This fall and winter was dedicated to imaging the Cepheus area with a Hydrogen Alpha narrow band filter. However, at the low latitude from where I observe, Cepheus gets low on the horizon pretty early in winter. So I had to find another target to image during the late night. I decided to revisit anContinue reading “Visiting the Horse Head nebula in Narrowband”
Damselfiles (demoiselles) are smaller than dragonflies, and when at rest, they fold their wings over their bodies, unlike dragonflies who spread them open and flat. I found a few of them while visiting a creek in East Texas and took some time to do some Macro pictures.
Wild life in the city is amazing. Yesterday a Tiger Swallow Tail butterfly graced us with its presence for a few minutes, in the middle of Houston. I took the opportunity to play with the Sony 70-200 f/2.8 and Sony A7RIII and improvised, a few pictures in my front yard, all hand held. In macro,Continue reading “Tiger Swallow tail”
When close to both their perhelion and to Earth, comets can have a fast motion relative to the background sky. This is also the time when they are the brightest. If using very fast optics (the C11 + hyperstar, at f/2 for 280mm of aperture is well suited), it is possible make a video ofContinue reading “Objects moving in the sky”
A blazar is an active galactic nucleus with a relativistic jet (a jet composed of ionized matter traveling at nearly the speed of light) directed towards the observer. CTA 102 is a blazar-type quasar discovered in the early 1960s in the constellation Pegasus. It is also one of the two great false alarms in theContinue reading “Taking a picture of the most luminous blazar flare ever recorded.”
Simeis 147, also known as the Spaghetti Nebula or Sharpless 2-240 is a supernova remnant in Taurus. It was discovered so late (1952), because it’s dim. I was curious to see what was possible on the low end from my site with the Borg 55 and a H-Alpha filter. So here it is. I haveContinue reading “Simeis 147, the Spaghetti nebula”
This is my first H alpha mosaic, using the Borg 55. It was acquired over the winter of 2018-2019, and one of the goals was to image the Barnard loop (Sh 2-276), a supernova remnant. The mosaic is centered on the horse head dark nebula (Barnard 33). https://erellaz.com/wp-content/uploads/2020/05/Barnard33.jpg
I was looking for a cool Machine Learning project, using Python, of course, and either PyTorch or Tensor Flow, since it’s what the cool kids are doing those days. I have also always had an interest in restoration of old pictures, and sometimes colorizing them, which is a very tedious & time consuming project ifContinue reading “Colorizing old black and white pictures with deoldify”