# 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 2023-10-05 (427 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 91.76 91.81 91.25 998 92.19 91.36 91.29 996 90.75 91.02 91.92 994 90.97 91.70 91.84 992 90.38 92.07 91.42 990 91.37 92.15 91.74 988 91.27 92.06 91.66 986 91.15 90.85 91.12 984 91.51 91.42 91.50 982 91.53 91.08 91.10 980 91.20 91.83 91.12 978 91.71 90.90 91.67 976 90.95 90.42 91.19 974 91.41 91.58 90.55 972 90.72 91.97 91.44 970 91.09 91.34 90.66 968 91.27 90.36 90.60 966 89.84 91.20 90.73 964 90.37 90.30 90.96 962 91.00 91.47 90.06 960 91.08 90.89 90.88 958 90.90 90.49 90.37 956 90.30 89.78 90.66 954 90.62 90.20 90.39 952 90.87 90.54 90.51 950 90.39 90.32 90.16 948 90.07 90.42 90.35 946 90.06 90.77 90.68 944 89.74 89.99 90.03 942 89.74 90.37 89.76 940 89.68 89.69 90.37 938 89.92 89.68 89.76 936 89.64 89.35 89.64 934 89.34 89.34 89.77 932 89.09 89.31 89.37 930 88.86 89.63 90.01 928 89.23 89.12 89.40 926 88.75 89.35 88.91 924 88.66 89.18 88.81 922 88.60 89.05 88.79 920 88.24 88.44 88.49 918 87.95 88.54 88.59 916 88.65 88.04 88.89 914 88.43 88.59 88.01 912 88.11 88.16 88.09 910 88.08 88.14 88.38 908 88.05 87.44 88.14 906 87.49 88.20 87.80 904 88.07 87.73 87.79 902 87.29 87.28 87.76 900 87.77 87.94 87.86 898 87.32 87.14 86.97 896 87.28 87.40 87.40 894 87.07 87.06 86.88 892 86.91 86.70 86.78 890 86.52 86.90 87.06 888 86.70 86.50 86.83 886 86.57 86.31 86.17 884 86.16 86.44 86.35 882 86.16 85.95 86.20 880 85.58 85.77 86.45 878 85.79 86.06 85.83 876 85.86 85.58 85.31 874 85.38 85.51 85.28 872 85.25 85.26 85.52 870 85.20 84.99 85.60 868 85.07 85.30 84.74 866 84.90 85.19 84.92 864 84.68 84.99 84.74 862 84.56 84.66 84.58 860 84.62 84.33 84.69 858 84.35 84.44 84.23 856 84.41 84.24 84.74 854 84.05 84.36 84.61 852 83.86 83.86 83.90 850 83.75 84.26 83.79 848 83.95 83.98 83.87 846 84.25 83.76 84.09 844 83.85 83.97 83.69 842 83.70 83.51 83.91 840 83.54 83.60 83.63 838 83.78 83.94 84.60 836 83.64 83.39 83.63 834 83.47 83.76 83.73 832 83.62 83.54 83.76 830 83.48 83.72 83.54 828 83.49 83.49 83.85 826 83.12 83.19 83.25 824 83.35 83.69 83.39 822 83.56 83.35 83.61 820 83.39 83.96 83.70 818 83.16 83.46 84.01 816 83.71 83.53 84.08 814 83.52 84.04 83.80 812 83.74 83.73 83.95 810 83.48 83.43 83.74 808 83.95 83.70 83.60 806 83.85 84.13 84.02 804 84.09 83.83 83.74 802 84.05 84.07 83.97 800 83.89 84.34 84.23 798 84.18 84.25 83.95 796 84.34 84.12 84.24 794 84.04 84.49 84.76 792 84.42 84.24 84.58 790 84.79 84.55 84.94 788 84.32 84.82 84.66 786 84.27 84.74 84.58 784 84.54 84.59 84.87 782 84.35 84.71 84.56 780 84.95 84.60 84.91 778 85.03 84.67 85.06 776 84.91 84.87 85.19 774 85.08 85.08 85.28 772 85.18 84.94 85.15 770 85.13 84.97 84.99 768 85.37 85.21 85.38 766 85.32 85.39 85.20 764 85.35 85.32 85.15 762 85.50 85.47 85.35 760 85.53 85.58 85.58 758 85.67 85.76 85.83 756 85.40 85.80 85.71 754 85.65 85.90 85.85 752 85.59 86.07 85.66 750 85.69 85.86 85.72 748 86.00 85.58 86.16 746 86.07 86.06 86.26 744 86.33 85.99 86.22 742 86.17 86.25 86.37 740 86.27 86.37 86.60 738 86.24 86.21 86.17 736 86.49 86.46 86.19 734 86.37 86.50 86.42 732 86.33 86.43 86.49 730 86.32 86.38 86.74 728 86.48 86.65 86.41 726 86.67 86.34 86.66 724 86.56 86.68 86.69 722 86.79 86.54 86.75 720 86.65 86.88 86.52 718 86.73 86.56 86.90 716 86.62 86.76 86.89 714 87.03 86.82 86.97 712 86.76 86.92 86.91 710 86.65 87.10 86.97 708 86.78 86.93 86.92 706 87.10 87.00 87.39 704 87.22 87.21 87.31 702 87.03 86.73 87.37 700 87.17 87.15 87.13 698 87.35 87.38 87.33 696 87.14 87.22 87.46 694 87.28 87.47 87.43 692 87.38 87.27 87.46 690 87.52 87.39 87.51 688 87.46 87.57 87.47 686 87.50 87.34 87.74 684 87.52 87.63 87.52 682 87.31 87.43 87.61 680 87.42 87.50 87.69 678 87.59 87.43 87.47 676 87.48 87.77 87.79 674 87.62 87.53 87.60 672 87.66 87.68 87.70 670 87.77 87.68 88.02 668 87.59 87.91 87.85 666 87.63 87.75 87.74 664 87.49 87.81 87.83 662 87.69 87.81 88.01 660 87.70 87.70 88.15 658 87.84 87.84 88.05 656 88.05 87.85 87.93 654 87.78 88.02 88.14 652 87.95 87.90 88.06 650 87.95 87.98 88.25 648 88.05 88.04 88.11 646 88.20 87.90 88.36 644 88.23 88.03 88.09 642 88.15 88.14 88.10 640 88.11 88.04 88.15 638 88.09 88.14 88.26 636 88.28 88.24 88.30 634 88.24 88.49 88.34 632 88.28 88.28 88.49 630 88.26 88.18 88.60 628 88.25 88.11 88.37 626 88.25 88.19 88.24 624 88.35 88.23 88.52 622 88.34 88.18 88.47 620 88.27 88.50 88.33 618 88.47 88.30 88.38 616 88.31 88.51 88.46 614 88.42 88.28 88.57 612 88.29 88.34 88.57 610 88.51 88.38 88.71 608 88.30 88.57 88.53 606 88.39 88.67 88.70 604 88.35 88.44 88.54 602 88.40 88.36 88.63 600 88.32 88.40 88.52 598 88.46 88.38 88.53 596 88.59 88.42 88.51 594 88.51 88.66 88.58 592 88.26 88.49 88.64 590 88.45 88.60 88.75 588 88.51 88.63 88.84 586 88.75 88.48 88.67 584 89.14 88.96 88.50 582 88.46 88.65 88.73 580 88.67 88.64 88.60 578 88.68 88.61 88.72 576 88.62 88.68 88.74 574 88.65 88.62 88.67 572 88.60 88.88 88.84 570 88.67 88.77 88.79 568 88.66 88.75 88.68 566 88.64 88.63 88.85 564 88.91 88.49 88.89 562 88.68 88.77 88.87 560 88.52 88.71 88.85 558 88.76 88.70 88.75 556 88.75 88.89 88.81 554 88.80 88.73 88.97 552 88.77 88.99 88.77 550 88.64 88.87 88.75 548 88.77 88.76 88.95 546 88.96 88.68 89.00 544 88.91 88.95 88.80 542 88.77 88.93 89.16 540 88.76 88.81 89.03 538 88.81 89.00 88.93 536 89.07 88.94 88.81 534 88.79 88.65 88.99 532 88.73 88.93 88.97 530 88.97 88.71 88.98 528 88.99 88.96 89.10 526 88.84 88.91 89.02 524 89.05 88.70 88.87 522 88.98 88.83 89.02 520 88.71 88.65 89.28 518 88.94 89.19 88.99 516 88.98 88.98 88.97 514 88.98 88.92 88.96 512 88.70 88.82 89.15 510 88.76 88.96 89.00 508 89.04 89.12 89.17 506 88.95 89.09 89.11 504 89.09 89.11 89.24 502 89.04 89.10 89.05 500 88.86 88.82 89.03 498 88.83 89.01 89.00 496 88.90 89.12 88.91 494 89.05 89.16 89.04 492 88.89 88.81 89.27 490 88.79 89.13 89.03 488 89.09 89.16 89.24 486 88.94 89.16 89.12 484 89.01 89.05 88.84 482 88.95 89.11 88.94 480 88.80 89.25 89.15 478 89.12 88.93 89.23 476 88.67 89.01 88.80 474 88.92 88.95 89.29 472 88.96 88.87 89.39 470 88.88 89.04 88.99 468 89.41 89.14 88.85 466 89.19 88.63 89.04 464 88.90 88.97 89.21 462 88.69 89.10 89.15 460 89.15 88.85 89.13 458 88.70 88.96 89.06 456 88.72 89.10 88.76 454 89.14 89.07 89.03 452 88.73 89.02 88.60 450 88.88 88.86 88.77 448 89.14 89.00 89.10 446 88.95 89.08 89.25 444 88.86 88.91 89.00 442 88.70 89.34 89.08 440 88.97 89.21 88.86 438 89.13 89.25 89.28 436 88.96 89.19 89.20 434 88.78 89.36 88.99 432 88.97 89.30 89.10 430 89.15 88.70 89.61 428 88.96 89.37 89.44 426 88.48 89.08 89.73 424 89.04 89.33 88.81 422 88.71 88.97 89.13 420 88.78 88.79 89.69 418 88.60 89.13 89.54 416 88.98 88.92 89.18 414 88.92 89.18 89.27 412 88.71 88.93 89.05 410 88.57 89.18 89.36 408 88.75 88.59 88.89 406 88.80 88.90 88.94 404 88.89 89.07 89.11 402 89.23 89.29 89.41 400 88.89 88.89 89.27 398 89.13 88.91 88.78 396 88.41 88.86 89.50 394 88.29 88.67 89.55 392 88.65 88.54 89.10 390 88.62 89.47 89.38 388 88.86 87.99 89.70 386 89.42 89.10 88.91 384 89.16 88.91 88.60 382 88.52 89.34 88.37 380 89.89 89.70 89.04 1650 95.62 95.64 95.59 1640 95.62 95.66 95.62 1630 95.64 95.66 95.61 1620 95.64 95.65 95.60 1610 95.64 95.65 95.63 1600 95.65 95.68 95.62 1590 95.63 95.65 95.62 1580 95.62 95.65 95.60 1570 95.62 95.64 95.61 1560 95.62 95.64 95.60 1550 95.62 95.62 95.57 1540 95.60 95.63 95.57 1530 95.58 95.60 95.56 1520 95.57 95.60 95.55 1510 95.57 95.58 95.52 1500 95.55 95.56 95.51 1490 95.53 95.54 95.50 1480 95.51 95.53 95.49 1470 95.49 95.50 95.47 1460 95.49 95.50 95.44 1450 95.45 95.48 95.43 1440 95.44 95.46 95.41 1430 95.42 95.45 95.41 1420 95.40 95.41 95.37 1410 95.38 95.40 95.36 1400 95.35 95.38 95.32 1390 95.33 95.36 95.32 1380 95.31 95.34 95.29 1370 95.29 95.31 95.27 1360 95.26 95.29 95.24 1350 95.25 95.26 95.21 1340 95.22 95.23 95.18 1330 95.18 95.20 95.16 1320 95.15 95.17 95.13 1310 95.13 95.15 95.11 1300 95.10 95.11 95.07 1290 95.06 95.07 95.03 1280 95.03 95.04 95.01 1270 94.99 95.01 94.98 1260 94.96 94.97 94.94 1250 94.93 94.94 94.89 1240 94.86 94.89 94.86 1230 94.83 94.84 94.81 1220 94.78 94.79 94.76 1210 94.72 94.75 94.72 1200 94.67 94.69 94.67 1190 94.62 94.63 94.61 1180 94.56 94.57 94.53 1170 94.49 94.52 94.49 1160 94.44 94.44 94.42 1150 94.37 94.38 94.35 1140 94.28 94.30 94.27 1130 94.20 94.21 94.19 1120 94.11 94.12 94.10 1110 94.02 94.03 94.01 1100 93.92 93.93 93.91 1090 93.81 93.83 93.80 1080 93.68 93.68 93.69 1070 93.57 93.57 93.54 1060 93.42 93.43 93.41 1050 93.26 93.27 93.25 1040 93.09 93.09 93.09 1030 92.91 92.91 92.90 1020 92.69 92.71 92.69 1010 92.46 92.48 92.46 1000 92.21 92.22 92.22 990 91.95 91.95 91.96 980 91.63 91.64 91.62 970 91.28 91.31 91.30 960 90.89 90.93 90.91 950 90.47 90.48 90.52