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From the Moon to Earth in HD
Posted by
Zonk
on Wed Nov 14, 2007 06:47 PM
from the tiny-grey-marble dept.
from the tiny-grey-marble dept.
Lucas123 writes "The Japan Space Agency's Kaguya spacecraft is currently orbiting the moon and its equipment is being tested in preparation for its real mission to map the moon with high-definition images later this month. Almost as an afterthought, the space craft has recreated one of the most memorable photos
in the history of spaceflight — an Earth-rise from lunar orbit."
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a bit misleading (Score:5, Funny)
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Apollo (Score:5, Interesting)
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The optics package is probably not large enough to resolve to the required level of detail (unless that was a specific mission goal for them). Perhaps someone with more time and inclination could break out the old college physics textbook, flip to the optics section, and calculate the size of the lens necessary to spot a 3m^2 object from an orbital altitude of sixty miles?
Re:Apollo (Score:4, Informative)
Parent
Re:Apollo (Score:5, Funny)
Parent
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http://physics.ucsd.edu/~tmurphy/apollo/apollo.html [ucsd.edu]
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These are fake! (Score:4, Funny)
Top that crazy conspiracy theory!
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The Moon: A Ridiculous Liberal Myth (Score:3, Funny)
Earth doesn't move (Score:4, Insightful)
That would be incredibly useful for navigation!
The article seemed to misstate this fact:
Since the moon's rotation matches the Earth's rotation of the sun, the Earth will always appear to be in the same spot if seen by an astronaut standing on the moon.
Doesn't that infer the moon's rotation is 365.25 days?
Dan East
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No. If you thing of the earth and moon as orbiting each other, the earth could be considered in geostationary orbit. The earth and moon as they circle each other has the same side of the moon facing the earth at all times.
http://www.learner.org/channel/courses/essential/earthspace/session7/closer1.html [learner.org]
Orbital period (days) 27.32166
Rotational period (days) 27.32166
http://www.solarviews.com/eng/moon.htm [solarviews.com]
The moon has about 13 days a year.
Re:Earth doesn't move (Score:4, Funny)
Orbital period (days) 27.32166
Rotational period (days) 27.32166
http://www.solarviews.com/eng/moon.htm [solarviews.com]
The moon has about 13 days a year.
Moon farmer: Borry? Listen here, city girl. You can't just borry oxygen. Oxygen doesn't grow on trees. You'll have to work it off doing chores on my hydroponic farm. You can return to your precious park at sun-up.
Fry: I guess we can do chores for a few hours.
Leela: Night lasts two weeks on the moon.
Moon farmer: Yep, goes down to minus-173 degrees.
Fry: Celsius or Fahrenheit?
Moon farmer: First one, then the other.
Parent
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The moon is tidal locked with Earth.
When a given moon is small enough compared to the planet it orbits (Earth-Moon) the bigger object has the ability to drastically change the orbit of the smaller one. When two rotating bodies orbit each other, they raise tides in each other. These tides cause mechanical friction. So tidal activity absorbs a lot of energy out of the rotational energy of the bodies. In ot
Am I the only one who was reminded of Star Strike? (Score:2)
Need better images (Score:2)
Here's some real HD... (Score:2, Informative)
http://history.nasa.gov/ap08fj/photos/b/as08-14-2383.jpg [nasa.gov]
http://apod.nasa.gov/apod/image/mars_surface_vik2_big.jpg [nasa.gov]
http://oursun.open.ac.uk/images/jupiterp_cassini_full.jpg [open.ac.uk]
What makes this new "first HD camera in space" so special (yes, I know the Apollo images are shot on film, but Viking and Voyager had video cameras)?
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So what? (Score:2)
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Some movies (Score:4, Informative)
http://www.jaxa.jp/press/2007/11/20071113_kaguya_e.html#pict01 [www.jaxa.jp]
and these movies of EarthRise and EarthSet
http://space.jaxa.jp/movie/20071113_kaguya_movie01_e.html [space.jaxa.jp]
http://space.jaxa.jp/movie/20071113_kaguya_movie02_e.html [space.jaxa.jp]
on TV in HD today (Score:3, Informative)
Mini-series? (Score:2)
The Earth never rises from the Moon (Score:2)
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I assume that the concept of "the Earth rising from the Moon" is an artifact of the Satellite orbiting the Moon...
From the JAXA Selene site that is linked to from TFA:
we use the expression "Earth-rise" in this press release, but the Earth-rise is a phenomenon seen only from satellites that travel around the Moon, such as the KAGUYA and the Apollo space ship. The Earth-rise cannot be observed by a person who is on the Moon as they can always see the Earth at the same position.
HD? (Score:3, Insightful)
But I was a little disappointed by the categorization of "HD"
Those seemed like pretty 'standard def' to me...
Are there higher res shots somewhere else?
That's no moon! (Score:3, Funny)
Re:Not in HD (Score:5, Informative)
http://www.selene.jaxa.jp/image/communication/img_071114_01.jpg [selene.jaxa.jp]
http://www.selene.jaxa.jp/image/communication/img_071114_02.jpg [selene.jaxa.jp]
1920x1080
Couldn't find anything else though. Disappointing.
Parent
Re:Not in HD (Score:5, Informative)
http://dayton.hq.nasa.gov/IMAGES/LARGE/GPN-2001-000009.jpg [nasa.gov]
The older image appears to be higher resolution.
Parent
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The original photo was more than likely FILM, not digital. They had to wait for the astronauts to come home before developing it. From the probe they're doing "HD" resolution and the image is NOW baby! :)
I kind of like NOW over "film at 11"... but that's just me.
Re:Not in HD (Score:4, Interesting)
Parent
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Re:Not in HD (Score:4, Insightful)
Comparing to the medium format still footage by Apollo's Bill Anders (Whom I've had the pleasure of briefly meeting when he was flying a P51 around here recently), Bill's photos are exposed more for the lunar surface than the earth. It appears that the white clouds of earth are overexposed when the moon is in correct exposure, at least in the one shot linked above. The HD camera probably has a comparable or a little less exposure leniency depending on whether the Apollo cameras used slide or negative film. (I think they were slide?)
The JAXA footage has the earth exposed nicely and the moon is out of peak range, with most features deep in a medium grey. This has an advantage of bringing out the contour features on the lunar surface better. Also, seeing the progression of sunrise really looks interesting with no atmosphere. Landing on the moon at the perpetual twilight line would give one unlimited time to walk around and frame the earth against numerous lunar features. With the enlarged size of the earth, it will take less telephoto length to capture it at a reasonable size in the frame.
--Mike
Parent
Max resolution (Score:2, Informative)
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2. follow it to JAXA's site
3. ?????
4. see high res!
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You can say a lot of crap about NASA but at least they don't deface their images, and they're pretty good about sending sending press kits and other information out to anyone who wants it.
What's next, DRM on the videos?
IMAX (Score:3, Insightful)
And we already have quite a bit of IMAX footage.
Public Relations (Score:5, Informative)
High Definition as a proper noun generally refers to 1920x1080 resolution, but the various space agencies have produced much higher resolution images for years. The 35mm film shot during the Apollo missions is being scanned into 3070x2044 pixel images, for example, and the medium format film is being scanned at a huge 12800x12800 pixels. The Mars rovers carry 1 MP (1024 x 1024) cameras, and the images are often stitched together into far larger mosaics. I've seen some that even as JPG's take up over 100 MB (and crash IE). The Hubble Space Telescope's highest resolution camera is also only 1024x1024 pixels, and I believe this was chosen to approximate the maximum resolution of the optics, but again, large mosaics are common.
The High Resolution Imaging Scientific Experiment (HiRISE) camera aboard the Mars Reconnaisance Orbiter takes a different approach and is what's called a "push broom camera." Instead of taking rectangular pictures every so often, it scans a single line of up to 20,000 pixels continuously at the rate the spacecraft moves over the ground. In this way it builds up images up to 40,000 pixels long (800 megapixels...now that's high def!), at which point the file has to be transmitted to earth or the camera runs out of memory.
Parent
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You fail the Kahn test. You are thinking two dimensionally.
Up would be away from the nearest gravity source.