Instrument

12.5" RCOS @  ~f/9 (2880 mm fl) 0.64 arcsec / pixel.  The Zoomify image scale is 1.28 to 3.33 arcsec / pixel.

Mount

Paramount ME

Camera

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

Acquisition Data

11/22/2011 to 2/21/2012 Chino Valley, AZ... with CCDAutoPilot3 & CCDSoft.  AOL guided

Exposure

Ha  690 min (23 x 30 min, bin 1x1)

Click here for the RGB color image.

Click here for a narrow band color mapped image.

Software

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

• PixFix32 (pre-beta) to repair column defects.

• CCDStack to calibrate, register, normalize, data reject,  combining the sub exposures.

• PhotoShop for non-linear stretching. 

• Noiseware Pro, a PhotoShop plug-in.

North is to the top.

The Cone Nebula, located about 2700 light years away, was discovered by William Herschel on December 26, 1785. Features in the image include red emission from diffuse interstellar hydrogen and wispy filaments of dark dust. The dark Cone Nebula region clearly contains much dust which blocks light from the emission nebula and open cluster NGC 2264 behind it. One hypothesis holds that the Cone Nebula is formed by wind particles from an energetic source blowing past the Bok Globule at the head of the cone.
Source: NASA APOD

This image, captured with a hydrogen-alpha filter, shows the extent of the hydrogen gas.