Author Topic: Yaogan-II launch  (Read 7492 times)

Online Satori

  • Moderator
  • Global Moderator
  • Senior Member
  • *****
  • Posts: 12618
  • Braga - Portugal
    • Em Órbita
  • Liked: 468
  • Likes Given: 317
Yaogan-II launch
« on: 05/25/2007 08:26 AM »
China has launched a new remote sensing satellite, the Yaogan-II. From Xinhua: http://news.xinhuanet.com/english/2007-05/25/content_6151667.htm

Online Satori

  • Moderator
  • Global Moderator
  • Senior Member
  • *****
  • Posts: 12618
  • Braga - Portugal
    • Em Órbita
  • Liked: 468
  • Likes Given: 317
RE: Yaogan-II launch
« Reply #1 on: 05/25/2007 09:45 AM »

Online Satori

  • Moderator
  • Global Moderator
  • Senior Member
  • *****
  • Posts: 12618
  • Braga - Portugal
    • Em Órbita
  • Liked: 468
  • Likes Given: 317
RE: Yaogan-II launch
« Reply #2 on: 05/27/2007 10:39 PM »
Two photos of the Yaogan-II launch from Xinhua...



Offline Liss

  • Full Member
  • ****
  • Posts: 1031
  • Moscow, Russia
  • Liked: 196
  • Likes Given: 10
RE: Yaogan-II launch
« Reply #3 on: 05/28/2007 09:33 AM »
What's strange is that we've got two different orbits for this launch: three objects are at 97.85 deg, 631x655 km, but the fourth one is at 97.22 deg, 433x457 km. It is not obvious for me what launch profile resulted in these orbits. One may also see that the lower one is decaying rather fast.
This message reflects my personal opinion based on open sources of information.

Offline Skyrocket

  • Extreme Veteran
  • Senior Member
  • *****
  • Posts: 2146
  • Frankfurt am Main, Germany
  • Liked: 318
  • Likes Given: 91
Re: Yaogan-II launch
« Reply #4 on: 05/28/2007 12:07 PM »
Hmm, the higher orbit fits well to the Yaogan-1 orbit (628 x 629 km x 97.8 deg). It is a riddle to me, why for the two Yaogan launches both a three-stage and a two-stage version of the Long March were used.

Offline Liss

  • Full Member
  • ****
  • Posts: 1031
  • Moscow, Russia
  • Liked: 196
  • Likes Given: 10
Re: Yaogan-II launch
« Reply #5 on: 05/28/2007 05:03 PM »
As a wild guess, I'd think that Yaogan 2 is a CAST-2000 based spacecraft which would have a mass of some 800 kg. This still leaves the question of what is Yaogan 1 based on.
This message reflects my personal opinion based on open sources of information.

Online Satori

  • Moderator
  • Global Moderator
  • Senior Member
  • *****
  • Posts: 12618
  • Braga - Portugal
    • Em Órbita
  • Liked: 468
  • Likes Given: 317
Re: Yaogan-II launch
« Reply #6 on: 05/31/2007 01:47 PM »
According to SinoDefence.com the satellite that was launched with Yaogan-II has the designation PiXing-1.

SinoDefence.com also points to the military nature of the Yaogan-II mission.

Offline William Graham

  • Senior Member
  • *****
  • Posts: 4203
  • Liked: 207
  • Likes Given: 87
Re: Yaogan-II launch
« Reply #7 on: 05/31/2007 07:23 PM »
According to Jonathan's Space Report, (http://planet4589.org/space/jsr/latest.html), the second satellite was called MEMS-Pico.

Online Satori

  • Moderator
  • Global Moderator
  • Senior Member
  • *****
  • Posts: 12618
  • Braga - Portugal
    • Em Órbita
  • Liked: 468
  • Likes Given: 317
Re: Yaogan-II launch
« Reply #8 on: 05/31/2007 09:14 PM »
Quote
GW_Simulations - 31/5/2007  2:23 PM

According to Jonathan's Space Report, (http://planet4589.org/space/jsr/latest.html), the second satellite was called MEMS-Pico.

MEMS-Pico looks like a project designation the same way we call OV to the space shuttle. MEMS stands for 'micro-electro-mechanic system'. Never saw the Chinese to give a english designation to their sats.

Offline Liss

  • Full Member
  • ****
  • Posts: 1031
  • Moscow, Russia
  • Liked: 196
  • Likes Given: 10
Re: Yaogan-II launch
« Reply #9 on: 05/31/2007 10:19 PM »
Full name for the 2.5 kg picosat launched with Yaogan-2 is Zheda Pixing. Zheda is a contraction of the name Zhejiang Daxue (University), and Pixing means picosatellite.
This message reflects my personal opinion based on open sources of information.

Offline William Graham

  • Senior Member
  • *****
  • Posts: 4203
  • Liked: 207
  • Likes Given: 87
Re: Yaogan-II launch
« Reply #10 on: 05/31/2007 10:30 PM »
Thanks

Offline William Graham

  • Senior Member
  • *****
  • Posts: 4203
  • Liked: 207
  • Likes Given: 87
RE: Yaogan-II launch
« Reply #11 on: 07/03/2007 09:16 PM »
Sounds like there could have been a seperation failure. According to http://planet4589.org/space/jsr/latest.html :



What do you guys think?

Offline enix

  • Member
  • Posts: 7
  • Liked: 0
  • Likes Given: 0
RE: Yaogan-II launch
« Reply #12 on: 07/04/2007 03:44 PM »
There are four objects detected after launch.
They should be the first and second stage of CZ-2, Yao-Gan 2 and Pixing 1.

Name:          OBJECT D  USSPACECOM Nr: 31493
International Designator: 2007-019D
Orbit:        430.9 x 454.7 km, 93.4min    Inclination: 97.2°
Age Elements:  0 days
--------------------------------------------------------------------------------
  Name:          OBJECT C  USSPACECOM Nr: 31492
International Designator: 2007-019C
Orbit:        631.1 x 655.4 km, 97.6min    Inclination: 97.8°
Age Elements:  2.3 days
--------------------------------------------------------------------------------
  Name:          OBJECT B  USSPACECOM Nr: 31491
International Designator: 2007-019B  
Orbit:        632 x 654.5 km, 97.6min    Inclination: 97.9°
Age Elements:  1.4 days
--------------------------------------------------------------------------------
  Name:          OBJECT A  USSPACECOM Nr: 31490
International Designator: 2007-019A
Orbit:        631.1 x 655.4 km, 97.6min    Inclination: 97.8°
Age Elements:  1 days

Chinese media reported that Yao-Gan 2 work well. This news was delievered in June 13.
http://www.china-spacenews.com/n435777/n435778/n435784/33806.html
(No news in English.)

I believe this satellite is fine.

Offline jcm

  • Senior Member
  • *****
  • Posts: 2973
  • Jonathan McDowell
  • Somerville, Massachusetts, USA
    • Jonathan's Space Report
  • Liked: 541
  • Likes Given: 384
RE: Yaogan-II launch
« Reply #13 on: 07/04/2007 08:54 PM »
Quote
enix - 4/7/2007  11:44 AM

There are four objects detected after launch.
They should be the first and second stage of CZ-2, Yao-Gan 2 and Pixing 1.
 

Except that a few days after launch, objects B C and D were deleted from the catalog and replaced
by FY-1C ASAT debris. Currently only YaoGan 2 is in the catalog.

I don't think there is a problem with the picosat, it's too small and could well not have been
tracked. But the lack of catalog number for the second stage is very strange.
  Jonathan
-----------------------------

Jonathan McDowell
http://planet4589.org

Offline Skyrocket

  • Extreme Veteran
  • Senior Member
  • *****
  • Posts: 2146
  • Frankfurt am Main, Germany
  • Liked: 318
  • Likes Given: 91
Re: Yaogan-II launch
« Reply #14 on: 07/04/2007 10:36 PM »
i read in some announcement, that the CZ-2D second stage used a new secondary propusion system to move the Yaogan-2 into its orbit, therefore making the 3rd stage of CZ-4B unneccessary. This system could have also provided the deorbiting of the second stage. Unfortunatly i have not bookmarked this report and can not remember the source. Perhaps someone else has read it too and has a better memory than me.


Offline Liss

  • Full Member
  • ****
  • Posts: 1031
  • Moscow, Russia
  • Liked: 196
  • Likes Given: 10
Re: Yaogan-II launch
« Reply #15 on: 07/06/2007 06:13 AM »
I think you refer to the last paragraph of  http://www.china-spacenews.com/n435777/n435778/n435783/33291.html . Yet we need a person with good understanding of Chinese to see what exactly has been made on this vehicle.
This message reflects my personal opinion based on open sources of information.

Tags: