AZ Lucifer run - Night#4

Observer: Olga, Ian, Wiphu; TO: Steven Allason

23:25UT / 16:27 local - take test exposures based on actual science script (but with blind mask in) to check if there is any internal scatter light. The brightness in the dome is comparable to night sky (~21 mag/sq.")

01:55UT start configuring Lucifer for flats

Flats: img#, filter / counts

High flats

#15 - 23: Ks flat / 13000 - 9500

#24 - 33: Ks flat / 9000 - 7000

#34 - 43: H flat / 14000 - 10200

#44 - 53: H flat / 10000 - 6600

#54 - 63: J flat / 9300 - 6400

#64 - 73: J flat / 6000 - 4200

Low flats

#74 - 83: Ks flat / 4300 - 4000

02:44UT execute A851 acq*

02:58UT execute A851 sci / 0.6" guider seeing / twilight sky brightness 19.8 mag/sq."

03:29UT ==== Astronomical Twilight ====

03:58UT execute cal* acq and sci for A851

04:11UT Ian's QSO -- seeing ~0.8''

04:23UT z-band imaging of J0946 -- seeing varied a bit

04:27UT J-band imaging -- looks great! quasar images clearly resolved from galaxy

04:33UT H-band imaging

04:39UT Ks-band imaging

04:50UT start spec acquisition

05:08UT start HK spec -- argh! guide star just blew up, temperature dropping rapidly

05:27UT temperature has suddenly dropped about 2 degrees in 5 minutes. Seeing went from 0.7" to >3". Aborted.

05:32UT execute GN26 acq / seeing 2" to >4"

05:49UT started GN26 exp. We didn't really see anything last time in this seeing, but let's try anyway / seeing 3"-4"

06:01UT >4" seeing - lose wavefront sensing. Aborted.

06:31UT attempt to execute A1835 acq. Can't see 15 mag acq* in 1 minute exposure. 4" seeing. Need to take 2 min images and sky subtract to see mag 15 acq*.

06:56UT attempt sci script in 4" seeing. Wind picking up from 5-10 m/s to almost 20 m/s quickly.

07:36UT closed dome due to wind > 20 m/s

09:10UT tried to open dome again. The air has also suddenly warmed up (~2 deg C) and sustained wind is 17 m/s. > 4" seeing and highly variable. Can't collimate yet as of 09:53UT. Target is setting below airmass 1.7. Aborted. No other targets for this seeing.

10:24UT constantly fluctuating seeing (3" to > 5"). Give up for the night.

The temperature fluctuation is very interesting. Note the Milky Way in perfectly clear sky ... Photo%20May%2003%2C%202%2025%2009.jpg

-- XiaohuiFan - 02 May 2011
Topic revision: r5 - 04 May 2011, XiaohuiFan
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