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

Gecko Runs for Semester 2001A


Weather

  1. C37 Fullbright - April 4/5 - Photometric all night.
  2. C37 Fullbright - April 5/6 - Photometric at dusk, but less at dawn - telescope probably not focussed properly because the EM was not used.
  3. C37 Fullbright - April 6/7 - Not photometric at dusk, very close at dawn.
  4. C9 Landstreet - April 7/8 - Was not photometric at sunset or sunrise.
  5. C9 Landstreet - April 8/9 - It was not photmetric at sunset or sunrise as there was some cirrus around all night.
  6. C17 Bohlender - April 9/10 - Photometric at sunset, closed at 3h30 because of fog.
  7. C17 Bohlender - April 10/11 - Lost to fog.
  8. D - Manset - April 11/12 - Not photometric, cirrus everywhere the whole night.



Check every night for:


BIAS LEVELS with EEV1

Date Image(s)Bias: min-maxBias: meanNote
Mar 30 09:45 579926b.fits --- 433.3 ---
Mar 30 09:56 579928b.fits --- 430.7 ---
Apr 4 13:14 580331b.fits --- 430.4 ---
Apr 4 17:36 580333b-343b.fits 430.5-431.0 430.9 N=11
Apr 5 16:05 580454b-464b.fits 430.3-431.0 430.8 N=11
Apr 6 15:36 580500b-510b.fits 430.8-431.3 431.2 N=11
Apr 7 18:43 580569b.fits --- 430.8 ---
Apr 8 5:38 580665b.fits --- 430.5 ---
Apr 10 04:13 581000b-019b.fits 430.1-430.7 430.6 N=20
Apr 10 19:06 581122b-131b.fits 429.9-430.4 430.3 N=10
Apr 11 18:10 581152b-162b.fits 429.9-430.4 430.3 N=9



THROUGHPUT MEASUREMENTS

RECIPE:
  1. Combine BIASES (imcombine combine=average reject=minmax nlow=0 nhigh=1 blank=0 scale=none)
  2. Subtract BIASES (imarith Image - Bias NewImage)
  3. Change DISPAXIS to 2 if necessary (hedit)
  4. APALL object spectra
  5. IMSTAT (-> mean in ADUs/col)
  6. Multiply by GAIN=1.8021 (-> mean in e-/col)
  7. Divide by INTTIME (-> mean in e-/col/sec)
  8. Adjust to MAGNITUDE 0 (multiply by 10^(mag/2.5))


Date Image Spectro-
graph
Wave-
length
Order Filter/
Grism
Star (mag) Airmass INTTIME Throughput
Apr 4 20:17 580370o.fits Red 6330 9 1604 Xi Ori (4.5) 1.3 60 34777
Apr 4 20:32 580372o.fits Red 6330 9 RED Xi Ori (4.5) 1.3 60 29201
Apr 4 22:44 580379o.fits Red 6330 9 1604 Alpha Leo (1.4) 1.1 10 36843
Apr 5 02:03 580391o.fits Red 6330 9 1604 HD122563 (5.4) 1.0 900 19450
Apr 5 03:54 580395o.fits Red 6330 9 1604 109 Vir (3.7) 1.1 900 25203
Red 6330 9 1604
Red 6330 9 1604



http://www.cfht.hawaii.edu/Instruments/Spectroscopy/Gecko/
Send comments to: Nadine Manset
Copyright © 1996, 1997, 2000, 2001. CFHT Corporation. All rights reserved.