# 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 2021-01-21 (1189 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 87.39 87.92 86.87 87.53 998 86.54 86.36 88.31 87.15 996 87.70 87.24 87.18 88.14 994 87.04 87.33 86.78 87.70 992 86.02 87.39 86.96 87.12 990 86.38 88.02 86.87 87.86 988 87.25 86.83 86.60 87.80 986 87.04 87.18 87.37 87.27 984 86.85 86.95 85.92 86.58 982 86.94 87.53 86.99 87.35 980 86.41 87.47 86.78 87.40 978 86.52 87.56 87.09 87.03 976 86.81 87.76 87.16 86.91 974 86.21 86.77 86.63 86.90 972 86.09 87.30 86.94 87.12 970 86.02 87.03 86.65 86.96 968 86.25 87.08 86.37 86.66 966 86.79 87.10 85.98 87.58 964 85.84 86.59 86.44 86.81 962 86.10 86.60 86.54 86.84 960 86.18 87.30 85.86 86.20 958 85.66 86.47 85.78 86.38 956 85.26 86.10 86.31 86.52 954 86.02 86.53 86.03 86.26 952 85.89 86.11 85.92 86.61 950 85.59 85.97 86.33 86.40 948 85.67 85.57 85.43 86.19 946 85.61 86.11 85.69 86.18 944 84.97 86.12 85.77 85.51 942 85.48 85.73 85.37 85.92 940 85.08 85.58 85.44 85.46 938 84.98 85.55 85.88 85.56 936 85.09 85.33 85.11 85.31 934 84.74 85.10 85.38 85.53 932 84.69 85.02 84.82 85.48 930 84.39 85.23 85.01 85.29 928 84.50 85.27 85.01 84.90 926 84.51 85.02 84.58 84.90 924 84.58 85.41 84.67 85.01 922 84.70 84.61 84.75 85.19 920 84.50 84.84 84.64 84.57 918 84.10 84.97 84.34 84.69 916 83.88 85.31 84.01 84.39 914 83.56 84.61 84.13 83.97 912 83.85 84.14 84.41 83.88 910 83.82 83.95 83.85 84.47 908 83.57 83.88 83.41 84.00 906 83.31 83.26 83.15 83.85 904 83.31 83.87 82.90 83.47 902 82.64 84.02 83.12 83.39 900 82.54 83.34 83.01 83.28 898 83.14 83.30 82.86 83.43 896 82.40 83.17 82.70 82.80 894 82.16 83.10 82.32 82.54 892 82.33 82.59 82.41 82.88 890 82.37 82.58 82.55 82.96 888 82.34 82.37 81.54 82.43 886 82.15 82.03 81.66 82.60 884 81.57 82.40 82.17 82.45 882 81.54 82.17 81.71 82.02 880 81.02 81.47 81.64 81.77 878 81.35 81.57 81.27 81.69 876 81.09 81.58 81.40 81.82 874 80.62 81.45 80.62 81.44 872 80.65 81.07 80.76 81.50 870 80.46 81.14 80.81 81.24 868 80.57 81.22 80.41 81.07 866 80.11 80.89 80.50 81.10 864 80.22 80.66 80.29 80.70 862 80.29 80.68 80.28 80.44 860 80.06 80.38 80.07 80.31 858 79.63 80.36 79.84 80.29 856 79.47 79.95 79.78 80.11 854 79.41 80.20 79.64 79.72 852 79.05 80.17 79.15 79.77 850 79.10 79.62 79.14 79.58 848 78.93 79.93 79.21 79.73 846 79.21 79.55 79.32 79.38 844 79.21 79.68 79.22 79.42 842 78.77 79.53 78.72 79.41 840 78.96 79.27 78.65 79.42 838 78.45 79.15 78.55 78.89 836 78.90 79.15 78.36 79.09 834 78.69 79.16 78.31 78.92 832 78.82 78.99 79.18 79.19 830 78.48 79.09 78.66 78.71 828 78.79 79.31 78.62 78.79 826 78.79 79.01 79.01 79.24 824 78.74 79.19 78.41 79.24 822 78.49 79.05 78.61 79.57 820 78.48 78.85 78.54 79.32 818 78.77 79.20 78.52 78.99 816 78.40 79.09 78.65 78.92 814 78.74 79.37 78.27 79.02 812 78.54 79.05 78.54 79.25 810 78.53 79.15 78.47 78.95 808 78.43 79.10 78.41 78.97 806 78.50 79.21 78.78 79.22 804 78.85 79.41 78.36 78.89 802 78.81 79.20 78.40 79.31 800 78.57 79.24 78.57 79.21 798 78.58 79.37 78.61 79.25 796 78.70 79.50 78.83 79.36 794 78.79 79.57 79.04 79.44 792 79.11 79.68 78.90 79.33 790 79.20 79.39 79.34 79.61 788 79.13 79.93 79.16 79.41 786 79.18 79.75 79.24 79.73 784 79.14 79.45 79.29 79.62 782 79.34 79.91 79.57 79.63 780 79.41 79.94 79.37 79.79 778 79.20 80.37 79.55 80.11 776 79.44 80.10 79.53 80.15 774 79.73 80.08 79.54 80.26 772 79.75 80.33 79.80 80.04 770 79.72 80.50 79.77 80.59 768 79.55 80.23 80.02 80.46 766 80.06 80.35 79.98 80.31 764 80.12 80.61 79.83 80.49 762 79.95 80.39 80.23 80.74 760 80.04 80.47 80.20 80.61 758 80.24 80.69 79.98 80.66 756 80.24 81.00 80.07 80.53 754 79.87 80.67 80.22 80.88 752 80.48 80.96 80.44 80.99 750 80.26 80.93 80.27 80.71 748 80.37 80.95 80.41 80.64 746 80.54 81.24 80.37 81.02 744 80.51 81.24 80.54 81.05 742 80.65 81.55 80.65 80.87 740 80.38 81.19 80.57 81.13 738 80.71 81.17 80.71 81.12 736 80.71 81.23 80.59 80.96 734 80.77 81.26 80.71 81.14 732 80.54 81.32 80.82 81.33 730 80.86 81.45 81.03 81.38 728 81.02 81.21 80.99 81.45 726 80.99 81.70 80.96 81.28 724 81.05 81.46 80.82 81.43 722 81.19 81.63 81.05 81.44 720 81.02 81.70 81.04 81.67 718 81.15 81.62 80.88 81.53 716 81.10 81.59 80.99 81.73 714 81.36 81.77 81.16 81.48 712 81.28 81.76 80.97 81.32 710 81.34 81.88 81.17 81.68 708 81.23 81.85 81.07 81.59 706 81.32 82.20 81.07 81.70 704 81.19 81.84 81.39 81.62 702 81.41 82.04 81.08 81.77 700 81.38 82.00 81.30 81.67 698 81.28 82.01 81.19 81.80 696 81.36 82.03 81.51 81.86 694 81.43 82.00 81.43 81.84 692 81.58 82.00 81.41 81.90 690 81.45 82.07 81.33 81.86 688 81.35 82.07 81.51 81.98 686 81.40 82.03 81.28 81.89 684 81.59 82.20 81.62 81.95 682 81.48 82.23 81.53 81.92 680 81.67 82.30 81.70 82.00 678 81.59 82.30 81.56 82.05 676 81.54 82.18 81.69 82.20 674 81.61 82.23 81.72 82.17 672 81.74 82.41 81.53 82.04 670 81.66 82.37 81.68 82.13 668 81.65 82.25 81.65 82.19 666 81.79 82.35 81.60 82.05 664 81.61 82.45 81.68 82.02 662 81.86 82.26 81.76 82.13 660 81.79 82.40 81.75 82.20 658 81.82 82.64 81.81 82.18 656 81.81 82.29 81.72 82.25 654 81.80 82.46 81.65 82.20 652 81.77 82.51 81.69 82.20 650 81.90 82.45 81.86 82.20 648 82.05 82.64 81.95 82.28 646 81.90 82.52 81.86 82.34 644 81.82 82.50 81.84 82.22 642 81.89 82.56 81.82 82.27 640 81.78 82.54 81.75 82.33 638 82.02 82.43 81.79 82.21 636 81.98 82.57 81.81 82.24 634 81.95 82.48 81.87 82.19 632 81.96 82.55 82.01 82.32 630 82.01 82.71 81.81 82.10 628 81.94 82.69 81.89 82.28 626 81.94 82.53 81.74 82.36 624 81.94 82.68 81.87 82.14 622 82.04 82.62 81.87 82.09 620 81.82 82.57 81.90 82.41 618 81.93 82.70 81.86 82.32 616 82.09 82.59 81.73 82.50 614 81.97 82.63 81.90 82.46 612 81.96 82.44 81.79 82.29 610 81.98 82.82 81.92 82.31 608 82.00 82.57 81.98 82.36 606 81.97 82.63 81.76 82.40 604 82.14 82.70 81.64 82.45 602 81.94 82.53 81.96 82.44 600 82.03 82.48 81.72 82.14 598 81.91 82.75 81.89 82.30 596 82.07 82.61 81.62 82.16 594 81.96 82.65 81.84 82.36 592 81.87 82.51 81.89 82.29 590 82.02 82.64 81.77 82.25 588 81.92 82.60 81.99 82.44 586 82.06 82.62 81.93 82.21 584 82.01 82.74 81.86 82.32 582 82.05 82.77 81.98 82.32 580 82.07 82.57 81.90 82.19 578 82.04 82.63 81.75 82.00 576 82.03 82.69 81.71 82.11 574 82.03 82.41 81.78 82.26 572 82.04 82.46 81.66 82.14 570 81.97 82.60 81.80 82.30 568 81.90 82.77 81.78 82.16 566 81.98 82.43 81.77 82.25 564 82.06 82.61 81.75 82.15 562 81.93 82.63 81.58 82.16 560 81.84 82.55 81.72 81.90 558 81.95 82.48 81.90 82.11 556 81.88 82.38 81.73 82.10 554 81.91 82.46 81.65 82.23 552 81.89 82.35 81.74 82.20 550 81.85 82.84 81.66 82.07 548 81.74 82.62 81.71 82.01 546 81.77 82.44 81.76 82.22 544 82.08 82.60 81.54 82.03 542 81.94 82.29 81.53 82.07 540 82.03 82.37 81.54 82.06 538 81.78 82.41 81.59 82.07 536 81.85 82.46 81.62 82.08 534 81.83 82.34 81.59 82.09 532 81.81 82.34 81.66 81.82 530 81.91 82.42 81.36 81.76 528 81.72 82.15 81.48 81.87 526 81.78 82.40 81.43 81.93 524 81.83 82.38 81.61 81.94 522 81.54 82.51 81.49 81.95 520 81.67 82.19 81.41 81.79 518 81.53 82.33 81.40 81.71 516 81.46 82.19 81.51 81.83 514 81.69 82.23 81.29 81.59 512 81.75 82.21 81.20 81.65 510 81.56 82.17 81.38 81.69 508 81.47 82.19 81.45 81.87 506 81.66 82.18 81.55 81.48 504 81.48 82.29 81.30 81.60 502 81.64 82.07 81.36 81.67 500 81.33 82.22 81.04 81.78 498 81.33 82.05 81.16 81.55 496 81.53 81.99 81.41 81.74 494 81.48 81.95 80.94 81.57 492 81.53 81.98 81.24 81.64 490 81.34 81.91 81.32 81.31 488 81.26 81.97 81.11 81.49 486 81.32 82.13 80.87 81.43 484 81.48 81.93 80.99 81.57 482 81.30 82.01 80.99 81.62 480 81.47 81.81 80.78 81.39 478 81.07 81.77 80.91 81.32 476 81.33 82.02 80.59 81.42 474 81.30 82.07 80.94 81.36 472 81.19 82.07 80.74 81.51 470 81.15 81.81 80.95 81.36 468 81.34 81.80 80.88 81.24 466 81.36 81.72 80.71 81.12 464 80.96 81.89 80.74 81.12 462 80.84 81.70 80.85 81.33 460 81.24 81.81 80.27 81.42 458 81.01 81.61 80.35 81.13 456 81.05 81.52 80.68 81.01 454 80.84 81.78 80.35 80.59 452 80.83 81.63 80.71 80.96 450 81.00 81.30 80.33 81.34 448 80.72 81.58 80.56 80.73 446 80.81 81.66 80.40 80.97 444 81.09 81.61 80.28 80.97 442 81.23 81.61 80.25 80.93 440 81.12 81.66 80.26 80.64 438 80.49 81.18 80.25 80.78 436 80.51 81.05 79.79 80.91 434 80.90 81.33 80.15 80.74 432 80.61 81.53 79.89 80.59 430 80.64 81.32 80.05 80.34 428 80.64 81.07 80.31 80.49 426 80.87 81.44 79.87 80.67 424 80.63 81.10 79.73 80.12 422 80.41 81.42 79.84 80.73 420 80.36 81.09 80.14 80.40 418 80.20 81.14 79.96 80.56 416 80.13 80.70 80.01 80.86 414 80.17 81.44 79.42 80.04 412 80.17 81.06 79.16 79.93 410 79.91 80.38 79.59 80.11 408 80.27 80.91 79.88 80.89 406 79.48 80.89 79.23 79.85 404 80.19 80.20 79.17 80.20 402 80.16 80.26 79.52 79.82 400 80.18 80.19 79.26 79.61 398 79.37 80.09 78.98 79.61 396 79.82 80.77 78.85 79.23 394 79.59 80.36 78.70 79.28 392 80.33 80.74 78.40 80.00 390 80.17 80.03 78.78 79.57 388 80.03 80.37 79.00 78.95 386 79.86 80.87 78.76 80.04 384 80.22 80.10 79.23 79.59 382 79.63 79.90 79.42 79.40 380 79.63 80.30 77.53 79.18 1650 91.95 92.78 92.40 92.79 1640 91.97 92.78 92.41 92.81 1630 91.97 92.78 92.42 92.82 1620 91.97 92.80 92.41 92.80 1610 91.97 92.79 92.41 92.80 1600 91.96 92.78 92.40 92.80 1590 91.95 92.77 92.39 92.80 1580 91.93 92.76 92.37 92.78 1570 91.93 92.73 92.36 92.78 1560 91.90 92.73 92.36 92.76 1550 91.89 92.71 92.33 92.74 1540 91.86 92.68 92.31 92.73 1530 91.85 92.67 92.29 92.71 1520 91.82 92.64 92.27 92.69 1510 91.81 92.62 92.25 92.67 1500 91.79 92.60 92.23 92.64 1490 91.77 92.58 92.20 92.62 1480 91.75 92.56 92.18 92.59 1470 91.72 92.53 92.17 92.58 1460 91.69 92.50 92.12 92.54 1450 91.67 92.47 92.11 92.53 1440 91.63 92.45 92.07 92.50 1430 91.61 92.42 92.04 92.47 1420 91.58 92.38 92.01 92.44 1410 91.55 92.36 91.97 92.41 1400 91.51 92.32 91.96 92.38 1390 91.49 92.29 91.91 92.35 1380 91.46 92.26 91.88 92.32 1370 91.42 92.22 91.84 92.28 1360 91.39 92.19 91.80 92.24 1350 91.35 92.14 91.77 92.21 1340 91.31 92.11 91.72 92.16 1330 91.28 92.06 91.68 92.12 1320 91.23 92.02 91.64 92.08 1310 91.19 91.98 91.59 92.05 1300 91.14 91.93 91.55 91.99 1290 91.10 91.89 91.51 91.95 1280 91.05 91.84 91.45 91.90 1270 91.00 91.79 91.40 91.86 1260 90.95 91.74 91.35 91.80 1250 90.89 91.68 91.29 91.76 1240 90.84 91.62 91.23 91.70 1230 90.78 91.57 91.17 91.63 1220 90.71 91.49 91.10 91.57 1210 90.66 91.43 91.04 91.50 1200 90.58 91.37 90.98 91.44 1190 90.51 91.29 90.89 91.37 1180 90.44 91.22 90.81 91.28 1170 90.36 91.14 90.73 91.21 1160 90.28 91.06 90.65 91.13 1150 90.18 90.97 90.55 91.04 1140 90.11 90.86 90.46 90.93 1130 90.01 90.77 90.36 90.83 1120 89.90 90.66 90.26 90.74 1110 89.78 90.55 90.14 90.61 1100 89.67 90.43 90.01 90.49 1090 89.55 90.30 89.88 90.37 1080 89.39 90.17 89.73 90.23 1070 89.25 90.01 89.58 90.07 1060 89.10 89.85 89.42 89.91 1050 88.93 89.68 89.25 89.74 1040 88.74 89.50 89.05 89.54 1030 88.53 89.29 88.85 89.33 1020 88.31 89.06 88.62 89.11 1010 88.08 88.83 88.36 88.86 1000 87.82 88.56 88.09 88.60 990 87.52 88.26 87.81 88.30 980 87.19 87.92 87.47 87.96 970 86.83 87.56 87.11 87.59 960 86.44 87.17 86.70 87.19 950 86.02 86.73 86.26 86.74