.53 86.65 684 86.66 86.45 86.68 682 86.43 86.62 86.65 680 86.68 86.54 86.43 678 86.51 86.66 86.71 676 86.64 86.56 86.79 674 86.83 86.51 86.90 672 86.69 86.43 86.87 670 86.85 86.71 86.88 668 86.91 86.69 87.00 666 86.93 86.68 86.88 664 86.93 86.76 86.93 662 86.82 86.85 87.00 660 86.84 86.81 87.21 658 86.90 86.71 87.00 656 86.95 86.69 87.31 654 87.03 86.90 87.13 652 86.92 86.87 87.08 650 86.89 86.95 86.99 648 86.97 86.90 87.28 646 86.99 87.15 86.99 644 87.05 87.15 86.96 642 87.03 86.84 87.09 640 87.11 86.84 87.09 638 87.36 87.08 87.33 636 87.21 86.90 87.33 634 86.96 87.09 87.26 632 87.12 87.16 87.23 630 87.17 87.15 87.27 628 87.29 87.20 87.40 626 87.29 87.20 87.35 624 87.38 87.08 87.28 622 87.17 87.21 87.54 620 87.12 87.23 87.36 618 87.32 87.11 87.35 616 87.27 87.25 87.22 614 87.27 87.13 87.25 612 87.28 86.98 87.51 610 87.37 87.27 87.36 608 87.27 87.06 87.24 606 87.29 87.11 87.47 604 87.26 87.22 87.43 602 87.18 87.24 87.30 600 87.39 87.10 87.29 598 87.47 87.28 87.28 596 87.30 87.27 87.23 594 87.26 87.46 87.12 592 87.28 87.32 87.26 590 87.32 87.27 87.55 588 87.43 87.33 87.20 586 87.44 87.25 87.24 584 87.17 87.33 87.49 582 87.32 87.21 87.54 580 87.35 87.29 87.28 578 87.08 87.11 87.12 576 87.20 87.25 87.26 574 87.07 87.24 87.37 572 87.44 87.33 87.41 570 87.40 87.30 87.43 568 87.30 87.35 87.51 566 87.22 87.23 87.51 564 87.30 87.35 87.34 562 87.31 87.23 87.47 560 87.29 87.27 87.38 558 87.34 87.33 87.43 556 87.26 87.26 87.28 554 87.16 87.23 87.34 552 87.28 87.05 87.16 550 87.02 87.34 87.26 548 87.06 86.97 87.33 546 87.11 87.09 87.17 544 87.22 87.34 87.17 542 87.12 86.91 87.32 540 87.04 87.31 87.30 538 87.30 87.01 87.09 536 87.08 87.15 87.16 534 87.17 87.27 87.32 532 87.13 87.39 87.14 530 87.29 87.12 87.23 528 87.07 87.09 87.21 526 87.40 87.12 87.24 524 87.20 87.11 87.16 522 87.06 87.11 87.31 520 87.15 87.29 87.28 518 87.08 87.00 87.02 516 87.07 87.36 87.02 514 87.07 87.09 87.02 512 87.04 87.02 87.18 510 87.22 87.08 86.99 508 87.15 87.05 87.03 506 87.05 87.03 87.06 504 87.05 86.90 87.05 502 87.03 86.99 86.96 500 86.76 86.94 86.87 498 86.96 87.10 87.01 496 86.80 86.95 87.13 494 86.98 87.07 87.16 492 87.03 86.73 87.04 490 87.00 86.92 86.97 488 86.66 86.74 86.99 486 86.81 86.94 86.83 484 86.80 86.54 87.13 482 86.87 86.75 86.87 480 86.92 86.60 86.81 478 86.75 86.57 86.92 476 86.51 86.60 86.98 474 86.55 86.67 86.81 472 86.58 86.51 86.61 470 86.67 86.51 86.67 468 86.53 86.50 86.81 466 86.51 86.72 86.94 464 86.73 86.90 86.67 462 86.64 86.77 86.65 460 86.48 86.65 86.58 458 86.43 86.39 86.52 456 86.55 86.46 86.43 454 86.17 86.53 86.35 452 86.44 86.32 86.42 450 86.32 86.30 86.16 448 86.28 86.23 86.20 446 86.51 86.38 86.36 444 86.61 86.20 86.47 442 86.07 86.02 86.59 440 86.42 86.44 86.74 438 86.01 86.16 86.26 436 85.90 85.69 85.70 434 86.07 86.39 86.06 432 85.57 86.03 86.46 430 85.84 86.20 86.42 428 86.37 86.04 86.40 426 86.05 86.02 86.16 424 85.85 85.84 85.89 422 85.82 85.84 85.78 420 85.75 85.90 85.84 418 85.52 85.94 85.72 416 85.96 86.05 85.85 414 85.79 85.74 85.71 412 85.46 85.93 85.69 410 85.57 85.87 85.83 408 85.68 85.80 85.56 406 85.66 85.15 85.71 404 85.32 85.57 85.10 402 85.13 85.93 85.41 400 85.52 85.05 85.51 398 85.33 85.19 86.16 396 84.71 85.75 85.79 394 85.71 84.87 85.21 392 85.27 85.42 85.03 390 85.25 84.49 85.30 388 84.96 84.62 84.99 386 85.08 84.62 85.44 384 85.87 85.20 84.74 382 85.02 85.34 86.21 380 85.27 84.59 84.68 1650 95.74 95.54 95.70 1640 95.75 95.54 95.73 1630 95.75 95.55 95.73 1620 95.76 95.56 95.73 1610 95.76 95.56 95.74 1600 95.75 95.55 95.72 1590 95.76 95.55 95.72 1580 95.74 95.54 95.72 1570 95.73 95.53 95.71 1560 95.73 95.53 95.70 1550 95.71 95.51 95.69 1540 95.70 95.51 95.68 1530 95.69 95.49 95.66 1520 95.68 95.48 95.65 1510 95.67 95.47 95.64 1500 95.65 95.46 95.62 1490 95.62 95.44 95.60 1480 95.61 95.42 95.59 1470 95.60 95.40 95.57 1460 95.57 95.38 95.54 1450 95.55 95.36 95.52 1440 95.52 95.34 95.50 1430 95.50 95.32 95.47 1420 95.47 95.29 95.46 1410 95.46 95.28 95.44 1400 95.43 95.26 95.42 1390 95.42 95.24 95.40 1380 95.38 95.20 95.36 1370 95.33 95.15 95.32 1360 95.30 95.11 95.27 1350 95.26 95.08 95.24 1340 95.23 95.05 95.21 1330 95.20 95.03 95.18 1320 95.17 94.99 95.15 1310 95.14 94.96 95.11 1300 95.10 94.92 95.08 1290 95.07 94.89 95.03 1280 95.02 94.85 95.00 1270 94.99 94.81 94.97 1260 94.95 94.76 94.93 1250 94.91 94.72 94.88 1240 94.86 94.68 94.83 1230 94.80 94.62 94.78 1220 94.76 94.58 94.73 1210 94.71 94.53 94.68 1200 94.65 94.46 94.62 1190 94.58 94.39 94.55 1180 94.52 94.33 94.49 1170 94.45 94.27 94.42 1160 94.39 94.20 94.35 1150 94.32 94.13 94.28 1140 94.24 94.05 94.20 1130 94.15 93.96 94.12 1120 94.06 93.87 94.03 1110 93.96 93.78 93.93 1100 93.86 93.67 93.82 1090 93.74 93.56 93.70 1080 93.60 93.43 93.57 1070 93.48 93.29 93.44 1060 93.32 93.15 93.29 1050 93.17 92.99 93.13 1040 92.99 92.82 92.95 1030 92.80 92.61 92.77 1020 92.59 92.41 92.55 1010 92.36 92.18 92.32 1000 92.10 91.94 92.07 990 91.83 91.66 91.78 980 91.51 91.34 91.46 970 91.16 90.99 91.11 960 90.77 90.62 90.72 950 90.33 90.17 90.28