IPB

Welcome Guest ( Log In | Register )

11 Pages V  « < 3 4 5 6 7 > »   
Reply to this topicStart new topic
IKAROS JAXA Solar Sail mission
punkboi
post Jun 17 2010, 08:41 PM
Post #61


Member
***

Group: Members
Posts: 540
Joined: 25-October 05
From: California
Member No.: 535



Heh, that's what I meant. I worded it wrong smile.gif


--------------------
Go to the top of the page
 
+Quote Post
punkboi
post Jun 18 2010, 06:43 PM
Post #62


Member
***

Group: Members
Posts: 540
Joined: 25-October 05
From: California
Member No.: 535



Hm. I thought DCAM1 was already jettisoned... I guess not

http://www.isas.jaxa.jp/home/IKAROS-blog/?itemid=646

Since IKAROS is spinning at only 1.1 rpm, I would assume the deployment of DCAM1 will be much more stable than that of DCAM2...and that IKAROS will be better framed (much more centered) in the DCAM1 images this time around


--------------------
Go to the top of the page
 
+Quote Post
BrianJ
post Jun 19 2010, 10:18 AM
Post #63


Newbie
*

Group: Members
Posts: 17
Joined: 5-January 06
Member No.: 636



Thanks ngunn, norm and Tolis (and everyone else) for the great info. Sending IKAROS to Apophis (via one or more flybys) is an interesting idea. I have a hunch that it could be possible for an IKAROS type spacecraft to be captured by Venus or maybe Mercury (solar sails work better closer to the sun - not so good for outer solar system). Someone must have studied this possibility, I'll see what I can google. It would also be interesting to get some idea of the numbers involved regarding possible acceleration, dV, etc.

The complexities involved with attitude control of a (slowly) spin-stabilized flexible sail attached to a rigid "hub", using two different methods (hub thrusters / sail variable reflectivity), are fairly mind boggling. I can imagine the whole thing starting to "ripple" like a flag in the wind, or even just wrap itself up into a ball, if you don't do it right!

Amazing stuff.

Thanks and regards,
Brian
Go to the top of the page
 
+Quote Post
Paolo
post Jun 20 2010, 11:14 AM
Post #64


Senior Member
****

Group: Members
Posts: 1720
Joined: 3-August 06
From: 43 35' 53" N 1 26' 35" E
Member No.: 1004



From what I understand of the Google translation of the IKAROS blog http://www.isas.jaxa.jp/home/IKAROS-blog/i....php?itemid=647 it appears that the second camera pod is released today. It is to be jettisoned at a slower relative speed (details of the separation system and separation speeds anyone?) to conduct a longer imaging session from a closer distance.
Anybody knows also how long are the DCAM batteries supposed to last?
Go to the top of the page
 
+Quote Post
djellison
post Jun 20 2010, 04:52 PM
Post #65


Founder
****

Group: Chairman
Posts: 14353
Joined: 8-February 04
Member No.: 1



I would imagine the batteries last far longer than the RF link budget between DCAM and IKAROS can last.
Go to the top of the page
 
+Quote Post
punkboi
post Jun 20 2010, 05:25 PM
Post #66


Member
***

Group: Members
Posts: 540
Joined: 25-October 05
From: California
Member No.: 535



A previous IKAROS blog stated that the DCAM batteries...at least the one for DCAM2...is designed to last 15 minutes


--------------------
Go to the top of the page
 
+Quote Post
brellis
post Jun 21 2010, 02:47 AM
Post #67


Member
***

Group: Members
Posts: 750
Joined: 9-February 07
Member No.: 1700



15 minutes of fame rolleyes.gif
Go to the top of the page
 
+Quote Post
Paolo
post Jun 21 2010, 04:51 PM
Post #68


Senior Member
****

Group: Members
Posts: 1720
Joined: 3-August 06
From: 43 35' 53" N 1 26' 35" E
Member No.: 1004



First picture from DCAM1 released! http://www.jspec.jaxa.jp/ikaros_channel/bn007.html
from much closer to IKAROS than DCAM2
Go to the top of the page
 
+Quote Post
Norm Hartnett
post Jun 22 2010, 01:32 AM
Post #69


Junior Member
**

Group: Members
Posts: 70
Joined: 12-November 06
Member No.: 1354



According to today's blog post (6/22) they are adjusting the spin rate to "The spin rate will be selected to operate at optimum balance with light pressure" and they are seeking the optimum spin rate (now at 1.4 rpm). Also the GAP experiment is being activated under the charge of Kanazawa University.
Go to the top of the page
 
+Quote Post
punkboi
post Jun 28 2010, 08:17 AM
Post #70


Member
***

Group: Members
Posts: 540
Joined: 25-October 05
From: California
Member No.: 535



DCAM1 images finally released

http://www.jspec.jaxa.jp/ikaros_channel/bn009.html


--------------------
Go to the top of the page
 
+Quote Post
pandaneko
post Jun 30 2010, 01:53 PM
Post #71


Member
***

Group: Members
Posts: 817
Joined: 17-April 10
From: Kamakura, Japan
Member No.: 5323



QUOTE (Tom Tamlyn @ Jun 16 2010, 11:09 AM) *
Great picture of the fully deployed sail here (in case there's anyone at umsf.com who doesn't check Emily's blog several times a day.)

TTT


I am not very surprised about this. About 15,16 years ago I was chatting to a prof at ISAS about the anntena opeinng of Halca space intereferometry satellite and asked him about the possibility. He simply flatly said that he would be extremely surprised if it did open up.

Apparently, he had seen it fully opended up at Mitsubishi's kamakura factory and never believed it will open up in space, but it did...

Second generation is going up in 2012, and what follows is some info on that.

http://www.jaxa.jp/pr/brochure/pdf/04/sat24.pdf

Of course, opening mechanisms must be different, I think. Halca anntena was built of very fine metal mesh, as I remember. Ikaros anntena must have been a lot easier to open up, I think. After all, it is a membrane, not a metal mesh.

Pandaneko
Go to the top of the page
 
+Quote Post
JimOberg
post Jul 2 2010, 02:40 PM
Post #72


Junior Member
**

Group: Members
Posts: 43
Joined: 11-March 10
From: Houston, Texas, USA
Member No.: 5259



To continue this line of thought:

What is the possible ultimate fate of Ikaros? Is there a maximum communications range?

Can the inspection camera be also used to image asteroids or comets during a fly-by five or ten years from now, or are they only in the jettisoned pods?? We can still do radio occultation science.

Can it achieve solar system escape velocity?
Go to the top of the page
 
+Quote Post
gwiz
post Jul 3 2010, 09:39 AM
Post #73


Junior Member
**

Group: Members
Posts: 39
Joined: 26-March 09
From: Cornwall
Member No.: 4697



QUOTE (JimOberg @ Jul 2 2010, 03:40 PM) *
To continue this line of thought:

What is the possible ultimate fate of Ikaros? Is there a maximum communications range?

Can the inspection camera be also used to image asteroids or comets during a fly-by five or ten years from now, or are they only in the jettisoned pods?? We can still do radio occultation science.

Can it achieve solar system escape velocity?

From the images I've seen, the on-board cameras are wide-angle, not suitable for distant objects.
Go to the top of the page
 
+Quote Post
punkboi
post Jul 9 2010, 07:12 PM
Post #74


Member
***

Group: Members
Posts: 540
Joined: 25-October 05
From: California
Member No.: 535



http://www.jaxa.jp/index_e.html

July 9, 2010 Updated
IKAROS: Acceleration by solar sail confirmed

The small solar power sail demonstrator "IKAROS," which successfully deployed its solar sail, was confirmed to accelerate by solar sail receiving solar pressure.

This proved that the IKAROS has generated the biggest acceleration through photon during interplanetary flight in history.


--------------------
Go to the top of the page
 
+Quote Post
elakdawalla
post Jul 9 2010, 07:26 PM
Post #75


Administrator
****

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



There's much more info in the Japanese version (Google translate link)


--------------------
My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
Go to the top of the page
 
+Quote Post

11 Pages V  « < 3 4 5 6 7 > » 
Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 17th October 2021 - 03:08 PM
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.