# 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 2025-09-12 (1135 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 87.06 87.84 86.86 998 86.61 86.96 87.19 996 86.70 86.60 86.68 994 86.86 87.15 86.93 992 87.32 86.92 87.01 990 87.74 87.01 86.66 988 87.30 86.77 87.10 986 86.38 86.77 86.20 984 86.75 86.36 86.58 982 86.13 86.46 86.51 980 86.52 86.65 86.85 978 86.64 86.64 87.05 976 86.39 86.42 87.07 974 86.11 85.74 86.49 972 86.26 86.48 86.80 970 86.35 86.10 87.10 968 85.78 85.90 86.74 966 86.25 86.46 87.05 964 86.39 86.47 87.35 962 84.76 85.86 87.04 960 86.23 85.27 86.35 958 86.02 86.05 86.06 956 85.65 85.74 85.41 954 85.90 86.11 86.10 952 85.96 85.19 85.39 950 86.27 84.91 86.15 948 85.65 85.72 85.87 946 85.90 86.19 85.39 944 85.52 85.35 84.97 942 85.65 85.13 85.29 940 85.32 85.99 85.27 938 85.44 85.13 85.25 936 84.61 84.47 85.56 934 84.80 85.08 85.46 932 84.95 84.72 84.65 930 85.12 85.01 84.95 928 84.67 84.29 85.06 926 83.96 84.13 84.90 924 84.55 83.71 84.47 922 84.33 84.28 84.84 920 84.30 83.82 84.33 918 84.80 84.31 84.24 916 84.29 84.21 83.86 914 83.92 83.83 83.59 912 83.76 83.54 84.10 910 83.37 83.30 83.11 908 83.58 83.21 83.36 906 83.57 83.37 83.42 904 83.34 83.32 83.02 902 83.50 82.93 83.39 900 82.89 82.49 83.11 898 82.65 82.74 82.82 896 82.74 82.35 82.20 894 82.40 82.38 82.37 892 82.62 82.05 82.54 890 82.24 82.14 82.39 888 81.83 82.00 81.86 886 82.20 81.83 82.00 884 81.12 81.90 82.12 882 81.32 81.79 81.30 880 81.57 81.31 81.31 878 81.34 80.95 81.57 876 80.93 81.08 81.40 874 81.10 80.97 81.18 872 80.89 80.49 81.06 870 80.84 81.01 80.89 868 80.42 80.68 80.71 866 80.32 80.59 80.34 864 80.28 79.92 80.28 862 80.03 80.03 80.20 860 80.03 80.00 80.53 858 79.99 79.73 79.75 856 79.61 79.47 79.66 854 80.05 79.51 79.88 852 79.63 79.38 79.74 850 79.40 79.36 79.41 848 79.27 79.04 79.80 846 79.55 79.64 79.39 844 79.22 78.97 79.29 842 79.05 79.52 79.43 840 78.65 78.74 79.09 838 78.83 78.69 79.28 836 78.73 78.85 79.21 834 79.23 79.27 79.26 832 79.02 78.86 79.42 830 78.74 78.62 79.03 828 79.07 78.93 79.23 826 78.85 78.67 79.18 824 78.79 78.81 78.71 822 79.04 78.67 79.40 820 78.78 79.09 79.17 818 78.98 79.00 79.20 816 78.53 78.98 79.36 814 78.76 78.85 79.10 812 79.25 78.96 78.98 810 79.17 78.80 79.55 808 78.94 79.15 79.25 806 79.19 79.48 79.45 804 79.26 78.81 79.95 802 79.20 79.35 79.49 800 79.41 79.55 79.78 798 79.46 79.10 79.48 796 79.42 79.16 79.35 794 79.60 79.37 79.61 792 79.96 79.42 79.77 790 79.61 79.81 79.90 788 79.87 79.46 80.11 786 80.05 79.66 80.18 784 80.10 80.12 79.91 782 80.01 80.04 80.31 780 80.16 80.28 80.26 778 79.87 79.95 80.37 776 79.96 79.88 80.57 774 80.14 80.12 80.43 772 80.30 80.02 80.49 770 80.51 80.41 80.32 768 80.39 80.56 80.56 766 80.75 80.67 80.77 764 80.61 80.75 80.79 762 80.89 80.52 80.91 760 80.88 80.72 81.32 758 80.68 80.41 81.01 756 80.92 80.69 81.27 754 80.85 80.73 81.34 752 81.31 80.91 81.11 750 81.37 81.08 81.46 748 81.42 81.13 81.37 746 81.33 81.23 81.41 744 81.27 81.37 81.64 742 81.48 81.33 81.41 740 81.29 81.50 81.71 738 81.53 81.28 81.73 736 81.45 81.40 81.84 734 81.49 81.40 81.79 732 81.55 81.50 81.63 730 81.68 81.46 81.70 728 81.47 81.48 81.93 726 81.66 81.74 82.01 724 81.69 81.71 82.22 722 81.67 81.82 82.04 720 81.74 81.70 82.05 718 82.01 81.71 81.91 716 81.96 81.88 82.34 714 81.99 82.07 82.19 712 81.90 82.04 82.34 710 82.01 82.04 82.39 708 82.13 81.79 82.36 706 82.16 81.84 82.37 704 82.02 82.16 82.41 702 82.24 82.13 82.42 700 82.32 82.17 82.43 698 82.21 82.16 82.56 696 82.25 82.18 82.56 694 82.30 81.94 82.60 692 82.41 82.11 82.55 690 82.43 82.37 82.55 688 82.56 82.10 82.57 686 82.64 82.48 82.65 684 82.46 82.29 82.82 682 82.57 82.40 82.80 680 82.37 82.26 82.65 678 82.56 82.77 82.83 676 82.68 82.65 83.00 674 82.51 82.73 82.91 672 82.66 82.51 82.91 670 82.75 82.47 82.98 668 82.54 82.52 83.00 666 82.85 82.56 82.91 664 82.88 82.70 82.91 662 82.96 82.55 82.96 660 82.66 82.65 83.23 658 82.71 82.61 83.11 656 82.93 82.57 83.09 654 82.86 82.61 83.01 652 82.90 82.56 83.03 650 82.84 82.70 83.13 648 82.83 82.79 83.14 646 82.88 82.74 83.33 644 83.03 82.77 83.39 642 83.03 82.76 83.08 640 83.03 82.87 83.35 638 83.08 82.85 83.25 636 83.03 82.96 83.27 634 83.13 82.80 83.32 632 83.17 83.11 83.31 630 83.06 82.76 83.37 628 83.01 82.83 83.28 626 82.96 83.03 83.46 624 83.08 82.91 83.34 622 83.20 82.71 83.35 620 83.32 82.93 83.30 618 83.27 83.04 83.42 616 83.30 83.01 83.44 614 83.11 83.08 83.39 612 83.08 83.14 83.32 610 83.21 83.25 83.39 608 83.30 83.01 83.58 606 83.22 83.18 83.42 604 83.36 83.21 83.74 602 83.33 83.02 83.50 600 83.11 82.96 83.49 598 83.21 83.00 83.56 596 83.30 82.99 83.45 594 83.30 83.06 83.55 592 83.41 82.98 83.63 590 83.03 83.17 83.43 588 83.16 83.22 83.54 586 83.22 83.13 83.44 584 83.41 82.97 83.73 582 83.35 83.26 83.70 580 83.38 83.09 83.64 578 83.22 83.05 83.65 576 83.34 83.01 83.48 574 83.45 83.23 83.65 572 83.15 83.02 83.64 570 83.46 83.24 83.63 568 83.34 83.09 83.54 566 83.31 83.17 83.51 564 83.30 83.14 83.66 562 83.28 83.14 83.77 560 83.32 83.15 83.69 558 83.13 83.07 83.83 556 83.51 83.16 83.67 554 83.55 83.21 83.65 552 83.37 83.19 83.71 550 83.46 83.04 83.65 548 83.49 83.12 83.52 546 83.42 83.08 83.66 544 83.20 83.26 83.61 542 83.20 83.31 83.71 540 83.46 83.10 83.56 538 83.60 83.06 83.71 536 83.30 83.18 83.63 534 83.40 83.23 83.55 532 83.22 83.09 83.63 530 83.45 83.14 83.75 528 83.34 83.28 83.66 526 83.18 83.33 83.44 524 83.32 82.86 83.50 522 83.40 83.06 83.51 520 83.26 83.19 83.61 518 83.31 83.30 83.52 516 83.11 83.05 83.55 514 83.19 82.94 83.49 512 83.24 82.97 83.69 510 83.14 83.00 83.55 508 83.19 82.97 83.56 506 83.38 83.03 83.54 504 83.54 82.92 83.72 502 83.59 83.25 83.51 500 83.51 83.34 83.43 498 83.24 82.97 83.62 496 83.37 83.34 83.41 494 83.21 82.87 83.32 492 83.17 82.96 83.59 490 83.06 82.98 83.68 488 83.02 83.07 83.47 486 83.11 83.11 83.35 484 83.21 83.13 83.43 482 83.07 82.84 83.28 480 83.11 82.92 83.65 478 82.88 83.06 83.59 476 83.14 82.71 83.54 474 82.92 82.63 83.38 472 82.90 82.87 83.72 470 83.14 82.99 83.38 468 83.28 82.81 83.39 466 83.05 82.67 83.09 464 83.02 83.10 83.08 462 83.16 82.79 83.29 460 82.90 82.75 83.32 458 83.03 82.65 83.05 456 82.68 82.80 83.19 454 82.59 82.53 82.83 452 82.50 82.53 83.18 450 82.51 82.82 82.80 448 82.77 82.70 82.67 446 82.64 82.37 82.94 444 82.46 82.76 82.81 442 82.56 82.46 83.31 440 82.17 82.51 82.97 438 82.69 82.37 83.30 436 82.64 82.45 82.82 434 82.80 82.47 83.04 432 82.10 82.78 83.22 430 82.15 82.34 83.23 428 82.73 82.12 82.92 426 82.10 82.42 82.98 424 82.63 82.71 82.71 422 82.47 82.74 83.04 420 82.27 82.30 82.51 418 82.55 82.62 83.22 416 82.07 82.04 82.94 414 82.78 82.13 82.99 412 82.03 82.52 82.77 410 82.44 82.40 82.82 408 82.11 82.00 82.57 406 81.70 82.10 82.37 404 82.32 82.33 82.47 402 81.94 81.47 82.36 400 82.06 82.42 82.02 398 82.34 82.19 82.27 396 81.87 80.86 82.23 394 81.30 82.02 82.09 392 81.98 82.37 82.22 390 82.14 81.40 82.08 388 81.43 80.96 81.98 386 81.24 81.78 82.79 384 81.49 81.05 81.89 382 80.94 82.72 81.96 380 80.77 81.14 83.16 1650 91.53 91.38 91.56 1640 91.53 91.39 91.54 1630 91.54 91.40 91.57 1620 91.51 91.39 91.57 1610 91.54 91.41 91.56 1600 91.54 91.39 91.56 1590 91.54 91.39 91.55 1580 91.52 91.37 91.55 1570 91.50 91.36 91.53 1560 91.50 91.36 91.54 1550 91.48 91.34 91.51 1540 91.46 91.32 91.50 1530 91.45 91.32 91.48 1520 91.45 91.29 91.48 1510 91.41 91.28 91.47 1500 91.41 91.25 91.44 1490 91.38 91.24 91.41 1480 91.37 91.22 91.40 1470 91.34 91.19 91.37 1460 91.32 91.16 91.37 1450 91.29 91.15 91.34 1440 91.27 91.13 91.33 1430 91.26 91.10 91.30 1420 91.22 91.08 91.27 1410 91.21 91.04 91.26 1400 91.17 91.02 91.22 1390 91.15 91.00 91.20 1380 91.13 90.97 91.18 1370 91.09 90.95 91.15 1360 91.06 90.91 91.12 1350 91.03 90.88 91.09 1340 91.00 90.84 91.06 1330 90.97 90.80 91.04 1320 90.92 90.78 90.99 1310 90.89 90.74 90.96 1300 90.87 90.70 90.93 1290 90.82 90.67 90.88 1280 90.78 90.62 90.85 1270 90.74 90.59 90.82 1260 90.70 90.56 90.78 1250 90.66 90.51 90.73 1240 90.62 90.44 90.68 1230 90.57 90.40 90.64 1220 90.50 90.36 90.60 1210 90.45 90.30 90.54 1200 90.40 90.23 90.47 1190 90.33 90.18 90.41 1180 90.27 90.12 90.35 1170 90.20 90.04 90.29 1160 90.13 89.97 90.22 1150 90.05 89.90 90.14 1140 89.98 89.82 90.07 1130 89.89 89.73 89.98 1120 89.80 89.64 89.89 1110 89.71 89.54 89.79 1100 89.60 89.43 89.69 1090 89.48 89.30 89.57 1080 89.35 89.19 89.44 1070 89.21 89.06 89.30 1060 89.06 88.90 89.17 1050 88.90 88.73 89.02 1040 88.72 88.56 88.84 1030 88.56 88.39 88.64 1020 88.35 88.18 88.44 1010 88.10 87.96 88.21 1000 87.85 87.69 87.96 990 87.57 87.40 87.67 980 87.26 87.11 87.36 970 86.92 86.76 87.03 960 86.52 86.37 86.66 950 86.11 85.93 86.21