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Captured with a 180 mm diameter telescope. The animation spans 20 minutes, with 20-second intervals between frames. edit: Also available as a smaller-sized H2

by gattr 3y ago

Captured with a 180 mm diameter telescope. The animation spans 20 minutes, with 20-second intervals between frames. edit: Also available as a smaller-sized H264 MP4 [1]. [1] https://www.cloudynights.com/gallery/image/182808-ar-3354-animation-in-wl/ https://www.cloudynights.com/gallery/image/182808-ar-3354-an...

jcims 3y ago
Nicely done! Any idea what the field of view is?
- gattr 3y ago
  Thanks! The horizontal FOV is around 5 arcminutes. The granules (the bright convection cells comprising most of the image around the sunspots) are about 1000 km across on average.
  - jcims 3y ago
    That’s wild!
  - keepamovin 3y ago
    What are the features apart from the granules? The black feathers rimming the totally dark areas? What are these up close?
    - jcims 3y ago
      Wikipedia has it has a pretty great article on sunspots. https://en.m.wikipedia.org/wiki/Sunspot https://en.m.wikipedia.org/wiki/Sunspot Your question got me curious, those are called penumbral filaments. Their form has to do with the orientation of the magnetic field relative to the surface of the sun.
thghtihadanacct 3y ago
Nice. Now this is quality content. GJ
dylan604 3y ago
I have long decided that my next major astro purchase would be for solar observation, so I'm very jelly!! The closest I've gotten is being a little hacker and written a wget script to download from SOHO, but I feel like that's cheating compared to you ;-)
- gattr 3y ago
  For photospheric observations/imaging like here (also called "white light") you only need the inexpensive Baader AstroSolar film fitted onto your existing instrument (telescope, binoculars, photographic lens). ...but beware the unrelenting "I need bigger aperture and to travel to better-seeing locations".
  - dylan604 3y ago
    >..but beware the unrelenting "I need bigger aperture and to travel to better-seeing locations". that's one of the compelling reasons to get into solar observations. if we ever get to a point of worrying about light pollution blocking our view of the sun... my current astro rig is specific for deep sky objects, and is a very wide angle telescope. when i observe the moon, maybe 50% of the FOV is the moon, so i want a different scope for viewing solar system objects that I can then attach said solar filters.

by gattr 3y ago

jcims 3y ago

Nicely done! Any idea what the field of view is?

gattr 3y ago
Thanks! The horizontal FOV is around 5 arcminutes. The granules (the bright convection cells comprising most of the image around the sunspots) are about 1000 km across on average.
- jcims 3y ago
  That’s wild!
- keepamovin 3y ago
  What are the features apart from the granules? The black feathers rimming the totally dark areas? What are these up close?
  - jcims 3y ago
    Wikipedia has it has a pretty great article on sunspots. https://en.m.wikipedia.org/wiki/Sunspot https://en.m.wikipedia.org/wiki/Sunspot Your question got me curious, those are called penumbral filaments. Their form has to do with the orientation of the magnetic field relative to the surface of the sun.

thghtihadanacct 3y ago

Nice. Now this is quality content. GJ

dylan604 3y ago

I have long decided that my next major astro purchase would be for solar observation, so I'm very jelly!! The closest I've gotten is being a little hacker and written a wget script to download from SOHO, but I feel like that's cheating compared to you ;-)

gattr 3y ago
For photospheric observations/imaging like here (also called "white light") you only need the inexpensive Baader AstroSolar film fitted onto your existing instrument (telescope, binoculars, photographic lens). ...but beware the unrelenting "I need bigger aperture and to travel to better-seeing locations".
- dylan604 3y ago
  >..but beware the unrelenting "I need bigger aperture and to travel to better-seeing locations". that's one of the compelling reasons to get into solar observations. if we ever get to a point of worrying about light pollution blocking our view of the sun... my current astro rig is specific for deep sky objects, and is a very wide angle telescope. when i observe the moon, maybe 50% of the FOV is the moon, so i want a different scope for viewing solar system objects that I can then attach said solar filters.