Focal Pointe Observatory
Astrophotography by Bob Franke

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NGC 891


           Click the full screen zoom button       ^
     
Click the image to Zoom and Pan    

Zoom in, pan to the far left and below center to see what appears to be a non-cataloged LSB (low surface brightness) dwarf galaxy, that may be associated with NGC 891. These little guys are everywhere, but difficult to get pro observatory telescope time allocated for their study. They are interesting, in that they seem to contain very significant amounts of dark matter. This object can also be found in the SDSS-II images.

Click here to view the image without Zoomify (1950 x 1300)

 

Instrument

12.5" RCOS @  ~f/9 (2880 mm fl) 0.643 arcsec / pixel.  Zoomify image scale is 0.86 to 3.44 arcsec / pixel.

Mount

Paramount ME

Camera

SBIG STL-11000 w/ internal filter wheel, AstroDon Filters

Acquisition Data

10/24/2009 to 11/22/2009 Chino Valley, AZ... with CCDAutoPilot3 & CCDSoft.

Exposure

Lum    300 min (10 x 30 min, bin 1x1)

RGB    270 min (  3 x 30 min each, bin 2x2)

Software

  • CCDSoft, CCDStack, Photoshop CS w/ the Fits Liberator plugin. Noel Carboni's actions and Russell Croman's GradientXTerminator.

  • Noel Carboni's StarSpikes Pro was used to restore and sharpen the normal spider defraction spikes.

  • eXcalibrator for (b-v) color calibration, using 15 stars from the NOMAD1 database.

  • PixFix32 (pre-beta) to repair hot/cold pixels and column defects.

  • CCDStack to calibrate, register, normalize, data reject, combine the sub exposures & LRGB color.

  • PhotoShop for LLRGB combine &  on-linear stretching.

Comment

North is to the left.

Discovered on October 6, 1784 by William Herschel, NGC 891 is about 30 million light-years way in the constellation Andromeda. From our perspective the unbarred spiral galaxy presents a beautiful edge on view.
 

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Click the image for fullsize wide field view

Instrument

Celestron C11 @  ~f/10.5 (~2930 mm fl) 1.27 arcsec / pixel.  Shown resampled to 1.58 arcsec / pixel.  Click the image for a full size wide field view.

Mount

Paramount ME

Camera

SBIG STL-11000 w/ internal filter wheel, AstroDon Filters

Acquisition Date

10/14/07 to 10/18/07  Chino Valley... with CCDAutoPilot3

Exposure

Lum    240 min.  (48 x 5 bin 2x2)
RGB    120 min.  (24 x 5 bin 3x3) each

Software

CCDSoft, Sigma-Clip, Photoshop CS w/ the Fits Liberator plugin, Paint Shop Pro,and Noel Carboni's actions

Comment

North is to the top

Discovered by William Herschel in 1784.  NGC 891 is at a distance of 30 Million Light Years.

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Instrument

Celestron C11 @  F/7.2 (2000 mm fl) 0.93 arcsec / pixel

Mount

Losmandy G11

Camera

SBIG ST-7 with CFW-8A color wheel

Acquisition Date

3/19/04 to 4/2/04  Near downtown Seattle

Exposure

Lum    555 min.  (37 x 15)
Red    120 min   (8 x 15 bin 2x2)
Green 105 min.  (7 x 15 bin 2x2)
Blue    150 min.  (10 x 15 bin 2x2)

Software

CCDSoft, Sigma-Clip, Photoshop CS w/ the Fits Liberator plugin & Iris