Observers: R. Pogge (OSU), E. Huff (OSU), E. Skillman (UMN) Support Astronomer: Dave T. Telescope Operator: Geno Beccheti K Summary OSU/RC MODS1 observing from sunset until 2am, then PEPSI FPU commissioning at the end of the night after moonrise thru dawn. Seeing was very good, mostly sub-arcsecond with a couple puffs above 1-arcsec when warm air blew over us. Transparency very good, but maybe some thin stuff along with the seeing puffs. Completed two CHAOS targets, highest priority fields for NGC4254 and NGC5055 which complete those galaxies. Time enough for a single standard star in twilight and ND_COSLLS high-priority target J1607+1846. MODS1 performed very well. Calibrations will be taken later. As per time allocation, we handed off the telescope to the PEPSI team (J. Storm and I. Ilyn) for PFU commissioning at 2am. Will be coordinating this thru Sunday (PEPSI folks leave Monday). Details: All times are UTC unless otherwise indicated Configured for MODS1 01:42 - Shutter doors opened, some clouds but mostly daytime solar cumulus, so should be gone soon. Winds calm, humidity 38% 7C at sunset, chamber at 5.5C and warming mirrors to catch warm 02:24 - Collimation star - VS 9148 02:52 - Significant offset in temperature between mirror and ambient. Mirror temperature map looks pretty nasty (warm center) 03:03 - acquire Feige 34 - dual grating calibration 03:12 - start integration (3 x 2 minutes) (0.7 arc sec seeing) 03:23 - acquire NGC 4254 field 4 03:37 - begin (6 x 20 minutes) (0.8 arc sec seeing at begin) over the course of the observations the seeing crept up to ~0.8. 05:47 end of NGC 4254 field 4 exposures 05:49 acquire NGC 5055 field 2 06:07 start integration (6 x 20 minutes) (0.7 arc sec seeing) actually, it looks like 0.9 arc sec seeing 06:52 actually, it looks like 1.4 arc sec seeing settling back to 1.1 - 1.2 07:19 settling back down to 0.7 08:18 end of NGC 5055 field 2 exposures 08:20 acquire J1607+1846 08:31 start integration of J1607+1846 2 x 10 minutes blue grating only, 0.3 arc sec slit seeing 0.8 at start ending at 0.7 08:55 end of J1607+1846 integrations 09:00 - Hand off to PEPSI Team