# Subaru Telescope Primary Mirror In-Situ Measured Reflectivity # Coated with Aluminum on 2022-08-04 # Opened the vacuum chamber on 2022-08-08 # Measured with Subaru Portable Spectrophotometer (SPS) on 2023-07-14 (344 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 92.68 91.41 91.93 998 92.09 91.93 91.58 996 91.16 92.52 92.23 994 91.63 92.07 92.54 992 93.00 91.42 91.25 990 92.54 91.77 91.88 988 92.07 92.18 93.10 986 92.00 91.98 91.54 984 91.91 91.79 92.20 982 91.31 92.34 92.13 980 91.86 91.72 91.62 978 91.72 91.71 91.90 976 91.22 91.29 91.60 974 91.09 91.53 92.05 972 91.58 92.21 91.49 970 91.35 91.84 92.01 968 90.97 91.56 91.37 966 91.06 90.98 91.25 964 91.54 91.15 90.66 962 91.67 91.25 91.40 960 90.60 91.30 91.62 958 91.61 90.84 90.93 956 90.60 90.62 90.83 954 90.94 90.98 90.97 952 90.63 91.08 90.69 950 90.57 90.31 91.01 948 90.62 90.55 90.22 946 90.44 90.97 90.97 944 89.96 90.60 91.08 942 90.59 90.45 89.87 940 90.12 90.05 90.91 938 90.70 90.70 90.76 936 90.21 90.31 90.86 934 90.27 90.23 90.43 932 89.99 89.50 90.51 930 89.92 89.44 90.15 928 89.72 89.57 89.93 926 89.41 89.55 89.45 924 89.14 89.35 89.88 922 89.15 89.39 89.40 920 89.35 89.04 89.75 918 89.12 88.83 88.53 916 88.64 88.80 89.21 914 88.61 89.14 89.10 912 88.69 89.18 88.95 910 88.99 88.72 88.32 908 88.58 88.39 88.47 906 88.16 88.32 88.51 904 88.20 88.07 88.14 902 88.08 88.16 88.20 900 88.32 88.28 87.96 898 87.74 88.13 88.20 896 87.73 87.50 87.75 894 87.51 87.31 87.51 892 87.47 86.98 87.55 890 87.15 87.24 87.20 888 86.79 86.71 87.31 886 87.11 87.03 86.87 884 86.55 86.47 86.93 882 86.44 86.47 86.91 880 86.56 86.42 86.51 878 86.23 86.34 86.97 876 86.21 86.48 86.65 874 86.29 85.97 86.44 872 86.14 86.14 86.13 870 85.87 85.54 86.02 868 86.04 85.65 85.63 866 85.57 85.84 85.68 864 85.31 85.51 85.22 862 85.34 84.91 85.35 860 85.17 84.92 85.35 858 85.39 84.85 85.42 856 84.93 84.30 85.08 854 84.97 84.08 84.94 852 85.08 84.24 84.66 850 84.16 84.60 84.21 848 84.41 84.75 84.79 846 84.81 84.54 84.37 844 84.39 83.96 84.43 842 84.35 84.45 84.30 840 84.64 84.15 84.71 838 84.08 83.94 84.34 836 83.93 83.79 83.98 834 83.85 84.02 84.13 832 84.02 84.25 83.77 830 84.10 83.52 84.09 828 83.97 83.45 84.03 826 83.98 84.09 83.86 824 84.00 84.03 84.43 822 84.34 83.96 84.00 820 83.82 83.97 83.81 818 83.89 84.47 83.74 816 84.15 84.14 84.42 814 84.63 83.77 84.26 812 84.34 83.84 84.12 810 84.49 84.08 84.21 808 84.45 84.34 84.74 806 84.15 84.28 84.75 804 84.23 83.97 84.68 802 84.03 84.38 84.78 800 84.50 84.17 84.47 798 84.81 84.39 84.90 796 84.96 84.51 84.56 794 84.64 84.60 84.77 792 84.81 84.65 84.72 790 84.74 84.93 85.18 788 84.79 84.43 85.09 786 84.63 84.77 84.83 784 85.35 85.14 84.85 782 85.15 84.76 85.21 780 85.10 85.28 85.14 778 84.85 85.29 85.14 776 85.30 85.24 85.27 774 85.29 85.37 85.62 772 85.47 85.48 85.67 770 85.58 85.91 85.73 768 85.99 85.61 85.68 766 85.63 86.01 86.32 764 85.77 86.04 85.81 762 86.17 85.58 85.94 760 86.52 85.89 86.37 758 86.20 85.85 86.41 756 86.09 86.23 86.02 754 86.22 86.09 86.35 752 86.39 86.20 86.55 750 86.41 86.31 86.00 748 86.40 86.23 86.47 746 86.65 86.45 86.58 744 86.49 86.12 86.55 742 86.65 86.78 87.01 740 86.75 86.54 86.80 738 87.05 86.66 86.73 736 86.74 86.45 86.86 734 86.78 87.02 86.88 732 86.96 86.73 86.97 730 87.31 86.76 86.95 728 87.18 86.88 87.10 726 86.92 86.85 87.31 724 87.03 87.10 87.17 722 87.42 87.28 87.48 720 87.18 87.09 87.39 718 87.28 87.05 87.58 716 87.47 87.64 87.32 714 87.53 87.39 87.60 712 87.51 87.35 87.42 710 87.75 87.58 87.71 708 87.74 87.54 87.45 706 87.55 87.61 87.60 704 87.67 87.67 87.64 702 87.67 87.43 87.70 700 88.00 87.55 87.89 698 87.62 87.56 87.70 696 87.52 87.76 87.93 694 87.71 88.01 87.70 692 87.79 87.56 87.96 690 87.88 88.11 88.16 688 87.85 87.84 88.09 686 88.23 87.77 88.17 684 88.10 87.85 88.29 682 87.89 87.68 88.06 680 88.23 87.98 88.15 678 87.94 88.02 88.44 676 88.07 88.28 88.27 674 88.54 88.20 88.26 672 88.40 88.17 88.23 670 88.30 88.33 88.19 668 88.42 88.50 88.43 666 88.52 88.45 88.64 664 88.34 88.23 88.47 662 88.49 88.40 88.36 660 88.35 88.24 88.44 658 88.59 88.42 88.40 656 88.49 88.56 88.71 654 88.58 88.46 88.54 652 88.72 88.49 88.55 650 88.54 88.51 88.93 648 88.62 88.40 88.64 646 88.76 88.42 88.78 644 88.75 88.62 88.82 642 88.97 88.69 88.93 640 88.83 88.92 88.81 638 88.72 88.65 88.75 636 88.84 88.69 88.99 634 88.92 88.91 88.85 632 88.72 89.00 88.96 630 88.94 88.74 89.08 628 88.84 88.76 88.89 626 88.81 88.78 89.12 624 88.96 88.93 89.24 622 89.12 88.85 88.97 620 89.06 88.95 89.14 618 89.05 89.05 89.19 616 89.40 88.92 89.07 614 89.13 88.95 89.15 612 89.29 89.06 89.03 610 89.16 89.03 89.21 608 89.22 89.01 89.17 606 89.26 89.11 89.19 604 89.15 89.23 89.26 602 89.22 89.38 89.29 600 89.34 89.16 89.19 598 89.37 88.99 89.44 596 89.35 89.14 89.26 594 89.17 89.11 89.48 592 89.35 89.28 89.42 590 89.46 89.24 89.37 588 89.41 89.34 89.40 586 89.62 89.26 89.19 584 89.20 89.42 89.61 582 89.51 89.14 89.47 580 89.69 89.25 89.70 578 89.42 89.43 89.58 576 89.34 89.38 89.46 574 89.31 89.41 89.25 572 89.53 89.10 89.40 570 89.65 89.35 89.50 568 89.67 89.43 89.64 566 89.50 89.38 89.62 564 89.54 89.50 89.76 562 89.44 89.33 89.56 560 89.57 89.64 89.62 558 89.48 89.49 89.62 556 89.34 89.51 89.68 554 89.76 89.47 89.56 552 89.65 89.50 89.57 550 89.54 89.54 89.73 548 89.79 89.55 89.67 546 89.70 89.54 89.70 544 89.38 89.58 89.51 542 89.64 89.58 89.61 540 89.80 89.62 89.47 538 89.65 89.62 89.76 536 89.70 89.56 89.75 534 89.67 89.58 89.85 532 89.83 89.55 89.95 530 89.74 89.45 89.66 528 89.64 89.50 89.74 526 89.91 89.60 89.83 524 89.93 89.68 89.72 522 89.81 89.71 89.62 520 89.80 89.76 89.88 518 89.78 89.67 89.79 516 89.63 89.80 90.02 514 89.69 89.94 89.84 512 89.85 89.92 89.70 510 89.79 89.62 89.67 508 89.85 89.69 89.99 506 89.84 89.72 89.81 504 89.88 89.74 89.91 502 89.85 89.55 90.12 500 89.80 89.80 90.09 498 89.95 89.62 89.60 496 90.17 89.90 89.90 494 89.91 89.91 89.96 492 90.01 89.86 89.96 490 89.65 89.91 89.92 488 89.96 89.91 89.77 486 89.75 89.77 89.79 484 90.07 89.80 90.00 482 90.08 89.86 89.93 480 90.01 89.97 89.89 478 90.21 89.59 89.99 476 89.98 89.80 90.03 474 89.88 89.76 89.87 472 89.78 89.91 89.96 470 89.98 89.81 90.18 468 90.25 89.92 90.01 466 89.69 89.76 90.22 464 89.93 89.96 90.00 462 90.15 90.05 89.95 460 89.99 89.60 90.20 458 90.08 89.97 90.06 456 89.95 89.93 89.64 454 90.03 90.08 89.84 452 89.91 89.64 89.79 450 89.70 90.00 89.94 448 90.02 89.62 89.56 446 89.89 90.02 89.98 444 90.06 89.65 90.25 442 89.86 90.04 90.05 440 89.86 90.02 90.19 438 90.11 89.99 90.06 436 90.26 90.26 90.61 434 90.38 89.99 90.31 432 90.05 89.98 90.11 430 90.44 89.89 89.97 428 89.96 90.37 90.30 426 90.23 90.27 89.89 424 90.42 90.26 90.51 422 90.51 90.62 90.09 420 90.13 90.12 90.31 418 90.21 90.25 90.33 416 90.43 90.13 90.16 414 89.81 90.31 90.41 412 90.26 90.39 90.07 410 89.90 90.16 89.76 408 90.37 89.89 90.12 406 89.44 89.95 90.32 404 90.13 90.43 90.30 402 90.14 89.92 90.18 400 90.38 90.26 90.50 398 90.25 89.76 90.16 396 90.43 89.59 90.74 394 90.05 90.40 90.07 392 89.95 90.31 90.03 390 89.48 90.01 89.65 388 90.10 90.26 90.39 386 90.39 90.06 90.15 384 90.65 90.05 90.47 382 89.94 91.12 90.15 380 90.65 89.97 90.35 1650 96.02 95.97 96.14 1640 96.02 95.97 96.16 1630 96.04 95.99 96.16 1620 96.04 95.99 96.17 1610 96.04 96.00 96.16 1600 96.04 95.99 96.16 1590 96.03 96.00 96.17 1580 96.03 95.98 96.16 1570 96.02 95.96 96.16 1560 96.01 95.97 96.15 1550 96.01 95.95 96.13 1540 95.98 95.95 96.12 1530 95.97 95.93 96.11 1520 95.97 95.91 96.10 1510 95.94 95.91 96.08 1500 95.93 95.90 96.08 1490 95.92 95.87 96.05 1480 95.90 95.86 96.04 1470 95.88 95.83 96.02 1460 95.87 95.82 96.01 1450 95.86 95.80 95.98 1440 95.84 95.79 95.97 1430 95.81 95.76 95.95 1420 95.80 95.75 95.93 1410 95.78 95.73 95.91 1400 95.76 95.71 95.88 1390 95.74 95.69 95.87 1380 95.72 95.66 95.84 1370 95.70 95.64 95.82 1360 95.68 95.62 95.80 1350 95.65 95.59 95.77 1340 95.62 95.57 95.75 1330 95.60 95.52 95.73 1320 95.56 95.51 95.70 1310 95.54 95.49 95.67 1300 95.52 95.45 95.64 1290 95.49 95.43 95.61 1280 95.46 95.40 95.58 1270 95.43 95.35 95.55 1260 95.39 95.32 95.51 1250 95.35 95.28 95.48 1240 95.32 95.24 95.43 1230 95.27 95.21 95.39 1220 95.23 95.16 95.35 1210 95.18 95.11 95.30 1200 95.13 95.06 95.25 1190 95.08 95.00 95.20 1180 95.01 94.95 95.14 1170 94.96 94.89 95.07 1160 94.90 94.81 95.01 1150 94.82 94.75 94.94 1140 94.75 94.68 94.87 1130 94.68 94.60 94.79 1120 94.59 94.52 94.71 1110 94.49 94.41 94.62 1100 94.40 94.31 94.52 1090 94.28 94.21 94.40 1080 94.16 94.09 94.28 1070 94.04 93.95 94.17 1060 93.92 93.82 94.01 1050 93.75 93.68 93.87 1040 93.59 93.51 93.69 1030 93.42 93.32 93.52 1020 93.21 93.13 93.32 1010 92.99 92.89 93.09 1000 92.74 92.67 92.85 990 92.48 92.39 92.58 980 92.18 92.10 92.27 970 91.86 91.75 91.95 960 91.48 91.39 91.58 950 91.05 90.98 91.17