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Astra 1N - Any News ? |
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#51 |
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Join Date: Jan 2002
Location: Scottish Borders
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Quote:
They said four orbits with burns at each apogee to circularise the GTO into GSO. So how long will each GTO orbit be? 24 hours? And what GSO orbital position will it start off in?
Also there did not seem to be any change in launcher characteristics for the change in 1N location and it seems to be up to the customer to move his satellite into the required orbital position, wherever that may be. http://www.lyngsat.com/asia.html Where 1N will be tested still seems to be a secret - it wasnt mentioned during the broadcast. Ive asked SES on their fb page with the idea if you dont ask you dont get
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#52 |
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Join Date: Jan 2002
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Quote:
What I want to know, and Analoguesat can probably tell us, is how long is it before 1N reaches it's GSO from GTO? I presume it's something like 5hrs (from snippits of info on Wikipedia)? )
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#53 |
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For anyone who missed it, there's a clip of the launch here: http://www.youtube.com/watch?v=NXW89...layer_embedded
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#54 |
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Quote:
At least a week. - the solar panels wont be deployed until day 6. The first days of flight are involved in checking the satellite telemetry to see if she made it into orbit intact with no leaks (which is what killed Eutel W3B recently - she was abandoned the day after launch due to a major onboard propellant leak
)I remember the W3B incident, wasn't that built by Thales Alenia Space? |
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#55 |
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The orbital dynamics are complicated and Im not 100% certain of it all, but as i understand it
The launch vehicle puts the satellite into an elliptical orbit which has is apogee (furthest point) out near the 36000 km mark - eg on the orbital arc. The perigee (nearest point is a few hundred km up from the Earth directly after launch. The onboard thruster on the bird are then used to raise the perigee over several days until the bird is in a circular orbit and on the Clarke Belt orbital plane. Things are slightly different with the Proton launches from Baikonur - the part of mission where the bird is attached to the rocket are much longer (9 hours or so) as the Proton does much of the work of getting the bird up to geostationary orbit. They also have to reduce the inclination of the satellite as Baikonur is at 50N near enough. |
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#56 |
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Join Date: May 2005
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Quote:
The orbital dynamics are complicated and Im not 100% certain of it all, but as i understand it
The launch vehicle puts the satellite into an elliptical orbit which has is apogee (furthest point) out near the 36000 km mark - eg on the orbital arc. The perigee (nearest point is a few hundred km up from the Earth directly after launch. The onboard thruster on the bird are then used to raise the perigee over several days until the bird is in a circular orbit and on the Clarke Belt orbital plane. Things are slightly different with the Proton launches from Baikonur - the part of mission where the bird is attached to the rocket are much longer (9 hours or so) as the Proton does much of the work of getting the bird up to geostationary orbit. They also have to reduce the inclination of the satellite as Baikonur is at 50N near enough. ![]() http://en.wikipedia.org/wiki/Geostat...transfer_orbit As you say the maths is pretty complex
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#57 |
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Sounds right on the money to me
![]() http://en.wikipedia.org/wiki/Geostat...transfer_orbit As you say the maths is pretty complex ![]() ![]() I got lost after deltaV = 2V sin deltai/2
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#58 |
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For anyone who missed it, there's a clip of the launch here: http://www.youtube.com/watch?v=NXW89...layer_embedded
Regards |
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#59 |
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Join Date: Nov 2001
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Astra 1N launch
Astra 1N launch page pictures updated:
http://www.astra2d.com/astra1n_launch.html |
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#60 |
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So is this good news for us Freesat owners?
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#61 |
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Quote:
So is this good news for us Freesat owners?
It sounds good. It still amazes me watching launches like this, very impressive (to me anyway). |
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#62 |
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Quote:
So is this good news for us Freesat owners?
As has been pointed out by Analoguesat on the satellites.co.uk forum, 1N's TP's are much more powerful at 130w EiRP than 2D which is around 29w, according to SES data. As 2D gets away with using a fairly low FEC (Forward Error Correction), it may be that with 1N's power being much stronger then even lower FEC's could be implemented which will allow for more 'baseband' bandwidth out of each transponder than the current 33.79MB using DVB-S (S2 would give much more). It's also been rumoured that the BBC may be about to move their remaining 2A TP's over to 1N too which carry BBC News, Parliament, interactive and all their radio services. This will please my relatives in the Canary Isles when I tell them! |
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#63 |
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the sky news also move to 1n ?
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#64 |
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the sky news also move to 1n ?
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#65 |
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SES have now updated their site with 1N listed amongst their fleet. Going off the text below and on their 1N section of the site, it would suggest testing is to be done at 28.2E but we'll have to wait and find out:
http://www.ses-astra.com/business/en...ra1n/index.php Following successful launch, the satellite is currently being moved to 28.2° East and will undergo testing before being made operational. ASTRA 1N will provide DTH broadcast services, notably digital and HD television. The satellite will offer coverage over Europe and will ultimately serve the German, French and Spanish markets. The satellite will first provide interim capacity at 28.2° East for the UK and Ireland before being re-located to 19.2° East. |
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#66 |
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interim capacity??????
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#67 |
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Quote:
interim capacity??????
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#68 |
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Is 1N up then?
Went away for a couple of days, and missed it.
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#69 |
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Quote:
It's also been rumoured that the BBC may be about to move their remaining 2A TP's over to 1N too which carry BBC News, Parliament, interactive and all their radio services. This will please my relatives in the Canary Isles when I tell them!
I remember when 2d was launched and Radio Two was 'lost' to expats without large dishes. After complaints, It wasn't long before it moved back. BBC News give hundreds of thousands of expats an alternative to Sky News. I'm sure the BBC will want this to remain available. |
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#70 |
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Is 1N up then?
Went away for a couple of days, and missed it. ![]() |
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#71 |
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I would think it's highly unlikely the BBC would move its news channel or key radio stations from a widebeam.
I remember when 2d was launched and Radio Two was 'lost' to expats without large dishes. After complaints, It wasn't long before it moved back. BBC News give hundreds of thousands of expats an alternative to Sky News. I'm sure the BBC will want this to remain available. |
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#72 |
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BBC News give hundreds of thousands of expats an alternative to Sky News. I'm sure the BBC will want this to remain available.
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#73 |
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I agree about the radio stations but, certainly in the case of hotels around even Europe, they invariably have BBC World rather than BBC News.
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#74 |
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It's not the case for R5L & R5SX which are on 2D. Sports rights I believe.
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#75 |
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Quote:
It's not the case for R5L & R5SX which are on 2D. Sports rights I believe.
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