Antilhue - Chile

NGC 3115 - The Spindle Galaxy
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Image Data

Designation NGC 3115,  Bennett 42,  Caldwell 53,  the Spindle Galaxy
Object type Type  S(0)  lenticular galaxy
Coordinates 10 h 05 min     - 07° 43'  Sextans (Sex)
Description NGC 3115 is also known as the "Spindle Galaxy."  It is a lenticular, a "spiral galaxy without spiral structure", i.e. a smooth disk galaxy, where stellar formation has stopped because the interstellar matter was used up.  From their appearance and stellar contents, they can often hardly be distinguished from ellipticals observationally.  Dreyer calls this lenticular galaxy very bright (mag 9.7),  large  (8.3'x3.2'),  very much elongated  (P.A. 46°), and brightening sharply to a brightened, elongated nucleus.  It lies 4.8° north of Lambda Hydrae.

North is to the right in the 15 x 10 arcmin field of view.  

Exposure LRGB 60:20:20:20 min @ -15°C,  all exposures unbinned
Camera SBIG ST-10XE selfguided + CFW8 with Astrodon LRGB filterset
Optics RCOS 14.5" Ritchey-Chrétien @ f/9 (prime focus)
Mount Astro-Physics AP1200GTO
Software MaxIm DL/CCD, Adobe Photoshop CS
Location - Date - Time San Esteban (Chile) - 10Apr05 @ 00:30 UTC 
Conditions Transparency 7,  Seeing 5, Temperature  +10°C