# Subaru Telescope Primary Mirror In-Situ Measured Reflectivity # Coated with Aluminum on 2017-10-20 # Opened the vacuum chamber on 2017-11-21 # Measured with Subaru Portable Spectrophotometer (SPS) on 2020-12-09 (1146 days after) # Measured four times at around the position 3 # Data between 950 nm and 1650 nm are also available (SPS-XWW). # Contact: Hirofumi Okita (okita14@naoj.org) # # Wavelength (nm) Pos.3 #1 Pos.3 #2 Pos.3 #3 Pos.3 #4 1000 87.52 88.13 87.39 86.10 998 87.43 87.82 87.28 87.44 996 87.63 88.67 87.07 86.78 994 87.40 86.88 87.24 86.22 992 87.33 87.55 87.30 86.82 990 86.84 86.83 87.28 86.07 988 87.03 87.42 88.20 86.64 986 87.17 87.34 87.33 86.69 984 87.32 87.90 87.44 87.35 982 87.11 87.58 87.22 85.89 980 87.05 88.36 87.24 86.97 978 86.69 87.46 87.80 86.19 976 87.05 87.59 87.21 86.26 974 87.28 87.64 87.95 87.22 972 86.69 87.20 87.27 86.10 970 87.64 87.44 86.76 85.92 968 86.33 87.96 87.08 85.97 966 86.84 86.50 86.85 86.07 964 86.50 87.03 87.08 86.53 962 86.36 86.99 86.28 86.59 960 86.64 86.61 86.73 86.35 958 86.51 87.18 86.88 86.14 956 86.51 86.64 86.44 86.36 954 86.19 86.61 86.78 85.77 952 86.26 86.94 86.07 85.60 950 86.28 86.69 86.14 85.91 948 85.92 86.42 86.19 85.83 946 85.56 86.36 86.38 85.52 944 86.10 86.75 86.35 85.39 942 85.93 86.31 86.04 85.57 940 85.93 86.35 85.89 85.61 938 85.56 86.04 85.79 85.69 936 85.85 86.12 85.59 84.76 934 85.56 86.26 85.71 84.71 932 85.31 85.79 85.13 84.81 930 84.84 85.43 85.44 84.23 928 85.00 85.10 85.17 84.22 926 84.97 85.47 85.30 84.47 924 84.95 85.06 85.14 84.22 922 84.84 85.41 85.02 84.12 920 84.37 85.25 84.89 84.19 918 84.65 84.93 84.60 83.58 916 84.59 84.84 84.27 83.49 914 84.34 84.67 84.51 83.70 912 83.75 84.34 84.18 83.73 910 84.07 84.44 84.47 83.64 908 84.09 84.18 83.95 83.36 906 83.33 84.50 84.07 83.84 904 83.36 83.91 83.74 82.82 902 83.19 83.51 83.45 83.12 900 82.78 83.57 83.80 83.08 898 82.97 83.69 83.44 82.82 896 82.56 83.69 83.02 82.62 894 82.77 83.10 82.96 82.39 892 82.83 83.24 82.99 82.54 890 82.39 82.71 82.83 82.07 888 82.31 82.53 82.76 81.96 886 82.32 82.40 82.62 81.35 884 82.05 82.37 82.52 81.96 882 82.16 82.39 82.25 81.50 880 81.78 82.17 81.86 81.23 878 81.67 81.96 81.71 81.28 876 81.58 82.10 81.77 81.24 874 81.08 81.41 81.56 80.85 872 81.31 81.83 81.14 80.92 870 80.82 81.38 81.01 80.86 868 81.19 81.55 81.00 80.62 866 80.56 81.13 81.07 80.32 864 80.83 81.10 80.63 79.94 862 80.54 80.62 80.41 80.11 860 80.15 80.80 80.47 80.03 858 80.23 80.78 80.48 79.97 856 79.77 80.45 80.33 79.67 854 79.84 80.16 80.09 79.65 852 79.85 80.18 79.99 78.97 850 79.71 79.93 79.67 79.10 848 79.41 79.85 79.60 79.19 846 79.63 80.07 79.91 79.35 844 79.40 79.75 79.31 78.95 842 79.52 79.87 79.51 78.75 840 79.05 79.39 79.06 78.79 838 79.26 79.71 79.29 78.71 836 79.19 79.63 79.49 78.84 834 78.91 79.41 79.37 78.61 832 78.97 79.27 79.20 78.69 830 79.01 79.39 78.94 78.37 828 78.69 79.10 79.13 78.69 826 78.64 79.43 79.22 78.51 824 78.89 79.25 79.23 78.33 822 78.86 79.12 78.96 78.76 820 78.78 79.41 79.29 78.61 818 78.57 79.26 79.11 78.53 816 78.85 79.44 79.22 78.57 814 78.29 79.55 79.09 78.54 812 78.97 79.63 79.39 78.56 810 79.22 79.33 79.34 78.64 808 78.67 79.67 79.14 78.70 806 78.85 79.51 79.23 78.60 804 78.93 79.42 79.18 78.65 802 79.28 79.61 79.16 78.51 800 79.11 79.47 79.21 78.73 798 79.00 79.70 79.56 78.64 796 79.37 79.46 79.18 78.77 794 79.16 79.78 79.28 79.03 792 79.24 79.75 79.53 79.09 790 79.35 79.72 79.73 78.90 788 79.41 79.97 79.85 79.20 786 79.37 79.71 79.61 79.03 784 79.52 80.03 79.78 79.24 782 79.80 80.09 79.93 79.17 780 79.73 79.83 79.74 79.46 778 79.51 80.10 80.23 79.85 776 79.60 80.38 80.22 79.56 774 79.81 80.44 80.28 79.60 772 79.83 80.46 80.12 79.72 770 79.87 80.57 80.07 79.66 768 79.93 80.53 80.40 80.00 766 79.79 80.58 80.27 79.71 764 80.34 80.71 80.02 79.89 762 80.09 80.86 80.45 79.97 760 80.09 80.45 80.43 79.98 758 80.36 80.85 80.91 79.93 756 80.53 80.76 80.56 80.40 754 80.63 81.12 80.85 79.95 752 80.31 81.04 80.93 80.14 750 80.90 81.06 80.71 80.30 748 80.66 80.80 80.92 80.23 746 80.54 81.04 80.82 80.29 744 80.72 80.99 80.97 80.33 742 80.57 81.18 81.05 80.57 740 80.77 81.05 81.18 80.32 738 80.66 81.11 81.10 80.38 736 80.88 81.42 81.25 80.60 734 80.93 81.44 81.07 80.70 732 80.95 81.43 81.23 80.59 730 80.85 81.22 81.33 80.53 728 80.84 81.53 81.35 80.75 726 80.82 81.56 81.24 80.59 724 81.05 81.53 81.30 80.79 722 81.10 81.71 81.49 80.66 720 81.13 81.52 81.30 80.95 718 81.09 81.76 81.38 80.81 716 81.27 81.67 81.51 80.82 714 81.29 81.81 81.59 80.86 712 81.28 81.79 81.43 80.94 710 81.39 81.80 81.65 80.92 708 81.19 81.77 81.55 81.10 706 81.19 81.62 81.50 81.07 704 81.22 81.90 81.72 80.95 702 81.19 81.91 81.75 81.02 700 81.27 81.96 81.31 81.09 698 81.26 81.91 81.75 81.14 696 81.35 82.08 81.70 81.09 694 81.67 82.07 81.67 81.21 692 81.49 81.97 81.77 81.02 690 81.39 81.98 81.78 81.22 688 81.50 81.90 81.97 81.37 686 81.63 81.91 82.00 81.37 684 81.64 82.06 81.91 81.34 682 81.59 82.07 81.71 81.35 680 81.65 81.90 81.97 81.32 678 81.56 82.22 82.10 81.23 676 81.66 82.15 81.90 81.24 674 81.32 82.04 82.09 81.32 672 81.58 82.08 82.05 81.47 670 81.68 82.16 82.03 81.37 668 81.46 82.19 81.89 81.34 666 81.69 82.18 82.02 81.26 664 81.85 82.30 82.04 81.48 662 81.73 82.29 82.12 81.60 660 81.46 82.10 82.00 81.47 658 81.61 82.13 81.93 81.40 656 81.60 82.24 82.16 81.37 654 81.69 82.24 82.04 81.38 652 81.66 82.20 82.08 81.44 650 81.77 82.19 81.98 81.55 648 81.58 82.14 82.12 81.39 646 81.77 82.22 82.13 81.42 644 81.63 82.25 82.11 81.55 642 81.57 82.28 82.03 81.48 640 81.64 82.27 82.01 81.56 638 81.83 82.36 82.06 81.60 636 81.88 82.31 82.10 81.43 634 81.87 82.16 82.12 81.60 632 81.80 82.21 82.18 81.44 630 81.81 82.46 82.00 81.45 628 81.73 82.31 82.04 81.74 626 81.67 82.53 82.10 81.59 624 81.66 82.30 82.35 81.31 622 81.65 82.32 82.24 81.45 620 81.54 82.47 82.10 81.59 618 81.66 82.34 82.21 81.54 616 81.86 82.32 82.00 81.49 614 81.83 82.32 82.21 81.26 612 81.74 82.32 82.10 81.56 610 81.66 82.47 82.33 81.58 608 81.59 82.30 82.01 81.55 606 81.78 82.49 81.99 81.64 604 81.67 82.38 82.01 81.49 602 81.70 82.35 82.33 81.47 600 81.69 82.35 82.25 81.35 598 81.60 82.24 82.15 81.46 596 81.93 82.19 82.17 81.63 594 81.75 82.17 81.94 81.62 592 81.60 82.21 82.30 81.62 590 81.70 82.24 82.20 81.64 588 81.58 82.21 82.16 81.59 586 81.88 82.28 82.24 81.55 584 81.42 82.37 82.19 81.56 582 81.77 82.35 82.19 81.45 580 81.66 82.19 82.15 81.62 578 81.58 82.23 82.12 81.53 576 81.59 82.23 82.14 81.49 574 81.72 82.23 82.15 81.58 572 81.71 82.51 82.13 81.48 570 81.73 82.31 82.07 81.55 568 81.67 82.18 82.04 81.51 566 81.50 82.16 81.99 81.46 564 81.51 82.04 82.00 81.60 562 81.49 82.29 82.21 81.36 560 81.72 82.11 82.26 81.40 558 81.71 82.27 82.27 81.43 556 81.53 82.15 82.07 81.44 554 81.56 82.21 82.19 81.33 552 81.73 82.34 82.22 81.51 550 81.56 82.21 82.12 81.41 548 81.64 81.97 82.09 81.38 546 81.44 82.04 82.00 81.26 544 81.40 82.23 81.80 81.25 542 81.42 82.10 82.02 81.33 540 81.43 81.97 82.07 81.14 538 81.44 82.11 81.96 81.26 536 81.24 81.89 82.22 81.28 534 81.26 82.07 81.87 81.31 532 81.46 82.02 82.00 81.23 530 81.33 81.90 81.97 81.23 528 81.09 81.85 81.99 81.24 526 81.15 82.05 81.83 81.32 524 81.03 81.83 81.90 81.11 522 81.25 81.81 81.69 81.17 520 81.22 81.78 81.79 81.18 518 81.19 81.99 81.81 81.25 516 81.41 81.92 81.82 81.03 514 81.28 81.66 81.73 80.97 512 81.05 81.87 81.90 81.12 510 81.22 81.86 81.60 81.10 508 80.97 81.81 81.69 81.19 506 81.05 81.84 81.64 81.04 504 81.10 81.71 81.60 80.98 502 81.09 81.55 81.60 80.99 500 81.08 81.86 81.49 80.92 498 80.92 81.72 81.82 80.84 496 80.90 81.53 81.62 80.96 494 80.88 81.49 81.55 80.73 492 80.97 81.69 81.48 80.91 490 80.94 81.63 81.69 80.77 488 80.74 81.24 81.83 80.77 486 81.04 81.58 81.57 80.70 484 80.68 81.32 81.65 80.48 482 80.78 81.57 81.35 80.83 480 80.80 81.34 81.38 80.75 478 80.53 81.35 81.40 80.63 476 80.68 81.49 81.30 80.66 474 80.51 81.11 81.30 80.43 472 80.62 81.28 81.24 80.35 470 80.46 81.41 81.15 80.85 468 80.36 81.31 81.26 80.70 466 80.48 81.16 81.04 80.50 464 80.67 80.99 80.83 80.44 462 80.62 81.10 80.85 80.14 460 80.48 81.19 81.02 80.22 458 80.40 81.11 80.94 80.22 456 80.25 80.90 80.99 80.16 454 80.24 80.86 80.95 80.17 452 80.18 81.02 81.09 80.20 450 80.37 80.81 81.38 80.27 448 80.25 80.76 80.86 80.47 446 80.45 80.79 80.85 80.19 444 79.91 80.34 80.62 79.96 442 80.19 80.81 80.52 80.02 440 80.25 80.43 80.80 80.09 438 80.13 80.35 81.01 80.24 436 79.56 79.91 80.39 79.70 434 79.91 80.21 80.48 79.87 432 79.53 80.58 80.49 79.79 430 79.95 80.33 80.40 80.15 428 79.96 80.02 80.50 79.82 426 79.73 80.63 80.58 79.76 424 79.58 80.39 80.44 79.74 422 79.21 80.37 80.62 79.81 420 79.71 80.05 80.72 79.52 418 79.85 80.16 80.19 80.02 416 79.93 80.18 80.22 79.50 414 79.59 79.98 80.98 79.37 412 79.50 80.14 80.16 79.83 410 79.62 79.45 80.14 79.42 408 79.42 80.09 79.63 78.97 406 79.69 80.00 80.13 79.43 404 79.28 80.07 80.23 78.66 402 79.28 79.94 80.57 78.57 400 79.29 79.91 79.96 79.38 398 79.18 79.54 80.72 79.28 396 79.08 78.96 80.26 79.54 394 78.52 79.17 79.62 79.32 392 78.90 79.93 79.88 78.99 390 79.95 79.80 79.49 78.86 388 78.77 79.69 79.54 78.88 386 78.63 78.67 79.61 78.61 384 78.95 78.76 78.43 78.77 382 78.00 80.11 79.90 78.85 380 78.94 79.12 79.28 78.72 1650 92.63 93.02 92.76 92.27 1640 92.64 93.03 92.76 92.28 1630 92.66 93.03 92.77 92.28 1620 92.66 93.04 92.77 92.29 1610 92.66 93.03 92.78 92.28 1600 92.65 93.03 92.76 92.29 1590 92.64 93.02 92.75 92.27 1580 92.64 93.01 92.73 92.26 1570 92.61 93.00 92.72 92.24 1560 92.61 92.99 92.70 92.23 1550 92.59 92.97 92.69 92.21 1540 92.58 92.95 92.68 92.19 1530 92.56 92.94 92.65 92.16 1520 92.54 92.91 92.64 92.14 1510 92.52 92.90 92.61 92.12 1500 92.50 92.88 92.59 92.10 1490 92.47 92.87 92.57 92.07 1480 92.45 92.84 92.55 92.05 1470 92.42 92.82 92.52 92.02 1460 92.41 92.80 92.50 92.00 1450 92.38 92.77 92.48 91.97 1440 92.36 92.75 92.45 91.95 1430 92.32 92.71 92.42 91.93 1420 92.30 92.69 92.38 91.88 1410 92.27 92.66 92.36 91.86 1400 92.23 92.63 92.32 91.82 1390 92.20 92.60 92.29 91.80 1380 92.17 92.56 92.27 91.76 1370 92.14 92.54 92.22 91.72 1360 92.10 92.51 92.19 91.69 1350 92.06 92.46 92.14 91.65 1340 92.02 92.42 92.11 91.61 1330 91.99 92.38 92.07 91.57 1320 91.94 92.35 92.02 91.51 1310 91.90 92.30 91.99 91.49 1300 91.86 92.26 91.93 91.43 1290 91.81 92.21 91.89 91.39 1280 91.77 92.17 91.84 91.34 1270 91.71 92.12 91.80 91.29 1260 91.66 92.06 91.74 91.23 1250 91.61 92.02 91.68 91.19 1240 91.56 91.96 91.65 91.13 1230 91.49 91.90 91.58 91.07 1220 91.42 91.84 91.52 91.00 1210 91.36 91.77 91.45 90.94 1200 91.30 91.71 91.38 90.87 1190 91.22 91.64 91.32 90.79 1180 91.14 91.56 91.24 90.72 1170 91.07 91.48 91.15 90.64 1160 90.98 91.39 91.07 90.55 1150 90.88 91.30 90.99 90.46 1140 90.79 91.22 90.89 90.37 1130 90.69 91.11 90.78 90.27 1120 90.58 91.01 90.68 90.16 1110 90.47 90.90 90.57 90.04 1100 90.34 90.76 90.44 89.91 1090 90.20 90.63 90.30 89.79 1080 90.06 90.49 90.17 89.64 1070 89.91 90.34 90.02 89.49 1060 89.75 90.19 89.86 89.33 1050 89.56 90.01 89.66 89.15 1040 89.37 89.81 89.48 88.95 1030 89.16 89.61 89.28 88.74 1020 88.94 89.38 89.05 88.52 1010 88.68 89.12 88.81 88.27 1000 88.42 88.84 88.53 88.01 990 88.11 88.56 88.23 87.71 980 87.77 88.22 87.91 87.39 970 87.41 87.86 87.53 87.02 960 87.02 87.46 87.15 86.61 950 86.56 87.00 86.70 86.18