August 15, 2012

vdb152 or Ced 201, in Cepheus (19 July 2012)

Cederblad 201 or van den Bergh 152 (the nebula is listed in at least these catalogs) consists mostly of a long, wide trail of gas and dust, but the end of it is bathed in the reflected starlight of the bright, blue star passing by.   Imaging this nebula was one reason to go to the Three Rivers Foundation site.  This kind of dim starlight reflection and the dusty red-brown gas behind it can only be captured well and quickly from a very dark site.

This image is only 5x20'.  It was taken very early in the morning on the 20th of July.  I thought I was going to get some more time the next night, but clouds moved in.  So I was able to get no more luminance and took no color data.  Fortunately, there are many images of vdb152 around the web.  The color data you see above was donated generously by Bob Fera.  The Feras' lovely image, which I think has the best color balance of any for this object, can be found here (just scroll down through the great images till you find it).  Through the magic of Registar and Photoshop, I can superimpose just the color from the Feras' image over my own grayscale image.  Thanks to the Feras.

Here is my data in grayscale:

The optics on the 6" have gone slightly out of alignment.  It is time to take the scope apart and put it back together squarely.

Telescope: Orion 6" f/5 Imaging Newtonian and Astro-Tech Coma Corrector (eff. at f/5.5)
Camera and Exposure: SXVF-H9 (5x1200'), Alnitak Flat-man flats
Filter: Astronomik Lum
Guiding: SX Lodestar and SX OAG
Mount: Takahashi NJP
Software: Nebulosity, Maxim DL, Registar, Photoshop CS3
Location: 3RF's Comanche Springs Astronomy Campus, Crowell, TX

2 comments:

RoryG said...

That's a beautiful image! What an interesting object! That's a very interesting structure around the star at the end of the cloud.

Polaris B said...

Thanks, Rory! Yes, and I know nothing about it. The star is close to the nebula. Apparently its motion in space indicates it did not form out of the cloud. Perhaps those arcs are bow shocks as the star moves through. I have read that the blue light is just reflection from the star.