[SM] Convergence of Venus & Jupiter

[RS Wood]

From the «clearly this means the end of the world» department:
Title: Venus and Jupiter: Together at Last
Author: Kelly Beatty
Date: Thu, 25 Jun 2015 12:10:29 -0400
Link: http://www.skyandtelescope.com/astronomy-news/observing-news/venus-and-jupiter-a-dazzling-duo-062520154/

The two brightest planets are gliding closer together in the early evening sky,
and their celestial dance culminates with an ultra-close pairing on June 30th.

Anyone who pays even cursory attention to the evening sky has surely noticed
that the two brightest planets, Venus and Jupiter, have been drawing closer
together in the west in the evening twilight. At the beginning of June, the two
planets were 20° apart in the sky, about twice the width of your fist held at
arm's length. Week by week, Jupiter and the stars behind it have gradually
slipped lower in the evening twilight. But Venus, due to its rapid orbital
motion around the Sun, has stayed high up.
[image 1][1]

Here's the scene overlooking the town of Terrella in Valencia, Spain, as
captured on June 20, 2015. Venus is at right and Jupiter above center.This
didn't require fancy equipment — just a DSLR camera on a tripod and a zoom lens
set to 85 mm.
José J. Chambó Bris

The resulting slow-motion convergence is setting the stage for a dramatic sky
sight. The warm-up act came on June 19th and 20th, when the planetary duo was
joined by a thin and lovely crescent Moon. Farther to their upper left, and
fainter, was Regulus, the alpha star of Leo. (I was texting all my friends: "Go
outside. Now. Look west!")

But now the spectacle is taking an even more dramatic turn — one you just can't
miss. For eight nights beginning June 27th, these two bright planets will be
within 2° of each other — close enough to cover both with the thumb of an
outstretched hand. In the midst of that weeklong run, on June 30th, Venus and
Jupiter will appear so close together — just ^1/[3]° apart — that they'll look
like a tight, brilliant double star in the evening sky. You'll be able to cover
both with the tip of an outstretched pinky finger. Amazing stuff!

Surely, this spectacle must be some kind of omen. Well, yes, it's a sign from
the heavens to get outside and look! As my S&T colleague Alan MacRobert points
out, a spectacular conjunction like this often gets people started in our
wonderful pastime. "These planetary groupings in the sky have no effect on
Earth or human affairs — except for one," he says. "They can lift our attention
away from our own little world into the enormous things beyond. That's what
amateur astronomers do all the time."
[image 2]

In early evening on June 30th, all eyes will be on Venus and Jupiter, which
create a dramatic "double star" in the western sky after sunset.
Sky & Telescope diagram

In fact, such conjunctions, or close pairings, of these two planets are not
particularly rare. The orbit of Venus is tipped just 3.4° with respect to
Earth's, Jupiter even less at 1.3°. So these close conjunctions are destined to
occur. For example, the two appeared slightly closer together (though not as
high up) before dawn last August 18th, and they'll be separated by about 1°
before dawn on the morning of October 26th.

Sky & Telescope Contributing Editor Fred Schaaf brings up a very interesting
point: this current trio of Venus-Jupiter conjunctions closely resembles a
similar series in 3-2 BC that has been suggested as the Star of Bethlehem. "As
has been the case in 2014–15," he explains, "the first two conjunctions back
then were extremely close, the last one separated by about 1°, all three
occurred not far from Regulus, and all were similarly high up in the sky."

Have a telescope or binoculars handy on June 30th. Both planets will crowd into
the same telescopic field of view, Venus appearing as a fat crescent and round
Jupiter accompanied by its four largest moons. The two planets will appear
nearly the same size — but Jupiter, though much larger in reality, is also much
farther away. On the 30th Venus is 49 million miles (78 million km) from Earth,
and Jupiter is more than 10 times farther out at 564 million miles (908 million
km). Their globes will also contrast dramatically in brightness, with Venus's
crescent appearing dazzlingly white compared to Jupiter's duller, striped cloud
deck.

And be sure to take pictures! Share your best shots with other S&T.com visitors
by posting them in our Online Photo Gallery.[3]
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For a comprehensive guide to upcoming sky events, one that S&T's editors use
every day, get the indispensable RASC Observer's Handbook 2015.[4]

The post Venus and Jupiter: Together at Last[5] appeared first on Sky &
Telescope[6].

Links:
[1]: http://www.skyandtelescope.com/wp-content/uploads/2015-06-21_5586f039c1d68_LJV_150620_light.jpg (link)
[2]: http://www.skyandtelescope.com/wp-content/uploads/Venus-Jupiter_June30ev_f.jpg (image)
[3]: http://www.skyandtelescope.com/astronomy-pictures/ (link)
[4]: http://www.shopatsky.com/rasc-observers-handbook-2015?utm_source=skyandtelescope.com&utm_medium=referral&utm_campaign=sky-KBC-at-150625 (link)
[5]: http://www.skyandtelescope.com/astronomy-news/observing-news/venus-and-jupiter-a-dazzling-duo-062520154/ (link)
[6]: http://www.skyandtelescope.com (link)


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