Date: 2020 Sep 13 UTC
Observers: R Pogge (OSU), C Wood (ND), P Garnavich (ND), O Kuhn (LBTO)
Remote Participants: N Rogers (UM), L Laufman (UM), J Sullivan (ND)
Special Assistants: Trim, Hubble, & Bentley
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 that got better as the night went on. MODS long-slit
observing, 4 targets, 2 with long-visits and time-series  Standard at
the start of the night (repeat of BD+284211).  Seeing was very good,
0.6-0.7 most times, as low as 0.5, sub-arcsec all night.


Calibrations: None


Completed Observations: 
  OSU_ASASSN ASASSN20hk
  UVa_FR_AGN J2109-06
  UM_wd  ZTFJ2049...
  ND_lamost lamost


Details (All times UT):
----------------------

00:30 started MODS calibrations
      acqBinoMODS bd284211.acq
      mods1r: 3 
      offsetxy -0.485 11.856 rel
      on 4, needed a tweak: offsetxy -0.504 -0.200 rel
      mods2r: 3 
      offsetxy  3.779  7.589 rel
      on 4, needed a tweak: offsetxy -0.501  0.061 rel
      execBinoMODS bd284211_blueonly.obs.txt 
      mods1b: 4-6
      mods2b: 3-6

03:51 Slewing to OSU_ASASSN 20hk (1" slit, dual grating mode)
      acqBinoMODS ASASSN20hk.acq
      FWHM on guiders is ~0.5"!
      mods1r: 5 and 6
      offsetxy -0.601 11.595 rel
      confirmatory image 7 is a bit to the right, we gave an offset dX = -0.18"
      mods2r: 5 and 6
      offsetxy  3.558  8.225 rel
      confirmatory image 7 looks good

04:04 execBinoMODS ASASSN20hk.obs
      FWHM on guiders is ~0.55" but there is haze - we think there may be about 1
      mag extinction
      mods1r: 8-11
      mods1b: 7-10
      mods2r: 8-11
      mods2b: 6-9

04:54 Slewing to UVa_FR_AGN J2109-06 (2.4" slit, dual grating mode)
      acqBinoMODS J2109-06.acq
      FWHM on the guiders is ~0.6"
      mods1r: 12 and 13
      offsetxy -0.891 11.673 rel
      14, looks pretty well-centered. Not off enough to tweak anything.
      mods2r: 12 and 13    
      Rick did this acquisition via remote x2go session, no noticeable lag,
         did all subsequet MODS2 acquisitions
      14, looks well-centered.
      execBinoMODS J2109-06.obs
      FWHM on the guiders is still ~0.6"
      mods1r: 15-17
      mods1b: 11-13
      mods2r: 15-17
      mods2b: 11-13

05:29 Slewing to UM_wd (1.2" slit, blue-only, 2x2 binning, a time-series of
      20, 180-sec spectra)
      acqBinoMODS ZTFJ0493351_spec.acq
      mods1b: 14 and 15
      offsetxy -0.925 11.894 rel 
      (I used '-y 11' as usual for MODS1, vs '-y 9' for MODS2, even though MODS1R
      was not used)
      16, looks good
      mods2b: 13 and 14
      15, looks good
      <~05:40 execBinoMODS ZTFJ0493351_spec.obs
      Avg FWHM ~ 0.62" on both SX and DX guiders
      mods1b: 17-36
      mods2b: 16-35

07:00 Slewing to ND_lamost (0.8" slit, dual grating, 1x2 binning, a
      time-series of 37, 180-sec spectra)
      acqBinoMODS lamost_pa-60.acq (guide star R=12.5)
      FWHM on the guider images is ~0.8"
      mods1r: 18 and 19
      offsetxy -0.925 11.894 rel
      20, looks well-centered
      mods2r: 18 and 19
      offsetxy 3.845 8.234 rel
      20, looks well-centered
      execBinoMODS lamost.obs

07:39 FWHM on the guide stars is ~0.8-0.9". It is varying a bit.

08:13 as the object has risen, the FWHM on the guiders has improved - now
      ~0.66"/0.7" on SX/DX

08:43 FWHM on the guide stars is 0.64"/0.71" on SX/DX… DX starting to have a
      bit higher FWHM than SX.

09:29 FWHM on the guide stars is 0.67/0.72" on SX/DX, 
      mods1r 21-57, 60 (3 more while waiting for mods1b)
      mods1b 37-73
      mods2r 21-57, 59 (2 more while waiting)
      mods2b 36-72, 74 (2 more while waiting)
      acqBinoMODS lamost_pa-10.acq (guide star R=14.6) - swing in parallactic on long visit
      mods1r: 61 and 62
      offsetxy -0.619 11.554 rel
      63, looks pretty well-centered
      mods2r: 60 and 61
      offsetxy 4.212 8.12 rel
      62, looks pretty well-centered
      execBinoMODS lamost.obs 
      exposures started ~10:05 and 10:07 on MODS1 and MODS2

10:12 FWHM on the SX/DX guide stars is 0.60"/0.65"

10:55 FWHM on the SX/DX guide stars is 0.59"/0.57" 

11:39 18-deg twilight (occurred during the time-series)
      mods1r: 64-91
      mods1b: 74-99
      mods2r: 63-90
      mods2b: 75-101

12:04 David is closing up