Date: 2021 Jan 06 UTC
LBTO Observer: Olga Kuhn 
Observers: Mark Whittle (UVa), Rick Pogge (OSU)
Remote Participants: Kyle Corcoran (UVa)
TO: Josh Williams
Special Assistant: Trim

All observing is remote in C-19 mode.

Moon phase:
   Last-quarter moon (50%) rising ~midnight.
   Twilight at ~0155UT evening, 1252UT morning


Summary:
   Middle gray time, started with MODS, seeing was terrible (2-3") so
   switched to LUCI so while ~2" visible, better at IR, then back
   to MODS, seeing now 1" or so, then to LBC until dawn.  Clear all
   night, no clouds.

   Instruments: LUCI1+2, MODS1 R+B, MODS2 B, LBC Blue+Red (Blue is back!)
   Unavailable: MODS2 Red (suspected dewar leak)
   

Calibrations: 
   LBC V+I, B+I, and Us+I sky flats (dawn)
   LUCI Darks (UVa_nirjets/nirjetsLS, UVa_BCD_LUCI)
   

Executed Programs:
   MODS:
     ND_merger (visit 2)
     UM_Dwarfs HS0837 (do-over, previous night compromised)
     OSU_XMDs SBS0940
   LUCI:
     UVa_nirjets AFGL4029 (imaging)
   LBC:
     OSU_monitor, N3344, N4395, N4449, N4236, N4605, N4736


Time Lost:
   None, poor seeing but worked around it



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

Instrument: MODS1R+B/MODS2R

00:56 - opening
01:15 - pointed and collimated near first target
01:26 - 12-degree twilight

ND_merger, visit 2 of J0053

01:30 - Slew to J0053 with PA=-40 wait for twilight, let WFS settle.
        Seeing started ~1.1-arcsec, occasional puffs to 1.9-arcsec

01:56 - 18-degree twilight

02:00 - Start of science observing, seeing ~1.8-arcsec

03:14 - guide star jump briefly 1.5-2 arcsec seeing

04:15 - done

Flux Standard: G191B2B

04:15 - Slew to G191B2B

04:36 - mods1 dual mode, mods2 blue-only calibs, seeing ~2-arcsec

---------------

04:45 - reconfiguring for LUCI (hoping for better seeing in IR)

05:06 - checking collimation near narget (AFGL4029), DIMM reading
        seeing of 2.5:, FWHM visible-light on AGw units is ~3-arcsec

UVa_nirjets AFGL4029

05:12 - starting imaging scripts: K+K, 1.3-1.4-arcsec

05:34 - Br-gamma + H_2, 1.3-arcsec

06:01 - J+H - 1.2-arcsec

06:02 - Pa-beta + FeII, 1.4-arcsec

06:44 - done

ALTA predicts seeing getting better and we've seen guider seeing
improving steadly from 3-arcsec to 1.5-arcsec during this visit.

Primary mirror temperatures are ~0.8C above ambient, arguing against
going to LBC until they settle.  Temp dropped by ~3C during the past
4 hours.

---------------

06:50 - Reconfiguring back to MODS

07:07 - checked pointing and collimation near HS08327

UM_Dwarfs, HS0837

07:10 - slew and acquire, seeing 1.2-1.4 arcsec, much improved

07:25 - starte science observing, seeing 1-arcsec to 0.9-arcsec

Spectra look *much* better than the previous night, good continuum (a
science requirement) and superior line contrast.  Do-over was
justified.


OSU_XMDs SBS0940

08:36 - slew and acquire, PA=-155, seeing about 1-arcsec

08:48 - started science observations (3x1200s, dual grating)
        seeing 0.9-arcsec at start, variable during 2nd, ended ~1.1-arcsec

09:55 - done

---------------

Primary mirrors are equilibrated, reconfiguring for LBC

09:55 - reconfigured for LBC-R+B, we have B back tonight!

OSU_monitor

10:15 - N3344, problems with few stars on focus images, slow convergence

10:33 - start science, seeing 1-arcsec on LBC-B, but 1.5-arcsec on LBC-R

11:05 - N4395 slew, lost x2go session to "robs" machine, restart link

11:20 - N4395 focus field 1-arcsec seeing

11:29 - start science, seeing 1.3-arcsec

11:40 - Done

11:47 - N4449, seeing 1.3/1.2-arcsec blue/red

12:03 - N4325, first images poor seeing of 1.8-arcsec

12:21 - N4605 - seeing 1.5-arcsec

12:45 - N4736 - seeing 1.2-arcsec (worse on blue)

12:55 - 18-degree dawn

13:10 - Done

------------------------------
Calibrations

LBC Twilight Sky Flats, Blank Field 12+54
   V+I PA=0
   V+I PA=180
   B+I PA=180
   Us+I PA=180
   Us+I PA=0 (I starting to saturate)

LUCI Darks
   UVa_nirjets
   UVa_nirjetsLS
   UVa_BCD_LUCI