Sunquest - Imaging the Night Sky

This is my quest: to follow that star ...

Last update: 12/25/08

The stars: distant suns. This site reflects the culmination of my personal quest to become an astroimager - an amateur astronomer whose avocation is to capture images of the celestial wonders that pass over our heads, largely unnoticed, every day. Thus, this is the triumph of my quest to photograph the distant suns of our Universe - a sun quest.

This journey began with the construction of an observatory in the New Mexico desert, far away from the lights of major towns and huge cities. This resulted in the Bunker Ranch Observatory. There you'll find pictures, descriptions, and accounts of the process of building the observatory, and information on the equipment used to take the images herein.


Your monitor should be adjusted in contrast and brightness so that all 21 grayscale levels below are discernable. You may have to lower the room lights to succeed at this. (Hint: use the "brightness" control to change the levels of black, and the "contrast" control to change the levels of white.)

Greyscale


Night Gallery (Picture, if you will, a dark sky ...)

Click on the thumbinail images below to bring up a full-sized image.

M13

We begin with the first astrophoto taken with the BRO's major instrument, a 400mm (16") Hypergraph. This is M13, the famous globular cluster in Hercules, in a 30-minute exposure with a Pentax 67 camera loaded with Ilford 3200 film. Note the well-known "X" across the center of the cluster.

Globular clusters (so-named for their roughly spherical shape) are very old; they were, in fact, the first large structures to form at the birth of the Milky Way Galaxy about ten billion years ago. There are about 60 of these clusters in a roughly spheroidal pattern co-centered with the galactic disk.

An average globular contains perhaps 100,000 stars; M13 is rather larger than that, containing several hundred thousand. One estimate even places the number of stars at over a million.


Below is the first color image taken with the observatory's STL-11000XM CCD camera. This is an LRGB composite of 5-minute images of the Flame and Horsehead Nebulas in Orion. The camera was attached to a Borg 125ED operating at f/4 for a focal length of 500mm.

Flame and Horsehead

The glowing clouds here shine by fluorescence from the ultraviolet light emitted by the hot blue stars in the area. The "Horsehead" visible against the red cloud is a dark dust nebula that is absorbing the red light from the cloud.


Here is another color image of the same area, taken with the same camera but a different telescope. The telescope used for this image is a Takahashi BRC-250, which is twice the diameter of the Borg 125ED (so it gathers 4 times as much light), but also 3 times the focal length (so the "magnification" is 3 times higher). You'll note that there is more visible detail here; you'll also note that my image-processing skills have improved somewhat over the previous image ...

Flame and Horsehead

The Bunker Ranch Observatory's blog has an article on how this image was made.

The yellowish and reddish clouds in this image are huge clouds of hydrogen gas inside the Milky Way Galaxy. The colors are different due to differing overall chemical composition, with the red being more pure hydrogen. These are, of course, far thinner than the water-vapor clouds in Earth's atmosphere that you're used to seeing; the hydrogen clouds contain only a few dozen atoms in the volume of an average-sided room.


Comet Holmes

This is an image of Comet Holmes -- a small comet out by the orbit of Jupiter that came to fame with a sudden outburst of gasses that increased its brightness by more than a million times, and made it an easy naked-eye sight in late 2007. This is a short exposure designed to capture details of the comet's nucleus, within the faintly visible halo that was still easily visible as it grew larger than the Sun.

This image was taken with a Borg 125ED configured at 500mm f/4, with an SBIG STL-11000M CCD camera.


North America Nebula

Again taken with the Borg 125ED and the STL CCD camera, here is a short (one-minute) exposure of the North America Nebula (NGC7000), demonstrating that a CCD camera can capture images with far shorter exposure times than film (with some help from a bit of digital image processing).


The Pleiades

This is another one-minute image from the Borg 125ED and STL CCD camera - the Pleiades (M45). This is a fairly young association of stars that were al born together out of the same gas cloud. The haze (blue in color images) around the stars is a dust cloud that the stars are passing through, unrelated to the gas cloud where the stars were born.


M33

Everything came together one night in November of 2008 -- the sky wasn't the blackest, and the seeing wasn't the steadiest, but the equipment all decided to give me a break and work to perfection for one shining moment. The result was this image of M33, a nearby spiral galaxy.

This is a composite of five 15-minute exposures taken with the 400mm (16") scope, with some minimal image enhancement to bring out some of the fainter detail. The full-size image is large, but, I think, worth a look.


Rosette Nebula

And now for some more color - this is the Borg 125ED and STL CCD camera again; but here we combine four 20-minute images (one each in white, red, green, and blue light), to get a shot of the Rosette Nebula (the nebula is designated NGC 2237; the open cluster of stars inside the nebula is NGC 2244). Note that this image is only 1/4 the size of the original in width and height; that means the original image has 16 times more data than seen here! (Well, actually, it's worse than that, because the original is 16 bits per pixel while this is only 8 bits per pixel. So the original really has 4,096 times the data of this image - 4 times the resolution both horizontally and vertically, and 256 times the color information.)