The nova star in Sagittarius has re-brightened. I captured it in a telephoto closeup.
Here is Nova Sagittarii – likely an exploding white dwarf star – as it appeared before dawn on the morning of March 28. This is the brightest nova visible from the northern hemisphere for many years, though even now it is barely naked eye at fifth magnitude.
After dimming for a few days the nova has re-brightened somewhat. What titanic forces are going on at this white dwarf star causing it to fade then brighten remain to be determined.
It will certainly be worth keeping an eye on. With luck it might really get bright!
This telephoto image frames the “Teapot” configuration of stars that forms the main part of Sagittarius the Archer. The nova has appeared from out of nowhere in the middle of the Teapot just below the lid!
The image is a stack of 4 x 90-second exposures, plus an exposure taken through a Kenko Softon A filter to add the star glows, to accentuate the brighter stars. I shot this from the backyard in New Mexico.
– Alan, March 28, 2015 / © 2015 Alan Dyer / www.amazingsky.com
It’s a nova needle in a Milky Way haystack – an exploding star appears in Sagittarius.
On March 15 a very observant amateur astronomer in Australia spotted a star in Sagittarius that wasn’t there the night before. It was a nova, Latin for “new.”
But this was not a new star forming, but an old star in the process of dying.
This star is likely an ancient white dwarf drawing material off a close companion. When the in-falling material builds up on the surface of the white dwarf it ignites in a nuclear explosion, causing the star to brighten, in this case by hundreds of times.
At its peak last week, Nova Sagittarii was just bright enough to see naked eye. It is now below 5th magnitude and barely naked eye. In my long exposure photo it appears lost amid the blaze of stars in the Sagittarius Milky Way.
Still, this was the brightest nova visible from the northern hemisphere in many years. Indeed, we haven’t had a really bright naked-eye nova since the 1970s.
Considering all those stars, you’d think some would blow up for us to enjoy!
– Alan, March 26, 2015 / © 2015 Alan Dyer / www.amazingsky.com