May 11th, 2017: Double Dipper

xoxoxoBruce · 05-10-2017, 10:55 PM

One up and one down... or vise versa. The Big Dipper and it's reflection.

Quote:

one of the most commonly recognized configurations of stars on the northern sky: the Big Dipper. This grouping of stars is one of the
few things that has likely been seen, and will be seen, by every generation. The Big Dipper is not by itself a constellation. Although
part of the constellation of the Great Bear (Ursa Major), the Big Dipper is an asterism* that has been known by different names to
different societies.

*a prominent pattern or group of stars, typically having a popular name but smaller than a constellation.

Quote:

Five of the Big Dipper stars are actually near each other in space and were likely formed at nearly the same time. Connecting two
stars in the far part of the Big Dipper will lead one to Polaris, the North Star, which is part of the Little Dipper. Relative stellar motions
will cause the Big Dipper to slowly change its configuration over the next 100,000 years.

It's reassuring that it will be there for me for the next 100K years.

link

Snakeadelic · 05-11-2017, 07:43 AM

For a stunning shot on the opposite end of the cosmic time scale, check out today's APoD, which is the Crab Nebula imaged by 4 orbiting scopes and 1 ground-based. The light from its original star exploding reached the Earth only about 1000 years ago, making the Crab a very young astronomical event from our viewpoint.

orthodoc · 05-11-2017, 03:47 PM

What a gorgeous pic, Bruce! Thanks.

xoxoxoBruce · 05-11-2017, 09:00 PM

We've seen a lot of spectacular pictures of space from satellites and big telescopes. I like this one because it's something I've personally seen and can pick out of the night sky, instead of just being told trust us, it's up there somewhere.

SPUCK · 05-16-2017, 02:18 AM

Nice picture!

I walk my dog for about an hour every night around midnight so the Dipper 'n me see a lot of each other.

I'm trying to understand why the stars in the lake are time-smeared but the sky ones aren't.

glatt · 05-16-2017, 07:33 AM

Good eye!

Except I think the stars in the lake are not time smeared. It's some other kind of smearing. Maybe photoshop. If they were time smeared, you would see them forming arc of a circle pivoting around an invisible point in the upper (upper because it's a reflection) left part of the picture. In other words, the star trails in the water would be more horizontal.

*searches around*

Like this.
Name: reflected star trail.jpg
Views: 768
Size: 78.8 KB

Name: reflected star trail.jpg
Views: 768
Size: 78.8 KB

Happy Monkey · 05-16-2017, 11:17 AM

I think they're water-smeared. Lights reflected in water will usually have a vertical trail, due to ripples. That water is remarkably calm, but not completely.

Gravdigr · 05-16-2017, 02:20 PM

I think HapMo has the gist of it.

xoxoxoBruce · 05-16-2017, 05:55 PM

Yes, water reflections of a point of light aren't sharp.

SPUCK · 05-17-2017, 10:40 PM

Concur.

05-11-2017, 03:47 PM	#3
orthodoc Not Suspicious, Merely Canadian Join Date: Oct 2006 Posts: 3,774	What a gorgeous pic, Bruce! Thanks. __________________ The greatness of a nation and its moral progress can be judged by the way its animals are treated. - Ghandi

05-11-2017, 09:00 PM	#4
xoxoxoBruce The future is unwritten Join Date: Oct 2002 Posts: 71,105	We've seen a lot of spectacular pictures of space from satellites and big telescopes. I like this one because it's something I've personally seen and can pick out of the night sky, instead of just being told trust us, it's up there somewhere. __________________ The descent of man ~ Nixon, Friedman, Reagan, Trump.

05-16-2017, 11:17 AM	#7
Happy Monkey I think this line's mostly filler. Join Date: Jan 2003 Location: DC Posts: 13,575	I think they're water-smeared. Lights reflected in water will usually have a vertical trail, due to ripples. That water is remarkably calm, but not completely. __________________ _________________ \|...............\| We live in the nick of times. \| Len 17, Wid 3 \| \|_______________\| [pics]

05-16-2017, 02:20 PM	#8
Gravdigr The Un-Tuckian Join Date: Apr 2007 Location: South Central...KY that is Posts: 39,517	I think HapMo has the gist of it. __________________ These statements have not been evaluated by the FDA, EPA, FBI, DEA, CDC, or FDIC. These statements are not intended to diagnose, cause, treat, cure, or prevent any disease. If you feel you have been harmed/offended by, or, disagree with any of the above statements or images, please feel free to fuck right off.

05-16-2017, 05:55 PM	#9
xoxoxoBruce The future is unwritten Join Date: Oct 2002 Posts: 71,105	Yes, water reflections of a point of light aren't sharp. __________________ The descent of man ~ Nixon, Friedman, Reagan, Trump.

05-11-2017, 07:43 AM	#2
Snakeadelic Banned Join Date: May 2015 Posts: 660	For a stunning shot on the opposite end of the cosmic time scale, check out today's APoD, which is the Crab Nebula imaged by 4 orbiting scopes and 1 ground-based. The light from its original star exploding reached the Earth only about 1000 years ago, making the Crab a very young astronomical event from our viewpoint.

05-16-2017, 02:18 AM	#5
SPUCK Professor Join Date: Oct 2006 Posts: 1,911	Nice picture! I walk my dog for about an hour every night around midnight so the Dipper 'n me see a lot of each other. I'm trying to understand why the stars in the lake are time-smeared but the sky ones aren't.

05-16-2017, 07:33 AM	#6
glatt ™ Join Date: Jul 2003 Location: Arlington, VA Posts: 27,717	Good eye! Except I think the stars in the lake are not time smeared. It's some other kind of smearing. Maybe photoshop. If they were time smeared, you would see them forming arc of a circle pivoting around an invisible point in the upper (upper because it's a reflection) left part of the picture. In other words, the star trails in the water would be more horizontal. searches around Like this.

05-17-2017, 10:40 PM	#10
SPUCK Professor Join Date: Oct 2006 Posts: 1,911	Concur.

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