Observers: G. De Rosa, S. J. Schmidt Telescope Operator: S. Allenson Support Astronomer: M. Edwards Instrument: LUCI-LBC Summary: UT 00:12, dome opened. Began observations with LUCI due to target distribution; observed UVa_BCD targets, then switched to imaging camera for UVa_MIRCluster. Seeing was variable during our imaging observations. At UT 4:58, we asked to switch back to N1.8 for spectroscopy - the switch caused a software failure that was solved by UT 5:42. We attempted to observe AZ_Lensspec but couldn’t find the target based on the finding chart. Observed another UVa_BCD target; forgot to observe telluric standard star . At UT 6:59 we switched to LBC. First observed ND_oldsn; seeing varied from 0.9” to 1.1”. Then observed the UM_SBSS targets until UT 11:30. Our last program was OSU_Monitor, we observed N4258 with seeing was ~1” in the blue and ~0.9” in the red. We obtained sky flats in r’ and i’ filters, and with V and R. Weather: Afternoon, thin cirrus overhead, few clouds at the horizon. At sunset, dome open, clear ahead, cirrus and clouds sat the horizon, but the satellite images looked ok. Conditions were stable through the night: clear sky, humidity <60%, light wind at the beginning, calm during the second part of the night. UT 01:15 seeing 0.9 in optical (guiding) UVa_BCD/J2104 -- clear ahead, cirrus at the horizon UT 01:15 -- slew to telluric standard HIP202260 acquisition-- star saturated, move in y direction of 24” in order to avoid persistence executing obs -- exposure too long, non linear regime change DIT=8 sec, y offset -50” in order to avoid persistence run script again we have changed the exposure times for all the telluric standard stars in the program in order to avoid saturation/non-linearity UT 01:33 -- slew to science target -- seeing 0.95 in optical (guide star) acquisition UT 01:50 -- blind offset UT 01:51 -- executing OB The source trace is clearly visible in the differential image. It looks like there are two close sources since we can clearly detect two traces that are stable over many differential images. The second to last exposure may be slightly problematic - seeing jumped up to 2.3” for a few minutes due to a collimation problem. We did not see this issue until after we slewed to the next target - NOTE TO THE PI: please check to be sure that data are good. UVa_BCD/HS2236 -- clear UT 02:26 -- slew to standard (BD+14_4774) UT 02:35 -- stated standard observation script. UT 02:38 -- slew to target (HS2236), seeing of 0.85” in the optical (guide star) UT 02:53 -- started science observations seeing in optical varying from 0.7” to 1.1” Couldn’t see a trace in a subtracted image, probably due to target faintness since offset star was very well centered on slit. DIMM seeing 1.2 stable UT 03:16 slew to zenith to change camera UVa_MIRCluster -- GLM123 UT 03:21 slewing to target J image -- seeing measured on images UT 03:30 seeing 1.1” UT 03:35 seeing 1.1” UT 03:37 K image UT 03:41 seeing 1.16” iraf not working properly UT 03:47 seeing 1.” UT 03:51 seeing 0.9” Images might have focus issues (optical seeing variable) UVa_MIRCluster -- GLM125 J image UT 03:55 slew UT 04:00 seeing 1” UT 04:04 seeing 1.4” UT 04:07 seeing 1.1” UT 04:08 seeing 1.4” UT 04:08 -- Ks image First image: seeing 0.9” UT 4:14 seeing 0.95” UT 4:16 seeing 0.95” UT 4:20 seeing 0.9” UT 4:24 seeing 0.95” Seeing seems to have stabilized in the K band, but the guider is still showing variable 1.2” - 1.7” in the optical. Because the current data looks good and imaging allows us to monitor the seeing in real time, we chose to stay with UVa_MIRCluster. J band image: GLM128 iraf outputs a seeing of 0.9”, but the stars are elliptical in the image (throughout J band observation, every image checked yielded same) UT 4:38 guider seeing shows closer to 1.1” - 1.3” (smaller than previous) UT 4:41 K band image UT 4:45 seeing on image ~0.8” (stars slightly elliptical) UT 4:50 seeing on image ~1” (stars slightly elliptical) UT 4:55 seeing on image ~0.8” (stars slightly elliptical) seeing still highly variable. Switch to lower priority-bad weather program and check if it stabilizes UT 04:58 Slewing back to zenith to change the camera to N1.8 for spectroscopy camera and filter wheel failure. Issue not easily solvable. Given the LBC target distribution and the variable seeing we decided to try to recover the issue instead of switching to LBC. In the meanwhile seeing stabilized: DIMM seeing ~0.8 UT 05:40 LUCI issue solved, DIMM seeing stable ~0.8 UT 5:42 AZ_Lensspec/J0134-0111_offset.acq Bad finding chart; we were not able to find the source. Spent 10 min there, decided to move on to something else. Also, execution time in the queue is half of what requested by the PI. UT 05:55 move to UVa_BCD/SBS0335 Long acquisition due to faint target and blind offset, we were very careful in aligning the slit UT 06:26 Science script, optical seeing stable 0.8” UT 06:50 Optical seeing stable 0.8” trace not visible in differential images, but target is faint After we began the switch to LBC, we realized we completely forgot to obtain the standard observations. GDR and SJS apologize - we were distracted by attempting to get scripts in order for non sidereal LBC observations. We will re-run the observation during the next days. UT 06:59 switch to LBC issue while switching to LBC UT 07:25 ND_oldsn/sno0ig_VI Missing focusing field, needed for co-pointing UT 07:30 running focus and pointing on a bright star close to the field UT 07:38 pointing UT 07:44 science -- ND_oldsn_sn09ig_VI DIMM seeing 0.9” seeing blue 1.2” seeing red 1.” seeing blue 1.1” seeing red 0.9” seeing blue 1.2” seeing red 1” -- blue PSF slightly elongated UT 08:12 clearing optics given the slightly elongated blue PSF ran dofpia to get the seeing back, then slewed to focus field and co-pointed and ran again UT 08:21 UM_209P -- focus OB -- focusing UT 08:28 pointing UT 08:40 ran 209P.ob (209P is visible in position indicated by ephemeris) UT 08:52 ran SA95-218-VR UT 08:58 ran 209P.ob UT 09:10 ran SA95-218-VR -- DIMM seeing 0.75” UT 09:16 Focus OB -- focusing UT 09:25 pointing UT 09:28 ran 209P.ob UT 09:41 ran non-sidereal observing (believe we found circular image of comet with reference to surrounding elliptical stars) UT 10:13 ran pointing and focus obs for QJ142 UT 10:27 ran QJ142_2 noticed a bright diffraction spike is nearly overlapping with target - PI must check UT 10:42 ran SA95-218 note: airmass of 2 for standard, why is it not closer to target? UT 10:48 ran QJ142_2 UT 11:03 ran SA95-218 UT 11:08 ran QJ142_2 UT 11:31 ran NS_QJ142 (with non-sidereal gui, found round image with surrounding stars, etc.) UT 11:48 slew to OSU_monitor focus script for N4258 Focus object finding chart had wrong object marked - we caught it - if we hadn’t, we would have had to reset the telescope pointing. UT 12:08 started science observations for N4258 UT 12:14 1” in the blue, 0.8” in the red UT 12:21 0.9” in the blue, 0.8” in the red UT 12:28 1” in the blue, 0.8” in the red UT 12:35 1.1” in the blue, 0.8” in the red (slightly elongated) (note - past 12 degree but sky is still dark according to sky brightness monitor) UT 12:43 1.2” in the blue, 0.9” in the red finished at UT 12:44 (sky brightness 21.32) SKYFLATS UT 13:16 r’ and i’ skyflats with 8 and 6 second exposures (15000 to 30000 counts) UT 13:20 r’ and i’ skyflats with 6 and 4 second exposures (stopped b/c we realized we were repeating the same pattern - might work, might not) UT 13:23 r’ and i’ skyflats with 4 and 2 second exposures (a few good ones - maybe too bright) UT 13:25 V and R skyflats with 2 and 1 second exposures - too many counts in blue UT 13:28 V and R skyflats with 0.5 and 0.5 second exposures 5 good i' SDSS 3 good R bessel 5 good r' SDSS 2 good V bessel