JS9 is a FITS file editor that’s both built into Slooh.com and is available as a standalone application that runs on your browser, so you don’t have to install anything on your computer to...
Category: Blog
Pair of Visual Multiple Star Systems
This is a pair of visual multiple star systems: When you look up and see the stars, in most cases, you’re actually looking at multiple star systems. In many cases, the stars that make...
Orion and Running Man Nebulae in Narrowband
This is the Orion Nebula and Running Man nebula: I imaged these nebulae in narrowband and they’re presented here using the Hubble Palette (SHO). The large blue nebula is the Orion Nebula, or Messier...
Waxing Crescent Moon
This is the waxing crescent moon as it appeared on September 9, 2021. Many of the features you see on the moon are impact craters – there are about 9,000 of them. The darker...
Sun: Huge Active Regions
This is the lower half of the sun as it appeared on September 7, 2021: The sunspots shown here are the biggest we have seen in many years. They are AR 2866 on the...
Convert Angular Size to Linear Size
The dimensions for most astronomical objects are given in degrees of arc in most cases. While the apparent size of an object is interesting, it’s sometimes useful to convert the apparent size into something...
Messier 57 – Ring Nebula – in LRGB and Narrowband
While most of my images are in broadband/LRGB, I also image in narrowband. I decided to take another look at Messier 57 both in broadband/LRGB and narrowband to see what the result might be....
Sun: July 22 2021 – 6 Active Regions
This is the sun as it appeared on July 22, 2021: The surface features six active regions – we haven’t seen that many active regions at once in a very long time. Here’s an...
Sun: AR2837
This is the sun on June 29, 2021 featuring sunspot AR2037: The sunspot developed today, is unipolar, and is made up of just one active region. This sunspot joins two others on the lower...
Eagle and Omega Nebulae
This is a widefield, narrowband view of the Eagle Nebula (upper orange and blue nebula), or M16, and the Omega Nebula, lower blue nebula, or M17: The Eagle Nebula is about 5,700 light years...
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