The Cone Nebula

"Burnham's Celestial Handbook" indicates that NGC 2264 is about 2600 light years away. It further indicates that the blue nebulosity at the top of the photograph is a "nebulous condensation" illuminated by a star within. I have used MegaStar and Burnham's diagram on page 1210 to try to identify the particular star responsible for the illumination and I believe it is SAO 114246 (Magnitude 7.2.) The Hubble Guide Star Catalog designation given by MegaStar is 750:1535 and the object is classified as a "NONSTAR". There are two "NONSTAR" stars where Burnham shows only one star labeled "7" in his diagram. It seems peculiar that a "NONSTAR" object is providing the illumination of the gas cloud since I had been under the impression that "NONSTARS" were primarly quasars or similarly more exotic objects not necessarily in our galaxy.

There is also part of a blue circle at the top of the image that is a telescope artifact centered on the bright star SAO 114258 (Magnitude 4.7 according to MegaStar) which is just outside the photograph's field.

The cone nebula is a dark nebular region that is, according to Burnham, "wonderfully outlined against glowing nebulosity." It is just below the center of the photograph and appears as a dark cone outlined in red. More contrast would have been nice so if I photograph it again, I should plan on a 4 or 5 hour shot obviously. This is perhaps the most difficult "well-known" object that I have attempted to photograph. There is a wonderful black and white Palomar 200 inch telescope photo of the Cone Nebula on page 1211 of Burnham's book.

To photograph the Cone Nebula, I aligned my telescope, entered the coordinates (06 41 06, +09 23 00), located a guide star for the Pictor 201XT autoguider, opened the shutter and hoped for the best. The cone nebula is not visible to the eye in a 10 inch telescope but it does show up on film. The fact that it is centered relatively well in the photograph is a tribute to the precision inherent in the Meade LX-200 10" telescope system.

In the image below, which is taken from a MegaStar display (and not replicated well at all using JPEG encoding by the way - JPEG seems to change the "red pixels" to "almost red pixels", i.e., 254 instead of 255 thereby leaving irritating little dots on the image which I have been unable to eliminate...), I have labeled NGC 2264 and have roughly outlined the region that my photograph covers.