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FORUM UMUM => Lain-lain hal => Topic started by: mymoon on January 28, 2008, 07:25:47 PM



Title: Warna sebenar SATURN
Post by: mymoon on January 28, 2008, 07:25:47 PM
Beberapa gambar SATURN telah di paparkan di falak online. Semua nya berbeza warna.

Yang peliknya gambar2 dari NASA sendiri pun berbeza warna.  sama juga dalam buku2 planet dan general astronomy.

contoh dari NASA(© Copyright belongs to the respective organisations)

1. Voyager 1 on November 3, 1980

(http://www.solarviews.com/thumb/sat/saturn4.jpg)


2. dari Voyager 2 tahun 1981

(http://www.solarviews.com/thumb/sat/saturn.jpg)


3. with the 2.6 meter Nordic Optical Telescope, located at  Canary Islands.

(http://www.solarviews.com/thumb/sat/satnor.jpg)

4. Hubble 1997

(http://apod.nasa.gov/apod/image/9703/saturncol_hst.jpg)

5.October 2004, Cassini

(http://www.solarviews.com/thumb/pia/PIA06193.jpg)




The above are  mosaic consisting of many images acquired in a tile-like fashion, covering one end of Saturn's rings to the other and the entire planet in between. The images were taken over the course of many hours and the  subtle colour variations are recorded with special computer-processing techniques. These highly enhanced colour view was assembled from clear, orange and ultraviolet frames and the conventional RGB frames.

BTW I was advised by my e-friends that SATURN takes approx 10.5 hours to complete one turn on its axis. So in order not to detect the rotation of the planet, limit exposure to the 0.25 arcsec of motion(don't ask me why, one day i will figure this out) ie for SATURN not more than 240 sec.

Bagi saya semuanya betul lah :-D :-D

Kepada yang berminat sila layari http://pds-rings.seti.org/saturn/earthbased/displaysaturn.html (http://pds-rings.seti.org/saturn/earthbased/displaysaturn.html)
 
Saturn pastel colours; bands of subtle colour - yellows, browns, grays  - distinguish differences in the clouds over Saturn. Saturn's high-altitude clouds are made of colourless ammonia ice. Above these clouds is a layer of haze or smog, produced when ultraviolet light from the sun shines on methane gas. The smog contributes to the planet's subtle colour variations.


cheers




Title: Re: Warna sebenar SATURN
Post by: universe24 on January 29, 2008, 02:25:39 PM
We can have various color of Saturn...and actually nothing is called true color. If we insist there got true color, that must be the color that see by our own eye.
From various kind of color of Saturn, there got one simple basis, that is, the result should look beautiful.