Difference: LogBookAstronomyEntry0033 ( vs. 1)

Revision 114 Feb 2014 - LaurieNevay

Line: 1 to 1
META TOPICPARENT name="LogBookAstronomy"

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

Please DO NOT alter or remove the line below this line. 
  • Set EDITMETHOD = wysiwyg
Please DO NOT alter or remove the line above this line. -->

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:

  • 4_stack_andromeda_horizontal_profile.PNG:

  • andromeda_5min_cross_section.PNG:

  • andromeda_5min_cross_section_near_top.PNG:

  • andromeda_30s_cross_section_middle.PNG:

  • andromeda_30s_cross_section_top.PNG:

  • andromeda_30s_exposure.png:

  • andromeda_300s_exposure_exponential_scaling.png:

  • bad_tracking_5_min_exposure.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.


  • An example of a 5 min exposure.

META FORM name="%25SYSTEMWEB%25.LogBookForm"
FORM FIELD Subject Subject 20140213 LN Observation
FORM FIELD Status Status blank
FORM FIELD Author Author TWikiGuest
META FILEATTACHMENT attachment="theta_aur_with_bhatinov.png" attr="" comment="Theta Aur with Bhatinov mask" date="1392380934" name="theta_aur_with_bhatinov.png" path="theta_aur_with_bhatinov.png" size="16604" user="uxap005" version="1"
META FILEATTACHMENT attachment="4_stack_andromeda_horizontal_profile.PNG" attr="" comment="" date="1392381006" name="4_stack_andromeda_horizontal_profile.PNG" path="4_stack_andromeda_horizontal_profile.PNG" size="13305" user="uxap005" version="1"
META FILEATTACHMENT attachment="andromeda_5min_cross_section.PNG" attr="" comment="" date="1392381006" name="andromeda_5min_cross_section.PNG" path="andromeda_5min_cross_section.PNG" size="12790" user="uxap005" version="1"
META FILEATTACHMENT attachment="andromeda_5min_cross_section_near_top.PNG" attr="" comment="" date="1392381006" name="andromeda_5min_cross_section_near_top.PNG" path="andromeda_5min_cross_section_near_top.PNG" size="14845" user="uxap005" version="1"
META FILEATTACHMENT attachment="andromeda_30s_cross_section_middle.PNG" attr="" comment="" date="1392381006" name="andromeda_30s_cross_section_middle.PNG" path="andromeda_30s_cross_section_middle.PNG" size="13646" user="uxap005" version="1"
META FILEATTACHMENT attachment="andromeda_30s_cross_section_top.PNG" attr="" comment="" date="1392381006" name="andromeda_30s_cross_section_top.PNG" path="andromeda_30s_cross_section_top.PNG" size="16159" user="uxap005" version="1"
META FILEATTACHMENT attachment="andromeda_30s_exposure.png" attr="" comment="" date="1392381006" name="andromeda_30s_exposure.png" path="andromeda_30s_exposure.png" size="2910418" user="uxap005" version="1"
META FILEATTACHMENT attachment="andromeda_300s_exposure_exponential_scaling.png" attr="" comment="" date="1392381006" name="andromeda_300s_exposure_exponential_scaling.png" path="andromeda_300s_exposure_exponential_scaling.png" size="2586009" user="uxap005" version="1"
META FILEATTACHMENT attachment="bad_tracking_5_min_exposure.png" attr="" comment="" date="1392381005" name="bad_tracking_5_min_exposure.png" path="bad_tracking_5_min_exposure.png" size="2092586" user="uxap005" version="1"
META FILEATTACHMENT attachment="bad_tracking_5_min_exposure_gaussinan_scaling.png" attr="" comment="" date="1392381005" name="bad_tracking_5_min_exposure_gaussinan_scaling.png" path="bad_tracking_5_min_exposure_gaussinan_scaling.png" size="2766457" user="uxap005" version="1"
META FILEATTACHMENT attachment="4_stack.jpg" attr="" comment="" date="1392381170" name="4_stack.jpg" path="4_stack.jpg" size="143709" user="uxap005" version="1"
META FILEATTACHMENT attachment="andromeda-003.jpg" attr="" comment="" date="1392381170" name="andromeda-003.jpg" path="andromeda-003.jpg" size="280574" user="uxap005" version="1"
This site is powered by the TWiki collaboration platform Powered by PerlCopyright © 2008-2022 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding RHUL Physics Department TWiki? Send feedback