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Astrophotography
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| Hornblower | Date: Thursday, 07.07.2016, 12:35 | Message # 571 |
 World Builder
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| Astronomy Picture of the Day
[Source]
[Astronomy Picture of the Day]
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| Hornblower | Date: Friday, 22.07.2016, 14:35 | Message # 572 |
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World Builder
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| So many galaxies! Wow the universe is big 
Source
Edited by Hornblower - Friday, 22.07.2016, 14:36 |
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| Watsisname | Date: Friday, 22.07.2016, 18:15 | Message # 573 |
 Galaxy Architect
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United States
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| Beautiful gravitational lens. 
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| Hornblower | Date: Friday, 22.07.2016, 21:02 | Message # 574 |
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| Watsisname, I agree, but it must be a huge galaxy because you can see plenty of galaxies in front of it! What a massive universe!
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| Watsisname | Date: Friday, 22.07.2016, 23:37 | Message # 575 |
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Galaxy Architect
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| It is a big galaxy, but most of the galaxies are actually in the background.  The foreground galaxy is the yellowish, giant elliptical at center, with some other members of the cluster around it (the few larger galaxies throughout the frame). The gravity of the giant elliptical distorts the view of the background galaxies into thin arcs -- this is the gravitational lens, which also reveals how massive the elliptical galaxy is. About 100 trillion solar masses! (and much of this is dark matter).
The distances involved here span many billions of light years. The foreground galaxy is about 4 billion light years distant. One of the lensed galaxies is 11.6 billion light years away (by light travel time), or 21.5 billion light years by co-moving distance!
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| Hornblower | Date: Friday, 22.07.2016, 23:58 | Message # 576 |
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| Quote Watsisname (  ) most of the galaxies are actually in the background.
Then why are some of the galaxies not distorted here? If they were behind the galaxy, wouldn't they also get lenses. Therefore, the unaffected ones would be in the foreground (if I am not mistaken)
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| Watsisname | Date: Saturday, 23.07.2016, 00:08 | Message # 577 |
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Galaxy Architect
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| Most, not all. There are many galaxies in the cluster. The big galaxies with resolved structures are foreground, while the small stuff and arcs are background.
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| simonecinque1992 | Date: Saturday, 23.07.2016, 13:54 | Message # 578 |
 Pioneer
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Italy
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| Astronomy picture of the day
My Mods and Addons
Packard Bell
Windows 10 Pro
Intel® Celeron® CPU 1000M @ 1.80GHz 1.80 GHz
4 GB
64 bit Operative System
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| Hornblower | Date: Saturday, 23.07.2016, 14:16 | Message # 579 |
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World Builder
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| Have any of you amateur astronomers realized how the positions of Mars and Saturn cause Scorpio to look more like Andromeda?
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| Fireinthehole | Date: Tuesday, 26.07.2016, 22:43 | Message # 580 |
 Pioneer
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Sweden
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| Quote Hornblower ( ) Have any of you amateur astronomers realized how the positions of Mars and Saturn cause Scorpio to look more like Andromeda?
More like Triangulum. 
Love SpaceEngine!
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| Watsisname | Date: Sunday, 31.07.2016, 11:52 | Message # 582 |
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Galaxy Architect
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United States
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| Those are awesome! Love the rotating Mars animation.
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| midtskogen | Date: Monday, 01.08.2016, 05:09 | Message # 583 |
 Star Engineer
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Norway
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| ISS has some nice passes here. Heavens above predicted it would reach 19 degrees towards the south, and they were quite correct.
NIL DIFFICILE VOLENTI
Edited by midtskogen - Monday, 01.08.2016, 05:10 |
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| Watsisname | Date: Monday, 01.08.2016, 08:21 | Message # 584 |
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Galaxy Architect
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United States
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| Nice! Is that about as high as the ISS gets for you? Here I am just south of its northernmost arcs.
Using Heavens Above or other pass-prediction sites to spot the ISS is a great way to wow people at outdoor evening events. It amazes me how many people have never seen it before.
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| midtskogen | Date: Monday, 01.08.2016, 10:18 | Message # 585 |
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Star Engineer
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Norway
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| Quote Watsisname ( ) Is that about as high as the ISS gets for you?
Not about, but precisely as high. That's why ISS was worth a look last night.
Wikipedia tells me that ISS has an inclination of 51.65 deg and an altitude of 409 - 416 km. The picture shows ISS reaching 19.2 degrees, which is 19.15 corrected for refraction, as seen from 59.97N. This gives me a computed altitude of 412.2 km for ISS [assuming it passed dead south], which is within the altitude given by Wikipedia. This is assuming a spherical earth, but these calculations should still be accurate within a few tens of a degree for sure.
EDIT: Heavens Above says it was at maximum altitude for my position (59.97N 10.65E) at 23:24:07 last night and ISSTracker.com gives ISS' position at that time as 51.77N 11.29E and 406.9 km altitude. Using this position I calculate an altitude of 404.6 km, which is within reasonable uncertainties.
So, in its current orbit, it doesn't get higher (had I been slightly further to the east, the altitude would be 0.02 degrees higher, though, but that's less than a pixel in the image).
NIL DIFFICILE VOLENTI
Edited by midtskogen - Monday, 01.08.2016, 10:39 |
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