[HN Gopher] Ultra Deep look at Messier 81 and 82
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Ultra Deep look at Messier 81 and 82
Author : sohkamyung
Score : 168 points
Date : 2023-05-08 10:44 UTC (1 days ago)
(HTM) web link (theuberger.ch)
(TXT) w3m dump (theuberger.ch)
| mnw21cam wrote:
| See also: https://www.astrobin.com/7ez0pl/ and
| https://www.astrobin.com/hhegwl/ They were also taken by a group
| of amateurs across the world collaborating.
| jebarker wrote:
| If think the astrobiscuit collaboration images in these links
| were captured using lucky imaging, so a different process to
| the traditional long integration used in the M81/M82 image the
| OP shared. There's a video about it:
|
| https://youtu.be/5s9xbZ5G-wk
| mnw21cam wrote:
| They were a combination of lucky imaging to get the very
| centre of the galaxies in high resolution, and traditional
| long integration for the rest of it. I know, because I
| participated.
| jebarker wrote:
| Oh, good to know, great project. Do you think that lucky
| imaging is going to be more important in the future of
| amateur astrophotography?
| mnw21cam wrote:
| It depends. Thing is, there's plenty to take pictures of
| out there that is big and dim. A camera with a decent
| camera lens (or even a not decent camera lens, at a push)
| on a tripod will get you good results, as long as you can
| collect light for long enough.
|
| By far the greatest thing that improves astrophotography
| is the ability to collect light for a long time, and this
| implies tracking the movement of the stars across the
| sky. I'd say that this is more important than having a
| telescope. Without it, you're limited to taking pictures
| short enough that the stars don't move more than a pixel
| or two in that time, which is typically between a tenth
| of a second and ten seconds, depending on the zoom level
| of your lens. However, you can take multiple pictures and
| combine them. With a tracker, you can easily take
| exposures that are minutes long.
|
| Lucky imaging is useful for things that are very bright,
| and it allows you to sharpen up the image. It works for
| the moon, and the brightest parts of some galaxies or
| nebulae. But the normal things that make spectacular
| astrophotography images aren't really helped by it.
| Mostly, the best thing to make images better is just to
| collect more light. Lucky imaging is great, but it's a
| niche.
| zkirill wrote:
| Is it realistic/practical for amateurs to collaborate on sending
| up a telescope on a balloon so as to elimine the lack of dark sky
| as a factor?
| generalizations wrote:
| At current prices, it might be simpler/easier to send it up as
| a satellite. IIRC, it'd be less than $10k for a 2lb telescope.
| PetitPrince wrote:
| Deep sky astrophotography rely on very long exposure and
| motorized tripod in order to take into account the Earth
| rotation. You can probably put your instrument on a balloon
| (... can you ? telescopes are heavy and voluminous !), but then
| you'll need to track the position of the balloon so that the
| instrument can still point in the right direction. Wind is
| chaotic, so it's probably a nightmare to compensate.
| Eduard wrote:
| Balloon-Borne SuperBIT Telescope Releases 1st Research Images
|
| https://blogs.nasa.gov/superpressureballoon/2023/04/20/ballo.
| ..
| gliptic wrote:
| > To achieve high-precision measurements from a balloon-
| borne environment, the SuperBIT gondola - at roughly 3500
| lbs - stabilizes its telescope to sub-arcsecond precision
| (akin to a three degree-of-freedom Steadicam) while
| sophisticated optics further stabilize the SuperBIT camera
| to < 50 milliarcseconds.
|
| Amazing.
| causi wrote:
| Either there's something wrong with my browser or the site is
| setup so there's no way to view at 100%, just 92% or 110%.
| NKosmatos wrote:
| Total exposure time: 393h 28min, just wow! More info over at
| https://theastroenthusiast.com/collab-processing/
| CosmicShadow wrote:
| That is massive! I feel like I've got a lot when I hit like
| 28h.
| dmreedy wrote:
| 'With grave joy we, the cosmical explorers, who were already
| gathered up into the communal mind of our own galaxy, now found
| ourselves in intimate union with a score of other galactic minds,
| We, or rather I, now experienced the slow drift of the galaxies
| much as a man feels the swing of his own limbs. From my score of
| viewpoints I observed the great snow-storm of many millions of
| galaxies, streaming and circling, and ever withdrawing farther
| apart from one another with the relentless "expansion" of space.
| But though the vastness of space was increasing in relation to
| the size of galaxies and stars and worlds, to me, with my
| composite, scattered body, space seemed no bigger than a great
| vaulted hall.'
|
| - Olaf Stapledon, _Star Maker_
|
| Not much inspires a sense of meaning in me these days like the
| sheer scope and scale and depth of creation.
|
| Beautiful work.
| _joel wrote:
| As a (very) amateur astronomer I'm blown away by the dedication
| of some of these people
| bitL wrote:
| Is there any way to download the whole image to use it as a
| wallpaper?
| eXpl0it3r wrote:
| You seem to be able to download it from here:
| https://www.astrobin.com/tb0sou/
| layer8 wrote:
| https://cdn.astrobin.com/thumbs/LaObmWwdGWXn_16536x0_ieTZ0IN...
| (6000 x 4200 pixels, ~17 MB)
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