Author Topic: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020  (Read 199710 times)

Online FutureSpaceTourist

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #380 on: 08/07/2020 07:50 am »
https://twitter.com/killianphoto/status/1291615672913530884

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#SpaceX Starlink-10 launched into a thick soup of humid sky tonight from LC-39A, with 2 rideshare sats for @SpaceflightInc's customer @BlackSky_Inc. Another Falcon landing too. On to the next....

Offline olemars

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #381 on: 08/07/2020 08:13 am »
I love that these launches are so routine now. Looking forward to this booster doing its sixth launch and landing.

Online FutureSpaceTourist

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #382 on: 08/07/2020 08:50 am »
Streak shot from SpaceX website
« Last Edit: 08/07/2020 08:51 am by FutureSpaceTourist »

Offline OneSpeed

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #383 on: 08/07/2020 11:15 am »
Starlink V1.0 L4 - L8 all inserted into their coast phase at around 216km altitude. L1 - L3 however inserted at around 168km. Starlink V1.0 L9 marks a return to the earlier insertion altitude, at a slightly higher velocity, but with only 57 Starlink satellites on board.

Why? The 60 L3 satellites were deployed at an altitude of 302km, close to a circular orbit. The 57 L9 satellites were deployed at about 400km, also roughly circular, because that is the required orbit for the BlackSky rideshare satellites. Achieving this orbit required a small reduction in overall payload to 57 Starlink satellites.

As per some of the earlier missions, the L9 S2 throttled back to about 94% throttle at the 450s mark. It also burnt longer than L3 to compensate, and shut down travelling some 25m/s faster.

Online FutureSpaceTourist

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #384 on: 08/07/2020 12:40 pm »
twitter.com/blacksky_inc/status/1291714462064443396

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It takes about 3 minutes after launch to pass the Kármán Line, the boundary to #space around 62 miles above us. That requires 1.7 million pounds of heart-pounding thrust coming from the nine Stage 1 engines that are pushing 1+ million pounds of #engineering through... (cont'd)

https://twitter.com/blacksky_inc/status/1291714463834542081

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...the atmosphere. It’s one thing to understand it. It’s another thing to actually do it. Congrats to all our amazing partners at @SpaceX, @SpaceflightInc, and @LeoStellaLLC  + the incredible @BlackSky_Inc team whose efforts are taking #globalmonitoring to the next level.

Online LouScheffer

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #385 on: 08/07/2020 02:06 pm »
Starlink V1.0 L4 - L8 all inserted into their coast phase at around 216km altitude. L1 - L3 however inserted at around 168km. Starlink V1.0 L9 marks a return to the earlier insertion altitude, at a slightly higher velocity, but with only 57 Starlink satellites on board.

Why? The 60 L3 satellites were deployed at an altitude of 302km, close to a circular orbit. The 57 L9 satellites were deployed at about 400km, also roughly circular, because that is the required orbit for the BlackSky rideshare satellites. Achieving this orbit required a small reduction in overall payload to 57 Starlink satellites.

As per some of the earlier missions, the L9 S2 throttled back to about 94% throttle at the 450s mark. It also burnt longer than L3 to compensate, and shut down travelling some 25m/s faster.
Are you sure the orbit is the reason for reduction to 57 Starlinks?  The delta-V between 302 km circular and 400 km circular is about 56 m/s.  Getting rid of 2 starlinks (at 260 kg each), then adding 2 BlackSky (55 kg each) should increase second stage performance by about this amount using the usual assumptions (total payload about 15.6t, ISP=348, burnout mass=5.5t, including residuals), plus another 5 m/s from the first stage.  So if it's really for performance (and not say mechanical fit of the adapter, or slightly larger or heavier visor-sats compared to the L3 versions) then this is really on the performance edge of the F9 recoverable.

Perhaps the throttle back of S2 was for load limiting?  It kept the peak load to 3.5 Gs, where a normal Starlink launch goes to 4 Gs.

Online FutureSpaceTourist

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #386 on: 08/07/2020 02:07 pm »
https://twitter.com/spacecoast_stve/status/1291733778017157120

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We have liftoff!
Falcon 9 clears the tower, carrying 57 Starlink satellites, and 2 @BlackSky_Inc satellites - part of SpaceX's rideshare program.

This was booster B1051's 5th launch and landing. Which one will go for that 6th flight?

Edit to add:

https://twitter.com/abernnyc/status/1291729373876441089

Quote
B1051 taking the high road.

Congrats again, @SpaceX!
« Last Edit: 08/07/2020 02:19 pm by FutureSpaceTourist »

Online FutureSpaceTourist

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #387 on: 08/07/2020 02:39 pm »
https://twitter.com/jinsprucker/status/1291729064751804417

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I realized in the webcast this morning's Starlink flight means the last 2 launches from historic 39A were the Demo 2 booster (1st flight, left) and the Demo 1 booster (5th flight, right). In the 2+ months in-between, the Demo 2 booster has already flown again (ANASIS-II mission).

Offline tbellman

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #388 on: 08/07/2020 05:07 pm »
Are you sure the orbit is the reason for reduction to 57 Starlinks?

John Insprucker claimed that was the case in the launch webcast, at T+01:04:22 (or 1:21:14 into the Youtube webcast).

https://youtube.com/watch?v=KU6KogxG5BE&t=4874

Quote from: John Insprucker
... typically when we're flying Starlink, we go into an elliptical orbit after one burn and then we separate the satellites, and their ion thrusters will lift them to the final orbit.  But for the spaceflight customer with the BlackSky satellites we needed to get to a circular orbit, so they required two burns, the second which you saw just a little while ago, when we got to apogee.  That circularized the orbit, but in order to do that, that took more propellant out of the vehicle, so you couldn't carry quite as much mass, so we traded off three of the Starlinks, so we're at 57 Starlinks on the stack.

(I hope I managed to transcribe that correctly.)

(EDIT: Link to webcast, and spelling; thanks, kdhilliard.)
« Last Edit: 08/08/2020 06:15 am by tbellman »

Online FutureSpaceTourist

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #389 on: 08/07/2020 05:20 pm »
More SpaceX launch photos by Ben Cooper

Online FutureSpaceTourist

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #390 on: 08/07/2020 06:57 pm »
https://twitter.com/considercosmos/status/1291805737157627909

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Engines in flight, at night🔥🔭🚀
A closeup look at Falcon 9 with #Starlink & @BlackSky_Inc  via telescope tracking slowmo... Congrats @SpaceX @elonmusk

Watch for the flames, stay for the sounds and colors, scope crew at it again @Erdayastronaut @OPT_Telescopes @astroferg

Offline Bean Kenobi

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #391 on: 08/07/2020 08:26 pm »
Are you sure the orbit is the reason for reduction to 57 Starlinks?  The delta-V between 302 km circular and 400 km circular is about 56 m/s.  Getting rid of 2 starlinks (at 260 kg each), then adding 2 BlackSky (55 kg each)

Getting rid of 3 starlinks  ;)
« Last Edit: 08/07/2020 08:28 pm by Bean Kenobi »

Online LouScheffer

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #392 on: 08/07/2020 10:23 pm »
Are you sure the orbit is the reason for reduction to 57 Starlinks?  The delta-V between 302 km circular and 400 km circular is about 56 m/s.  Getting rid of 2 starlinks (at 260 kg each), then adding 2 BlackSky (55 kg each)
Getting rid of 3 starlinks  ;)
No, getting rid of 2 starlinks.  I was finding an estimated  performance for two fewer satellites, to show that according to my crude estimates, they could have fitted 58 Starlinks.  So I was speculating that there was some reason other than mass.  However, John Insprucker, later in the recent webcast, says that mass was indeed the reason.  He should know, so my speculation is wrong.

Online FutureSpaceTourist

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #393 on: 08/08/2020 01:42 pm »
https://twitter.com/kyle_m_photo/status/1292093479963820032

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Ms. Tree and Ms. Chief are almost back to Port Canaveral. #SpaceXFleet #SpaceX

Edit to add:

https://twitter.com/kyle_m_photo/status/1292096841681637376

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Looks like Ms. Tree fished a fairing half from the water. #SpaceXFleet #SpaceX
« Last Edit: 08/08/2020 01:55 pm by FutureSpaceTourist »

Online FutureSpaceTourist

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #394 on: 08/08/2020 02:03 pm »
https://twitter.com/kyle_m_photo/status/1292098855660642305

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Looks like Ms. Tree's fairing half is intact. #SpaceXFleet #SpaceX

Online FutureSpaceTourist

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #395 on: 08/08/2020 02:08 pm »
https://twitter.com/kyle_m_photo/status/1292099806517657601

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It looks like Ms. Chief also fished a fairing half out of the water. #SpaceXFleet #SpaceX

Edit to add:

https://twitter.com/kyle_m_photo/status/1292101940332171264

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Looks like Ms. Chief's fairing half is also intact.  #SpaceXFleet #SpaceX
« Last Edit: 08/08/2020 02:15 pm by FutureSpaceTourist »

Offline wannamoonbase

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #396 on: 08/08/2020 02:35 pm »
I freaking love that SpaceX is able to put so much payload into LEO and only expend the upper stage!

The SpaceX Navy does a lot of work to make this happen, but it sure saves a lot compared to expending everything.  SpaceX will only get more efficient from here on out.
Starship, Vulcan and Ariane 6 have all reached orbit.  New Glenn, well we are waiting!

Online FutureSpaceTourist

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #397 on: 08/08/2020 07:22 pm »
https://twitter.com/spacexfleet/status/1292177333466669056

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Of Course I Still Love You droneship and B1051.5 are tracking towards an arrival at Port Canaveral between 1pm and 3pm EDT tomorrow - subject to change.

Online FutureSpaceTourist

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #398 on: 08/09/2020 12:43 pm »
https://twitter.com/spacexfleet/status/1292437220654223360

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Update: OCISLY is slowing down to time for an arrival TOMORROW morning (Aug 10), shortly after dawn, around 7 - 8am ET.

Droneship will NOT be arriving today.

Online FutureSpaceTourist

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Re: SpaceX F9 : Starlink v1.0 L9 (Rideshare) : August 7, 2020
« Reply #399 on: 08/10/2020 05:25 am »
https://twitter.com/kyle_m_photo/status/1292600357814767617

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B1051.5 can already be seen off the coast where it will be lurking until tomorrow morning when it will enter Port Canaveral.  #SpaceXFleet #SpaceX

Tags: Starlink 
 

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