IPB

Welcome Guest ( Log In | Register )

 
Reply to this topicStart new topic
A ring fpr Haumea
MarcF
post Oct 11 2017, 05:59 PM
Post #1


Member
***

Group: Members
Posts: 202
Joined: 16-May 06
From: Geneva, Switzerland
Member No.: 773



Haumea was already weird with its size, shape, color and moons. Now it has also a ring :-)

http://www.nature.com/nature/journal/v550/...otcallback=true

"Here we report observations from multiple Earth-based observatories of Haumea passing in front of a distant star (a multi-chord stellar occultation). Secondary events observed around the main body of Haumea are consistent with the presence of a ring with an opacity of 0.5, width of 70 kilometres and radius of about 2,287 kilometres. The ring is coplanar with both Haumea’s equator and the orbit of its satellite Hi’iaka. The radius of the ring places it close to the 3:1 mean-motion resonance with Haumea’s spin period..."

Best regards
Marc
Go to the top of the page
 
+Quote Post
Patteroast
post Oct 11 2017, 09:11 PM
Post #2


Junior Member
**

Group: Members
Posts: 43
Joined: 31-May 05
From: Bloomington, Minnesota
Member No.: 397



I'm super surprised. I would have thought the weird torquing non-co-planar orbits of Hi'iaka and Namaka would have made a ring system harder to maintain, not to mention what kind of tidal effects would happen with a non-spherical world! But I admittedly know basically nothing about orbital mechanics.

Another point in favor of Haumea being the TNO I most want to get a spacecraft to in my lifetime.
Go to the top of the page
 
+Quote Post
Explorer1
post Oct 12 2017, 03:42 AM
Post #3


Senior Member
****

Group: Members
Posts: 1448
Joined: 13-February 10
From: Ontario
Member No.: 5221



Apparently the new albedo measurements show it to be darker than previously thought (and thus larger). Even a 'New Horizons 2' style flyby could take advantage of the fast rotation, map more of the surface at high-resolution. We need a mission out there; badly!
Go to the top of the page
 
+Quote Post
vikingmars
post Oct 12 2017, 07:51 AM
Post #4


Member
***

Group: Members
Posts: 817
Joined: 19-February 05
From: Close to Meudon Observatory in France
Member No.: 172



A world with an oval shape and rings...
Remember the novel "Mission of Gravity" by Hal Clement ? wink.gif
A Sci-fi novel worth to be read.
Attached Image
Go to the top of the page
 
+Quote Post
TheAnt
post Oct 12 2017, 05:52 PM
Post #5


Member
***

Group: Members
Posts: 482
Joined: 12-February 12
Member No.: 6336



The fast rotating Haumea have been found to have a ring, even before finishing reading the text I had a notion there might be a connection with the fast rotation.
Amd the press release do indeed mention possible "....dispersal of surface material due to the planet's high rotational speed". (Yes the text say 'planet' not me.)
Anyway the findings presented on a page by the Andalusian center for astrophysics.
Go to the top of the page
 
+Quote Post
nprev
post Oct 13 2017, 04:07 AM
Post #6


Senior Member
****

Group: Admin
Posts: 7988
Joined: 8-December 05
From: Los Angeles
Member No.: 602



ADMIN NOTE: Two topics were started almost simultaneously for this story; they've been merged into the first one posted.


--------------------
A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
Go to the top of the page
 
+Quote Post
TheAnt
post Oct 13 2017, 03:24 PM
Post #7


Member
***

Group: Members
Posts: 482
Joined: 12-February 12
Member No.: 6336



QUOTE (Explorer1 @ Oct 12 2017, 05:42 AM) *
We need a mission out there; badly!


I agree, though one interesting possibility, cryovolcanism was based on the idea that Haumea was unusually bright.
Now that it's darker, perhaps its not the case. Yet Haumea remain among the more interesting of several KBO worlds.

Thales Alenia Space have made a study, not just for a flyby but orbiter!
It have several different mission profiles and proposed engines as it seem to be a bit of a speculation in future technologies.
The achilles heel is the power production, where they propose beta-voltaic batteries/panels which are long lived.
But even with predicted improvements to the technology still will not provide enough power. (24W/Kg predicted improvement to the technology, while 50W/kg needed for a 20 year mission profile.)

And the text do indeed have the title 'A preliminary assessment of an orbiter in the Haumean system.'

@vikingmars: I have indeed read "Mission of Gravity", and Haumea will also have variable gravity.
So you are proposing that the spacecraft need to have a lander that fails after it have landed and taken measurements? wink.gif
Go to the top of the page
 
+Quote Post
Explorer1
post Oct 13 2017, 08:15 PM
Post #8


Senior Member
****

Group: Members
Posts: 1448
Joined: 13-February 10
From: Ontario
Member No.: 5221



I recall that in Clement's novel, the probe's scientific data is fully recovered by the natives; can't rely on that with Haumea!
Any idea how much surface gravity varies from the equator to the poles?
Go to the top of the page
 
+Quote Post

Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 19th October 2017 - 07:37 AM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and copyright.

OPINIONS AND MODERATION
Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators.
SUPPORT THE FORUM
Unmannedspaceflight.com is a project of the Planetary Society and is funded by donations from visitors and members. Help keep this forum up and running by contributing here.