CFHT, Instruments, Spectroscopy, Gecko: The Coudé f/4 Spectrograph

Gecko Runs for July 2002 with the MAIN fiber


Weather

  1. C9 Shkolnik - July 25/26, photometric, seeing variable 0.4-0.7", some periods of very patchy thin cirrus passing over
  2. C9 Shkolnik - July 26/27, fog until 00h30, photometric 2d half of the night, 0.9"
  3. C9 Shkolnik - July 27/28, not quite photometric, 0.6" stable seeing
  4. C9 Shkolnik - July 28/29, photometric, 0.6" stable seeing
  5. C9 Shkolnik - July 29/30, photometric, 0.6" stable seeing
  6. F21 Monier - July 30/31, photometric, 0.6-0.9" seeing, observers report flux decreasing in their science exposures...
  7. F21 Monier - July 31/1, photometric, 0.7-1.0", observers report flux decreasing in their science exposures...


Check every night or so for: Get the images in the archive: /h/archive/current/2002ac9 and 2002af21.

BIAS LEVELS with EEV1

Date Image(s)Bias: min-maxBias: meanNote
Jul 29 05:54 648613b.fits-648622b.fits 427.2-427.6 427.5 N=10
Jul 29 12:14 648661b.fits-648680b.fits 427.6-427.9 427.8 N=20
Jul 30 05:55 648753b.fits-648757b.fits 427.4-427.7 425.5 N=5
Jul 31 06:57 648938b.fits-648946b.fits 427.8-428.1 428.1 N=9



THROUGHPUT MEASUREMENTS

RECIPE:
  1. Select object exposures (hselect *o.fits $I,OBJECT,INTTIME,AIRMASS,WAVELENG yes)
  2. Combine BIASES (epar imcombine with input_list=@ListBias output_image=Bias.fits combine=average reject=minmax nlow=0 nhigh=1 blank=0 scale=none)
  3. Subtract BIASES (imarith Image - Bias NewImage)
  4. Change DISPAXIS to 2 if necessary (hedit)
  5. APALL object spectra
  6. noao.plot if necessary
  7. IMSTAT (-> mean in ADUs/col), select lines if necessary (imstat Image.ms[2000:3000])
  8. Multiply by GAIN=1.8021 (-> mean in e-/col)
  9. Divide by INTTIME (-> mean in e-/col/sec)
  10. Adjust to MAGNITUDE 0 (multiply by 10^(mag/2.5))

Flats could change some throughput values!


Date Image Spectro-
graph
Wave-
length
Order Filter/
Grism
Star (mag) Airmass INTTIME Throughput
Jul 28 19:53 648559o.fits UV 3947 14 UV Vega (U=B=0) 1.33 10 22000 (at max)
Jul 28 03:12 648459o.fits UV 3947 14 UV 51 Peg (U=6.4, B=6.2) 1.00 1200 23000 (at max)
Jul 29 03:13 648588o.fits UV 3947 14 UV 51 Peg (U=6.4, B=6.2) 1.00 1200 22000 (at max)
Jul 30 02:25 648726o.fits UV 3947 14 UV 51 Peg (U=6.4, B=6.2) 1.02 1240 23000 (at max)
Jul 30 20:04 648886o.fits UV 3635 16 UV Vega (U=B=0) 1.23 60 500 (average col 1000-4000)
Jul 30 20:12 648887o.fits UV 3635 16 UV HD143807 (U=4.7) 1.02 1200 600 (average col 1000-4000)
Jul 30 22:07 648897o.fits UV 3930 14 UV HD190229 (U=5.0) 1.10 1200 13500 (average col 1000-4000)
Jul 31 22:58 649004o.fits UV 4040 14 UV HD190229 (U=5.0) 1.02 1200 6500 (average col 1000-4000)
Aug 1 0:55 649009o.fits UV 4040 14 UV HD209459 (U=5.5) 1.03 1200 7200 (average col 1000-4000)
Aug 1 1:31 649014o.fits UV 3930 14 UV HD209459 (U=5.5) 1.01 1200 10200 (average col 1000-4000)
Aug 1 2:30 649022o.fits UV 3635 16 UV HD209459 (U=5.5) 1.03 1200 340 (average col 1000-4000)



http://www.cfht.hawaii.edu/Instruments/Spectroscopy/Gecko/REPORTS/02A-july.html
Send comments to: Nadine Manset
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