# 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 2025-12-18 (1310 days after) # Measured two 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 1000 86.79 86.31 998 86.31 86.13 996 86.79 85.53 994 86.90 86.85 992 86.52 86.30 990 86.20 87.03 988 86.03 87.28 986 86.82 87.49 984 86.02 85.87 982 86.79 86.85 980 86.46 86.89 978 86.67 86.93 976 85.99 85.90 974 85.84 86.18 972 86.51 86.67 970 85.92 86.10 968 85.88 86.43 966 85.62 86.35 964 85.97 85.81 962 85.32 86.28 960 85.57 85.71 958 85.21 85.68 956 85.32 85.96 954 85.69 85.73 952 84.86 85.20 950 84.87 85.38 948 85.18 85.25 946 85.17 85.33 944 85.12 85.07 942 84.65 85.03 940 84.67 85.53 938 84.89 84.66 936 85.60 84.75 934 84.19 84.59 932 84.68 84.24 930 84.18 84.15 928 84.32 84.91 926 84.02 83.85 924 84.12 84.03 922 83.68 83.81 920 83.95 83.45 918 84.10 83.57 916 83.57 83.85 914 83.35 83.74 912 83.41 83.27 910 82.99 83.45 908 83.11 83.36 906 82.62 83.24 904 82.89 83.06 902 82.57 82.50 900 82.60 82.51 898 82.36 82.61 896 82.09 82.40 894 82.24 82.28 892 81.80 81.98 890 81.85 82.07 888 81.36 81.61 886 81.58 81.44 884 81.43 81.46 882 80.88 81.13 880 81.08 81.05 878 80.78 80.91 876 80.50 80.81 874 80.67 80.56 872 80.60 80.55 870 80.07 80.22 868 80.12 80.28 866 80.37 79.70 864 79.47 80.14 862 79.27 79.61 860 79.59 79.93 858 79.75 79.41 856 79.30 79.29 854 79.39 79.20 852 79.35 79.52 850 78.75 79.15 848 78.54 79.41 846 78.88 78.84 844 78.59 78.87 842 78.55 78.85 840 78.34 78.46 838 78.81 78.41 836 78.52 78.79 834 78.52 78.39 832 78.25 78.72 830 78.43 78.44 828 78.63 78.66 826 77.99 78.67 824 78.48 78.46 822 78.25 78.41 820 78.33 78.36 818 78.19 78.42 816 78.39 78.33 814 78.85 78.42 812 78.72 78.50 810 78.61 78.56 808 78.32 78.56 806 78.43 78.38 804 78.49 78.55 802 78.75 78.86 800 79.00 78.88 798 79.20 78.71 796 78.87 79.27 794 78.88 79.31 792 79.03 79.40 790 79.36 79.57 788 78.99 79.30 786 79.11 79.45 784 79.48 79.41 782 79.39 79.51 780 79.53 79.76 778 79.57 79.68 776 79.60 79.69 774 79.78 79.83 772 79.94 79.90 770 79.80 80.01 768 79.57 80.16 766 79.90 80.09 764 80.13 80.28 762 80.31 80.10 760 80.19 80.25 758 80.24 80.39 756 80.48 80.39 754 80.44 80.47 752 80.44 80.55 750 80.57 80.63 748 80.49 80.93 746 80.69 80.58 744 80.80 80.73 742 80.65 80.93 740 80.70 80.95 738 80.80 81.04 736 80.93 81.03 734 80.97 81.38 732 80.80 80.99 730 81.13 81.39 728 81.09 81.16 726 81.43 81.49 724 81.24 81.42 722 81.24 81.38 720 81.18 81.39 718 81.24 81.41 716 81.41 81.63 714 81.45 81.45 712 81.33 81.63 710 81.31 81.83 708 81.42 81.71 706 81.23 81.55 704 81.38 81.85 702 81.54 81.69 700 81.78 81.79 698 81.89 81.98 696 81.64 82.01 694 81.74 82.10 692 81.65 81.98 690 81.78 82.05 688 81.70 81.95 686 81.89 82.17 684 81.86 82.00 682 81.87 82.19 680 82.09 82.17 678 81.82 81.97 676 82.26 81.84 674 82.04 82.14 672 81.92 82.02 670 82.07 82.06 668 82.04 82.27 666 82.22 82.39 664 81.96 82.16 662 82.27 82.26 660 82.01 82.25 658 82.24 82.15 656 82.17 82.38 654 82.21 82.47 652 82.30 82.51 650 82.19 82.28 648 82.29 82.40 646 82.36 82.53 644 82.30 82.37 642 82.32 82.40 640 82.26 82.48 638 82.33 82.54 636 82.51 82.58 634 82.33 82.57 632 82.42 82.60 630 82.37 82.59 628 82.40 82.58 626 82.39 82.56 624 82.46 82.77 622 82.36 82.69 620 82.39 82.74 618 82.28 82.65 616 82.46 82.66 614 82.44 82.78 612 82.39 82.72 610 82.55 82.70 608 82.54 82.78 606 82.68 82.86 604 82.66 83.00 602 82.44 82.67 600 82.39 82.91 598 82.50 82.53 596 82.46 82.79 594 82.55 82.83 592 82.45 82.67 590 82.51 82.78 588 82.38 82.70 586 82.40 82.77 584 82.77 82.70 582 82.47 82.81 580 82.59 82.84 578 82.79 82.71 576 82.63 82.86 574 82.63 82.74 572 82.59 82.82 570 82.48 82.70 568 82.61 82.80 566 82.43 82.73 564 82.53 82.68 562 82.67 83.04 560 82.50 82.69 558 82.45 82.81 556 82.51 82.81 554 82.52 82.76 552 82.39 82.64 550 82.59 82.68 548 82.49 82.69 546 82.51 82.95 544 82.40 82.80 542 82.54 82.99 540 82.45 82.65 538 82.31 82.63 536 82.60 82.71 534 82.65 82.84 532 82.41 82.68 530 82.52 82.72 528 82.39 82.54 526 82.45 82.66 524 82.44 82.61 522 82.30 82.70 520 82.41 82.64 518 82.58 82.63 516 82.35 82.70 514 82.22 82.56 512 82.29 82.82 510 82.33 82.39 508 82.13 82.77 506 82.42 82.61 504 82.33 82.60 502 82.33 82.63 500 81.99 82.49 498 82.11 82.54 496 82.26 82.61 494 82.15 82.71 492 82.18 82.51 490 82.26 82.65 488 82.19 82.55 486 82.10 82.55 484 81.95 82.59 482 82.03 82.58 480 81.93 82.29 478 81.82 82.33 476 82.07 82.23 474 81.95 82.62 472 81.65 82.51 470 81.87 81.84 468 81.92 82.49 466 81.67 82.34 464 81.85 82.33 462 81.84 82.19 460 81.58 82.17 458 81.62 82.24 456 81.33 82.02 454 81.67 82.17 452 81.61 82.15 450 81.30 81.83 448 81.27 81.85 446 81.86 82.37 444 81.60 81.83 442 80.89 81.87 440 81.33 82.29 438 81.46 82.29 436 81.04 82.27 434 81.37 81.78 432 81.49 81.70 430 81.73 81.53 428 81.23 82.06 426 80.99 81.95 424 80.78 81.79 422 81.03 81.48 420 81.21 81.51 418 81.07 81.87 416 80.81 82.32 414 80.79 81.46 412 81.29 81.31 410 80.54 81.83 408 80.82 81.46 406 81.19 81.21 404 81.34 81.05 402 80.12 81.05 400 80.64 80.84 398 80.19 81.20 396 81.56 80.94 394 80.41 80.63 392 79.62 81.39 390 80.29 80.24 388 80.33 80.49 386 79.99 81.12 384 80.15 80.96 382 79.66 80.42 380 80.20 80.04 1650 91.25 91.03 1640 91.26 91.04 1630 91.26 91.05 1620 91.26 91.05 1610 91.26 91.05 1600 91.24 91.04 1590 91.25 91.04 1580 91.22 91.03 1570 91.21 91.03 1560 91.20 91.01 1550 91.19 91.01 1540 91.17 90.99 1530 91.16 90.97 1520 91.13 90.96 1510 91.11 90.94 1500 91.10 90.92 1490 91.07 90.92 1480 91.03 90.88 1470 91.02 90.87 1460 90.99 90.84 1450 90.97 90.83 1440 90.95 90.80 1430 90.92 90.77 1420 90.89 90.76 1410 90.87 90.74 1400 90.84 90.71 1390 90.82 90.68 1380 90.79 90.66 1370 90.75 90.64 1360 90.71 90.60 1350 90.69 90.59 1340 90.66 90.54 1330 90.62 90.52 1320 90.59 90.49 1310 90.55 90.45 1300 90.50 90.42 1290 90.47 90.39 1280 90.43 90.34 1270 90.39 90.32 1260 90.34 90.27 1250 90.30 90.22 1240 90.24 90.18 1230 90.20 90.14 1220 90.14 90.08 1210 90.08 90.03 1200 90.03 89.98 1190 89.96 89.92 1180 89.88 89.84 1170 89.82 89.79 1160 89.74 89.71 1150 89.66 89.64 1140 89.59 89.56 1130 89.51 89.48 1120 89.40 89.39 1110 89.29 89.28 1100 89.19 89.18 1090 89.07 89.08 1080 88.94 88.93 1070 88.78 88.80 1060 88.64 88.67 1050 88.49 88.51 1040 88.31 88.33 1030 88.11 88.13 1020 87.90 87.94 1010 87.67 87.70 1000 87.42 87.45 990 87.13 87.16 980 86.81 86.86 970 86.47 86.51 960 86.08 86.12 950 85.63 85.69