# 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 2019-12-18 (789 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 88.61 89.10 88.51 88.36 998 88.51 88.06 88.83 88.42 996 89.01 88.51 89.00 88.74 994 87.79 88.72 87.79 88.22 992 88.95 88.66 87.69 87.99 990 87.40 89.61 88.34 87.91 988 87.73 89.04 88.13 88.71 986 88.43 88.64 88.01 88.68 984 88.29 89.43 89.23 88.47 982 88.42 88.42 88.23 88.28 980 88.78 88.51 87.95 88.35 978 88.80 88.74 88.14 88.28 976 88.17 88.22 87.93 87.91 974 88.21 88.07 87.89 88.27 972 87.76 88.06 87.77 88.40 970 88.16 87.85 87.92 87.85 968 87.87 88.18 88.12 87.75 966 87.96 88.31 87.30 87.73 964 88.21 87.71 87.77 87.80 962 87.89 87.90 88.14 88.08 960 87.87 87.74 87.39 87.96 958 87.72 88.43 87.44 87.62 956 86.84 87.49 87.05 87.32 954 87.83 87.36 87.13 87.21 952 87.37 87.71 87.14 87.64 950 86.84 87.14 87.68 87.49 948 87.47 87.81 87.20 87.06 946 87.07 86.79 86.59 87.87 944 87.31 86.74 86.55 87.33 942 86.48 87.36 86.89 86.86 940 86.72 87.00 86.21 86.80 938 86.79 86.78 86.18 87.20 936 87.03 87.04 86.23 86.66 934 86.67 86.69 86.29 86.23 932 86.45 86.63 85.94 86.84 930 86.00 86.72 86.40 86.43 928 85.98 86.54 86.10 86.34 926 86.00 86.16 85.89 86.51 924 85.79 85.63 85.80 86.60 922 85.92 86.36 85.59 85.87 920 85.66 85.71 85.88 85.58 918 85.59 85.62 85.72 85.65 916 86.18 85.56 85.41 85.58 914 85.23 85.09 85.41 85.49 912 84.97 85.29 85.16 85.18 910 84.97 85.41 85.29 85.45 908 84.92 85.10 84.99 85.40 906 84.83 84.82 85.08 85.54 904 84.82 84.67 84.62 84.88 902 84.47 84.35 84.44 84.61 900 84.53 84.82 84.68 84.38 898 84.36 84.57 84.21 84.06 896 84.10 84.30 83.96 84.04 894 84.13 84.20 83.92 83.96 892 84.34 83.94 83.96 83.73 890 83.67 83.84 84.04 83.87 888 83.76 83.55 83.24 83.59 886 83.66 83.81 83.20 83.04 884 83.24 83.39 82.92 83.45 882 83.21 83.50 82.98 83.02 880 83.32 83.07 82.93 83.24 878 83.14 82.91 82.98 83.25 876 82.88 82.95 82.50 82.78 874 82.63 82.63 82.13 82.57 872 82.49 82.86 82.11 82.43 870 82.73 82.43 82.09 82.43 868 81.99 82.08 82.23 81.98 866 81.85 81.72 81.96 81.67 864 81.96 81.61 81.97 82.02 862 81.96 81.79 81.58 82.10 860 82.01 81.91 81.60 81.83 858 81.49 81.48 81.46 81.33 856 81.22 81.08 81.25 81.25 854 81.03 80.93 81.02 81.43 852 81.07 81.04 81.23 80.83 850 81.01 80.96 80.73 81.05 848 81.03 80.86 80.74 80.75 846 80.58 80.95 80.71 81.03 844 80.65 80.62 80.73 80.83 842 80.70 80.65 80.50 80.41 840 80.57 80.59 80.79 80.28 838 80.43 80.82 80.28 80.08 836 80.79 80.63 80.42 80.66 834 80.37 80.40 80.19 80.42 832 80.46 80.71 80.19 80.57 830 80.13 80.38 80.04 80.34 828 80.05 80.29 80.34 80.24 826 80.46 80.19 80.11 80.03 824 80.27 80.43 80.18 80.27 822 80.27 80.27 80.32 80.08 820 80.36 80.33 80.30 80.07 818 79.80 80.70 79.99 80.19 816 80.25 80.61 80.31 80.28 814 80.23 80.42 80.26 80.54 812 80.38 80.37 80.25 80.23 810 80.37 80.51 80.19 80.33 808 80.29 80.24 80.38 80.71 806 80.31 80.12 80.16 80.27 804 80.56 80.68 80.31 80.24 802 80.26 80.85 80.57 80.44 800 80.15 80.73 80.54 80.34 798 80.86 80.81 80.59 80.81 796 80.66 80.68 80.67 80.57 794 80.86 80.74 80.53 80.49 792 80.67 80.89 80.87 80.93 790 80.85 80.75 80.61 80.69 788 80.75 80.79 80.82 81.04 786 80.94 80.95 80.70 80.82 784 80.84 80.98 81.13 81.07 782 81.18 81.02 80.96 80.99 780 81.19 81.09 81.13 81.42 778 81.22 81.24 81.12 81.29 776 81.20 81.33 81.31 81.28 774 81.19 81.56 81.38 81.38 772 81.50 81.53 81.48 81.34 770 81.30 81.49 81.45 81.50 768 81.67 81.69 81.58 81.72 766 81.48 81.45 81.77 81.50 764 81.61 81.65 81.48 81.56 762 81.91 81.92 81.60 81.89 760 81.57 81.93 81.67 82.08 758 81.60 81.86 81.66 81.93 756 81.76 82.09 81.87 81.98 754 81.63 82.16 81.94 82.25 752 82.10 82.08 81.94 82.08 750 82.09 82.33 82.22 82.07 748 82.10 82.18 82.12 82.49 746 82.22 82.26 82.07 82.33 744 82.19 82.22 82.24 82.34 742 82.27 82.36 82.47 82.46 740 82.34 82.50 82.45 82.35 738 82.05 82.39 82.54 82.36 736 82.53 82.52 82.43 82.66 734 82.65 82.51 82.57 82.45 732 82.58 82.58 82.39 82.70 730 82.41 82.49 82.45 82.78 728 82.72 82.79 82.65 82.68 726 82.60 82.89 82.80 82.75 724 82.29 82.79 82.68 82.73 722 82.80 82.88 82.64 82.79 720 82.98 82.81 82.73 82.87 718 82.91 82.78 82.90 83.01 716 82.97 83.02 82.67 83.00 714 83.06 83.13 82.89 83.00 712 82.88 82.92 82.94 82.96 710 82.80 83.09 83.03 83.07 708 82.96 83.21 83.04 83.01 706 82.85 83.08 82.95 83.04 704 83.06 83.23 82.98 83.26 702 82.99 83.09 83.11 83.24 700 82.97 83.31 83.25 83.19 698 82.73 83.26 83.08 83.15 696 83.07 83.35 83.04 83.18 694 83.23 83.26 83.15 83.32 692 83.06 83.23 83.10 83.33 690 83.34 83.37 82.96 83.07 688 83.11 83.29 83.32 83.33 686 83.24 83.37 83.40 83.32 684 83.23 83.25 83.45 83.31 682 83.16 83.50 83.34 83.34 680 83.20 83.39 83.51 83.36 678 83.17 83.66 83.31 83.55 676 83.22 83.21 83.45 83.46 674 83.41 83.45 83.25 83.56 672 83.35 83.60 83.54 83.56 670 83.40 83.45 83.39 83.60 668 83.48 83.64 83.37 83.76 666 83.44 83.70 83.62 83.69 664 83.53 83.57 83.69 83.52 662 83.51 83.81 83.52 83.66 660 83.54 83.67 83.46 83.67 658 83.54 83.79 83.62 83.69 656 83.41 83.80 83.70 83.80 654 83.42 83.92 83.56 83.79 652 83.60 83.70 83.64 83.70 650 83.45 83.84 83.62 83.61 648 83.70 83.71 83.85 83.58 646 83.81 83.82 83.61 83.87 644 83.41 83.80 83.75 83.92 642 83.60 83.71 83.66 83.69 640 83.61 83.73 83.82 83.77 638 83.57 83.96 83.64 83.79 636 83.62 83.85 83.76 83.84 634 83.60 83.93 83.82 83.77 632 83.75 83.77 83.75 83.70 630 83.61 83.57 83.95 83.94 628 83.62 83.89 83.73 83.83 626 83.59 83.81 83.63 84.06 624 83.75 83.90 83.87 84.12 622 83.72 84.00 83.71 84.09 620 83.74 83.87 83.89 84.02 618 83.70 83.99 83.76 83.89 616 83.83 83.98 84.03 83.91 614 83.86 83.96 83.92 83.83 612 83.66 83.99 83.86 83.93 610 83.79 84.00 83.70 84.02 608 83.65 83.94 83.84 83.91 606 83.72 84.27 83.86 84.01 604 83.75 84.03 84.03 83.96 602 83.76 83.95 83.93 84.03 600 83.73 84.02 83.87 83.91 598 83.77 83.97 83.93 83.85 596 83.90 83.98 83.90 83.98 594 83.66 84.21 83.82 84.18 592 83.76 84.06 83.96 84.04 590 83.80 84.18 83.99 83.79 588 83.56 84.07 83.99 83.80 586 83.64 83.94 84.07 83.79 584 83.73 84.32 84.16 84.03 582 83.73 83.83 84.11 84.09 580 83.89 83.91 83.86 84.13 578 83.65 83.89 84.01 84.03 576 83.73 84.11 83.86 83.91 574 83.49 84.11 83.97 83.97 572 83.76 84.06 83.95 83.97 570 83.51 83.97 83.98 83.96 568 83.69 84.08 83.85 83.87 566 83.66 84.15 83.86 83.95 564 83.80 83.98 83.79 84.04 562 83.88 83.87 83.79 83.79 560 83.83 83.87 83.97 84.02 558 83.60 83.97 83.79 84.05 556 83.80 83.96 84.03 83.99 554 83.64 83.98 83.75 83.95 552 83.65 83.97 83.90 83.80 550 83.75 83.96 83.76 83.94 548 83.43 84.04 83.81 83.92 546 83.62 83.93 83.71 83.88 544 83.40 83.84 83.96 83.96 542 83.58 83.90 83.67 83.88 540 83.67 83.81 83.73 83.76 538 83.59 83.94 83.83 83.91 536 83.76 83.87 83.89 83.92 534 83.68 83.86 83.59 83.93 532 83.72 83.91 83.78 83.79 530 83.47 83.82 83.98 83.93 528 83.57 83.96 83.75 83.91 526 83.35 83.92 83.60 83.90 524 83.24 83.94 83.86 83.93 522 83.48 83.97 83.80 83.80 520 83.32 83.86 83.78 83.75 518 83.47 83.96 83.74 83.91 516 83.33 83.90 83.74 83.64 514 83.30 83.81 83.52 83.89 512 83.41 83.81 83.37 83.93 510 83.42 83.76 83.45 83.69 508 83.33 83.72 83.42 83.64 506 83.13 83.49 83.64 83.61 504 83.02 83.87 83.62 83.70 502 83.26 83.70 83.70 83.86 500 83.33 83.55 83.58 83.58 498 83.28 83.72 83.36 83.80 496 83.19 83.80 83.69 83.77 494 83.20 83.51 83.54 83.45 492 83.18 83.67 83.39 83.63 490 83.03 83.79 83.41 83.70 488 83.22 83.46 83.28 83.58 486 82.99 83.71 83.59 83.77 484 83.15 83.66 83.40 83.53 482 82.89 83.65 83.45 83.49 480 83.18 83.61 83.51 83.56 478 82.82 83.78 83.23 83.41 476 82.91 83.38 83.41 83.51 474 82.73 83.56 83.33 83.30 472 83.00 83.60 83.36 83.27 470 83.12 83.49 83.42 83.00 468 82.89 83.52 83.44 83.24 466 82.70 83.48 83.52 83.49 464 82.84 83.24 83.47 83.29 462 82.87 82.97 83.09 83.33 460 82.85 83.54 83.29 83.39 458 82.95 83.16 83.05 83.16 456 82.86 83.26 83.24 83.29 454 82.65 83.43 83.26 83.20 452 82.58 83.30 83.08 83.07 450 82.62 83.22 83.13 83.35 448 82.75 83.18 82.98 83.37 446 82.46 83.05 82.94 83.15 444 82.61 83.13 83.21 83.22 442 82.42 83.45 82.99 83.10 440 82.43 83.27 82.91 82.95 438 82.54 83.12 82.84 82.72 436 82.07 83.06 82.74 83.02 434 82.41 83.30 82.69 83.18 432 82.11 83.07 83.10 83.11 430 82.02 83.09 82.72 82.97 428 81.94 82.77 83.02 82.91 426 81.97 82.70 82.96 82.82 424 82.19 82.83 82.80 82.74 422 81.81 82.82 83.07 82.54 420 81.92 83.20 82.64 82.77 418 81.87 82.53 82.84 83.04 416 81.83 82.81 82.59 82.90 414 81.93 82.68 83.13 82.90 412 81.42 82.77 82.45 82.10 410 81.94 82.96 82.57 82.49 408 81.76 83.00 82.36 82.35 406 81.36 82.64 82.11 82.93 404 81.58 82.56 82.49 82.52 402 81.39 82.68 82.33 82.27 400 81.38 82.56 82.26 82.47 398 81.96 82.01 82.18 81.91 396 81.50 82.87 82.44 82.62 394 81.07 82.71 82.24 82.02 392 81.62 82.23 82.01 82.50 390 81.31 82.30 81.77 81.17 388 80.99 82.33 82.01 81.66 386 81.14 82.20 81.74 81.94 384 81.28 82.32 81.74 81.98 382 80.99 82.51 81.56 82.52 380 80.93 82.93 81.93 81.06 1650 93.75 93.61 93.61 93.66 1640 93.75 93.63 93.61 93.67 1630 93.77 93.63 93.63 93.67 1620 93.74 93.63 93.61 93.67 1610 93.75 93.63 93.62 93.67 1600 93.75 93.63 93.61 93.66 1590 93.74 93.62 93.59 93.66 1580 93.73 93.61 93.59 93.65 1570 93.72 93.60 93.57 93.63 1560 93.70 93.58 93.56 93.63 1550 93.69 93.56 93.54 93.61 1540 93.67 93.55 93.53 93.60 1530 93.65 93.53 93.51 93.58 1520 93.63 93.51 93.49 93.56 1510 93.61 93.50 93.47 93.53 1500 93.59 93.48 93.45 93.52 1490 93.58 93.46 93.42 93.49 1480 93.55 93.43 93.39 93.48 1470 93.52 93.41 93.37 93.45 1460 93.49 93.38 93.35 93.42 1450 93.47 93.35 93.31 93.39 1440 93.43 93.33 93.29 93.37 1430 93.41 93.30 93.25 93.34 1420 93.38 93.27 93.22 93.31 1410 93.35 93.25 93.21 93.28 1400 93.32 93.22 93.16 93.26 1390 93.29 93.19 93.14 93.23 1380 93.25 93.16 93.09 93.19 1370 93.19 93.09 93.04 93.12 1360 93.14 93.05 92.99 93.08 1350 93.10 93.00 92.94 93.04 1340 93.06 92.97 92.91 93.00 1330 93.03 92.93 92.87 92.96 1320 92.99 92.89 92.82 92.93 1310 92.94 92.86 92.79 92.89 1300 92.90 92.81 92.74 92.85 1290 92.86 92.78 92.70 92.81 1280 92.81 92.73 92.66 92.76 1270 92.77 92.69 92.60 92.72 1260 92.72 92.64 92.56 92.66 1250 92.67 92.59 92.51 92.62 1240 92.61 92.53 92.45 92.56 1230 92.56 92.47 92.39 92.50 1220 92.50 92.42 92.34 92.45 1210 92.44 92.36 92.27 92.38 1200 92.37 92.29 92.21 92.32 1190 92.29 92.22 92.14 92.25 1180 92.21 92.14 92.06 92.17 1170 92.14 92.06 91.98 92.10 1160 92.06 91.99 91.91 92.03 1150 91.99 91.92 91.84 91.95 1140 91.91 91.83 91.74 91.86 1130 91.80 91.73 91.65 91.76 1120 91.70 91.63 91.54 91.66 1110 91.58 91.52 91.44 91.56 1100 91.47 91.40 91.31 91.44 1090 91.33 91.28 91.19 91.31 1080 91.20 91.14 91.05 91.17 1070 91.05 90.99 90.90 91.02 1060 90.90 90.84 90.74 90.87 1050 90.72 90.67 90.57 90.69 1040 90.52 90.48 90.39 90.52 1030 90.32 90.28 90.18 90.30 1020 90.10 90.06 89.96 90.08 1010 89.86 89.82 89.72 89.83 1000 89.58 89.55 89.46 89.57 990 89.29 89.27 89.17 89.28 980 88.96 88.95 88.83 88.97 970 88.60 88.60 88.49 88.61 960 88.21 88.20 88.09 88.21 950 87.77 87.76 87.67 87.78