01/03/2021 Civil 
Brotherton @ longslit (remote)
Outside Temp(F) -- 16 (Start) 
Outside Humidity(%RH) -- 76 (Start)
Wind Speed(MPH) -- 20 mph (Start)
Wind Direction -- 276 (Start)

Slit width 5 arcsec, set on September 17, 2020 empirically

900l/mm grating, sub-array center column 1050, width 360

Longslit focus set to 310 on instrument.

Seeing= 7.76 pix (0.38 arcsec per pixel) or 2.9 arcsec focus (temp 19C)

Centered for field, collimation numbers
at Dec 60:38   HA 0:14
0:00:50.9   -1:04:58.0

Fill LN2 #2 (17:30)

Flat at fixed -6.25 48, dome 15

Index	 	Object		EXP	secz	UT	T-Out 	Notes
------------------------------------------------------------------------------
a001-10		Flat		3		1:33		20

a011-20		CuAr		2		1:43		20

a021-30		bias		0		1:48		20

Waiting on humidity to drop
Skies clearing, humidity 79%, mirror clear, open...

a031-33		Feige34		60		8:29	19	std
seeing is 2.9"

a034-36		IRAS05589+2828	300	1.22	8:40	19	snr=23

a037-39		Mrk79		300	1.03	8:58	19	snr=30

Weather station appears to have died for tonight...
Humidity has likely gone back up based on all-sky camera...

Mirror check.  There is a little blown snow.  Leave flats on and wait.

Try flats...

a040-49		flats @0 -25	3	2.47	9:21	?	Look ok
Looks like hint of frost.  Wait with flat lamps on.  Humidity dropping...a

trying again...

a050-52		Mrk704		400	1.27	11:41	?	snr=25+

a053-55		Feige34		60	1.05	12:03	?	std, seeing 2.4"

mirror check -- frost gone, tiny amount of blown snow as before

a056-58		NGC3227		300	1.16	12:13	?	snr=35+

a059-61		PG0923+129	300	1.49	12:32	?	snr=30

a062-64		NGC4151		100	1.01	12:52	?	snr=60+

a065-67		NGC3516		250	1.18	13:01	?	snr=40+

a068-71		Mrk876		300	1.22	13:18	?	snr=25

Last exposures in twilight