RFBG Commissioning with Adaptive Secondary - 27 March 2010 UT

Night 8:

Observer: DMiller, JHeidt, FBian (LBTO)
Telescope Operator: DHuerta
Software:
Instrument Support:: TShih
Telescope Support: JUrban
Adaptive Support: GBrusa (LBTO)

Summary

No observations, strong wind all night

Preparations

Thorsten did GCS-fix for the X-axis collimation problem last night.

Single frame names refer to: irtc.20100327.xxxxxx.fits

Cube names refer to: irtc.20100327_00xxx_cube.fit

Plan for the night:

Do a large set of transformation data, collect field aberration measurements (tip) if seeing is good

Do pointing model observations if seeing is poor

Details

Open

01:45 Tried to open, problem with the left shutter door, reset motor at Level 10, OK, vent doors closed due to wind

Weather: clear (looks photometric) , T_out = -5C, T_Mirror = -0.3C, Hum = 60%, windy, but has decreased during the day to 15 m/s, so no concern for the night

Initial Pointing and Collimation Adjustment

Each night in this RFBG commissioning run, we go to a bright star (Pollux) at Elevation 80 degrees. Then we adjust the vertex tip-tilt (RX/RY) of the secondary to get rid of the coma that we see in the extrafocal pupil on the IRTC.

02:20 pointto Pollux gs=0, TelM = track, PAMode=no, EL = 82, OK, star there, adjust *CA=-65 ,IE=-55*
Looks OK, so didn't change parameters, DX M2 Global X = 2.5, Y = -3.63, Z = 1.9, RX = -360, RY = -120

02:29 pointto M5_1210 gs=0, TelM = Track , EL = 26, AZ = 172, at very-low elevation to adjust AZ-zeropoint, star not there, but no surprise since its 5deg colder compared to last night.

02:50 Close dome, wind went above 20 m/s

04:00 Wind low again, reopen, shell flattened at 20degs elevation

04:10 pointto Pollux gs=0, TelM = track, PAMode=no, EL = 82, OK, star there, adjust *CA=-86 ,IE=-64, IA=-314*
Looks OK, so didn't change parameters,

04:17 pointto M5_1210 gs=0, TelM = Track , EL = 24, AZ = 172, at very-low elevation to adjust AZ-zeropoint, star found at IA= -375, i.e. we observed the opposite of what John Hill has found a few nights ago: i.e. if temperature goes down, IA goes down as well. Seeing is poor, extrafocal images almost larger than FOV, no change of global parameters.

04:36 pointto M5_0354, GS=0, TelM=track, check for pointing near Stone-G, OK, CA=-73, IE=-64

04:42 pointto BS9126, GS=0, TelM=active, check for collimation/seeing, seeing looks pretty bad (Guider reports 2-3" strongly variable), not much we can do, probably a combination of dome seeing and external seeing (T_out = -4.4, T_Mirror = -2.5, vent doors closed)

04:55 pointto BS9126, GS=15, TelM=active, PA=INDEF, see if Thorstens fix helps, Doug is monitoring

05:05 Wind again high, closed

05:45 Wind less strong, give it a try...

05:51 pointto BS9148, GS=4, TelM=active, PA=INDEF, see if Thorstens fix helps, Doug is monitoring, stopped again for 30min due to wind.

Photometric zeropoints of IRTC in J and H

06:20 Open again, seeing still lousy, but its photometric, so lets take a few Persson stds in J and H for photometric calibration of IRTC, seeing ~ 2", always 30*2sec+ 1*2sec single image

06:37 BS9148, EL=82, H, 063741 cube 179

06:40 BS9148, EL=82, J, 064007 cube 180

06:41 Muppet show, dome open, dome closed....this time closed...wind too strong

Wind was too strong the rest of night, T_out=-6.5, T_Mirror=-3.0, Hum=60%, Wind > 20 m/s, sky is clear

-- JochenHeidt - 27 Mar 2010
Topic revision: r4 - 27 Mar 2010, JochenHeidt
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