WIYN Night Log (13 Aug 2026 - MST)

WIYN Night Log for (13 Aug 2026 - MST)

Possible Observing Hours: 8.25 18° Twilight (plus 0.5 hour) – Evening: 20:26 PM, Morning: 4:37 AM (mst) [Report time: 05:46 2026-08-14]

Hours used for:
Science	0.00
Optical Tuning	0.00
Calibrations	0.00
Engineering	8.25

Unsused Hours:

Time Not Used	0.00 (total)
	Telescope Overhead	0.00
	Telescope Transition	0.00
	Instrument Overhead	0.00
	Idle Time	0
	Closed	0.00

Hours lost to:
Bad Weather	0.00
Technical Problems	0.00 (total)
	No Category Specified	0.00

Possible hours rounded to nearest quarter hour.
Total hours recorded will be within 0.13 hr. (7.5 min.).

Institution	See Remarks
Observer(s)	No Observer
Instrument(s)	[No instrument or port used, 100%]

Operator(s)			Thaxton Mountain

Remarks	WIYN is shutdown for summer maintenance. No night time operations. Would have lost about 2.5 hrs to weather.
Weather Comments	Threatening clouds at the start of the night, became cirrus by about 23:00. Winds were about 10 - 40 mph. Humidity was about 50% - 85%.
Image Quality Comments	No seeing measurements.

Extra Science Time	0.00 hours. (Science done during twilight. Not included in overall totals for the night)

Comments to heidi.schweiker@noirlab.edu

DIQ data

DIQ Measurements - from INFORMS - 2026-08-14 UT
UT Time	FWHM	Exposure Type	Filter	Exposure Length	Air Mass	Wind Direction	Wind Speed

Weather data

WIYN Weather Averages From: UT = 01:00 (MST=6:00 PM) To: UT = 13:00 (MST=6:00 AM)
Elements	Mean	High	Low	AvDev
Outside Air Temperature (°C)	17.2	19.7	16.2	0.6
Dome Air Teperature (°C)	24.7	28.1	0	1.1
Outside humidity (%)	74.4	85.2	62.3	4.8
Dome humidity (%)	52.4	56.8	0.0	3.0
Wind Speed (mph)	11.7	23.7	3.9	2.6
Wind Direction (°)	195.3	343.8	160.4	191.9

Auto-weather Entries - from INFORMS 2026-08-14 UT
UT Time	Wind Direction	Wind Speed	Outside Temerature	Dome Temperature	Outside Humidity	Dome Humidity	Sky Condition	Precipitation
00:40:17	200.5	9.7	21.3	27.7	57.8	42.9
01:40:18	206.3	14.2	18.2	27.7	83.6	44.8
02:40:18	206.3	12.3	18.2	26.1	77.1	48.5
03:40:18	229.2	16.2	18.6	25.9	81.1	51
04:40:18	194.8	7.8	18.5	25.3	82.8	52.3
05:40:18	189.1	12.4	17.9	25.2	91.8	53.8
06:40:18	183.3	13	17.2	24.7	99.9	55.2
07:40:18	171.9	12.6	17.3	24.4	84	56.7
08:40:18	177.6	9.9	17.5	24.3	72.9	54.8
09:40:18	189.1	7.9	17.6	24.2	79.4	54.2
10:40:18	183.3	9.1	17.2	23.3	76.3	54.7
11:40:18	183.3	14.3	17.2	23.6	88.7	54.6
12:40:18	189.1	11.7	17.2	23	89.2	55.3

WIYN weather plots from 6:00 PM to 6:00 AM (MST)

Temperature

Humidity

Wind Speed

Wind Direction