Greg Marshall


About Greg Marshall

I am a retired electronics engineer and after a few months of enjoying my leisure I began to miss doing product development. My astronomy hobby always needed new solutions to unique problems, so I decided that whenever I came up with a good solution I would try to make it available to others.


Skull & Crossbones

NGC2467 is an emission nebula in the constellation Puppis, and about 17,000 light-years from Earth.  It is often referred to as the “Skull & Crossbones Nebula”, and I think you can easily see skull shape, but the cross bones are not obvious to me.  The red extends to the upper left in something like a broad line, and the lower left is certainly extended, but is really just a blob.  With a lot of imagination I guess you could see these features extending to the upper right and lower right to form an X. This is from the remote observatory […]


And Here It Is…

This is the first ever photograph of a black hole.  Not what you expected?  Well, to a VERY small degree, that’s because I lied to you in my last post when I said that it would be the black hole at the center of our Milky Way galaxy, Sag A*.  This is actually the center of M87, a supermassive galaxy in the constellation Virgo.  Although it is about 53 million light-years away, it is apparently large enough that it made a better target than Sag A*.  But the EHT team reports that an image of Sag A* is coming soon. […]


First Photo of a Black Hole (sort of)

I’ve been asked many times whether I have ever photographed a black hole, and my answer has always been that it’s not possible to photograph a black hole.  That’s technically correct, since no light (or other electromagnetic energy) can escape a black hole.  However, it is theoretically possible to capture an image of the “event horizon” around a black hole, and very soon we will all be able to witness the results of that theory put into practice. The above image is a computer simulation of such an event horizon, generated back in 1978 by a fellow with the ironic […]


Drop Dead Gorgeous

I hope it doesn’t sound too boastful for me to say it, and to some degree it is a matter of personal taste, but I think this is just gorgeous, and the best astrophoto I’ve produced to date.  It is, of course, from the remote observatory in Australia, and is not visible from up here in the north.  Eta Carina is quite bright, and large – about 4 times the size of the Orion Nebula.  It’s a mixture of emission, reflection, and dark nebulosity, as the best ones often seem to be. For this type of target I would typically […]


The Vela Supernova Remnant

A couple of months ago I posted just the H-alpha channel of this image from the remote observatory in Australia.  The addition of O-III and S-II data makes a dramatic difference – well worth the wait! This is actually just a small portion of the Vela SNR, one of the largest and brightest SNRs in our night sky, just 1.5 degrees wide out of the full width of 8 degrees.  The supernova that produced this magnificent nebula happened about 11,000 to 12,000 years ago and was just 800 light-years from Earth in the constellation Vela. The total exposure time for […]


M78 From the Other Side

As mentioned earlier, I have been waiting (not so patiently) for better weather in Australia to finish collecting image data from M78, a bright reflection nebula in Orion.  It has finally happened, although there were issues with the quality of some frames.  I haven’t yet been able to figure out what caused the problem, but did find a reasonable work-around for it. This was captured from the other side of Earth, but also makes me curious about what M78 would look like from its other side.  In the upper right it appears that there is more bright blue light behind […]


Canyon & Dipper, Part 2

In an earlier post I shared a picture taken at the top of a canyon wall, showing the canyon below and the the Big Dipper above (through some interesting clouds).  When I went down into the canyon (not actually the same one) I thought I’d try the same thing from this different perspective.  It would have been great to shoot this looking up the canyon wall, just as the previous shot was looking down such a wall, but since the Big Dipper was pretty low in the northern sky, that was not going to work.  Indeed, I had to walk […]


New Focus

I have some big news for you – and a big opportunity!  From the beginning, the business side of Wa-chur-ed Observatory has been split into 2 distinct parts; selling my astrophotos, and selling tools for astronomy (especially the PerfectStar family of focus controllers and motors).  As the business grew it became increasingly clear that the “tools” side was more profitable and less of a headache.  And now that I have a significant commitment in business-to-business sales, I find that continuing the “art” side is a distraction that detracts from the more important part of the business.  And so, although it […]


Cometary Globule (or Tanuki)

CG 4 is one of a small number of objects classified as “Cometary Globules” because they have a round(ish) head and a tail – like a comet.  We don’t have a good understanding of how these objects formed, but it cannot be a coincidence that most (or possibly all) of them are in the vicinity of the Vela supernova remnant, and their tails point back toward it.  CG 4 is in the constellation Puppis, and is about 1,300 light-years from Earth.  It is sometimes called “The Hand of God”. My daughter says it looks like a tanuki – Japanese for […]


M78 and a piece of Barnard

Messier 78 is another target that I’ve wanted to shoot for years, but is only visible in the Winter.  I’m currently collecting data on this target (very slowly) from the remote observatory in Australia, and I hadn’t planned to shoot it during this trip to California because it’s a rather small object for the wide-field telescope I brought here.  But I decided to try it anyway, hoping there would be some interesting stuff in the background.  Well, there sure is!  The red band on the left and upper left corner is a small portion of Barnard’s Loop, a huge semi-circle […]