With a new hydrogen-alpha filter added to the camera’s filter wheel it is time to re-image some of these old favorites. The filter is a narrow-band filter allowing through a slice of the spectrum only a few nano-meters wide. The filter pass-band is centered on 656nm deep in the red, the glow of neutral hydrogen gas, this allows sharp images of these glowing nebulae complexes.
Supernova 2020jfo in M61 is not the only supernova occurring at the moment. Actually there are over sixty supernova in progress at the moment that we know of. The modern transient search programs locate them by the dozens, and while the average large galaxy might have one supernova a century, there are an enormous number of galaxies we can observe while monitoring for those great explosions.
Currently the brightest supernova is 2020hvf at magnitude 12.4 hosted by galaxy NGC3643 in Leo. Unlike the pretty face-on spiral of M61, this small 14th magnitude galaxy is completely outshone by the supernova. Looking at the image one is struck by the realization that for a week or two that one star is outshining the combined light of the hundreds of billions of other stars that make up an entire galaxy.
Shot photos from the driveway again last night. Several hours shooing at the heart of the Virgo cluster and Markarian’s Chain.
I was shooting color data, but clouds rolled through the field before I got any blue data. Will have to shoot again another evening. In the meantime I put together a monochrome version.
The two big elliptical galaxies towards the lower right are M84 and M86. In the center is an interacting spiral galaxy NGC4438, notably distorted through interaction with NGC4435 seen right above it. The big elliptical at lower left is M87.
Do not try to count the number of galaxies here, zoom in and dozens upon dozens become visible.
A clear night finally appeared, clouds have been plaguing this particular dark of the Moon. What to do? Maybe do some astrophotography?
I have a new piece of kit, a ZWO ASI Air Pro that has been on back-order since November. With shutdowns in China and the rest of the mayhem it finally arrived this week.
The unit is a little dedicated astrophotography computer that makes a lot of the setup so much easier, while simplifying the snarl of cables on the telescope.
Controlling the camera, filter wheel, and guiding is done through a very nice app on the iPad. In less than an hour I had the basics figured out and was taking images.
A few technical issues to learn about through the night, such as how to best configure the WiFi for use with the home network, how to access and download the images to the desktop computer, etc., but no real problems. I took images through until dawn’s glow appeared in the data, running from twilight to twilight.
Just getting back into astrophotography after quite a few years of observing visually. A new camera, updated software, it seems like I am learning all over again.
For a first run I processed a monochrome image of M31, the Andromeda Galaxy. A quick run of fourteen luminance frames, 8 at 5 minutes, 6 at 60 seconds combined into a single frame.
I have color data for this image, but that will be a lot more processing. Given all of the various filters and calibration frames I really need to get the automated batch processing running before I do much color work.
By the time this is posted, by the time you read this, the eclipse will be long over. You will have been flooded by images and descriptions of this event from thousands of sources. However, this blog is a personal diary, I will put down my thoughts and memories before they grow dim, post my photos, and preserve the experience for myself.
Our plan was simple, camp out well ahead of time in a site that had been carefully selected and scouted. Jody and Larry camped along side this little pretty meadow earlier in the summer, noting that it would serve quite well. They also arrived first, five days before the eclipse, and minutes ahead of others that sought this same place.
The plan worked, and worked well. In the days leading up to the eclipse dozens of vehicles came past, each looking with envy at those who had arrived early to claim the best spots. The stream of vehicles continued late into Sunday eve, no matter, this forest offers room for all.
The island is home to a vibrant community of photographers, a mix of professionals and serious amateurs. There is one set of photos everyone, and I do mean everyone wants… Dual lasers on the Milky Way.
Just occasionally both of the keck telescopes, and both lasers, are focused on the center of the galaxy, both stabbing right at the heart of the Milky Way.
Opportunities to see and photograph this are few, and occur strictly during the summer months of June to August, when the Milky Way is high overhead. furthermore, these opportunities occur only when Andre Ghez and her UCLA Galactic Center Group have both telescopes scheduled.
July 25th was such a night, a good opportunity to get both lasers. Andrea’s group has the first half of the night, turning over the ‘scopes to other astronomers just after midnight. Actually there were a few nights this particular week, we just chose the 25th. After this galactic center season is over, at least until next year.
Eighty four images representing four and a half hours of exposure on the target. In this case NGC2244, the Rosette Nebula. It takes a few minutes to setup the software to align all of the images, then it takes about half an hour for the software to digest everything and produce a result. At the end of this you get to see if the effort worked. Sometimes it does not.
Complicating the issue is that a number of the sub-frames are taken at different exposures. Finding the correct stars in the these different exposures gives the software fits.