Zero points in 1-minute exposure (1 ADU/minute) without extinction correction Civil date ZP (B) err ZP(V) err ZP(R) err airmass stds SARA-KP 22 Jan 2015 26.781 0.009 26.853 0.009 26.758 0.016 1.12 PG0231 17 Feb 2015 26.753 0.007 26.820 0.010 26.718 0.017 1.26 PG0231 26 March 2015 26.665 0.049 26.786 0.009 26.698 0.006 1.12 GD 71 15 April 2015 26.647 0.022 26.782 0.009 26.704 0.012 1.30 Rubin 152 08 July 2015 26.636 0.030 26.720 0.019 26.634 0.009 1.16 PG 1633 15 Oct 2015 26.442 0.004 26.594 0.003 26.545 0.011 1.35 PG 2213 01 Nov 20165 26.691 0.009 26.813 0.004 26.733 0.011 1.25 PG 2213 (mirror just cleaned) 11 Nov 2015 26.730 0.006 26.823 0.011 26.750 0.013 1.23 PG 2213 24 Nov 2015 26.710 0.020 26.801 0.003 26.735 0.015 1.18 PG 2213 28 Dec 2015 26.701 0.032 26.772 0.009 26.663 0.018 1.28 PG 0231 10 Feb 2016 26.732 0.022 26.792 0.006 26.680 0.013 1.04 GD 71 16 Feb 2016 26.624 0.020 26.748 0.006 26.657 0.007 1.34 Rubin 152 26 Feb 2016 26.718 0.021 26.767 0.015 26.672 0.010 1.05 GD 71 09 Mar 2016 26.743 0.022 26.779 0.007 26.697 0.009 1.05 GD 71 shutter replaced 31 Mar 2016 26.631 0.024 26.721 0.008 26.618 0.012 1.18 GD 71 25 Apr 2016 26.609 0.015 26.735 0.004 26.620 0.014 1.22 PG 0942 29 Apr 2016 26.544 0.016 26.656 0.013 26.580 0.021 1.23 PG 0942 02 May 2016 26.538 0.013 26.666 0.026 26.611 0.019 1.23 PG 0942 04 May 2016 26.557 0.038 26.726 0.022 26.610 0.022 1.25 PG 0942 16 Jun 2016 26.548 0.035 26.721 0.008 26.642 0.012 1.34 PG 1323 01 Jul 2016 26.364 0.017 26.581 0.023 26.515 0.027 1.60 PG 1323 01 Jul 2016 26.511 0.009 26.633 0.006 26.577 0.014 1.18 PG 2213 ext=0.35,0.29,0.15 04 Sep 2016 26.674 0.014 26.747 0.004 26.647 0.006 1.17 PG 1633 08 Oct 2016 26.630 0.010 26.727 0.004 26.660 0.014 1.19 PG 2213 11 Oct 2016 26.622 0.020 26.746 0.015 26.676 0.017 1.50 PG 2213 24 Nov 2016 26.631 0.016 26.767 0.012 26.683 0.024 1.19 PG 2213 01 Mar 2017 26.669 0.020 26.747 0.009 26.650 0.014 1.04 GD 71 29 Mar 2017 26.445 0.028 26.689 0.008 26.564 0.009 1.19 Rubin 149 04 Apr 2017 26.463 0.022 26.691 0.006 26.601 0.007 1.23 Rubin 149 05 Apr 2017 26.556 0.028 26.704 0.014 26.609 0.026 1.21 Rubin 149 19 Apr 2017 26.431 0.041 26.662 0.013 26.582 0.010 1.33 Rubin 149 26 May 2017 26.540 0.012 26.684 0.021 26.595 0.022 1.39 PG 1323 28 May 2017 26.503 0.010 26.631 0.014 26.541 0.002 1.37 PG 1323 18 Sep 2017 26.615 0.013 26.669 0.020 26.616 0.013 1.23 PG 1633 09 Nov 2017 26.526 0.018 26.501 0.025 26.257 0.013 1.24 PG 2213 R suspect 20 Dec 2017 26.547 0.010 26.702 0.009 26.641 0.014 1.29 PG 2213 17 Jan 2018 26.623 0.024 26.684 0.008 26.586 0.017 1.12 PG 0231 15 Mar 2018 26.610 0.023 26.692 0.006 26.595 0.013 1.36 GD 71 14 Jun 2018 26.316 0.026 26.490 0.038 26.382 0.017 1.32 PG 1323 20 Jun 2018 26.487 0.043 26.597 0.020 26.483 0.010 1.33 PG 1323 03 Oct 2018 26.779 0.009 26.945 0.012 26.782 0.013 1.19 PG 2213 mirror recoated 27 Nov 2018 26.727 0.005 26.759 0.011 26.500 0.015 1.21 PG 2213 R suspect 13 Dec 2018 26.776 0.008 26.924 0.010 26.709 0.017 1.23 PG 2213 13 Dec 2018 26.819 0.023 26.912 0.006 26.739 0.013 1.17 GD 71 20 Dec 2018 26.775 0.008 26.915 0.013 26.776 0.014 1.31 PG 2213 14 Jan 2019 26.847 0.029 26.916 0.016 26.757 0.022 1.14 PG 0231 24 Apr 2019 26.692 0.013 26.851 0.014 26.676 0.013 1.34 PG 1323 04 May 2019 26.670 0.011 26.822 0.012 26.664 0.012 1.28 PG 0942 U 22.37(12) I 26.784(45) 19 Jun 2019 26.680 0.018 26.784 0.006 26.626 0.006 1.30 PG 1633 03 Jul 2019 ——— —— 26.817 0.006 26.672 0.010 1.18 PG 1633 30 Sep 2019 26.660 0.042 26.828 0.026 26.643 0.015 1.32 PG 1657 27 Oct 2019 26.672 0.047 26.766 0.015 26.645 0.055 1.30 SA 110 13 Nov 2019 26.628 0.025 26.794 0.014 26.661 0.010 1.22 PG 2213 13 Nov 2019 26.716 0.021 26.811 0.007 26.660 0.011 1.08 GD 71 06 Jan 2020 26.545 0.021 26.727 0.019 26.617 0.012 1.70 PG 2213 12 Feb 2020 26.675 0.026 26.604 0.006 26.304 0.009 1.12 GD 71 R is weird 20 Feb 2020 26.674 0.027 26.776 0.007 26.625 0.012 1.07 GD 71 03 Nov 2020 26.578 0.022 26.720 0.009 26.529 0.030 1.15 PG 0231 reopening 16 Nov 2020 26.593 0.009 26.754 0.014 26.606 0.012 1.19 PG 2213 30 Nov 2020 26.616 0.017 26.761 0.011 26.633 0.011 1.19 PG 2213 18 Jan 2021 26.624 0.020 26.735 0.007 26.548 0.024 1.12 PG 0231 18 Jan 2021 26.646 0.024 26.746 0.006 26.543 0.010 1.08 GD 71 10 Feb 2021 26.630 0.018 26.733 0.010 26.575 0.012 1.21 PG 0231 21 Feb 2021 27.600 0.022 26.727 0.010 26.233 0.028 1.39 PG 0231 what’s with R? 10 Mar 2021 26.621 0.022 26.743 0.007 26.574 0.014 1.04 GD 71 07 May 2021 26.448 0.034 26.668 0.019 26.512 0.024 1.25 PG 0942 06 Oct 2021 26.594 0.040 26.689 0.020 26.486 0.014 1.37 PG 1657 cirrus? 14 Oct 2021 26.385 0.006 26.521 0.010 26.463 0.020 1.48 PG 2213 21 Oct 2021 26.476 0.019 26.633 0.023 26.503 0.023 1.41 PG 2213 focus 08 Dec 2021 26.489 0.017 26.635 0.005 26.403 0.010 1.20 PG 2213 focus repaired 10 Jan 2022 - - - - - - 26.562 0.006 26.391 0.014 1.07 GD 71 no B data 20 Jan 2022 26.392 0.027 26.527 0.015 26.339 0.024 1.12 PG 0231 31 Jan 2022 26.457 0.026 26.606 0.005 26.447 0.008 1.43 GD 71 03 Feb 2022 26.509 0.028 26.639 0.005 26.484 0.023 1.14 PG 0231 28 Feb 2022 26.508 0.023 26.678 0.009 26.451 0.016 1.04 GD 71 27 Mar 2022 26.479 0.033 26.588 0.009 26.430 0.010 1.10 GD 71 SARA-CT: 01 May 2014 25.795 0.010 25.834 0.010 25.844 0.015 1.37 PG 2213 10 Dec 2014 25.827 0.023 25.806 0.007 25.817 0.011 1.05 T Phe 20 Jan 2015 25.724 0.020 25.664 0.016 25.688 0.016 1.36 PG0231 17 Feb 2015 25.516 0.030 25.553 0.009 25.541 0.030 1.66 PG0231 21 April 2015 25.692 0.023 25.742 0.007 25.741 0.012 1.15 Rubin 152 12 May 2015 25.661 0.027 25.710 0.024 25.752 0.008 1.27 Rubin 152 08 June 2015 25.668 0.025 25.715 0.011 25.735 0.007 1.26 PG1323 ARC camera 09 Dec 2015 24.758 0.026 24.870 0.016 25.076 0.013 1.49 PG 2213 FLI camera 28 Dec 2015 24.866 0.019 24.917 0.014 25.119 0.020 1.24 PG 0231 FLI camera 7 Jan 2016 24.915 0.009 25.008 0.033 25.163 0.015 1.24 PG 0231 FLI camera 12 Jan 2016 25.102 0.045 24.961 0.011 25.120 0.016 1.25 PG 0231 FLI camera 25 Jan 2016 24.805 0.006 24.892 0.010 25.111 0.009 1.44 GD 71 FLI camera cirrus? 5 Feb 2016 24.818 0.009 24.883 0.008 25.099 0.010 1.49 GD 71 FLI camera 7 Apr 2016 24.714 0.018 24.810 0.005 25.058 0.011 1.67 GD 71 FLI 7 Apr 2016 24.869 0.038 24.942 0.026 25.150 0.029 1.09 PG 1323 FLI ext=0.27,0.23,0.16 25 Apr 2016 24.946 0.017 24.971 0.019 25.204 0.016 1.13 PG 1323 FLI 04 Aug 2016 24.606 0.026 24.761 0.013 25.037 0.014 1.2 PG 1323 FLI 30 Oct 2016 24.709 0.024 24.787 0.028 25.067 0.017 1.17 PG 2213 FLI 08 Nov 2016 24.768 0.023 24.869 0.027 25.086 0.019 1.15 PG 2213 FLI 10 Nov 2016 24.780 0.027 24.784 0.039 25.082 0.018 1.16 PG 2213 FLI 29 Nov 2016 24.363 0.037 24.558 0.024 24.854 0.018 1.36 PG 2213 FLI 27 Jan 2017 24.274 0.023 24.476 0.012 24.780 0.013 1.56 GD 71 FLI 30 Jan 2017 24.667 0.022 24.704 0.065 24.987 0.014 1.59 GD 71 FLI 08 Feb 2017 24.682 0.018 24.788 0.021 25.043 0.020 1.08 PG 1323 FLI 29 Mar 2017 24.646 0.025 24.774 0.024 25.052 0.016 1.15 Rubin 149 FLI 19 Apr 2017 24.643 0.016 24.779 0.035 25.048 0.018 1.17 Rubin 149 FLI 21 Jul 2017 24.777 0.090 24.781 0.034 25.020 0.015 1.14 PG 1407 FLI 20 Sep 2017 24.566 0.025 24.634 0.014 24.907 0.017 1.53 PG 1633 FLI 31 Oct 2017 24.654 0.030 24.718 0.028 24.890 0.030 1.17 PG 2213 FLI 31 Oct 2017 24.516 0.018 24.678 0.010 24.928 0.006 1.46 GD 71 FLI ext 0.47,0.14,0.07 14 Nov 2017 24.600 0.049 24.659 0.035 24.784 0.026 1.17 PG 2213 FLI 16 Nov 2017 24.644 0.022 24.642 0.012 24.881 0.016 1.18 PG 2213 FLI 20 Nov 2017 24.693 0.065 24.728 0.029 24.992 0.026 1.19 PG 2213 FLI 20 Dec 2017 24.523 0.024 24.648 0.017 24.948 0.030 1.08 T Phe FLI 17 Jan 2018 24.508 0.032 24.639 0.014 24.855 0.024 1.32 T Phe FLI 30 Jan 2018 24.556 0.059 24.610 0.016 24.894 0.032 1.47 T Phe FLI 02 Mar 2018 24.427 0.003 24.562 0.010 24.814 0.005 1.44 GD 71 FLI 16 Apr 2018 24.460 0.029 24.586 0.019 24.919 0.017 1.16 Ru 149 FLI 11 Jul 2018 25.806 0.036 26.037 0.012 26.131 0.019 1.32 PG 1633 Andor 01 Oct 2018 24.335 0.058 24.630 0.037 24.868 0.027 1.60 PG 2213 FLI 02 Oct 2018 24.544 0.064 24.428 0.034 24.740 0.027 1.54 PG 2213 FLI 08 Nov 2018 24.564 0.068 24.578 0.027 24.870 0.011 1.15 PG 2213 FLI 30 Jan 2019 24.373 0.089 24.411 0.050 24.726 0.014 1.39 PG 0231 FLI 27 Feb 2019 24.299 0.012 24.454 0.010 24.731 0.009 1.44 GD 71 FLI 01 Apr 2019 24.255 0.025 24.407 0.013 24.710 0.011 1.65 GD 71 FLI 22 Jul 2019 26.067 0.025 26.071 0.013 26.112 0.005 1.35 PG 1633 Andor (clouds?) 07 Aug 2019 26.072 0.029 26.076 0.008 26.160 0.009 1.36 PG 1633 Andor 08 Aug 2019 26.087 0.030 26.049 0.015 26.084 0.010 1.39 PG 1633 Andor 18 Sep 2019 24.426 0.074 24.240 0.052 24.615 0.039 1.42 PG 1657 FLI 05 Nov 2019 24.361 0.030 24.512 0.030 24.770 0.026 1.16 PG 2213 FLI 07 Nov 2019 24.361 0.036 24.460 0.027 24.779 0.019 1.15 PG 2213 FLI 19 Dec 2019 24.219 0.007 24.404 0.007 24.660 0.003 1.46 GD 71 FLI 03 Jan 2020 24.524 0.063 24.557 0.037 24.740 0.028 1.16 T Phe FLI poor sigma 05 Jan 2020 24.187 0.049 24.271 0.048 24.643 0.017 1.20 T Phe FLI BV poor? 29 Jan 2020 24.095 0.011 24.168 0.023 24.490 0.021 1.50 T Phe FLI 24 Feb 2020 24.319 0.050 24.386 0.027 24.619 0.016 1.12 PG 0942 FLI 16 Mar 2020 24.353 0.043 24.485 0.014 24.733 0.018 1.47 GD 71 FLI 07 Jan 2021 24.326 0.060 24.469 0.013 24.719 0.029 1.19 T Phe FLI reopen 31 Jan 2021 24.324 0.032 24.417 0.031 24.720 0.050 1.54 T Phe FLI 31 Jan 2021 24.233 0.041 24.429 0.019 24.662 0.018 1.18 Ru 149 FLI 04 Feb 2021 24.309 0.026 24.408 0.018 24.708 0.019 1.17 Ru 149 FLI 05 Apr 2021 25.978 0.015 26.064 0.015 26.070 0.009 1.15 Ru 149 Andor 23 Apr 2021 26.096 0.014 26.193 0.011 26.232 0.008 1.24 Ru 149 Andor cirrus? 09 Jun 2021 25.943 0.023 26.024 0.012 26.022 0.017 1.19 PG 0942 Andor 07 Jul 2021 26.028 0.012 26.042 0.006 26.085 0.004 1.07 PG 1323 Andor 12 Oct 2021 26.022 0.018 26.248 0.011 26.200 0.009 1.44 GD 71 Andor #2 cirrus? 14 Oct 2021 26.151 0.025 26.232 0.012 26.252 0.012 1.27 PG 2213 Andor #2 02 Dec 2021 26.258 0.029 26.297 0.019 26.284 0.022 1.04 T Phe Andor #2 10 Dec 2021 26.218 0.022 26.255 0.032 26.285 0.015 1.04 T Phe Andor #2 27 Dec 2021 26.210 0.032 26.228 0.034 26.250 0.015 1.10 T Phe Andor #2 28 Dec 2021 26.179 0.029 26.157 0.025 26.263 0.016 1.11 T Phe Andor #2 03 Jan 2022 26.181 0.049 26.203 0.025 26.213 0.020 1.15 T Phe Andor #2 17 Jan 2022 25.924 0.050 26.004 0.042 25.962 0.028 1.27 PG 0942 Andor #2 21 Feb 2022 26.184 0.039 26.124 0.014 26.194 0.015 1.44 GD 71 Andor #2 25 Feb 2022 25.983 0.027 25.948 0.022 26.050 0.012 1.44 GD 71 Andor #2 JKT 28 Apr 2016 27.633 0.013 27.886 0.014 27.909 0.011 1.24 PG 0942 01 May 2016 27.638 0.012 27.837 0.005 27.901 0.012 1.18 PG 0942 01 May 2016 27.629 0.010 27.789 0.004 27.875 0.002 1.26 PG 1633 05 May 2016 27.612 0.042 27.836 0.011 27.895 0.010 1.19 PG 0942 05 May 2016 27.641 0.007 27.813 0.004 27.885 0.003 1.28 PG 1633 03 Jun 2016 27.644 0.018 27.831 0.026 27.888 0.028 1.26 PG 1323 31 Aug 2016 27.538 0.008 27.670 0.004 28.057 0.004 1.10 PG 16334 27 Sep 2016 27.493 0.013 27.670 0.008 28.053 0.011 1.17 PG 2213 28 Oct 2016 27.501 0.010 27.665 0.004 27.736 0.009 1.19 PG 2213 17 Jan 2017 27.451 0.003 27.598 0.011 27.656 0.005 1.09 PG 0231 17 Jan 2017 27.388 0.007 27.557 0.010 27.646 0.008 1.48 PG 1633 18 Jan 2017 27.438 0.003 27.599 0.002 27.669 0.003 1.09 PG 0231 18 Jan 2017 27.257 0.007 27.530 0.010 27.654 0.009 1.43 PG 1633 03 Feb 2017 27.404 0.006 27.572 0.006 27.636 0.007 1.11 PG 0231 10 Apr 2017 27.269 0.008 27.470 0.020 27.538 0.012 1.19 Rubin 149 23 Apr 2017 27.273 0.008 27.481 0.004 27.546 0.015 1.32 Rubin 149 17 Aug 2017 27.053 0.007 27.228 0.008 27.299 0.011 1.06 PG 1633 12 Sep 2017 27.183 0.014 27.332 0.010 27.401 0.010 1.16 PG 1633 20 Sep 2017 27.108 0.007 27.282 0.008 27.344 0.007 1.21 PG 1633 28 Sep 2017 27.062 0.015 27.212 0.009 27.289 0.004 1.29 PG 1633 28 Sep 2017 27.117 0.004 27.276 0.004 27.345 0.003 1.03 GD 71 ext ~constant in BVR: 0.23 07 Dec 2017 27.051 0.014 27.195 0.013 27.317 0.013 1.16 PG 2213 28 Dec 2017 26.978 0.015 27.215 0.012 27.289 0.016 1.39 PG 2213 U 24.231 0.012 I 26.308 0.006 28 Dec 2017 27.010 0.009 27.185 0.015 27.276 0.010 1.21 Ru 149 13 Mar 2018 26.951 0.005 27.146 0.003 27.227 0.005 1.02 GD 71 09 May 2018 26.905 0.017 27.108 0.019 27.176 0.013 1.20 PG 0942 05 Jul 2018 26.572 0.016 26.744 0.009 26.831 0.009 1.18 PG 1633 (dust) 16 Aug 2018 26.788 0.008 26.972 0.005 27.063 0.005 1.06 PG 1633 I: 26.112 (6) 19 Aug 2018 26.681 0.020 26.922 0.018 26.517 0.011 1.37 PG 1525 I: 26.051 0.038 17 Sep 2018 26.788 0.021 26.972 0.014 27.026 0.009 1.17 PG 1657 I: 26.083 0.006 06 Nov 2018 26.733 0.009 26.942 0.014 27.040 0.016 1.21 PG 2213 15 Nov 2018 26.721 0.005 26.947 0.003 27.028 0.007 1.04 GD 71 27 Nov 2018 27.201 0.005 27.221 0.011 27.417 0.014 1.14 PG 2213 13 Dec 2018 27.092 0.018 27.287 0.011 27.371 0.012 1.18 PG 2213 20 Dec 2018 27.089 0.011 27.286 0.023 27.401 0.015 1.32 PG 2213 27 Dec 2018 27.044 0.016 27.298 0.010 27.395 0.016 1.34 PG 2213 29 Dec 2018 26.977 0.006 27.066 0.010 26.984 0.007 1.37 PG 2213 dome? 04 Feb 2019 27.106 0.002 27.296 0.005 27.371 0.003 1.12 PG 0231 05 Mar 2019 26.793 0.007 26.947 0.003 26.683 0.008 1.02 GD 71 cirrus? 06 Mar 2019 26.738 0.009 26.601 0.008 26.525 0.016 1.02 GD 71 cirrus? 11 Mar 2019 26.880 0.005 27.042 0.007 27.132 0.005 1.02 GD 71 12 Mar 2019 26.918 0.006 27.111 0.005 27.202 0.017 1.02 GD 71 08 Apr 2019 26.715 0.009 26.928 0.005 27.106 0.011 1.20 GD 71 cirrus? 10 Apr 2019 26.868 0.007 27.056 0.004 27.174 0.009 1.23 GD 71 19 Jun 2019 27.030 0.009 27.186 0.007 27.278 0.008 1.05 PG 1633 25 Jun 2019 27.017 0.009 27.182 0.006 27.282 0.008 1.14 PG 1633 08 Oct 2019 27.578 0.008 27.772 0.033 27.796 0.011 1.35 PG 1657 mirror recoated 10 Oct 2019 27.574 0.014 27.778 0.016 27.804 0.014 1.41 PG 1657 25 Nov 2019 27.585 0.006 27.769 0.003 27.837 0.006 1.15 GD 71 26 Nov 2019 27.565 0.013 27.750 0.007 27.851 0.014 1.14 PG 2213 13 Dec 2019 27.516 0.012 27.721 0.012 27.773 0.014 1.18 PG 2213 27 Dec 2019 27.738 0.009 27.813 0.015 1.34 PG 2213 14 Jan 2020 27.528 0.007 27.719 0.004 27.785 0.004 1.24 GD 71 13 May 2020 27.339 0.014 27.508 0.015 27.587 0.005 1.24 PG 0942 15 May 2020 27.376 0.019 27.611 0.016 27.672 0.012 1.31 PG 0942 21 Jul 2020 27.454 0.008 27.613 0.006 27.674 0.006 1.08 PG 1633 23 Jul 2020 27.392 0.007 27.556 0.005 27.597 0.006 1.05 PG 1633 24 Jul 2020 27.461 0.007 27.619 0.007 27.699 0.008 1.05 PG 1633 18 Aug 2020 27.438 0.010 27.602 0.016 27.638 0.007 1.06 PG 1633 30 Aug 2020 27.396 0.003 27.566 0.002 27.619 0.001 1.09 PG 0231 31 Aug 2020 27.405 0.008 27.565 0.005 27.635 0.007 1.11 PG 1633 04 Sep 2020 27.202 0.006 27.379 0.007 27.446 0.009 1.34 PG 1633 20 Oct 2020 27.112 0.009 27.105 0.007 26.846 0.012 1.16 PG 2213 clouds 14 Dec 2020 27.248 0.026 27.500 0.012 27.367 0.012 1.18 PG 2213 17 Mar 2021 27.247 0.007 27.444 0.004 27.493 0.005 1.04 GD 71 14 Jun 2021 27.181 0.029 27.399 0.020 27.451 0.017 1.20 PG 1657 11 Feb 2022 27.038 0.010 27.227 0.003 27.287 0.008 1.12 GD 71 Nominal chip properties: For the Kitt Peak ARC CCD Gain: 2.32 e/ADU Std Dev: 2.58 ADU Read Noise: 5.97 e For CTIO ARC CCD Gain : 2.6 ADU Read Noise: 5.5 e Image scales (arcseconds/pixel) KP U42 0.382 KP ARC 0.439 CT ARC 0.3792 CT QSI 0.137 CT FLI 0.6076 JKT Andor 0.3403