# 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 2019-01-31 (468 days after, pre CO2 cleaning) # 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 90.44 90.48 89.69 90.39 998 90.15 89.54 90.10 89.03 996 89.35 90.05 89.56 89.80 994 89.82 90.61 89.85 89.10 992 89.75 90.16 89.54 89.56 990 89.08 89.80 90.08 89.45 988 89.32 88.94 90.30 89.45 986 90.10 89.73 89.89 88.78 984 89.68 89.63 89.78 90.18 982 89.59 89.41 88.60 88.86 980 89.77 89.21 89.51 88.83 978 89.72 88.89 88.95 89.09 976 89.54 88.86 89.61 89.13 974 89.76 89.23 89.28 89.52 972 89.62 89.07 89.48 89.55 970 89.12 89.02 88.86 88.65 968 89.98 88.43 88.49 89.14 966 89.19 89.66 88.48 88.75 964 88.88 89.17 89.08 89.03 962 89.01 88.79 88.19 88.31 960 88.57 88.77 88.93 88.66 958 89.16 88.82 88.14 88.49 956 88.24 88.38 88.56 87.84 954 88.80 88.88 88.47 88.47 952 88.01 88.62 88.52 88.75 950 88.41 88.23 87.88 88.04 948 88.09 88.02 88.62 88.33 946 88.54 88.66 88.83 88.35 944 88.74 88.22 88.40 88.38 942 88.21 87.99 87.85 88.16 940 87.83 88.05 87.83 87.79 938 88.25 88.10 87.93 87.80 936 87.82 87.73 88.18 87.93 934 87.84 87.79 87.97 87.65 932 87.97 87.03 87.99 87.37 930 87.37 87.85 87.14 87.19 928 87.48 87.46 87.45 86.92 926 87.63 87.05 87.32 87.10 924 87.34 87.38 86.87 87.30 922 87.43 87.16 86.77 86.77 920 87.05 86.88 86.93 86.87 918 86.58 86.85 86.68 86.83 916 86.92 86.94 86.55 86.65 914 86.67 86.60 86.69 86.27 912 86.41 86.40 86.33 86.36 910 86.63 86.38 86.26 85.83 908 86.20 86.38 86.25 86.08 906 86.49 86.40 86.23 85.74 904 86.40 86.02 85.77 85.92 902 85.91 85.48 85.26 85.45 900 85.92 85.71 85.48 85.43 898 85.34 85.67 85.73 85.61 896 85.57 85.56 85.31 85.43 894 85.56 85.36 85.24 85.30 892 85.06 85.11 85.06 84.79 890 85.08 85.42 84.71 85.23 888 85.07 84.61 85.01 84.74 886 84.40 84.65 84.49 84.66 884 84.20 84.50 84.63 84.55 882 84.43 84.39 84.50 83.82 880 84.18 84.04 83.92 84.05 878 83.91 84.24 84.31 83.58 876 83.94 84.12 83.85 83.96 874 83.61 83.45 83.82 83.66 872 83.73 83.62 83.92 83.66 870 83.31 83.61 83.52 83.10 868 83.44 83.09 83.50 83.18 866 82.95 83.29 83.07 83.09 864 83.16 83.35 83.02 82.78 862 82.78 82.93 82.97 82.84 860 82.98 82.64 82.85 82.62 858 82.87 82.90 82.83 82.79 856 82.67 82.50 82.79 82.49 854 82.37 82.18 82.46 81.91 852 82.03 82.03 82.34 81.99 850 81.87 82.12 81.82 82.00 848 82.19 82.04 82.36 81.75 846 82.03 81.89 82.00 81.98 844 81.93 81.85 81.83 81.92 842 82.08 81.88 81.86 82.04 840 81.57 81.43 81.66 81.96 838 82.01 81.72 81.89 81.79 836 81.56 81.44 81.80 81.16 834 81.83 81.68 81.80 81.16 832 81.42 81.50 81.47 81.58 830 81.74 81.51 81.43 81.39 828 81.31 81.72 81.65 81.44 826 81.58 81.35 81.77 81.38 824 81.45 81.51 81.53 81.39 822 81.35 81.43 81.64 81.51 820 81.65 81.24 81.48 81.20 818 81.60 81.50 81.24 81.05 816 81.68 81.69 81.20 81.10 814 81.52 81.65 81.25 81.33 812 81.64 81.69 81.58 81.49 810 81.65 81.29 81.06 81.41 808 81.63 81.63 81.51 81.12 806 81.65 81.81 81.58 81.67 804 81.94 81.79 81.40 81.21 802 81.70 81.52 81.62 81.63 800 81.85 81.71 81.85 81.69 798 81.65 81.76 81.56 81.60 796 81.92 82.11 81.92 81.74 794 81.97 82.07 81.84 82.14 792 82.07 82.18 81.99 81.74 790 82.47 81.96 82.11 81.82 788 82.29 81.98 82.26 82.18 786 82.21 82.52 82.55 82.16 784 82.54 82.21 82.36 82.01 782 82.26 82.27 82.48 82.06 780 82.57 82.53 82.54 82.72 778 82.57 82.53 82.71 82.44 776 82.61 82.56 82.48 82.13 774 82.65 82.65 82.67 82.43 772 82.70 82.56 82.96 82.59 770 82.80 83.08 82.62 82.42 768 82.78 82.90 82.73 82.67 766 82.81 82.82 82.85 82.79 764 83.04 83.08 83.00 82.90 762 83.37 83.13 83.14 82.82 760 83.21 82.94 83.17 83.12 758 83.10 83.24 83.25 82.97 756 83.40 83.26 83.21 83.04 754 83.26 83.31 83.35 83.23 752 83.44 83.34 83.36 83.42 750 83.47 83.82 83.57 83.11 748 83.55 83.82 83.56 83.40 746 83.59 83.45 83.60 83.48 744 83.61 83.69 83.69 83.38 742 83.72 83.76 83.60 83.70 740 83.80 83.76 83.81 83.87 738 83.82 83.58 83.68 83.62 736 83.94 83.90 84.21 83.59 734 83.88 84.25 83.86 83.73 732 84.09 84.04 84.07 83.80 730 83.75 84.05 84.04 83.82 728 84.13 84.06 84.13 83.96 726 84.25 84.05 84.21 84.09 724 84.26 84.19 84.21 83.97 722 84.20 84.10 84.12 84.04 720 84.18 84.39 84.04 84.03 718 84.46 84.32 84.60 84.08 716 84.32 84.32 84.16 84.20 714 84.18 84.65 84.45 84.12 712 84.30 84.44 84.64 84.01 710 84.56 84.60 84.34 84.15 708 84.62 84.67 84.31 84.46 706 84.56 84.60 84.47 84.30 704 84.51 84.51 84.47 84.29 702 84.58 84.52 84.61 84.60 700 84.59 84.48 84.83 84.45 698 84.78 84.81 84.72 84.48 696 84.68 84.92 84.70 84.55 694 84.78 84.88 84.77 84.80 692 84.83 84.84 84.80 84.81 690 84.88 84.78 85.01 84.76 688 84.86 84.86 84.67 84.64 686 85.04 84.78 84.84 84.65 684 85.01 84.74 84.81 84.79 682 84.91 84.71 84.80 84.81 680 84.85 85.03 85.01 84.85 678 85.16 85.22 84.94 84.90 676 85.08 84.87 85.11 85.01 674 84.92 84.98 85.08 84.90 672 85.29 85.02 85.07 84.98 670 85.19 85.22 85.06 84.85 668 85.10 85.06 85.18 84.94 666 85.41 85.29 85.14 85.13 664 85.13 85.25 85.25 85.12 662 85.21 85.28 85.33 84.94 660 85.28 85.30 85.17 84.91 658 85.43 85.33 85.04 85.14 656 85.31 85.28 85.31 85.24 654 85.29 85.38 85.42 85.28 652 85.43 85.38 85.31 85.28 650 85.34 85.61 85.29 85.16 648 85.35 85.36 85.18 85.31 646 85.50 85.58 85.36 85.45 644 85.44 85.73 85.18 85.12 642 85.54 85.48 85.64 85.22 640 85.48 85.48 85.37 85.26 638 85.49 85.54 85.51 85.25 636 85.58 85.50 85.45 85.28 634 85.50 85.57 85.55 85.33 632 85.53 85.65 85.68 85.44 630 85.57 85.68 85.75 85.37 628 85.57 85.62 85.55 85.33 626 85.58 85.50 85.53 85.35 624 85.51 85.64 85.55 85.40 622 85.69 85.71 85.58 85.40 620 85.70 85.74 85.77 85.58 618 85.43 85.68 85.70 85.23 616 85.84 85.84 85.57 85.42 614 85.57 85.54 85.69 85.51 612 85.86 85.58 85.67 85.49 610 85.71 85.77 85.44 85.66 608 85.87 85.67 85.74 85.50 606 85.79 85.75 85.77 85.50 604 85.73 85.72 85.57 85.74 602 85.71 85.68 85.71 85.57 600 85.60 85.85 85.83 85.66 598 85.86 85.90 85.76 85.54 596 85.60 85.86 85.58 85.56 594 85.79 85.77 85.91 85.47 592 85.95 85.91 85.80 85.81 590 85.77 85.74 85.76 85.54 588 85.88 85.86 85.60 85.73 586 85.81 85.90 85.52 85.67 584 85.80 85.93 85.79 85.64 582 85.80 85.76 85.93 85.70 580 85.82 85.91 85.66 85.74 578 85.70 85.71 85.82 85.67 576 85.76 85.59 85.73 85.68 574 85.69 85.83 85.79 85.73 572 85.76 85.93 85.68 85.72 570 85.77 86.01 85.62 85.64 568 86.04 85.93 86.00 85.75 566 85.76 85.90 86.09 85.82 564 85.86 85.81 85.87 85.68 562 85.98 85.89 85.90 85.53 560 85.78 85.76 85.91 85.78 558 85.94 85.88 85.67 85.71 556 86.07 85.88 85.78 85.83 554 85.90 85.86 86.01 85.89 552 85.76 85.76 85.97 85.76 550 85.87 85.96 85.67 85.87 548 85.79 85.91 85.62 85.46 546 85.81 85.71 85.72 85.61 544 85.85 85.75 85.82 85.66 542 85.97 85.66 85.74 85.61 540 85.85 85.93 85.87 85.79 538 85.84 85.99 85.72 85.51 536 85.67 85.87 85.79 85.83 534 85.71 85.71 85.98 85.75 532 85.74 85.69 85.70 85.65 530 85.88 85.58 85.66 85.72 528 85.99 85.78 85.75 85.61 526 85.80 85.88 86.01 85.55 524 85.75 85.69 85.74 85.61 522 85.67 85.76 85.80 85.67 520 85.72 85.72 85.74 85.73 518 85.72 85.69 85.82 85.90 516 85.82 85.74 85.68 85.70 514 85.85 85.72 85.71 85.64 512 85.96 85.69 85.80 85.75 510 85.78 85.84 85.70 85.50 508 85.59 85.75 85.85 85.59 506 85.49 85.69 85.73 85.46 504 85.71 85.88 85.84 85.77 502 85.87 85.74 85.90 85.47 500 86.05 85.67 85.77 85.51 498 85.66 85.60 85.41 85.44 496 85.75 85.76 85.71 85.69 494 85.55 85.78 85.76 85.75 492 85.91 85.69 85.63 85.69 490 85.64 85.59 85.47 85.69 488 85.83 85.60 85.66 85.37 486 85.64 85.79 85.56 85.49 484 85.59 85.81 85.74 85.63 482 85.71 85.76 85.89 85.69 480 85.60 85.47 85.88 85.63 478 86.00 85.89 85.61 85.41 476 85.70 85.47 85.55 85.63 474 85.67 85.53 85.62 85.59 472 85.41 85.52 85.50 85.31 470 85.66 85.73 85.49 85.57 468 85.54 85.61 85.33 85.42 466 85.62 85.33 85.63 85.35 464 85.54 85.58 85.34 85.48 462 85.45 85.50 85.53 85.33 460 85.51 85.62 85.55 85.49 458 85.61 85.40 85.45 85.67 456 85.56 85.48 85.64 85.21 454 85.39 85.64 85.70 85.32 452 85.67 85.24 85.70 85.29 450 85.87 85.25 85.44 85.39 448 85.49 85.40 85.34 85.54 446 85.54 85.84 85.71 85.33 444 85.73 85.40 85.66 85.46 442 85.45 85.09 85.33 85.28 440 85.46 85.43 85.39 85.27 438 85.58 85.14 85.21 85.64 436 85.29 85.03 85.63 85.04 434 85.56 85.08 85.60 85.38 432 85.50 85.35 85.50 85.34 430 85.78 85.22 85.47 85.55 428 85.45 85.10 85.09 85.47 426 85.58 85.51 85.52 85.03 424 85.22 85.99 85.88 85.12 422 85.55 85.21 85.71 85.40 420 85.06 85.15 85.11 85.79 418 85.52 85.46 85.26 85.00 416 85.45 85.14 84.99 85.08 414 85.56 85.96 84.98 85.36 412 85.29 85.36 85.36 85.22 410 85.29 85.71 85.09 85.74 408 85.07 84.69 85.59 85.43 406 85.80 85.04 84.93 85.27 404 85.77 85.29 85.01 84.90 402 85.62 84.93 85.00 85.04 400 85.36 85.45 84.96 84.99 398 84.55 84.96 85.06 85.32 396 85.04 84.83 85.35 85.48 394 85.73 84.44 85.01 85.32 392 85.93 85.08 84.86 84.53 390 85.45 85.15 84.82 84.56 388 85.32 84.95 85.51 84.49 386 85.83 84.69 85.89 84.59 384 85.50 84.44 84.73 85.37 382 85.08 85.08 84.19 84.64 380 85.33 84.82 86.18 84.77 1650 94.56 94.73 94.47 94.43 1640 94.55 94.74 94.47 94.43 1630 94.56 94.75 94.48 94.44 1620 94.55 94.73 94.48 94.43 1610 94.56 94.74 94.47 94.43 1600 94.55 94.73 94.46 94.43 1590 94.54 94.72 94.45 94.42 1580 94.53 94.71 94.44 94.40 1570 94.52 94.69 94.42 94.39 1560 94.50 94.68 94.41 94.38 1550 94.49 94.66 94.40 94.35 1540 94.47 94.64 94.38 94.34 1530 94.45 94.62 94.35 94.32 1520 94.44 94.61 94.33 94.31 1510 94.42 94.59 94.31 94.28 1500 94.40 94.56 94.29 94.25 1490 94.38 94.54 94.27 94.22 1480 94.35 94.51 94.24 94.21 1470 94.33 94.50 94.22 94.18 1460 94.30 94.47 94.19 94.16 1450 94.28 94.44 94.16 94.12 1440 94.24 94.41 94.13 94.09 1430 94.22 94.38 94.11 94.07 1420 94.20 94.36 94.08 94.04 1410 94.17 94.33 94.06 94.02 1400 94.15 94.31 94.02 93.99 1390 94.12 94.27 94.00 93.97 1380 94.08 94.24 93.96 93.93 1370 94.02 94.19 93.90 93.87 1360 93.98 94.14 93.86 93.83 1350 93.94 94.10 93.82 93.78 1340 93.90 94.05 93.79 93.75 1330 93.86 94.02 93.74 93.71 1320 93.83 93.99 93.71 93.67 1310 93.79 93.94 93.67 93.63 1300 93.75 93.91 93.63 93.59 1290 93.70 93.86 93.59 93.55 1280 93.66 93.81 93.56 93.51 1270 93.62 93.77 93.51 93.47 1260 93.57 93.73 93.46 93.42 1250 93.52 93.68 93.42 93.37 1240 93.47 93.63 93.36 93.32 1230 93.41 93.58 93.31 93.27 1220 93.36 93.52 93.26 93.21 1210 93.30 93.45 93.20 93.16 1200 93.23 93.39 93.14 93.09 1190 93.17 93.32 93.07 93.02 1180 93.08 93.24 93.00 92.94 1170 93.01 93.17 92.93 92.87 1160 92.93 93.11 92.85 92.79 1150 92.86 93.02 92.78 92.72 1140 92.78 92.94 92.70 92.64 1130 92.68 92.84 92.60 92.54 1120 92.58 92.74 92.50 92.45 1110 92.48 92.63 92.40 92.33 1100 92.37 92.51 92.29 92.22 1090 92.24 92.39 92.16 92.09 1080 92.11 92.25 92.03 91.96 1070 91.96 92.10 91.88 91.81 1060 91.81 91.95 91.74 91.65 1050 91.65 91.78 91.57 91.49 1040 91.47 91.60 91.38 91.30 1030 91.28 91.40 91.19 91.11 1020 91.06 91.18 90.98 90.89 1010 90.83 90.94 90.75 90.66 1000 90.57 90.68 90.48 90.41 990 90.30 90.40 90.21 90.12 980 89.97 90.09 89.90 89.80 970 89.64 89.74 89.55 89.46 960 89.25 89.36 89.17 89.08 950 88.83 88.92 88.74 88.65