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CCD Images - Session 102 (2005-10-30)

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Objects Session Notes
Bullet Delta Cepheid - Variable Star
Bullet RR Lyrae - Variable Star
Bullet Mars
- 3 hour session, very dark skies, surprise  5 minute rain shower part way through session.
- Ambient temperature 13 degC 
- Aims of session were to record additional magnitude information on Delta Cepheid & baseline image sets for BL Lac. 
- Opportunity was taken to acquire an 1 hour long image sequence on RR Lyrae. 
- Focal Reducer was removed towards end of session and Mars was imaged through Barlow Lens/ ST7 camera. Seeing was poor
- More Notes

Delta Cepheid - Variable Star (Cepheid)

As part of an ongoing project examining the variability in Delta Cepheid, further image sets of the variable star  & the reference star SAO 34542 were recorded at around 19:46h UT and 21:42h UT (2005-10-30).  Image sets comprised  7 sequences of  3 x 0.2s V & 3 x 0.6s B (alternated between Delta Cepheid & reference star).  These were analyzed using the methodology described under 2005-10-05 Notes, and combined with previous estimates

B Band Magnitude estimates for Delta Cepheid 
(Reference Star SAO 34542)

Image
  
Magnitude and colour variation in Delta Cepheid based on observations 
on 7 observing sessions between 2005-10-02 and 2005-10-30.
Image 
Further observations will be made during future sessions 
in order to further refine the light curve

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RR Lyrae - Variable Star

An alternating sequence of  V Filter (10s exposure) and B Filter (20s exposure) images were recorded over a 1.1  hour interval.  Image capture was via automated scripts, An unexpected rain shower occurred part way through the period, causing loss of data from cloud cover and lightly coating the telescope.  

The dataset records fairly constant brightness of RR Lyrae over the 1.1 hour interval. The brightness was dimmer than expected based on previous sessions, raising the possibility that either the star's cycle differs from the 'standard' period length (0.56686776 days), the star has a longer length variability or that my magnitude estimates are in error.
[More on RR Lyrae Photometric Analysis]

Magnitude Data (B & V Filters)
Image
Goto RR Lyrae Photometric Analysis Notes
 
Image

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Mars

Mars  (near Opposition)
Annotated image on right

Image

Approximate Colour Image
(Red : 1s (R Filter), Green : 1s (V Filter), Blue : 1s (B Filter)
2005-10-30  22:21 h UT (#102295,301,324)

  

Mars 
Annotated image on right

Image Image
 CCD Image (rotated)
0.2s sec exposure, clear filter
Unsharp Masked
2005-10-30  22:28 h UT (#102373)
 
Image
  CCD Image (original), 
0.2s sec exposure, clear filter
Unsharp Masked
2005-10-30  22:28 h UT (#102373)
 
Image 
CCD Image , 
10 x 0.2s sec exposure , clear filter
(aligned & stacked using Registax)
2005-10-30  22:32 h UT (#102412-21)

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This Web Page: CCD Images - Session 102 (2005-10-30)
Last Updated : 2015-05-16
Site Owner : David Richards
Home Page : David's Astronomy Web Site