March 26, 2017
This globular cluster is about 52,000 light years away and appears in the constellation Bootes. As globs go, this one is sparse.
A galaxy on the lower left (northwest) of the image is PGC 1840894, magnitude 17.70. The larger galaxy at lower right is PGC 1835025, magnitude 17.37.
The most interesting thing (I thought) about this globular is that a galaxy glows through it. At the lower right of the cluster, one glowing object is a smudge instead of a star. It is about 25% of the way from the center of the cluster to PGC 1835025. It is very faint. I have no idea if it has a name. A Hubble shot of NGC 5466 (lower left in that version) shows that this smudge is actually a spiral galaxy in the far distant background. Interestingly, the Hubble image also shows several other galaxies shining through that are not visible in my data. You can see them if you zoom in and pan around.
This is 8x480" with the SXVF-H9 through the CFF Classical Cassegrain at f/7.93.
This galaxy is between 40 and 60 million light years distant and appears in the constellation Ursa Major. It has an unusual shape (one arm seems to be pointing the wrong way) and so is listed in the Arp catalog as well (#018). It is probably a member of the same group as M109. This is 9x900" with the SXVF-H9 through the CFF 290 Classical Cassegrain at f/7.93. The galaxy to the lower right (southwest, actually) is PGC 38369. North is left in this image.
February 17, 2017
February 7, 2017
The data for this image was gathered through Astronomik 6nm-wide narrowband filters focused on the emission lines of Hydrogen alpha (H-α) and OIII. The H-α filter may also pick up some NII emission at 658.4 nm. Two hours of data (8x900") were collected through each filter. The two data sets were combined with a synthetic green channel to create an RGB. The color of the image matches closely the cyan of the OIII emission, which predominates the data, but the image preserves also the H-α [+NII] emission, and particularly the jets coming from the central star. I have included the separate monochrome data from the two sets below. The nebula's central star is about magnitude 14.8.
This image was taken through the CFF 290 Classical Cassegrain at f/7.93, with the SXVF-H9 camera.
Here is a link to a Hubble image of the nebula.
Here is the OIII:
And here is an inverted and stretched OIII version showing the looping of the jets back around to form the taffy wrapper pulls, or, at least, that's what it looks like to me. An interesting paper discussing the nebula's structure is here: https://arxiv.org/ftp/arxiv/papers/1206/1206.1902.pdf.
January 28, 2017
January 16, 2017
I am just getting around to processing this 8 hours of luminance data from DSW in New Mexico. As you can see, the skies there are great and equipment superb. The telescope is a Tak FSQ 106. The 8300-chip camera leaves slight blooms on stars that mimic diffraction spikes, an aesthetically pleasing failure of the camera's anti-blooming gate.
This is a great part of the sky, and this image allows one to fall into it several hundred million light years. The big galaxies are about 35 million light years away (give or take 10 million). The smallest galaxies are hundreds of millions of light years distant. See if you can spot clumps of those little dust motes in the distant background.
January 3, 2017
November 1, 2016
October 25, 2016
This image is just 12x600" through the CFF290 Classical Cassegrain at f/7.93, with the SXVF-H9 camera.