# 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 2019-09-09 (689 days after) # Measured three 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 1000 89.56 88.18 88.60 998 89.43 89.19 88.53 996 88.41 89.35 88.94 994 89.40 89.13 88.85 992 88.57 89.44 88.93 990 88.88 89.11 88.72 988 88.60 88.70 88.72 986 89.23 89.04 88.67 984 88.56 88.41 88.42 982 88.48 88.58 88.46 980 88.52 88.76 88.32 978 89.10 89.05 88.03 976 88.55 88.02 88.96 974 88.50 87.78 88.67 972 88.13 88.69 88.67 970 88.60 87.98 88.96 968 87.91 88.39 88.14 966 88.28 88.21 88.61 964 88.62 88.63 88.62 962 88.44 87.95 88.56 960 88.22 88.67 87.32 958 87.60 87.92 87.57 956 87.56 88.13 87.04 954 87.80 87.80 87.80 952 87.66 87.87 87.76 950 87.73 87.74 87.19 948 88.03 87.62 88.12 946 87.13 87.56 87.16 944 87.38 87.41 86.96 942 87.19 87.69 87.65 940 87.51 87.56 87.39 938 86.94 86.85 87.11 936 87.35 87.15 86.92 934 87.29 87.28 86.54 932 86.47 86.91 87.04 930 86.76 86.53 86.58 928 86.40 86.34 86.60 926 86.89 86.22 86.47 924 86.50 86.46 86.10 922 86.48 86.02 86.15 920 86.33 86.68 86.13 918 86.37 86.23 85.38 916 86.12 86.25 85.87 914 86.00 86.17 86.01 912 85.70 85.26 85.57 910 85.81 85.53 85.54 908 85.32 85.69 85.65 906 85.41 85.27 84.99 904 84.87 85.31 84.99 902 85.03 85.31 84.66 900 84.88 84.82 84.83 898 84.74 84.87 84.58 896 84.67 84.59 84.35 894 84.82 84.45 84.48 892 84.60 84.23 84.26 890 84.27 84.44 84.01 888 84.19 84.02 84.03 886 84.01 83.92 83.54 884 83.80 83.84 83.53 882 83.53 83.62 83.33 880 83.21 83.45 83.37 878 82.99 83.24 83.15 876 83.29 83.52 83.03 874 82.92 83.13 82.82 872 82.91 83.14 82.87 870 83.00 82.96 82.57 868 82.82 82.49 82.34 866 82.42 82.34 82.04 864 82.24 82.48 82.41 862 82.27 82.17 82.03 860 82.68 82.29 81.72 858 81.87 82.06 81.72 856 82.10 81.77 81.27 854 81.67 81.73 81.46 852 81.32 81.57 81.52 850 81.35 81.12 81.22 848 81.21 81.20 81.32 846 80.86 81.28 80.90 844 81.23 81.39 80.90 842 81.12 81.34 80.69 840 80.96 81.31 80.84 838 80.96 81.15 80.72 836 80.94 80.95 81.32 834 80.65 80.79 80.86 832 80.84 80.64 80.80 830 81.21 80.92 80.58 828 80.68 80.87 80.67 826 80.84 80.70 80.90 824 80.93 80.35 80.83 822 80.38 80.68 80.92 820 80.87 80.85 80.54 818 80.75 80.99 80.58 816 80.72 81.03 80.80 814 80.87 80.93 80.57 812 80.63 80.73 80.63 810 80.58 80.75 80.56 808 80.74 80.93 80.87 806 81.16 80.88 80.69 804 80.88 81.01 80.86 802 81.21 80.95 80.57 800 80.86 80.97 80.76 798 80.94 81.38 80.85 796 80.96 81.02 81.22 794 81.35 81.06 81.13 792 81.32 81.11 80.85 790 81.46 81.30 81.10 788 81.56 81.44 81.07 786 81.51 81.54 81.29 784 81.44 81.50 81.45 782 81.53 81.04 81.45 780 81.72 81.53 81.51 778 81.68 81.88 81.63 776 81.81 81.77 81.73 774 81.94 81.94 81.66 772 82.10 81.74 81.96 770 81.80 82.02 82.05 768 82.22 82.09 81.62 766 82.46 82.18 82.19 764 82.26 81.98 82.01 762 82.23 82.22 82.16 760 82.49 82.08 81.98 758 82.22 82.50 82.19 756 82.49 82.58 82.15 754 82.56 82.39 82.58 752 82.51 82.70 82.37 750 82.79 82.72 82.55 748 82.58 82.87 82.58 746 82.98 82.70 82.69 744 82.93 83.04 82.70 742 82.68 82.73 82.62 740 82.95 83.16 82.63 738 83.16 82.93 82.80 736 82.80 83.11 82.88 734 82.95 83.07 82.75 732 82.95 83.23 82.98 730 83.20 83.23 82.88 728 83.28 83.26 82.88 726 83.37 83.16 83.23 724 83.47 83.16 83.20 722 83.27 83.18 83.01 720 83.20 83.38 83.07 718 83.43 83.45 83.30 716 83.42 83.24 83.33 714 83.50 83.54 83.26 712 83.66 83.29 83.64 710 83.66 83.72 83.35 708 83.54 83.80 83.37 706 83.53 83.69 83.53 704 83.50 83.85 83.43 702 83.49 83.70 83.54 700 83.75 83.63 83.50 698 83.61 83.86 83.58 696 83.84 83.69 83.55 694 83.62 83.83 83.56 692 83.74 83.78 83.72 690 83.75 83.89 83.69 688 83.83 83.95 83.63 686 83.88 83.87 83.63 684 83.82 83.75 83.83 682 83.73 83.97 83.68 680 83.82 84.08 83.65 678 84.01 84.01 83.70 676 84.07 83.89 83.81 674 84.18 84.10 83.78 672 84.08 84.18 84.01 670 84.15 84.11 84.01 668 84.04 84.11 83.74 666 84.22 84.08 84.09 664 84.12 84.19 83.83 662 84.04 84.07 84.05 660 84.30 84.22 84.09 658 84.23 84.10 83.90 656 84.23 84.24 83.91 654 84.22 84.42 83.85 652 84.49 84.31 84.04 650 84.11 84.30 84.05 648 84.30 84.23 84.03 646 84.36 84.29 84.01 644 84.39 84.25 84.15 642 84.45 84.33 84.19 640 84.18 84.46 84.18 638 84.38 84.28 84.12 636 84.35 84.25 84.06 634 84.31 84.31 84.17 632 84.32 84.42 84.19 630 84.28 84.21 84.32 628 84.48 84.53 84.16 626 84.56 84.59 84.33 624 84.43 84.46 84.43 622 84.41 84.54 84.11 620 84.68 84.32 84.24 618 84.43 84.59 84.24 616 84.47 84.58 84.35 614 84.44 84.66 84.24 612 84.49 84.39 84.26 610 84.47 84.40 84.17 608 84.42 84.30 84.24 606 84.41 84.47 84.19 604 84.56 84.52 84.28 602 84.45 84.38 84.26 600 84.34 84.55 84.22 598 84.40 84.32 84.19 596 84.42 84.29 84.30 594 84.55 84.34 84.29 592 84.51 84.44 84.08 590 84.35 84.49 84.24 588 84.48 84.55 84.38 586 84.46 84.53 84.21 584 84.61 84.57 84.18 582 84.40 84.73 84.08 580 84.41 84.41 84.08 578 84.54 84.56 84.21 576 84.48 84.55 83.90 574 84.42 84.56 84.23 572 84.36 84.47 84.29 570 84.56 84.43 84.20 568 84.52 84.31 84.11 566 84.56 84.30 83.85 564 84.32 84.35 84.18 562 84.31 84.43 84.21 560 84.43 84.44 84.27 558 84.46 84.35 84.24 556 84.50 84.40 84.03 554 84.31 84.45 84.02 552 84.38 84.56 84.13 550 84.30 84.38 84.09 548 84.57 84.53 83.99 546 84.40 84.52 84.19 544 84.30 84.40 84.19 542 84.31 84.41 84.12 540 84.36 84.64 84.10 538 84.52 84.35 84.11 536 84.29 84.41 84.15 534 84.46 84.16 84.08 532 84.37 84.01 83.92 530 84.26 84.32 84.18 528 84.38 84.52 84.01 526 84.38 84.40 84.05 524 84.14 84.42 84.07 522 84.33 84.34 84.10 520 84.44 84.33 83.92 518 84.41 84.18 84.15 516 84.41 84.52 84.07 514 84.16 84.41 83.96 512 84.35 84.44 83.83 510 84.05 84.14 83.94 508 84.15 84.40 83.94 506 84.28 84.22 83.85 504 84.11 84.20 83.96 502 84.10 84.07 83.82 500 84.28 84.20 83.78 498 83.91 84.18 83.83 496 84.23 84.31 83.99 494 84.09 84.23 84.07 492 84.42 84.03 83.88 490 84.23 84.20 83.67 488 83.82 84.12 83.89 486 84.12 84.07 83.72 484 84.13 84.12 83.64 482 84.20 84.18 83.78 480 84.14 84.08 83.71 478 84.04 83.94 83.74 476 84.06 83.95 83.59 474 84.38 83.92 83.56 472 84.01 84.12 83.56 470 83.89 83.99 83.93 468 84.03 83.85 83.45 466 83.98 83.84 83.59 464 83.63 83.88 83.46 462 83.73 83.85 83.43 460 83.72 83.78 83.28 458 83.93 83.85 83.51 456 83.88 83.71 83.30 454 83.79 83.70 83.42 452 83.55 83.83 83.25 450 83.80 83.79 83.49 448 83.83 83.84 83.67 446 83.35 83.40 83.35 444 83.67 83.61 83.57 442 83.66 83.64 83.47 440 83.84 83.49 82.84 438 83.51 83.42 82.92 436 83.14 83.25 82.79 434 83.33 83.26 83.42 432 83.59 83.59 83.26 430 83.53 83.67 83.04 428 83.71 83.29 83.26 426 83.56 83.77 83.32 424 83.53 83.23 82.87 422 83.52 83.47 83.37 420 83.15 83.89 82.83 418 83.56 83.88 83.17 416 83.15 83.27 82.95 414 83.10 83.87 83.05 412 83.37 83.60 83.55 410 83.41 83.16 83.12 408 83.61 83.29 82.92 406 83.31 83.76 83.02 404 83.11 83.46 83.20 402 83.41 83.30 82.31 400 83.25 83.21 82.83 398 83.27 82.64 82.59 396 82.72 83.27 82.84 394 82.16 83.03 82.45 392 83.28 83.01 82.06 390 83.22 82.91 82.87 388 83.03 83.56 82.93 386 83.20 82.95 81.84 384 83.32 82.63 82.48 382 82.35 82.98 82.78 380 82.62 82.32 82.73 1650 94.05 94.03 93.96 1640 94.07 94.03 93.97 1630 94.06 94.03 93.97 1620 94.06 94.03 93.97 1610 94.06 94.04 93.96 1600 94.05 94.03 93.95 1590 94.04 94.02 93.95 1580 94.03 94.01 93.94 1570 94.01 94.00 93.92 1560 94.00 93.99 93.90 1550 93.99 93.97 93.89 1540 93.97 93.95 93.87 1530 93.95 93.93 93.86 1520 93.92 93.91 93.82 1510 93.91 93.88 93.82 1500 93.88 93.86 93.79 1490 93.86 93.84 93.76 1480 93.83 93.81 93.74 1470 93.80 93.78 93.71 1460 93.77 93.76 93.68 1450 93.74 93.73 93.66 1440 93.71 93.70 93.62 1430 93.68 93.67 93.60 1420 93.66 93.65 93.57 1410 93.63 93.62 93.54 1400 93.60 93.59 93.52 1390 93.57 93.57 93.48 1380 93.53 93.53 93.44 1370 93.47 93.46 93.39 1360 93.43 93.42 93.34 1350 93.38 93.37 93.30 1340 93.34 93.34 93.26 1330 93.31 93.30 93.23 1320 93.28 93.26 93.19 1310 93.24 93.23 93.15 1300 93.20 93.18 93.11 1290 93.16 93.14 93.07 1280 93.11 93.09 93.03 1270 93.06 93.05 92.98 1260 93.02 93.01 92.94 1250 92.96 92.95 92.88 1240 92.91 92.91 92.83 1230 92.86 92.85 92.78 1220 92.81 92.80 92.73 1210 92.75 92.73 92.67 1200 92.68 92.67 92.60 1190 92.61 92.59 92.53 1180 92.53 92.52 92.45 1170 92.46 92.45 92.38 1160 92.38 92.37 92.30 1150 92.31 92.30 92.22 1140 92.21 92.21 92.14 1130 92.12 92.12 92.03 1120 92.03 92.01 91.94 1110 91.91 91.90 91.83 1100 91.80 91.78 91.71 1090 91.66 91.66 91.57 1080 91.53 91.52 91.43 1070 91.38 91.37 91.29 1060 91.22 91.20 91.13 1050 91.04 91.04 90.94 1040 90.86 90.85 90.76 1030 90.65 90.65 90.56 1020 90.43 90.43 90.33 1010 90.19 90.19 90.09 1000 89.92 89.91 89.83 990 89.63 89.62 89.53 980 89.31 89.30 89.20 970 88.95 88.95 88.85 960 88.56 88.55 88.44 950 88.12 88.11 88.00