IPB

Welcome Guest ( Log In | Register )

8 Pages V  < 1 2 3 4 > »   
Reply to this topicStart new topic
Stereo
Jim from NSF.com
post Jul 3 2006, 03:00 PM
Post #16


Member
***

Group: Members
Posts: 321
Joined: 6-April 06
From: Cape Canaveral
Member No.: 734



QUOTE (djellison @ Jul 3 2006, 10:31 AM) *
MER like redundency in that there's two spacecraft I suppose.

Doug


Unlike MER, both spacecraft are required to complete the mission objectives. After all, the mission name isn't MONO
Go to the top of the page
 
+Quote Post
djellison
post Jul 3 2006, 03:19 PM
Post #17


Administrator
****

Group: Chairman
Posts: 13712
Joined: 8-February 04
Member No.: 1



True - but you still get 'something', even if it's not the full mission objectives - one could rescue something from a mixture of SOHO + One stereo spacecraft perhaps.

Doug
Go to the top of the page
 
+Quote Post
RNeuhaus
post Jul 3 2006, 03:47 PM
Post #18


Senior Member
****

Group: Members
Posts: 1636
Joined: 9-May 05
From: Lima, Peru
Member No.: 385



QUOTE (djellison @ Jul 3 2006, 09:31 AM) *
Looking at the Orbit sims (and I'm not sure how accurate they are w.r.t. SKM's or TCM's ) - by something like 2010, they'll be on opposite sides of the sun from one another, and by 2012 - they'll be in almost 120 degree seperation around the sun, with the Earth at the third point, abnd by 2014, they'd overtake one another not far from a solar conjunction smile.gif ...now THAT is looking in Stereo smile.gif

The Stereo orbit would be very complicated with many Moon and Earth fly-by, so its path around the sun would not be a curviline straight line. I seems that there will be two spacecraft brothers Stereo? Ones will be placed at about 22 degree ahead and the other will be lagging 22 degree from Earth? But, I realized that it is not so. There will be only one spacecraft Stereo taking the advantage of Moon gravity to use a series of lunar swingbys to redirect the spacecraft ahead and behind of Earth. blink.gif



Rodolfo
Go to the top of the page
 
+Quote Post
djellison
post Jul 3 2006, 03:58 PM
Post #19


Administrator
****

Group: Chairman
Posts: 13712
Joined: 8-February 04
Member No.: 1



Yup - two spacecraft launched together that separate after launch, and then they both use Lunar flybys - one a month after the other, to chuck one ahead of the Earth, and one behind.

Doug
Go to the top of the page
 
+Quote Post
RNeuhaus
post Jul 3 2006, 04:35 PM
Post #20


Senior Member
****

Group: Members
Posts: 1636
Joined: 9-May 05
From: Lima, Peru
Member No.: 385



QUOTE (djellison @ Jul 3 2006, 10:58 AM) *
Yup - two spacecraft launched together that separate after launch, and then they both use Lunar flybys - one a month after the other, to chuck one ahead of the Earth, and one behind.

Doug

Oppsss, NASA is getting toys even most sophisticated to play with! It is seen that NASA is getting a mastery of fly-by to any celestial bodies.

Rodolfo
Go to the top of the page
 
+Quote Post
bdunford
post Jul 13 2006, 03:14 PM
Post #21


Junior Member
**

Group: Members
Posts: 29
Joined: 11-July 06
From: Springville, UT
Member No.: 965



According to the updated STEREO site, the launch is now scheduled for August 1.


--------------------
Go to the top of the page
 
+Quote Post
BPCooper
post Jul 18 2006, 03:36 PM
Post #22


Member
***

Group: Members
Posts: 183
Joined: 22-October 05
From: Daytona Beach / Cape Canaveral, FL
Member No.: 534



Off to the next window, August 20th.


--------------------
Go to the top of the page
 
+Quote Post
bdunford
post Jul 18 2006, 03:42 PM
Post #23


Junior Member
**

Group: Members
Posts: 29
Joined: 11-July 06
From: Springville, UT
Member No.: 965



Your photography is stunning. Very slick work.


--------------------
Go to the top of the page
 
+Quote Post
BPCooper
post Jul 28 2006, 09:20 PM
Post #24


Member
***

Group: Members
Posts: 183
Joined: 22-October 05
From: Daytona Beach / Cape Canaveral, FL
Member No.: 534



Thanks...

Aug 31 at the earliest now as they check the Delta second stage for leaks.


--------------------
Go to the top of the page
 
+Quote Post
BPCooper
post Aug 21 2006, 11:02 PM
Post #25


Member
***

Group: Members
Posts: 183
Joined: 22-October 05
From: Daytona Beach / Cape Canaveral, FL
Member No.: 534



Once again postponed, STEREO is now slated for the next window which opens September 18th.


--------------------
Go to the top of the page
 
+Quote Post
BPCooper
post Sep 2 2006, 04:48 PM
Post #26


Member
***

Group: Members
Posts: 183
Joined: 22-October 05
From: Daytona Beach / Cape Canaveral, FL
Member No.: 534



Yet again:

STATUS REPORT: ELV-090106


Expendable Launch Vehicle Status Report

Mission: STEREO (Solar Terrestrial Relations Observatory)
Launch Pad: 17-B, Cape Canaveral Air Force Station
Launch Vehicle: Boeing Delta II
Launch Date: No earlier than Oct. 18, 2006
Launch Time: TBD

A decision was made to remove the STEREO second stage from the launch vehicle and perform inspection from inside the propellant tank to verify it is structurally sound for flight.

The launch of STEREO is now targeted for no earlier than Oct. 18. An electrical checkout of the vehicle is under way due to lightning strikes within a one-third mile radius of Complex 17 during the passing of Tropical Storm Ernesto.

The STEREO observatories remain at the Astrotech Space Operations Facility. Today technicians removed the transportation canister from around the payload to begin the process of reconditioning the batteries and preparing for the storage period (currently about 30 days). The twin spacecraft will remain in storage until the necessary course of action for the Delta II can be more clearly defined. There was no effect on the STEREO spacecraft from Tropical Storm Ernesto.


--------------------
Go to the top of the page
 
+Quote Post
RNeuhaus
post Sep 4 2006, 06:53 PM
Post #27


Senior Member
****

Group: Members
Posts: 1636
Joined: 9-May 05
From: Lima, Peru
Member No.: 385



Another problem that Stereo spacecraft is facing: Boeing engineers at the firmís Decatur, Ala., rocket-manufacturing facility discovered during routine testing that the rocketís second stage leaked. The problem was traced back to an oxidizer tank Boeing buys from Alcatel Alenia Space in Turin, Italy.

Delta 2 Tank Worries Delay STEREO Launch

Rodolfo
Go to the top of the page
 
+Quote Post
BPCooper
post Oct 22 2006, 02:30 AM
Post #28


Member
***

Group: Members
Posts: 183
Joined: 22-October 05
From: Daytona Beach / Cape Canaveral, FL
Member No.: 534



Thought I would post the reminder that the STEREO spacecraft are set for launch Wednesday night aboard a Delta 2 rocket from Cape Canaveral.

The launch weather forecast calls for excellent conditions with a 90% chance of good weather. You can get the forecast and updates at www.SpaceflightNow.com.

The launch will be on NASA Television (www.nasa.gov/ntv for the webcast).


--------------------
Go to the top of the page
 
+Quote Post
edstrick
post Oct 22 2006, 10:50 AM
Post #29


Senior Member
****

Group: Members
Posts: 1869
Joined: 20-February 05
Member No.: 174



There will be a pre-launch briefing on Stereo:
http://www.nasa.gov/multimedia/nasatv/MM_NTV_Breaking.html

October 24, Tuesday
1 - 3 p.m. - STEREO Prelaunch Press Conference and Mission Science Briefing - KSC (Public and Media Channels)

That's Eastern time.
Go to the top of the page
 
+Quote Post
RNeuhaus
post Oct 23 2006, 02:34 AM
Post #30


Senior Member
****

Group: Members
Posts: 1636
Joined: 9-May 05
From: Lima, Peru
Member No.: 385



There will be three months so they will be flying toward to their Lagrange Points: L4 (ahead of Earth) and L5 (behind of Earth).

Enclosed is a cut article from http://stereo.gsfc.nasa.gov/mission/design.shtml


For the first three months after launch, the two observatories will fly in highly elliptical orbits extending from very close to Earth to just beyond the Moon's orbit. STEREO Mission Operations personnel at the Johns Hopkins University's Applied Physics Laboratory (APL) in Laurel, Maryland, will synchronize spacecraft orbits so that about two months after launch they encounter the Moon, at which time one of them is close enough to use the Moon's gravity to redirect it to a position "behind" Earth. Approximately one month later, the second observatory will encounter the Moon again and be redirected to its orbit "ahead" of Earth.


The following link will show you clearly on how the Stereos spacecraft will get into their respective final points: http://stereo.gsfc.nasa.gov/gallery/movies...REO_phasing.mov

A very elegant fly-by design. It is like to play a ball game. That is to have a very precise aim to get up to there.

Rodolfo
Go to the top of the page
 
+Quote Post

8 Pages V  < 1 2 3 4 > » 
Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 2nd August 2014 - 04:32 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.