Orion and Meteor
Category: Observing
Waiting for T Coronae Borealis
Things change in the sky. Contrary to the stenuous assertions of some, the night sky is not constant, it changes. Stars move, sometimes fairly rapidly, stars fade, and sometimes brighten dramatically.
Then there are novae, stars the flare to a brilliance far beyond their normal lustre. Such a star is T Coronae Borealis, or T CrB for short. This star is a recurrent nova, a star that flares to brilliance once or twice every century.
Sometimes called the Blaze Star, T CrB is normally a dim 10th magnitude star, a star that requires a small telescope to view, lost in a field filled with similar stars. A few times in the annals of astronomy the star has blazed to second magnitude, about 1500 times brighter. In 1866 and 1946 the star rivaled nearby Alphecca, the brightest star in the constellation of Corona Borealis. It may also have been observed in 1217 and again in 1787 giving a rough period of about 80 years.
T CrB is a white dwarf that is stealing material from a stellar companion, a red giant near the end of its own fuel. When that material builds up enough the white dwarf flares into temporary brilliance as a fusion reaction tears across the surface of the stellar remnant. The cycle repeats over the centuries causing these regular novae. Eventually the accumulating mass will be too great and instead of a recurring nova the star will meet its final end as a type Ia supernova.
I am of course among those awaiting the eventual nova. Yesterday evening I took a few images of the field to capture the scene. Hopefully I can take the images again to get a before and during image of T CrB.
Last year T CrB started exhibiting behavoirs similar to what had been measured just prior to the 1946 eruption. As a result we expect the star to go nova on schedule this year, most likely in the next month.
We have been waiting, stargazers keeping an eye on the constellation all summer.
Not yet.
Driveway Sky
A Busy Sun
Solar maximum is upon us and the Sun is a very busy place these days. To the delight of those of use who watch, a parade of large sunspots can be observed crossing the Earth facing side. These magnetic tangles have also been releasing flare after flare, sometimes causing strong araoras here on Earth.
It is cetianly worth the effort to drag the ‘scope into the driveway and take a look. Unfortunately the seeing at the house was poor this morning so the resulting photos are not as sharp as I would like…
Tropical Stargazing
Awaiting Dark
A Misty Night at Kaʻohe
While I have gotten plenty of telescope time lately, it has usually been morning sessions with the old Astrola in my driveway. This is a low effort and thoroughly enjoyable practice that I engage in about half a dozen times each month. Such sessions do mean that my 18″ telescope languishes for far too long in the garage.
I really need to change that.
Thus when my fellow staff at Symbrosia start asking for another star party it made a good excuse to get the big ‘scope out of the garage and under a dark sky.
Continue reading “A Misty Night at Kaʻohe”Solo Stars at Kaʻohe
Morning Observing
First quarter moon… Telescope time.
I find myself reliably rising early, often around 4am, something that seemed to have begun during the pandemic. Those who knew me in my younger years may find this a bit unbeliveable, I used to hate mornings, but now?
The other factoid about island mornings. It is almost always clear. The afternoon and evening clouds have dissipated and clear skies are the rule.
Combine these bits with a love of the sky and the result is morning observing sessions, often half a dozen mornings will be spent out with a telescope in those couple weeks the Moon is absent from the morning sky.
Get up, shrug on some ratty old clothes, and wheel the telescope out of the garage. The ‘scope of choice is almost always the old Astrola, even with larger and more sophisticated telescopes available there is just something about using that old manual ‘scope that I find satisfying.
Perhaps the lack of computer or digital setting circles means it is my own skill enabling my path among the stars. The Astrola does have manual setting circles, but I rarely use those. A star chart, a finder, and starhopping allow me to wander through rather than jump about… I just see more, often stumbling across unexpected bits of beauty.
I have upgraded the Astrola a bit lately, adding a larger finder ‘scope with a wide field eyepiece. It is a 50mm 3D printed finder of my own design allowing me to see more sky at once with fainter stars.
There are a few more days until the bright Moon crosses into the morning sky, a few more mornings you will likely find me out with the ‘scope.
Awaiting Dark
