Author Topic: Vulcan VC2S V001 - Peregrine Lander - CCSFS SLC-41 - 8 Jan 2024 (07:18 UTC)  (Read 431624 times)

Offline Apollo-phill

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Astrobotic lunar landing guide says will use X band uplink/ downlink to/from spacecraft using " contracted ground stations" but does not say which those are .

Online LouScheffer

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During TLI burn do we know for certain they will use RCS for pitch/roll/ yaw to the new spacecraft plane to HEO from the LEO
Not a Vulcan expert, but since they have 2 engines, presumably RCS is only needed for propellant settling for the LEO->HEO burn.  Once the main engines start, they have authority in roll, pitch, and yaw.

Any plane change needed is much more efficient if performed at apogee (where Peregrine would do it, not Centaur).  However, Vulcan looks like it has plenty of performance margin, so they might choose to include at least some plane change in the LEO-HEO burn.  But if so it's a large delta-V requirement, and would be performed as part of the main engine burn, not by the RCS.

Offline Apollo-phill

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Astrobotic Peregrine 1 " mission guide" on website currently says:-

"Peregrine will be utilizing NASA’s Deep Space Network (DSN)’s 34-meter dishes at Canberra, Australia; Madrid, Spain; and Goldstone, California.".

Their earlier Peregrine Lunar Lander Guide said it would use commercial stations . Maybe these will be used in subsequent Peregrine/ Griffin lunar lander missions ?

Offline FutureSpaceTourist

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https://twitter.com/astrobotic/status/1731679575095050608

Quote
(1/5) Let's take a look at the official Peregrine Mission Patch! This commemorative mission design emphasizes upwards movement, exploration, and strength. The focal point of the patch is the peregrine falcon, majestically jetting towards its lunar destination. #moon #peregrine

(2/5) Why Peregrine? Peregrine falcons are nimble and quick, clocking in at over 200mph and earning the title as fastest animal on Earth (yes, even faster than cheetahs).

(3/5) “Our Peregrine lander is aptly named to represent how our team has adapted to the many challenges and changing landscapes of the space sector,” says John Thornton, Astrobotic CEO. “This design tells our story every time it’s sewn onto a jacket or projected onto a screen.”

(4/5)  There are seven craters in the patch’s Moon design, representing the six nations (with one crater representing the world through the @DHLGlobal MoonBox program) that are joining Astrobotic on its mission.

(5/5) The phase on the patch’s Moon graphic matches the real Moon’s phase that people will see at the time of Peregrine’s touchdown. The peregrine bird imagery is a nod to NASA’s Apollo 11 patch – highlighting the historic significance of Peregrine Mission 1.

Offline AS_501

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Astrobotic Peregrine 1 " mission guide" on website currently says:-

"Peregrine will be utilizing NASA’s Deep Space Network (DSN)’s 34-meter dishes at Canberra, Australia; Madrid, Spain; and Goldstone, California.".

Their earlier Peregrine Lunar Lander Guide said it would use commercial stations . Maybe these will be used in subsequent Peregrine/ Griffin lunar lander missions ?

Thus, any Moon-bound spacecraft using the DSN must do its final TLI burn (at or near Perigee) at a sufficient altitude to be be 'visible' to one of the DSN antennas.

« Last Edit: 12/04/2023 08:44 pm by AS_501 »
Launches attended:  Apollo 11, ASTP (@KSC, not Baikonur!), STS-41G, STS-125, EFT-1, Starlink G4-24, Artemis 1
Notable Spacecraft Observed:  Echo 1, Skylab/S-II, Salyuts 6&7, Mir Core/Complete, HST, ISS Zarya/Present, Columbia, Challenger, Discovery, Atlantis, Dragon Demo-2, Starlink G4-14 (8 hrs. post-launch), Tiangong

Offline gongora

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Astrobotic Peregrine 1 " mission guide" on website currently says:-

"Peregrine will be utilizing NASA’s Deep Space Network (DSN)’s 34-meter dishes at Canberra, Australia; Madrid, Spain; and Goldstone, California.".

Their earlier Peregrine Lunar Lander Guide said it would use commercial stations . Maybe these will be used in subsequent Peregrine/ Griffin lunar lander missions ?

Thus, any Moon-bound spacecraft using the DSN must do its final TLI burn (at or near Perigee) at a sufficient altitude to be be 'visible' to one of the DSN antennas.

The use of DSN at some point during a mission says nothing about the TLI burn

Offline AS_501

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Astrobotic Peregrine 1 " mission guide" on website currently says:-

"Peregrine will be utilizing NASA’s Deep Space Network (DSN)’s 34-meter dishes at Canberra, Australia; Madrid, Spain; and Goldstone, California.".

Their earlier Peregrine Lunar Lander Guide said it would use commercial stations . Maybe these will be used in subsequent Peregrine/ Griffin lunar lander missions ?

Thus, any Moon-bound spacecraft using the DSN must do its final TLI burn (at or near Perigee) at a sufficient altitude to be be 'visible' to one of the DSN antennas.

The use of DSN at some point during a mission says nothing about the TLI burn

Then how does mission control obtain telemetry during a TLI burn, or even abort the burn?
Launches attended:  Apollo 11, ASTP (@KSC, not Baikonur!), STS-41G, STS-125, EFT-1, Starlink G4-24, Artemis 1
Notable Spacecraft Observed:  Echo 1, Skylab/S-II, Salyuts 6&7, Mir Core/Complete, HST, ISS Zarya/Present, Columbia, Challenger, Discovery, Atlantis, Dragon Demo-2, Starlink G4-14 (8 hrs. post-launch), Tiangong

Offline gongora

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The burns are happening in LEO, so however telemetry normally occurs from there.  The spacecraft also aren't doing the TLI burns on a lot of these missions, the launch vehicles are doing them.

Offline AS_501

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The burns are happening in LEO, so however telemetry normally occurs from there.  The spacecraft also aren't doing the TLI burns on a lot of these missions, the launch vehicles are doing them.

Thanks for the clarification.
Launches attended:  Apollo 11, ASTP (@KSC, not Baikonur!), STS-41G, STS-125, EFT-1, Starlink G4-24, Artemis 1
Notable Spacecraft Observed:  Echo 1, Skylab/S-II, Salyuts 6&7, Mir Core/Complete, HST, ISS Zarya/Present, Columbia, Challenger, Discovery, Atlantis, Dragon Demo-2, Starlink G4-14 (8 hrs. post-launch), Tiangong

Offline Jim

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Then how does mission control obtain telemetry during a TLI burn, or even abort the burn?
a.  There is no mission control involved Vulcan.  Just the monitoring the telemetry by engineers (not controllers)
b.  It is a Vulcan Centaur burn.  They use TDRS
c.  There is no "aborting" the burn.  Launch vehicle are autonomous and not controlled from the ground.

Offline Apollo-phill

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I think it should be clarified - from what ULA/Astrobotic have published -  that :-

ULA Vulcan launching Peregrine 1 into a High Earth Orbit ( HEO)

Peregrine 1 separates and continues on its HEO

Centaur V with other payloads ( eg Celestis et al) continues rest of its mission

Once on HEO , Peregrine 1 will raise its HEO perigee near the HEO apogee point.

Peregrine 1 rocket engines perform the  Trans Lunar Injection (TLI) burn at the HEO perigee point near the Earth to put it onto the lunar trajectory.

Peregrine 1 will perform addional "tweaking" burns during the lunar coast flight to improve accuracy.

Rest of Peregrine 1 mission flight path changes including Lunar Orbit Insertion ( LOI) , lunar orbit lowering and descent to surface carried out by its onboard rockets and RCS thrusters.




Offline gongora

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I think it should be clarified - from what ULA/Astrobotic have published -  that :-

ULA Vulcan launching Peregrine 1 into a High Earth Orbit ( HEO)

Peregrine 1 separates and continues on its HEO

Centaur V with other payloads ( eg Celestis et al) continues rest of its mission

Once on HEO , Peregrine 1 will raise its HEO perigee near the HEO apogee point.

Peregrine 1 rocket engines perform the  Trans Lunar Injection (TLI) burn at the HEO perigee point near the Earth to put it onto the lunar trajectory.

Peregrine 1 will perform addional "tweaking" burns during the lunar coast flight to improve accuracy.

Rest of Peregrine 1 mission flight path changes including Lunar Orbit Insertion ( LOI) , lunar orbit lowering and descent to surface carried out by its onboard rockets and RCS thrusters.

Centaur is doing TLI burn.  Peregrine does LOI.
« Last Edit: 12/05/2023 01:42 pm by gongora »

Offline Apollo-phill

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Not per Astrobotic.

Look at one of the flight diagrams few posts back up thread.

Centaur V puts self and Peregrine 1 and other payloads onto HEO Path.

Peregrine 1 then separates .

Then Peregrine does the burn to adjust HEO perigee height

At HEO perigee Peregrine carries out TLI burn.

Astrobotic also says they carryout TLI burn in the launch package they issued as PDF which is also referenced further up thread.




Offline gongora

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I don't know what posts you are referring to.  The flight profile a few posts back from ULA shows Centaur doing the TLI burn.  I have no idea where you're getting the part about Peregrine raising perigee before doing some TLI burn.  Why would you do that for a Lunar transfer?  FCC documentation from both ULA and Astrobotic says that ULA is doing the TLI burn.
« Last Edit: 12/05/2023 02:37 pm by gongora »

Offline Apollo-phill

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Two images showing the flight path and Astrobotic entry where they show Peregrine (having separated from Centaur) undertaking TLI and the Peregrine propulsion unit engines doing all major maneouvres including TLI.




Offline gongora

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That's not the plan for this mission.

Offline Apollo-phill

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Show us your plan with diagram or better flight plan please :)

Offline gongora

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It isn't "my" plan.  Look at the ULA diagram above.

Online DanClemmensen

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It isn't "my" plan.  Look at the ULA diagram above.
Are you referring to this? If so, how do you interpret the "Peregrine orbit at separation"?
Flight profile & groundtrack:
https://www.ulalaunch.com/missions/next-launch/vulcan-cert-1

Edit to add: The slide says this. Is that an HEO or an orbit after TLI?

Peregrine Orbit at Separation
Perigee Altitude: 494.54 km | C3: -2.06 km2/s2
Inclination 30.07 deg |Flight Azimuth 90.0 deg
« Last Edit: 12/05/2023 05:12 pm by DanClemmensen »

Online DanClemmensen

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I don't know what posts you are referring to.  The flight profile a few posts back from ULA shows Centaur doing the TLI burn.  I have no idea where you're getting the part about Peregrine raising perigee before doing some TLI burn.  Why would you do that for a Lunar transfer?  FCC documentation from both ULA and Astrobotic says that ULA is doing the TLI burn.

If you are referring to this post it is says:
Quote
Peregrine Orbit At Separation
Peregrine altitude: 494.4 km  C3 = -2.06 km^2/s^2
Inclination: 30.07 deg            Flight azimuth: 90.0 deg
So yes, the Centaur does the TLI
For those of us like me who are clueless, can you explain how you determined that this is a TLI instead of an HEO? I do not disbelieve you, I just don't know how to do the math.

 

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