Date: 2020 Sep 13 UTC Observers: P Garnavich (ND, lead), C Wood (ND), R Pogge (OSU), O Kuhn (LBTO) Remote Participants: L Laufman (UM), J Sullivan (ND), Ananya (ND) Special Assistants: Trim, Bentley, & Hubble TO: D. Gonzalez SA: O. Kuhn David Gonzalez on-site at LBT, all others remote from home. Moon phase: Waning Cresent Summary: Started in haze again, afternoon clouds dissipated by sunset. ALTA predicted worse seeing tonight, Mt. G did not disappoint, started out ~1 arcsec, worse towards midnight, then better towards dawn. Started with MODS long-slit and MOS, switched to LBC at midnight until dawn. 3 MODS targets in 1-2" seeing, 4 LBC targets, lost N925 to poor seeing then an AZ drive fault. Calibrations: MODS flux star BD+28 4211 (dual grating) at start LBC sky flats at dawn Completed Observations: MODS OSU_ASASSN SN2019pjs (good detection) OSU_CHAOS N6946F2 MOS (started 1.2", degraded through visit) ND_carbon HE0014+0048 (1.6-2") LBC OSU_monitor: N925 (aborted), N628, N672 OSU_dwarfs: AGC112521 Details (All times UT): ---------------------- 02:40 David is opening the enclosure. 02:57 Pointing and collimation check. The FWHM on the guiders is about 1.3-1.4" now. 02:59 Slewing to BD+28 4211 (dual grating) acqBinoMODS bd284211.acq mods1r 03 offsetxy -0.378 11.278 rel 4, needed a tweak to the left: offsetxy -0.372 0.225 rel 5, looks good mods2r 03 offsetxy 4.126 7.388 rel 4, needed a tweak to the left: offsetxy -0.708 -0.022 rel 5, looks good 03:11 execBinoMODS bd284211.obs FWHM 1.1" on both guiders at the start, but already about 2-3 min in the FWHM is down to ~0.97"/0.93" on SX/DX and the Shack spots have average FWHM ~0.8" 03:20 Slewing to SN2019pjs (1", dual grating) acqBinoMODS SN2019pjs.acq mods1r: 9 and 10 offsetxy -0.552 11.283 rel 11, looked a tad to the right, we adjusted it by dX = -0.2" mods2r: 9 and 10 offsetxy 3.596 7.882 rel 11, looked well-centered execBinoMODS SN2019pjs FWHM on SX,DX guiders is 0.97", 0.92" at the start of the first exposure but it has been increasing, up to ~1.1" at the end of the first exposure. 04:34 Seeing has been getting worse and we are seeing some blowups to ~2". mods1r 12-14 mods1b 06-08 mods2r 12-14 mods2b 06-08 04:46 Slewing to N6946F2 (MOS, dual grating) acqBinoMODS N6946F2.acq mods1r: 15 and 16 offsetpointing -0.2612 -1.102 1.291 detxy rel 17 mods2r: 15 and 16 offsetpointing -0.1421 3.766 -0.509 detxy rel 05:00 execBinoMODS N6946F2.obs (6 x 1200-sec) avg FWHM at the start ~1.1"/1.2" on SX/DX 06:00 seeing is blowing up to 1.5-2 for one or a few guide images; looked like it was mostly affecting DX, not SX. 06:50 Starting last exposure. FWHM has been variable but has been >~1.5" during this exposure, up to ~2" at the end. mods1r: 18-23 mods1b: 09-14 mods2r: 18-23 mods2b: 09-14 07:14 Slewing to he0015+0048 (0.6" slit, dual grating) acqBinoMODS he0015+0048_pa0.acq avg FWHM on guiders is ~1.6" mods1r: 24 and 25 offsetxy -0.559 11.586 rel 26, looks well-centered mods2r: 24 and 25 offsetxy 4.188 8.133 rel 26, looks well-centered 07:24 execBinoMODS he0015+0048.obs 07:28 average FWHM ~ 1.7"/1.8" but there are blowups to ~2" mods1r: 27-29 mods1b: 15-17 mods2r: 27-29 mods2b: 15-17 --- Switch to LBCs --- 07:47 David is reconfiguring to the LBCs now. The mirror temps are : SX: ambient = 8.605, glass=8.055, diff_radial=0.077, face-back=-0.135 DX: ambient = 8.281, glass=7.919, diff_radial=0.058, face-back=-0.333 08:02 Slewing to N925 focus field (there was an alarm and I allowed the images to be taken before focus/collim). Running dohybrid. WRS is sending only coma, but LBCB appears to have some astigmatism, from the looks of the first FPIA pupils. Waiting... Converged after 3 FPIA iterations. Pupils look blurry. Copointing: b081447 and r 081442 Starting the OB: N925 b starts with 082058, ~10 pix, 2.25" FWHM r starts with 082052, ~9.5 pix, 2.14" FWHM On the guide stars, the FWHM is ~2.4", 2.3" Going to repeat N925: refocusing on N925focus with dofpia 08:52 Starting the N925 science, but at this moment the AZ drive power turned off and the preset was canceled. 08:52 - 09:11 downtime due to problem with AZ drive power. 09:11 Slewing to OSU_monitor N628 Slewing to N628focus. dofpia I started to run the N628 and then went back to copoint - but the copointing images show the galaxy. I think this was my mistake but as the FPIA pupil images did not suggest that the copointing was too far off, we decided just to skipped the copointing. 09:22 observing N628 b starts with 092303 and r with 092257 0.9"/0.8" on the blue/red guider images 09:44 1.4" on blue guider there is a PSF gradient on the LBCR images 09:59 Slewing to OSU_dwarfs AGC112521 AGC112521focus, dofpia copointing: b 100908 and r 100904 Starting the OB: AGC112521 b starts with 101225 and r starts with 101219 FWHM on guide images is 1.2"/1.0" on blue/red blue images appear slightly elongated 11:10 Slewing to OSU_monitor N672 dofpia on N672focus copointing: b 111621 r 111615 Starting the OB: OSUmonitorN672 b starts with 112015 and r with 112009, images have FWHM <~1.2" (blue) and ~1" (red) 11:40 - 18-deg twilight, The seeing (according to the guide star images) is starting to blow up - 1.5" on the blue (Uspec) and 1.3" on the red. 12:00 Slewed to Blank field 03+31 for twilight sky flats (VBUs + R) V & R starting at 12:20 with 12-sec repeating the V & R flats overall, there are ~6 V flats with 10-35k, R flats are a bit low. B & R starting at 12:32 PA=0 2-sec PA=180 1-sec Us & R: We got a set of 8 Us flats with 15-33k counts. See https://wiki.lbto.org/Instrumentation/LogOfLBCTwilightSkyFlats for the filenames and counts. The table at this link should be automatically updated daily. 12:55 David is closing the enclosure.