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Our Beautiful Universe - Photos and Videos

  1. May 9, 2017 #241

    Andy Resnick

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    M51 is directly overhead now- getting some great viewing. This is the central 1:1 crop from a 3X dithered stack, using images with a star FWHM < 3.6 pixels using the 400/2.8 wide open, 13 second exposures, ISO 800. Total time = 34 min. It's still noisy, but that's ok given the small number of frames.

  2. May 18, 2017 #242

    Andy Resnick

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    This part of the sky borders Virgo and Coma Berenices, in this image there are 7 Messier objects and approximately 100 NGC and IC objects visible:


    This is the central 60% of the frame (400mm field of view), 2h 15m total acquisition time. I also have two neighboring fields of view that, when stitched, provide an 8 x 11 degree field of view, comprising 13 Messier objects and hundreds of NGC/IC objects.

    This part of the sky is moving out of my viewing area, next up is the great cluster in Hercules...
  3. May 22, 2017 #243
    GRAIL's Gravity Map of the Moon
    "This image shows the variations in the lunar gravity field as measured by NASA's Gravity Recovery and Interior Laboratory (GRAIL) during the primary mapping mission from March to May 2012. Very precise microwave measurements between two spacecraft, named Ebb and Flow, were used to map gravity with high precision and high spatial resolution. The field shown resolves blocks on the surface of about 12 miles (20 kilometers) and measurements are three to five orders of magnitude improved over previous data. Red corresponds to mass excesses and blue corresponds to mass deficiencies. The map shows more small-scale detail on the far side of the moon compared to the nearside because the far side has many more small craters."
    Source: http://solarsystem.nasa.gov/galleries/grails-gravity-map-of-the-moon

  4. May 22, 2017 #244


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    How does this compare to a visual image? Do the spots correspond to different kinds of crater impacts (heavy object left behind versus no object left in the hole)?
  5. May 22, 2017 #245
    Good question... sadly I don't know. I don't even know how the far side of the Moon looks like, so I'll go check on the net now... :smile:
  6. May 22, 2017 #246
  7. May 28, 2017 #247
    I was googling around for nice astrophotos to use as desktop backgrounds, and stumbled upon this nice one of the Andromeda galaxy by Lorenzo Comolli:
    (Source: http://apod.nasa.gov/apod/ap130626.html)
  8. Jun 5, 2017 #248
    A nice view of NZ :ok:
  9. Jun 8, 2017 #249


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  10. Jun 8, 2017 #250
    Yup, It's a great shot of the South Island. I believe your old neighborhood is in this one if I'm not mistaken.
  11. Jun 8, 2017 #251


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    just off the frame a bit beyond the head of the arrow :smile:

  12. Jun 9, 2017 #252
    Mimas over Saturn:
    (Source: http://phys.org/news/2017-06-image-mimas-saturn-north-pole.html)


    To @Andy Resnick and others:
    Andy, I've stumbled upon two links I'd like to share:

    Focus stacking (with Photoshop):
    Photoshop Playbook: How to Blend Multiple Images with Different Depths of Field (youtube)

    Noise reduction stacking
    (a method with Photoshop and some other software, I doubt it's better than DeepSkyStacker, but anyway):
    A Look at Reducing Noise in Photographs Using Median Blending

    We have very cloudy skies over here at the moment, and no noise reduction method will fix that... I am waiting for clear skies...
    Last edited: Jun 9, 2017
  13. Jun 9, 2017 #253
  14. Jun 28, 2017 #254
    I figure this thread has room for one more awesome shot of a familiar planet.:smile:
  15. Jul 5, 2017 #255
  16. Jul 5, 2017 #256


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    wonderful photo of red sprites
    I have yet to photo these, still on my bucket list :smile:

    I have a stormchaser friend that photo's them quite often .... here's an example .....


  17. Jul 5, 2017 #257
    I agree, those things are amazing to look at. I wonder, without video, would anyone ever get lucky enough to photo them? seems like even on "burst" setting a still camera shot would be extremely long odds of recording them. I notice there seems to be many more Sprite images out there than the Blue Jets, are the Sprites more common ?.
  18. Jul 5, 2017 #258


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    I devoted an entire thread to that image about 6 years ago. I think I looked at it too closely.
    Of course, that was before Marcus got me hooked on Ceres, so some of the things I said appear to be incorrect.
    It is a composite, just not what I would have called "composite" back then.
  19. Jul 6, 2017 #259


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    An actual photo from Saturn's rings, taken by Cassini (only cleaned to remove cosmic rays and detector noise). Source

  20. Jul 24, 2017 #260

    Andy Resnick

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    Ring Nebula (M57): first image is full frame (800/5.6), 1h 46m exposure, second is a 1:1 crop.



    Lots of objects are in view now (for me): Jupiter, Saturn and Pluto are all favorably positioned and Cygnus is coming into view. One more clear night to see if I can capture Pluto....
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