Recent comments in /f/space

Kellymcdonald78 t1_j6bh5ms wrote

Reply to comment by Correct_Inspection25 in NASA's 'Mega Moon Rocket' aced first flight and is ready for crewed Artemis II launch by sasko12

As I said, let’s assume your numbers are correct. 16,000kg for TLI for Falcon Heavy. SLS Block I is 28,000kg TLI. That IS NOT 2-3 times the performance of Falcon Heavy. (Twice is 32,000kg which is greater than 28,000kg).

However if you’re going to start comparing what the hypothetical future SLS performance might be in 4-5 years, then expect to compare it against what the hypothetical future SpaceX performance might be in 4-5 years which will be Starship and Superheavy. Falcon Heavy likely won’t even be flying by 2027

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My_Diet_DrKelp t1_j6bgaxk wrote

Reply to My Personal Story About Challenger by MoabEngineer

Never really put it together til way after I was outta there but my elementary school mascot name was actually the Challengers. We had a big rocket as the symbol & this was actually in the 2000s rather than being around the time of the launch haha they went ~20 years after the explosion to figure that it probably wasn't the best move to have that as the name but they rationalized it as saying it was like 'scholastic challengers' lol the school changed it since I was there however

I was in high school when I finally put it together what the name actually meant & laughed over how ridiculous it was

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sault18 t1_j6bg0ug wrote

Reply to My Personal Story About Challenger by MoabEngineer

I always had this memory of my kindergarten teacher setting up a TV in the class for us to watch something. I didn't really understand what was going on at the time. However, I clearly remember the teacher suddenly turning off the TV in the middle of whatever we were watching and announcing that we were all going to the playground right away. It always struck me as weird and we never got an explanation as to what happened.

It was only years later that I learned about the challenger explosion and the date lined up perfectly for when I was in kindergarten. I watched it happen on live TV when I was very young and never even realized it for years.

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Shrike99 t1_j6bfosq wrote

Reply to comment by Correct_Inspection25 in NASA's 'Mega Moon Rocket' aced first flight and is ready for crewed Artemis II launch by sasko12

>When approached by NASA in 2018 for potential SLS replacement, they stated to NASA and press questions that the best theoretical max for Falcon Heavy disposable TLI payload is 18,000kg, but only a realistic 16,000kg to lunar orbit for a crewed vehicl

Source?

>The Mars injection is using the 6 month Holmann transfer window,

Even the lowest energy Mars transfer still needs more energy than fast TLI.

A best case Hohmann transfer during an ideal window like the 2033 window would be about 3500m/s. However, the upcoming 2024 window will be more like 4100m/s. On average it tends to be around 3900m/s, so I expect SpaceX's payload figures to be based on something like that.

By comparison, Apollo's fast TLI burns were nominally 10,400fps, or ~3170m/s. Call it 3200m/s. No matter how you cut it, the Mars transfer needs several hundred m/s more delta-v.

It seems very odd that an extra ~700m/s to get from GTO to TLI reduces payload from 26.7 tonnes to 16-18 tonnes, or a whopping 10 tonnes less, yet another ~700m/s to get to TMI results in virtually the same payload.

Even if SpaceX are using the best case Mars transfer, you'd still expect it to be a few tonnes less.

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Correct_Inspection25 t1_j6beblk wrote

Reply to comment by Kellymcdonald78 in NASA's 'Mega Moon Rocket' aced first flight and is ready for crewed Artemis II launch by sasko12

Yeah I am not talking about including what food/water/re-entry/life support systems/cargo load for 8-10 days with crew of 4 in a red dragon would be, as SpaceX never produced anything except really rough mock-ups and no test vehicle specs.

I am comparing gross SLS block performance to gross falcon heavy performance to fast TLI (not month long one way insertion). SpaceX has told publications and NASA what the TLI would be. I would say trust SpaceX over some random stack exchange or Quora post (which are the only people I can find referring to your numbers). https://arstechnica.com/science/2018/03/nasa-chief-explains-why-agency-wont-buy-a-bunch-of-falcon-heavy-rockets/amp/

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DudeWithAnAxeToGrind t1_j6be3s1 wrote

Reply to In the event of a fatal manned mission (example Artemis 2), would exploration stop in this period? by damarisu

Apollo 1. Challenger. Columbia. Soyuz 11. Soyuz 1. And the list goes on. The exploration continues.

There's memorial left on the Moon by Apollo 15 mission, to all astronauts and cosmonauts who died before 1971: https://en.wikipedia.org/wiki/List_of_spaceflight-related_accidents_and_incidents#/media/File:Fallen_Astronaut.jpg

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njoker555 OP t1_j6bdcdf wrote

Reply to 100 minutes of Comet C/2022 E3 (ZTF) from my backyard by njoker555

The clouds finally gave me a break to shoot this. This is my first real comet capture (I shot NEOWISE a few years ago but it was just a stock DSLR/lens shot).

I have a very quick timelapse at the beginning of this video covering the comet if anyone's interested: https://www.youtube.com/watch?v=-ApH5fxkWBI

You can find more of my videos at: https://youtube.com/Naztronomy

See this on Astrobin: https://www.astrobin.com/telzdd/

Equipment used:

  • Astro-Tech AT60ED with the 0.8x Reducer/Flattener on Advanced VX Mount
  • Mount controlled via Astroberry
  • ZWO ASI533MC Pro
  • Svbony 60mm guide scope with ZWO ASI120MM-Mini guide cam
  • 25x240sec with L-Pro
  • 15 darks
  • 30 flats for each session
  • 35 bias
  • I stacked the Comet in AstroPixelProcessor and stacked the stars in Siril to try and just get the stars stacked. I then made a composite in Photoshop.

Due to my exposure settings, I couldn't get rid of the comet in a star stack in APP and I couldn't get rid of the stars in Siril so I ended up combining them.

You can see a higher resolution at https://www.naztronomy.com/images/portfolio/fullscreen/Comet_c2022_e3_ztf.jpg

Happy to answer any questions! Thanks for looking!

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Kellymcdonald78 t1_j6bd8ed wrote

Reply to comment by Correct_Inspection25 in NASA's 'Mega Moon Rocket' aced first flight and is ready for crewed Artemis II launch by sasko12

SpaceX doesn’t currently publish their TLI payload so I’m not sure what you want them to “update”

Plus the SLS Block IB won’t even fly until 2027 (at the earliest) and that will be the crew version which has a lower payload of 38,000 kg to TLI. So while that version will be more than twice the payload of Falcon Heavy (using your numbers), it will be competing against Starship and Superheavy by then

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