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web

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the losses you're in the northern crown
 
welcome stargazers

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and in re guess astronomer from the
 
Cincinnati Observatory

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and I'm James all very director the key
 
cassava pop planetarium in Gainesville

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Florida

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this week we're gonna show you one of
 
the most exquisite little constellations

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in the summer sky

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and its easy to find if you have fairly
 
dark skies

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and you're away from city lights and you
 
use our

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old arc to work to restrict what are we
 
talking about

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let's show you okay we've got our skies
 
set up for this week between nine and 10

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p.m.

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your local time if you look to the
 
northwest you find our old friend the

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Big Dipper

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using our old trick drawing an imaginary
 
line

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following the archive the dippers handle
 
we will art to the closest bright star

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our terrace remember arc tartars then

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instead of continuing that arc to speed
 
on to spike a in the constellation Virgo

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or simply hang a right at arc to risk
 
and then look slightly

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East a bit for the star alpaca affect is
 
not nearly as bright as arc tourists

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but it's the brightest star in its part
 
in the sky affect is the brightest star

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and a half circle stars we call Corona
 
borealis

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the northern crown at this time here
 
Corona borealis is almost directly

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overhead between nine and 10 p.m.

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the reason of ECA so much brighter than
 
the other stars in the crown

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is because it is so much closer to us
 
the star is

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only 75 light years away now

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although alf ECA is a lovely star in the
 
crown there's a far more

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interesting one it's called T Corona
 
borealis

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or more popularly blaze Starr almost 150
 
years ago something very peculiar

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happened to the star

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most of the time T Corona borealis is so
 
damn

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they can only be seen through a
 
telescope however

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just one year after the ended the Civil
 
War on may twelfth

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1866 astronomers solve the star

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erupt into such blazing brilliance by
 
the

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end of the night it was actually
 
brighter the brightest star in the crown

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alf ECA amazed by this incredible
 
outburst

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astronomers calculated that its light
 
had increased twenty-five hundred times

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by the next night and are already begun
 
to fade and just one week later

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it was once again invisible to the naked
 
eye what in heaven's name happened to it

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and would it ever be seen again well the
 
answer to that question is yes

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but it wouldn't be seen again by those
 
who had originally witnessed

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eighty years later on February 9th 1946

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T Corona borealis flared up again
 
although the astronomers a

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1946 didn't understand the complete
 
picture

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they were able to determine that the
 
outer layers have the star

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had exploded and we're expanding away
 
from the star

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generate over 2700 miles per sec

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later study showed that while the
 
brightest star in the crown

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a factor was only 75 light years away
 
take roddenberry alice is over 2600

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light years away

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which meant that for to become even
 
brighter than of ECA

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it would have had to have blazed in just
 
a few hours time

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from its normal fifty times brighter
 
than our Sun to over 200,000 times

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brighter than our Sun

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so what could cause this well
 
astronomers now know that T Corona

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borealis

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is actually two stars a giant red star
 
with a blue white dwarf companion as the

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stars

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orbit each other gas is gravitationally
 
exchange between the two

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every so often the super hot dwarf star
 
reaches a critical level of gas

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collected from the cool red giant star
 
its outer layers have gas

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violently explode and fling their
 
material through out the heavens

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causing the dwarf star to become
 
thousands of times brighter

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in just a few seconds and then after the
 
gases shed

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the star quickly dims back to its normal
 
invisible to the naked eye brightness

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and the whole flow process of
 
accumulating guess to yet another

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critical level begins

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astronomers call this a recurrent Nova
 
so the question is

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will the Los jewel in the crown teak
 
roddenberry of Brighton again in our

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lifetime

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well we have to wait until 2026 to see
 
it again

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who knows but one night if you're lucky
 
you may see the loss in June love the

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northern crown blazing away

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in all its brilliance for one brief
 
night and one night only

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if you simply remember to heap looking
 
up

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ok