Quote from: smoliarm on 11/28/2017 11:14 amQuote from: Liss on 11/28/2017 09:55 amQuote from: MATTBLAK on 11/28/2017 09:07 amToo many problems with those Fregat and Briz upper stages in the past! Only one Fregat failed until now.May 21, 2009...Meridian No. 12L...Soyuz-2.1a/Fregat PLE LC-43/4...Molniya[HEO]...Wrong orbitDec 23, 2011...Meridian 5...Soyuz-2.1b/Fregat-M PLE LC-43/4...Molniya[FTO]...Fail to orbitAug 22, 2014...Galileo 5 & 6 (Doresa & Milena)...Soyuz-STB/Fregat-MT...Ko ELS...MEO-Gal[HEO]...Wrong orbitMay 21 2009 = human error, discrepancy in flight program data for Soyuz and FregatDec 23 2011 = third stage aborted due to pressurization failureAug 22, 2014 = Fregat control system failure
Quote from: Liss on 11/28/2017 09:55 amQuote from: MATTBLAK on 11/28/2017 09:07 amToo many problems with those Fregat and Briz upper stages in the past! Only one Fregat failed until now.May 21, 2009...Meridian No. 12L...Soyuz-2.1a/Fregat PLE LC-43/4...Molniya[HEO]...Wrong orbitDec 23, 2011...Meridian 5...Soyuz-2.1b/Fregat-M PLE LC-43/4...Molniya[FTO]...Fail to orbitAug 22, 2014...Galileo 5 & 6 (Doresa & Milena)...Soyuz-STB/Fregat-MT...Ko ELS...MEO-Gal[HEO]...Wrong orbit
Quote from: MATTBLAK on 11/28/2017 09:07 amToo many problems with those Fregat and Briz upper stages in the past! Only one Fregat failed until now.
Too many problems with those Fregat and Briz upper stages in the past!
Quote from: Liss on 11/28/2017 11:28 amMay 21 2009 = human error, discrepancy in flight program data for Soyuz and FregatDec 23 2011 = third stage aborted due to pressurization failureAug 22, 2014 = Fregat control system failure>>Aug 22, 2014 = Fregat control system failure- no, I recall there was quite different official assessment.Therefore I'm not sure your first two explanations are correct.Anyway my point was - we do NOT know for sure the root causes for those two failures.And as we don't know - we can't exclude Fregat from *the list*Also - there was Fobos-Grunt stuck in LEO. And its escape stage was *modified* Fregat.
May 21 2009 = human error, discrepancy in flight program data for Soyuz and FregatDec 23 2011 = third stage aborted due to pressurization failureAug 22, 2014 = Fregat control system failure
QuoteInterfax: A human error could have led to a wrong orientation of the Fregat upper stage during its 1st engine firing, sending the whole stack into the Atlantic: https://twitter.com/RussianSpaceWeb/status/935465312178331648
Interfax: A human error could have led to a wrong orientation of the Fregat upper stage during its 1st engine firing, sending the whole stack into the Atlantic:
Quote from: centaurinasa on 11/28/2017 10:10 amQuoteInterfax: A human error could have led to a wrong orientation of the Fregat upper stage during its 1st engine firing, sending the whole stack into the Atlantic: https://twitter.com/RussianSpaceWeb/status/935465312178331648Is it possible to determine roughly where this could have re-entered? I only ask because I've been puzzling all morning over a bright flash I saw in the sky at about 07:30-8am ish here in the North East of Scotland. I had assumed it was a meteor, but then I read this. Could the Fregat burn have been so far off as to cause a re-entry over the UK? I'm guessing not, but the timings look eerily close!
Quote from: Liss on 11/28/2017 09:55 amQuote from: MATTBLAK on 11/28/2017 09:07 amToo many problems with those Fregat and Briz upper stages in the past! Only one Fregat failed until now.Thanks for the correction - I thought there was more than one.
Previously Fregat had experienced:- Two (2) full failures (both in 2011) One of those was the one-off Fregat-SB propulsion module for Phobos-Grunt.- Two (2) partial failures (2009 and 2014)
More fireballs:https://twitter.com/destandaard/status/935431838604058625https://twitter.com/VTMNIEUWS/status/935417305592467461Thanks to J-C St-Pτ @jcstp
Quote from: Stevenzop on 11/28/2017 12:59 pmQuote from: centaurinasa on 11/28/2017 10:10 amQuoteInterfax: A human error could have led to a wrong orientation of the Fregat upper stage during its 1st engine firing, sending the whole stack into the Atlantic: https://twitter.com/RussianSpaceWeb/status/935465312178331648Is it possible to determine roughly where this could have re-entered? I only ask because I've been puzzling all morning over a bright flash I saw in the sky at about 07:30-8am ish here in the North East of Scotland. I had assumed it was a meteor, but then I read this. Could the Fregat burn have been so far off as to cause a re-entry over the UK? I'm guessing not, but the timings look eerily close!Well, not impossible when looking at the flight path
Quote from: Chris Bergin on 11/28/2017 01:54 pmMore fireballs:https://twitter.com/destandaard/status/935431838604058625https://twitter.com/VTMNIEUWS/status/935417305592467461Thanks to J-C St-Pτ @jcstpReading the newspaper article, they mention 1 to 2 seconds duration. That does not sound very much like a rocket stage re-entry, nor do the pictures look like one.I suspect it was a meteorite over Belgium around 7:10 am, unrelated to this.
My vague recollection is that Fregat does not have a uplink command link. And, I cant think of a reason to provide new commands to an upper stage during nominal flight.
Quote from: input~2 on 11/28/2017 01:36 pmQuote from: Stevenzop on 11/28/2017 12:59 pmQuote from: centaurinasa on 11/28/2017 10:10 amQuoteInterfax: A human error could have led to a wrong orientation of the Fregat upper stage during its 1st engine firing, sending the whole stack into the Atlantic: https://twitter.com/RussianSpaceWeb/status/935465312178331648Is it possible to determine roughly where this could have re-entered? I only ask because I've been puzzling all morning over a bright flash I saw in the sky at about 07:30-8am ish here in the North East of Scotland. I had assumed it was a meteor, but then I read this. Could the Fregat burn have been so far off as to cause a re-entry over the UK? I'm guessing not, but the timings look eerily close!Well, not impossible when looking at the flight path Thanks, you have a source of the flight path/trajectory ?
Quote from: Jester on 11/28/2017 02:55 pmQuote from: input~2 on 11/28/2017 01:36 pmQuote from: Stevenzop on 11/28/2017 12:59 pmQuote from: centaurinasa on 11/28/2017 10:10 amQuoteInterfax: A human error could have led to a wrong orientation of the Fregat upper stage during its 1st engine firing, sending the whole stack into the Atlantic: https://twitter.com/RussianSpaceWeb/status/935465312178331648Is it possible to determine roughly where this could have re-entered? I only ask because I've been puzzling all morning over a bright flash I saw in the sky at about 07:30-8am ish here in the North East of Scotland. I had assumed it was a meteor, but then I read this. Could the Fregat burn have been so far off as to cause a re-entry over the UK? I'm guessing not, but the timings look eerily close!Well, not impossible when looking at the flight path Thanks, you have a source of the flight path/trajectory ?this, from this article: http://www.russianspaceweb.com/meteor-m2-1.html
Quote from: Jester on 11/28/2017 02:55 pmQuote from: input~2 on 11/28/2017 01:36 pmQuote from: Stevenzop on 11/28/2017 12:59 pmQuote from: centaurinasa on 11/28/2017 10:10 amQuoteInterfax: A human error could have led to a wrong orientation of the Fregat upper stage during its 1st engine firing, sending the whole stack into the Atlantic: https://twitter.com/RussianSpaceWeb/status/935465312178331648Is it possible to determine roughly where this could have re-entered? I only ask because I've been puzzling all morning over a bright flash I saw in the sky at about 07:30-8am ish here in the North East of Scotland. I had assumed it was a meteor, but then I read this. Could the Fregat burn have been so far off as to cause a re-entry over the UK? I'm guessing not, but the timings look eerily close!Well, not impossible when looking at the flight path Thanks, you have a source of the flight path/trajectory ?I put together the flight path of Soyuz-2-1-b from the NOTAMs I reproduced earlier in this thread (2nd stage and 3rd stage)