QSO J2051

Between 103010 and 105330 the loop was stopped and the star was re-acquired with a different orientation.

Cube 103010 may be bad.

Raw Data

TrackNo	RA/DEC	filter	exp	#frames	El	DIMM/OL	Mag	bin	#mod	freq	notes
pisces.20110612.0323.hdr.fits		Ks	60000	1							UT 09:46:18.429
pisces.20110612.0325.hdr.fits		Ks	60000	1							UT 10:00:33.402
pisces.20110612.0326.hdr.fits		Ks	60000	1							UT 10:01:40.313
pisces.20110612.0327.hdr.fits		Ks	60000	1							UT 10:02:47.183
pisces.20110612.0328.hdr.fits		Ks	60000	1							UT 10:03:54.55
pisces.20110612.0329.hdr.fits		Ks	60000	1							UT 10:05:00.980
pisces.20110612.0330.hdr.fits		Ks	60000	1							UT 10:06:07.892
20110612_100823	20:51:11 19:50:39	Ks	60000	6	74	NaN 0.44	12.8	2	145	625
20110612_101547	20:51:11 19:50:40	Ks	60000	6	75	NaN 0.38	12.8	2	145	625
20110612_112240	20:51:14 19:50:30	Ks	60000	6	75	NaN 0.49	12.8	2	145	625
20110612_102247	20:51:12 19:50:41	Ks	60000	6	76	NaN 0.73	12.9	2	145	625
20110612_103010	20:51:12 19:50:41	Ks	60000	6	76	0.87 0.49	12.9	2	145	625
20110612_111517	20:51:14 19:50:32	Ks	60000	6	76	NaN 0.61	12.6	2	145	625
20110612_105330	20:51:13 19:50:38	Ks	60000	6	77	NaN 0.49	12.8	2	145	625	Changed position angle
20110612_110053	20:51:13 19:50:37	Ks	60000	6	77	NaN 0.49	12.9	2	145	625
20110612_110816	20:51:14 19:50:34	Ks	60000	6	77	NaN 1.13	13.0	2	145	625

TrackNo	RefStar	Mag	El	Wind	DIMM/OL	Rec	bin	#mod	freq	gain	mod	nph	AntiDrift	SR	filter	exp	#frames	disturb	SN	notes
20110612_093010	???	8.8	59	11	0.96 0.50	092604	1	400	990	0.4 0.8 0.7	3	184	ON	32.2	FeII 1.64 um	2000	5	ONSKY	zero.fits	- SR may be in error - Warning: Selected pisces dark +4h old!
20110612_100101	???	12.8	73	4	NaN 0.51	180534	2	145	625	1.2 0.8 0.6	3	29	ON	20.8	Ks	60000	6	ONSKY	zero.fits
20110612_100823	???	12.8	74	5	NaN 0.44	180534	2	145	625	1.2 0.8 0.6	3	30	ON	18.2	Ks	60000	6	ONSKY	zero.fits
20110612_101547	???	12.8	75	7	NaN 0.38	180534	2	145	625	1.2 0.8 0.6	3	31	ON	17.1	Ks	60000	6	ONSKY	zero.fits
20110612_102247	???	12.9	76	8	NaN 0.73	180534	2	145	625	1.2 0.8 0.6	3	28	ON	16.8	Ks	60000	6	ONSKY	zero.fits
20110612_103010	???	12.9	76	9	0.87 0.49	180534	2	145	625	0.1 -1.0 -1.0	3	27	ON	19.5	Ks	60000	6	ONSKY	zero.fits
20110612_105330	???	12.8	77	6	NaN 0.49	180534	2	145	625	0.6 1.1 0.6	3	30	ON	14.0	Ks	60000	6	ONSKY	zero.fits	- Background correction failed
20110612_110053	???	12.9	77	5	NaN 0.49	180534	2	145	625	0.1 -1.0 -1.0	3	27	ON	17.2	Ks	60000	6	ONSKY	zero.fits
20110612_110816	???	13.0	77	6	NaN 1.13	180534	2	145	625	0.6 1.1 0.6	3	26	ON	16.5	Ks	60000	6	ONSKY	zero.fits
20110612_111517	???	12.6	76	8	NaN 0.61	180534	2	145	625	0.6 1.1 0.6	3	36	ON	15.0	Ks	60000	6	ONSKY	zero.fits
20110612_112240	???	12.8	75	9	NaN 0.49	180534	2	145	625	0.1 -1.0 -1.0	3	30	ON	14.5	Ks	60000	6	ONSKY	zero.fits	- SR may be in error

IDL string:['20110612_093010','20110612_100101','20110612_100823','20110612_101547','20110612_102247','20110612_103010','20110612_105330','20110612_110053','20110612_110816','20110612_111517','20110612_112240']

SR	0 (NaN)
SEEING (WFS)	0.569335 (0.205386)
SEEING (DIMM)	0.914026 (0.064817)

STAR POSITIONS

i vettori rispetto alla stella di guida sono
X: -11.6866 26.4658 -8.42934 5.67689 -19.8853
Y: 17.9272 -9.55767 24.4602 -2.35436 29.3370
in arcsec

Example image

Average of 9x6x60s frames, Ks

From the LBTO Twiki-Log:

Observation design

1 hour total integration in Ks.
Divided into 2 position angles 50 degrees apart (avoid 60 /120 deg symmetry of secondary)
Each half hour divided into 5 dither positions.
Take 6 x 60 sec exposures with PISCES at each dither position.

Observation

09:33 iif_preset, QSO, MODE=ACQUIRE, TS=1, GS=0, RS=0, ROTMODE=IDLE - (J.Hill object)

• using filter Ks
• choose PA to keep PISCES upright

09:40 iif_preset,QSO, MODE=ACE, GS=11, RS=1, PA=-70 - didn't find the guide star in a convincing manner.

09:41 correcting pointing - iif_preset,WT10_272, MODE=ACQUIRE, GS=0, RS=0, ROTMODE=IDLE

09:xx iif_preset,QSO, MODE=ACE, GS=11, RS=1, PA=-70

• irc_runao -sucess
• iif_offset, -5, -3, COORD='DETXY' - offset failed! We need to do closed loop offsets!

09:53 iif_preset,QSO, MODE=ACE, GS=11, RS=1, PA=-70

• iif_offset, -5, -3, COORD='DETXY' - Refused - because it found the loop paused (and considered it closed) - we send acquire_ref anyway
• irc_runao (and it worked because the reference star was still in the CCD47 field)

AO is running at 625 Hz, with binning=2, and correcting 153 modes.

PISCES is taking 6 x 60 sec exposures in Ks at each dither position (plus a couple test exposures at the beginning).
These are done with Alfio's closed loop script to dither and take PISCES images.
Five dither positions (on a 3 arcsec radius dice5) 0,0 3,0, 0,3 -3,0 0,-3.
Reference star is not in the PISCES field at this first Position Angle.
Seeing (without adaptive optics) in R-band is 0.6 arcsec on guider. Sky is photometric, perhaps slightly smoky.

IMPORTANT: Position Angles written in the PISCES headers are wrong by 90 degrees. (Use double stars observed earlier tonight to sort out the actual postion angles.)
Also note that the RA and DEC values are exchanged in the headers of these images. JMH: Based on the observations of binaries PISCES_13 and PISCES_14 the True Astronomical Position Angles on PISCES are 90 degrees more negative than what the presets and headers say. A preset to PA=90 gives a true PA of 0.

Each 60sec exposure has a mean count level of 1730+-30 ADU.
For the first dither position, the QSO is at pixel 353,245.
We believe the AO reference star is off to the lower left, but didn't verify this.
The QSO has peak counts (including background) of 5430 ADU. SIMBAD say the magnitude is K=15.7, J=16.7, V=18.5.
The QSO is 4 pixels FWHM (0.018 arcsec/pixel TBC) in image 326, while a perfect Airy pattern should be 2.9 pixels FWHM.

First dither (0,0) starts with image 325.
First data set ends with image 354.

WARNING: Beware that the delay between the closed loop dither offset and the first exposure was shorter than expected. This means that the first image in each dither position could be offset/trailed. We don't see any obvious evidence of this in quick-look reductions by Juan Carlos. JMH: Yes, in data reduction, we see double images in images 349, 363 and 381, so the effect is there.

10:39 iif_preset,QSO, MODE=ACE, GS=11, RS=1, PA=-20 (Changing Position Angle by 50 deg)

• irc_runao -sucess

Peculiar long integration (600 sec?) to start the next set. What causes this?? This is image 355 which appears to be a normal 60 sec exposure as viewed on ds9. So what was PISCES doing for 10 minutes? The sky/background counts in image 355 suggest that it was indeed a normal 60 sec exposure.

Image 356 is 10 sec to check the QSO position. It is the nominal positon of 225,486 pixels for the 0,0 dither.

357 is the first 60 sec exposure of the next set (PA=-20).
Second data set ends with image 386.
Twilight is starting to come up in the last ~10 exposures, but it doesn't affect the background levels in Ks.