# 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 2018-12-21 (427 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 89.58 89.75 91.05 90.79 998 89.70 90.33 91.32 90.62 996 89.88 88.66 90.76 89.61 994 89.68 90.03 90.39 90.17 992 90.60 90.16 89.83 90.26 990 89.90 89.68 89.67 89.94 988 89.90 89.82 89.92 90.37 986 90.16 89.78 89.45 90.03 984 89.27 90.29 90.52 89.44 982 89.77 90.28 89.48 90.06 980 90.25 89.58 89.83 89.57 978 89.70 88.81 89.78 90.13 976 89.40 90.06 90.18 90.25 974 89.61 89.58 88.93 89.51 972 89.38 89.25 89.63 89.63 970 89.60 89.97 90.06 90.17 968 89.27 89.34 88.82 89.34 966 89.70 89.61 89.69 89.21 964 90.19 89.80 89.28 89.06 962 89.76 88.76 89.15 89.33 960 88.82 89.04 88.85 89.08 958 89.35 88.44 89.62 88.91 956 88.89 89.08 88.34 89.51 954 88.70 89.39 88.48 88.98 952 89.08 88.52 89.30 88.30 950 88.92 88.26 88.59 88.90 948 88.42 88.80 88.88 88.78 946 88.63 88.51 89.10 88.89 944 88.25 88.22 89.27 88.74 942 88.32 87.82 88.35 89.04 940 88.63 88.14 88.42 88.31 938 87.89 88.11 88.65 88.05 936 88.23 88.13 88.17 87.13 934 87.91 87.90 88.18 88.31 932 88.05 88.11 87.83 87.92 930 88.05 87.76 88.21 88.19 928 87.38 88.07 87.66 88.43 926 87.52 87.57 87.91 87.85 924 87.68 87.28 87.34 87.82 922 87.54 87.73 87.53 87.88 920 88.05 87.83 87.42 87.47 918 87.30 87.44 87.36 87.42 916 87.35 87.08 87.30 87.22 914 86.69 87.02 87.29 87.03 912 87.00 86.95 87.27 86.61 910 87.03 86.42 87.04 87.18 908 87.11 86.34 86.98 86.94 906 86.63 86.48 86.69 86.55 904 86.27 85.84 86.55 86.40 902 86.51 85.69 86.03 86.43 900 85.97 86.34 86.18 86.58 898 86.34 86.02 86.25 86.03 896 86.28 86.35 85.96 85.96 894 85.29 85.55 85.73 86.07 892 85.66 85.60 85.66 85.68 890 85.56 85.64 85.47 85.51 888 85.58 85.20 85.38 85.27 886 84.95 85.06 85.37 85.38 884 85.25 85.13 85.01 85.28 882 84.81 84.82 85.33 84.93 880 84.47 84.67 84.79 84.67 878 84.36 84.37 84.84 84.52 876 84.39 84.32 84.73 84.54 874 84.16 84.09 84.25 84.67 872 84.29 83.95 84.20 84.06 870 83.79 83.75 84.13 83.83 868 83.74 83.56 83.98 83.89 866 83.55 83.75 83.60 83.65 864 83.54 83.40 83.44 83.84 862 83.26 83.34 83.42 83.45 860 83.23 83.34 83.42 83.21 858 83.38 83.05 83.14 83.44 856 82.96 82.93 82.82 82.98 854 82.97 83.03 83.08 83.07 852 82.76 83.04 82.82 82.98 850 82.72 82.55 82.81 82.67 848 82.34 82.37 82.99 82.74 846 82.21 82.70 82.49 82.73 844 82.49 82.57 82.95 82.26 842 82.49 82.03 82.64 82.52 840 82.20 81.95 82.50 82.69 838 82.30 82.22 82.46 82.12 836 82.02 82.10 82.25 81.84 834 82.17 81.79 82.35 82.11 832 81.95 81.78 81.86 82.39 830 81.69 81.34 82.46 82.30 828 81.83 81.75 82.36 82.08 826 81.81 82.08 82.63 82.32 824 81.85 81.82 82.19 82.26 822 81.94 81.97 82.02 82.01 820 82.09 82.15 82.08 82.19 818 82.19 82.15 81.85 82.44 816 82.28 81.82 81.86 81.92 814 81.74 81.86 81.74 82.34 812 82.20 81.76 82.44 82.36 810 82.08 81.94 82.41 81.81 808 82.03 82.05 82.10 82.13 806 81.90 81.81 82.19 82.32 804 82.14 82.07 82.44 82.45 802 82.42 82.18 82.22 82.56 800 82.44 82.34 82.06 82.65 798 82.08 81.89 82.91 82.29 796 82.38 82.53 82.50 82.56 794 82.25 82.39 82.60 82.43 792 82.69 82.33 82.66 82.43 790 82.44 82.84 82.74 82.76 788 82.34 82.80 82.59 82.57 786 82.91 82.67 82.80 82.76 784 82.97 82.43 83.02 82.59 782 82.89 82.59 83.14 82.96 780 82.97 82.69 83.48 83.26 778 82.80 82.84 83.22 83.27 776 83.11 83.19 83.24 83.45 774 82.99 82.81 83.49 83.16 772 83.13 82.93 83.36 83.34 770 83.12 83.27 83.48 83.41 768 83.32 83.07 83.49 83.38 766 83.15 83.39 83.66 83.45 764 83.07 83.42 83.44 83.43 762 83.44 83.58 83.46 83.43 760 83.62 83.70 83.73 83.71 758 83.61 83.65 83.77 83.93 756 83.59 83.79 84.10 83.94 754 84.05 83.82 83.98 83.94 752 84.14 83.94 83.85 83.83 750 83.58 83.59 84.00 84.09 748 83.99 83.90 83.82 84.15 746 84.24 83.82 84.34 84.12 744 84.02 83.77 84.27 84.40 742 83.96 83.94 84.14 84.25 740 84.40 83.99 84.21 84.26 738 84.15 84.14 84.32 84.37 736 84.01 84.59 84.43 84.54 734 84.53 84.20 84.25 84.59 732 84.25 84.48 84.57 84.67 730 84.57 84.48 84.66 84.48 728 84.59 84.38 84.77 84.50 726 84.58 84.34 84.72 84.53 724 84.48 84.51 84.89 84.87 722 84.64 84.45 84.64 84.75 720 84.55 84.44 84.74 84.85 718 84.46 84.55 84.95 85.03 716 84.99 84.83 84.91 84.85 714 84.66 84.76 84.80 84.81 712 84.66 84.83 84.64 85.04 710 84.86 84.89 85.03 85.00 708 84.87 84.91 84.91 85.02 706 84.84 84.84 85.02 85.10 704 84.89 84.90 85.27 85.03 702 85.12 84.78 85.20 85.23 700 85.14 84.89 85.10 85.00 698 85.30 85.08 85.18 85.27 696 85.11 85.07 85.23 85.47 694 85.12 85.00 85.50 85.32 692 85.14 85.11 85.30 85.21 690 85.08 85.03 85.34 85.21 688 85.26 84.93 85.35 85.18 686 85.18 85.16 85.50 85.31 684 85.28 85.12 85.40 85.48 682 85.18 85.10 85.37 85.64 680 85.24 85.18 85.52 85.53 678 85.40 85.33 85.29 85.57 676 85.42 85.19 85.31 85.89 674 85.32 85.21 85.71 85.49 672 85.48 85.47 85.68 85.59 670 85.48 85.30 85.74 85.39 668 85.43 85.32 85.61 85.70 666 85.52 85.36 85.79 85.72 664 85.47 85.41 85.67 85.65 662 85.38 85.56 85.92 85.86 660 85.58 85.56 85.73 85.87 658 85.57 85.48 85.81 85.72 656 85.45 85.47 85.78 85.64 654 85.79 85.65 85.95 85.72 652 85.57 85.50 85.90 85.74 650 85.58 85.60 85.77 85.82 648 85.73 85.78 85.82 85.95 646 85.70 85.70 85.89 85.91 644 85.75 85.69 86.05 86.15 642 85.70 85.80 85.99 86.00 640 85.78 85.88 86.20 86.07 638 85.65 85.84 86.16 86.00 636 85.67 85.72 85.95 86.08 634 85.90 85.90 86.01 86.16 632 85.71 85.84 86.06 86.11 630 85.86 85.84 86.28 85.94 628 86.01 85.69 86.23 86.04 626 85.84 85.96 86.00 86.06 624 85.98 85.98 86.32 86.10 622 85.67 85.98 86.22 86.05 620 85.84 86.00 86.15 86.08 618 86.03 85.99 86.25 86.27 616 85.91 85.75 86.23 86.26 614 85.88 86.06 86.17 86.19 612 85.98 86.01 86.19 86.14 610 85.98 85.95 86.12 86.27 608 85.88 85.94 86.33 86.22 606 86.22 86.13 86.50 86.33 604 85.99 86.17 86.22 86.22 602 86.02 85.97 86.41 86.15 600 85.83 85.98 86.29 86.25 598 86.21 86.04 86.40 86.29 596 86.12 86.00 86.38 86.27 594 86.07 85.95 86.26 86.23 592 86.02 85.86 86.41 86.26 590 86.06 85.73 86.31 86.32 588 85.99 85.94 86.37 86.21 586 86.13 85.94 86.43 86.26 584 86.14 85.92 86.38 86.20 582 86.14 85.99 86.30 86.24 580 86.02 86.18 86.41 86.36 578 86.13 86.13 86.39 86.39 576 86.17 86.19 86.41 86.39 574 86.30 86.11 86.48 86.41 572 85.96 86.15 86.57 86.45 570 86.12 85.87 86.36 86.36 568 86.17 85.96 86.62 86.39 566 86.08 85.92 86.48 86.33 564 86.23 86.20 86.49 86.30 562 86.24 85.95 86.41 86.56 560 86.12 86.26 86.43 86.34 558 86.16 86.00 86.34 86.39 556 86.17 86.11 86.52 86.44 554 86.03 86.12 86.44 86.42 552 86.13 86.03 86.41 86.20 550 86.03 86.38 86.51 86.36 548 86.25 86.02 86.56 86.32 546 86.05 86.15 86.66 86.54 544 86.25 86.06 86.54 86.55 542 86.13 86.34 86.48 86.39 540 86.07 86.16 86.29 86.40 538 86.10 86.11 86.53 86.50 536 86.18 86.31 86.42 86.48 534 86.21 86.14 86.42 86.48 532 85.97 85.97 86.56 86.28 530 86.10 86.24 86.60 86.32 528 86.03 86.05 86.56 86.32 526 86.20 86.23 86.73 86.37 524 86.22 86.17 86.64 86.44 522 86.03 86.06 86.62 86.32 520 86.14 86.11 86.35 86.47 518 86.06 85.87 86.59 86.50 516 86.17 86.01 86.77 86.40 514 86.02 86.25 86.46 86.53 512 86.11 86.15 86.79 86.16 510 86.35 86.15 86.59 86.13 508 86.25 86.24 86.67 86.46 506 85.91 85.91 86.73 86.45 504 86.00 86.01 86.61 86.27 502 86.31 86.25 86.28 86.38 500 86.16 86.10 86.36 86.34 498 86.13 86.05 86.64 86.27 496 86.06 86.02 86.59 86.41 494 86.19 86.00 86.32 86.23 492 86.09 86.02 86.73 86.55 490 85.97 86.21 86.63 86.24 488 86.26 86.18 86.38 86.42 486 86.08 86.05 86.41 86.60 484 86.13 86.11 86.63 86.27 482 86.08 85.88 86.45 86.32 480 86.06 86.07 86.43 86.33 478 85.73 85.94 86.55 86.24 476 85.89 85.92 86.53 86.44 474 86.16 85.99 86.46 86.45 472 85.95 85.78 86.34 86.36 470 86.02 85.99 86.37 86.36 468 85.88 85.81 86.50 86.58 466 85.99 85.78 86.49 86.22 464 86.06 85.68 86.35 86.20 462 85.76 85.87 86.19 86.37 460 86.17 85.80 86.25 86.40 458 85.84 85.82 86.17 86.48 456 85.92 85.86 86.52 86.14 454 85.89 86.17 86.59 86.42 452 86.00 86.08 86.34 86.12 450 85.80 85.70 86.33 86.27 448 85.98 85.54 86.51 86.28 446 86.12 85.73 86.59 86.01 444 86.06 85.87 86.60 86.17 442 85.90 85.74 86.04 86.19 440 85.89 85.65 86.22 86.24 438 85.79 85.87 86.18 86.30 436 85.38 85.60 85.75 86.46 434 86.13 85.84 86.04 86.11 432 85.90 85.81 86.14 85.88 430 85.84 85.64 86.30 86.25 428 85.97 85.99 86.42 86.47 426 85.67 85.76 86.47 86.29 424 85.68 86.03 86.56 86.20 422 85.51 85.74 86.38 86.06 420 85.99 85.86 86.29 86.05 418 86.17 85.61 86.37 85.74 416 85.65 85.50 86.47 86.01 414 85.64 85.57 86.35 86.49 412 85.60 85.82 86.62 85.74 410 85.74 85.64 86.00 86.17 408 85.43 85.82 85.72 86.02 406 85.77 85.65 86.16 85.32 404 85.53 85.42 86.56 85.92 402 85.37 85.47 86.03 85.78 400 85.61 85.18 86.16 85.38 398 85.57 85.45 86.51 85.30 396 85.70 85.58 86.00 85.49 394 85.56 85.93 86.63 85.79 392 85.12 84.69 86.11 86.16 390 85.21 84.95 87.17 85.17 388 85.99 84.74 86.75 85.76 386 85.20 84.44 85.45 85.87 384 85.47 85.74 85.48 86.49 382 85.37 85.21 86.32 86.98 380 86.16 84.96 85.59 85.91 1650 94.88 94.83 94.88 94.97 1640 94.90 94.84 94.90 94.98 1630 94.90 94.85 94.91 94.98 1620 94.89 94.85 94.90 94.98 1610 94.89 94.86 94.91 94.98 1600 94.89 94.83 94.90 94.98 1590 94.88 94.84 94.90 94.97 1580 94.87 94.82 94.89 94.97 1570 94.87 94.81 94.88 94.95 1560 94.84 94.79 94.87 94.93 1550 94.84 94.79 94.86 94.92 1540 94.82 94.76 94.84 94.91 1530 94.80 94.75 94.83 94.89 1520 94.78 94.74 94.81 94.87 1510 94.76 94.72 94.79 94.86 1500 94.74 94.70 94.77 94.84 1490 94.72 94.68 94.75 94.82 1480 94.70 94.66 94.73 94.80 1470 94.67 94.63 94.71 94.77 1460 94.64 94.61 94.68 94.75 1450 94.62 94.58 94.66 94.73 1440 94.60 94.56 94.64 94.69 1430 94.57 94.53 94.61 94.68 1420 94.54 94.51 94.59 94.65 1410 94.52 94.47 94.56 94.62 1400 94.49 94.46 94.54 94.60 1390 94.46 94.43 94.51 94.57 1380 94.43 94.39 94.48 94.54 1370 94.36 94.33 94.42 94.48 1360 94.33 94.30 94.38 94.44 1350 94.29 94.25 94.34 94.41 1340 94.26 94.22 94.31 94.37 1330 94.22 94.18 94.27 94.33 1320 94.18 94.14 94.24 94.30 1310 94.15 94.10 94.21 94.26 1300 94.11 94.07 94.16 94.22 1290 94.07 94.03 94.13 94.18 1280 94.02 93.99 94.08 94.13 1270 93.98 93.94 94.04 94.09 1260 93.94 93.89 93.99 94.04 1250 93.89 93.85 93.95 94.00 1240 93.84 93.80 93.90 93.95 1230 93.79 93.74 93.85 93.89 1220 93.74 93.69 93.80 93.85 1210 93.68 93.63 93.73 93.78 1200 93.61 93.57 93.67 93.72 1190 93.54 93.49 93.61 93.65 1180 93.47 93.43 93.53 93.58 1170 93.40 93.35 93.46 93.50 1160 93.34 93.28 93.40 93.43 1150 93.26 93.21 93.33 93.36 1140 93.18 93.13 93.24 93.28 1130 93.09 93.04 93.15 93.19 1120 93.00 92.93 93.06 93.09 1110 92.89 92.83 92.96 92.99 1100 92.78 92.71 92.85 92.87 1090 92.66 92.60 92.73 92.75 1080 92.52 92.46 92.61 92.62 1070 92.38 92.32 92.46 92.48 1060 92.23 92.17 92.31 92.33 1050 92.07 92.00 92.16 92.17 1040 91.89 91.83 91.98 91.99 1030 91.70 91.63 91.79 91.80 1020 91.48 91.42 91.58 91.59 1010 91.25 91.19 91.35 91.37 1000 91.00 90.95 91.10 91.10 990 90.71 90.65 90.82 90.82 980 90.41 90.35 90.51 90.51 970 90.06 90.00 90.18 90.18 960 89.68 89.63 89.79 89.80 950 89.25 89.21 89.37 89.37