Author Topic: LIVE: Soyuz ST-B/ Fregat Flight VS15 - Galileo FOC FM10/11 - May 24, 2016  (Read 42663 times)

Offline Steven Pietrobon

  • Member
  • Senior Member
  • *****
  • Posts: 39218
  • Adelaide, Australia
    • Steven Pietrobon's Space Archive
  • Liked: 32738
  • Likes Given: 8196
Congratulations to Arianespace and ESA for the successful launch!
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Star One

  • Senior Member
  • *****
  • Posts: 13999
  • UK
  • Liked: 3974
  • Likes Given: 220
Congrats, Arianespace, on the successful launch of Galileo FOC-5. I'm proud of your nearly flawless record for the past fifteen flights.

I just realized that this is the last Soyuz/Galileo launch because the FOC-6, FOC-7 and FOC-8 missions will all be launched on three different Ariane 5 rockets in three years.

Why the change, surely using Ariane 5 is more costly?
« Last Edit: 05/25/2016 02:58 pm by Star One »

Offline rocx

  • Full Member
  • ***
  • Posts: 383
  • NL
  • Liked: 266
  • Likes Given: 144
Spreading risk? Making sure the satellites can be launched on multiple launch vehicles? Keeping all their vehicles supplied with payloads?
Any day with a rocket landing is a fantastic day.

Offline Nicolas PILLET

  • Member
  • Senior Member
  • *****
  • Posts: 2454
  • Gien, France
    • Kosmonavtika
  • Liked: 670
  • Likes Given: 134
« Last Edit: 05/25/2016 08:12 pm by Nicolas PILLET »
Nicolas PILLET
Kosmonavtika : The French site on Russian Space

Offline Jester

  • Administrator
  • Senior Member
  • *****
  • Posts: 7979
  • Earth
  • Liked: 6533
  • Likes Given: 157
and the 250th launch for arianspace

Offline kato

  • Member
  • Posts: 97
  • Liked: 21
  • Likes Given: 14
Why the change, surely using Ariane 5 is more costly?
The Galileo constellation is split into three separate orbital planes with different arguments of perigee*. The satellites lifted by Soyuz are all in the 0-degree equatorial plane. The Ariane launches will fill the other two planes (at 120° and 240°).

Plane changes require plenty of delta-v, which the ES restartable upper stage will provide.

The two GIOVE-A/B forerunner satellites also occupy different planes (~338° and ~215°) but were launched as single launches - and with a lower weight than Galileo - on a Soyuz-Fregat from Baikonur.

* for comparison: GLONASS and the Beidou MEO segment also each use three planes, GPS six planes.

Offline Star One

  • Senior Member
  • *****
  • Posts: 13999
  • UK
  • Liked: 3974
  • Likes Given: 220
Why the change, surely using Ariane 5 is more costly?
The Galileo constellation is split into three separate orbital planes with different arguments of perigee*. The satellites lifted by Soyuz are all in the 0-degree equatorial plane. The Ariane launches will fill the other two planes (at 120° and 240°).

Plane changes require plenty of delta-v, which the ES restartable upper stage will provide.

The two GIOVE-A/B forerunner satellites also occupy different planes (~338° and ~215°) but were launched as single launches - and with a lower weight than Galileo - on a Soyuz-Fregat from Baikonur.

* for comparison: GLONASS and the Beidou MEO segment also each use three planes, GPS six planes.

Thank you for the explanation.

Offline BabaORileyUSA

  • Member
  • Posts: 71
  • Liked: 23
  • Likes Given: 17
It hath been written:
"The Galileo constellation is split into three separate orbital planes with different arguments of perigee*. The satellites lifted by Soyuz are all in the 0-degree equatorial plane. The Ariane launches will fill the other two planes (at 120° and 240°). "

That wording is confusing.  All 3 operational planes of the Galileo constellation are inclined roughly at 56 degrees to the equator (Plane A has an inclination of 57.4 degrees, while Planes B and C are inclined at 55 degrees) and from Kourou, both the Soyuz-STB and Ariane-5 are fully capable of launching directly into the proper orbital inclination.  The 3 Planes are separated from each other by 120 degrees in Right Ascension (or longitude), not by Argument of Perigee.  Interestingly, because both Argument of Perigee and True Anomaly are poorly defined in circular orbits, the Argument of Latitude (i.e. - the sum of the Argument of Perigee and True Anomaly) is used to define Slots within an individual Plane of the constellation; Slots are distributed every 45 degrees within each of the 3 Planes (similar to GLONASS).


The reason for launching 4 payloads at a time via Ariane-5 is to fill the constellation quicker (and one European-made Ariane-5ES is probably cheaper than two Russian-made Soyuz-STBs).

Offline Rik ISS-fan

  • Full Member
  • ****
  • Posts: 1520
  • the Netherlands
  • Liked: 618
  • Likes Given: 211
Thanks BabaORileyUSA, I also wanted to write a post about it, but I couldn't have explained it as well as you did.
There are already satellites in all three orbital planes (A; B; and C). Source : gsc-europa 

Is my assumption correct that the launch profiles are nearly the same, by adjusting the launch time the satellites get into the correct plane? 
« Last Edit: 05/31/2016 03:31 pm by Rik ISS-fan »

Offline denis

  • Full Member
  • *
  • Posts: 124
  • EU
  • Liked: 24
  • Likes Given: 9
Is my assumption correct that the launch profiles are nearly the same, by adjusting the launch time the satellites get into the correct plane?

Yes, correct.
You can imagine the three orbital planes roughly fixed in inertial frame with the Earth rotating inside. You can get into one or another plane by following the same profile and launching at 8H intervals.

Offline VR2

  • Member
  • Posts: 50
  • Prague
  • Liked: 7
  • Likes Given: 0
Is someone able to find out the rocket serial numbers of VS-14 and VS-15 ?

VS14: P15000-005
VS15: P15000-011

VS14 What is the serial number of Fregat?
« Last Edit: 06/03/2016 08:20 am by VR2 »

Offline russianhalo117

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 8755
  • Liked: 4673
  • Likes Given: 768
Is someone able to find out the rocket serial numbers of VS-14 and VS-15 ?

VS14: P15000-005
VS15: P15000-011

VS14 What is the serial number of Fregat?

Im working to get verification for you of what serials actually flew:
serials:

Fairing: 15000-024
Launcher: 15000-011

when order was placed Assignment for this flight was:
                                                                      Factory                                         
Rocket                   Serial          Serial               machine series               Upper      Serial 
configuration          number       Fairing number  numbers                       stage      number
SZ19  Soyuz-ST-B  Т15000-011  81КС              21М136С                      Fregat-MT  133-05

Offline Stan Black

  • Senior Member
  • *****
  • Posts: 3135
  • Liked: 377
  • Likes Given: 228
Is someone able to find out the rocket serial numbers of VS-14 and VS-15 ?

VS14: P15000-005
VS15: P15000-011

VS14 What is the serial number of Fregat?

ГКЦ №22 / VS14
Soyuz-ST-A №Р15000-005 14М135С
81КС fairing №Р15000-029
Fregat №133-08

ГКЦ №19 / VS15
Soyuz-ST-B №Р15000-011 21М136С
81КС fairing №Р15000-024
Fregat №133-05

ГКЦ №20 / VS16
Soyuz-ST-B №012 24М136С
Fregat №133-06

ГКЦ №21
Soyuz-ST-B №013 30М136С
Fregat №133-07
« Last Edit: 06/05/2016 05:50 pm by Stan Black »

Tags:
 

Advertisement NovaTech
Advertisement Northrop Grumman
Advertisement
Advertisement Margaritaville Beach Resort South Padre Island
Advertisement Brady Kenniston
Advertisement NextSpaceflight
Advertisement Nathan Barker Photography
0