Stephan’s Quintet

A Closer Look

This portrait of Stephan’s Quintet, also known as the Hickson Compact Group 92, was taken by the ‘new’ Wide Field Camera 3 (WFC3) aboard the NASA/ESA Hubble Space Telescope. Stephan’s Quintet, as the name implies, is a group of five galaxies. The name, however, is a bit of a misnomer. Studies have shown that group member NGC 7320, at upper left, is actually a foreground galaxy that is about seven times closer to Earth than the rest of the group. Read the rest here at spacetelescope.org

Click on the images for a little more details.

Credit: The fantastic Hubble Space Telescope and the incredible army of folks who make it all possible.

JN Ph7.5


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Stephan’s Quintet in HST-Subaru Composite

Source: Hubble Legacy Archive and 8.2 Meter Subaru Telescope (NAOJ)

Image Assembly and Processing: Robert Gendler and Judy Schmidt

Distance: 260 million light years

This small group of spiral galaxies was first discovered by the French astronomer, Edouard Stephan in 1877 and is often considered the prototype of small compact galactic groups.

It is the first of the compact groups found and probably the most investigated at all wavelengths. Initially Stephan included five relatively bright members (NGC 7317, 7318A/B, 7319, and 7320). In 1961 red shift measurements of the group revealed that NGC7320, the largest member of the group, had a discordant redshift and is receding at a velocity 5000 kilometers per second slower than the other four members.

A redshift is considered discordant if it differs from the median redshift of the group by more than 1000 kilometers per second. Although the case of NGC 7320 still fuels controversy it is generally agreed that all members of the group are gravitationally interacting with the exception of the interloper NGC 7320 which is a foreground galaxy.


All the years we’ve known each other, I’ve always had feelings for you. I have my boyfriend, and you have your girlfriend. I love him, and you love her. But I still can’t help feeling like we belong together. I love talking to you. I know we will never and up together, but I can’t help but to hope. A part of me is still hoping that if we meet, everything will be just right. Just perfect. I really want to taste your lips… At least once.

Stephan’s Quintet plus one

The first identified compact galaxy group, Stephan’s Quintet is featured in this remarkable image constructed with data drawn from Hubble Legacy Archive and the Subaru Telescope on the summit of Mauna Kea. The galaxies of the quintet are gathered near the center of the field, but really only four of the five are locked in a cosmic dance of repeated close encounters taking place some 300 million light-years away. The odd man out is easy to spot, though. The interacting galaxies, NGC 7319, 7318A, 7318B, and 7317 have a more dominant yellowish cast. They also tend to have distorted loops and tails, grown under the influence of disruptivegravitational tides. The mostly bluish galaxy, NGC 7320, is in the foreground about 40 million light-years distant, and isn’t part of the interacting group. Still, captured in this field above and to the left of Stephan’s Quintet is another galaxy, NGC 7320C, that is also 300 million light-years distant. Of course, including it would bring the four interacting galaxies back up to quintet status. Stephan’s Quintet lies within the boundaries of the high flyingconstellation Pegasus. At the estimated distance of the quintet’s interacting galaxies, this field of view spans over 500,000 light-years.

Image assembly & processing: Robert Gendler and Judy Schmidt 
Image data: Subaru Telescope (NAOJ), Hubble Legacy Archive, R. Gendler

Press Spoilers

7316 Monday 12 October 7pm – 7.30pm 

Kirin is wary of Jai’s methods

Andy tells James his worries over Pete

Jimmy sets Finn an unusual challenge  

7317 Tuesday 13 October 7pm – 7.30pm 

Jai puts Kirin in an impossible situation

Chrissie fears for Lawrence

Chas is rattled by Emma  

7318 Wednesday 14 October 7pm – 7.30pm  

The police stage a reconstruction

Rakesh learns what Kirin did

Leyla sets her plan in motion at the B&B  

7319 Thursday 15 October 2015 7pm – 7.30pm 

Adam’s discovery shakes his faith in Aaron

Rakesh uncovers a secret

Leyla ropes Finn into her plan  

7320 Thursday 15 October 2015 8pm – 8.30pm 

Aaron is arrested

Pollard is left seething

Kerry gives Bernice advice  

7321 Friday 16 October 2015 7pm – 7.30pm 

The Dingles present a united front

Chas fears for her safety

Victoria is angered by Adam


read it on AO3 at http://ift.tt/29pFHrS

by xShieru

Lance doesn’t pine for anyone ever, Keith’s never been to a dance, Hunk tries his best to be supportive, Shiro is very done, and Pidge steals a car.

But hey, it could’ve been worse.

Words: 7319, Chapters: 1/1, Language: English

read it on AO3 at http://ift.tt/29pFHrS