101955 Bennu is a carbonaceous asteroid in the Apollo group discovered by the LINEAR Project on 11 September 1999. It is a potentially hazardous object that is listed on the Sentry Risk Table and tied for the highest cumulative rating on the Palermo Technical Impact Hazard Scale. It has a cumulative 1-in-1,800 chance of impacting Earth between 2178 and 2290 with the greatest risk being on 24 September 2182. It is named after the Bennu, the ancient Egyptian mythological bird associated with the Sun, creation, and rebirth.

101955 Bennu has a mean diameter of 490 m (1,610 ft; 0.30 mi) and has been observed extensively with the Arecibo Observatory planetary radar and the Goldstone Deep Space Network. Bennu was the target of the OSIRIS-REx mission which is intended to return its samples to Earth in 2023 for further study. On 3 December 2018, the OSIRIS-REx spacecraft arrived at Bennu after a two-year journey. It orbited the asteroid and mapped out Bennu's surface in detail, seeking potential sample collection sites. Analysis of the orbits allowed calculation of Bennu's mass and its distribution.

On 18 June 2019, NASA announced that the OSIRIS-REx spacecraft had closed in and captured an image from a distance of 600 metres (2,000 ft) from Bennu's surface. In October 2020, OSIRIS-REx successfully touched down on the surface of Bennu, collected a sample using an extendable arm, secured the sample and prepared for a return trip to Earth. On 10 May 2021, OSIRIS-REx successfully completed its departure from the Bennu asteroid while still carrying the sample of the asteroid rubble.

Astrometric observations between 1999 and 2013 have demonstrated that 101955 Bennu is influenced by the Yarkovsky effect, causing the semimajor axis of its orbit to drift on average by 284±1.5 meters/year. Analysis of the gravitational and thermal effects has given a bulk density of ρ = 1190±13 kg/m3, which is only slightly denser than water. Therefore, the predicted macroporosity is 40±10%, suggesting the interior has a rubble pile structure or even hollows. The estimated mass is (7.329±0.009)×1010 kg.

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  • ZachWilsonGOAT [he/him]
    ·
    3 years ago

    Mounting volume... NTFS signature is missing.
    FAILED
    Attempting to correct errors... NTFS signature is missing.
    FAILED
    Failed to startup volume: Invalid argument
    NTFS signature is missing.
    Trying the alternate boot sector
    The alternate bootsector is usable
    Set sector count to 1953259519 instead of 1953488895
    Rewriting the bootsector
    The boot sector has been rewritten
    ntfs_mst_post_read_fixup_warn: magic: 0xaaaaaaad size: 1024 usa_ofs: 21846 usa_count: 21845: Invalid argument
    Record 0 has no FILE magic (0xaaaaaaad)
    Failed to load $MFT: Input/output error
    Volume is corrupt. You should run chkdsk.

    i'm guessing the last time windows crashed my broken SSD also corrupted my HD? nothing to be done other than trying a fresh install of another OS and hope it works, right?

    i'm actually kind of wondering if it's actually my hard drive that's bunk and not my SSD, but that'd be odd. as i mentioned earlier i can mount the ssd and check files. at the same time i don't think Windows wouldn't load because a secondary drive is corrupt. guess i'll unplug the hard drive later and report back what happens.

    thank you so much for your help thus far! if you could PM me with a paypal or something i'd love to buy you a coffee as a thanks for the time you put into this. i really do appreciate it a lot.

    • PorkrollPosadist [he/him, they/them]
      ·
      3 years ago

      i’m guessing the last time windows crashed my broken SSD also corrupted my HD?

      I hadn't thought about this at all, but if the OS is crashing regularly and it's messing around with additional disks, this is possible. Normally the main disk is going to be doing most of the work though and a secondary disk used for storing music/games/whatever will be remain mostly idle unless you try accessing things from it. It should be doing very little writing unless you're actually doing something with it at the moment. And still, journaled filesystems are a lot more resilient than shit like FAT and ext2 we used in the 90s which would shatter like glass. I think you would still have to be particularly unlucky for this to happen.

      at the same time i don’t think Windows wouldn’t load because a secondary drive is corrupt. guess i’ll unplug the hard drive later and report back what happens.

      Right. I won't say it's impossible, but it would be very strange. Unplugging the drive and giving it a shot couldn't do any harm though.

      if you could PM me with a paypal or something i’d love to buy you a coffee as a thanks for the time you put into this.

      No need. o7