Author Topic: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011  (Read 419736 times)

Offline knotnic

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #160 on: 11/08/2011 03:52 PM »
At http://phobos.cosmos.ru/index.php?id=618&L=2 it is said that "After 2.5 hours flight (1.7 revolutions) at this based orbit the main propulsion system will be switch on to transfer the spacecraft into the elliptical orbit (250 km x 4150...4170 km), period 2,2 hours. After 2.1 hours (1 revolutions) 2-nd engine burn will transfer the spacecraft into an interplanetary Earth-Mars trajectory." But on http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=49084 is said that "At launch, the spacecraft will be inserted into a 200-km circular orbit around Earth with an inclination of 51.8 degrees. After four hours of flight (2.8 revolutions) in this orbit, the propulsion system will be switched on to transfer the spacecraft into an elliptical orbit (230 x 11100 km, period 3.65 hours) from where it is transferred onto a trajectory to Mars."

Can someone explain which one is correct?

I think the one from the phobos.cosmos.ru page is right, at least according to the TLEs they're giving on another page on that site which they've been publicizing to get people to observe the burns.

There are 2 engine burns.  It is launched into a near-circular orbit.  The 1st burn (after 1.7 orbits) raises the apogee to 4150 km.  The 2nd burn, which occurs near perigee just about 1 orbit later, is the escape burn. 

The only place I could find the 11000 km value with a quick google search is a presentation from 2009 (http://www.jamesoberg.com/presentation.pdf).  So it's out of date.

Offline Lars_J

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #161 on: 11/08/2011 03:54 PM »
Observers are still being recruited to watch the two Fregat burns. Not all of them are on Earth. More to come.

Interesting... So ISS will be in good position(s) to view the burns?

Offline Skyrocket

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #162 on: 11/08/2011 04:15 PM »
I'm still quite confused of the name of the launch vehicle

Zenit-2SB41.1 two-stage rocket plus Fobos-Grunt satellite equals Zenit-2FG (or Zenit-2SLB, but not Zenit-3F) rocket.
Cheers for the clarification!
The idea is that '3' requires some third stage in addition to basic Zenit-2SB type vehicle. In the case of Fobos-Grunt, there is no third stage per documentation, even if Fobos-Grunt ADU propulsion unit is a clone of Fregat.

 So what is unique about this rocket that makes it a Zenit-2SB41?

That it has a different fairing (like Zenit-3F) and probably a special payload adaptor to fit the Fregat-like propulsion module.

Offline Blackstar

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #163 on: 11/08/2011 04:34 PM »
     Does the international cooperation involved - okay, it's mostly China, but you know what I mean - mean real/hi-res launch pics, or just the usual postage-stamps?

There's a lot of European involvement on instruments, so I wouldn't say it is "mostly China." Plus, the Planetary Society has an instrument onboard, so it's possible they have somebody at the launch site.

Offline Satori

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #164 on: 11/08/2011 04:35 PM »
I think the one from the phobos.cosmos.ru page is right,

Thanks knotnic!

Offline Skylab

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #165 on: 11/08/2011 04:44 PM »
Anatoly Zak has tweeted he will cover today's launch on this page:
http://www.russianspaceweb.com/phobos_grunt_launch.html

Source: http://twitter.com/#!/RussianSpaceWeb
(Please manually copy the second link, formatting seems to be an issue.)

Offline Satori

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #166 on: 11/08/2011 04:47 PM »
Live from Baikonur Cosmodrome

Offline Satori

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #167 on: 11/08/2011 04:49 PM »

Offline Satori

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #168 on: 11/08/2011 05:00 PM »

Offline Satori

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #169 on: 11/08/2011 05:04 PM »

Online Svetoslav

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #170 on: 11/08/2011 05:16 PM »
Do you want me to say a few words about the Bulgarian instrument aboard the mission?

Offline Blackstar

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #171 on: 11/08/2011 05:18 PM »
Do you want me to say a few words about the Bulgarian instrument aboard the mission?

Yes! Personal observations are always welcome.
« Last Edit: 11/08/2011 05:29 PM by Blackstar »

Offline Satori

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #172 on: 11/08/2011 05:22 PM »
Technicians removing protections at the base of the rocket.

Offline Satori

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #173 on: 11/08/2011 05:23 PM »
Do you want me to say a few words about the Bulgarian instrument aboard the mission?

That would be interesting!

Offline Satori

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #174 on: 11/08/2011 05:30 PM »

Online Svetoslav

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #175 on: 11/08/2011 05:31 PM »
Then I will be more than happy to share something...

I was glad to present the Bulgarian instrument with a fellow scientist from IKSI-BAS on the National radio! Right now I'm also working in the academy, although in a different institute... The scientist I know personally was very excited to talk to me about our participation on Phobos-Grunt. She was working on some of the most ambitious projects like the SVET greenhouse aboard Mir and she's a brilliant scientist here... A little offtopic - she told me that she was running an experiment in parallel with the Mars 500 crew - again, about greenhouses and growing plants in space. Right now I know that she has published a peer-reviewed article, but I didn't have much free time to read it. I will read it as soon as possible..

About the Bulgarian instrument Phobos-Grunt that is named Lyulin-Phobos... It's a small instrument - the same size as a pen! Our instruments dedicated to radiation science are small and cheap and that's why they are preferred in the whole world. Similar instruments flew aboard Mir and aboard the ISS. A similar version also flew aboard Chandrayaan-1 to the Moon in 2008. So here, in Bulgaria, we have a very good science group who work in the field of radiation science. I hear also they will work with Russia on the Luna-Glob project.

The instrument will measure radiation from distance 1.0 to 1.5 AUs from the Sun - this covers the distance from Earth to Mars... and it will also measure radiation in Mars orbit and on Phobos

The instrument will improve the current models about risks during possible Manned Mars missions in the future

The instrument will work together with our instruments on the International Space Station so our scientists can compare results...

I hope you understood everything I posted, I'm not a native English speaker...

Online ugordan

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #176 on: 11/08/2011 05:37 PM »
What kind of radiation, specifically? Galactic cosmic rays, etc?
« Last Edit: 11/08/2011 05:37 PM by ugordan »

Online Svetoslav

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #177 on: 11/08/2011 05:49 PM »
Greetings,

This is a short description of the instrument: http://www.meetmatt-conf.net/aogs_archive/2005/ST/58-ST-A0234.pdf ... another article about one Lylin-type instrument is presented here: http://www.ias.ac.in/currsci/feb252009/544.pdf

In short words, these instruments measure radiation from both Solar and Galactic origin. Corpuscular and electromagnetic radiantion. Charged particles and gamma rays...
« Last Edit: 11/08/2011 05:52 PM by Svetoslav »

Offline Satori

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #178 on: 11/08/2011 05:57 PM »
Is there any GRAU designation for Fobos-Grunt?

Offline Satori

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Re: LIVE: Zenit-2SB launch with Phobos-Grunt - November 8, 2011
« Reply #179 on: 11/08/2011 05:58 PM »

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