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Jonathan McDowell
@
planet4589
Somerville, MA, USA
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I'm an astronomer at the Harvard-Smithsonian Center for Astrophysics, working on Chandra and quasars, and commenting on space launches and space activities.
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۳۰٬۵۳۴
توييتها
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۲٬۹۶۷
دنبالشوندگان
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۲۶٬۹۹۵
دنبالکنندگان
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| توييتها |
| ۴ دقیقه |
@planet4589
Jonathan McDowell
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The @TeamSpaceIL Beresheet is then assigned catalog D01020 in my catalog of artificial objects in deep space (which I promise to publish later this year!)
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| ۵ دقیقه |
@planet4589
Jonathan McDowell
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Beresheet's latest perigee burn, at 1311 UTC Mar 7, reported boosted the apogee to about 270 000 km which would require about a 130 m/s burn. At around 0545 UTC Mar 8 it will pass the 146000 km altitude I used to mark deep space missions
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| Jonathan McDowell بازتوییت کرد | ||
| ۵ ساعت |
@Golans_mom
Danna Linn Barnett
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Successful #Beresheet manuever! Apogee now expected at about 270,000 km! Thruster worked for 152 sec at 15:11 Israeli time.
@jasonrdavis @planet4589
#IsraelToTheMoon
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| ۱۴ ساعت |
@planet4589
Jonathan McDowell
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One more SSO-A object identified: 2018-099B is SIRION PATHFINDER 2, an IoT relay satellite from Helios Wire and Sirion. That leaves 12 tracked objects from the launch without IDs.
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| اسفند ۱۵ |
@planet4589
Jonathan McDowell
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and with this cast!!
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| اسفند ۱۵ |
@planet4589
Jonathan McDowell
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It's not technically incorrect, just very misleading. I think it's worth making clear this is their space launch site.
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| اسفند ۱۵ |
@planet4589
Jonathan McDowell
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Possibly the best book ever!
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| اسفند ۱۵ |
@planet4589
Jonathan McDowell
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Looking forward to this! twitter.com/GoodOmensPrime…
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| اسفند ۱۵ |
@planet4589
Jonathan McDowell
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How far do you go? The worst case is that KJU is really a Skrull and the NK state is a cover for an alien invasion. I can't disprove that, although I do find it unlikely.
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| اسفند ۱۵ |
@planet4589
Jonathan McDowell
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My problem with the worst case modelling is that in the US defense world it always always slides from "If you want to be really paranoid, they *could* be doing X" to "We think they are definitely doing X" based on zero evidence. All the history here makes me think 'not X'.
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| اسفند ۱۵ |
@planet4589
Jonathan McDowell
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Seems to be true of our broader culture generally. Our collective sense of humour seems to have atrophied. But I'm glad to say I still have plenty of friends who make fun of my strongly held and clearly correct space opinions in a good way.
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| اسفند ۱۵ |
@planet4589
Jonathan McDowell
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My "clearly" was wrong here, given the info that the construction started before the summit.
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| اسفند ۱۵ |
@planet4589
Jonathan McDowell
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A little low for graveyard orbit - only 202 km above GEO so far compared to the recommended 300 km
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| اسفند ۱۵ |
@planet4589
Jonathan McDowell
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History. Different pads are designed for different rockets. We know the history of this pad.
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| Jonathan McDowell بازتوییت کرد | ||
| اسفند ۱۴ |
@donttrythis
Adam Savage
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NASA scientist jailed in Turkey gets little mention from the current administration. nbcnews.com/news/world/nas…
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| اسفند ۱۵ |
@planet4589
Jonathan McDowell
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Rocket better than 'missile' for sure, but I would prefer 'space rocket' here. I don't know as much about what the engine test stand has been used for.
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| اسفند ۱۵ |
@planet4589
Jonathan McDowell
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Apparently Mars is made of rocks. twitter.com/NASAInSight/st…
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| Jonathan McDowell بازتوییت کرد | ||
| اسفند ۱۵ |
@j3nnyt0wn
Jenny Town
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No ballistic missiles have ever been launched from the launch pad at Sohae/Tongchang-ri. It has only ever been used for satellite launches. The activity happening at Sohae now, while unfortunate, only shows construction going on, not anything that would indicate test prep.
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| اسفند ۱۵ |
@planet4589
Jonathan McDowell
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Exactly.
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| اسفند ۱۵ |
@planet4589
Jonathan McDowell
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I think it's a distraction to worry about it. The Hwasong-15 is a real ICBM and we should be very worried about that. Although not insanely worried, I also believe their program is a deterrent against US invasion, not a sign of an intention for first strike.
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