IPB

Welcome Guest ( Log In | Register )

 
Reply to this topicStart new topic
2007 OR10 likely the third-largest known KBO
Mongo
post Mar 11 2016, 02:52 AM
Post #1


Member
***

Group: Members
Posts: 723
Joined: 13-June 04
Member No.: 82



Large size and slow rotation of the trans-Neptunian object (225088) 2007 OR10 discovered from Herschel and K2 observations

QUOTE
We present the first comprehensive thermal and rotational analysis of the second most distant trans-Neptunian object (225088) 2007 OR10. We combined optical light curves provided by the Kepler space telescope -- K2 extended mission and thermal infrared data provided by the Herschel Space Observatory. We found that (225088) 2007 OR10 is likely to be larger and darker than derived by earlier studies: we obtained a diameter of d=1535^{+75}_{-225} km which places (225088) 2007 OR10 in the biggest top three trans-Neptunian objects. The corresponding visual geometric albedo is p_V=0.089^{+0.031}_{-0.009}. The light curve analysis revealed a slow rotation rate of P_rot=44.81+/-0.37 h, superseded by a very few objects only. The most likely light-curve solution is double-peaked with a slight asymmetry, however, we cannot safely rule out the possibility of having a rotation period of P_rot=22.40+/-0.18 h which corresponds to a single-peaked solution. Due to the size and slow rotation, the shape of the object should be a MacLaurin ellipsoid, so the light variation should be caused by surface inhomogeneities. Its newly derived larger diameter also implies larger surface gravity and a more likely retention of volatiles -- CH4, CO and N2 -- on the surface.


I think that as it's likely the third-largest known KBO, with a possible atmosphere, this object deserves a thread of its own. Somebody should tell Mike Brown that it's high time that he named this object. As the leader of the discovery team, he's the only one who is allowed to name it under the current system, but he has not bothered to do so for almost a decade. Every other known KBO out there that's even remotely close to it in diameter has long since been officially named.
Go to the top of the page
 
+Quote Post
elakdawalla
post Mar 11 2016, 04:35 AM
Post #2


Administrator
****

Group: Admin
Posts: 5172
Joined: 4-August 05
From: Pasadena, CA, USA, Earth
Member No.: 454



It's not up to Mike to name it; it's his former student who discovered it, Meg Schwamb. He's as irritated as you are that it doesn't have a name yet. She wants to involve the public but hasn't had the time, being a student and then a postdoc who needed to focus on other things. But she just said that it was her new year's resolution to name it this year, so, hopefully, soon.


--------------------
My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
Go to the top of the page
 
+Quote Post
HSchirmer
post Mar 11 2016, 07:16 PM
Post #3


Member
***

Group: Members
Posts: 684
Joined: 24-July 15
Member No.: 7619



QUOTE (elakdawalla @ Mar 11 2016, 04:35 AM) *
It's not up to Mike to name it; it's his former student who discovered it, Meg Schwamb.


Well, Megan is supposed to mean pearl, something informal like "Black Pearl" or perhaps "Pearl's black world".
Go to the top of the page
 
+Quote Post
MarcF
post Apr 9 2019, 09:41 PM
Post #4


Member
***

Group: Members
Posts: 241
Joined: 16-May 06
From: Geneva, Switzerland
Member No.: 773



2007 OR10, is finally about to be named. The public can vote until May 1st. Gonggong, Holle or Vili ?
I wonder what could be the choice of the name for its moon !
See:
https://2007or10.name/index.html?fbclid=IwA...YbjnSJIxw#names
Regards,
Marc
Go to the top of the page
 
+Quote Post
Marcin600
post May 29 2019, 10:01 PM
Post #5


Member
***

Group: Members
Posts: 432
Joined: 14-December 15
Member No.: 7860



QUOTE (MarcF @ Apr 9 2019, 11:41 PM) *
2007 OR10, is finally about to be named. The public can vote until May 1st. Gonggong, Holle or Vili ?
I wonder what could be the choice of the name for its moon !
See:
https://2007or10.name/index.html?fbclid=IwA...YbjnSJIxw#names
Regards,
Marc

Gonggong is the winner
Go to the top of the page
 
+Quote Post
Ron Hobbs
post Feb 23 2020, 03:26 AM
Post #6


Member
***

Group: Members
Posts: 204
Joined: 14-April 06
From: Seattle, WA
Member No.: 745



Gonggong is now the official name of 225088.

(225088) Gonggong = 2007 OR10
Discovered at Palomar on 2007-07-17 by M. E. Schwamb, M. E. Brown, and D. Rabinowitz.
(225088) Gonggong = 2007 OR10

Gonggong is a Chinese water god with red hair and a serpent-like tail. He is known for creating chaos, causing flooding, and tilting the Earth; he is often depicted with the head of a human and the body of a snake. Gonggong is often attended by his minister, Xiangliu, a nine-headed poisonous snake monster for whom the satellite is named. [Ref: Minor Planet Circ. 121135]

Minor Planet Center Page
Go to the top of the page
 
+Quote Post

Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 19th March 2024 - 09:31 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 funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member.