Focal Pointe Observatory
Astrophotography by Bob Franke

Recent Images
   Natural Color
   Narrow Band
Solar System
Tips & Tricks
Published Images
My Freeware
Local Weather


Send Email







NGC 3628

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

Click here to view the image without Zoomify (2250 x 1500 - 757 KB)





12.5" RCOS @  ~f/9 (2880 mm fl) 0.643 arcsec / pixel.  Shown resampled to 2.57 arcsec / pixel.


Paramount ME


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

Acquisition Data

4/20/2009 to 4/27/2009  Chino Valley, AZ


Lum    375 min (25 x 15 min, bin 1x1)

RGB    315 min ( 7 x 15 min each, bin 1x1)


CCDSoft, CCDStack, Photoshop CS w/ the Fits Liberator plugin, Noel Carboni's actions and Russ Croman's Gradient Exterminator

CCDStack to register, normalize, data reject, combine and luminance sharpen.

PhotoShop for the color combine.


North is to the top.

At a distance of 30 million light years, NGC 3628 is a relatively close galaxy in the constellation Leo. NGC 3628, along with nearby M65 and M66 form the Leo Triplet galaxy group.

To the left, extending out of the frame, about one fourth of the galaxy's tidal tail is faintly visible. The tail extends for about 300,000 light years and is caused by interactions with the two large nearby galaxies. The tail is composed of young blue star clusters and star forming.

The second image shows the position of asteroid 35856 1999 JG64 on two successive nights. It first shows up in the blue exposures and then the next night in the red. It is not shown as neat blue and red straight lines because the CCDStack data rejection routines removed some of the data. More aggressive use of these routines would have completely removed the asteroid.