# 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 2023-01-11 (160 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 92.64 91.89 91.78 998 93.80 93.27 92.34 996 92.76 92.64 93.27 994 92.73 92.80 93.35 992 93.71 92.68 92.26 990 92.59 92.96 92.83 988 92.92 92.49 93.06 986 93.03 92.76 93.58 984 92.08 92.99 92.66 982 92.38 91.71 92.30 980 92.23 92.53 92.76 978 91.99 93.01 91.68 976 91.86 92.96 91.94 974 92.05 92.94 92.01 972 92.12 92.31 92.05 970 92.71 92.27 92.41 968 92.35 91.89 91.86 966 92.00 92.97 92.26 964 91.81 92.14 92.34 962 92.16 92.04 90.98 960 92.06 91.92 91.72 958 91.95 92.40 92.75 956 91.26 91.90 91.56 954 91.20 91.23 91.42 952 92.44 91.60 91.53 950 91.61 91.66 91.35 948 91.01 91.58 91.71 946 91.35 91.73 91.90 944 91.46 91.31 91.26 942 91.50 91.29 90.92 940 91.51 91.06 91.03 938 92.07 91.34 91.01 936 91.42 91.21 90.89 934 90.88 91.48 90.92 932 90.57 90.73 91.24 930 90.74 90.65 90.51 928 90.74 90.85 90.14 926 90.18 90.58 90.35 924 90.68 90.55 90.64 922 90.59 90.51 89.85 920 90.22 90.31 90.14 918 90.31 89.82 90.11 916 89.57 89.64 89.94 914 89.92 89.82 89.61 912 89.67 89.63 89.85 910 89.50 89.84 89.54 908 89.33 89.53 89.10 906 89.34 89.25 89.11 904 89.14 89.15 89.24 902 88.99 89.06 89.47 900 88.99 88.94 88.84 898 88.69 89.14 88.43 896 88.56 88.89 88.35 894 88.23 88.48 88.41 892 88.17 88.36 88.17 890 87.75 88.39 88.01 888 88.23 88.19 87.90 886 87.48 87.68 88.01 884 87.65 87.91 87.09 882 87.78 87.85 87.57 880 87.35 87.09 87.36 878 87.22 87.39 87.19 876 87.09 87.35 87.03 874 87.03 86.96 86.98 872 87.02 86.94 86.84 870 86.82 86.68 86.68 868 86.58 86.57 86.79 866 86.46 86.55 86.49 864 86.22 86.38 86.15 862 86.49 86.12 85.92 860 86.06 85.87 85.71 858 86.17 85.97 85.95 856 85.86 85.68 85.67 854 85.51 85.52 85.47 852 85.59 85.21 85.24 850 85.50 85.37 85.41 848 85.40 85.12 85.24 846 85.51 85.22 85.28 844 85.30 85.14 85.01 842 85.39 85.09 85.36 840 85.43 85.21 85.02 838 84.96 85.30 85.09 836 84.91 84.62 85.03 834 84.37 85.03 84.77 832 85.37 85.05 84.73 830 85.06 85.25 84.75 828 84.93 85.26 84.89 826 84.57 84.88 85.03 824 85.17 84.79 84.34 822 85.28 84.83 84.78 820 85.07 84.95 84.77 818 84.83 84.70 84.59 816 84.72 85.08 84.59 814 84.86 85.50 84.42 812 84.97 85.13 85.08 810 84.89 85.27 84.75 808 85.20 85.24 85.24 806 85.44 85.36 85.13 804 85.27 85.38 85.07 802 85.30 85.60 84.99 800 85.37 85.39 85.32 798 85.31 85.46 85.60 796 85.59 85.69 85.47 794 85.74 85.77 85.57 792 85.67 86.01 85.76 790 85.75 85.76 86.00 788 85.89 85.82 85.82 786 85.71 85.61 85.63 784 85.91 86.14 85.93 782 86.02 85.95 86.28 780 86.33 86.06 86.41 778 86.08 86.15 86.23 776 86.06 86.38 86.48 774 86.31 86.45 86.26 772 86.20 86.38 86.26 770 86.39 86.87 86.40 768 86.82 86.87 86.72 766 86.94 86.89 86.53 764 86.60 86.94 86.50 762 86.76 87.07 86.70 760 86.78 87.01 86.84 758 87.01 87.17 86.94 756 87.27 87.32 86.75 754 86.97 87.18 86.91 752 87.14 87.20 87.22 750 87.25 87.15 86.98 748 87.40 87.56 86.97 746 87.47 87.56 87.60 744 87.20 87.36 87.32 742 87.41 87.65 87.54 740 87.54 87.69 87.34 738 87.68 87.72 87.30 736 87.68 87.87 87.41 734 87.89 87.51 87.78 732 87.63 87.74 87.66 730 87.82 87.96 87.72 728 88.08 87.97 87.65 726 87.96 88.36 87.92 724 87.86 88.02 87.83 722 88.25 88.21 87.98 720 88.22 88.15 87.68 718 88.03 88.39 87.88 716 88.10 88.55 88.23 714 88.20 88.29 88.11 712 88.55 88.48 88.21 710 88.26 88.57 88.19 708 88.44 88.44 88.26 706 88.50 88.52 88.25 704 88.33 88.45 88.37 702 88.42 88.52 88.54 700 88.35 88.63 88.46 698 88.68 88.82 88.73 696 88.71 88.78 88.40 694 88.81 88.85 88.44 692 88.70 88.96 88.45 690 88.74 88.78 88.77 688 88.94 88.91 88.41 686 88.86 88.82 88.85 684 88.87 88.94 88.58 682 88.95 89.23 88.77 680 88.79 89.02 88.73 678 88.86 89.17 88.75 676 88.97 88.99 88.90 674 89.22 89.07 89.06 672 89.28 89.50 88.96 670 89.13 89.26 89.04 668 89.15 89.36 89.02 666 89.21 89.24 88.98 664 89.30 89.28 89.13 662 89.11 89.40 89.18 660 89.05 89.40 89.05 658 89.37 89.46 89.22 656 89.37 89.47 89.27 654 89.34 89.54 89.14 652 89.38 89.50 89.41 650 89.55 89.46 89.44 648 89.67 89.71 89.26 646 89.76 89.71 89.41 644 89.75 89.82 89.42 642 89.52 89.78 89.57 640 89.80 89.63 89.50 638 89.60 89.77 89.51 636 89.78 89.85 89.64 634 89.61 89.71 89.66 632 89.73 89.74 89.78 630 89.79 89.77 89.62 628 89.74 89.90 89.81 626 89.91 89.95 89.72 624 89.92 89.91 89.60 622 89.76 89.92 89.76 620 89.94 89.90 89.76 618 89.87 90.11 89.95 616 89.96 90.17 89.77 614 89.91 90.08 89.73 612 90.18 90.15 89.93 610 89.86 90.18 89.75 608 90.10 90.10 89.91 606 90.03 90.24 89.79 604 90.09 90.27 89.92 602 90.30 90.23 89.92 600 90.01 90.09 90.21 598 90.14 90.23 89.91 596 90.20 90.11 90.10 594 90.14 90.17 89.94 592 90.39 90.10 90.04 590 90.19 90.22 90.10 588 90.17 90.18 89.95 586 90.09 90.36 90.13 584 90.43 90.38 90.25 582 90.27 90.41 90.12 580 90.39 90.47 90.21 578 90.40 90.30 90.14 576 90.36 90.32 90.12 574 90.40 90.53 90.26 572 90.58 90.31 90.26 570 90.52 90.52 90.29 568 90.44 90.66 90.32 566 90.42 90.59 90.26 564 90.51 90.50 90.17 562 90.49 90.40 90.26 560 90.53 90.25 90.42 558 90.58 90.46 90.22 556 90.34 90.62 90.49 554 90.40 90.57 90.29 552 90.57 90.63 90.36 550 90.66 90.60 90.35 548 90.45 90.75 90.54 546 90.58 90.59 90.60 544 90.69 90.62 90.30 542 90.62 90.90 90.44 540 90.52 90.77 90.44 538 90.76 90.89 90.62 536 90.88 90.78 90.50 534 90.80 90.71 90.43 532 90.64 90.77 90.32 530 90.52 90.83 90.66 528 91.00 90.64 90.43 526 90.66 90.88 90.46 524 90.62 90.74 90.36 522 90.66 91.01 90.53 520 91.04 90.73 90.73 518 91.00 91.14 90.50 516 90.65 90.92 90.62 514 90.76 90.81 90.54 512 90.86 91.12 90.44 510 90.78 91.02 90.61 508 90.95 91.28 90.40 506 90.85 90.93 90.74 504 90.91 90.97 90.51 502 91.03 91.21 90.65 500 90.78 91.03 90.56 498 90.72 91.05 90.71 496 90.82 90.87 90.70 494 91.07 91.03 90.58 492 90.95 90.94 90.67 490 90.95 91.00 90.63 488 90.84 91.30 90.64 486 91.18 91.04 90.58 484 90.86 90.99 90.82 482 90.92 91.17 90.69 480 90.91 91.13 90.67 478 90.99 91.12 90.79 476 91.16 91.17 91.07 474 90.78 90.94 90.81 472 91.18 91.15 90.57 470 91.20 91.14 90.67 468 91.02 91.14 91.08 466 91.36 91.26 90.86 464 91.19 91.03 90.98 462 91.11 91.14 90.93 460 91.14 91.28 90.75 458 91.05 91.34 90.85 456 91.23 90.93 90.70 454 91.28 91.38 90.92 452 91.15 91.21 90.89 450 91.18 90.95 90.90 448 91.13 91.20 90.89 446 91.63 91.07 91.13 444 91.50 91.39 90.66 442 91.35 91.01 90.59 440 90.98 91.06 90.83 438 91.07 90.76 90.73 436 91.21 91.43 90.82 434 91.09 91.42 91.23 432 91.33 90.89 91.12 430 91.15 91.52 90.66 428 91.10 91.38 90.56 426 90.70 91.56 90.75 424 91.32 91.08 91.39 422 91.02 91.27 91.10 420 90.77 91.35 90.93 418 91.02 91.17 91.56 416 91.34 91.29 91.50 414 90.51 91.27 90.91 412 91.08 91.21 90.95 410 90.66 91.38 90.05 408 91.39 91.28 90.35 406 90.82 91.73 91.23 404 90.94 91.00 91.06 402 90.96 91.10 90.80 400 91.20 91.38 90.48 398 91.42 91.68 90.76 396 92.26 91.08 91.10 394 90.99 90.91 90.96 392 91.92 91.05 90.79 390 90.99 91.68 91.15 388 91.39 91.44 91.11 386 90.59 91.28 90.53 384 91.74 91.21 90.80 382 91.93 91.00 90.86 380 92.38 92.25 90.86 1650 96.77 96.82 96.70 1640 96.80 96.84 96.71 1630 96.79 96.85 96.72 1620 96.80 96.86 96.73 1610 96.81 96.85 96.74 1600 96.81 96.87 96.74 1590 96.81 96.86 96.72 1580 96.82 96.85 96.73 1570 96.80 96.85 96.73 1560 96.79 96.85 96.72 1550 96.78 96.85 96.71 1540 96.77 96.83 96.70 1530 96.76 96.82 96.68 1520 96.76 96.81 96.67 1510 96.75 96.80 96.67 1500 96.73 96.80 96.64 1490 96.71 96.78 96.63 1480 96.71 96.76 96.62 1470 96.70 96.75 96.61 1460 96.68 96.73 96.59 1450 96.67 96.73 96.57 1440 96.64 96.70 96.55 1430 96.63 96.69 96.55 1420 96.61 96.67 96.52 1410 96.60 96.66 96.51 1400 96.57 96.64 96.49 1390 96.55 96.62 96.46 1380 96.53 96.60 96.45 1370 96.51 96.58 96.43 1360 96.50 96.56 96.40 1350 96.47 96.53 96.37 1340 96.45 96.51 96.36 1330 96.43 96.49 96.33 1320 96.39 96.46 96.30 1310 96.38 96.43 96.28 1300 96.34 96.40 96.25 1290 96.31 96.36 96.22 1280 96.28 96.35 96.18 1270 96.24 96.31 96.16 1260 96.21 96.27 96.12 1250 96.18 96.25 96.09 1240 96.13 96.21 96.05 1230 96.08 96.16 96.00 1220 96.05 96.11 95.96 1210 96.01 96.07 95.91 1200 95.95 96.02 95.87 1190 95.90 95.97 95.81 1180 95.85 95.91 95.76 1170 95.78 95.85 95.70 1160 95.72 95.79 95.64 1150 95.66 95.73 95.57 1140 95.58 95.66 95.49 1130 95.51 95.58 95.44 1120 95.42 95.50 95.35 1110 95.34 95.42 95.25 1100 95.24 95.33 95.15 1090 95.14 95.22 95.05 1080 95.03 95.09 94.93 1070 94.90 94.99 94.82 1060 94.77 94.84 94.68 1050 94.63 94.71 94.53 1040 94.46 94.54 94.37 1030 94.29 94.37 94.20 1020 94.08 94.16 93.99 1010 93.88 93.96 93.79 1000 93.63 93.73 93.55 990 93.37 93.45 93.29 980 93.09 93.17 92.99 970 92.75 92.83 92.67 960 92.39 92.46 92.29 950 91.96 92.05 91.89