C/201 P1 Garradd  Magnitude ~ 7.2

Cooled CCD camera vs. DSLR
 

 

 

 
 

2  minutes binned 2x2
 

   Screen shot at same scale as image at left  from SkyMap Pro 10  http://www.skymap.com/ .
 		  

                    The cooled CCD Camera was binned 2x2, giving it a 4X sensitivity advantage, and  was on an f/3.3 astrograph, so brightness was (5.5/3.3)2  x 22 = 10.8 times as bright, a definite advantage

  Scope:  Takahashi Epsilon E-160 f/3.3 astrograph    
  Camera: Starlight Xpress SXVR-H9 -- cooled CCD    
  Image:  2  minutes binned 2x2;    image scale 5 arc/seconds per pixel;  Processing :  ImagesPlus for most processing operations;  MaximDl for annotation; AA 5.0 for Isophotes
  Filters: None
  Conditions: NELM ~ magnitude 3.0    17.8 mag/(sq arc sec) per Sky Quality Meter  -- vey bright half moon 43 degrees away    
  Mount:  AP1200GTO    
 

Comments:

 Unfavorable conditions with bright moon but interesting to see how the two different cameras performed

 

 

False Color  

Isophotes

Negative

These images are zoomed 2X

 

 

 

 

 
 

Single 400 second  exposure ISO 800
 

  

Screen shot at same scale as image at left  from SkyMap Pro 10  http://www.skymap.com/ .
 

  

 

                       The DSLR camera was on an f/5.4 refractor, so brightness was  only (3.3/5.6)2  x 1/4 (no on-chip binning) = 0.09 times as bright, a  big disadvantage. Yet the DSLR image was quite pleasing.

  Scope:  Teleview NP-101  4" f/5.6    
  Camera: Canon T1i, ISO 1600  unmodded    
  Image:  Single 400 second  exposure ISO 800;    image scale 12 arc/seconds per pixel  Processing   ImagesPlus for most processing operations;  MaximDl for annotation; AA 5.0 for Isophotes
  Filters: None
  Conditions: NELM ~ magnitude 3.0;   17.8 mag/(sq arc sec) per Sky Quality Meter  -- vey bright half moon 43 degrees away    
  Mount:  AP1200GTO    
 

Comments:

 Relative motion of comet was 1.0 arc seconds/minute, but moon light limited exposure time

 

 

 

 

 
 

Orbital parameters courtesy of  http://neo.jpl.nasa.gov/orbits/ 

  

Light Curve courtesy of Seiichi Yoshida.      http://www.aerith.net/comet/catalog/0103P/2010.html

  



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