Author Topic: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011  (Read 239861 times)

Offline Svetoslav

  • Veteran
  • Full Member
  • ****
  • Posts: 552
  • Liked: 2
  • Bulgaria
Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #555 on: 11/10/2011 05:55 AM »
http://www.interfax.ru/politics/txt.asp?id=216123

Interfax reports that Phobos-Grunt isn't accepting commands. They say that they can downlink telemetry, but they can't send commands...

The spacecraft is in low earth orbit, the solar batteries aren't working yet and the antenna hasn't been deployed... this is what I understand. You can check the link if you want, with Google translate (for English-speaking fans)
Svetoslav Alexandrov, B.Sc. in Molecular Biology, M.Sc. in Plant Physiology - a passionate space enthusiast

Online Chris-A

  • Member
  • Full Member
  • ****
  • Posts: 536
  • Liked: 0
Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #556 on: 11/10/2011 06:07 AM »
Looking very grim.  :(

Offline yaroslav

  • Member
  • Posts: 62
  • Liked: 0
  • Kyiv, Ukraine
Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #557 on: 11/10/2011 06:08 AM »
Thanks everyone for the updates, I was talking with a friend and we are hoping that soon controllers will be able to see something like this: http://imageshack.us/f/831/thumbsupec.jpg/  :)

Thinking about Mars

:-\
« Last Edit: 11/10/2011 06:55 AM by yaroslav »

Offline Cbased

  • Full Member
  • **
  • Posts: 277
  • Liked: 0
  • Melbourne, Australia
Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #558 on: 11/10/2011 06:20 AM »
http://www.interfax.ru/politics/txt.asp?id=216123

Interfax reports that Phobos-Grunt isn't accepting commands. They say that they can downlink telemetry, but they can't send commands...

The spacecraft is in low earth orbit, the solar batteries aren't working yet and the antenna hasn't been deployed... this is what I understand. You can check the link if you want, with Google translate (for English-speaking fans)

You have to be careful with the translation.
The first paragraph is correct. The article says that there was a one way communication - SC sending telemetry to the ground station. Then they say that in order to establish a 2-way communication and uplink the commands they need to be on the interim orbit (slower angular velocity and longer visibility periods). (To be honest - I am not sure if this is actually true - yes, the elongated orbit will increase visibility windows but regardless you should be able to control the SC on the low orbit too)

Edit: understood. Visibility period (min) * 8kbit/sec bandwidth = limited volume of data that can be transferred within the comms window.

The second paragraph (that batteries are not working, antennae are closed etc) - these are just assumptions/thoughts of one of the experts (Uvarov). This is not official in any way.

If they won't be able to reestablish control of the SC and it stays on its current orbit then the reentry will occur in 5 to 10 days.
« Last Edit: 11/10/2011 08:41 AM by Cbased »

Offline yaroslav

  • Member
  • Posts: 62
  • Liked: 0
  • Kyiv, Ukraine
Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #559 on: 11/10/2011 06:57 AM »
Looks like the main problem is to upload data to FG

Also I can't see any real info concerning FG orientation to Sun
« Last Edit: 11/10/2011 07:01 AM by yaroslav »

Offline yaroslav

  • Member
  • Posts: 62
  • Liked: 0
  • Kyiv, Ukraine
Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #560 on: 11/10/2011 07:27 AM »
more info: there were no any telemetry...

Offline yaroslav

  • Member
  • Posts: 62
  • Liked: 0
  • Kyiv, Ukraine
Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #561 on: 11/10/2011 07:32 AM »
http://interfax.ru/news.asp?id=216152
ESA will try to help to download telemetry from FG

"We shall use our stations located in Kuru and Australia"

Offline yamato

  • Member
  • Posts: 82
  • Liked: 0
Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #562 on: 11/10/2011 07:35 AM »
no telemetry? didnīt they download anything?

Offline yaroslav

  • Member
  • Posts: 62
  • Liked: 0
  • Kyiv, Ukraine
Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #563 on: 11/10/2011 07:56 AM »
looks like - nothing at all

only rumor about some "raw data", but it is only a rumor

Offline Liss

  • Full Member
  • ****
  • Posts: 613
  • Liked: 2
Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #564 on: 11/10/2011 07:58 AM »
My little advice...
Discard all reports on Fobos-Grunt unless they directly quote a named official. Just wait.

Offline yamato

  • Member
  • Posts: 82
  • Liked: 0
Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #565 on: 11/10/2011 08:06 AM »
donīt worry, I treat rumors as they deserve to :)

Offline yaroslav

  • Member
  • Posts: 62
  • Liked: 0
  • Kyiv, Ukraine
Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #566 on: 11/10/2011 08:24 AM »
My little advice...
Discard all reports on Fobos-Grunt unless they directly quote a named official. Just wait.

it is only a rumor  ;)

and  if you take a look at http://www.novosti-kosmonavtiki.ru/phpBB2/viewtopic.php?t=10631&start=3585 .....

Offline BrunoQuiocca

  • Member
  • Posts: 19
  • Liked: 0
  • Brazil
Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #567 on: 11/10/2011 08:46 AM »
Apparently (according to Vesti) there were 2 communication sessions already - late evening 9th and on the 10th of Nov at night. 2 consecutive orbits I presume?

http://www.ria.ru/science/20111110/485317739.html


Yes. One heading NE, and another about 2 to 3 hours later, heading SE.

Something like this
« Last Edit: 11/10/2011 09:04 AM by BrunoQuiocca »

Offline Liss

  • Full Member
  • ****
  • Posts: 613
  • Liked: 2
Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #568 on: 11/10/2011 09:15 AM »
Two attempts to hear from Fobos-Grunt, to be precise.

Offline Mikha

  • Member
  • Posts: 2
  • Liked: 0
Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #569 on: 11/10/2011 10:18 AM »
I can't guarantee that below is all true, but (for me personally) this guy proven to be quite reliable source of information:
http://www.novosti-kosmonavtiki.ru/phpBB2/viewtopic.php?p=832206#832206
Quote
Just a short report. [right after the launch] we've got telemetry from the 2nd stage of Zenit launcher, it shows normal separation. After the first loop the one and only [SC] telemetry session has been received, it showed deployment of the solar arrays, constant solar orientation and normal work of all systems. After the second loop we found the SC on the initial orbit, it was silent. No telemetry since that. Previous night at Baikonur there were failed attempts to restart the onboard computer. This attempts will be repeated this night.
« Last Edit: 11/10/2011 10:22 AM by Mikha »

Tags: