OSIRIS-REX mission to 1999 RQ36 (Bennu), New Frontiers Mission to Launch in 2016 |
OSIRIS-REX mission to 1999 RQ36 (Bennu), New Frontiers Mission to Launch in 2016 |
Sep 27 2017, 06:54 AM
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#61
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
Are these images actually circular rather than rectangular? Not sure what you mean by this. QUOTE And can we expect those drop outs (?) as the "norm"? Did you actually read the caption? "The dark vertical streaks at the top of the image are caused by short exposure times (less than three milliseconds). Short exposure times are required for imaging an object as bright as Earth, but are not anticipated for an object as dark as the asteroid Bennu, which the camera was designed to image." That said, I'm not sure why short exposure times would cause streaking like that -- maybe blooming from the horizontal register? -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Sep 27 2017, 10:39 AM
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#62
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Not sure what you mean by this. I'd guess the jagged limb Earth displays indicating this is an orthographic projection (due to noticeable s/c motion or whatever) instead of a straight-up RGB composite. -------------------- |
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Sep 27 2017, 01:53 PM
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#63
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Senior Member Group: Moderator Posts: 3241 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
I thought they were truncated lines due to undercompression. We saw that with Galileo and Cassini, though on Cassini, we had truncated lines every other line to allow for interpolation.
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Sep 27 2017, 03:36 PM
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#64
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Senior Member Group: Members Posts: 1452 Joined: 26-July 08 Member No.: 4270 |
I thought it might have been a reprojection as well but you can see some of the image goes above the limb of the planet on the upper-left side. I'm at work right now so I don't have the ability to circle it in an image, I'm afraid. The whole picture looks like it was taken through a circular window that's slightly misaligned/off-centre with Earth.
-------------------- -- Hungry4info (Sirius_Alpha)
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Sep 27 2017, 04:31 PM
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#65
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
I guess this is what Hungry's referring to - this is a gamma-tweaked crop:
You can see that it looks like the image was masked to black outside a circle. It's noticable at the top of the frame because the mask follows the true edge of the Earth which is in shadow there (the phase is slightly gibbous) rather than the visible limb. Presumably this was done to get rid of some noise in the black regions. Hopefully they didn't mask out too much of the bright limb, but the bright limb looks too sharp (ie it looks aliased) rather than PSF-y as you'd expect... |
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Sep 28 2017, 06:26 PM
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#66
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
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Oct 11 2017, 05:34 AM
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#67
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
Earth anf Moon in color
http://www.asteroidmission.org/?latest-new...arth-moon-color |
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Jan 30 2018, 10:12 PM
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#68
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Member Group: Members Posts: 655 Joined: 22-January 06 Member No.: 655 |
Earth anf Moon in color http://www.asteroidmission.org/?latest-new...arth-moon-color Late reply, but fantastic image. reminds me of Carl Sagan's famous 'pale blue dot' quote: “Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there-on a mote of dust suspended in a sunbeam" I'm seriously missing Cassini-Huygens, but starting to get excited about this mission now - I wonder what Bennu will be like? Itokawa-esque? Similar to Eros? Mathilde? Gaspra? Hoping that there's a suitable place to take a sample without hazardous terrain - an area of 'ponding' perhaps, that's free of large boulders or gravel that's too large for the sample-arm to capture. Only seven months away now.... |
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Aug 24 2018, 08:03 AM
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#69
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Newbie Group: Members Posts: 11 Joined: 1-March 10 Member No.: 5237 |
August 17th 2018,
Osiris Rex officially started the Approach Phase to Bennu, https://www.asteroidmission.org/asteroid-operations/ |
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Aug 24 2018, 02:18 PM
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#70
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Member Group: Members Posts: 813 Joined: 29-December 05 From: NE Oh, USA Member No.: 627 |
NASA Teleconference today at 2pm Eastern
NASA to Host Media Briefing on Mission to Return Asteroid Sample to Earth https://www.nasa.gov/press-release/nasa-to-...sample-to-earth |
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Oct 3 2018, 04:51 PM
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#71
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Hi folks, just doing a little thread maintenance. I created a new forum for OSIRIS-REx, and am closing this early thread. Please move on to the Asteroid Approach thread to discuss science operations!
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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