A Space & astronomy forum. SpaceBanter.com

Go Back   Home » SpaceBanter.com forum » Astronomy and Astrophysics » Hubble
Site Map Home Authors List Search Today's Posts Mark Forums Read Web Partners

UA Scientist Sheds New Lights On Outer Planets With Hubble SpaceTelescope



 
 
Thread Tools Display Modes
  #1  
Old January 23rd 04, 06:51 PM
external usenet poster
 
Posts: n/a
Default UA Scientist Sheds New Lights On Outer Planets With Hubble SpaceTelescope

UA SCIENTIST SHEDS NEW LIGHTS ON OUTER PLANETS WITH HUBBLE SPACE TELESCOPE
From Lori Stiles, UA News Services, 520-621-1877
January 22, 2004

-------------------------------
Contact Information
Erich Karkoschka
520-621-3994


Related Web site
http://hubblesite.org/news/2004/05
----------------------------------

Uranus and Neptune aren't the identical egg-blue twins they appear to be in
natural color, according to NASA Hubble Space Telescope images released
today.

Erich Karkoschka of the University of Arizona Lunar and Planetary Laboratory
used different color filters on Hubble's Space Telescope Imaging
Spectrograph and the Advanced Camera for Surveys for the observations, taken
in August 2003.

Karkoschka used red, green, and blue light filters to show Uranus and
Neptune in their natural colors. He used other filters, including
near-infrared, for enhanced views. Enhanced views show that Uranus and
Neptune are two different worlds.

"I took extraordinary care that the natural-color images are very close to
what a human would see from a spacecraft near these planets," he said. "The
enhanced-color images show how an instrument with different spectral
sensitivity than that of the human eye can change the view. There is more to
everything than what the eye can see."

The new images show how Uranus's rotational axis is tilted almost 90 degrees
to Neptune's axis. The south poles of Uranus and Neptune are both tilted
slightly toward Earth. Uranus shows greater contrast between its
hemispheres, which may be caused by its extreme seasons.

Bands of clouds and haze are aligned parallel to the equator on both
planets. Colors in the bands show layers of clouds and haze at different
altitudes and thicknesses.

Some cloud features appear bright orange or red, a color caused by methane
absorption in the red part of the spectrum. Methane is the third most
plentiful gas in both planets' atmospheres, second only to hydrogen and
helium.

Uranus' faint rings and several of its satellites are visible in a wider
view of Uranus. These include Uranus' bright moon Ariel and darker moons
Desdemona, Belinda, Portia, Cressida, and Puck.

Karkoschka has been studying the atmospheres of outer planets for 21 years,
first as a graduate student and since as a researcher with UA's Lunar and
Planetary Laboratory. He has used the Hubble Space Telescope to take images
of Saturn and Titan, as well as Uranus and Neptune, to study the vertical
structure of their gases and aerosols. He made spectroscopy observations at
the European Southern Observatory in 1993 and 1995 for more such data.

Karkoschka is currently modeling Saturn's atmosphere based on images of that
planet he took with the Hubble Space Telescope in March 2003. These images
are currently featured in the cover story of Arizona Alumnus, the winter
2004 issue.

The Space Telescope Science Institute (STScI), which released the Uranus and
Neptune images today, has electronic images files and more information
on-line at http://hubblesite.org/news/2004/05

The Space Telescope Science Institute (STScI) is operated by the Association
of Universities for Research in Astronomy, Inc. (AURA), for NASA, under
contract with the Goddard Space Flight Center, Greenbelt, MD. The Hubble
Space Telescope is a project of international cooperation between NASA and
the European Space Agency (ESA).
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Sedna, space probes?, colonies? what's next? TKalbfus Policy 265 July 13th 04 12:00 AM
PDF (Planetary Distance Formula) explains DW 2004 / Quaoar and Kuiper Belt hermesnines Astronomy Misc 10 February 27th 04 03:14 AM
UA Scientist Sheds New Lights On Outer Planets With Hubble Space Telescope Ron Science 3 January 26th 04 02:38 PM
UA Scientist Sheds New Lights On Outer Planets With Hubble Space Telescope Ron Astronomy Misc 0 January 22nd 04 10:05 PM
Incontrovertible Evidence Cash Amateur Astronomy 6 August 24th 03 07:22 PM


All times are GMT +1. The time now is 07:25 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 SpaceBanter.com.
The comments are property of their posters.