Category: Deep Sky

I’ve been working on the “Squid Nebula” (aka OU4) in Cepheus. It is the smaller elongated blue object above and lies in front of the much brighter “Flying Bat Nebula” (aka SH2-129). The flying bat looks a lot more like a bell than a bat to me but the squid looks like a squid. The Flying Bat Nebula is a Hydrogen Alpha (Ha) emission nebula, glowing reddish from energized hydrogen. The Squid Nebula is an Oxygen III (Oiii) emission nebula energized by a triple star system at it’s core.

The Squid is so faint it was only discovered in 2011. I’ve read in several places you need to have at least 20 hours of exposure to do it justice. After 4 hours taken in June, I felt confident I could see something there. After 4 more taken in August, for a total of 8 hours so far, I have enough for it to start taking shape. That is what you see above.

The image above is just a screen snippet of 8 hours of exposure with a Samyang 135mm lens, Optolong L-Extreme F2 filter (which lets through only Ha and Oiii), and ZWO ASI2600MC Pro camera. I extracted the blue channel, processing is separately and then combined it back with the other two channels.

This object will be in the evening sky for a few months, which is good as it has been cloudy a lot. This is undoubtedly the dimmest object I’ve attempted taking the crown from the Spaghetti Nebula (https://jamesdixon.us/12-20-2024-the-spaghetti-nebula/) I shot last winter and plan to shoot again this winter.

Near the bright red star Antares is a large complex of interstellar clouds. Some are emission, some are reflection, and some are dark clouds. This is probably the best image I’ve ever gotten of it although I have seen many that were far better.

In the pentagram near the center are Antares at the bottom of the pentagram and the globular cluster M4 above and to the right of it. The other three points of the pentagram haven’t earned a name yet. They probably have, I just don’t know what they are. The star just above and to the left of the pentagram is Rho Ophiuchus itself. Just barely in the constellation of Ophiuchus while the pentagram is in Scorpius.

This was shot with my Samyang 135mm F/2 lens and ASI2600MC Pro with an Antlia Triband RGB Ultra filter for a total of two hours from the River Ridge Observatory.

In the upper right are the Lagoon Nebula and Trifid Nebula while the rest of the image is dominated by the Milky Way, mostly in the constellation of Sagittarius.

The Lagoon is a bright star forming nebula, visible to the unaided eye, and second only to the Orion Nebula in the winter sky. Above and to the right is the Trifid Nebula, which deserves it’s own closeup. The Trifid contains emission, reflection, and dark nebulae all in one tidy package. Throughout the image but especially in the Milky Way, you can see dark nebulae everywhere. These are simply cold clouds of gas and dusk that are too cold to emit light and not near anything to let them reflect light.

This was shot with my Samyang 135mm F/2 lens and ASI2600MC Pro with an Antlia Triband RGB Ultra filter for a total of two hours from the River Ridge Observatory.