NGC7822
| H alpha image, 13 x 5 min, ST10XME, TAK 106, external guiding Borg 77ED, SBIG remote guider |
This image shows the brightest part of NGC7822, a large molecular cloud in the northern
constellation Cepheus. The actual nebula is much larger as shown in this image from the web
(http://www.astrosurf.com/astroduvel/images/ngc7822_v2.jpg). This nebula is thought to be about
3000 light years away. It was the subject of the Astonomy Picture of the Day in August 2009
(http://apod.nasa.gov/apod/ap090828.html). The APOD image is a much closer view of the core of
the nebula and shows pillars of gas, dust, and young, hot stars. Some of those pillars can be seen in
the image below.
The grayscale image was created using a hydrogen-alpha filter. This band of light makes up most of
the light coming from this nebula, at least in the visible wavelengths. I tried to do a narrow band color
image of this nebula by adding OIII and SII filtered images. However, those images were too dim and
the resulting composite image was nothing to write home about. The star spikes were added. Click
on each image for the full sized version.
constellation Cepheus. The actual nebula is much larger as shown in this image from the web
(http://www.astrosurf.com/astroduvel/images/ngc7822_v2.jpg). This nebula is thought to be about
3000 light years away. It was the subject of the Astonomy Picture of the Day in August 2009
(http://apod.nasa.gov/apod/ap090828.html). The APOD image is a much closer view of the core of
the nebula and shows pillars of gas, dust, and young, hot stars. Some of those pillars can be seen in
the image below.
The grayscale image was created using a hydrogen-alpha filter. This band of light makes up most of
the light coming from this nebula, at least in the visible wavelengths. I tried to do a narrow band color
image of this nebula by adding OIII and SII filtered images. However, those images were too dim and
the resulting composite image was nothing to write home about. The star spikes were added. Click
on each image for the full sized version.
| This wide field image of NGC7822 was taken with a modified Canon XSi and an 85mm lens (20 x 3 min, f/4, AstroTrac mount). Click on either image for the full size. |
