Author Topic: SpaceX F9 : Starlink group 2-4 : VSFB SLC-4E : 19 January 2023 (15:43 UTC)  (Read 53729 times)

Online FutureSpaceTourist

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https://twitter.com/shorealonefilms/status/1616116267068567552

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Here’s @SpaceX #Falcon9 blasting off from @SLDelta30 on its #Starlink 2-4 mission this morning. Yes…thats all that was visible from #Pasadena lol 01-19-23

Online FutureSpaceTourist

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A couple of SpaceX launch photos

Offline edkyle99

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I wonder if today's launch used the second stage that had the problem during the November 17, 2022 static fire held before the planned Starlink 2-4 launch using B1061.11. 

 - Ed Kyle

Online Alexphysics

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I wonder if today's launch used the second stage that had the problem during the November 17, 2022 static fire held before the planned Starlink 2-4 launch using B1061.11. 

 - Ed Kyle

Who said the issue was on the second stage?

Offline OneSpeed

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Here is a comparison of the webcast telemetry from the Starlink 4-31 and 2-4 missions.

4-31 flew 53 satellites to an orbital inclination of 53.2°, whilst 2-4 flew 51 satellites to 70°.

Some first stage differences are:
1. The 2-4 throttle bucket was about 5 seconds earlier, from 240 to 320m/s, barely supersonic at that altitude. The 4-31 bucket was from the usual 300 to 355m/s.
2. The 2-4 MECO was 2s earlier, re-entry burn was 4s earlier, and the landing burn was 10s earlier. This all points to a slightly less energetic booster trajectory, as you might expect with fewer satellites to a higher inclination.

For the second stage, the differences are:
1. Because of the SpaceX telemetry inertial frame of reference, orbital velocity of 2-4 at 70° inclination is faster at 7661m/s than for 4-31 at 53.2° and 7,521m/s. In an orbital frame of reference, the numbers would be the same for both, at about 7,820m/s.
2. The acceleration for 2-4 is a few percent greater towards SECO due to the lighter payload.

Offline Steven Pietrobon

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Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Skyrocket

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I wonder if today's launch used the second stage that had the problem during the November 17, 2022 static fire held before the planned Starlink 2-4 launch using B1061.11. 

 - Ed Kyle

This launch did not use B1061.11. This one used a new stage, B1075, as mentioned earlier in this thread.
SpaceX confirms the new stage: https://www.spacex.com/launches/mission/?missionId=sl2-4-pl

Online ZachS09

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I wonder if today's launch used the second stage that had the problem during the November 17, 2022 static fire held before the planned Starlink 2-4 launch using B1061.11. 

 - Ed Kyle

This launch did not use B1061.11. This one used a new stage, B1075, as mentioned earlier in this thread.
SpaceX confirms the new stage: https://www.spacex.com/launches/mission/?missionId=sl2-4-pl


Ed meant the second stage only.
Liftoff for St. Jude's! Go Dragon, Go Falcon, Godspeed Inspiration4!

Offline kdhilliard

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Did anyone else notice that at stage separation part of the film (aluminized Kapton?) covering the MVac came loose?  From the second camera view you can even see the three strips of tape which had held it down!

Video link to stage separation: https://youtube.com/watch?v=bNAebzSvWt4&t=11m26s

Not an event of any consequence; just one I've never noticed before.

Online FutureSpaceTourist

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https://twitter.com/spaceoffshore/status/1616973989972434944

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Of Course I Still Love You droneship should arrive at the Port of Long Beach with B1075 (Starlink 2-4) on Sunday afternoon.

Online FutureSpaceTourist

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https://twitter.com/spaceoffshore/status/1617316133366906880

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OCISLY droneship has just arrived at Long Beach

Online GewoonLukas_

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Here’s @spacex’s #Falcon9 b1075.01 booster aboard a newly modified drone ship #OCISLY The new deck extensions seen here. 01-22-23

https://twitter.com/ShorealoneFilms/status/1617435527225167872
Lukas C. H. • Hobbyist Mission Patch Artist

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