Log Book Entry No.33

Days, Calendar Created: 14 Feb 2014 12:42:26 Days, Calendar Last Revised: 14 Feb 2014 12:42:26 Person LaurieNevay Text 20140213 LN Observation

20140213 LN

Reasonably clear and forecast to be good. Worth a try to get some practice in.

  • CCD at -15oC
  • Aligned to capella - very high in sky.
  • Went down from 46 to 37 DE to theta_aur as capella saturates the camera.
  • Take subframes to practice focussing. Recorded 400 frames of theat_aur for analysis later. SNR is good as super bright. Peak around 30000 ADU. Jumps around A LOT so will have to align by centroid. Then can have a look at PSF.
  • Exposure 0.1s
  • 300 exposures recorded in 10m12s
  • 400 exposures recorded in 13m37s *Sat bhatinov mask carefully on front of scope. Recorded 50 images with same setup as before. Not so clear.
  • Exposure 0.5s
  • Not so clear. Pattern seems very small indeed on CCD compared to internet images. Collimation is definitely poor and its windy so don't expect it to be great. Anyway, reasonably good in focus.
  • Having a look at the Pleiades. Too extended to see anything nice and certainly with the seeing. The stars are very bright and the nebulosity not so, so quite hard to observe under these conditions.

  • Imaged Andromeda ok. 30s exposures.
Back to: LogBookAstronomy

  • Theta Aur with Bhatinov mask:
    theta_aur_with_bhatinov.png

  • 4_stack_andromeda_horizontal_profile.PNG:
    4_stack_andromeda_horizontal_profile.PNG

  • andromeda_5min_cross_section.PNG:
    andromeda_5min_cross_section.PNG

  • andromeda_5min_cross_section_near_top.PNG:
    andromeda_5min_cross_section_near_top.PNG

  • andromeda_30s_cross_section_middle.PNG:
    andromeda_30s_cross_section_middle.PNG

  • andromeda_30s_cross_section_top.PNG:
    andromeda_30s_cross_section_top.PNG

  • andromeda_30s_exposure.png:
    andromeda_30s_exposure.png

  • andromeda_300s_exposure_exponential_scaling.png:
    andromeda_300s_exposure_exponential_scaling.png

  • bad_tracking_5_min_exposure.png:
    bad_tracking_5_min_exposure.png

  • bad_tracking_5_min_exposure_gaussinan_scaling.png:
    bad_tracking_5_min_exposure_gaussinan_scaling.png

  • The final stack of 4 images, each with 5mins exposure. Noticeably blurry, but the stacking does obviously improve the noise.

4_stack.jpg

  • An example of a 5 min exposure.
    andromeda-003.jpg
LogBookForm
Subject 20140213 LN Observation
Status blank
Topic attachments
I Attachment Action Size Date Who Comment
JPEGjpg 4_stack.jpg manage 140.3 K 14 Feb 2014 - 12:32 LaurieNevay  
Unknown file formatPNG 4_stack_andromeda_horizontal_profile.PNG manage 13.0 K 14 Feb 2014 - 12:30 LaurieNevay  
JPEGjpg andromeda-003.jpg manage 274.0 K 14 Feb 2014 - 12:32 LaurieNevay  
PNGpng andromeda_300s_exposure_exponential_scaling.png manage 2525.4 K 14 Feb 2014 - 12:30 LaurieNevay  
Unknown file formatPNG andromeda_30s_cross_section_middle.PNG manage 13.3 K 14 Feb 2014 - 12:30 LaurieNevay  
Unknown file formatPNG andromeda_30s_cross_section_top.PNG manage 15.8 K 14 Feb 2014 - 12:30 LaurieNevay  
PNGpng andromeda_30s_exposure.png manage 2842.2 K 14 Feb 2014 - 12:30 LaurieNevay  
Unknown file formatPNG andromeda_5min_cross_section.PNG manage 12.5 K 14 Feb 2014 - 12:30 LaurieNevay  
Unknown file formatPNG andromeda_5min_cross_section_near_top.PNG manage 14.5 K 14 Feb 2014 - 12:30 LaurieNevay  
PNGpng bad_tracking_5_min_exposure.png manage 2043.5 K 14 Feb 2014 - 12:30 LaurieNevay  
PNGpng bad_tracking_5_min_exposure_gaussinan_scaling.png manage 2701.6 K 14 Feb 2014 - 12:30 LaurieNevay  
PNGpng theta_aur_with_bhatinov.png manage 16.2 K 14 Feb 2014 - 12:28 LaurieNevay Theta Aur with Bhatinov mask

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Topic revision: r1 - 14 Feb 2014 - LaurieNevay

 
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