# 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 2022-05-27 (1680 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 84.42 84.30 84.83 84.58 998 84.03 85.55 84.64 83.44 996 84.63 84.93 84.33 84.34 994 83.96 84.67 84.87 84.97 992 83.65 83.08 84.38 83.81 990 84.00 83.49 84.51 82.83 988 84.50 84.17 85.81 85.45 986 84.32 84.44 84.77 84.10 984 84.72 83.50 84.34 83.71 982 85.16 84.02 84.51 83.71 980 84.67 83.86 84.74 83.86 978 84.66 84.30 84.30 83.64 976 83.09 84.34 83.91 84.72 974 84.05 83.82 83.86 83.84 972 84.58 83.53 83.92 84.16 970 83.69 83.75 83.92 83.26 968 84.36 83.65 84.43 83.75 966 83.49 83.87 84.24 83.20 964 83.94 83.50 84.09 83.62 962 83.45 83.29 83.99 83.59 960 83.32 83.23 83.92 83.44 958 83.11 83.30 83.92 82.73 956 83.48 82.97 83.33 83.37 954 83.05 84.03 83.41 82.92 952 82.96 83.34 84.11 83.62 950 83.51 82.81 82.76 82.79 948 83.65 83.31 83.46 82.66 946 82.97 82.57 83.06 82.75 944 82.83 83.00 83.41 82.96 942 82.92 83.16 82.69 82.67 940 82.33 82.98 82.84 82.79 938 82.67 82.07 83.26 82.88 936 82.18 83.23 83.02 82.36 934 82.70 82.14 82.75 82.46 932 82.74 82.16 82.46 82.64 930 82.56 81.75 82.41 82.37 928 82.45 82.68 82.13 81.79 926 82.58 81.68 82.24 81.72 924 81.74 81.87 81.96 82.07 922 81.76 81.70 81.74 81.96 920 81.74 81.32 82.26 81.85 918 81.55 81.55 81.89 81.38 916 81.72 81.46 81.78 81.12 914 81.18 81.35 81.56 80.73 912 81.48 81.06 81.36 81.03 910 80.98 81.06 81.06 81.31 908 81.19 80.83 81.08 80.83 906 81.21 80.44 80.74 80.77 904 80.71 80.64 80.99 80.80 902 80.61 80.04 80.66 80.13 900 81.13 79.92 81.06 80.52 898 80.90 80.34 80.23 79.87 896 80.09 80.16 80.29 79.83 894 79.76 80.03 80.17 79.60 892 79.74 79.84 80.43 79.68 890 79.68 79.27 80.16 79.59 888 79.47 79.19 80.10 78.93 886 79.70 78.90 79.81 78.94 884 79.36 79.18 79.73 79.17 882 79.28 78.99 79.01 79.04 880 79.25 79.24 79.21 79.02 878 78.88 78.49 78.83 78.21 876 78.88 78.84 78.36 78.63 874 78.92 78.57 78.80 78.36 872 78.64 78.24 78.66 78.29 870 78.40 78.16 78.43 77.89 868 77.78 77.90 78.09 77.77 866 78.00 77.88 78.50 77.90 864 77.74 77.93 77.93 77.99 862 77.81 77.68 77.79 77.59 860 77.27 77.93 77.46 77.08 858 77.33 77.34 77.73 77.10 856 77.04 77.15 77.55 77.34 854 76.60 77.05 77.39 76.76 852 77.02 77.22 77.19 76.41 850 76.67 76.88 76.94 77.04 848 76.79 76.86 76.76 76.40 846 76.81 76.88 77.08 76.59 844 76.93 76.47 76.95 76.52 842 76.71 76.43 76.70 76.37 840 76.59 76.48 76.89 76.38 838 76.29 76.49 76.62 76.46 836 76.45 76.31 76.33 76.44 834 76.70 75.94 76.61 76.12 832 76.30 76.31 76.63 75.78 830 76.33 75.96 76.32 75.95 828 76.04 75.99 76.56 75.92 826 75.83 75.87 76.67 76.22 824 76.14 76.09 76.45 76.00 822 76.15 75.92 76.29 75.78 820 76.27 76.17 76.78 76.05 818 75.98 76.09 76.53 76.06 816 76.22 76.50 76.42 75.40 814 75.99 76.74 76.44 75.64 812 76.09 76.43 76.25 76.15 810 76.38 76.37 76.38 75.71 808 76.18 75.88 76.31 75.97 806 76.50 76.27 76.47 76.08 804 76.59 76.39 77.09 76.13 802 76.29 76.56 76.44 76.03 800 76.76 76.49 76.38 76.30 798 76.19 76.56 76.32 76.09 796 76.72 76.71 76.77 76.22 794 76.74 76.57 76.74 76.13 792 76.67 76.68 76.81 76.34 790 76.80 76.68 77.06 76.54 788 76.86 76.71 76.92 76.75 786 76.92 76.85 77.08 76.66 784 76.74 76.91 77.62 76.67 782 76.84 76.55 76.96 77.05 780 76.99 77.03 77.13 76.91 778 77.25 77.02 77.42 77.15 776 77.12 76.70 76.96 77.04 774 77.41 77.25 77.60 76.68 772 77.17 77.21 77.39 77.12 770 77.28 77.22 77.50 76.88 768 77.40 77.26 77.62 77.17 766 77.25 77.37 77.70 77.19 764 77.39 77.56 77.91 77.09 762 77.68 77.56 77.54 77.32 760 77.56 77.44 77.68 77.51 758 77.75 77.73 77.94 77.66 756 77.68 77.72 77.80 77.56 754 77.60 77.82 77.72 77.59 752 77.69 77.91 78.09 77.83 750 77.94 77.78 77.91 77.50 748 78.19 77.82 78.27 77.59 746 77.92 78.15 77.99 77.71 744 78.07 78.27 78.08 78.16 742 78.04 78.30 78.02 77.71 740 78.13 78.07 78.19 77.83 738 78.13 78.22 78.20 78.04 736 78.17 78.28 78.36 77.96 734 78.23 78.35 78.32 77.85 732 78.12 78.21 78.40 77.78 730 78.04 78.25 78.30 78.23 728 78.45 78.47 78.44 77.95 726 78.36 78.37 78.71 78.26 724 78.30 78.22 78.41 78.22 722 78.36 78.54 78.76 78.16 720 78.32 78.43 78.52 78.26 718 78.27 78.57 78.70 78.14 716 78.60 78.37 78.71 78.02 714 78.41 78.59 78.52 78.39 712 78.39 78.52 78.55 78.31 710 78.59 78.84 78.68 78.28 708 78.60 78.44 78.86 78.37 706 78.49 78.59 78.77 78.39 704 78.67 78.76 78.66 78.11 702 78.84 78.83 78.84 78.58 700 78.56 78.98 78.84 78.22 698 78.66 78.97 78.93 78.45 696 78.96 78.65 78.94 78.45 694 78.82 78.85 78.92 78.68 692 78.76 78.86 78.81 78.59 690 78.81 78.98 78.73 78.81 688 78.64 78.99 79.02 78.65 686 78.93 78.80 79.12 78.45 684 78.83 78.91 78.76 78.72 682 78.84 78.84 78.93 78.62 680 78.78 78.80 78.91 78.38 678 78.72 78.89 79.03 78.55 676 79.06 78.87 78.88 78.68 674 79.08 78.96 78.96 78.59 672 78.89 78.87 79.14 78.68 670 78.86 79.00 79.14 78.67 668 78.84 78.92 79.12 78.63 666 79.11 79.05 79.11 78.70 664 78.88 79.05 78.96 78.68 662 78.99 79.10 79.02 78.81 660 78.86 79.01 78.93 78.61 658 78.97 79.13 78.88 78.68 656 78.93 78.98 79.11 78.66 654 79.05 79.17 79.08 78.73 652 78.90 79.31 79.25 78.70 650 78.90 78.99 79.04 78.60 648 79.01 79.08 78.98 78.57 646 79.11 79.27 78.91 78.77 644 78.90 79.11 79.04 78.72 642 79.05 79.18 78.98 78.68 640 78.95 79.16 79.12 78.84 638 78.81 79.31 79.20 78.85 636 78.93 79.08 79.28 78.90 634 78.81 79.07 79.18 78.97 632 78.84 79.14 79.12 78.78 630 79.00 79.28 79.01 78.78 628 79.02 79.31 79.02 78.78 626 78.81 79.22 79.14 78.64 624 79.03 78.98 78.81 78.78 622 78.93 79.29 78.93 78.79 620 78.97 79.22 79.24 78.73 618 78.89 79.15 79.16 78.76 616 78.96 79.16 79.20 78.91 614 78.99 79.17 79.05 78.81 612 78.95 79.33 78.89 78.83 610 78.92 79.39 79.14 78.74 608 78.81 79.16 79.09 78.62 606 79.06 79.19 79.04 78.84 604 78.71 79.11 78.87 78.50 602 78.78 79.10 79.09 78.69 600 78.88 79.09 78.99 78.73 598 78.88 79.12 78.95 78.79 596 78.95 79.04 79.03 78.66 594 78.87 79.00 78.81 78.73 592 78.85 79.00 78.91 78.64 590 78.85 79.20 78.87 78.77 588 78.75 79.06 79.07 78.70 586 78.74 79.10 78.92 78.54 584 78.71 79.51 78.77 78.97 582 78.82 78.99 78.87 78.80 580 78.66 79.05 78.91 78.67 578 78.64 78.99 78.83 78.56 576 78.83 79.07 78.85 78.66 574 78.64 79.00 78.61 78.56 572 78.77 78.97 78.60 78.55 570 78.58 78.99 78.82 78.68 568 78.58 78.87 78.74 78.68 566 78.76 78.85 78.39 78.58 564 78.84 78.71 78.62 78.62 562 78.49 78.86 78.64 78.66 560 78.47 79.14 78.86 78.53 558 78.61 78.86 78.58 78.56 556 78.55 78.75 78.58 78.54 554 78.60 78.87 78.59 78.49 552 78.55 78.91 78.57 78.40 550 78.46 78.78 78.43 78.37 548 78.72 78.58 78.40 78.45 546 78.44 78.52 78.32 78.16 544 78.35 78.67 78.41 78.41 542 78.35 78.79 78.42 78.27 540 78.28 78.70 78.25 78.18 538 78.31 78.66 78.64 78.22 536 78.50 78.78 78.29 78.26 534 78.40 78.68 78.43 78.16 532 78.35 78.74 78.37 78.25 530 78.30 78.57 78.30 78.20 528 78.08 78.61 78.21 78.18 526 78.02 78.48 78.20 78.07 524 78.37 78.68 78.23 77.88 522 77.89 78.38 78.24 78.10 520 78.13 78.38 78.08 77.91 518 77.94 78.41 78.26 78.04 516 78.09 78.25 77.98 78.22 514 78.09 78.35 78.01 77.81 512 78.15 78.39 77.88 77.85 510 77.88 78.37 77.96 77.78 508 78.16 78.21 77.96 77.82 506 77.81 78.19 77.84 77.96 504 77.91 78.28 77.86 77.66 502 77.77 77.95 78.01 77.88 500 77.75 78.12 77.86 77.67 498 77.64 78.32 77.77 77.75 496 77.65 77.89 77.72 77.55 494 77.71 78.12 77.82 77.52 492 77.88 78.14 77.63 77.58 490 77.68 77.96 77.30 77.55 488 77.74 78.02 77.65 77.53 486 77.69 77.97 77.41 77.48 484 77.53 78.01 77.42 77.46 482 77.70 77.94 77.21 77.56 480 77.38 77.78 77.22 77.36 478 77.62 78.04 77.17 77.39 476 77.33 77.80 77.37 77.27 474 77.35 77.89 77.18 77.52 472 77.35 77.75 77.16 77.19 470 77.31 77.50 77.06 76.95 468 77.32 77.81 77.23 77.01 466 77.28 77.68 76.97 77.10 464 77.24 77.59 77.16 77.03 462 77.33 77.46 76.89 77.07 460 77.32 77.31 76.92 76.89 458 77.11 77.49 76.71 76.59 456 77.37 77.49 76.86 76.99 454 77.20 77.57 76.90 76.90 452 76.83 77.70 76.53 76.61 450 77.21 77.50 76.99 76.46 448 76.98 77.10 76.60 76.44 446 76.74 77.05 76.60 76.55 444 76.90 76.92 76.33 76.48 442 76.72 76.91 76.34 76.48 440 76.42 76.98 76.17 76.38 438 76.68 76.88 76.46 76.56 436 76.70 77.35 76.49 76.25 434 76.36 76.63 76.39 76.03 432 76.58 76.50 76.34 76.13 430 76.49 76.88 76.51 76.14 428 75.99 76.84 76.24 76.19 426 76.22 76.62 76.16 75.68 424 76.50 76.45 75.81 76.21 422 75.92 76.29 76.25 75.70 420 76.07 76.57 75.77 75.88 418 76.46 76.49 76.58 75.92 416 76.03 76.19 75.85 76.07 414 76.13 76.64 75.47 75.68 412 76.17 76.09 75.30 76.18 410 76.04 76.31 74.99 75.17 408 76.32 75.73 75.23 75.49 406 76.02 75.66 75.44 75.12 404 76.31 76.59 75.67 75.11 402 75.53 76.20 75.06 75.70 400 75.84 75.94 75.05 74.81 398 75.28 76.30 74.47 74.90 396 75.43 76.25 74.35 75.70 394 75.39 76.01 74.86 75.00 392 75.73 75.94 74.96 75.16 390 76.45 75.34 75.20 75.24 388 75.58 75.30 74.91 74.20 386 75.62 74.64 75.38 74.44 384 75.49 76.43 75.07 75.50 382 75.20 75.47 75.08 74.00 380 75.10 75.01 74.30 74.19 1650 90.18 89.57 90.23 89.84 1640 90.20 89.57 90.24 89.84 1630 90.19 89.58 90.23 89.83 1620 90.19 89.57 90.23 89.84 1610 90.17 89.57 90.23 89.81 1600 90.17 89.55 90.22 89.81 1590 90.16 89.55 90.19 89.80 1580 90.15 89.53 90.19 89.77 1570 90.12 89.52 90.16 89.75 1560 90.11 89.51 90.15 89.73 1550 90.08 89.48 90.14 89.71 1540 90.06 89.47 90.11 89.68 1530 90.04 89.44 90.09 89.66 1520 90.02 89.42 90.06 89.64 1510 89.99 89.41 90.03 89.61 1500 89.96 89.39 90.00 89.58 1490 89.94 89.37 89.98 89.54 1480 89.90 89.33 89.94 89.52 1470 89.87 89.30 89.92 89.48 1460 89.84 89.27 89.90 89.46 1450 89.81 89.25 89.86 89.42 1440 89.78 89.22 89.83 89.40 1430 89.74 89.19 89.79 89.35 1420 89.72 89.17 89.77 89.32 1410 89.68 89.13 89.74 89.29 1400 89.65 89.10 89.71 89.25 1390 89.62 89.06 89.67 89.22 1380 89.57 89.04 89.63 89.17 1370 89.53 89.00 89.60 89.13 1360 89.49 88.97 89.56 89.10 1350 89.45 88.93 89.51 89.06 1340 89.40 88.89 89.48 89.02 1330 89.36 88.85 89.44 88.98 1320 89.32 88.81 89.39 88.93 1310 89.28 88.77 89.35 88.88 1300 89.22 88.73 89.31 88.84 1290 89.17 88.68 89.26 88.79 1280 89.12 88.64 89.21 88.75 1270 89.05 88.59 89.16 88.69 1260 89.01 88.54 89.10 88.65 1250 88.94 88.49 89.05 88.58 1240 88.89 88.42 88.99 88.52 1230 88.83 88.36 88.92 88.46 1220 88.75 88.31 88.86 88.38 1210 88.68 88.24 88.79 88.31 1200 88.61 88.17 88.72 88.25 1190 88.53 88.10 88.63 88.16 1180 88.43 88.01 88.55 88.08 1170 88.35 87.93 88.46 87.99 1160 88.26 87.85 88.38 87.90 1150 88.17 87.77 88.28 87.81 1140 88.07 87.67 88.18 87.71 1130 87.97 87.56 88.08 87.60 1120 87.84 87.46 87.97 87.50 1110 87.73 87.35 87.83 87.37 1100 87.60 87.22 87.71 87.24 1090 87.46 87.07 87.58 87.11 1080 87.31 86.95 87.42 86.96 1070 87.14 86.80 87.26 86.79 1060 86.98 86.62 87.09 86.62 1050 86.79 86.44 86.92 86.44 1040 86.60 86.24 86.70 86.24 1030 86.39 86.05 86.48 86.02 1020 86.14 85.81 86.25 85.79 1010 85.87 85.57 85.99 85.53 1000 85.61 85.29 85.71 85.26 990 85.31 84.99 85.41 84.96 980 84.97 84.68 85.06 84.62 970 84.58 84.31 84.68 84.25 960 84.16 83.91 84.28 83.83 950 83.71 83.47 83.84 83.41