Starship Asterisk*

[float=left][youtube]https://www.youtube.com/watch?v=-3hO58HFa1M[/youtube][/float][quote=bystander post_id=290061 time=1550852453 user_id=112005]
[url=http://global.jaxa.jp/press/2019/02/20190222a.html][size=125][b][i]Hayabusa2 Latest Status, the Successful First Touchdown[/i][/b][/size][/url]
Japan Aerospace Exploration Agency | 2019 Feb 22
[quote]National Research and Development Agency Japan Aerospace Exploration Agency (JAXA) executed the asteroid explorer Hayabusa2 operation to touch down the surface of the target asteroid Ryugu for sample retrieval.

Data analysis from Hayabusa2 confirms that the sequence of operation proceeded, including shooting a projectile into the asteroid to collect its sample material. The Hayabusa2 spacecraft is in nominal state. This marks the Hayabusa2 successful touchdown on Ryugu. [/quote]
[/quote]

[url=http://global.jaxa.jp/press/2019/02/20190222a.html][size=125][b][i]Hayabusa2 Latest Status, the Successful First Touchdown[/i][/b][/size][/url]
Japan Aerospace Exploration Agency | 2019 Feb 22
[quote]
National Research and Development Agency Japan Aerospace Exploration Agency (JAXA) executed the asteroid explorer Hayabusa2 operation to touch down the surface of the target asteroid Ryugu for sample retrieval.

Data analysis from Hayabusa2 confirms that the sequence of operation proceeded, including shooting a projectile into the asteroid to collect its sample material. The Hayabusa2 spacecraft is in nominal state. This marks the Hayabusa2 successful touchdown on Ryugu. [/quote]

Thanks for clearing that up! :ssmile:

[quote=DomeLord post_id=287045 time=1541319361 user_id=144467]
[quote="E Fish" post_id=286977 time=1541077255 user_id=143902]
The definition of "minor planet" is pretty much anything that isn't a planet or a comet but is in orbit around the Sun, so yes, any asteroid, no matter the size, would be considered a minor planet. In fact, if you look up minor planet in the dictionary (at least in the one that comes up with a Google search), asteroid is the definition.
[/quote]

For a moment there I thought that this must therefore include showers of hapless minor planets burning up in our atmosphere as meteors but then of course the get-out clause would be that these are merely ex-comet dust particles & not stately minor planets.
[/quote]

Well, since we now nominally classify asteroids as bodies larger than 1 meter in diameter, and such bodies fairly commonly burn up in our atmosphere as meteors, some such objects might be called minor planets. Even in cometary debris streams there are bodies larger than a meter (and comets, themselves, are minor planets).

[quote="E Fish" post_id=286977 time=1541077255 user_id=143902]
The definition of "minor planet" is pretty much anything that isn't a planet or a comet but is in orbit around the Sun, so yes, any asteroid, no matter the size, would be considered a minor planet. In fact, if you look up minor planet in the dictionary (at least in the one that comes up with a Google search), asteroid is the definition.
[/quote]

For a moment there I thought that this must therefore include showers of hapless minor planets burning up in our atmosphere as meteors but then of course the get-out clause would be that these are merely ex-comet dust particles & not stately minor planets.

The "Credit" line on the main NASA APOD has now been shortened to just "JAXA". This was done at the request of JAXA's Public Information Officer. We apologize for the oversight. - RJN

Whenever I get lost in space; my wife tells me to "wake up!" Keeps me from becoming a minor planet! :lol2:

The definition of "minor planet" is pretty much anything that isn't a planet or a comet but is in orbit around the Sun, so yes, any asteroid, no matter the size, would be considered a minor planet. In fact, if you look up minor planet in the dictionary (at least in the one that comes up with a Google search), asteroid is the definition.

[quote=DomeLord post_id=286975 time=1541065583 user_id=144467]
A kilometre sized boulder is now a minor planet? That only makes sense to me if the asteroid belt is indeed the remnants of a 'minor planet' but isn't that too early to pass into settled science?
[/quote]

The term "minor planet" includes asteroids. So yes, Ryugu is a minor planet.

It is settled beyond reasonable doubt that the asteroid belt is not derived from the remnants of some other, larger body, although there are certainly groups of bodies in the belt that all originated from individual asteroids that broke up in collisions.

A kilometre sized boulder is now a minor planet? That only makes sense to me if the asteroid belt is indeed the remnants of a 'minor planet' but isn't that too early to pass into settled science?

[url=https://apod.nasa.gov/apod/ap181101.html] [img]https://apod.nasa.gov/apod/calendar/S_181101.jpg[/img] [size=150]Hayabusa2 Ascends from Asteroid Ryugu[/size][/url]

[b] Explanation: [/b] Will spacecraft Hayabusa2 be able to land safely on asteroid Ryugu? Since arriving in June, pictures show that the surface of kilometer-sized [url=https://en.wikipedia.org/wiki/162173_Ryugu]Ryugu[/url] is covered with [url=https://apod.nasa.gov/apod/ap180507.html]boulder[/url]s, so that finding a flat enough area for the [url=http://global.jaxa.jp/projects/sat/hayabusa2/]bus-sized spacecraft[/url] to touch down is [url=http://www.planetary.org/blogs/jason-davis/ryugu-sample-dicey.html]proving a challenge[/url]. In the [url=http://www.hayabusa2.jaxa.jp/en/topics/20181030e_TD1R3_CAMH/]featured video[/url], the shadow of [url=https://en.wikipedia.org/wiki/Japan]Japan's[/url] [url=https://en.wikipedia.org/wiki/Hayabusa2]robotic Hayabusa2[/url] can be seen on the rugged face of [url=https://apod.nasa.gov/apod/ap180822.html]Ryugu[/url] while ascending last week from a touchdown rehearsal only 20 meters over the surface. Previously, small [url=https://www.youtube.com/watch?v=aCeBkn7hjbM]frisbee[/url]-sized landers detached from Hayabusa2, made contact with the diamond-shaped [url=https://www.youtube.com/watch?v=aHvDO_fzZLs]asteroid's surface[/url], and started [url=https://apod.nasa.gov/apod/ap180924.html]hopping[/url] around. [url=http://global.jaxa.jp/article/2014/interview/vol88/]Studying Ryugu[/url] could [url=https://twitter.com/haya2e_jaxa]tell humanity[/url] not only about the [url=https://solarsystem.nasa.gov/small-bodies/asteroids/in-depth/]minor planet[/url]'s surface and interior, but about what materials were available in the early [url=https://solarsystem.nasa.gov/solar-system/our-solar-system/in-depth/]Solar System[/url] for the [url=https://en.wikipedia.org/wiki/Abiogenesis]development of life[/url]. The touchdown of the Hayabusa2 mother ship is [url=http://www.hayabusa2.jaxa.jp/en/news/schedule/]slated for[/url] early next year, hopefully followed by a soil sample collection for return to Earth.


[table][tr][td=left][url=http://asterisk.apod.com/discuss_apod.php?date=181031][b]<< Previous APOD[/b][/url][/td] [td=center][url=http://asterisk.apod.com/view_retro.php?date=1101][b]This Day in APOD[/b][/url][/td] [td=right][url=http://asterisk.apod.com/discuss_apod.php?date=181102][b]Next APOD >>[/b][/url][/td][/tr][/table]